Wide beam, large bandwidth, high precision direction finding device and method

Abstract

The present invention discloses a wide-beam, large-bandwidth, high-precision direction-finding device and method, comprising: a signal acquisition chassis and a signal processing chassis. The signal acquisition chassis is provided with four digital signal acquisition and processing boards, namely, a first digital signal acquisition and processing board, a second digital signal acquisition and processing board, a third digital signal acquisition and processing board, and a fourth digital signal acquisition and processing board; the signal processing chassis comprises: a first beamforming board, a second beamforming board, a third beamforming board, a first signal sorting and measuring board, and a second signal sorting and measuring board. The wide-beam, large-bandwidth, high-precision direction-finding device and method provided by the present invention can achieve direction-finding indicators with a direction-finding accuracy better than 1°, a direction-finding sensitivity better than ‑100dBm, an instantaneous angle measurement range of not less than 20°, and an instantaneous reconnaissance bandwidth of not less than 4GHz.

Description

Technical Field

[0001] The invention relates to a wide-beam, large-bandwidth, high-precision direction-finding device and method, and belongs to the technical field of radar data processing. Background Art

[0002] Reconnaissance and direction finding is a key core technology in the field of electromagnetic environment monitoring and electronic countermeasures. The core indicators of reconnaissance and direction finding technology are direction finding sensitivity, angle measurement accuracy, instantaneous angle measurement range and instantaneous measurement bandwidth.

[0003] At present, the commonly used technical systems in the field of reconnaissance and direction finding include 4-channel amplitude comparison direction finding, 5-element interferometer system, two-dimensional linear array interferometer, and simultaneous digital multi-beam technology.

[0004] According to engineering experience, the angle measurement accuracy of the 4-channel amplitude comparison direction finding system is usually 1 / 6 of the antenna beam width; the instantaneous angle measurement range is one beam width, and the direction finding sensitivity is negatively correlated with the antenna beam width. Therefore, the 4-channel amplitude comparison direction finding system cannot have the advantages of high angle measurement accuracy, wide instantaneous angle measurement range, and high direction finding sensitivity at the same time. The 5-element interferometer direction finding system is usually used in low frequency bands and has poor sensitivity. The 2D linear array interferometer has high angle measurement accuracy, but its sensitivity is low, and there is a contradiction between the direction finding range and the direction finding accuracy.

[0005] At the same time, the digital multi-beam system has great advantages in direction finding sensitivity, angle measurement accuracy, and instantaneous angle measurement range, but its instantaneous measurement bandwidth is generally narrow, usually below 1 GHz.

[0006] In the military field, especially in the fields of electromagnetic environment monitoring and electronic countermeasures, it is necessary to conduct real-time reconnaissance and direction finding of radar signals on ground radars, shipborne radars, missile seekers and other equipment, obtain parameter information and angle information of target signals, and provide reconnaissance parameters and angle information for jamming equipment. At present, the instantaneous bandwidth of signals of more advanced radar equipment has reached 4GHz, and the instantaneous processing bandwidth of existing electronic countermeasure devices is below 1GHz. How to perform real-time reconnaissance and direction finding of radar equipment with an instantaneous bandwidth of 4GHz is a technical solution that technical personnel in this field urgently need to solve. Summary of the invention

[0007] Purpose: To overcome the deficiencies in the prior art, the present invention provides a wide-beam, large-bandwidth, high-precision direction-finding device and method.

[0008] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:

[0009] In a first aspect, a wide-beam, large-bandwidth, high-precision direction-finding device includes: a signal acquisition chassis and a signal processing chassis.

[0010] The signal acquisition chassis is provided with four digital signal acquisition and processing boards, namely a first digital signal acquisition and processing board, a second digital signal acquisition and processing board, a third digital signal acquisition and processing board and a fourth digital signal acquisition and processing board. Each digital signal acquisition and processing board includes 4 AD converters, each of which is respectively connected to a frequency f1 adjustment module, a frequency f2 adjustment module, a frequency f3 adjustment module and a frequency f4 adjustment module; the output ends of the 4 frequency f1 adjustment modules are all connected to the f1 data input end of the beam presynthesis module, the output ends of the 4 frequency f2 adjustment modules are all connected to the f2 data input end of the beam presynthesis module, the output ends of the 4 frequency f3 adjustment modules are all connected to the f3 data input end of the beam presynthesis module, and the output ends of the 4 frequency f4 adjustment modules are all connected to the f4 data input end of the beam presynthesis module; the output ends of the 4 frequency f1 adjustment modules are all connected to the f1 data input end of the frequency selection module, the output ends of the 4 frequency f2 adjustment modules are all connected to the f2 data input end of the frequency selection module, the output ends of the 4 frequency f3 adjustment modules are all connected to the f3 data input end of the frequency selection module, and the output ends of the 4 frequency f4 adjustment modules are all connected to the f4 data input end of the frequency selection module.

[0011] Each AD converter inputs a 4 GHz radar intermediate frequency signal and outputs a high-speed sampling digital signal with an instantaneous bandwidth of 4 GHz.

