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A radar anti-jamming method

A radar, pseudo-random number technology, applied in the field of radar, can solve the problems of co-frequency interference, speed blur, distance blur, etc., to achieve the effect of filtering co-frequency interference

Active Publication Date: 2018-06-29
SHENZHEN CHENG TECH CO LTD
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AI Technical Summary

Problems solved by technology

Ranging and speed measurement are the most basic functions of radar. Among them, FMCW (frequency modulated wave) is widely used because of its low radiation power, high measurement accuracy and relatively simple equipment. However, the traditional radar detection technology using a single waveform FMCW is vulnerable to the same frequency Interference, causing problems with distance ambiguity and speed ambiguity

Method used

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Embodiment 1

[0027] The transmitting wave used in the present invention is FMCW (Frequency Modulated Continuous Wave), that is, frequency modulated wave. The basic principle of FMCW technology is that the transmitted wave is a high-frequency wave, and its frequency changes with time according to the law of triangular waves. The frequency of the echo received by the radar is the same as that of the transmitted frequency, both of which are triangle waves, but there is a time difference, and the target distance can be calculated by using this small time difference.

[0028] see figure 1 , a radar anti-jamming method, comprising the following steps:

[0029] S10. Generate a pseudo-random array, and the control unit generates a pseudo-random array. A group of pseudo-random arrays is generated by the radar controller. The pseudo-random array is within a complete FMCW frequency time limit. The radar controller generates an array composed of finite numbers, and different arrays can be selected a...

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Abstract

The invention relates to a radar anti-interference method which comprises the following steps of generating a pseudo random number set, namely generating the pseudo random number set according to a certain rule; setting modulation time, and setting modulation reference time T; weighting the reference time T by the pseudo random number set, thereby generating pseudo random time, wherein the pseudo random time through weighting is k1T, k2T, k3T,..., knT; performing signal modulation, and realizing body change of a transmitting signal at the time of k1T, k2T, k3T,..., knT; selecting the pseudo random time through weighting of the pseudo random number set as the phase shifting time of a transmitting system and a receiving system on the current interference condition, and after phase shifting of the transmitting signal, performing frequency mixing on the transmitting signal and an echo signal, and inhibiting non-synchronous interference signals.

Description

technical field [0001] The invention relates to radar, in particular to a radar anti-jamming method. Background technique [0002] At present, the radar system obtains the distance information of the target by measuring the echo delay time of the transmitted signal, and obtains the radial velocity of the target relative to the radar by measuring the Doppler frequency of the echo. Ranging and speed measurement are the most basic functions of radar. Among them, FMCW (frequency modulated wave) is widely used because of its low radiation power, high measurement accuracy and relatively simple equipment. However, the traditional radar detection technology using a single waveform FMCW is vulnerable to the same frequency Interference, causing the problem of distance ambiguity and velocity ambiguity. Contents of the invention [0003] The technical problem mainly solved by the present invention is to provide a radar anti-jamming method, which can obtain the same target detection e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36G01S7/02G01S13/34
CPCG01S7/023G01S7/36G01S13/345
Inventor 陈承文刘龙龙安清儒谭树杰
Owner SHENZHEN CHENG TECH CO LTD
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