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Frequency estimation and energy estimation method having feedback function

A technology of frequency estimation and energy estimation, applied in the field of frequency estimation and energy estimation, can solve the problems of complicated adjustment of frequency components, limited maximum refinement multiple of memory space, and large amount of calculation of frequency shift of analysis points, so as to reduce the amount of calculation and improve the Accuracy, the effect of improving calculation speed

Active Publication Date: 2017-03-29
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, this method requires a huge memory space for storing intermediate data, which limits the maximum refinement factor, and the low-pass filter characteristics limit the accuracy and maximum refinement factor. This method requires a large amount of frequency shift calculations for all analysis points and frequency components. Adjustment is more complicated

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  • Frequency estimation and energy estimation method having feedback function
  • Frequency estimation and energy estimation method having feedback function
  • Frequency estimation and energy estimation method having feedback function

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0056] Since the method of the present invention can be applied to beacon detection, the specific implementation process of the method will be described below through an example of the application of the method of the present invention in beacon detection.

[0057] Suppose the expression of the input beacon signal is x(n)=cos(2·pi·f c t), signal intermediate frequency fc=5.7MHz, bandwidth B=200KHz, sampling frequency fs=200K, then the satellite beacon receiving process is as follows:

[0058] 1) Sample x(n) according to the sampling frequency, perform Chirp_z transformation on the sampled signal according to the steps of Chirp_z transformation, and refine the number of points M=126;

[0059] 2) Obtain peak value Ymax=1007.8 according to the transformed result, at the 64th point, obtain new f according to formula (7) be 5.7008MHz;

[0060] 3)...

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Abstract

The invention belongs to the field of frequency estimation and energy estimation and relates to a frequency estimation and energy estimation method having a feedback function. The method is characterized by, in a feedback mode, through first Chirp_z transformation, roughly estimating f0 and obtaining new resolution and bandwidth; carrying out second transformation according to parameters obtained through the first transformation to obtain new f0 and energy; and placing the original f0 by the new f0 obtained each time, such that frequency estimation and energy estimation precision is improved, and f0 can be tracked. The method can realize high-efficiency high-precision frequency estimation and energy estimation.

Description

technical field [0001] The invention belongs to the field of frequency estimation and energy estimation, and relates to a frequency estimation and energy estimation method with feedback function. Background technique [0002] Frequency and energy estimation is an important part of digital signal processing. At present, high-precision frequency estimation has been successfully applied in radar detection, sonar seismic monitoring, bridge vibration detection and electronic communication technology. Therefore, research on high-precision frequency estimation algorithms has been widely attention. [0003] In terms of frequency estimation, Li Xiaojie et al. proposed a maximum likelihood (ML) estimation method combining FFT to determine the coherent integral length and unwinding sequence in the paper "High-precision Complex Sine Frequency Estimation Algorithm under Low SNR". However, this method requires a large amount of calculation. The Chinese Taiwan patent with the application...

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Application Information

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IPC IPC(8): G01R23/02G01R23/16
CPCG01R23/02G01R23/16
Inventor 宗竹林杨梦君朱立东高洁周龙杰田甜舒兆伟
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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