[0012] The frequency f1 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz.

[0013] The frequency f2 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz.

[0014] The frequency f3 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz.

[0015] The frequency f4 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz.

[0016] The beam presynthesis module multiplies 4 signals with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain 1 signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain 1 signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain 1 signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain 1 signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; and then aggregates the 4 signals with center frequencies of f1, f2, f3, and f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz into a first information packet.

[0017] The frequency selection module aggregates 4 signals with a center frequency of f1, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f1 information packet, aggregates 4 signals with a center frequency of f2, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f2 information packet, aggregates 4 signals with a center frequency of f3, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f3 information packet, and aggregates 4 signals with a center frequency of f4, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f4 information packet, and outputs the center frequency f through the frequency selection switch of the frequency selection module. i Information packet, i is 1, 2, 3, 4.

[0018] The signal processing chassis includes: a first beamforming board, a second beamforming board, a first signal sorting and measuring board, and a second signal sorting and measuring board. The output ends of the four frequency selection modules are respectively connected to the input ends of the first beamforming board and the second beamforming board, and the output ends of the first beamforming board and the second beamforming board are respectively connected to the first signal sorting and measuring board.

[0019] The first beamforming board receives four center frequencies f sent by four digital signal acquisition and processing boards. i Information packet, 4 center frequencies f i There are 16 channels in the information packet with a center frequency of f i, with an interval of 1GHz and an instantaneous bandwidth of 1GHz, i is 1, 2, 3, 4. The upper 500MHz bandwidth data of the 16 1GHz bandwidth signals are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, and j is a natural number of 1-32 to form 32 Nj channel data packets. The signal in each Nj channel data packet is replicated 16 times and coefficient-weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16. Parameters are measured for each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output. The first beamforming board outputs 32×16 groups of signal parameter measurement results in parallel.

[0020] The second beamforming board receives the four center frequencies f sent by the four digital signal acquisition and processing boards. i Information packet, 4 center frequencies f i There are 16 channels in the information packet with a center frequency of f i , with an interval of 1GHz and an instantaneous bandwidth of 1GHz, i is 1, 2, 3, 4. The lower 500MHz bandwidth data of the 16 1GHz bandwidth signals are parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, j is a natural number from 1 to 32, forming 32 Nj channel data packets. The signal in each Nj channel data packet is replicated 16 times and coefficient-weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16. Parameters are measured for each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output. The second beamforming board outputs 32×16 groups of signal parameter measurement results in parallel.

[0021] The first signal sorting and measuring board receives 2×32×16 groups of signal parameter measurement results output by the first beamforming board and the second beamforming board, selects the maximum signal amplitude from the 2×32×16 groups of signal parameter measurement results, and the channel corresponding to the signal amplitude is recorded as N m , according to channel N m The signal amplitude information of the 16 measurement beams is used to calculate the arrival angle information of the radar intermediate frequency signal input to each AD converter using the multi-beam amplitude comparison algorithm, where m∈1-32 is a natural number.

[0022] As a preferred solution, the signal processing chassis also includes: a third beamforming board, a second signal sorting and measuring board, the output ends of the four beam presynthesis modules are all connected to the input end of the third beamforming board, and the output end of the third beamforming board is connected to the second signal sorting and measuring board.

[0023] The third beamforming board receives four groups of first information packets sent by four digital signal acquisition and processing boards. Each group of first information packets contains four signals with center frequencies of f1, f2, f3, and f4, with an interval of 1 GHz and an instantaneous bandwidth of 1 GHz. Each of the four signals with center frequencies of f1, f2, f3, and f4, with an interval of 1 GHz, is subjected to sum-difference beamforming to form a center frequency f1. i The sum beam, azimuth difference beam and elevation difference beam are respectively i The beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the sum beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam. i The azimuth difference beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the azimuth difference beam are measured for parameters to obtain the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the azimuth difference beam. i The elevation difference beam is parallelized to 64 channels to obtain the center frequency f i The signals of the 64 channels of the elevation difference beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam. i takes 1, 2, 3, and 4, and the third beamforming board outputs in parallel the frequency, amplitude, pulse width, repetition period, and pulse parameter information of the 4×64 channels of the sum beam, the frequency, amplitude, pulse width, and repetition period information of the 4×64 channels of the azimuth difference beam, and the frequency, amplitude, pulse width, and repetition period information of the 4×64 channels of the elevation difference beam.

[0024] The second signal sorting and measuring board receives the signal parameter measurement data of 4×64 channels of the sum beam, the signal parameter measurement data of 4×64 channels of the azimuth difference beam, and the signal parameter measurement data of 4×64 channels of the elevation difference beam output by the third beam forming board, and calculates the arrival angle information of the radar intermediate frequency signal input to each AD converter by using the sum-difference amplitude ratio algorithm.

[0025] As a preferred solution, the signal parameter measurement results include: signal frequency, amplitude, pulse width, repetition period and intra-pulse parameter information.

[0026] As a preferred solution, the AD converter adopts a 10GSps high-speed sampling rate AD converter.

