阅读说明：本技术 一种便携式单手持穿墙雷达目标检测装置及目标检测方法 (Portable single-hand-held through-wall radar target detection device and target detection method ) 是由 杨秀蔚 李向东 张琳 赵兴文 刘成业 葛兆斌 颜广 于 2020-03-17 设计创作，主要内容包括：本公开提出了一种便携式单手持穿墙雷达目标检测装置及目标检测方法,目标检测装置结构中设置基带板,集成数据的传输通路,大大减少了传输线的设置,同时,按照装置内部件的大小分别设置在TR组件的两侧,合理布设装置内的各个部件,实现减小体积的目的。同时基带板上集成发射通路和接收通路,可以实现提高目标信息的完整性。本公开的目标检测方法,通过结合距离向变换和多普勒向变化数据的处理,首先分析墙后是否存在人体目标,如果存在再判断目标处于运动状态或者静止状态,对于运动状态的目标,判断目标靠近雷达或者远离雷达,基于一发一收的穿墙雷达系统,对一维距离像上的不同目标均给出运动状态结果。(The utility model provides a portable one-hand wall radar target detection device and target detection method, set up the baseband board in the target detection device structure, the transmission path of integrated data has significantly reduced the setting of transmission line, simultaneously, sets up respectively in the both sides of TR subassembly according to the size of device inner part, rationally lays each part in the device, realizes the purpose that reduces the volume. Meanwhile, the transmitting access and the receiving access are integrated on the baseband board, so that the completeness of target information can be improved. According to the target detection method, by combining the distance direction transformation and the Doppler direction change data processing, whether a human body target exists behind a wall is analyzed, if the human body target exists, whether the target is in a moving state or a static state is judged, for the target in the moving state, whether the target is close to a radar or far away from the radar is judged, and based on a through-the-wall radar system with one transmitting and one receiving, moving state results are given to different targets on a one-dimensional distance image.)

1. The utility model provides a portable handheld through-wall radar target detection device which characterized by: the wireless transmission device comprises a shell, a TR component arranged in the shell, a baseband signal processing board, a battery pack and a wireless transmission module which are arranged on one side of the TR component, and a receiving and transmitting antenna which is arranged on the shell on the other side of the TR component, wherein the baseband signal processing board, the TR component and the receiving and transmitting antenna are sequentially connected, and the baseband signal processing board is connected with the wireless transmission module; the shell is externally provided with a groove area, a linear handle is arranged in the groove area, and the handle and the surface of the shell are separated by a set distance.

2. A portable, single-hand-held, through-the-wall radar target detection device of claim 1, characterized by:

the baseband signal processing board comprises a circuit board, and a signal conditioning circuit, an A/D conversion circuit, an FPGA device and a controller which are arranged on the circuit board and connected in sequence; the signal conditioning circuit is connected with the TR component to receive data, and the controller is connected with the TR component through the FPGA device to send a trigger signal of a transmitting signal;

or

The T/R component comprises a transmitting module, a receiving module and a local vibration source module; the vibration source module generates a linear sweep frequency signal, a clock signal and a trigger signal, is respectively connected with the transmitting module and the receiving module, provides a signal source for the transmitting module, the receiving module is used for receiving an echo signal, and the receiving module is electrically connected with the baseband signal processing board.

3. The portable single-hand-held through-wall radar target detection device of claim 1, further comprising a wireless communication module, wherein the wireless communication module is connected with the signal processing module, and the wireless transmission module is a 4G wireless communication module, a ZigBee wireless communication module, a WiFi wireless communication module or an L oRa wireless communication module.

4. A portable, single-hand-held, through-the-wall radar target detection device of claim 1, characterized by: the shell side face provided with the receiving and transmitting antenna is a plane, the opposite face of the side face is provided with a transverse groove and a vertical groove with set width for the middle, a handle is fixedly arranged in the vertical groove, and the transverse groove is used for providing an operation gap.

5. A portable, single-hand-held, through-the-wall radar target detection device of claim 1, characterized by: the handle can be a rubber handle, and two ends of the rubber handle can be movably arranged in the vertical grooves.

6. A portable, single-hand-held, through-the-wall radar target detection device of claim 1, characterized by: the handle both ends set up the buckle, set up the slider on the buckle, both ends set up the slide rail respectively about in the vertical recess, slider and slide rail phase-match, when the handle was pulled, the slider removed in the slide rail.

