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Self-adaptive anti-interference method for frequency-agility radar

A frequency agile and adaptive technology, applied in radio wave measurement systems, instruments, etc., can solve the problem of optimal signal-to-interference ratio of radar echo signals that cannot be frequency agile, not an anti-jamming strategy, low interception and anti-jamming performance, etc. problems, to achieve the effect of improving adaptive anti-jamming capability, long detection distance, and high signal-to-interference ratio

Pending Publication Date: 2022-01-04
XIDIAN UNIV
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Problems solved by technology

However, the battlefield environment where the frequency agility radar is located is changing rapidly. Although the online random call of the offline optimized frequency hopping sequence can improve the low interception and anti-jamming performance to a certain extent, it lacks targeted waveform transmission for interference scenarios, so the random transmission of the optimized waveform sequence It is not the optimal anti-jamming strategy, nor can it make the signal-to-interference ratio of the frequency agile radar echo signal optimal

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[0020] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0021] refer to figure 1 , the adaptive anti-jamming method of frequency agility radar of the present invention, comprises the following steps:

[0022] Step S1, based on the principle of orthogonality of adjacent pulses, optimize the frequency hopping sequence of the frequency agile radar, and generate an offline optimized frequency hopping sequence library.

[0023] Specifically, define the instantaneous bandwidth of the radar waveform as B; define the narrow-band aiming bandwidth of the jammer as B j ; Define the number of sequences in the offline optimized frequency hopping sequence library as N; define ρ i For offline optimization of the i-th optimized frequency ho...

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Abstract

The invention relates to the field of radar signal processing, in particular to a self-adaptive anti-interference method for a frequency-agility radar. The method comprises the following steps of: S1, optimizing a frequency hopping sequence of a frequency-agility radar based on an adjacent pulse orthogonality principle, and generating an offline optimized frequency hopping sequence library; S2, selecting an online frequency hopping optimal sequence based on the detection information of an electromagnetic environment; S3, enabling the frequency-agility radar to transmit a waveform according to the online frequency hopping optimal sequence, obtaining the echo matrix of the frequency-agility radar, and performing pulse compression processing to obtain a pulse compression matrix; and S4, generating a dictionary matrix matched with target speed-distance information based on the online frequency hopping optimal sequence, and performing coherent processing of the frequency-agility radar on a slow time domain pulse pressure signal. According to the invention, the self-adaptive anti-interference capability of the frequency-agility radar in a complex and changeable environment is improved, so that the frequency-agility radar realizes more targeted interference frequency band avoidance, and has a higher signal to interference ratio and a farther detection distance.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to an adaptive anti-jamming method for frequency agility radar. Background technique [0002] Frequency agility radar, also known as frequency agility radar, frequency agility radar between pulses, frequency agility radar adopts the radar system of random jumping of carrier frequency between pulses, so it has excellent anti-detection and anti-jamming performance, in recent years , with the maturity of coherent processing technology of frequency agile radar, frequency agile radar has been widely used on different radar platforms. [0003] In order to improve the target detection performance of frequency-agile radar, the frequency-hopping sequence should be optimized for frequency-agile radar. Optimize the waveform of the frequency hopping sequence library to achieve a certain degree of autonomous anti-jamming, and make the frequency agility radar have anti-sorting ability and ...

Claims

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 吴耀君全英汇刘智星方文杜思予邢孟道
Owner XIDIAN UNIV
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