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Method for estimating Doppler spectrum of radar target on basis of phase analysis

A Doppler spectrum and radar target technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of poor estimation accuracy and compensation of frequency difference, achieve high frequency resolution, and overcome the effects of fence effects

Inactive Publication Date: 2015-01-21
XIDIAN UNIV
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Problems solved by technology

In the present invention, the FFT phase analysis method is applied to the CAPES method, which uses the phase difference of the segmented data to compensate the frequency difference, and solves the problem of poor parameter estimation accuracy when the sine wave real frequency and discrete frequency sampling points are not aligned in the CAPES method.

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  • Method for estimating Doppler spectrum of radar target on basis of phase analysis
  • Method for estimating Doppler spectrum of radar target on basis of phase analysis
  • Method for estimating Doppler spectrum of radar target on basis of phase analysis

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Embodiment Construction

[0022] refer to figure 1 , is a flow chart of a radar target Doppler spectrum estimation method based on phase analysis in the present invention. The radar target Doppler spectrum estimation method based on phase analysis includes the following steps:

[0023] Step 1, the radar transmits a signal to the target and receives the echo data reflected by the target; the original echo data matrix W is obtained by using the echo data received by the radar,

[0024] W=[w 1 ,w 2 ,...,w z ,...,w Z ] T , where w z Represents the echo data vector received by the radar at the zth range cell, w z is an N-dimensional column vector, N is an even number, [·] T Indicates transposition; z ranges from 1 to Z, Z is the number of range units in a pulse repetition period of the radar, and N is the number of pulses contained in a coherent accumulation period, that is, the number of data corresponding to a range unit. It can be seen that W is a two-dimensional matrix with N rows and Z columns...

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Abstract

The invention belongs to the technical field of radar technologies and discloses a method for estimating the Doppler spectrum of a radar target on the basis of phase analysis. The method comprises the specific steps of sampling signals and equally dividing a sample sequence into two subsequences; carrying out spectrum analysis on the sample sequence by using a Capon method to obtain a rough measured frequency; calculating the complex amplitudes of the subsequences at the rough measured frequency respectively with an APES method, obtaining the phases of subsequence spectrums at the rough measured frequency through phase obtaining operation, and obtaining a phase difference through calculation; correcting the phase difference, and eliminating the integer ambiguity of frequency measurement to obtain the corrected phase difference; obtaining the estimated value of the actual frequency by calculating the deviation between the signal actual frequency and the rough measured frequency; calculating the complex amplitude of the sequences at the actual frequency by using the APES method to obtain the amplitude and phase estimation of the signals. Compared with a traditional CAPES method, the estimation precision of signal parameters is higher, and the method for estimating the Doppler spectrum of the radar target on the basis of the phase analysis can be applied to estimation of the frequency, the amplitude, the phase and the like of sine wave signals.

Description

technical field [0001] The invention belongs to the technical field of radar, and specifically discloses a method for estimating a high-precision radar target Doppler spectrum, which can be used for estimating parameters such as amplitude, frequency and phase of a complex sinusoidal echo signal in radar moving target detection. Background technique [0002] Estimation of the frequency of sine wave signal is an important problem in signal processing in the fields of communication, radar, sonar and electronic countermeasures. The traditional DFT (Discrete Fourier Transform) is widely used because it can adopt a fast algorithm, but the frequency resolution and frequency estimation accuracy of DFT depend on the measurement time length of the signal. [0003] In order to improve the parameter estimation accuracy of DFT, a Fourier transform (FFT) method based on phase analysis (FFT phase analysis method) is proposed, which uses the phase difference of the piecewise Fourier transfo...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 苏洪涛李龙刘宏伟刘子威胡勤振
Owner XIDIAN UNIV
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