Radar antenna measurement system

Abstract

The invention relates to the technical field of radar measurement, and discloses a radar antenna measurement system, which comprises a radar antenna subarray, a wave controller, a synthesizer, a signal receiving channel and a processor, and is characterized in that the radar antenna subarray is used for transmitting an electromagnetic wave detection signal to a target and receiving a first echo signal reflected by the target; the wave controller is used for performing phase change processing on the phase of part of the first echo signal to obtain a processed echo signal; the radar antenna subarray is also used for transmitting the processed echo signal and the echo signal which is not processed by the wave controller in the first echo signal to the synthesizer; the synthesizer is used for synthesizing the received echo signal to obtain a second echo signal and transmitting the second echo signal to the signal receiving channel; the signal receiving channel is used for performing analog-to-digital conversion processing on the second echo signal to obtain a first digital echo signal and transmitting the first digital echo signal to the processor; the processor is used for measuring and determining position information of the target according to the first digital echo signal. According to the invention, hardware resources of the radar system are saved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of radar measurement technology, and specifically to a radar antenna measurement system. Background Art

[0002] In order to measure the target's position information (distance, azimuth and elevation), if multiple channels (sum channel, azimuth difference channel and elevation difference channel) are set in the radar system to measure the target's position information, since each channel requires corresponding network support, this method has high hardware requirements for the radar system, and the radar system needs to consume more hardware resources. Summary of the invention

[0003] In view of the above problems, an embodiment of the present application provides a radar antenna measurement system for solving the problem in the prior art that the radar system consumes a large amount of hardware resources.

[0004] According to one aspect of an embodiment of the present application, a radar antenna measurement system is provided, the system comprising a radar antenna array composed of a plurality of radar antenna subarrays, a wave controller, a synthesizer, a signal receiving channel and a processor, wherein each of the radar antenna subarrays is used to transmit an electromagnetic wave detection signal to a target and receive a first echo signal reflected by the target; the wave controller is used to perform phase change processing on a phase of part of the first echo signal to obtain a processed echo signal; the radar antenna subarray is also used to transmit the processed echo signal and the echo signal in the first echo signal that has not been processed by the wave controller to the synthesizer; the synthesizer is used to receive the echo signal sent by the radar antenna subarray, perform synthesis processing on the received echo signal to obtain a second echo signal, and transmit the second echo signal to the signal receiving channel; the signal receiving channel is used to receive the second echo signal, perform analog-to-digital conversion processing on the second echo signal to obtain a first digital echo signal, and transmit the first digital echo signal to the processor; the processor is used to receive the first digital echo signal, and measure and determine the position information of the target according to the first digital echo signal.

[0005] In an optional manner, the system includes four radar antenna subarrays, and the four radar antenna subarrays form a 2×2 array.

[0006] In an optional manner, the echo signals transmitted by the four radar antenna subarrays to the synthesizer are A, B, C and D, respectively, and are all positive-phase echo signals; the processor is used to measure and determine the distance information and speed information of the target based on the first digital echo signal (A+B+C+D).

[0007] In an optional manner, the echo signals transmitted by the four radar antenna subarrays to the synthesizer are A, B, -C and -D respectively, A and B are positive phase echo signals, and -C and -D are negative phase echo signals; the radar antenna subarray transmitting echo signals A and B is located in the first row of the 2×2 array, and the radar antenna subarray transmitting echo signals A and -C is located in the first column of the 2×2 array; the processor is used to measure and determine the pitch angle of the target according to the first digital echo signal (A+B-(C+D)).

[0008] In an optional manner, the echo signals transmitted by the four radar antenna subarrays to the synthesizer are A, -B, C and -D respectively, A and C are both positive phase echo signals, and -B and -D are both negative phase echo signals; the radar antenna subarray transmitting echo signals A and -B is located in the first row of the 2×2 array, and the radar antenna subarray transmitting echo signals A and C is located in the first column of the 2×2 array; the processor is used to measure and determine the azimuth of the target according to the first digital echo signal (A+C-(B+D)).

[0009] In an optional manner, the processor is also used to store the first digital echo signal; the wave controller is also used to control the first radar antenna in the radar antenna array to be in a closed state, and the other radar antennas in the radar antenna array except the first radar antenna are used to receive the first electromagnetic wave signal, and transmit the first electromagnetic wave signal to the signal receiving channel through the synthesizer; the signal receiving channel is used to receive the first electromagnetic wave signal, perform analog-to-digital conversion on the first electromagnetic wave signal to obtain a first digital electromagnetic wave signal, and transmit the first digital electromagnetic wave signal to the processor; the processor is used to receive the first digital electromagnetic wave signal, and perform sidelobe blanking processing on the first digital electromagnetic wave signal according to the first digital electromagnetic wave signal.

