阅读说明：本技术 卫星导航天线性能评估系统及方法 (Satellite navigation antenna performance evaluation system and method ) 是由 孙思扬 张钦娟 黄蕊 戴巡 杨志刚 谢江 陈磊 吴晗 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种卫星导航天线性能评估系统及方法,该系统包括：微波暗室模拟无干扰的自由空间测试环境；转台放置待测卫星导航天线；转台控制器控制转台旋转,调节待测卫星导航天线的姿态；矢量网络分析仪产生测试信号；并通过待测卫星导航天线辐射测试信号,再通过测量天线接收测试信号,或通过测量天线辐射测试信号,再通过待测卫星导航天线接收测试信号；获得不同姿态下待测卫星导航天线的右旋圆极化增益值,生成右旋圆极化增益方向图,利用累积分布函数CDF对右旋圆极化增益方向图数据进行统计分析,获得CDF曲线,将CDF曲线上预设CDF值处的右旋圆极化增益值作为卫星导航天线性能评价指标,实现对卫星导航天线性能的评估。(The invention discloses a satellite navigation antenna performance evaluation system and a method, wherein the system comprises: the microwave darkroom simulates a non-interference free space test environment; a satellite navigation antenna to be detected is placed on the rotary table; the rotary table controller controls the rotary table to rotate and adjusts the posture of the satellite navigation antenna to be measured; generating a test signal by a vector network analyzer; radiating a test signal through a satellite navigation antenna to be tested, receiving the test signal through a measurement antenna, or radiating the test signal through the measurement antenna and receiving the test signal through the satellite navigation antenna to be tested; the method comprises the steps of obtaining right-hand circularly polarized gain values of a satellite navigation antenna to be detected under different postures, generating a right-hand circularly polarized gain directional diagram, carrying out statistical analysis on data of the right-hand circularly polarized gain directional diagram by using a cumulative distribution function CDF, obtaining a CDF curve, and taking the right-hand circularly polarized gain value at the position where the CDF value is preset on the CDF curve as a satellite navigation antenna performance evaluation index to realize evaluation on the performance of the satellite navigation antenna.)

1. A system for evaluating performance of a satellite navigation antenna, comprising: the system comprises a microwave anechoic chamber, a rotary table controller, a measuring antenna, a vector network analyzer, a satellite navigation antenna to be measured and a computing device;

the microwave darkroom comprises: the system is used for simulating a non-interference free space test environment;

the rotary table is characterized in that: the satellite navigation antenna is used for placing a satellite navigation antenna to be tested;

the turntable controller: the device is used for controlling the rotation of the rotary table and adjusting the attitude of the satellite navigation antenna to be detected;

the vector network analyzer: the device comprises a test antenna, a measurement antenna, a satellite navigation antenna, a test signal generator and a control unit, wherein the test antenna is used for generating a test signal, radiating the test signal through the satellite navigation antenna to be tested and then receiving the test signal through the measurement antenna, or radiating the test signal through the measurement antenna and then receiving the test signal through the satellite navigation antenna to be tested; acquiring right-hand circularly polarized gain values of the satellite navigation antenna to be detected under different postures, and generating a right-hand circularly polarized gain directional diagram;

the calculating device is used for carrying out statistical analysis on the right-hand circularly polarized gain directional diagram by utilizing the cumulative distribution function CDF to obtain a CDF curve of the right-hand circularly polarized gain, taking a right-hand circularly polarized gain value at a position where the CDF value is preset on the CDF curve of the right-hand circularly polarized gain as a satellite navigation antenna performance evaluation index, and realizing the evaluation on the satellite navigation antenna performance based on the satellite navigation antenna performance evaluation index.

2. The satellite navigation antenna performance evaluation system of claim 1, wherein the turntable includes a fixture for securing the satellite navigation antenna under test.

3. The satellite navigation antenna performance evaluation system of claim 1, wherein the right hand circularly polarized gain pattern is a three dimensional pattern or a two dimensional pattern.