[0027] In a second aspect, a wide-beam, large-bandwidth, high-precision direction finding method is provided, comprising the following steps:

[0028] Step 1: 16-channel AD converters receive external input 4 GHz radar intermediate frequency signals respectively, and output 16 channels of signals with an instantaneous bandwidth of 4 GHz.

[0029] Step 2: Convert each signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, a signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, and a signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz. A total of 16 signals with a center frequency of f i , the interval is 1GHz, the instantaneous bandwidth is 1GHz, and i is 1, 2, 3, 4.

[0030] Step 3: 4 signals with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are multiplied by the pre-synthesis coefficient respectively and the sum is obtained to obtain 1 signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; 4 signals with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are multiplied by the pre-synthesis coefficient respectively and the sum is obtained to obtain 1 signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; 4 signals with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are multiplied by the pre-synthesis coefficient respectively and the sum is obtained to obtain 1 signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; 4 signals with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are multiplied by the pre-synthesis coefficient respectively and the sum is obtained to obtain 1 signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; then the 4 signals with center frequencies of f1, f2, f3, and f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into the first information packet. Repeat the above operation to obtain 4 first information packets in total.

[0031] Step 4: Perform sum and difference beam processing on the signals with the center frequencies of f1, f2, f3, f4, and 1 GHz in each of the four groups of first information packets to form a center frequency f i The sum beam, azimuth difference beam and elevation difference beam are respectively i The beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the sum beam are measured, and the center frequency f is obtained. iThe frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam are calculated. i The azimuth difference beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the azimuth difference beam are measured for parameters to obtain the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the azimuth difference beam. i The elevation difference beam is parallelized to 64 channels to obtain the center frequency f i The signals of the 64 channels of the elevation difference beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam, i is 1, 2, 3, or 4.

[0032] Step 5: According to the center frequency fi and the frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam, the center frequency fi azimuth difference beam has the frequency, amplitude, pulse width, repetition period information of each signal in the 64 channels, and the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam, i takes 1, 2, 3, and 4, and the arrival angle information of the radar intermediate frequency signal input to each AD converter is calculated using the sum-difference ratio algorithm.

[0033] As a preferred solution, it also includes:

[0034] Step 6: The 4 signals with center frequency f1, interval 1GHz, and instantaneous bandwidth of 1GHz are aggregated into a center frequency f1 information packet, the 4 signals with center frequency f2, interval 1GHz, and instantaneous bandwidth of 1GHz are aggregated into a center frequency f2 information packet, the 4 signals with center frequency f3, interval 1GHz, and instantaneous bandwidth of 1GHz are aggregated into a center frequency f3 information packet, and the 4 signals with center frequency f4, interval 1GHz, and instantaneous bandwidth of 1GHz are aggregated into a center frequency f4 information packet. Repeat the above operation to obtain a total of 4 center frequency f i Information packet, i is 1, 2, 3, 4.

[0035] Step 7: Pack the 16 channels with center frequencies f in the 4 center frequency fi packets respectively. i, the upper 500MHz bandwidth data of the signal with an interval of 1GHz and an instantaneous bandwidth of 1GHz are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, with j taking a natural number of 1-32 to form 32 Nj channel data packets. The signal in each Nj channel data packet is replicated 16 times and coefficient weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16, and the parameters of each measurement beam of the Nj channel are measured, and 16 groups of signal parameter measurement results are output, and a total of 32×16 groups of signal parameter measurement results are output in parallel.

[0036] Step 8: Set the four center frequencies f i The center frequency of the 16 channels in the information packet is f i , the lower 500MHz bandwidth data of the signal with an interval of 1GHz and an instantaneous bandwidth of 1GHz are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, with j taking a natural number of 1-32 to form 32 Nj channel data packets. The signal in each Nj channel data packet is replicated 16 times and coefficient weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16, and the parameters of each measurement beam of the Nj channel are measured, and 16 groups of signal parameter measurement results are output, and a total of 32×16 groups of signal parameter measurement results are output in parallel.

[0037] Step 9: Select the maximum signal amplitude from the two groups of 32×16 signal parameter measurement results. The channel corresponding to the signal amplitude is recorded as N. m , according to channel N m The signal amplitude information of the 16 measurement beams is used to calculate the arrival angle information of the radar intermediate frequency signal input to each AD converter using the multi-beam amplitude comparison algorithm, where m∈1-32 is a natural number.

[0038] As a preferred solution, the signal parameter measurement results include: signal frequency, amplitude, pulse width, repetition period and intra-pulse parameter information.

[0039] As a preferred solution, the AD converter adopts a 10GSps high-speed sampling rate AD converter.

[0040] Beneficial effects: The wide-beam, large-bandwidth, high-precision direction-finding device and method provided by the present invention can achieve direction-finding indicators with a direction-finding accuracy better than 1°, a direction-finding sensitivity better than -100dBm, an instantaneous angle-measuring range of not less than 20°, and an instantaneous reconnaissance bandwidth of not less than 4GHz. Its advantages are as follows:

[0041] 1) It has the ability to simultaneously widen the airspace and receive with high sensitivity. The first beamforming board and the second beamforming board use simultaneous digital multi-beam technology to achieve instantaneous wide coverage of the airspace; the third beamforming board receives the signal power of all channels, so it has high-sensitivity receiving capability.

