阅读说明：本技术 有源和无源雷达精度分区航迹综合处理方法及设备 (Active and passive radar precision partition track comprehensive processing method and equipment ) 是由 程东升 祁伟 孙合敏 蒋伟 于 2021-03-30 设计创作，主要内容包括：本发明实施例提供了一种有源和无源雷达精度分区航迹综合处理方法及设备。所述方法包括：获取无源雷达探测空域及目标定位精度,根据目标情报质量标准及目标定位精度,构建精度分区规则；获取有源雷达的有效探测区域与无源雷达的有效探测区域的重叠区域,根据重叠区域确定非融合信息区及可融合信息区；根据精度分区规则确定非融合信息区或可融合信息区的信息处理模式。本发明实施例提供的有源和无源雷达精度分区航迹综合处理方法及设备,根据无源雷达目标定位精度对无源雷达探测空域进行区域划分,并在不同的区域内,对有源、无源雷达目标情报的综合处理进行自动管控,提高了情报处理效率,有效实现了有源、无源雷达目标情报的综合利用。(The embodiment of the invention provides a method and equipment for comprehensively processing active and passive radar precision zoning flight paths. The method comprises the following steps: acquiring a passive radar detection airspace and target positioning precision, and constructing a precision partition rule according to a target information quality standard and the target positioning precision; acquiring an overlapping area of an effective detection area of the active radar and an effective detection area of the passive radar, and determining a non-fusion information area and a fusion information area according to the overlapping area; and determining the information processing mode of the non-fusion information area or the fusion information area according to the precision partition rule. According to the active and passive radar precision zoning flight path comprehensive processing method and equipment provided by the embodiment of the invention, the passive radar detection airspace is subjected to zone division according to the passive radar target positioning precision, and the comprehensive processing of the active and passive radar target information is automatically controlled in different zones, so that the information processing efficiency is improved, and the comprehensive utilization of the active and passive radar target information is effectively realized.)

1. A method for comprehensively processing active and passive radar precision subarea tracks is characterized by comprising the following steps: acquiring a passive radar detection airspace and target positioning precision, and constructing a precision partition rule according to a target information quality standard and the target positioning precision; acquiring an overlapping area of an effective detection area of an active radar and an effective detection area of a passive radar, and determining a non-fusion information area and a fusion information area according to the overlapping area; and determining the information processing mode of the non-fusion information area or the fusion information area according to the precision partition rule.

2. The active and passive radar precision zoning track integration processing method according to claim 1, wherein the target positioning precision is characterized by a space sphere probability error, and accordingly the space sphere probability error comprises:

wherein GDOP is a space sphere probability error; x, y and z are coordinates of true values of the target in an observation coordinate system; x ', y ', z ' are the coordinates of the observed value of the target in the observed coordinate system.

3. The method of claim 2, wherein the constructing the accuracy zoning rules according to the target intelligence quality standard and the target positioning accuracy comprises: if it isTarget information obtained by the passive radar participates in the fusion processing of the target information of the active radar; if it isTarget information obtained by the passive radar is used as supplement and verification of target information of the active radar, and does not participate in fusion processing of the target information of the active radar; wherein k is kilometers and is determined according to the detection task and the target information quality standard.

4. The method for integrally processing the precision zoning tracks of the active radar and the passive radar as claimed in claim 3, wherein the step of acquiring the overlapping area of the effective detection area of the active radar and the effective detection area of the passive radar comprises the following steps:

wherein M is an overlap region; m₁An effective detection area of the active radar; m₂Is the active detection area of the passive radar.

5. The method of claim 4, wherein the determining non-fusional information area and fusional information area according to the overlap area comprises: the non-overlapping area of the active radar and the passive radar is a non-fusion information area, and the overlapping area of the active radar and the passive radar is a fusion information area.

6. The active and passive radar precision partition track comprehensive processing method according to claim 5, wherein the determining the information processing mode of the non-fusion information area or the fusion information area according to the precision partition rule comprises: in the non-fusion information area, the active or passive information of the target is directly transmitted to an information center; in the information fusion area, when the accuracy and the continuity of target detection information of the active or passive radar meet the information requirement, the target information is directly reported without any fusion processing.

7. The active and passive radar precision-zoning track synthesis processing method according to claim 5, wherein the determining the information processing mode of the fusible information zone according to the precision-zoning rule comprises: if it isPerforming data processing on active and passive target track information of the target, determining target tracks which are mutually related, and determining the authenticity of the target; if it isAnd carrying out data preprocessing, data error correction, coordinate conversion and track information correlation processing on the active and passive radar information track, and carrying out tracking filtering on the fused information.