4. The satellite navigation antenna performance evaluation system of claim 1, wherein the vector network analyzer is specifically configured to: and carrying out statistical analysis on the right-hand circularly polarized gain values of all test points of the upper hemispherical space of the satellite navigation antenna to be tested to obtain a CDF curve of the right-hand circularly polarized gain.

5. The satellite navigation antenna performance evaluation system of claim 1, wherein the computing device is specifically configured to: and comparing the right-hand circularly polarized gain value at the position of the preset CDF value with a preset index limit value, and evaluating the performance of the satellite navigation antenna according to the comparison result.

6. The system of claim 1, wherein the predetermined CDF value is 80% of the corresponding probability on the CDF curve of the right-hand circular polarization gain.

7. A performance evaluation method for a satellite navigation antenna is characterized by comprising the following steps:

the microwave darkroom simulates a non-interference free space test environment;

the rotary table controller controls the rotary table to rotate and adjusts the posture of the satellite navigation antenna to be detected, wherein the satellite navigation antenna to be detected is placed on the rotary table;

the vector network analyzer generates a test signal, radiates the test signal through the satellite navigation antenna to be tested, and receives the test signal through the measurement antenna, or radiates the test signal through the measurement antenna and receives the test signal through the satellite navigation antenna to be tested; acquiring right-hand circularly polarized gain values of the satellite navigation antenna to be detected under different postures, and generating a directional diagram of the right-hand circularly polarized gain;

the calculating device carries out statistical analysis on the directional diagram of the right-hand circularly polarized gain by utilizing the cumulative distribution function CDF to obtain a CDF curve of the right-hand circularly polarized gain, and the right-hand circularly polarized gain value at the position where the CDF value is preset on the CDF curve of the right-hand circularly polarized gain is used as a satellite navigation antenna performance evaluation index to realize the evaluation on the satellite navigation antenna performance.

8. The method according to claim 7, wherein the evaluation of the performance of the satellite navigation antenna by the computing device based on the evaluation index of the performance of the satellite navigation antenna comprises:

and comparing the right-hand circularly polarized gain value at the position of the preset CDF value with a preset index limit value, and evaluating the performance of the satellite navigation antenna according to the comparison result.

9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 7 to 8 when executing the computer program.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 7 to 8.

Technical Field

The invention relates to the technical field of satellite navigation antenna evaluation, in particular to a system and a method for evaluating the performance of a satellite navigation antenna.

Background

This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

With the continuous progress of satellite navigation technology, Global Navigation Satellite System (GNSS) is rapidly developed and widely used. Many countries and regions of the world are dedicated to establishing their own independent satellite navigation positioning systems. Currently, the major global satellite navigation systems include GLONASS in russia, galileo in europe, and Compass in china, in addition to GPS in the united states. The performance of an antenna as a key component in communication and satellite navigation systems has a large impact on timing and positioning accuracy in GNSS based applications. Therefore, the method has important significance for the design and evaluation of the GNSS antenna.

For GNSS applications, the preferred pattern for the satellite receive antenna is Right Hand Circular Polarization (RHCP), with a wide main lobe beamwidth, a relatively constant gain value at elevation angles greater than 10 °, and circular symmetry with respect to the azimuth plane. The performance evaluation indexes of the satellite navigation antenna commonly used at present comprise performance indexes such as peak gain, half-power beam width, axial ratio, phase center and the like. Alternatively, the elevation angle range from 0 to 90 ° may be divided into several angle intervals in which the gain or axial ratio value of the antenna should be within certain limits and evaluated accordingly.