[0042] 2) It has the capability to simultaneously perform instantaneous wide-space direction finding and high-precision tracking.

[0043] 3) It has two working modes: airspace guiding frequency domain and frequency domain guiding airspace.

[0044] 4) Reduce the performance requirements for hardware devices. The first beamforming board and the second beamforming board receive the same data (1GHz bandwidth) and process 500MHz bandwidth data respectively, which reduces the requirements for hardware resources of the simultaneous digital multi-beamforming signal processing algorithm. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the structure of the direction finding device of the present invention.

[0046] Figure 2 It is a structural schematic diagram taking the first digital signal acquisition and processing board of the present invention as an example. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with specific embodiments.

[0048] Embodiment 1:

[0049] like Figure 1-2 As shown, a wide-beam, large-bandwidth, high-precision direction-finding device comprises: a signal acquisition chassis and a signal processing chassis.

[0050] The signal acquisition chassis is provided with four digital signal acquisition and processing boards, namely a first digital signal acquisition and processing board, a second digital signal acquisition and processing board, a third digital signal acquisition and processing board and a fourth digital signal acquisition and processing board. Each digital signal acquisition and processing board includes four 10GSps high-speed sampling rate AD converters, each of which is connected to a frequency f1 adjustment module, a frequency f2 adjustment module, a frequency f3 adjustment module and a frequency f4 adjustment module respectively; the output ends of the four frequency f1 adjustment modules are all connected to the f1 data input end of the beam presynthesis module, the output ends of the four frequency f2 adjustment modules are all connected to the f2 data input end of the beam presynthesis module, the output ends of the four frequency f3 adjustment modules are all connected to the f3 data input end of the beam presynthesis module, and the output ends of the four frequency f4 adjustment modules are all connected to the f4 data input end of the beam presynthesis module; the output ends of the four frequency f1 adjustment modules are all connected to the f1 data input end of the frequency selection module, the output ends of the four frequency f2 adjustment modules are all connected to the f2 data input end of the frequency selection module, the output ends of the four frequency f3 adjustment modules are all connected to the f3 data input end of the frequency selection module, and the output ends of the four frequency f4 adjustment modules are all connected to the f4 data input end of the frequency selection module.

[0051] Each AD converter inputs a 4 GHz radar intermediate frequency signal and outputs a high-speed sampling digital signal with an instantaneous bandwidth of 4 GHz.

[0052] The frequency f1 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz.

[0053] The frequency f2 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz.

[0054] The frequency f3 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz.

[0055] The frequency f4 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz.

[0056] The beam presynthesis module multiplies 4 signals with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain 1 signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain 1 signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain 1 signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain 1 signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; and then aggregates the 4 signals with center frequencies of f1, f2, f3, and f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz into a first information packet.

[0057] The frequency selection module aggregates 4 signals with a center frequency of f1, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f1 information packet, aggregates 4 signals with a center frequency of f2, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f2 information packet, aggregates 4 signals with a center frequency of f3, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f3 information packet, and aggregates 4 signals with a center frequency of f4, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f4 information packet, and outputs the center frequency f through the frequency selection switch of the frequency selection module. i Information packet, i is 1, 2, 3, 4.

[0058] The signal processing chassis comprises: a first beamforming board, a second beamforming board, a third beamforming board, a first signal sorting and measuring board, and a second signal sorting and measuring board. The output ends of four beam presynthesis modules are all connected to the input end of the third beamforming board. The output ends of four frequency selection modules are respectively connected to the input ends of the first beamforming board and the second beamforming board. The output end of the third beamforming board is connected to the second signal sorting and measuring board. The output ends of the first beamforming board and the second beamforming board are respectively connected to the first signal sorting and measuring board.

[0059] The first beamforming board receives four center frequencies f sent by four digital signal acquisition and processing boards. i Information packet, 4 center frequencies f i There are 16 channels in the information packet with a center frequency of f i, with an interval of 1GHz and an instantaneous bandwidth of 1GHz, i is 1, 2, 3, 4. The upper 500MHz bandwidth data of the 16 1GHz bandwidth signals are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, and j is a natural number of 1-32 to form 32 Nj channel data packets. The signal in each Nj channel data packet is replicated 16 times and coefficient-weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16. Parameters are measured for each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output. The signal parameter measurement results include: signal frequency, amplitude, pulse width, repetition period and intra-pulse parameter information. The first beamforming board outputs 32×16 groups of signal parameter measurement data in parallel.