[0010] In an optional manner, the synthesizer includes a first synthesizer and a second synthesizer, the signal receiving channel includes a first receiving channel and a second receiving channel; the four radar antenna subarrays are respectively a first radar antenna subarray, a second radar antenna subarray, a third radar antenna subarray and a fourth radar antenna subarray, the first radar antenna subarray and the second radar antenna subarray are located in the first row of the 2×2 array, and the first radar antenna subarray and the third radar antenna subarray are located in the first column of the 2×2 array; the first echo signal includes a first sub-echo signal and a second sub-echo signal, the first sub-echo signal is the first radar antenna subarray and the second radar antenna subarray, the second sub echo signal is the echo signal received by the third radar antenna subarray and the fourth radar antenna subarray; the first radar antenna subarray and the second radar antenna subarray are used to transmit the echo signal of the first sub echo signal that has been processed by the wave controller and the echo signal of the first sub echo signal that has not been processed by the wave controller to the first synthesizer; the third radar antenna subarray and the fourth radar antenna subarray are used to transmit the echo signal of the second sub echo signal that has been processed by the wave controller and the echo signal of the second sub echo signal that has not been processed by the wave controller to the first synthesizer. The echo signal processed by the wave controller is transmitted to the second synthesizer; the first synthesizer is used to receive the echo signals sent by the first radar antenna subarray and the second radar antenna subarray, perform synthesis processing on the received echo signals to obtain a third echo signal, and transmit the third echo signal to the first receiving channel; the second synthesizer is used to receive the echo signals sent by the third radar antenna subarray and the fourth radar antenna subarray, perform synthesis processing on the received echo signals to obtain a fourth echo signal, and transmit the fourth echo signal to the second receiving channel; the first receiving channel is used to receive the third echo signal, The third echo signal is subjected to analog-to-digital conversion processing to obtain a second digital echo signal, and the second digital echo signal is transmitted to the processor; the second receiving channel is used to receive the fourth echo signal, perform analog-to-digital conversion processing on the fourth echo signal to obtain a third digital echo signal, and transmit the third digital echo signal to the processor; the processor is used to receive the second digital echo signal and the third digital echo information, perform synthesis processing on the second digital echo signal and the third digital echo signal to obtain a fourth digital echo signal, and measure and determine the position information of the target according to the fourth digital echo signal.

[0011] In an optional manner, the echo signal transmitted by the first radar antenna subarray to the first synthesizer is A; the echo signals transmitted by the second radar antenna subarray to the first synthesizer include B and -B, wherein echo signal -B is a signal obtained after the wave controller performs phase change processing on echo signal B; the echo signal transmitted by the third radar antenna subarray to the second synthesizer is C; the echo signals transmitted by the fourth radar antenna subarray to the second synthesizer include D and -D, wherein echo signal -D is a signal obtained after the wave controller performs phase change processing on echo signal D; in the third echo signal When the third echo signal is AB and the fourth echo signal is CD, the processor is used to measure and determine the distance information and speed information of the target according to the first fourth digital echo signal (A+B+C+D), and to synthesize the fifth echo signal -(C+D) according to the fourth echo signal C+D, and to measure and determine the pitch angle of the target according to the second fourth digital echo signal (A+B-(C+D)); when the third echo signal is AB and the fourth echo signal is CD, the processor is used to measure and determine the azimuth of the target according to the third fourth digital echo signal (A+C-(B+D)).

[0012] In an optional manner, the echo signals transmitted by the first radar antenna subarray and the second radar antenna subarray to the first synthesizer are A and B respectively; the echo signal transmitted by the third radar antenna subarray to the second synthesizer is C; the echo signals transmitted by the fourth radar antenna subarray to the second synthesizer include D and -D, wherein the echo signal -D is a signal obtained after the wave controller performs phase change processing on the echo signal D; when the third echo signal is (A+B) and the fourth echo signal is (C+D), the processor is used to measure according to the first fourth digital echo signal (A+B+C+D) The processor is further configured to measure and determine the distance information and speed information of the target, synthesize the fifth echo signal -(C+D) according to the fourth echo signal (C+D), and measure and determine the pitch angle of the target according to the second fourth digital echo signal (A+B-(C+D)); when the third echo signal is (A+B) and the fourth echo signal is (CD), the processor is further configured to obtain the echo signal (A'-B') according to the phase difference fitting between the echo signal (A+B) and the echo signal (CD), and measure and determine the azimuth of the target according to the third fourth digital echo signal (A+B) and (A'-B').

[0013] In an optional manner, the wave controller is used to control the second radar antenna in the first radar antenna subarray and the second radar antenna subarray to be in a closed state; the other radar antennas in the first radar antenna subarray and the second radar antenna subarray except the second radar antenna are used to receive a second electromagnetic wave signal, and transmit the second electromagnetic wave signal to the first receiving channel through the first synthesizer; the first receiving channel is used to receive the second electromagnetic wave signal, perform analog-to-digital conversion on the second electromagnetic wave signal to obtain a second digital electromagnetic wave signal, and transmit the second digital electromagnetic wave signal to the processor; the processor is used to receive the second digital electromagnetic wave signal, and perform sidelobe concealment on the fourth digital echo signal according to the second digital electromagnetic wave signal. shadow processing; or, the wave controller is used to control the third radar antenna subarray and the third radar antenna in the fourth radar antenna subarray to be in a closed state; the other radar antennas except the third radar antenna in the third radar antenna subarray and the fourth radar antenna subarray are used to receive a third electromagnetic wave signal, and transmit the third electromagnetic wave signal to the second receiving channel through the second synthesizer; the second receiving channel is used to receive the third electromagnetic wave signal, perform analog-to-digital conversion on the third electromagnetic wave signal, obtain a third digital electromagnetic wave signal, and transmit the third digital electromagnetic wave signal to the processor; the processor is used to receive the third digital electromagnetic wave signal, and perform sidelobe blanking processing on the fourth digital echo signal according to the third digital electromagnetic wave signal.

[0014] In the embodiment of the present application, since only one synthesizer and one signal receiving channel are provided in the radar antenna measurement system, the distance information, speed information, pitch angle and azimuth of the target can be measured and determined respectively. Compared with the method of setting multiple synthesizers and multiple channels, the hardware resources of the radar antenna measurement system can be saved and the volume of the radar antenna measurement system can be reduced.

[0015] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0017] Figure 1 A schematic diagram of a radar antenna measurement system provided in an embodiment of the present application is shown;

[0018] Figure 2 The waveform diagram of the main antenna and the auxiliary antenna provided in the embodiment of the present application is shown;

[0019] Figure 3 A schematic diagram of a radar antenna measurement system provided by another embodiment of the present application is shown.

