Detection and parameter estimation method for linear frequency modulation signals

A linear frequency modulation signal and parameter estimation technology, applied in the fields of sonar, communication and radar, can solve the problem of parameter estimation accuracy limitation, and achieve the effect of reducing time delay and improving signal estimation accuracy.

Inactive Publication Date: 2013-03-27
ELECTRONICS ENG COLLEGE PLA
View PDF0 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is that the traditional DFRFT algorithm needs to collect all the input data before performing DFRFT calculation, and there is a certain processing delay, which often cannot meet the requirements in the field of high-speed signal processing; at the same time, the parameter effect caused by the discretization of DFRFT parameters makes Parameter estimation accuracy is limited

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Detection and parameter estimation method for linear frequency modulation signals
  • Detection and parameter estimation method for linear frequency modulation signals
  • Detection and parameter estimation method for linear frequency modulation signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] A detection and parameter estimation method of a chirp signal, the method comprises the steps in the following order: Step 1, dimensionally normalizing the received signal; Step 2, performing discrete fractional order on the dimensionally normalized signal Fourier transform self-adaptive calculation; step 3, extracting parameters on the basis of interpolation operation, and obtaining the center frequency of the chirp signal and the modulation frequency. Such as figure 1 shown.

[0012] The following combination figure 1 The present invention is further described.

[0013] 1. Dimensional normalization of the received signal

[0014] The expression of chirp signal disturbed by additive white Gaussian noise is written as:

[0015] x(t)=a 0 exp[jπ(2f 0 t+μ 0 t 2 )]+n(t) (1)

[0016] where a 0 , f 0 and μ 0 are unknown parameters, representing the amplitude, center frequency and modulation frequency of the chirp signal respectively, and n(t) is additive white Gau...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a detection and parameter estimation method for linear frequency modulation signals. The method comprises the following steps: (1) carrying dimension normalization for signals received; (2) carrying out discrete fractional Fourier transform self-adaptive calculation for signals after dimension normalization; and (3) extracting parameters based on interpolative calculation to obtain a central frequency calculation frequency of the linear frequency modulation signals. According to the invention, when the signals are received, the DFRET of the model is calculated by using an adaptive algorithm, so that the time delay generated by the calculation of DFRET after completely collecting data. In addition, the signal estimation precision is improved by difference processing in a parameter searching stage in a two-dimensional plane of the DFRFT.

Description

technical field [0001] The invention relates to the fields of radar, sonar and communication, in particular to a detection and parameter estimation method of a linear frequency modulation signal. Background technique [0002] As a typical non-stationary signal, LFM (Linear Frequency Modulation) signal is widely used in the fields of radar, communication and sonar. The LFM signal appears as a straight line in the time-frequency plane, and any signal with complex frequency changes can be used by multiple Superposition of LFM signals to approximate. If a time-frequency distribution cannot provide good time-frequency aggregation characteristics for LFM signals, it will not be suitable for processing and analyzing non-stationary signals. Therefore, it is often used as a basis for judging whether a time-frequency analysis method is effective. It can be seen that the research on linear frequency modulation signals has extensive and profound significance. [0003] For chirp signal...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/14
Inventor 胡以华郝士琦冷蛟锋焦均均赵楠翔骆盛周建国
Owner ELECTRONICS ENG COLLEGE PLA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap