Short-time FFT (fast Fourier transform) based signal processing method for acousto-optic passive receiver

A signal processing and receiver technology, applied in the field of real-time fast time-frequency analysis, can solve the problems of high real-time performance and poor real-time performance

Inactive Publication Date: 2014-12-17
CHINA ELECTRONICS TECH GRP NO 26 RES INST
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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art above, the signal processing method of the acousto-optic passive receiver based on short-time F

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  • Short-time FFT (fast Fourier transform) based signal processing method for acousto-optic passive receiver
  • Short-time FFT (fast Fourier transform) based signal processing method for acousto-optic passive receiver
  • Short-time FFT (fast Fourier transform) based signal processing method for acousto-optic passive receiver

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Embodiment Construction

[0042] The signal processing method of the acousto-optic passive receiver based on short-time FFT, such as figure 1 As shown, after the acousto-optic passive receiver receives the initial signal, it processes the initial signal as follows:

[0043] 1) short-time Fourier transform;

[0044]Add a Hamming window (ie Hamming window) to the initial signal x(t) and perform Fourier transform to obtain the transformed signal; where, the initial signal x(t)=s(t)+n(t), s(t) is an ideal signal, n(t) is white noise, and t is time;

[0045] 2) Carry out integral accumulation and high-speed synchronous sampling on the converted signal to obtain the intermediate signal matrix;

[0046] 3) Perform restoration processing and tracking correlation on the intermediate signal matrix to establish a time-frequency function; use the data table query method to determine the type of time-frequency function, restore the characteristic parameters of the time-frequency function, and use the restored sig...

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Abstract

The invention provides a short-time FFT (fast Fourier transform) based signal processing method for an acousto-optic passive receiver. The acousto-optic passive receiver performs short-time Fourier transform on an initial signal to acquire a transformed signal after receiving the initial signal, and performs integral accumulation and high-speed synchronous sampling on the transformed signal to acquire an intermediate signal matrix; the intermediate signal matrix is finally subjected to restoration and tracking correlation, and a time frequency function is created; a data table inquiry mode is adopted, the type of the time frequency function is judged, all parameters of the time frequency function are restored, and a restored signal is taken as a final output signal of the acousto-optic passive receiver and is sent to a user. Real-time performance can be guaranteed by the method, a filter is not needed during overall signal processing, and the process is simple.

Description

technical field [0001] The invention belongs to the technical field of electronic engineering, and mainly relates to a real-time fast time-frequency analysis technology for an acousto-optic passive receiver. Background technique [0002] The radar reconnaissance system is a device that uses passive reception and signal processing technology to detect and identify the signal environment of radar radiation sources, measure and analyze radar signals and operating parameters, and obtain useful information from them. He can intercept, analyze, identify and locate electromagnetic radiation signals of radar and communication stations in the combat zone. [0003] The radar reconnaissance receiver is the core equipment of the radar reconnaissance system, which is used to receive electromagnetic radiation signals from radar and communication stations. Radar reconnaissance receivers include analog reconnaissance receivers and digital reconnaissance receivers. Compared with analog reco...

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Application Information

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IPC IPC(8): G01S7/295G01S7/40
CPCG01S7/285G01S7/352
Inventor 陈永峰吴冉张泽红廖婷
Owner CHINA ELECTRONICS TECH GRP NO 26 RES INST
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