Although these indicators have been used as main indicators for evaluating the performance of the antenna, the overall performance of the GNSS antenna cannot be reflected to some extent. For example, the existing test indexes cannot reflect the influence of antennas with different performances on the signal-to-noise ratio or the receiving sensitivity of the whole receiving system. In addition, the indexes such as peak gain and half-power beam width cannot reflect the shape distribution of the directional diagram of the antenna to be measured, so that it is difficult to compare whether an antenna with slightly higher gain and narrower half-power beam width is better than an antenna with slightly lower gain and wider half-power beam width. For example, the conventional index deviates from the antenna pattern shape, and in some cases, when the antenna a has a gain advantage in a plurality of angle sections and the antenna B has a slightly higher gain in other angle sections, the performance of the antenna cannot be determined by the conventional index.

Disclosure of Invention

The embodiment of the invention provides a satellite navigation antenna performance evaluation system, which is used for solving the technical problem that the performance of an antenna cannot be judged by using the existing evaluation antenna performance index, and comprises the following steps: the method comprises the following steps: the system comprises a microwave anechoic chamber, a rotary table controller, a measuring antenna, a vector network analyzer, a satellite navigation antenna to be measured and a computing device;

the microwave darkroom comprises: the system is used for simulating a non-interference free space test environment;

the rotary table is characterized in that: the satellite navigation antenna is used for placing a satellite navigation antenna to be tested;

the turntable controller: the device is used for controlling the rotation of the rotary table and adjusting the attitude of the satellite navigation antenna to be detected;

the vector network analyzer: the device comprises a test antenna, a measurement antenna, a satellite navigation antenna, a test signal generator and a control unit, wherein the test antenna is used for generating a test signal, radiating the test signal through the satellite navigation antenna to be tested and then receiving the test signal through the measurement antenna, or radiating the test signal through the measurement antenna and then receiving the test signal through the satellite navigation antenna to be tested; acquiring right-hand circularly polarized gain values of the satellite navigation antenna to be detected under different postures, and generating a right-hand circularly polarized gain directional diagram;

a computing device: the device is used for carrying out statistical analysis on the right-hand circularly polarized gain directional diagram by utilizing the cumulative distribution function CDF to obtain a CDF curve of the right-hand circularly polarized gain, taking the right-hand circularly polarized gain value at the position of a CDF value preset on the CDF curve of the right-hand circularly polarized gain as a satellite navigation antenna performance evaluation index, and realizing the evaluation on the satellite navigation antenna performance based on the satellite navigation antenna performance evaluation index.

The embodiment of the invention also provides a satellite navigation antenna performance evaluation method, which is used for solving the technical problem that the performance index of the existing evaluation antenna cannot judge the performance of the antenna, and comprises the following steps:

the microwave darkroom simulates a non-interference free space test environment;

the rotary table controller controls the rotary table to rotate and adjusts the posture of the satellite navigation antenna to be detected, wherein the satellite navigation antenna to be detected is placed on the rotary table;

the vector network analyzer generates a test signal, radiates the test signal through the satellite navigation antenna to be tested, and receives the test signal through the measurement antenna, or radiates the test signal through the measurement antenna and receives the test signal through the satellite navigation antenna to be tested; acquiring right-hand circularly polarized gain values of the satellite navigation antenna to be detected under different postures, and generating a directional diagram of the right-hand circularly polarized gain;

the calculating device carries out statistical analysis on the directional diagram of the right-hand circularly polarized gain by utilizing the cumulative distribution function CDF to obtain a CDF curve of the right-hand circularly polarized gain, and the right-hand circularly polarized gain value at the position where the CDF value is preset on the CDF curve of the right-hand circularly polarized gain is used as a satellite navigation antenna performance evaluation index to realize the evaluation on the satellite navigation antenna performance.

The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the satellite navigation antenna performance evaluation method when executing the computer program.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing the above method for evaluating performance of a satellite navigation antenna is stored in the computer-readable storage medium.

