MIMO quadrature phase coding waveform generation method based on SQP-GA

Abstract

The invention discloses an MIMO (Multiple Input Multiple Output) orthogonal phase coding waveform generation method based on SQP-GA (Structured Quadrature Pattern-Genetic Algorithm), which comprises the following steps of: optimizing a phase coding matrix by adopting an improved SQP-GA algorithm to obtain an optimized phase coding matrix, and designing an orthogonal transmission waveform by adopting the optimized phase coding matrix to obtain an orthogonal waveform of an MIMO radar. The method for optimizing the phase coding matrix by adopting an improved SQP-GA algorithm specifically comprises the following steps: setting parameters and initializing a population; performing fragment crossover operation between individuals; performing chromosome mutation operation; performing crossover operation between chromosomes; carrying out SQP iterative optimization operation; calculating individual fitness and a filial generation screening strategy; and stopping condition judgment. According to the method, the problem that the efficiency is low due to the fact that the randomness is too high during solving of the genetic algorithm can be solved, the problem that selection of the initial point is too sensitive in the SQP algorithm can also be solved, and therefore a better waveform result is obtained.

Description

Technical field [0001] The present invention belongs to the field of signal processing, and more particularly to a method of generating a MIMO orthogonal phase encoding waveform based on SQP-GA. Background technique [0002] MIMO (MULTIPLE-IN MULTIPLE-OUT, multi-input multi-output) radar as a new system under radar launch signal mode, has received more and more attention in recent years. Through the design of the MIMO radar transmitted signal, the orthogonality of the emission waveform can match the radar echo signal, improve the detection and tracking ability of the radar on the target. Ideally, the autocorrelation function of the orthogonal waveform should be an impulse function, while the mutual relationship between the waveform should be 0. However, in the actual situation, the waveform of the autocorrelation and cross-correlation is not exist, so the orthogonal waveforms in strict sense are not existent. [0003] Common MIMO orthogonal waveform design methods include SA (Sim...

AI Technical Summary

Problems solved by technology

The SQP algorithm has better performance in local search optimization, but it is too sensitive to the initial value selection

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