8. The utility model provides an active and passive radar precision subregion track integrated processing device which characterized in that includes: the precision partition rule module is used for acquiring a passive radar detection airspace and target positioning precision and constructing a precision partition rule according to a target information quality standard and the target positioning precision; the information area dividing module is used for acquiring an overlapping area of an effective detection area of the active radar and an effective detection area of the passive radar, and determining a non-fusion information area and a fusion information area according to the overlapping area; and the processing module is used for determining the information processing mode of the non-fusion information area or the fusion information area according to the precision partition rule.

9. An electronic device, comprising:

at least one processor, at least one memory, and a communication interface; wherein the content of the first and second substances,

the processor, the memory and the communication interface are communicated with each other;

the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 7.

10. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 7.

Technical Field

The embodiment of the invention relates to the technical field of radar early warning technology detection, in particular to a method and equipment for comprehensively processing active and passive radar precision zoning flight paths.

Background

The passive radar realizes the detection and positioning of the target in the air by passively receiving a target radiation source signal or an external radiation source signal reflected by the target, can remotely detect the target, has the advantages of good concealment and integration of detection, identification and electronic information collection, but passively detects electromagnetic signals by the passive radar, and cannot detect various airplanes which are in radio silence and various missiles which do not radiate electromagnetic waves. The active radar actively transmits high-power electromagnetic waves and detects and positions the hollow target by receiving a target echo signal. However, due to the inherent insufficiency of a specific technical system, various active air information radars have different defects in various aspects such as LPI performance, ECCM performance, destroy resistance, stealth penetration resistance, low-altitude penetration resistance and the like. Therefore, it is an urgent technical problem to be solved in the industry to develop a comprehensive processing method and device for active and passive radar precision zoning, which can effectively overcome the above-mentioned defects in the related art.

Disclosure of Invention

Aiming at the problems in the prior art, the embodiment of the invention provides a method and equipment for comprehensively processing the active radar and passive radar precision subareas of flight paths.

In a first aspect, an embodiment of the present invention provides a method for comprehensively processing a track of an active radar and a passive radar in a precision partition, including: acquiring a passive radar detection airspace and target positioning precision, and constructing a precision partition rule according to a target information quality standard and the target positioning precision; acquiring an overlapping area of an effective detection area of an active radar and an effective detection area of a passive radar, and determining a non-fusion information area and a fusion information area according to the overlapping area; and determining the information processing mode of the non-fusion information area or the fusion information area according to the precision partition rule.

On the basis of the content of the embodiment of the method, the active and passive radar precision partition flight path comprehensive processing method provided by the embodiment of the invention is characterized in that the target positioning precision is represented by a space sphere probability error, and correspondingly, the space sphere probability error comprises the following steps:

wherein GDOP is a space sphere probability error; x, y and z are coordinates of true values of the target in an observation coordinate system; x ', y ', z ' are the coordinates of the observed value of the target in the observed coordinate system.

On the basis of the content of the embodiment of the method, the method for comprehensively processing the active radar precision zoning track and the passive radar precision zoning track provided by the embodiment of the invention constructs the precision zoning rule according to the target information quality standard and the target positioning precision, and comprises the following steps: if it isTarget information obtained by the passive radar participates in the fusion processing of the target information of the active radar; if it isTarget information obtained by the passive radar is used as supplement and verification of target information of the active radar, and does not participate in fusion processing of the target information of the active radar; wherein k is kilometers and is determined according to the detection task and the target information quality standard.

On the basis of the content of the above method embodiment, the method for comprehensively processing the active radar and passive radar precision partitioned tracks, provided by the embodiment of the present invention, includes the steps of:

wherein M is an overlap region; m₁An effective detection area of the active radar; m₂Is the active detection area of the passive radar.

On the basis of the content of the embodiment of the method, the method for comprehensively processing the active radar track and the passive radar track with the precision partitions, which is provided by the embodiment of the invention, comprises the following steps of: the non-overlapping area of the active radar and the passive radar is a non-fusion information area, and the overlapping area of the active radar and the passive radar is a fusion information area.

On the basis of the content of the above method embodiment, the method for comprehensively processing the precision-partitioned flight path of the active radar and the passive radar provided in the embodiment of the present invention, wherein the determining the information processing mode of the non-fusion information region or the fusion information region according to the precision partitioning rule, includes: in the non-fusion information area, the active or passive information of the target is directly transmitted to an information center; in the information fusion area, when the accuracy and the continuity of target detection information of the active or passive radar meet the information requirement, the target information is directly reported without any fusion processing.