[0060] The second beamforming board receives the four center frequencies f sent by the four digital signal acquisition and processing boards. i Information packet, 4 center frequencies f i There are 16 channels in the information packet with a center frequency of f i , with an interval of 1GHz and an instantaneous bandwidth of 1GHz, i is 1, 2, 3, 4. The lower 500MHz bandwidth data of the 16 1GHz bandwidth signals are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, j is a natural number of 1-32, to form 32 Nj channel data packets. The signal in each Nj channel data packet is replicated 16 times and coefficient-weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16, and each measurement beam of the Nj channel is measured for parameters, and 16 groups of signal parameter measurement results are output. The signal parameter measurement results include: signal frequency, amplitude, pulse width, repetition period and intra-pulse parameter information. The second beamforming board outputs 32×16 groups of signal parameter measurement data in parallel.

[0061] The third beamforming board receives four groups of first information packets sent by four digital signal acquisition and processing boards. Each group of first information packets contains four signals with center frequencies of f1, f2, f3, and f4, with an interval of 1 GHz and an instantaneous bandwidth of 1 GHz. Each of the four signals with center frequencies of f1, f2, f3, and f4, with an interval of 1 GHz, is subjected to sum-difference beamforming to form a center frequency f1. i The sum beam, azimuth difference beam and elevation difference beam are respectively i The beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the sum beam are measured, and the center frequency f is obtained. iThe frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam. i The azimuth difference beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the azimuth difference beam are measured for parameters to obtain the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the azimuth difference beam. i The elevation difference beam is parallelized to 64 channels to obtain the center frequency f i The signals of the 64 channels of the elevation difference beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam. i takes 1, 2, 3, and 4, and the third beamforming board outputs in parallel the frequency, amplitude, pulse width, repetition period, and pulse parameter information of the 4×64 channels of the sum beam, the frequency, amplitude, pulse width, and repetition period information of the 4×64 channels of the azimuth difference beam, and the frequency, amplitude, pulse width, and repetition period information of the 4×64 channels of the elevation difference beam.

[0062] The first signal sorting and measuring board receives 2×32×16 groups of signal parameter measurement data output by the first beamforming board and the second beamforming board, selects the maximum signal amplitude from the 2×32×16 groups of signal parameter measurement data, and the channel corresponding to the signal amplitude is recorded as N m , according to channel N m The signal amplitude information of the 16 measurement beams is used to calculate the arrival angle information of the radar intermediate frequency signal input to each AD converter using the multi-beam amplitude comparison algorithm, where m∈1-32 is a natural number.

[0063] The second signal sorting and measuring board receives the signal parameter measurement data of 4×64 channels of the sum beam, the signal parameter measurement data of 4×64 channels of the azimuth difference beam, and the signal parameter measurement data of 4×64 channels of the elevation difference beam output by the third beam forming board, and calculates the arrival angle information of the radar intermediate frequency signal input to each AD converter by using the sum-difference ratio algorithm. The arrival angle information output by the second signal sorting and measuring board is used for tracking the target.

[0064] The third beamforming board outputs in parallel the frequency, amplitude, pulse width, repetition period and intra-pulse parameter information of the 4×64 channel signals of the sum beam, the frequency, amplitude, pulse width and repetition period information of the 4×64 channel signals of the azimuth difference beam, and the frequency, amplitude, pulse width and repetition period information of the 4×64 channel signals of the elevation difference beam, so as to realize the measurement of the signal parameters of the radar intermediate frequency signal with an instantaneous bandwidth of 4 GHz.

[0065] The sum-difference beam angle measurement technology adopted by the third beamforming board has the characteristics of small angle measurement range and high angle measurement accuracy. Therefore, in this working mode, the first beamforming board and the second beamforming board complete the signal arrival angle measurement within a wide spatial coverage range, and transmit the angle measurement information to the third beamforming board, guiding the third beamforming board to quickly establish an initial tracking angle for the target, and use the sum-difference beam direction finding technology to complete high-precision tracking and direction finding of the target.

[0066] The first beamforming board and the second beamforming board construct a spatial wide-open direction finding mode based on simultaneous digital multi-beam technology. Its instantaneous coverage of the spatial domain is wide, and the single instantaneous direction finding bandwidth is only 1GHz; the data received by the third beamforming board includes the sampling data of all channels, and the sum beam data has a complete 4GHz signal bandwidth. In this mode, the third beamforming board first completes the frequency measurement of the target, and the measurement information is transmitted to the first beamforming board and the second beamforming board, guiding the first beamforming board and the second beamforming board to quickly establish the direction finding process in the 1GHz frequency band and output the target angle measurement information.

[0067] Embodiment 2:

[0068] A wide-beam, large-bandwidth, high-precision direction finding method comprises the following steps:

[0069] Step 1: 16-channel AD converters receive external input 4 GHz radar intermediate frequency signals respectively, and output 16 channels of 10 GHz high-speed sampling signals with an instantaneous bandwidth of 4 GHz.

[0070] Step 2: Convert each signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, a signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, and a signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz. A total of 16 signals with a center frequency of f i , the interval is 1GHz, the instantaneous bandwidth is 1GHz, and i is 1, 2, 3, 4.

