Multi-phase orthogonal code generating method based on improved immune genetic algorithm

An immune genetic algorithm and multi-phase orthogonal code technology, applied in the field of multi-phase orthogonal sequence generation, can solve problems such as slow convergence speed, prone to premature, and staying in local optimal solutions.

Active Publication Date: 2015-02-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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

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  • Multi-phase orthogonal code generating method based on improved immune genetic algorithm
  • Multi-phase orthogonal code generating method based on improved immune genetic algorithm
  • Multi-phase orthogonal code generating method based on improved immune genetic algorithm

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] 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.

[0052] Model an orthogonal polyphase codeset:

[0053] Assuming that the orthogonal polyphase code set has L sequences, each with N sub-pulses, then the signal set can be expressed as:

[0054] { S l ( t ) = a ( t ) e jφ l ( n ) , n = 1,2 ...

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Abstract

The invention discloses a multi-phase orthogonal code generating method based on the improved immune genetic algorithm, belongs to the field of radar transmitted waveform generation, and relates to the multi-phase orthogonal code generating method. An orthogonal multi-phase code set is modeled, an initial population is established, a self-adaptation weighting coefficient is calculated, the genetic algorithm selecting, crossing and mutation operation is carried out, the information entropy H and the similarity A of the individual are calculated, group updating is carried out, and a memory unit is updated. The memory function of the immune algorithm is introduced, the subsequent selecting method is adopted for the effect of the increasing of the number of sequences on the multi-phase orthogonal code set performance, the algorithm has good convergence, the diversity of the group is kept, and the performance superior to the performance of original algorithms is obtained.

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...

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Application Information

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Patent Type & Authority Applications(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
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