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Method and device for estimating multipath time delay of lfm signal

A multi-path delay and signal technology, applied in the field of signal processing, can solve the problems of relying on prior knowledge of noise, high computational complexity, limited impulse noise suppression capability, etc., and achieve the effect of accurate estimation and suppression of impulse noise.

Active Publication Date: 2022-01-11
南京天朗防务科技有限公司
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Problems solved by technology

[0005] In summary, the problems of the existing technology are: high computational complexity, dependence on noise prior knowledge and limited ability to suppress impulse noise

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  • Method and device for estimating multipath time delay of lfm signal
  • Method and device for estimating multipath time delay of lfm signal
  • Method and device for estimating multipath time delay of lfm signal

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Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0044] refer to figure 1 , the present embodiment provides a method for estimating the multipath time delay of an LFM signal, comprising the following steps:

[0045] S10: Receive a multipath LFM signal, and perform P-NAT transformation on the multipath LFM signal;

[0046] Specifically, the time domain expression of the LFM signal is:

[0047] (1)

[0048] In the formula, , k are center frequency and modulation frequency respectively, is the duration...

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Abstract

The present invention discloses a method and device for estimating the multipath time delay of an LFM signal, wherein the estimating method includes: receiving a multipath LFM signal, and performing P-NAT transformation on the multipath LFM signal; ‑NAT-transformed multipath LFM signals are subjected to optimal-order fractional Fourier transform; the peak point in the fractional Fourier transform domain is detected, and the peak position offset and time The relation of delay estimates the multipath time delay of described LFM signal; Estimation method provided by the present invention is by carrying out P-NAT transformation to multipath LFM signal, then carries out the fractional order Fourier transform of optimum order, finally to The multipath time delay of the LFM signal is estimated, and since the P-NAT function can suppress impulse noise, the multipath time delay of the LFM signal can be accurately estimated in an Alpha stable distributed noise environment.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method and device for estimating multipath time delay of an LFM signal under Alpha stable distributed noise. Background technique [0002] The linear frequency modulation (Linear Frequency Modulation, LFM) signal is a non-stationary signal that exists in many fields in nature. Because of its advantages such as low transmission power, long range and anti-Doppler frequency shift, it is widely used in radar and underwater detection. , UWB detection and spread spectrum communication and other fields are widely used. High-precision multipath delay estimation of LFM signals is very important in channel detection and target location. [0003] Matched filtering and deconvolution (deconvolution, DC) algorithms are classic methods for multipath delay estimation, but the resolution of multipath delay in the matched filtering algorithm is greatly affected by the side lobe of the sinc func...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/364
CPCH04B17/364
Inventor 周伟光王梓谦
Owner 南京天朗防务科技有限公司
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