[0020] The reference numerals in the specific implementation manner are as follows:

[0021] 1. Radar antenna measurement system;

[0022] 10. Radar antenna array; 11. First radar antenna subarray; 12. Second radar antenna subarray; 13. Third radar antenna subarray; 14. Fourth radar antenna subarray; 20. Wave controller; 30. Synthesizer; 31. First synthesizer; 32. Second synthesizer; 40. Signal receiving channel; 41. First receiving channel; 42. Second receiving channel; 50. Processor; 101. Main antenna waveform; 102. Auxiliary antenna waveform. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating any combination of the listed objects. For example, "A and / or B" can mean: A exists, A and B exist at the same time, or B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0029] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0030] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0031] If the sum channel, azimuth difference channel and elevation difference channel are set up simultaneously in the radar system to measure the distance, azimuth and elevation angle of the target respectively, since each channel requires corresponding network support, this method has high hardware requirements for the radar system and consumes more hardware resources.

[0032] In view of the above problems, an embodiment of the present application proposes a radar antenna measurement system, including a wave controller, a synthesizer, a signal receiving channel, a processor and a plurality of radar antenna subarrays. The radar antenna subarray transmits an electromagnetic wave detection signal to a target and receives an echo signal reflected by the target. The wave controller performs phase change processing on part of the echo signal. The radar antenna subarray transmits the echo signal processed by the wave controller and the echo signal not processed by the wave controller to the synthesizer. After receiving the echo signal sent by the radar antenna subarray, the synthesizer performs synthesis processing on the received echo signal, wherein the synthesized signal can be used to measure and determine the distance information, pitch angle and azimuth of the target. The synthesizer transmits the synthesized signal to the signal receiving channel. The signal receiving channel performs analog-to-digital conversion processing on the synthesized signal to obtain a digital signal, and transmits the digital signal to the processor. The processor measures and determines the distance information, pitch angle and azimuth of the target based on the digital signal. For the three types of information that need to be measured: distance information, pitch angle and azimuth, there is no need to set up three synthesizers and three signal receiving channels, thus saving the hardware resources of the radar system.

[0033] Figure 1 FIG. 1 is a schematic diagram of a radar antenna measurement system provided in an embodiment of the present application. Figure 1 As shown, the radar antenna measurement system 1 includes a radar antenna array 10, a wave controller 20, a synthesizer 30, a signal receiving channel 40 and a processor 50. The radar antenna array 10 includes a first radar antenna subarray 11, a second radar antenna subarray 12, a third radar antenna subarray 13 and a fourth radar antenna subarray 14. Each radar antenna subarray includes one or more radar antennas, which transmit electromagnetic wave detection signals to the target and receive the first echo signal reflected by the target. In the figure, the four radar antenna subarrays form a 2×2 array, and the first radar antenna subarray 11 and the second radar antenna subarray 12 are located in the first row of the 2×2 array, and the third radar antenna subarray 13 and the fourth radar antenna subarray 14 are located in the first column of the 2×2 array. In order to distinguish the first echo signals reflected by the target received by different radar antenna subarrays, the figure takes the echo signal reflected by the target received by the first radar antenna subarray 11 as A, the echo signal reflected by the target received by the second radar antenna subarray 12 as B, the echo signal reflected by the target received by the third radar antenna subarray 13 as C, and the echo signal reflected by the target received by the fourth radar antenna subarray 14 as D as an example for illustration. The echo signals reflected by the target received by the four radar antenna subarrays constitute the first echo signal. It is worth noting that Figure 1 In the description, the radar antenna array 10 including four radar antenna sub-arrays is taken as an example, and the present application does not limit the number of radar antenna sub-arrays.

[0034] In the embodiment of the present application, after the radar antenna array 10 transmits an electromagnetic wave detection signal to the target, the first radar antenna subarray 11 transmits the received echo signal A emitted by the target to the synthesizer 30, the second radar antenna subarray 12 transmits the received echo signal B emitted by the target to the synthesizer 30, the third radar antenna subarray 13 transmits the received echo signal C emitted by the target to the synthesizer 30, and the fourth radar antenna subarray 14 transmits the received echo signal D emitted by the target to the synthesizer 30. The synthesizer 30 performs in-phase synthesis processing on the received echo signals A, B, C and D to obtain a synthesized echo signal (A+B+C+D), and transmits the signal (A+B+C+D) to the signal receiving channel 40. Among them, the echo signal (A+B+C+D) corresponds to the channel signal. The signal receiving channel 40 receives the echo signal (A+B+C+D). Since the first echo signal emitted by the target received by the radar antenna array 10 is an analog signal, the signal receiving channel 40 also performs analog-to-digital conversion processing on the received analog echo signal (A+B+C+D) to obtain a digital echo signal (A+B+C+D), and transmits the digital echo signal (A+B+C+D) to the processor. The processor 50 measures and determines the distance information of the target through the echo delay of the target according to the digital echo signal (A+B+C+D), and measures and determines the speed information of the target through the Doppler frequency of the target.

