Method for radar waveform designing and optimization

Abstract

The invention discloses a method for radar waveform designing and optimization, wherein the method belongs to the field of radar communication technology. The invention aims to provide the method for waveform designing and optimization, wherein the waveform has characteristics of relatively good thumbtack ambiguity function, low interception probability, relatively high interference resistance, good orthogonality, relatively low peak value power ratio, controllable spectral shape, controllable signal sparsity, controllable signal reconfigurability, etc. According to the method, a related dictionary is optimized according to the requirement for spectrum controllability and low peak mean value power ration in radar waveform design. Furthermore a signal generating system is formed by a signal synthesizing part, an observation matrix part and a sparsity coefficient control part in a closed-loop manner. In signal synthesizing, an output signal is generated according to the dictionary and the sparsity coefficient; a compressed signal is obtained from an output signal through an observation matrix; and the sparsity coefficient required for signal synthesizing at next time is directly obtained from the compression signal through a sparsity coefficient control system. Then in a signal reconstruction system, a reconstructed signal is synthesized from the compressed signal according to the information of the dictionary through the sparisity coefficient control system. The method for radar waveform designing and optimization realizes relatively good application characteristic of the designed radar waveform.

Description

technical field [0001] The invention relates to a radar waveform design and optimization method, which belongs to the technical field of radar communication. Background technique [0002] Waveform design is an important direction in the research field of Radar (Radio Detection and Ranging, Radar). The main signal characteristics concerned by radar waveform design can be summarized as follows: pushpin-type ambiguity function, lower intercept probability, and better anti-jamming performance , good orthogonality, low peak-to-average power ratio, controllable spectrum shape, signal sparsity, and signal reconfigurability, etc. [0003] Generally, chaotic signals have noise-like characteristics. Using chaotic signals directly as radar transmission signals will face the problem of high peak-to-average power ratio (PAPR). Designing various chaotic signals with low PAPR is a common solution. However, the signal generated by chaotic modulation does not necessarily have chaos, and the...

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Problems solved by technology

However, the signal generated by chaotic modulation does not necessarily have chaos, and the loss of chaos will cause the loss of application characteristics such as ambiguity function, orthogonality, low intercept probability and anti-interference of the signal.

The structure of the traditional classical chaotic system does not consider the radar application background, and it is difficult to meet the application requirements of the current radar waveform by using it as the signal source structure, such as low PAPR, controllable spectrum shape, high detection Waveform properties such as probability

[0004] In the patent "A Method for Radar Waveform AM and Phase Modulation Based on Mixed Sequence" (Patent No. CN 105068051 A), Zhou Yun proposed to use a compound sequence formed by mixing tent sequence and logistic sequence at 1:1 for joint AM and phase modulation waveform , thereby reducing the predictable probability of chaotic signals and the probability of radar interception, and improving the anti-jamming performance, but there are disadvantages such as high peak-to-average power ratio (PAPR) and uncontrollable spectral shape of the signal.

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