In the embodiment of the invention, right-hand circularly polarized gain values of the satellite navigation antenna to be detected under different postures are obtained, a directional diagram of the right-hand circularly polarized gain is generated, a cumulative distribution function CDF is utilized to perform statistical analysis on the directional diagram of the right-hand circularly polarized gain, a CDF curve of the right-hand circularly polarized gain is obtained, the right-hand circularly polarized gain value at the position of the CDF value preset on the CDF curve of the right-hand circularly polarized gain is taken as a satellite navigation antenna performance evaluation index, and the satellite navigation antenna performance evaluation is realized.

Drawings

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

FIG. 1 is a schematic structural diagram of a system for evaluating performance of a satellite navigation antenna according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a right-hand circularly polarized gain three-dimensional directional diagram (right-hand circularly polarized gain three-dimensional directional diagrams of three different antennas are respectively shown from left to right) according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a two-dimensional directional diagram of a right-hand circularly polarized gain according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of CDF curves for right hand circularly polarized gain of three different antennas A, B, C according to one embodiment of the present invention (with the abscissa in dB and the ordinate in percent).

Fig. 5 is a flowchart of a method for evaluating performance of a satellite navigation antenna 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 more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

In many cases, CDF-based statistical methods can provide a comprehensive assessment of antenna radiation performance and reflect the impact of different performance antennas on the overall reception system. Based on this, the invention provides a satellite navigation antenna performance evaluation system, which comprises: the system comprises a microwave anechoic chamber 1, a rotary table 2, a rotary table controller (not shown in figure 1), a measuring antenna 4, a vector network analyzer (not shown in figure 1), a satellite navigation antenna 6 to be measured and a computing device (not shown in figure 1);

the microwave darkroom comprises: the system is used for simulating a non-interference free space test environment;

the rotary table is characterized in that: the satellite navigation antenna is used for placing a satellite navigation antenna to be tested;

the turntable controller: the device is used for controlling the rotation of the rotary table and adjusting the attitude of the satellite navigation antenna to be detected;

the vector network analyzer: for generating a test signal; the test signal is radiated through the satellite navigation antenna to be tested and then received through the measurement antenna, or the test signal is radiated through the measurement antenna and then received through the satellite navigation antenna to be tested; acquiring right-hand circularly polarized gain values of the satellite navigation antenna to be detected under different postures, and generating a directional diagram of the right-hand circularly polarized gain;

a computing device: the device is used for carrying out statistical analysis on the directional diagram of the right-hand circularly polarized gain by utilizing the cumulative distribution function CDF to obtain a CDF curve of the right-hand circularly polarized gain, taking the right-hand circularly polarized gain value at the position of a CDF value preset on the CDF curve of the right-hand circularly polarized gain as a satellite navigation antenna performance evaluation index, and realizing the evaluation on the satellite navigation antenna performance based on the satellite navigation antenna performance evaluation index.

The satellite navigation antenna to be measured and the measuring antenna form a channel through the vector network analyzer, the measuring antenna receives the satellite navigation antenna to be measured when the satellite navigation antenna to be measured radiates, and the satellite navigation antenna to be measured receives the satellite navigation antenna to be measured when the satellite navigation antenna to be measured radiates.

The pattern that generates right hand circularly polarized gain is a three-dimensional/two-dimensional pattern as shown in fig. 2 and 3. The CDF curve of the right hand circular polarization gain generated is shown in fig. 4.

In a traditional satellite navigation antenna test method, after a right-hand circularly polarized gain directional diagram (three-dimensional/two-dimensional) test is completed, a zenith direction right-hand circularly polarized gain value or a maximum value (single value) thereof is selected as an antenna gain index, a half-power beam width (single angle value) is selected as an antenna directional diagram index, and the antenna performance is evaluated based on the two indexes. The two indexes can only reflect the radiation characteristics of the antenna from two different dimensions respectively, and cannot comprehensively reflect the comprehensive performance of antenna gain and directional diagram spatial distribution. According to the satellite navigation antenna performance evaluation method based on CDF statistical analysis, an index is comprehensively extracted from the spatial distribution of the antenna gain value, the characteristics of the two indexes are combined into one, and the comprehensive performance of the antenna gain to be measured and the spatial distribution of a directional diagram can be comprehensively reflected.

