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Orthogonal waveform optimization design method for LFM-PC composite modulation signal

A technology of LFM-PC and composite modulation, which is applied in the direction of radio wave measurement systems and instruments, can solve problems that do not involve discrete phase modulation methods, and achieve the effect of low self-ambiguity function sidelobe and mutual ambiguity function, and fast process

Pending Publication Date: 2021-06-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] However, the traditional LFM-PC signal mostly adopts the form of inter-pulse phase code modulation and intra-pulse linear frequency modulation. There is a lack of research on other modulation forms, and the only few studies basically do not involve discrete phase modulation methods.

Method used

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  • Orthogonal waveform optimization design method for LFM-PC composite modulation signal
  • Orthogonal waveform optimization design method for LFM-PC composite modulation signal
  • Orthogonal waveform optimization design method for LFM-PC composite modulation signal

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Embodiment Construction

[0074] The present invention is described in detail below in conjunction with embodiment and accompanying drawing, but it should be understood that described embodiment and accompanying drawing are only used for exemplary description of the present invention, and can not constitute any limitation to protection scope of the present invention. All reasonable transformations and combinations included in the spirit of the invention fall within the scope of protection of the present invention.

[0075] The optimal design of the orthogonal waveform of the LFM-PC composite modulation signal is carried out through the following process:

[0076] S1 builds the LFM-PC composite modulation signal model.

[0077] In specific implementation, the signal model can be further set as follows:

[0078]

[0079] Among them, u(t) represents the signal envelope of a group of M pulse signals transmitted by a radar in a CPI; T R Indicates the pulse repetition period, its value is much greater t...

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Abstract

The invention discloses an orthogonal waveform optimization design method for an LFM-PC composite modulation signal. The method comprises the following steps: constructing an inter-pulse signal self-ambiguity function model and an inter-pulse signal cross-ambiguity function model in a discrete form; constructing an optimization model based on the two fuzzy function models; and solving the optimization model through an ADMM algorithm, wherein the composite modulation signal is obtained through intra-pulse linear frequency modulation and intra-pulse phase coding composite modulation. The optimized LFM-PC signal obtained by the optimization design method provided by the invention is an orthogonal waveform with wide Doppler tolerance.

Description

technical field [0001] The invention relates to the technical field of LFM-PC composite modulation signal. Background technique [0002] Orthogonal waveforms are widely used in multiple input multiple output (MIMO) radar systems and anti-spoofing jamming technology, but PC signals, which have been widely studied due to their high resolution and measurement accuracy, are used in high-speed motion platforms and There are Doppler sensitivity problems in high-speed target detection, and the signal form is simple and the anti-interference ability is poor. Even though a variety of optimization algorithms are proposed in the prior art to optimize the orthogonal waveform design of the PC signal to obtain better waveform diversity Gain and waveform isolation, but none of them take into account the situation that the main-side lobe ratio of the signal will deteriorate sharply when the platform or target moves quickly, and the problem of too narrow Doppler tolerance of the PC signal is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 邱旦峰赵家琛胡婉婉王玉莹王娜张劲东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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