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Fourier transform LFM-BPSK composite modulation radar signal parameter estimation method

A technology of Fourier transform and composite modulation, which is applied in the field of radar signal processing, can solve problems not involving LFM-BPSK composite modulation signal parameter estimation, and achieve the effect of low complexity, high stability and improved accuracy

Pending Publication Date: 2020-02-07
HARBIN ENG UNIV
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Problems solved by technology

The patents "Line Frequency Modulation Signal Parameter Estimation Method Based on Wavelet Packet Denoising and Power Spectrum Entropy" and "DS / FH Spread Spectrum Signal Parameter Estimation Method Based on Cyclic Spectrum Theory" are also research signal parameter estimation algorithms, but do not involve LFM- The parameter estimation of BPSK composite modulation signal is different from the patent of the present invention

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  • Fourier transform LFM-BPSK composite modulation radar signal parameter estimation method
  • Fourier transform LFM-BPSK composite modulation radar signal parameter estimation method
  • Fourier transform LFM-BPSK composite modulation radar signal parameter estimation method

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Embodiment Construction

[0052] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0053] The main point of this method is to filter and reconstruct the signal and estimate the parameters of the LFM-BPSK composite modulation signal based on the interpolation optimization fractional Fourier transform and cyclic spectrum correlation algorithm. The steps of the scheme are as follows: figure 1 shown.

[0054] (1) The LFM-BPSK signal model can be expressed as:

[0055]

[0056] where f 0 is the initial frequency, k is the FM slope, k=B / T, B is the signal bandwidth, T=NT 0 is the signal duration, q(t) is the rectangular signal, T 0 is the symbol time width, φ 0 As a binary sequence, there are only two possible values ​​of 0 and π. The LFM-BPSK composite signal has the characteristics of both the LFM signal and the BPSK signal. Its time-domain waveform diagram and spectrum diagram are as follows: figure 2 shown.

[0057] (2)...

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Abstract

The invention discloses a Fourier transform LFM-BPSK composite modulation radar signal parameter estimation method, which belongs to the technical field of radar signal processing. The Fourier transform LFM-BPSK composite modulation radar signal parameter estimation method comprises the following steps: firstly, performing square processing on a LFM-BPSK composite modulation signal for removing phase code modulation; performing estimation calculation on the initial frequency and frequency modulation coefficient of a chirp signal based on an optimized fractional order Fourier transform algorithm of interpolation compensation; then reconstructing the chirp signal to obtain a baseband two-phase encoded signal; and finally, extracting the code rate of the two-phase encoded signal based on a cyclic spectral correlation algorithm. Since the interpolation optimized fractional order Fourier transform algorithm is used, the parameter estimation accuracy of the initial frequency and the frequency modulation slope of a composite signal is improved, and the estimation accuracy of the code element rate using the cyclic spectral correlation algorithm is also indirectly improved. The stability ofsignal parameter estimation is effectively improved by combining filtering processing and signal reconstruction. Simulation results of the parameter estimation show that the estimation accuracy and stability are still high at a low signal to noise ratio.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a Fourier transform LFM-BPSK composite modulation radar signal parameter estimation method. Background technique [0002] The LFM-BPSK composite modulation signal has the advantages of both the linear frequency modulation signal and the phase coding signal, and has better low intercept performance, and has been widely used in many radars. Its waveform is more complex, and the distribution of the frequency spectrum is similar to the chirp signal but more turbulent. Composite modulation radar signal is formed by combining multiple modulation methods, which can integrate the advantages of multiple signals and make up for their respective shortcomings. Compared with a single modulation type signal, the composite modulation signal can obtain a larger time-width-bandwidth product, and has better distance resolution and velocity resolution. The difficulty o...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/418
Inventor 张文旭范晓蕾赵忠凯孙富礼杜秋影姚雨双何俊希张恒张春光李广琦
Owner HARBIN ENG UNIV
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