[0071] Step 3: 4 signals with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are multiplied by the pre-synthesis coefficient respectively and the sum is obtained to obtain 1 signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; 4 signals with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are multiplied by the pre-synthesis coefficient respectively and the sum is obtained to obtain 1 signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; 4 signals with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are multiplied by the pre-synthesis coefficient respectively and the sum is obtained to obtain 1 signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; 4 signals with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are multiplied by the pre-synthesis coefficient respectively and the sum is obtained to obtain 1 signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; then the 4 signals with center frequencies of f1, f2, f3, and f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into the first information packet. Repeat the above operation to obtain 4 first information packets in total.

[0072] Step 4: Perform sum and difference beam processing on the signals with the center frequencies of f1, f2, f3, f4, and 1 GHz in each of the four groups of first information packets to form a center frequency f i The sum beam, azimuth difference beam and elevation difference beam are respectively i The beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the sum beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam are calculated. i The azimuth difference beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the azimuth difference beam are measured for parameters to obtain the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the azimuth difference beam. i The elevation difference beam is parallelized to 64 channels to obtain the center frequency f i The signals of the 64 channels of the elevation difference beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam, i is 1, 2, 3, or 4.

[0073] Step 5: According to the center frequency f iThe frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam, the center frequency f i The frequency, amplitude, pulse width, repetition period information of each signal in the 64 channels of the azimuth difference beam, the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam, i takes 1, 2, 3, and 4, and the arrival angle information of the radar intermediate frequency signal input to each AD converter is calculated using the sum-difference ratio algorithm.

[0074] Preferably, step 6: 4 signals with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a center frequency f1 information package, 4 signals with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a center frequency f2 information package, 4 signals with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a center frequency f3 information package, and 4 signals with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a center frequency f4 information package. Repeat the above operation to obtain 4 center frequencies f i Information packet, i is 1, 2, 3, 4.

[0075] Step 7: Set the four center frequencies f i The center frequency of the 16 channels in the information packet is f i , the upper 500MHz bandwidth data of the signal with an interval of 1GHz and an instantaneous bandwidth of 1GHz are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, and j takes a natural number of 1-32 to form 32 Nj channel data packets. The signal in each Nj channel data packet is replicated 16 times and coefficient weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16. Parameters are measured for each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output, and a total of 32×16 groups of signal parameter measurement data are output in parallel. The signal parameter measurement results include: signal frequency, amplitude, pulse width, repetition period and intra-pulse parameter information.

[0076] Step 8: Set the four center frequencies f i The center frequency of the 16 channels in the information packet is f i, the lower 500MHz bandwidth data of the signal with an interval of 1GHz and an instantaneous bandwidth of 1GHz are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, with j taking a natural number of 1-32 to form 32 Nj channel data packets. The signal in each Nj channel data packet is replicated 16 times and coefficient weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16. Parameters are measured for each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output, and a total of 32×16 groups of signal parameter measurement data are output in parallel. The signal parameter measurement results include: signal frequency, amplitude, pulse width, repetition period and intra-pulse parameter information.

[0077] Step 9: Select the maximum signal amplitude from the two groups of 32×16 signal parameter measurement data. The channel corresponding to the signal amplitude is recorded as N. m , according to channel N m The signal amplitude information of the 16 measurement beams is used to calculate the arrival angle information of the radar intermediate frequency signal input to each AD converter using the multi-beam amplitude comparison algorithm, where m∈1-32 is a natural number.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A wide-beam, large-bandwidth, high-precision direction-finding device, characterized in that: include: Signal acquisition chassis, signal processing chassis; The signal acquisition chassis is equipped with 4 digital signal acquisition and processing boards, each of which inputs a 4GHz radar intermediate frequency signal and outputs a center frequency f i Information packet, i takes 1, 2, 3, 4; The signal processing chassis includes: a first beamforming board, a second beamforming board, a first signal sorting and measuring board, and a second signal sorting and measuring board. The output ends of the four digital signal acquisition and processing boards are respectively connected to the input ends of the first beamforming board and the second beamforming board, and the output ends of the first beamforming board and the second beamforming board are respectively connected to the first signal sorting and measuring board. The first beamforming board receives four center frequencies f sent by four digital signal acquisition and processing boards. i Information packet, 4 center frequencies f i There are 16 channels in the information packet with a center frequency of f i , with an interval of 1GHz and an instantaneous bandwidth of 1GHz, i is 1, 2, 3, 4; the upper 500MHz bandwidth data of the 16 1GHz bandwidth signals are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, j is a natural number of 1-32, and 32 Nj channel data packets are formed; the signal in each Nj channel data packet is replicated 16 times and coefficient weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16, and parameter measurement is performed on each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output. The first beamforming board outputs 32×16 groups of signal parameter measurement results in parallel; The second beamforming board receives the four center frequencies f sent by the four digital signal acquisition and processing boards. i Information packet, 4 center frequencies f i There are 16 channels in the information packet with a center frequency of f i , with an interval of 1GHz and an instantaneous bandwidth of 1GHz, i is 1, 2, 3, 4; the lower 500MHz bandwidth data of the 16 1GHz bandwidth signals are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, j is a natural number of 1-32, and 32 Nj channel data packets are formed; the signal in each Nj channel data packet is replicated 16 times and coefficient weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16, and parameter measurement is performed on each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output. The second beamforming board outputs 32×16 groups of signal parameter measurement results in parallel; The first signal sorting and measuring board receives 2×32×16 groups of signal parameter measurement results output by the first beamforming board and the second beamforming board, selects the maximum signal amplitude from the 2×32×16 groups of signal parameter measurement results, and the channel corresponding to the signal amplitude is recorded as N m , according to channel N m The signal amplitude information of the 16 measurement beams is used to calculate the arrival angle information of the radar intermediate frequency signal input to each AD converter using the multi-beam amplitude comparison algorithm, where m∈1-32 is a natural number.

