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Broadband nonlinear frequency modulation signal time difference/scale difference estimation method based on Fourier-Mellin transform

A non-linear frequency modulation and Fourier transform technology, applied in the field of signal processing, to achieve the effect of low computational complexity

Pending Publication Date: 2021-10-19
NAVAL AVIATION UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a method for estimating time difference / scale difference of broadband nonlinear FM signal based on Fourier Merlin transform, so as to solve the problem of time difference / scale difference estimation in dual-star passive positioning system

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  • Broadband nonlinear frequency modulation signal time difference/scale difference estimation method based on Fourier-Mellin transform
  • Broadband nonlinear frequency modulation signal time difference/scale difference estimation method based on Fourier-Mellin transform
  • Broadband nonlinear frequency modulation signal time difference/scale difference estimation method based on Fourier-Mellin transform

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Embodiment Construction

[0082] The present invention will be described in detail below in conjunction with the accompanying drawings. attached figure 1 It is a flowchart of method steps of the present invention. Concrete steps of the present invention are as follows:

[0083] Step (1) calculate two-way signal Fourier transform, take envelope and obtain two-way signal frequency spectrum;

[0084] Step (2) Calculate the scale cross-correlation function of the second channel signal spectrum and the first channel signal spectrum, and peak search estimates the scale difference;

[0085] Step (3) time scale the first signal according to the estimated scale difference;

[0086] Step (4) Calculate the time-domain cross-correlation function between the second signal and the first signal after the time scale, and perform a peak search to estimate the time difference.

[0087] Assuming that the traditional method WBCAF scale factor values ​​are 10, 100, 1000 respectively, appended figure 2 This is the varia...

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Abstract

The invention belongs to the field of signal processing, and provides a broadband nonlinear frequency modulation signal time difference / scale difference estimation method based on Fourier-Mellin transform for solving the time difference / scale difference estimation problem in a double-satellite passive positioning system. The core idea is to perform cascade estimation on time difference / scale difference by using Fourier transform time translation invariance and Mellin transform scale invariance. A result shows that compared with a traditional time difference / scale difference estimation method based on a broadband cross-ambiguity function, the method provided by the invention is lower in calculation complexity; and compared with a time difference / scale difference estimation method based on fractional Fourier transform, the method provided by the invention can be applied to linear frequency modulation (LFM),Quadratic Frequency Modulation (QFM), exponential frequency modulation (EFM), hyperbolic frequency modulation (HFM) and Gaussian noise pulse signals.

Description

technical field [0001] The invention belongs to the field of signal processing and is suitable for solving the problem of time difference / scale difference estimation in a dual-star passive positioning system. Background technique [0002] Electronic warfare is an important part of information warfare, and precise positioning of targets is an important content of electronic warfare. Target positioning systems can usually be divided into active positioning systems and passive positioning systems. A typical active positioning system is radar. Since it needs to radiate electromagnetic signals to obtain target echoes, it is easy to be detected by the enemy on the battlefield and suffer from anti-radiation weapons. hit. In comparison, the passive positioning system itself does not radiate electromagnetic signals and has good concealment. The typical system is dual-star passive positioning. Under broadband conditions, the dual-satellite passive positioning system estimates the ti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/06
CPCG01S5/06
Inventor 于洪波张亮张翔宇王国宏孙殿星杨林
Owner NAVAL AVIATION UNIV
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