[0035] In order to measure and determine the pitch angle of the target, in the embodiment of the present application, after the radar antenna array 10 transmits an electromagnetic wave detection signal to the target, the wave controller 20 performs phase change processing on the echo signal C reflected by the target received by the third radar antenna subarray 13 to obtain a negative phase signal -C, and performs phase change processing on the echo signal D reflected by the target received by the fourth radar antenna subarray 14 to obtain a negative phase signal -D. The first radar antenna subarray 11 transmits the echo signal A to the synthesizer 30, the second radar antenna subarray 12 transmits the echo signal B to the synthesizer 30, the third radar antenna subarray 13 transmits the echo signal -C processed by the wave controller to the synthesizer 30, and the fourth radar antenna subarray 14 transmits the echo signal -D processed by the wave controller to the synthesizer 30. The synthesizer 30 performs synthesis processing on the received echo signals A, B, -C and -D to obtain a simulated echo signal (A+B-(C+D)), and transmits the simulated echo signal (A+B-(C+D)) to the signal receiving channel 40. The signal receiving channel 40 performs analog-to-digital conversion processing on the received analog echo signal (A+B-(C+D)) to obtain a digital echo signal (A+B-(C+D)), and transmits the digital echo signal (A+B-(C+D)) to the processor 50. The processor 50 measures and determines the pitch angle of the target according to the digital echo signal (A+B-(C+D)) by sum-difference ratio amplitude ratio phase angle measurement method.

[0036] In order to measure and determine the azimuth of the target, in the embodiment of the present application, after the radar antenna array 10 transmits an electromagnetic wave detection signal to the target, the wave controller 20 performs phase change processing on the echo signal B reflected by the target received by the second radar antenna subarray 12 to obtain a negative phase signal -B, and performs phase change processing on the echo signal D reflected by the target received by the fourth radar antenna subarray 14 to obtain a negative phase signal -D. The first radar antenna subarray 11 transmits the echo signal A to the synthesizer 30, the second radar antenna subarray 12 transmits the echo signal -B processed by the wave controller to the synthesizer 30, the third radar antenna subarray 13 transmits the echo signal C to the synthesizer 30, and the fourth radar antenna subarray 14 transmits the echo signal -D processed by the wave controller to the synthesizer 30. The synthesizer 30 synthesizes the received signals A, -B, C and -D to obtain an analog signal ((A+C-(B+D)), and transmits the analog signal (A+C-(B+D)) to the signal receiving channel 40. The signal receiving channel 40 performs analog-to-digital conversion processing on the received analog signal (A+C-(B+D)) to obtain a digital signal (A+C-(B+D)), and transmits the digital signal (A+C-(B+D)) to the processor 50. The processor 50 measures and determines the azimuth of the target according to the digital signal ((A+C-(B+D)) by sum-difference ratio amplitude ratio phase angle measurement method.

[0037] In the embodiment of the present application, since only one synthesizer and one signal receiving channel are provided in the radar antenna measurement system 1, the distance information, speed information, pitch angle and azimuth of the target can be measured and determined respectively. Compared with the method of setting multiple synthesizers and multiple channels, the hardware resources of the radar antenna measurement system 1 can be saved and the volume of the radar antenna measurement system 1 can be reduced.

[0038] It is worth noting that when the radar antenna measurement system 1 is used to measure a target, since the three types of information, namely, the distance information, the pitch angle, and the azimuth angle of the target are determined independently, the order of measuring the three types of information can be determined as needed. For example, the radar antenna measurement system 1 can be used to first determine the pitch angle, then determine the azimuth angle, and finally determine the distance information; or the radar antenna measurement system 1 can be used to first determine the azimuth angle, then determine the pitch angle, and finally determine the distance information, etc.

[0039] In order to improve the accuracy of the position information of the determined target, in some embodiments, when the radar antenna array 10 measures and determines the position information and speed information of the target, the processor 50 also stores the digital echo signal (A+B+C+D). The wave controller 20 also controls the first radar antenna in the radar antenna array 10 to be in an off state. Among them, the first radar antenna is one or more radar antennas in the radar antenna array 10, and the first radar antenna can be an antenna in the first radar antenna subarray 11, the second radar antenna subarray 12, the third radar antenna subarray 13 and / or the fourth radar antenna subarray 14. The first radar antenna can be set as needed, which is not limited here. In the embodiment of the present application, preferably, the first radar antenna is a radar antenna other than the radar antenna located at the center and vicinity of the radar antenna array 10. The wave controller 20 also controls the other radar antennas in the radar antenna array 10 except the first radar antenna to receive the first electromagnetic wave signal, and transmits the first electromagnetic wave signal to the signal receiving channel 40 through the synthesizer 30. The first electromagnetic wave signal is an electromagnetic wave signal reflected by an interference object and received when other radar antennas in the radar antenna array 10 except the first radar antenna do not transmit electromagnetic wave detection signals to the target.

[0040] The signal receiving channel 40 receives the first electromagnetic wave signal, performs analog-to-digital conversion on the first electromagnetic wave signal to obtain a first digital electromagnetic wave signal, and transmits the first digital electromagnetic wave signal to the processor 50. The processor 50 receives the first digital electromagnetic wave signal, and performs sidelobe blanking processing on the digital echo signal (A+B+C+D) according to the first digital electromagnetic wave signal.

[0041] In order to better understand the sidelobe blanking technology, Figure 2 1 shows the waveform diagram of the main antenna and the auxiliary antenna provided in the embodiment of the present application. Figure 2 As shown, after the radar antenna array 10 transmits an electromagnetic wave detection signal to the target, the waveform of the echo signal reflected by the target received is the main antenna waveform 101. According to the main antenna waveform 101, the target may correspond to point A, B1, B2, C1, C2, D1 or D2. The first electromagnetic wave signal received by the radar antenna array 10 with the first radar antenna in the off state is the auxiliary antenna waveform 102. Combined with the auxiliary antenna waveform 102, since the gains corresponding to points B1, B2, C1, C2, D1 and D2 are all smaller than the gains of each point in the auxiliary antenna waveform 102, the target corresponding point A can be determined.

