UDC 621.369.96

Algorithms of signal processing in radar angular coordinate detector-meters with scanning multi-channel antenna system

 

S. V. Kozlov, Vu Thanh Ha

Belarusian State University of Informatics and Radioelectronics, P.Brovki str., 6, Minsk 220013, Republic of Belarus

 

The paper is received on October 29, 2019, after correction - on November 13, 2019

 

Abstract. One- and two-stage algorithms of processing of the slowly and fast fluctuating reflected signals in the radar detector-meter of angular coordinates in the conditions of external masking interference in free space and in the presence of interfering reflections  with unknown parameters are given. The algorithms are based on the operations of spatial interference compensation in each repetition period,  estimating the Doppler frequency shift of interfering reflections, their coherent compensation, whitening of treatment results in the time domain. They are also based on the evaluating power and the inter-period correlation coefficient and subsequently taking into account the temporal correlation of the fluctuations of the reflected signal with the subsequent construction and maximization of the logarithm of the likelihood ratio function. We justify the algorithm for the most general case typical of practice, when the power of external interference is overwhelming and an accurate estimate of the unknown Doppler shift of interfering reflections is impossible and the power of the interfering reflections significantly exceeds the power of the useful signal. The processing is divided into two stages. The purpose of the first stage is to evaluate the Doppler shift of the interfering reflections and conducting coherent compensation of interfering reflections in each receiving channel. The purpose of the second stage is to compensate the external interference in the implementation with eliminated of interfering reflections and coherent and incoherent reflected signals accumulation with estimation of the angular coordinates. The results of modeling of the proposed algorithms are presented, indicating their efficiency and effectiveness.

Key words: spatial interference compensation, radar meter, angular coordinates, interfering reflections, reflected signal, multi-channel antenna system, likelihood ratio function.

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For citation:

Kozlov S.V., Vu Thanh Ha. Algorithms of signal processing in radar angular coordinate detector-meters with scanning multi-channel antenna system. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 11. Available at http://jre.cplire.ru/jre/nov19/10/text.pdf

DOI  10.30898/1684-1719.2019.11.10