WO2022267971A1

WO2022267971A1 - Three-dimensional through-wall radar system

Info

Publication number: WO2022267971A1
Application number: PCT/CN2022/099115
Authority: WO
Inventors: 杨上元; 王生水; 宋千; 贺玉贵
Original assignee: 湖南华诺星空电子技术有限公司
Priority date: 2021-06-22
Filing date: 2022-06-16
Publication date: 2022-12-29
Also published as: CN113253263A; CN113253263B

Abstract

Disclosed in the present invention is a three-dimensional through-wall radar system, comprising a frequency source (11), a transmitter (12), transmitting antennas (5), receiving antennas (4), a receiver (13), a signal processing board (2) and a power supply (3). The frequency source (11), the transmitter (12), and the receiver (13) are integrated on a same PCB to form a radio frequency integrated board (1); the signal processing board (2) and the radio frequency integrated board (1) are connected by means of an inter-board connector (14); the power supply (3) is fixed on the radio frequency integrated board (1), and is directly connected to the signal processing board (2) by means of a power supply interface; and the transmitting antennas (5) and the receiving antennas (4) are all located on the periphery of the radio frequency integrated board (1). The present invention has the advantages such as a simple and compact structure, light weight, and a simple and fast connection.

Description

A 3D penetrating wall radar system

Cross References to Related Applications

This application is based on the Chinese patent application with the filing date of "2021-06-22", the application number of "202110688373.2", and the invention title of "a three-dimensional wall-penetrating radar system", and claims its priority. The Chinese patent The entirety of the application is hereby incorporated by reference into this application as part of this application.

【Technical field】

The invention mainly relates to the technical field of wall-penetrating radar, in particular to a three-dimensional wall-penetrating radar system.

【Background technique】

Since the radar is used for detection through walls, considering the low-frequency penetration is better, the operating frequency of the radar should not be too high, which will cause the antenna size to not be too small, so that the overall size of the radar will be too large. Taking into account the anti-interference ability of the radio frequency circuit, each functional module is shielded with a separate structure, and finally fixed on the metal frame (realizing the common ground between the modules), so the weight of the whole machine will be much larger and the structure will be complicated. In addition, the ports of the radio frequency circuit can only be connected through radio frequency cables, which increases signal attenuation. The battery is also connected to the core through a long cable, which seriously reduces the power supply efficiency.

For the existing 3D through-the-wall radar, there is also a MIMO array with multiple transmissions and multiple receptions to realize 3D imaging. Each circuit module is sealed with a separate shielding shell, and then fixed on a large metal plate. The modules are connected by cables, and finally installed on the machine. in the shell. The above design method has the following disadvantages:

1. Large size and heavy weight: In the existing technology, in order to achieve better anti-interference ability, each circuit module is basically installed with an independent shielding structure. Each module is sealed with a metal structure and then stacked, which will inevitably increase the thickness of the radar. And lead to the heavy weight of the whole machine; or all circuit modules are placed in a metal structure with many small shielding cavities, and finally a large metal plate is needed to fix each module and share the ground, which is also large in size and heavy in weight. In addition, the RF cables and other cables between the modules are long and bulky, which will inevitably lead to heavy weight of the whole machine.

2. Low signal-to-noise ratio: In the prior art, the antenna and the radio frequency circuit are connected through radio frequency cables. In some radars, a radio frequency switch is added between the antenna and the radio frequency circuit, which will inevitably increase the noise of the receiving link , leading to a deterioration of the signal-to-noise ratio. However, in the prior art, each module is installed independently, and a radio frequency line connection and a radio frequency switch are necessarily required for switching.

3. The battery power supply efficiency is low and the connection is complicated: in the prior art, due to the independent packaging of each module, the battery and the power supply circuit can only be connected and powered by cables, and the loss on the cables is serious, which reduces the battery power supply efficiency ; And the connection of the movement is complicated, which easily leads to connection errors.

【Content of invention】

The technical problem to be solved by the present invention is: aiming at the problems existing in the prior art, the present invention provides a three-dimensional through-wall radar system with simple and compact structure, small volume, light weight, simple and fast connection.

In order to solve the problems of the technologies described above, the technical solution proposed by the present invention is:

A three-dimensional through-the-wall radar system includes a frequency source, a transmitter, a transmitting antenna, a receiving antenna, a receiver, a signal processing board and a power supply, and the frequency source, transmitter and receiver are integrated on the same PCB board to form a radio frequency integration board; the signal processing board is connected to the radio frequency integrated board through an inter-board connector; the power supply is fixed on the radio frequency integrated board and directly connected to the signal processing board through a power interface; the transmitting antenna and The receiving antennas are located on the periphery of the radio frequency integrated board.

As a further improvement of the above technical solution:

It also includes a casing, in which the frequency source, transmitter, transmitting antenna, receiving antenna, receiver, signal processing board and power supply are installed.