7. A target detection method of a portable single-hand-held through-wall radar target detection device is characterized by comprising the following steps:

acquiring echo data: transmitting a linear frequency modulation continuous wave signal, and receiving a reflected echo signal;

sampling echo data, performing distance Fourier transform and Doppler Fourier transform on the sampled data, and preprocessing the transformed data;

judging a moving target: accumulating the distance direction of the preprocessed data to obtain the signal amplitude on the distance unit, setting a second self-adaptive threshold value T2 as the average value of the accumulated values of the signal amplitudes on all the distance units, wherein if the signal amplitudes on the distance units have a set number of continuous data points which are greater than a threshold value T2, a moving human body target exists, executing, and carrying out the next step; otherwise, outputting a detection result if no moving human body target exists;

judging the moving direction of the moving object: judging the position of the moving target to obtain a distance wave gate with the moving target; extracting the position of the maximum value of the range data in the range gate with the moving target, and if the frequency of the Doppler data corresponding to the position data of the maximum value is positive, judging that the target moves away from the radar direction; otherwise, the target is judged to move close to the radar direction.

8. The object detection method of the portable single-hand-held through-wall radar object detection device as claimed in claim 7, wherein: after judging that no moving human body target exists, judging whether a static target exists or not, comprising the following steps:

selecting Doppler direction data of a Doppler frequency range when a human body is static as a first interception data set for the preprocessed data;

accumulating the first intercepted data set on each distance unit in a distance direction to obtain a signal amplitude accumulated value on each distance unit;

setting a first adaptive threshold T1 as an average value of signal amplitude accumulated values on all distance units of a first capturing data set, setting a first number threshold X, and if the signal amplitude accumulated values on at least X continuous distance units are greater than a threshold T1, a static human body target exists; otherwise, no static target exists in the detected area.

9. The object detection method of the portable single-hand-held through-wall radar object detection device as claimed in claim 7, wherein: the method for judging the position of the moving target to obtain the range gate with the moving target specifically comprises the following steps:

carrying out equidistant gate division on the preprocessed data in the distance direction;

calculating the average value Di' of the distance direction data of the data in each distance wave gate;

calculating the total average value A 'of the distance data of all the preprocessed data, and calculating the threshold T2 of each wave gate according to the total average value A' and the distance value of the central position of the wave gate_Di；

If the mean Di' of the range data within a range gate is greater than the threshold T2 for that range gate_DiIf so, a moving target is arranged in the range wave gate; otherwise, no moving object exists in the range gate.

10. The object detection method of the portable single-hand-held through-wall radar object detection device as claimed in claim 7, wherein: the frequency of the Doppler direction data corresponding to the position data with the maximum value is positive, namely, the frequency is located in the range of (0, fs/2), the frequency of the Doppler direction data corresponding to the position data with the maximum value is negative, namely, the frequency is located in the range of (-fs/2, 0), and fs is sampling frequency.

Technical Field

The disclosure relates to the technical field related to a through-wall radar technology, in particular to a portable single-hand-held through-wall radar target detection device and a target detection method.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The through-wall radar based on the microwave technology has the capability of realizing perspective detection of a hidden target partition wall in a complex closed building environment, and has important application value in military and public safety fields of military road warfare, jungle search and catch, public security anti-terrorism, hostage rescue, disaster search and rescue and the like. Although many penetration positioning technologies exist, the through-wall radar system has a remarkable advantage in the case of surrounding complex environments (such as buildings and building shelters). Compared with penetration technologies such as a computer vision system, an infrared thermal imager and the like, the through-wall radar is not influenced by factors such as vision conditions, environmental temperature changes and weather changes, and has good penetration capacity and target resolution capacity.

The research direction of the existing through-wall radar focuses on target tracking imaging, particularly the field of high-resolution imaging, so that the requirements on the performance of system hardware are high, the complexity of the system is increased, and the volume is large. Aiming at the characteristic that the through-wall radar is mainly applied to emergency, a miniaturized, portable and quick-response through-wall radar system also becomes a research hotspot in recent years.

In 1996, through-wall radar detection was developed in the uk, of which Cambridge constultants, representative, and earlier in the development of handheld through-wall devices, mainly studied the trajectory information of moving objects in a closed room after the detection of a wall by a handheld device, whose classical product was prism 200. The product can well identify whether targets in a room exist or not, the center frequency of the product is 1.9GHz, the bandwidth is 600MHz, the distance resolution is high and can reach 35cm, a detection angle close to 120 degrees is provided, 20m can be detected at the farthest, the estimation on the existence of people is accurate, the size of the product is large, the weight is heavy, the portable flexible measurement is not facilitated, and the measurement result is single and only has distance information. Miniaturization leads to simplification of a hardware system, and thus, the acquired target information is incomplete, so that it is imperative to increase the amount of target motion information based on the miniaturization requirement.

