Area array detection system based on through-the-wall radar

Abstract

The utility model discloses an area array detection system based on a through-the-wall radar, which comprises a radar master controller and an antenna area array, the antenna area array comprises four transmitting antennas and six receiving antennas, the four transmitting antennas and the six receiving antennas are respectively and electrically connected with the radar master controller, the four transmitting antennas are respectively positioned at four vertexes of a rectangular surface, and the six receiving antennas are respectively positioned at the four vertexes of the rectangular surface. Two long edges of the rectangular surface are respectively provided with two receiving antennas, two short edges of the rectangular surface are respectively provided with one receiving antenna, and the distance between the transmitting antenna and the adjacent receiving antenna is equal to the distance between the adjacent receiving antennas. According to the detection system disclosed by the utility model, a step frequency system is adopted, the helical antennas are arranged in a central symmetry manner to form an area array, and the spacing of each array element is accurately calculated, so that the Nyquist sampling theorem is met, and an interference region is small enough as much as possible, thereby avoiding the influence of grating lobes on the array performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of through -wall radar research, specifically relates to a kind of surface array detection system based on through -wall radar in the field. BACKGROUND

[0002] Through -wall radar is a nondestructive detection device, can detect, locate and image to target behind building wall, is widely used in counter-terrorism struggle, disaster rescue, urban street fighting etc..Through -wall radar has unique advantages in penetration ability, resolution, high-speed transmission etc..Traditional through -wall radar channel is less, and detection performance is not satisfactory in more complex environment.In building scene detection process, detection background is more complex, and through -wall radar needs to penetrate wall shelter to complete detection and positioning to biological target in use process, which requires radar to have higher detection performance. SUMMARY

[0003] The utility model provides a kind of surface array detection system based on through -wall radar to solve the technical problem that existing through -wall radar has low detection performance in complex environment, and the detection system has high resolution and good detection performance.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A kind of surface array detection system based on through -wall radar, its improvement lies in: including radar main control and antenna surface array, the antenna surface array includes four transmitting antennas and six receiving antennas, four transmitting antennas and six receiving antennas are electrically connected with radar main control respectively, four transmitting antennas are respectively located at the four vertices of a rectangular face, there are two receiving antennas on two long sides of rectangular face respectively, there is one receiving antenna on two short sides of rectangular face respectively, the distance between transmitting antenna and its adjacent receiving antenna is equal to the distance between adjacent receiving antennas.

[0006] Further, transmitting antenna and receiving antenna are both helical antennas.

[0007] Further, the distance between two transmitting antennas on long side of rectangular face is 0.525 meters.

[0008] Further, the distance between two transmitting antennas on short side of rectangular face is 0.325 meters.

[0009] Further, the distance between transmitting antenna and its adjacent receiving antenna, the distance between adjacent receiving antennas are all 0.15 meters.

[0010] The utility model has the advantages that:

[0011] The utility model discloses a detection system, adopt the step frequency system, and the surface array is formed by the helical antenna in the central symmetry mode, and the distance between each array element is accurately calculated, both satisfy Nyquist sampling theorem, and make the interference area as small as possible as far as possible, thereby avoiding the influence of the grating lobe on the array performance, and the resolution of the antenna in the distance direction, the azimuth direction and the elevation direction is guaranteed. The detection system is placed at a fixed position outside the building wall, and the multichannel radar echo signal is acquired, and it can be seen from the radar data that the detection system can realize the detection of two stationary targets in the building and the trajectory detection of the moving target in the building. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the plane arrangement drawing of the detection system antenna surface array disclosed by the utility model embodiment 1.

[0013] Figure 2 It is the space arrangement drawing of the detection system antenna surface array disclosed by the utility model embodiment 1.

[0014] Figure 3 It is the array directional diagram of the detection system antenna surface array disclosed by the utility model embodiment 1.

[0015] Figure 4 It is the array azimuth angle of the detection system antenna surface array disclosed by the utility model embodiment 1.

[0016] Figure 5 It is the array elevation angle of the detection system antenna surface array disclosed by the utility model embodiment 1.

[0017] Figure 6 It is the data drawing after the detection system disclosed by the utility model embodiment 1 is handled to two stationary targets.