2. The wide-beam, large-bandwidth, high-precision direction-finding device according to claim 1, characterized in that: Each digital signal acquisition and processing board includes 4 AD converters, each of which is connected to a frequency f1 adjustment module, a frequency f2 adjustment module, a frequency f3 adjustment module and a frequency f4 adjustment module, respectively; the output ends of the 4 frequency f1 adjustment modules are all connected to the f1 data input end of the beam presynthesis module, the output ends of the 4 frequency f2 adjustment modules are all connected to the f2 data input end of the beam presynthesis module, the output ends of the 4 frequency f3 adjustment modules are all connected to the f3 data input end of the beam presynthesis module, and the output ends of the 4 frequency f4 adjustment modules are all connected to the f4 data input end of the beam presynthesis module; the output ends of the 4 frequency f1 adjustment modules are all connected to the f1 data input end of the frequency selection module, the output ends of the 4 frequency f2 adjustment modules are all connected to the f2 data input end of the frequency selection module, the output ends of the 4 frequency f3 adjustment modules are all connected to the f3 data input end of the frequency selection module, and the output ends of the 4 frequency f4 adjustment modules are all connected to the f4 data input end of the frequency selection module; Each AD converter inputs a 4GHz radar intermediate frequency signal and outputs a high-speed sampling digital signal with an instantaneous bandwidth of 4GHz; The frequency f1 adjustment module converts a signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; The frequency f2 adjustment module converts the signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; The frequency f3 adjustment module converts the signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; The frequency f4 adjustment module converts the signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; The beam presynthesis module multiplies 4 signals with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain a signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain a signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; multiplies 4 signals with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficient and then sums them to obtain a signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; and then aggregates the 4 signals with center frequencies of f1, f2, f3, and f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz into a first information packet; The frequency selection module aggregates 4 signals with a center frequency of f1, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f1 information packet, aggregates 4 signals with a center frequency of f2, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f2 information packet, aggregates 4 signals with a center frequency of f3, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f3 information packet, and aggregates 4 signals with a center frequency of f4, an interval of 1GHz, and an instantaneous bandwidth of 1GHz into a center frequency f4 information packet, and outputs the center frequency f through the frequency selection switch of the frequency selection module. i Information packet, i is 1, 2, 3, 4.

3. The wide-beam, large-bandwidth, high-precision direction-finding device according to claim 2, characterized in that: The signal processing chassis further includes: a third beam forming board and a second signal sorting and measuring board, the output ends of the four beam presynthesis modules are all connected to the input end of the third beam forming board, and the output end of the third beam forming board is connected to the second signal sorting and measuring board; The third beamforming board receives four groups of first information packets sent by four digital signal acquisition and processing boards. Each group of first information packets contains four signals with center frequencies of f1, f2, f3, and f4, with an interval of 1 GHz and an instantaneous bandwidth of 1 GHz. Each of the four signals with center frequencies of f1, f2, f3, and f4, with an interval of 1 GHz, is subjected to sum-difference beamforming to form a center frequency f1. i The sum beam, azimuth difference beam and elevation difference beam are respectively i The beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the sum beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam; respectively, the center frequency f i The azimuth difference beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the azimuth difference beam are measured for parameters to obtain the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the azimuth difference beam; respectively, the center frequency f i The elevation difference beam is parallelized to 64 channels to obtain the center frequency f i The signals of the 64 channels of the elevation difference beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam; i takes 1, 2, 3, and 4, and the third beamforming board outputs in parallel the frequency, amplitude, pulse width, repetition period, and pulse parameter information of the signals of the 4×64 channels of the sum beam, the frequency, amplitude, pulse width, and repetition period information of the signals of the 4×64 channels of the azimuth difference beam, and the frequency, amplitude, pulse width, and repetition period information of the signals of the 4×64 channels of the elevation difference beam; The second signal sorting and measuring board receives the signal parameter measurement data of 4×64 channels of the sum beam, the signal parameter measurement data of 4×64 channels of the azimuth difference beam, and the signal parameter measurement data of 4×64 channels of the elevation difference beam output by the third beam forming board, and calculates the arrival angle information of the radar intermediate frequency signal input to each AD converter by using the sum-difference amplitude ratio algorithm.

4. The wide-beam, large-bandwidth, high-precision direction-finding device according to claim 1, characterized in that: The signal parameter measurement results include: signal frequency, amplitude, pulse width, repetition period and intra-pulse parameter information.