[0042] Since there will be main lobes and side lobes in the digital echo signal (A+B+C+D), in an embodiment of the present application, by performing sidelobe blanking processing on the digital echo signal (A+B+C+D) based on the first digital electromagnetic wave signal, the accuracy of the target position information determined according to the digital echo signal (A+B+C+D) can be improved, thereby improving the anti-interference capability and target detection capability of the radar antenna measurement system 1.

[0043] Figure 3 FIG. 2 is a schematic diagram of a radar antenna measurement system provided by another embodiment of the present application. Figure 3 As shown, the radar antenna measurement system 1 includes a radar antenna array 10, a wave controller 20, a first synthesizer 31, a second synthesizer 32, a first receiving channel 41, a second receiving channel 42 and a processor 50. The structure of the radar antenna array 10 is similar to Figure 1 The structures of the radar antenna array 10 in the provided embodiments are similar. The main difference between the two is that: Figure 3 The illustrated embodiment includes two synthesizers and two receiving channels. The first radar antenna subarray 11 and the second radar antenna subarray 12 transmit their received echo signals to the first synthesizer 31, and the third radar antenna subarray 13 and the fourth radar antenna subarray 14 transmit their received echo signals to the second synthesizer 32.

[0044] In the embodiment of the present application, after the radar antenna array 10 transmits an electromagnetic wave detection signal to the target, the first echo signal reflected by the target received by the radar antenna array 10 includes a first sub-echo signal and a second sub-echo signal. The first sub-echo signal includes an echo signal reflected by the target received by the first radar antenna sub-array 11 and the second radar antenna sub-array 12, and the second sub-echo signal includes an echo signal reflected by the target received by the third radar antenna sub-array 13 and the fourth radar antenna sub-array 14.

[0045] The first radar antenna subarray 11 transmits the echo signal A to the first synthesizer 31, and the second radar antenna subarray 12 transmits the echo signal B to the first synthesizer 31. The first synthesizer 31 synthesizes the received echo signals A and B to obtain an echo signal (A+B), and transmits the echo signal (A+B) to the first receiving channel 41. The first receiving channel 41 receives the echo signal (A+B), performs analog-to-digital conversion on it, obtains a digital echo signal (A+B), and transmits it to the processor 50.

[0046] The third radar antenna subarray 13 transmits the echo signal C to the second synthesizer 32, and the fourth radar antenna subarray 14 transmits the echo signal D to the second synthesizer 32. The second synthesizer 32 synthesizes the received echo signals C and D to obtain an echo signal (C+D), and transmits the echo signal (C+D) to the second receiving channel 42. The second receiving channel 42 receives the echo signal (C+D), performs analog-to-digital conversion on it, obtains a digital echo signal (C+D), and transmits it to the processor 50.

[0047] The processor 50 receives the digital echo signals (A+B) and (C+D) and synthesizes them into a digital echo signal (A+B+C+D), and then determines the distance information and speed information of the target according to the digital echo signal (A+B+C+D).

[0048] The processor 50 also performs phase change processing on the digital echo signal (C+D) to obtain a digital echo signal -(C+D), and synthesizes the digital echo signals (A+B) and -(C+D) into a digital echo signal (A+B-(C+D)), and then measures and determines the pitch angle of the target based on the digital echo signal (A+B-(C+D)) by using the sum-difference ratio, amplitude-ratio and phase-ratio angle measurement method.

[0049] After the radar antenna array 10 transmits an electromagnetic wave detection signal to the target, the wave controller 20 performs phase change processing on the echo signals B and D received by the second radar antenna subarray 12 and the fourth radar antenna subarray 14 to obtain echo signals -B and -D.

[0050] The first radar antenna subarray 11 and the second radar antenna subarray 12 transmit the echo signals A and -B to the first receiving channel 41 through the first synthesizer 31, respectively. The first receiving channel 41 receives the echo signals A and -B, performs analog-to-digital conversion processing on the echo signals A and -B, obtains digital echo signals A and -B, and transmits the digital echo signals A and -B to the processor 50. The third radar antenna subarray 13 and the fourth radar antenna subarray 14 transmit the echo signals C and -D to the second receiving channel 42 through the second synthesizer 32, respectively. The second receiving channel 42 receives the echo signals C and -D, performs analog-to-digital conversion processing on the echo signals C and -D, obtains digital echo signals C and -D, and transmits the digital echo signals C and -D to the processor 50. The processor 50 receives the digital echo signals A, -B, C and -D, and synthesizes them into a digital echo signal (A+C-(B+D)), and then measures and determines the azimuth of the target based on the digital echo signal (A+C-(B+D)) by sum-difference, amplitude-ratio and phase-ratio angle measurement.

[0051] In the embodiment of the present application, by transmitting electromagnetic wave detection signals to the target twice through the radar antenna array 10, the distance information, speed information, pitch angle and azimuth angle of the target can be measured and determined according to the echo signal received by the radar antenna array 10, thereby improving the efficiency of determining the target's position information.

[0052] It is worth noting that the order of measuring and determining the distance information, elevation angle and azimuth angle of the target by the radar antenna array 10 can be determined as needed and is not limited here.