[0018] Figure 7 It is the data drawing after the detection system disclosed by the utility model embodiment 1 is handled to a single moving target. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in combination with the drawings and embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0020] Embodiment 1 discloses a kind of face array detection systems based on through-wall radar, including radar host and antenna face array, radar host controls the opening, closing and data acquisition and display of through-wall radar;The antenna face array includes four transmitting antennas T1, T2, T3, T4 and six receiving antennas R1, R2, R3, R4, R5, R6, four transmitting antennas and six receiving antennas are spiral antenna, each spiral antenna is arranged in a central symmetric manner to form a multi-transmitting and multi-receiving antenna face array array.

[0021] As Figure 1 , four transmitting antennas are respectively located at the four vertices of a rectangular face, and there are two receiving antennas on each of the two long sides of the rectangular face, and there is one receiving antenna on each of the two short sides of the rectangular face. The distance between transmitting antenna T1 and transmitting antenna T2 is 0.525 meters, the distance between transmitting antenna T1 and transmitting antenna T4 is 0.325 meters, the distance between transmitting antenna T2 and transmitting antenna T3 is 0.325 meters, and the distance between transmitting antenna T3 and transmitting antenna T4 is 0.525 meters. The spacing between T1-R1, R1-R2, T2-R3, T3-R4, R4-R5 and T4-R6 is 0.15 meters.

[0022] Four transmitting antennas and six receiving antennas are electrically connected to the radar host, the radar host has seven transmitting ports, and the serial numbers are 1-7, and the radar host has eight receiving ports, and the serial numbers are A-H. Four transmitting ports are selected from the radar host, and the serial numbers are 1 to 4, and six receiving ports are selected, and the serial numbers are A to F. The selected transmitting port 1 is electrically connected to the transmitting antenna T1, the selected transmitting port 2 is electrically connected to the transmitting antenna T2, the selected transmitting port 3 is electrically connected to the transmitting antenna T3, and the selected transmitting port 4 is electrically connected to the transmitting antenna T4. The selected receiving ports A, B, C, D, E and F are electrically connected to the receiving antennas R1, R2, R3, R4, R5 and R6 in turn.

[0023] Figure 3 is the array pattern of the antenna face array of the detection system disclosed in Embodiment 1 of the utility model; Figure 4 is the array azimuth angle of the antenna face array of the detection system disclosed in Embodiment 1 of the utility model; Figure 5 is the array elevation angle of the antenna face array of the detection system disclosed in Embodiment 1 of the utility model.

[0024] The detection system disclosed in the embodiment is used to detect the internal area of a building, and three-dimensional imaging results of stationary targets and motion trajectories of multiple targets can be obtained, and the specific steps include the following steps:

[0025] Step 1, connect the detection system well, and place it in a fixed position on the outer wall of the building;

[0026] Step 2, open the through-wall radar, detect the stationary target inside the building to obtain through-wall radar detection data;

[0027] Step 3, inside the building, a moving target walks, and moving target through-wall radar detection data is obtained;

[0028] Step 4, the through-wall radar detection data is subjected to mean cancellation processing and imaging processing, and the distance image of the stationary target and the three-dimensional imaging result and the trajectory of the moving target are obtained.

[0029] Figure 6 is the data graph after processing of two stationary targets by the detection system disclosed in embodiment 1 of the utility model; Figure 7 is the data graph after processing of a single moving target by the detection system disclosed in embodiment 1 of the utility model.

Claims

1. A through-the-wall radar based area mapping system, comprising: The radar master control and the antenna array are electrically connected, four transmitting antennas are located at four vertexes of a rectangular plane, two receiving antennas are located on each long side of the rectangular plane, and one receiving antenna is located on each short side of the rectangular plane.

2. The through-the-wall radar-based area sensor system of claim 1, wherein: The transmitting antennas and the receiving antennas are spiral antennas.

3. The through-the-wall radar-based area sensor system of claim 1, wherein: The distance between the two transmitting antennas on the long side of the rectangular plane is 0.525 meters.

4. The through-the-wall radar-based area sensor system of claim 1, wherein: The distance between the two transmitting antennas on the short side of the rectangular plane is 0.325 meters.

5. The through-the-wall radar-based area sensor system of claim 1, wherein: The distance between the transmitting antennas and the adjacent receiving antennas and the distance between the adjacent receiving antennas are both 0.15 meters.

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