Both the transmitting antenna and the receiving antenna are directly connected to the radio frequency integrated board through a radio frequency connector.

Both the transmitting antenna and the receiving antenna are laminated slot-coupling antennas; wherein the slot layer of the laminated slot-coupling antenna is welded to the radio frequency integrated board, and the coupling layer of the stacking slot-coupling antenna is pasted by foam or fixed on the slot layer by a pillar The radio frequency signal on the radio frequency integrated board is directly fed back to the feeding point of the antenna slot layer, and then radiated through the slot on the slot layer to couple to the coupling layer, and then radiated out.

The transmitting antenna, the receiving antenna and the signal processing board are fastened on the radio frequency integrated board by fasteners.

The fasteners are screws or bolts.

The radio frequency integrated board is rectangular in shape as a whole; each of the transmitting antennas is installed on opposite sides of the rectangular radio frequency integrated board, and each of the receiving antennas is installed on the other opposite side of the rectangular radio frequency integrated board; The arrangement shape of the transmitting antenna and the receiving antenna is generally mouth-shaped or mouth-like, forming a uniform or non-uniform equivalent antenna array.

An installation hole is provided on the radio frequency integrated board, and the power supply is installed in the installation hole.

Compared with the prior art, the present invention has the advantages of:

The three-dimensional through-the-wall radar system of the present invention integrates the frequency source, the transmitter and the receiver on the radio frequency integrated board, and the integration degree is high; wherein the radio frequency integrated board is used as the base plate as the support, and the signal processing board, the transmitting antenna and the receiving antenna are all directly Installed on the RF integrated board, no other structural supports are required, and heavy metal shields are no longer needed, saving a lot of metal structures, making the structure simple and compact, and light in weight; the signal processing board and the RF integrated board pass through the inter-board Connectors, antennas and RF integrated boards are connected through connection interfaces, that is, in the form of plug-in, eliminating the connection between various components, the connection is fast and reliable, less prone to errors, and the signal-to-noise ratio is optimized; the connection between the power supply and the signal processing board The power interface adopts the form of plug-in direct connection to reduce the power transmission path loss, and the connection is simple, fast and reliable; all components of the radar system are fixed on the RF integrated board, and the fast connection between the components is realized through the docking interface. Reliable connection, which solves the complexity and possible instability of the connection between modules, and at the same time ensures the thinnest thickness of the movement, and no longer needs a metal fixing plate. The RF integrated board is used as a fixed module, antenna and signal processing board It is directly fixed on the RF integrated board, which further reduces the weight and volume of the whole machine, and realizes the miniaturization and light weight of the three-dimensional imaging radar; both the transmitting antenna and the receiving antenna are installed on the outer periphery of the RF integrated board, and the surrounding area The signal processing board and power supply are placed in the combined area, so as to effectively use the space and further achieve the purpose of light and small radar.

According to the working characteristics of the radar, the present invention analyzes the working frequency of the radar, and uses the working frequency of the S-band to realize the reduction of the size of the radar transmitting and receiving antenna and the distance between the antennas, thereby reducing the size of the antenna array of the three-dimensional imaging radar, that is, shortening the length of the radar and width.

【Description of drawings】

FIG. 1 is a block diagram of functional modules of a radar system in an embodiment of the present invention.

FIG. 2 is a structural block diagram of an embodiment of the radar system of the present invention.

Legend: 1. RF integrated board; 11. Frequency source; 12. Transmitter; 13. Receiver; 14. Inter-board connector; 2. Signal processing board; 3. Power supply; 4. Receiving antenna; 5. Transmitting antenna .

【detailed description】

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, the three-dimensional through-the-wall radar system of this embodiment includes a frequency source 11, a transmitter 12, a transmitting antenna 5, a receiving antenna 4, a receiver 13, a signal processing board 2 and a power supply 3, wherein the frequency The source 11 is used to provide a radio frequency signal; the transmitter 12 is used to amplify and output the radio frequency signal provided by the frequency source 11; the transmitting antenna 5 is used to radiate the radio frequency signal amplified by the transmitter 12; the receiving antenna 4 is used to The reflected radio frequency signal is sent to the radar receiver 13 for processing; the receiver 13 is used to amplify the received radio frequency echo signal, and down-convert the radio frequency signal to complete the intermediate frequency acquisition; the signal processing board 2. It is used to process the data received by the receiver 13 and give the radar detection result; the power supply 3 (such as a battery) is used to supply power to each part of the radar; wherein the frequency source 11, the transmitter 12 and the receiver 13 are integrated On the same PCB board, a radio frequency integrated board 1 is formed; the signal processing board 2 and the radio frequency integrated board 1 are connected by an inter-board connector 14; the transmitting antenna 5 and the receiving antenna 4 are installed on the periphery of the radio frequency integrated board 1; the power supply 3 It is fixed on the radio frequency integrated board 1, and is directly connected with the signal processing board 2 through the power interface. Wherein, the radio frequency integrated board 1 needs to be shielded using a metal shield (for example, 0.1 mm thick) for shielding treatment.

