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Radar ambiguity and shielding solving method based on orthogonal two-phase coded signals

A two-phase encoding and defuzzification technology, which is applied in the field of radar deambiguation and occlusion based on orthogonal two-phase encoding signals, can solve the problems of speed ambiguity, distance ambiguity, distance occlusion, etc., and solve the problems of distance ambiguity and speed ambiguity Effect

Pending Publication Date: 2021-12-14
YANGTZE DELTA REGION INST (QUZHOU) UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of speed ambiguity, high pulse repetition frequency (HPRF) can be used, but it also brings problems of distance ambiguity and distance occlusion

Method used

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  • Radar ambiguity and shielding solving method based on orthogonal two-phase coded signals
  • Radar ambiguity and shielding solving method based on orthogonal two-phase coded signals
  • Radar ambiguity and shielding solving method based on orthogonal two-phase coded signals

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Embodiment 1

[0099] The effective feasibility of the present invention is verified in the foregoing method.

[0100] The PD radar sample rate is 100MHz, the pulse width τ is 0.64μs, pulse repetition period (PRI) is 64μs, a radar cycle T max Contains four PRIs, including 16 T max The radio frequency f is 3 GHz and C is radius. Then the distance is the blind spot at this time.

[0101]

[0102] The maximum non-fuzzy distance is

[0103]

[0104] Maximum unambiguous speed

[0105]

[0106] Set the distance of 10km, the target is 240m / s, and the signal to noise ratio is -10 dB. If the transmitted signal uses the same signal, its MTD results are image 3 As shown, the echo of which transmit pulse signal cannot be distinguished from the echo, which is blurred.

[0107] The method of the present invention is employed, and the two-phase encoded pulse signal is transmitted to each other, and the MTD result is as Figure 4 As shown, the distance and speed of the target can be accurately measured. ...

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Abstract

The invention discloses a radar ambiguity and shielding solving method based on orthogonal two-phase coded signals, relates to the field of radars, and solves the problems of range ambiguity and shielding. The method comprises the steps that a walsh matrix is selected according to the code length, and an orthogonal two-phase coded signal set is generated and optimized through a genetic algorithm or obtained through an exhaustion method; a radar period and a pulse repetition time interval PRI are determined according to the farthest detection distance of the radar, the number m of transmitted pulses in the time corresponding to the maximum detection distance is determined, and m signals are selected from the orthogonal two-phase code signal set to form a group of orthogonal two-phase code pulse signals; and echo accumulation is carried out on the transmitted pulse signals, an echo matrix is generated, frequency domain pulse compression processing is carried out on the echo matrix in cooperation with the orthogonal two-phase coding pulse signals, a processed new echo matrix is obtained, and MTD processing is carried out on the echo matrix. According to the method, the problem of velocity ambiguity is well solved while the problems of distance ambiguity and shielding are solved.

Description

technical field [0001] The invention relates to the field of radar, in particular to a radar deambiguation and shielding method based on an orthogonal biphase coded signal. Background technique [0002] In the search phase of the digital array radar, the target distance, speed, angle and other information are unknown. In order to detect the target at a long distance, the pulse Doppler (PD) radar system is often used, and the transmitting and receiving antennas are shared (or the transmitting and receiving are not shared). Antenna, this patent is aimed at the scene where the transmitting and receiving antennas are shared). [0003] For radars with a pulse-transmitting switching system, when the delay time of the target is greater than the repetition period of the transmitted pulse, range ambiguity will occur. Velocity ambiguity occurs when the Doppler frequency induced by target motion is greater than half the transmit pulse repetition frequency. [0004] In order to solve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/32G01S13/58G01S7/28
CPCG01S13/325G01S13/582G01S7/28G06N3/126G01S13/288G01S13/12G01S7/2923
Inventor 严济鸿李聪张欢董海洋翟鉴枢杨礼倪伟涵王顺祥
Owner YANGTZE DELTA REGION INST (QUZHOU) UNIV OF ELECTRONIC SCI & TECH OF CHINA
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