Design method for zero correlation zone like quadrature phase coding signals

Abstract

The invention discloses a design method for zero correlation zone like quadrature phase coding signals, belonging to the technical field of radars. The method can improve the design efficiency and performance of the zero correlation zone like quadrature phase coding signals. The method comprises the following steps that (1) L initial phase coding signals S<N0> of the length of N0 are generated, and the length of a target phase coding signal in the zero correlation zone is determined; (2) it is supposed that n=N0 and Sn=S<N0>; (3) it is supposed that the available phase number of the initial phase coding signals is D, DL L*1-dimensional column vector C<n+1> of the phase coding signals is generated in a traversal manner, it is supposed that S<n+1>=[Sn, C<n+1>], DL phase coding signals S<n+1> of the code length of n+1 are formed, a phase coding signal whose weighted sum of signal correlation energy is minimal is selected from the DL phase coding signals S<n+1> of the code length of n+1, n is added by 1, and the selected phase coding signal of the minimal weighted sum of the signal correlation energy is assigned as Sn; and (4) the step (3) is repeated for N-N0 times, the steps (1) to (4) are repeated from M times, and the phase coding signal of the minimal weighted sum of the signal correlation energy is selected.

Description

technical field [0001] The invention relates to the technical field of radar communication, in particular to a method for designing a quasi-zero-correlation quadrature phase encoding signal. Background technique [0002] In order to ensure that the echo signals of the MIMO radar do not interfere with each other and obtain independent target information from the radar echo signals, the MIMO radar needs to transmit signals of orthogonal waveforms. In practice, ideal quadrature waveform signals do not exist, so signals with both low autocorrelation and low cross-correlation are generally used instead of quadrature waveform signals. [0003] The orthogonal polyphase codes with good autocorrelation and cross-correlation have been designed respectively by using simulated annealing algorithm and genetic algorithm (see literature: DengH. 107. Liu Bo, He Zishu. Design of Orthogonal Polyphase Code Based on Genetic Algorithm [J]. There are large autocorrelation sidelobes and cross-co...

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Problems solved by technology

[0005] In the design of quasi-zero-correlation quadrature multi-phase code signal, literature (LiJian, StoicaP, ZhengX.Signal synthesis and receiver design for MIMOradarimaging[J].IEEETrans.onSignalProcessing, 2008, 56(8): 3959-3968. Sun Ying, He Zishu, Liu Na, etc. .An improved zero-correlation-like quadrature polyphase code design method[J].Radar Science and Technology, 2014, 12(3):273-279.) designed a quasi-zero-correlation quadrature polyphase code with good performance code signal, but it is only applicable to the design of polyphase code signal with continuous phase, not applicable to the situation that the actual radar transmit signal may only have several fixed phases (discrete phase); some literatures use genetic algorithm to design a zero-like code signal with discrete phase Correlated quadrature polyphase code signal (see literature: Jin Ming, Liao Guisheng, Li Jun. Design of quasi-zero correlation quadrature polyphase code based on genetic algorithm [J]. System Engineering and Electronic Technology, 2010, 32(1): 14- 17. Liu Zhiguo, Wang Yali. Local zero-correlation polyphase code design [J]. Radar Science and Technology, 2015, 13(3): 310-313), but the design effect is not ideal, and the efficiency is relatively low

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