[0053] In some embodiments, after the radar antenna array 10 transmits an electromagnetic wave detection signal to the target, the first radar antenna subarray 11 and the second radar antenna subarray 12 transmit the echo signals A and B to the first synthesizer 31, respectively. The first synthesizer 31 receives the echo signals A and B, performs synthesis processing on the received echo signals, obtains the echo signal (A+B), and transmits the echo signal (A+B) to the first receiving channel 41. The first receiving channel 41 receives the echo signal (A+B), performs analog-to-digital conversion processing on it, obtains the digital echo signal (A+B), and transmits the digital echo signal (A+B) to the processor 50. The third radar antenna subarray 13 and the fourth radar antenna subarray 14 transmit the echo signals C and D to the second synthesizer 32, respectively. The second synthesizer 32 receives the echo signals C and D, performs synthesis processing on the received echo signals, obtains the echo signal (C+D), and transmits the echo signal (C+D) to the second receiving channel 42. The second receiving channel 42 receives the echo signal (C+D), performs analog-to-digital conversion processing on it, obtains a digital echo signal (C+D), and transmits the digital echo signal (C+D) to the processor 50. The processor 50 receives the digital echo signals (A+B) and (C+D), synthesizes them into a digital echo signal (A+B+C+D), and measures and determines the position information and speed information of the target according to the digital echo signal (A+B+C+D). The processor 50 also performs phase change processing on the digital echo signal (C+D) to obtain a digital echo signal -(C+D), synthesizes the digital echo signals (A+B) and -(C+D) to obtain a digital echo signal (A+B-(C+D)), and measures and determines the pitch angle of the target according to the digital echo signal (A+B-(C+D)).

[0054] After the radar antenna array 10 transmits an electromagnetic wave detection signal to the target, the wave controller 20 performs phase change processing on the echo signal D received by the fourth radar antenna subarray 14 to obtain an echo signal -D. The first radar antenna subarray 11 and the second radar antenna subarray 12 transmit the echo signals A and B to the first synthesizer 31 respectively. The first synthesizer 31 receives the echo signals A and B, and performs synthesis processing on the received echo signals to obtain an echo signal (A+B), and transmits the echo signal (A+B) to the first receiving channel 41. The first receiving channel 41 receives the echo signal (A+B), performs analog-to-digital conversion processing on it, obtains a digital echo signal (A+B), and transmits the digital echo signal (A+B) to the processor 50. The third radar antenna subarray 13 and the fourth radar antenna subarray 14 transmit the echo signals C and -D to the second synthesizer 32 respectively. The second synthesizer 32 receives the echo signals C and -D, and synthesizes the received echo signals to obtain the echo signal (CD), and transmits the echo signal (CD) to the second receiving channel 42. The second receiving channel 42 receives the echo signal (CD), performs analog-to-digital conversion processing on it, obtains the digital echo signal (CD), and transmits the digital echo signal (CD) to the processor 50. The processor 50 uses the pitch angle of the target measured and determined above to compensate for the phase difference caused by the pitch angle of the echo signal (A+B) and the echo signal (CD), and obtains the echo signal (A'-B') by fitting, and determines the azimuth of the target by sum and difference angle measurement according to the echo signals (A+B) and (A'-B').

[0055] In the embodiment of the present application, by transmitting electromagnetic wave detection signals to the target twice through the radar antenna array 10, the distance information, speed information, pitch angle and azimuth angle of the target can be measured and determined according to the echo signal received by the radar antenna array 10, thereby improving the efficiency of determining the target's position information.

[0056] It is worth noting that the order of measuring and determining the distance information, elevation angle and azimuth angle of the target by the radar antenna array 10 can be determined as needed and is not limited here.

[0057] In order to improve the accuracy of the position information of the determined target, in some embodiments, the wave controller 20 also controls the second radar antenna in the first radar antenna subarray 11 and the second radar antenna subarray 12 to be in a closed state. The second radar antenna is one or more radar antennas in the first radar antenna subarray 11 and the second radar antenna subarray 12. The second radar antenna can be determined as needed and is not limited here. The wave controller 20 also controls the other radar antennas in the first radar antenna subarray 11 and the second radar antenna subarray 12 except the second radar antenna to receive the second electromagnetic wave signal, and transmits the second electromagnetic wave signal to the first receiving channel 41 through the first synthesizer 31. The second electromagnetic wave signal is the electromagnetic wave signal reflected by the interference object when the other radar antennas in the first radar antenna subarray 11 and the second radar antenna subarray 12 except the second radar antenna do not transmit the electromagnetic wave detection signal to the target. The first receiving channel 41 receives the second electromagnetic wave signal, performs analog-to-digital conversion on the second electromagnetic wave signal, obtains the second digital electromagnetic wave signal, and transmits the second digital electromagnetic wave signal to the processor 50.

[0058] The third radar antenna subarray 13 and the fourth radar antenna subarray 14 transmit electromagnetic wave detection signals to the target, respectively receive echo signals C and D reflected by the target, and respectively transmit the echo signals C and D to the second synthesizer 32. The second synthesizer 32 receives the echo signals C and D, synthesizes the received echo signals to obtain an echo signal (C+D), and transmits it to the second receiving channel 42. The second receiving channel 42 receives the echo signal (C+D), performs analog-to-digital conversion processing on the received echo signal to obtain a digital echo signal (C+D), and transmits the digital echo signal (C+D) to the processor 50.

[0059] The processor 50 receives the second digital electromagnetic wave signal and the digital echo signal (C+D), and performs sidelobe blanking processing on the digital echo signal (C+D) according to the second digital electromagnetic wave signal.

[0060] Since there will be main lobes and side lobes in the digital echo signal (C+D), in an embodiment of the present application, by performing sidelobe blanking processing on the digital echo signal (C+D) based on the second digital electromagnetic wave signal, the accuracy of the determined target position information can be improved, and the anti-interference ability and target detection ability of the radar antenna measurement system 1 can be improved.

