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A Multiphase Orthogonal Code Generation Method Based on Improved Immune Genetic Algorithm

An immune genetic algorithm and polyphase orthogonal code technology, applied in the field of polyphase orthogonal sequence generation, can solve problems such as prone to premature, stay in local optimal solution, slow convergence speed, etc., to solve the problem of easy premature maturity and convergence speed Slow, performance-optimized effect

Active Publication Date: 2017-04-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main solution of the present invention is: in view of the existing methods for generating polyphase orthogonal codes, the convergence speed is too slow, and the optimization process tends to be precocious and stay in the local optimal solution, etc., and proposes an improved A Method for Generating Orthogonal Polyphase Code Sequences by Immune Genetic Algorithm

Method used

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  • A Multiphase Orthogonal Code Generation Method Based on Improved Immune Genetic Algorithm
  • A Multiphase Orthogonal Code Generation Method Based on Improved Immune Genetic Algorithm
  • A Multiphase Orthogonal Code Generation Method Based on Improved Immune Genetic Algorithm

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Embodiment Construction

[0051] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] The example used in this introduction is to use the method of the present invention to generate an orthogonal sequence with 4 sequences, 40 code lengths and 4 optional phases. The flow chart of its implementation is as follows figure 1 shown.

[0053] Model an orthogonal polyphase codeset:

[0054] Assuming that the orthogonal polyphase code set has L sequences, each with N sub-pulses, then the signal set can be expressed as:

[0055]

[0056] If the number of phases available in polyphase encoding is M, then the phase of the sub-pulse can only be selected from the following phase sets:

[0057]

[0058] For a polyphase code set S whose code length is N and the number of signals is L, it can be represented by an L×N phase matrix:

[0059]

[0060] The matrix in the formula is the optimized object, which contains all the in...

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Abstract

The invention discloses a polyphase orthogonal code generation method based on an improved immune genetic algorithm, belongs to the field of radar emission waveform generation, and relates to a polyphase orthogonal sequence generation method based on an improved immune genetic algorithm. First, model the orthogonal polyphase code set; establish the initial population; calculate the adaptive weighting coefficient; perform genetic algorithm selection, crossover, and mutation operations; calculate the individual information entropy H and its similarity A; update the population; remember Unit updates. This method introduces the memory function of the immune algorithm, and adopts a subsequent selection method for the impact of the increase in the number of sequences on the performance of polyphase orthogonal code sets, so that the algorithm has good convergence and the diversity of the population is maintained. And get better performance than previous algorithms.

Description

technical field [0001] The invention belongs to the field of radar emission waveform generation, and relates to a multiphase orthogonal sequence generation method based on an improved immune genetic algorithm. Background technique [0002] Orthogonal sequences are widely used in various fields of radar and communication. Multiple-input multiple-output (MIMO) radar, as a new system, has been widely concerned by researchers because of its superior performance since it was proposed. Among them, phased array radar and synthetic aperture radar are special cases of MIMO radar. In MIMO radar, in order to avoid mutual interference between communication signal channels, the signals at the transmitting end of MIMO radar are usually required to be orthogonal to each other, so the quality of the transmitting waveform has a great influence on the detection performance of the entire radar. So the optimization of transmitting waveform is also an important research direction of MIMO radar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06N3/12
Inventor 周云于雪莲崔明雷邹林钱璐蒋易松
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA