Orthonormal discrete frequency coding design method possessing relative low self correlation performance

An autocorrelation, discrete frequency technology, applied in the field of radar communication, which can solve problems such as limiting the application of MIMO radar systems

Inactive Publication Date: 2008-08-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, O-DFCW has a high autocorrelation peak, which limits its application in MIMO radar systems (see literature: Comments on DiscreteFrequency-coding Waveform Design for Netted Radar Systems, Bo Liu; Zishu He; IEEE Signal Processing Letters, to appear , "Comment on the DFCW Design of a Networked Radar System")

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  • Orthonormal discrete frequency coding design method possessing relative low self correlation performance
  • Orthonormal discrete frequency coding design method possessing relative low self correlation performance
  • Orthonormal discrete frequency coding design method possessing relative low self correlation performance

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Embodiment Construction

[0102] Based on the detailed technical solution of the present invention, we can design DFCW_LFM orthogonal discrete frequency coded signals of any number and any code length. We designed DFCW_LFM with lengths of 32 and 64 to compare with DFCW_FF to illustrate the performance of the proposed method. Figures 7-9 illustrate the specific simulation conditions.

[0103] Design of orthogonal DFCW_LFM waveform set with 3 waveforms and 32 subcodes:

[0104] According to the relationship given in Figure 4, when the code length is 32, the parameters Δf, B and T are set, and when the relationship B / Δf=24 is satisfied, the ASP can be reduced; at the same time, the elimination of the grating lobe of the DFCW_LFM signal can also be reduced . Then optimize the orthogonality (cross-correlation) of the signal, and encode it through the flow chart shown in Figure 6. The basic parameters of the iterative process are set as follows: there are 100 individuals in the population; the probabilities...

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Abstract

The present invention belongs to the field of radar communication technique, especially relates to method for design MIMO radar orthogonal discrete frequency code. The present invention employs linearity frequency modulation disperse frequency code (DFCW_LFM) and location relation of grating lobe and zero point of autocorrelation function of DFCW_LFM (shown in formula A) to determine relation of parameter N of DFCW_LFM signal with lower autocorrelation function and B/delta f to fall ASP. After gaining lower ASP, produce randomly K group original frequency code serial with lower autocorrelation, namely original group S0, and searching by improved genetic algorithm (MGA) provided by present invention, and the optimizing orthogonal discrete DFCW_LFM code which has lower autocorrelation and mutual-correlation compared to present DFCW_FF code. The orthogonal discrete DFCW_LFM code of present invention makes the MIMO radar has better detecting capability.

Description

technical field [0001] The invention belongs to the technical field of radar communication, and particularly relates to a design method for orthogonal discrete frequency coding of MIMO radar. Background technique [0002] There are many problems in the application of traditional phased array radar, such as easy to be intercepted when detecting weak targets, strong clutter signal leads to excessive dynamic range, good moving target display (MTI) and moving target detection (MTD) performance requirements The frequency stability of the system, phase noise and system spurs all put forward high requirements. [0003] MIMO radar technology can solve the above problems well. At the transmitting end, each array element (or sub-array) transmits mutually orthogonal signal waveforms in all directions. The orthogonal waveforms cannot be superimposed coherently in space, thus forming a wide transmit beam. It enhances the anti-interception ability of the signal. The echo signal is the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S7/36G01S13/02
Inventor 刘波何子述成芳李军李会勇严济鸿
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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