A Two-phase Modulation Method and Device for Improving the Detection Performance of Pulse Doppler Radar

A technology of pulse Doppler and two-phase modulation, applied in the field of radar, which can solve the problems of high computational complexity, poor performance, and poor output signal-to-interference-to-noise ratio

Active Publication Date: 2021-01-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0017] In order to solve the above technical problems, the present invention proposes a two-phase modulation method and device for improving the detection performance of pulse Doppler radar. The method and device are used to solve the problem of high computational complexity, poor performance, and output The signal-to-interference-noise ratio effect is poor, which is not conducive to the implementation on the embedded platform. The performance of the bi-phase modulation code optimized by this method is not high.

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  • A Two-phase Modulation Method and Device for Improving the Detection Performance of Pulse Doppler Radar

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[0144] definition:

[0145] CPI: coherent processing interval, coherent processing interval, refers to the length of time that the radar system performs coherent processing.

[0146] SDR: Semidefinite Relaxation, semi-positive definite relaxation, refers to a class of optimization methods in the field of numerical optimization.

[0147] MM: Minorization-maximization refers to a class of optimization methods in the field of exponential value optimization, and is a generalization of the Expectation Maximization (EM) algorithm.

[0148] FISTA: fast iterative shrinkage-thresholding algorithm, fast iterative shrinkage threshold algorithm, is a type of method used to improve the convergence rate of the algorithm.

[0149] combine first figure 2 To illustrate the pulse Doppler radar slow time modulation method of the present invention, the pulse Doppler radar generally transmits several signal pulses at a fixed pulse repetition interval within a coherent processing interval (CPI)....

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Abstract

The present invention provides a two-phase modulation method and device for improving the detection performance of pulse Doppler radar. The method includes: constructing a matrix based on historical data obtained by pulse Doppler radar; solving an optimization problem based on MM and FISTA iteratively to obtain an optimized The solution of the problem; the solution of the optimization problem is randomized to obtain several groups of candidate two-phase modulation codes; the signal-to-interference-noise ratio in the candidate modulation codes is calculated, and the one with the largest signal-to-interference-to-noise ratio is selected as the pulse Doppler radar The two-phase modulation code; based on the two-phase modulation code of the pulse Doppler radar, the transmitted signal pulse of the pulse Doppler radar system is in-phase or anti-phase modulated. According to the scheme of the present invention, the output signal-to-interference-noise ratio of the pulse Doppler radar is improved, the target detection performance of the pulse Doppler radar in interference is improved, and the complexity of the computer is reduced; it is beneficial to realize on an embedded platform; Some pulse Doppler radar systems are compatible, and the cost of upgrading is low.

Description

technical field [0001] The invention relates to the field of radar, in particular to a two-phase modulation method and device for improving the detection performance of pulse Doppler radar. Background technique [0002] Pulse Doppler radar is a radar system developed on the basis of moving target display radar. Pulse Doppler radar adopts coherent transmission and coherent reception, and has the ranging capability of conventional pulse radar and the speed measurement capability of continuous wave radar. Through coherent accumulation and frequency domain filtering of target echoes, pulse Doppler radar has a strong ability to suppress clutter and interference. At present, pulse Doppler radar has been widely used in platforms such as airborne early warning aircraft and airborne fighter jets, and has significant military benefits. [0003] In the actual working environment, it is inevitable to mix various intentional or unintentional interference signals in the radar echo. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/58G01S7/292G01S7/41
CPCG01S7/292G01S7/418G01S13/581G01S13/582
Inventor 唐波史英春张硕王贵生樊甫华黄中瑞
Owner NAT UNIV OF DEFENSE TECH
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