On the basis of the content of the above method embodiment, the method for comprehensively processing the precision partitioned flight path of the active radar and the passive radar provided in the embodiment of the present invention, wherein the determining the information processing mode of the fusible information region according to the precision partitioning rule, includes: if it isPerforming data processing on active and passive target track information of the target, determining target tracks which are mutually related, and determining the authenticity of the target; if it isAnd carrying out data preprocessing, data error correction, coordinate conversion and track information correlation processing on the active and passive radar information track, and carrying out tracking filtering on the fused information.

In a second aspect, an embodiment of the present invention provides an active and passive radar precision zoning flight path comprehensive processing apparatus, including: the precision partition rule module is used for acquiring a passive radar detection airspace and target positioning precision and constructing a precision partition rule according to a target information quality standard and the target positioning precision; the information area dividing module is used for acquiring an overlapping area of an effective detection area of the active radar and an effective detection area of the passive radar, and determining a non-fusion information area and a fusion information area according to the overlapping area; and the processing module is used for determining the information processing mode of the non-fusion information area or the fusion information area according to the precision partition rule.

In a third aspect, an embodiment of the present invention provides an electronic device, including:

at least one processor; and

at least one memory communicatively coupled to the processor, wherein:

the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the active and passive radar precision partition track comprehensive processing method provided by any one of the various implementation modes of the first aspect.

In a fourth aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method for integrated processing of partitioned tracks for active and passive radar precision provided in any of the various implementations of the first aspect.

According to the active and passive radar precision zoning comprehensive processing method and device, the corresponding precision magnitude approximation fusion principle is established, the passive radar detection airspace can be regionally divided according to the passive radar target positioning precision, the comprehensive processing of the active and passive radar target information is automatically controlled in different regions, the information processing efficiency is improved, and the comprehensive utilization of the active and passive radar target information is effectively realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below to the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart of a method for comprehensive processing of a precision zoning flight path of active and passive radars according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an active and passive radar precision zoning flight path comprehensive processing device provided by the embodiment of the invention;

fig. 3 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a principle of fusion processing on track information of a target according to an embodiment of the present invention;

fig. 5 is a structural diagram of an active and passive radar precision zoning track integrated processing system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, technical features of various embodiments or individual embodiments provided by the present invention may be arbitrarily combined with each other to form a feasible technical solution, and such combination is not limited by the sequence of steps and/or the structural composition mode, but must be realized by a person skilled in the art, and when the technical solution combination is contradictory or cannot be realized, such a technical solution combination should not be considered to exist and is not within the protection scope of the present invention.

The target detection capability of the multi-station passive radar is closely related to the position of an aerial target and the deployment relation of receiving stations thereof. The conclusion obtained by deeply analyzing the inherent target detection capability of the passive radar and the theoretical research and practical verification results of the optimization measures developed aiming at the factors limiting the performance of the multi-station passive radar in practical application show that after the optimization is deployed on each receiving station of the multi-station passive radar, the target positioning precision of the multi-station passive radar is close to that of the active radar in the effective detection airspace and the specific direction and distance airspace, the multi-station passive radar can completely participate in the fusion processing of the information of the active radar, and the quality of the target information is improved. The basic components of the system for the active radar and passive radar precision partition track comprehensive processing can be seen in fig. 5, and effective detection airspace and precision distribution of the passive radar are determined according to specific deployment conditions; establishing a precision partition rule according to the target information requirement; and determining effective detection overlapping areas of the active radar and the passive radar according to the active radar target track information and the passive radar target track information, and dividing distribution areas of the overlapping areas according to precision partition decision information. After the track information area is analyzed and judged, the working mode is selected according to the mode control signal sent by the track information area, and the target track information comprehensive processing mode in different areas is determined. For example, a normal mode, a verification mode (target track correlation processing) and a fusion mode (track fusion processing) may be adopted to obtain the target track information. Based on the thought, the embodiment of the invention provides a comprehensive processing method for the accuracy zoning flight path of the active radar and the passive radar, and referring to fig. 1, the method comprises the following steps: acquiring a passive radar detection airspace and target positioning precision, and constructing a precision partition rule according to a target information quality standard and the target positioning precision; acquiring an overlapping area of an effective detection area of an active radar and an effective detection area of a passive radar, and determining a non-fusion information area and a fusion information area according to the overlapping area; and determining the information processing mode of the non-fusion information area or the fusion information area according to the precision partition rule.