The three-dimensional wall-penetrating radar system of the present invention integrates the frequency source 11, the transmitter 12 and the receiver 13 on the radio frequency integrated board 1, and the integration degree is high; wherein the radio frequency integrated board 1 is used as the base plate as a support, the signal processing board 2, the transmitter Both the antenna 5 and the receiving antenna 4 are directly installed on the RF integrated board 1, no other structural supports are needed, and heavy metal shields are no longer needed, saving a lot of metal structures, thus making the structure simple and compact, small in size and light in weight;

The signal processing board 2 and the radio frequency integrated board 1 are connected through the inter-board connector 14, that is, the inter-board connector 14 is adopted, and the connection between the components is removed, the connection is fast and reliable, and it is not easy to make mistakes, and the signal-to-noise ratio is optimized; the power supply 3 The direct connection between the signal processing board 2 and the power interface is adopted to reduce the loss of the power transmission path, and the connection is simple, fast and reliable;

By fixing all the components of the radar system on the radio frequency integrated board 1, and realizing the fast and reliable connection between the components through the docking interface, the complexity and possible instability of the connection between the modules are solved, and the machine is guaranteed The core thickness is the thinnest, and the metal fixing plate is no longer needed. The RF integrated board 1 is regarded as a fixed module, and the transceiver antenna (including the transmitting antenna 5 and the receiving antenna 4, the same below) and the signal processing board 2 are directly connected to the RF integrated board 1 Fixed, which further reduces the weight and volume of the whole machine, and realizes the miniaturization and light weight of the 3D imaging radar;

Both the transmitting antenna 5 and the receiving antenna 4 are installed on the periphery of the radio frequency integrated board 1, and the area enclosed by the transmitting antenna 5 and the receiving antenna 4 is placed with the signal processing board 2 and the power supply 3, etc. small purpose.

In a specific embodiment, the frequency source 11 , the transmitter 12 , the transmitting antenna 5 , the receiving antenna 4 , the receiver 13 , the signal processing board 2 and the power supply 3 are all installed in a casing, and the structure is simple and compact.

In a specific embodiment, the transmitting antenna 5 , the receiving antenna 4 and the signal processing board 2 are all fastened on the radio frequency integrated board 1 by fasteners (not shown in the figure). Wherein the fastener is a screw or a bolt. Specifically, the transceiver antenna is fixed on the radio frequency integrated board 1 by screws, and is connected with the radio frequency integrated board 1 by a push-in radio frequency connector. The above design can ensure that the transmission output power can be radiated through the transmitting antenna 5 with almost no attenuation; there is almost no loss between the receiving antenna 4 and the receiving link. Under the same receiving link conditions, the overall receiving link noise figure will be much smaller ( If there is 1dB line loss between the receiving antenna 4 and the receiving link, then the receiving link noise figure will increase by 1dB), that is to say, such processing can ensure that the actual transmitting power of the transmitting antenna 5 is sufficient, and at the same time, the signal of the received signal The noise ratio has been optimized to a certain extent.

In another specific embodiment, the transceiver antenna adopts the form of a laminated slot-coupled antenna, and the slot layer of the transceiver antenna is welded to the radio frequency integrated board 1, and the radio frequency signal on the radio frequency integrated board 1 is directly fed back to the antenna slot layer through the via hole The feed point is connected and conducted, and the antenna coupling layer is pasted with foam or fixed on the radio frequency integrated board 1 through pillars. In this way, the connection between the transceiver antenna and the radio frequency integrated board 1 can be realized without the radio frequency connector, the structure is simple, and the miniaturization and light weight of the radar can be further realized. Among them, the laminated slot coupling antenna is a conventional antenna, which specifically includes two PCBs, the lower one is a slot layer, the upper one is a coupling layer, and there is a certain air gap in the middle (the air gap can be filled with foam materials, and the two layers are passed through high temperature resistant glue. fixed on the foam material, and can also be fixed by adding pillars between the two layers), the radio frequency signal on the radio frequency integrated board 1 is connected to the gap layer, and the radio frequency signal is coupled to the coupling layer through the gap radiation on the gap layer, and finally Radiate out.

