Terahertz cloud radar signal processing method and system

Abstract

The invention provides a terahertz cloud radar signal processing method and system. The method includes that a data acquisition module acquires the terahertz wave cloud radar echo signal; the data preprocessing module preprocesses the terahertz cloud radar echo signal; the data processing module performs power spectrum estimation and spectral averaging on the preprocessed signal; and attenuation correction and parameter estimation are carried out. By means of the combination of the time-domain accumulation and high-performance window pulse compression with two-dimensional FFT transformation, the large bandwidth and high resolution functions of the pulse compression system can be effectively played, and the clutter can be efficiently suppressed. A Liebe atmosphere model is adopted to observe the weather status and the terahertz attenuation characteristics according to a terahertz radar, and the echo power estimation at the signal processing part can be effectively corrected. Therefore, the chirp signal characteristic can be fully utilized, the low emission peak power terahertz wave cloud radar detection capability is improved, the clutter impact is influenced, and the problem that the atmosphere is inaccurate in the echo power estimation caused by the terahertz waveband attenuation can be eliminated.

Description

technical field [0001] The invention relates to the technical field of terahertz active weather radar, and is applicable to the signal processing of cloud radar with a frequency modulation system for transmitting and receiving separation. Background technique [0002] Meteorological remote-sensing radars for measuring cloud meteorological elements are currently mainly concentrated in the X, Ka and W bands, and these cloud radars usually use a simple pulse system or a pulse Doppler system. Internationally, the University of Massachusetts in the United States has developed cloud radars in the 215GHz and 225GHz bands, which also use a simple pulse system and the system is non-coherent. There have been no reports of actual terahertz band cloud radar in China. Due to the limitation of the transmission power in the terahertz band and the isolation function of the transceiver, the terahertz cloud radar with a wide pulse chirp system with separate transceivers makes it possible to ...

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Problems solved by technology

[0004] The present invention provides a terahertz wave cloud radar echo signal processing method and system based on a transmission and reception separation linear frequency modulation system, which fully utilizes the characteristics of the linear frequency modulation signal to improve the detection capability of the low emission peak power terahertz wave cloud radar and reduce the influence of clutter And eliminate the inaccurate estimation of the echo power caused by the attenuation of the terahertz band by the atmosphere

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