Abstract
With the continuous advancement of electronic technology, terahertz technology has gradually been applied on radar. Since short wavelength causes severe ground clutter, this paper studies the amplitude distribution statistical characteristics of the terahertz radar clutter based on the measured data, and provides technical support for the radar clutter suppression. Clutter distribution is the function of the radar glancing angle. In order to achieve targeted suppression, in this paper, selected axial integral bispectrum (selected AIB) feature is selected as deep belief network (DBN)input to complete the radar glancing angle recognition and the network structure, network training method, robustness are analyzed also. The ground clutter amplitude distribution can follow normal distribution at 0~45° grazing angles. The Weibull distribution and G0 distribution can describe the amplitude probability density function of ground clutter at grazing angles 85° and 65°. The recognition rate of different signal grazing angles can reach 91% on three different terrains. At the same time, the wide applicability of the selected AIB feature is verified. The analysis results of ground clutter amplitude characteristics play an important role in the suppression of radar ground clutter.
Highlights
The rapid development of radar technology has continuously improved the detectability of radar systems, but the environment has a profound impact on target detection [1,2,3].The environmental interference of ground and sea clutter has always been a hot research issue
The clutter distribution models of the Rayleigh distribution, lognormal distribution and Weibull distribution are all based on single point statistics, so they are only suitable for single pulse detection
It is found that the degree of fit between the measured data amplitude distribution and the normal distribution is high at grazing angle 45◦
Summary
The rapid development of radar technology has continuously improved the detectability of radar systems, but the environment has a profound impact on target detection [1,2,3]. Researchers have proposed a variety of models based on topography, vegetation, water content, grazing angle, and signal frequency bands. The amplitude distribution characteristics of ground clutter are the basis of radar clutter suppression and play a key role in target detection. Measure THz ground clutter from alpine meadows, alpine dry grassland and alpine swamp and echo signal selected AIB are used as DBN network input to recognize grazing angle, to suppress clutter at different grazing angles. The bispectrum characteristics of ground clutter are studied. The amplitude distribution characteristics of ground echo at different grazing angles are analyzed.
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