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The sections in this article are Adaptive Radar Fundamentals Statistical Model for Adaptive Radar Optimum Adaptive Processing Space–Time Adaptive Processing Adaptive Detection Adaptive Weight Computation Adaptive Radar Estimation Conclusions
The sections in this article are Adaptive Radar Fundamentals Statistical Model for Adaptive Radar Optimum Adaptive Processing Space–Time Adaptive Processing Adaptive Detection Adaptive Weight Computation Adaptive Radar Estimation Conclusions
zongbo wang, oleg a. krasnov, galina p. babur, leo p. ligthart and fred van der zwan This paper presents the development of a reconfigurable receiver to undertake challenging signal processing tasks for a novel polarimetric radar system. The field-programmable gate arrays (FPGAs)-based digital receiver samples incoming signals at intermediate frequency (IF) and processes signals digitally instead of using conventional analog approaches. It offers more robust system stability and avoids unnecessary multichannel calibrations of analog circuits for a full polarimetric radar. Two kinds of dual-orthogonal signals together with corresponding processing algorithms have been investigated; the digital implementation architectures for all algorithms are then presented. Processing algorithms implemented in FPGA chips can be reconfigured adaptively regarding to different transmitted waveforms without modification of hardware. The successful development of such reconfigurable receiver extends our radar capacity and thus yields tremendous experimental flexibility for atmospheric remote sensing and polarimetric studies of ground-based targets.Keywords: Radar signal processing and system modeling, Radar architecture and systems I . I N T R O D U C T I O NPolarimetric information can be used to improve the radar performance for target detection, identification, and parameters estimation. It has been widely used in many application areas such as terrain observation, disaster surveillance, and atmospheric remote sensing [1][2][3]. The full polarimetric nature of electromagnetic wave information can so be obtained by measuring the full polarimetric backscattering matrix (BSM) from a target by transmission and reception of two orthogonal polarizations. In this paper we focus our attention on two orthogonal linear polarizations, i.e. horizontal and vertical polarization. In the majority of existing radars with polarimetric capabilities, pulse-to-pulse based switching of the transmitted and/or received polarization is used to measure the elements of the scattering matrix and the BSM is measured in a sequence of two measurements. This introduces temporal, frequency, and phase ambiguities in the polarimetric results.To overcome the limitation created by polarimetric switching, the PARSAX (Polarimetric Agile Radar for S-and Xbands) radar has been developed at IRCTR, TU Delft [1]. The PARSAX radar is a continuous wave (CW) radar system and provides the special capacity of simultaneous BSM measurement. It simultaneously transmits and receives periodic signals with dual-orthogonality both in polarimetric and in time-frequency spaces within the periodicity time interval. Such types of transmitted signals provide the unique possibility to split all elements of the BSM and to measure all of them simultaneously within one single periodicity time interval. The four complex elements of the BSM can be retrieved on reception by processing the received signals on each polarization channel with different reference signals. Many types of sophisticat...
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