In a specific embodiment, the radio frequency integrated board 1 is rectangular as a whole; each transmitting antenna 5 is installed on the opposite sides of the rectangular radio frequency integrated board 1, and each receiving antenna 4 is installed on the other opposite side of the rectangular radio frequency integrated board 1. On both sides; the arrangement shapes of the transmitting antennas 5 and the receiving antennas 4 are generally in the shape of a "mouth" or similar to a "mouth". Among them, the transmission channel adopts the time-division mode, and multi-channel reception works at the same time to collect data. The "mouth"-shaped antenna structure is designed, and the transceiver antenna is located around the radio frequency integrated board 1. In the area surrounded by the transceiver antenna, it can be used to place signals. The processing board 2 and the power supply 3, etc., compared with the traditional antenna surface where other modules cannot be placed, the above design can effectively use the space and achieve the purpose of light and small radar.

In a specific embodiment, when the operating frequency of the radar is high, the size of the three-dimensional imaging antenna array can be kept small. According to the principle of radar detection, when the distance between the antennas is half a wavelength, the radar detection effect is the best, then when the radar operating frequency increases, the corresponding wavelength becomes shorter, so that the distance between the antennas can be shortened sharply, so that Miniaturized antenna array. Therefore, the operating frequency of the radar adopts the S-band frequency; the distance between the transmitting antennas 5 and the distance between the receiving antennas 4 is half a wavelength, and on the basis of ensuring three-dimensional imaging, the size of the antenna array is greatly reduced to realize the radar Reduction in overall length and width.

In a specific embodiment, the radio frequency integrated board 1 is provided with a mounting hole, and the power supply 3 (such as a battery) is installed in the mounting hole, and then directly supplies power to the core of the signal processing board 2 after the battery interface is plugged in, which is extremely large. The power supply path is shortened, and the battery power supply efficiency is improved. All the power 3 and control signals of the RF integrated board 1 are provided by the signal processing board 2 , and the data collected by the ADC on the RF integrated board 1 is transmitted through the inter-board connector 14 .

All parts of the present invention are locked on the radio frequency integrated board 1 by fasteners (such as screws) for fixing, no metal fixing plate is needed, and no external cables are used to connect each module, clean and tidy, more stable and reliable, and the core The overall thickness has also been extremely compressed; the design of the present invention has achieved a relatively large reduction in the length, width and thickness of the radar, the internal movement is connected simply, and the weight of the whole machine has also been significantly reduced. The purpose of miniaturization and light weight design makes the radar more portable, stable and reliable.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

A three-dimensional through-wall radar system, comprising a frequency source (11), a transmitter (12), a transmitting antenna (5), a receiving antenna (4), a receiver (13), a signal processing board (2) and a power supply (3) , characterized in that the frequency source (11), transmitter (12) and receiver (13) are integrated on the same PCB board to form a radio frequency integrated board (1); the signal processing board (2) is integrated with the radio frequency The boards (1) are connected by an inter-board connector (14); the power supply (3) is fixed on the radio frequency integrated board (1), and is directly connected to the signal processing board (2) through a power supply interface; Both the transmitting antenna (5) and the receiving antenna (4) are located on the outer periphery of the radio frequency integrated board (1).
The three-dimensional wall-penetrating radar system according to claim 1, further comprising a housing, the frequency source (11), transmitter (12), transmitting antenna (5), receiving antenna (4), receiver (13), the signal processing board (2) and the power supply (3) are all installed in the casing.
The three-dimensional through-wall radar system according to claim 1, characterized in that, both the transmitting antenna (5) and the receiving antenna (4) are directly connected to the radio frequency integrated board (1) through a radio frequency connector.
The three-dimensional wall-penetrating radar system according to claim 1, wherein the transmitting antenna (5) and the receiving antenna (4) are both laminated slot coupling antennas; wherein the slot layer of the laminated slot coupling antenna is welded to the radio frequency On the integrated board (1), the coupling layer of the laminated slot coupling antenna is pasted with foam or fixed on the slot layer through pillars; the radio frequency signal on the RF integrated board (1) is directly fed to the feed point of the antenna slot layer, and then passed through the slot The slits in the coupling layer radiate to the coupling layer and radiate out.
The three-dimensional wall-penetrating radar system according to claim 1, 2 or 3, characterized in that, the transmitting antenna (5), the receiving antenna (4) and the signal processing board (2) are all fastened to the on the RF integrated board (1).
The three-dimensional wall-penetrating radar system according to claim 5, wherein the fasteners are screws or bolts.
The three-dimensional wall-penetrating radar system according to any one of claims 1 to 4, wherein the radio frequency integrated board (1) is rectangular as a whole; each transmitting antenna (5) is installed on the rectangular radio frequency integrated board (1) on opposite two sides, each described receiving antenna (4) is installed on another opposite two sides of the rectangular radio frequency integrated board (1); each described transmitting antenna (5) and receiving antenna (4) ) is arranged in a mouth-like or mouth-like shape as a whole, forming a uniform or non-uniform equivalent antenna array.
The three-dimensional through-wall radar system according to any one of claims 1 to 4, characterized in that, the radio frequency integrated board (1) is provided with a mounting hole, and the power supply (3) is mounted in the mounting hole .