Sinusoidal frequency-modulated signal parameter estimation method

A technology of sinusoidal frequency modulation and signal parameters, applied in the field of communication, can solve problems such as high computational complexity and reduced estimation performance

A technology of sinusoidal frequency modulation and signal parameters, applied in the field of communication, can solve problems such as high computational complexity and reduced estimation performance

CN110737868AActive Publication Date: 2020-01-31UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Sinusoidal frequency-modulated signal parameter estimation method
  • Sinusoidal frequency-modulated signal parameter estimation method
  • Sinusoidal frequency-modulated signal parameter estimation method

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Embodiment Construction

[0091] The practicability of the present invention will be described below in conjunction with the accompanying drawings and simulation examples.

[0092] Let N=256; The specific steps of the method for estimating the parameters of the sinusoidal FM signal based on JAE-PNR used in this embodiment are:

[0093] S1. Bring r[n] and N=256 into the JAE-based parameter estimation method to obtain the modulation frequency estimation value modulation phase estimate and modulation index estimates

[0094] S2, r[n], N=256, with Into the PNR-based parameter estimation method, update with

[0095] S3. Calculation accuracy evaluation variables

[0096] S4. Calculate intermediate variables and lambda (1) = lambda;

[0097] S5. Bring r[n] and N=256 into an iterative-based parameter estimation method to obtain an estimated modulation frequency value modulation phase estimate and modulation index estimates

[0098] S6, r[n], N=256, with Into the PNR-based parame...

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Abstract

The invention belongs to the technical field of communication, and particularly relates to a sinusoidal frequency-modulated signal parameter estimation method. The sinusoidal frequency-modulated signal parameter estimation method comprises the following steps: firstly, demodulating a received signal according to an initial parameter estimation value; for reducing noise of a frequency-modulated signal, replacing the real part of the demodulated signal with a constant, the constant being the mean value of the real part of the demodulated signal, then obtaining the phase of the received signal bythe initial parameter estimation value and the phase estimation of the new demodulated signal; and finally obtaining the final parameter estimation value according to the estimated phase of the received signal. In the second part, it is considered that the modulation index is larger than pi / 2, and a parameter estimation method based on iteration is provided to obtain an initial parameter estimation value, and then the precision of the initial estimation value is improved through a method based on PNR. In the third part, the accuracy of the parameter estimates from the first part and the second part is compared and a set of parameters with higher accuracy are selected as final parameter estimates.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a parameter estimation method of a sinusoidal frequency modulation signal. Background technique [0002] Sinusoidal Frequency-Modulated (SFM) signal is a general model of micro-Doppler effect. This effect is associated with rotating or vibrating parts of radar targets. Therefore, parameter estimation of SFM signals is widely used in communication, radar, sonar and other fields. The parameters of the SFM signal include modulation frequency, modulation phase and modulation index. Through the Jacobi-Anger expansion, the SFM signal can be decomposed into an infinite number of sinusoidal signals with the modulation frequency as the interval. When the modulation index is less than 2, the SFM can be approximated as a DC signal and a real sinusoidal signal with the modulation frequency as the frequency. [0003] Aiming at the parameter estimation of sinusoidal FM sig...

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Application Information

Patent Timeline
31 Jan 2020
Publication
CN110737868A
IPC
G06F17/14
CPC
G06F17/14
Inventors
柏果; 程郁凡