5. The wide-beam, large-bandwidth, high-precision direction-finding device according to claim 2, characterized in that: The AD converter adopts a 10GSps high-speed sampling rate AD converter.

6. A wide-beam, large-bandwidth, high-precision direction finding method, characterized in that: The steps include: Step 1: 16-channel AD converters receive external input 4GHz radar intermediate frequency signals respectively, and output 16-channel signals with an instantaneous bandwidth of 4GHz; Step 2: Convert each signal with an instantaneous bandwidth of 4 GHz into a signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, a signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz, and a signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz; a total of 16 signals with a center frequency of f i , the interval is 1GHz, the instantaneous bandwidth is 1GHz, i is 1, 2, 3, 4; Step 3: Multiply the 4 signals with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficients and sum them to obtain a signal with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz. Multiply the 4 signals with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficients and sum them to obtain a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz. Multiply the 4 signals with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz by the presynthesis coefficients and sum them to obtain a signal with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz. The presynthesis coefficients are multiplied and summed to obtain a signal with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz. The four signals with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are respectively multiplied by the presynthesis coefficients and summed to obtain a signal with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz. Then, the four signals with center frequencies of f1, f2, f3, and f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a first information packet. Repeat the above operation to obtain a total of four first information packets. Step 4: Perform sum and difference beam processing on the signals with the center frequencies of f1, f2, f3, f4, and 1 GHz in each of the four groups of first information packets to form a center frequency f i The sum beam, azimuth difference beam and elevation difference beam are respectively i The beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the sum beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam are calculated; and the center frequency f i The azimuth difference beam is parallelized to 64 channels to obtain the center frequency f i The 64-channel signals of the azimuth difference beam are measured for parameters to obtain the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the azimuth difference beam are respectively i The elevation difference beam is parallelized to 64 channels to obtain the center frequency f i The signals of the 64 channels of the elevation difference beam are measured, and the center frequency f is obtained. i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam, i is 1, 2, 3, 4; Step 5: According to the center frequency fi and the frequency, amplitude, pulse width, repetition period and pulse parameter information of each signal in the 64 channels of the beam, the center frequency fi azimuth difference beam has the frequency, amplitude, pulse width, repetition period information of each signal in the 64 channels, and the center frequency f i The frequency, amplitude, pulse width, and repetition period information of each signal in the 64 channels of the elevation difference beam, i takes 1, 2, 3, and 4, and the arrival angle information of the radar intermediate frequency signal input to each AD converter is calculated using the sum-difference amplitude ratio algorithm.

7. The wide-beam, large-bandwidth, high-precision direction finding method according to claim 6, characterized in that: Also includes: Step 6: The 4 signals with a center frequency of f1, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a center frequency f1 information packet, the 4 signals with a center frequency of f2, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a center frequency f2 information packet, the 4 signals with a center frequency of f3, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a center frequency f3 information packet, and the 4 signals with a center frequency of f4, an interval of 1 GHz, and an instantaneous bandwidth of 1 GHz are aggregated into a center frequency f4 information packet; repeat the above operation to obtain a total of 4 center frequencies f i Information packet, i takes 1, 2, 3, 4; Step 7: Set the four center frequencies f i The center frequency of the 16 channels in the information packet is f i , the upper 500MHz bandwidth data of the signal with an interval of 1GHz and an instantaneous bandwidth of 1GHz are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, j takes a natural number of 1-32, to form 32 Nj channel data packets; the signal in each Nj channel data packet is replicated 16 times and coefficient weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16, and parameter measurement is performed on each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output, and a total of 32×16 groups of signal parameter measurement results are output in parallel; Step 8: Set the four center frequencies f i The center frequency of the 16 channels in the information packet is f i , the lower 500MHz bandwidth data of the signal with an interval of 1GHz and an instantaneous bandwidth of 1GHz are respectively parallelized into 32 channels to obtain the signals of channels N1-N32, and the signals of channel Nj are aggregated and packaged, j takes a natural number of 1-32, to form 32 Nj channel data packets; the signal in each Nj channel data packet is replicated 16 times and coefficient weighted to form 16 measurement beams of the Nj channel, namely Beam1-Beam16, and parameter measurement is performed on each measurement beam of the Nj channel, and 16 groups of signal parameter measurement results are output, and a total of 32×16 groups of signal parameter measurement results are output in parallel; Step 9: Select the maximum signal amplitude from the two groups of 32×16 signal parameter measurement results. The channel corresponding to the signal amplitude is recorded as N. m , according to channel N m The signal amplitude information of the 16 measurement beams is used to calculate the arrival angle information of the radar intermediate frequency signal input to each AD converter using the multi-beam amplitude comparison algorithm, where m∈1-32 is a natural number.

8. The wide-beam, large-bandwidth, high-precision direction finding method according to claim 7, characterized in that: The signal parameter measurement results include: signal frequency, amplitude, pulse width, repetition period and intra-pulse parameter information.

9. The wide-beam, large-bandwidth, high-precision direction finding method according to claim 6 or 7, characterized in that: The AD converter adopts a 10GSps high-speed sampling rate AD converter.

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