Based on the content of the foregoing method embodiment, as an optional embodiment, in the active and passive radar precision partition track comprehensive processing method provided in the embodiment of the present invention, the target positioning precision is characterized by a space sphere probability error, and accordingly, the space sphere probability error includes:

（1）

wherein GDOP is a space sphere probability error; x, y and z are coordinates of true values of the target in an observation coordinate system; x ', y ', z ' are the coordinates of the observed value of the target in the observed coordinate system.

Specifically, according to task requirements and detection airspace characteristics, an optimal deployment scheme is determined through evaluation optimization of the target detection capability of the passive radar, and according to technical performance indexes and target detection positioning working mechanisms of the passive radar, the distribution conditions of the effective detection no-load and target positioning accuracy in the detection airspace are determined through a theoretical simulation analysis way. The target positioning accuracy is mainly characterized by the space sphere probability error accuracy (GDOP): the passive radar master station is used as an origin of an observation coordinate system, and a true value and an observed value of a target are respectively (x, y, z), (x ', y ', z ') in the observation coordinate system. The spatial positioning error is defined as the spatial sphere probability error precision (GDOP) as shown in the formula (1).

Based on the content of the above method embodiment, as an optional embodiment, the method for comprehensively processing the precision partitioned flight path of the active and passive radars provided in the embodiment of the present invention, wherein the method for constructing the precision partitioned rule according to the target information quality standard and the target positioning precision comprises: if it isTarget information obtained by the passive radar participates in the fusion processing of the target information of the active radar; if it isTarget information obtained by the passive radar is used as supplement and verification of target information of the active radar, and does not participate in fusion processing of the target information of the active radar; wherein k is kilometers and is determined according to the detection task and the target information quality standard.

Based on the content of the foregoing method embodiment, as an optional embodiment, the method for comprehensively processing the accuracy partitioned flight path of the active radar and the passive radar provided in the embodiment of the present invention, where the acquiring an overlapping area of an effective detection area of the active radar and an effective detection area of the passive radar includes:

（2）

wherein M is an overlap region; m₁An effective detection area of the active radar; m₂Is the active detection area of the passive radar.

Based on the content of the foregoing method embodiment, as an optional embodiment, the method for comprehensively processing tracks partitioned into active radar precision and passive radar precision provided in the embodiment of the present invention, where determining the non-fusible information area and the fusible information area according to the overlap area includes: the non-overlapping area of the active radar and the passive radar is a non-fusion information area, and the overlapping area of the active radar and the passive radar is a fusion information area.

Based on the content of the foregoing method embodiment, as an optional embodiment, the method for comprehensively processing the precision-partitioned track of the active and passive radars according to the embodiment of the present invention, where the determining the information processing mode of the non-fusion information region or the fusion information region according to the precision partitioning rule includes: in the non-fusion information area, the active or passive information of the target is directly transmitted to an information center; in the information fusion area, when the accuracy and the continuity of target detection information of the active or passive radar meet the information requirement, the target information is directly reported without any fusion processing.

Specifically, the normal mode is adopted in a non-fusion information area or a non-key area with low target state information quality requirement in the fusion information area. And the active and passive target track information is not subjected to any processing operation, and the track information of the target is directly used for displaying or reporting. Normally, in a non-fusion information area, the active or passive information of a target is directly transmitted to an information center; in the information fusion area, when the accuracy and the continuity of target detection information of the active or passive radar can meet the combat requirement, the target information is directly reported without any fusion processing. Generally, when operating in the normal mode, the target information is mainly the high-precision radar information.

Based on the content of the foregoing method embodiment, as an optional embodiment, the method for comprehensively processing the precision-partitioned track of the active and passive radars provided in the embodiment of the present invention, where the determining the information processing mode of the fusible information area according to the precision partitioning rule includes: if it isPerforming data processing on active and passive target track information of the target, determining target tracks which are mutually related, and determining the authenticity of the target; if it isAnd carrying out data preprocessing, data error correction, coordinate conversion and track information correlation processing on the active and passive radar information track, and carrying out tracking filtering on the fused information.

Particularly, in the region of the fusible information, when(km), an information verification processing mode is adopted. The method mainly carries out data correlation processing on active and passive target track information of the target, determines the target tracks which are correlated with each other, and realizes mutual checking of the active and passive target detection information so as to judge the authenticity of the target. Meanwhile, the target attribute information of the passive detection system can be used for listing the active radar target attribute information through the target information correlation processing.

Within the zone of fusion, whenAnd (km), adopting an information fusion processing mode. The method mainly adopts a distributed fusion processing structure to perform fusion processing on track information of a target, and as shown in figure 4, the method mainly completes data preprocessing, data error correction, coordinate conversion and track correlation processing on an active passive radar information track and then improves the accuracy and continuity of the fused information through tracking filtering processing. By integrating track information of active and passive targetsAnd processing can effectively improve the quality of target track information and the utilization rate of the information.

