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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
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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

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  • 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

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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...

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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...

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Application Information

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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
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