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Velocity Defuzzification Method Based on Coherent Frequency Agile Radar

A technology of frequency agility and defuzzification, which is applied in the direction of radio wave measurement systems and instruments, can solve problems such as large amount of calculation, influence on target detection results, radar distance-velocity ambiguity, etc., to achieve improved detection capabilities, low interception characteristics, The effect of improving the anti-interference ability

Active Publication Date: 2022-04-08
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the pulse pressure judgment threshold needs to be calculated after pulse compression. On the one hand, it increases the computational complexity; on the other hand, if the threshold calculation is inaccurate, it will affect the target detection result.
The disadvantage of this method is that in the process of looking up the table, it is necessary to make a difference between the input target velocity channel signal and the target velocity in the two-dimensional velocity defuzzification table row by column, which results in a large amount of calculation, slow table lookup speed and low efficiency.
[0005] It can be seen from the prior art that the current methods to solve the radar range-velocity ambiguity problem have problems such as large amount of calculation and inaccurate target detection results, which will affect the calculation efficiency of radar signal processing and target detection results.

Method used

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  • Velocity Defuzzification Method Based on Coherent Frequency Agile Radar
  • Velocity Defuzzification Method Based on Coherent Frequency Agile Radar
  • Velocity Defuzzification Method Based on Coherent Frequency Agile Radar

Examples

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Embodiment 1

[0033] The pulsed radar system is widely used due to the effective avoidance of the transmitter interference receiver problem, but the distance-speed fuzzy problem is often difficult to avoid in the pulsed radar system. There is a problem in solving a large amount of calculation, the target detection result is inaccurate, and these issues will affect computational efficiency and target test results. See image 3 .

[0034] The present invention conducts research and innovation, and proposes a speed solution method based on phase reference frequency, a speed determination radar, see figure 1 The present invention performs speed demolation of the radar pulse echo signal by velocity phase compensation, and the radar pulse echo signal after speed phase compensation is subject to the target detection, and the present invention includes the following steps:

[0035] (1) Receive radar pulse echo signal: The linear frequency modulated radar transmitter continuously transmits N type pulse f...

Embodiment 2

[0053] The radar Doppler vector group described in the first and step (4) based on the phase-galvanic frequency-based radar, including the following steps, including the following steps:

[0054] (4A) Calculate the maximum Doppler frequency f that the radar can detect dmax , Radar minimum resolve Doppler frequency Δf d :

[0055]

[0056] Among them, f dmax The maximum Doppler frequency that the radar can detect, then [-f dmax , f dmax ] Indicating the Doppler frequency range, Δf that the radar can detect. d Indicates that the radar minimum can be distingurated Doppler frequency, f min Indicates the minimum value of the carrier frequency in the transmit pulse signal, and B represents the transmit pulse signal bandwidth, T r Radar transmit pulse signal repetition period, B f Indicates the frequency of the radar transmitter frequency.

[0057] (4b) The Doppler frequency range that can be detected by the radar can obtain average division, resulting in a set of Doppler frequency seq...

Embodiment 3

[0063] The maximum correlation method described in Examples 1-2, step (5a) based on phase reference frequency, speed-threatening radar, as described in Examples 1-2, step (5a) figure 2 The specific steps are:

[0064] (5A1) Build a Dictionary matrix D:

[0065]

[0066] Where D represents the dictionary matrix constructed according to the pulse echo signal, E represents an index operation of the natural constant is the bottom of the bottom, and J represents the arithmetic square root of -1, π represents the circumference rate, f 1 , f 2 , ..., f N A different carrier frequency in the transmit pulse signal is respectively, n represents the number of transmitted pulse signals. The dictionary matrix constructed of the present invention is constructed according to the pulse echo signal, and the built-in dictionary matrix can be changed according to the change in pulse echo signal carrier frequency, the use is flexible, and the application is convenient, and the calculation efficienc...

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Abstract

The invention discloses a velocity defuzzification method based on a coherent frequency agile radar, which solves the problem of inaccurate target detection caused by distance-velocity ambiguity in pulse radar system signal processing. The implementation method is to receive the radar pulse echo signal; obtain the sampling matrix of the baseband pulse echo signal; pulse compression; construct the radar Doppler vector group; determine the Doppler shift frequency and calculate the speed of the moving target; Velocity Deblurring; Object Detection with Sparse Restoration. The invention calculates the accurate moving target velocity through the Doppler vector group, performs velocity phase compensation on the radar pulse echo signal to realize velocity defuzzification, and detects the target through sparse restoration. The invention has low interception, anti-interference, can accurately calculate the speed of moving targets, has low complexity and can solve the problem of distance-velocity ambiguity in pulse radar system signal processing. The invention is applied to the field of radar target detection.

Description

Technical field [0001] The present invention relates to the field of radar signal processing, and the distance-velocity blurring problem in the pulsed radar system is related to the speed solution method based on phase-galvous frequency-based radar, which can be applied to the target. Background technique [0002] Since the traditional LFM radar and stepping frequency radar carrier frequency change is linear, the phase change law of radar echo phase change caused by the transducer changes is linear, so the distance and speed are coupled to each other. , There is a distance - speed fuzzy problem, see image 3 It greatly reduces the detection ability of the target. Therefore, solving the distance - speed fuzzy problem of pulse radar systems to improve the target's detection ability is an important development direction in radar signal processing. [0003] Xi'an Space Radio Technology Research Institute of Patent Document in its application "A variable-speed fuzzy method based on cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S7/36
CPCG01S7/415G01S7/36
Inventor 全英汇董淑仙陈侠达李亚超邢孟道高霞张瑞林露吴彬彬余兆明赵佳琪赵金珊姚洪斌
Owner XIDIAN UNIV