According to the active and passive radar precision zoning flight path comprehensive processing method provided by the embodiment of the invention, by establishing the corresponding precision magnitude approximation fusion principle, the passive radar detection airspace can be regionally divided according to the passive radar target positioning precision, and the comprehensive processing of the active and passive radar target information is automatically controlled in different regions, so that the information processing efficiency is improved, and the comprehensive utilization of the active and passive radar target information is effectively realized.

The implementation basis of the various embodiments of the present invention is realized by programmed processing performed by a device having a processor function. Therefore, in engineering practice, the technical solutions and functions thereof of the embodiments of the present invention can be packaged into various modules. Based on the actual situation, on the basis of the above embodiments, the embodiments of the present invention provide an active and passive radar precision zoning integrated processing apparatus, which is used for executing the active and passive radar precision zoning integrated processing method in the above method embodiments. Referring to fig. 2, the apparatus includes: the precision partition rule module is used for acquiring a passive radar detection airspace and target positioning precision and constructing a precision partition rule according to a target information quality standard and the target positioning precision; the information area dividing module is used for acquiring an overlapping area of an effective detection area of the active radar and an effective detection area of the passive radar, and determining a non-fusion information area and a fusion information area according to the overlapping area; and the processing module is used for determining the information processing mode of the non-fusion information area or the fusion information area according to the precision partition rule.

According to the active and passive radar precision zoning flight path comprehensive processing device provided by the embodiment of the invention, various modules in the figure 2 are adopted, and the corresponding precision magnitude approximation fusion principle is established, so that the passive radar detection airspace can be regionally divided according to the passive radar target positioning precision, and the comprehensive processing of the active and passive radar target information is automatically controlled in different regions, the information processing efficiency is improved, and the comprehensive utilization of the active and passive radar target information is effectively realized.

It should be noted that, the apparatus in the apparatus embodiment provided by the present invention may be used for implementing methods in other method embodiments provided by the present invention, except that corresponding function modules are provided, and the principle of the apparatus embodiment provided by the present invention is basically the same as that of the apparatus embodiment provided by the present invention, so long as a person skilled in the art obtains corresponding technical means by combining technical features on the basis of the apparatus embodiment described above, and obtains a technical solution formed by these technical means, on the premise of ensuring that the technical solution has practicability, the apparatus in the apparatus embodiment described above may be modified, so as to obtain a corresponding apparatus class embodiment, which is used for implementing methods in other method class embodiments. For example:

based on the content of the above device embodiment, as an optional embodiment, the active and passive radar precision partition track comprehensive processing device provided in the embodiment of the present invention further includes: a third module for ifTarget information obtained by the passive radar participates in the fusion processing of the target information of the active radar; if it isTarget information obtained by the passive radar is used as supplement and verification of target information of the active radar, and does not participate in fusion processing of the target information of the active radar; wherein k is kilometers and is determined according to the detection task and the target information quality standard.

Based on the content of the above device embodiment, as an optional embodiment, the active and passive radar precision partition track comprehensive processing device provided in the embodiment of the present invention further includes: the sixth module is used for directly transmitting the active or passive information of the target to an information center in a non-fusion information area; in the information fusion area, when the accuracy and the continuity of target detection information of the active or passive radar meet the information requirement, the target information is directly reported without any fusion processing.

Based on the content of the above device embodiment, as an optional embodiment, the active and passive radar precision partition track comprehensive processing device provided in the embodiment of the present invention further includes: a seventh module for ifPerforming data processing on active and passive target track information of the target, determining target tracks which are mutually related, and determining the authenticity of the target; if it isAnd carrying out data preprocessing, data error correction, coordinate conversion and track information correlation processing on the active and passive radar information track, and carrying out tracking filtering on the fused information.

The method of the embodiment of the invention is realized by depending on the electronic equipment, so that the related electronic equipment is necessarily introduced. To this end, an embodiment of the present invention provides an electronic apparatus, as shown in fig. 3, including: at least one processor (processor)301, a communication Interface (Communications Interface)304, at least one memory (memory)302 and a communication bus 303, wherein the at least one processor 301, the communication Interface 304 and the at least one memory 302 are configured to communicate with each other via the communication bus 303. The at least one processor 301 may invoke logic instructions in the at least one memory 302 to perform all or a portion of the steps of the methods provided by the various method embodiments described above.

Furthermore, the logic instructions in the at least one memory 302 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the method embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. Based on this recognition, each block in the flowchart or block diagrams may represent a module, a program segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In this patent, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.