Disclosure of Invention

In order to solve the problems, the disclosure provides a portable single-hand-held through-wall radar target detection device and a target detection method, which have multi-target identification and target motion state identification functions on the basis of miniaturization, and have higher practical value and reference value.

In order to achieve the purpose, the following technical scheme is adopted in the disclosure:

one or more embodiments provide a portable single-hand-held through-wall radar target detection device, which comprises a shell, a TR component arranged in the shell, a baseband signal processing board, a battery pack and a wireless transmission module which are arranged on one side of the TR component, and a transceiving antenna arranged on the shell on the other side of the TR component, wherein the baseband signal processing board, the TR component and the transceiving antenna are sequentially connected, and the baseband signal processing board is connected with the wireless transmission module; the shell is externally provided with a groove area, a linear handle is arranged in the groove area, and the handle and the surface of the shell are separated by a set distance.

One or more embodiments provide a target detection method of a portable single-hand-held through-wall radar target detection device, which includes the following steps:

acquiring echo data: transmitting a linear frequency modulation continuous wave signal, and receiving a reflected echo signal;

sampling echo data, performing distance Fourier transform and Doppler Fourier transform on the sampled data, and preprocessing the transformed data;

judging a moving target: accumulating the distance direction of the preprocessed data to obtain the signal amplitude on the distance unit, setting a second self-adaptive threshold value T2 as the average value of the accumulated values of the signal amplitudes on all the distance units, wherein if the signal amplitudes on the distance units have a set number of continuous data points which are greater than a threshold value T2, a moving human body target exists, executing, and carrying out the next step; otherwise, outputting a detection result if no moving human body target exists;

judging the moving direction of the moving object: judging the position of the moving target to obtain a distance wave gate with the moving target; extracting the position of the maximum value of the range data in the range gate with the moving target, and if the frequency of the Doppler data corresponding to the position data of the maximum value is positive, judging that the target moves away from the radar direction; otherwise, the target is judged to move close to the radar direction.

Compared with the prior art, the beneficial effect of this disclosure is:

(1) the base band plate is arranged in the structure of the device, the transmission path of data is integrated, the number of transmission lines is greatly reduced, meanwhile, the components in the device are reasonably arranged on two sides of the TR component according to the sizes of the components in the device, and the purpose of reducing the size is achieved. Meanwhile, the transmitting access and the receiving access are integrated on the baseband board, so that the completeness of target information can be improved.

(2) The target detection method disclosed by the invention relates to the detection of a target hidden behind a wall by an ultra-wideband through-wall radar under a limited distance. By combining the processing of the distance direction transformation and Doppler direction change data, whether a human body target exists behind a wall is analyzed, if the human body target exists, the target is judged to be in a moving state or a static state, for the target in the moving state, the target is judged to be close to a radar or far away from the radar, and a moving state result is given to different targets on a one-dimensional range profile. The through-wall radar system based on the transmitting-receiving has the characteristics of small volume, simple structure and high execution efficiency, and has the functions of distinguishing static targets and moving targets and judging the moving direction of the targets.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure.

Fig. 1 is a block diagram of the structure of an apparatus according to embodiment 1 of the present disclosure;

FIG. 2 is a front view of the device structure of example 1 of the present disclosure;

FIG. 3 is a back side view of the device structure of example 1 of the present disclosure;

FIG. 4 is a side view of the device structure of example 1 of the present disclosure;

fig. 5 is a block diagram of a baseband signal processing board according to embodiment 1 of the present disclosure;

FIG. 6 is a block diagram of the T/R component of embodiment 1 of the present disclosure;

FIG. 7 is a block diagram of the structure of the transmitting module of the T/R component of embodiment 1 of the present disclosure;

FIG. 8 is a block diagram of a receiving module of the T/R component in embodiment 1 of the disclosure;

FIG. 9 is a flowchart of a method of embodiment 2 of the disclosure;

FIG. 10 is a comparison of example measured data of example 2 of the present disclosure with a threshold T1;

fig. 11 is a schematic diagram of the example of embodiment 2 of the present disclosure performing a wave gate division on data after preprocessing;

fig. 12 is a first recognition result diagram of an example of embodiment 2 of the present disclosure;

fig. 13 is a second recognition result diagram of an example of embodiment 2 of the present disclosure;

wherein: 1. casing, 2, handle, 3, vertical recess, 4, switch, 5, reference column.

The specific implementation mode is as follows:

the present disclosure is further described with reference to the following drawings and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present disclosure may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.