In the embodiment of the present invention, as shown in fig. 1, the turntable includes a fixing device 21, and the fixing device is used for fixing the satellite navigation antenna to be tested.

In an embodiment of the present invention, the computing apparatus is specifically configured to: and carrying out statistical analysis on the right-hand circularly polarized gain values of all test points of the upper hemispherical space of the satellite navigation antenna to be tested to obtain a CDF curve of the right-hand circularly polarized gain.

In an embodiment of the present invention, the computing apparatus is specifically configured to: and comparing the right-hand circularly polarized gain value at the position of the preset CDF value with a preset index limit value, and evaluating the performance of the satellite navigation antenna according to the comparison result. Wherein the index limit is set according to actual conditions.

In the embodiment of the present invention, the right-hand circularly polarized gain value at the predetermined CDF value is a right-hand circularly polarized gain value at a position where the probability on the right-hand circularly polarized gain CDF curve is 80%, that is, a position of the vertical axis CDF is 80%. The value can be reflected on any specific angle of the area to be measured, and the right-hand circular polarization gain value of the antenna with the probability of 80 percent can be obtained.

The embodiment of the invention also provides a satellite navigation antenna performance evaluation method, which is described in the following embodiment. Because the principle of solving the problem of the satellite navigation antenna performance evaluation method is similar to that of a satellite navigation antenna performance evaluation system, the implementation of the satellite navigation antenna performance evaluation method can be referred to the implementation of the satellite navigation antenna performance evaluation system, and repeated parts are not repeated.

Fig. 5 is a flowchart of a method for evaluating performance of a satellite navigation antenna according to an embodiment of the present invention, as shown in fig. 5, the method includes:

s1: the microwave darkroom simulates a non-interference free space test environment;

s2: the rotary table controller controls the rotary table to rotate and adjusts the posture of the satellite navigation antenna to be detected, wherein the satellite navigation antenna to be detected is placed on the rotary table;

s3: the vector network analyzer generates a test signal, radiates the test signal through the satellite navigation antenna to be tested, and receives the test signal through the measurement antenna, or radiates the test signal through the measurement antenna and receives the test signal through the satellite navigation antenna to be tested; acquiring right-hand circularly polarized gain values of the satellite navigation antenna to be detected under different postures, and generating a directional diagram of the right-hand circularly polarized gain;

s4: the calculating device carries out statistical analysis on the directional diagram of the right-hand circularly polarized gain by utilizing the cumulative distribution function CDF to obtain a CDF curve of the right-hand circularly polarized gain, and the right-hand circularly polarized gain value at the position where the CDF value is preset on the CDF curve of the right-hand circularly polarized gain is used as a satellite navigation antenna performance evaluation index to realize the evaluation on the satellite navigation antenna performance.

The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the satellite navigation antenna performance evaluation method when executing the computer program.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing the above method for evaluating performance of a satellite navigation antenna is stored in the computer-readable storage medium.

In the embodiment of the invention, the right-hand circularly polarized gain value of the satellite navigation antenna to be measured, which is measured by the measuring antenna test point by test point, is obtained, the corresponding three-dimensional/two-dimensional directional diagram is generated, the CDF curve of the right-hand circularly polarized gain is obtained by carrying out statistical analysis on the directional diagram of the right-hand circularly polarized gain by using the cumulative distribution function CDF, and the right-hand circularly polarized gain value at the position of the CDF value preset on the CDF curve of the right-hand circularly polarized gain is used as the performance evaluation index of the satellite navigation antenna, so that the. Compared with the existing antenna performance index and test method, the evaluation method and index provided by the patent can provide comprehensive evaluation on the antenna radiation performance and reflect the influence of antennas with different performances on the performance of the whole receiving system. As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.