[0061] In some embodiments, the wave controller 20 also controls the third radar antenna in the third radar antenna subarray 13 and the fourth radar antenna subarray 14 to be in a closed state. The third radar antenna is one or more radar antennas in the third radar antenna subarray 13 and the fourth radar antenna subarray 14. The third radar antenna can be determined as needed and is not limited here. The wave controller 20 also controls the other radar antennas in the third radar antenna subarray 13 and the fourth radar antenna subarray 14 except the third radar antenna to receive the third electromagnetic wave signal, and transmits the third electromagnetic wave signal to the second receiving channel 42 through the second synthesizer 32. The third electromagnetic wave signal is the electromagnetic wave signal reflected by the interference object when the other radar antennas in the third radar antenna subarray 13 and the fourth radar antenna subarray 14 except the third radar antenna do not transmit the electromagnetic wave detection signal to the target. The second receiving channel 42 receives the third electromagnetic wave signal, performs analog-to-digital conversion on the third electromagnetic wave signal, obtains the third digital electromagnetic wave signal, and transmits the third digital electromagnetic wave signal to the processor 50.

[0062] The first radar antenna subarray 11 and the second radar antenna subarray 12 transmit electromagnetic wave detection signals to the target, respectively receive echo signals A and B reflected by the target, and transmit the echo signals A and B to the first synthesizer 31. The first synthesizer 31 receives the echo signals A and B, synthesizes the received echo signals to obtain an echo signal (A+B), and transmits it to the first receiving channel 41. The first receiving channel 41 receives the echo signal (A+B), performs analog-to-digital conversion processing on the received echo signal to obtain a digital echo signal (A+B), and transmits the digital echo signal (A+B) to the processor 50.

[0063] The processor 50 receives the third digital electromagnetic wave signal and the digital echo signal (A+B), and performs sidelobe blanking processing on the digital echo signal (A+B) according to the third digital electromagnetic wave signal.

[0064] Since there will be main lobes and side lobes in the digital echo signal (A+B), in an embodiment of the present application, by performing sidelobe blanking processing on the digital echo signal (A+B) based on the second digital electromagnetic wave signal, the accuracy of the determined target position information can be improved, and the anti-interference ability and target detection ability of the radar antenna measurement system 1 can be improved.

[0065] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known structures and technologies are not shown in detail so as not to obscure the understanding of this description.

[0066] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the above description of the exemplary embodiments of the present application, the various features of the embodiments of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed structure should not be interpreted as reflecting the following intention: that the claimed application requires more features than those explicitly recited in each claim.

[0067] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0068] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present application may be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A radar antenna measurement system, characterized in that: The system includes a radar antenna array composed of multiple radar antenna subarrays, a beam controller, a synthesizer, a signal receiving channel and a processor, wherein: Each of the radar antenna subarrays is used to transmit an electromagnetic wave detection signal to a target and receive a first echo signal reflected by the target; The wave controller is used to perform phase change processing on the phase of part of the first echo signal to obtain a processed echo signal; The radar antenna subarray is also used to transmit the processed echo signal and the echo signal in the first echo signal that has not been processed by the wave controller to the synthesizer; The synthesizer is used to receive the echo signal sent by the radar antenna subarray, perform synthesis processing on the received echo signal to obtain a second echo signal, and transmit the second echo signal to the signal receiving channel; The signal receiving channel is used to receive the second echo signal, perform analog-to-digital conversion processing on the second echo signal to obtain a first digital echo signal, and transmit the first digital echo signal to the processor; The processor is used to receive the first digital echo signal, and measure and determine the position information of the target according to the first digital echo signal.

2. The system according to claim 1, characterized in that The system includes four radar antenna subarrays, and the four radar antenna subarrays form a 2×2 array.

3. The system according to claim 2, characterized in that The echo signals transmitted by the four radar antenna subarrays to the synthesizer are A, B, C and D respectively, and are all positive-phase echo signals; The processor is used to measure and determine the distance information and speed information of the target according to the first digital echo signal (A+B+C+D).

4. The system according to claim 2, characterized in that The echo signals transmitted by the four radar antenna subarrays to the synthesizer are A, B, -C and -D respectively, A and B are positive phase echo signals, and -C and -D are negative phase echo signals; The radar antenna subarray that transmits echo signals A and B is located in the first row of the 2×2 array, and the radar antenna subarray that transmits echo signals A and -C is located in the first column of the 2×2 array; The processor is used for measuring and determining the pitch angle of the target according to the first digital echo signal (A+B-(C+D)).

5. The system according to claim 2, characterized in that The echo signals transmitted by the four radar antenna subarrays to the synthesizer are A, -B, C and -D respectively, A and C are positive phase echo signals, and -B and -D are negative phase echo signals; The radar antenna subarray that transmits echo signals A and -B is located in the first row of the 2×2 array, and the radar antenna subarray that transmits echo signals A and C is located in the first column of the 2×2 array; The processor is used for measuring and determining the azimuth of the target according to the first digital echo signal (A+C-(B+D)).

6. The system according to claim 1, characterized in that The processor is further configured to store the first digital echo signal; The wave controller is also used to control the first radar antenna in the radar antenna array to be in a closed state, and the other radar antennas in the radar antenna array except the first radar antenna are used to receive a first electromagnetic wave signal, and transmit the first electromagnetic wave signal to the signal receiving channel through the synthesizer; The signal receiving channel is used to receive the first electromagnetic wave signal, perform analog-to-digital conversion on the first electromagnetic wave signal to obtain a first digital electromagnetic wave signal, and transmit the first digital electromagnetic wave signal to the processor; The processor is used to receive the first digital electromagnetic wave signal, and perform sidelobe blanking processing on the first digital echo signal according to the first digital electromagnetic wave signal.

7. The system according to claim 2, characterized in that The synthesizer includes a first synthesizer and a second synthesizer, and the signal receiving channel includes a first receiving channel and a second receiving channel; The four radar antenna subarrays are respectively a first radar antenna subarray, a second radar antenna subarray, a third radar antenna subarray and a fourth radar antenna subarray, the first radar antenna subarray and the second radar antenna subarray are located in the first row of the 2×2 array, and the first radar antenna subarray and the third radar antenna subarray are located in the first column of the 2×2 array; the first echo signal includes a first sub-echo signal and a second sub-echo signal, the first sub-echo signal is an echo signal received by the first radar antenna subarray and the second radar antenna subarray, and the second sub-echo signal is an echo signal received by the third radar antenna subarray and the fourth radar antenna subarray; The first radar antenna subarray and the second radar antenna subarray are used to transmit the echo signal in the first sub-echo signal that has been processed by the wave controller and the echo signal in the first sub-echo signal that has not been processed by the wave controller to the first synthesizer; The third radar antenna subarray and the fourth radar antenna subarray are used to transmit the echo signal in the second sub-echo signal that has been processed by the wave controller and the echo signal in the second sub-echo signal that has not been processed by the wave controller to the second synthesizer; The first synthesizer is used for receiving echo signals sent by the first radar antenna subarray and the second radar antenna subarray, performing synthesis processing on the received echo signals to obtain a third echo signal, and transmitting the third echo signal to the first receiving channel; The second synthesizer is used to receive the echo signals sent by the third radar antenna subarray and the fourth radar antenna subarray, perform synthesis processing on the received echo signals to obtain a fourth echo signal, and transmit the fourth echo signal to the second receiving channel; The first receiving channel is used to receive the third echo signal, perform analog-to-digital conversion on the third echo signal to obtain a second digital echo signal, and transmit the second digital echo signal to the processor; The second receiving channel is used to receive the fourth echo signal, perform analog-to-digital conversion on the fourth echo signal to obtain a third digital echo signal, and transmit the third digital echo signal to the processor; The processor is used to receive the second digital echo signal and the third digital echo information, synthesize the second digital echo signal and the third digital echo signal to obtain a fourth digital echo signal, and measure and determine the position information of the target according to the fourth digital echo signal.

8. The system according to claim 7, characterized in that The echo signal transmitted by the first radar antenna subarray to the first synthesizer is A; The echo signals transmitted by the second radar antenna subarray to the first synthesizer include B and -B, wherein the echo signal -B is a signal obtained after the wave controller performs phase change processing on the echo signal B; The echo signal transmitted by the third radar antenna subarray to the second synthesizer is C; The echo signals transmitted by the fourth radar antenna subarray to the second synthesizer include D and -D, wherein the echo signal -D is a signal obtained after the wave controller performs phase change processing on the echo signal D; When the third echo signal is (A+B) and the fourth echo signal is (C+D), the processor is used to measure and determine the distance information and speed information of the target according to the first fourth digital echo signal (A+B+C+D), synthesize the fifth echo signal -(C+D) according to the fourth echo signal C+D, and measure and determine the pitch angle of the target according to the second fourth digital echo signal (A+B-(C+D)); When the third echo signal is AB and the fourth echo signal is CD, the processor is used to measure and determine the azimuth of the target according to the third fourth digital echo signal (A+C-(B+D)).

9. The system according to claim 7, characterized in that The echo signals transmitted by the first radar antenna subarray and the second radar antenna subarray to the first synthesizer are A and B respectively; The echo signal transmitted by the third radar antenna subarray to the second synthesizer is C; The echo signals transmitted by the fourth radar antenna subarray to the second synthesizer include D and -D, wherein the echo signal -D is a signal obtained after the wave controller performs phase change processing on the echo signal D; When the third echo signal is (A+B) and the fourth echo signal is (C+D), the processor is used to measure and determine the distance information and speed information of the target according to the first fourth digital echo signal (A+B+C+D), synthesize the fifth echo signal -(C+D) according to the fourth echo signal (C+D), and measure and determine the pitch angle of the target according to the second fourth digital echo signal (A+B-(C+D)); When the third echo signal is (A+B) and the fourth echo signal is (CD), the processor is also used to obtain the echo signal (A'-B') according to the phase difference fitting between the echo signal (A+B) and the echo signal (CD), and measure and determine the azimuth of the target according to the third and fourth digital echo signals (A+B) and (A'-B').

10. The system according to claim 7, characterized in that The wave controller is used to control the second radar antenna in the first radar antenna subarray and the second radar antenna subarray to be in a closed state; The first radar antenna subarray and the other radar antennas in the second radar antenna subarray except the second radar antenna are used to receive a second electromagnetic wave signal, and transmit the second electromagnetic wave signal to the first receiving channel through the first synthesizer; The first receiving channel is used to receive the second electromagnetic wave signal, perform analog-to-digital conversion on the second electromagnetic wave signal to obtain a second digital electromagnetic wave signal, and transmit the second digital electromagnetic wave signal to the processor; The processor is used to receive the second digital electromagnetic wave signal, and perform sidelobe blanking processing on the fourth digital echo signal according to the second digital electromagnetic wave signal; Alternatively, the wave controller is used to control the third radar antenna subarray and the third radar antenna in the fourth radar antenna subarray to be in a closed state; The third radar antenna subarray and other radar antennas in the fourth radar antenna subarray except the third radar antenna are used to receive a third electromagnetic wave signal, and transmit the third electromagnetic wave signal to the second receiving channel through the second synthesizer; The second receiving channel is used to receive the third electromagnetic wave signal, perform analog-to-digital conversion on the third electromagnetic wave signal to obtain a third digital electromagnetic wave signal, and transmit the third digital electromagnetic wave signal to the processor; The processor is used to receive the third digital electromagnetic wave signal, and perform sidelobe blanking processing on the fourth digital echo signal according to the third digital electromagnetic wave signal.

Images