Joint-Bin Monopulse Processing of Rayleigh Targets


Amplitude comparison monopulse systems offer precision angle localization of a target. In follow, the in-part part of the monopulse ratio is often used for direction-of-arrival (DOA) estimation thanks to simplicity and computational speed, however it suffers poor performance for off-boresight and/or low signal-to-noise ratio (SNR) targets. Target energy is usually assumed to be contained in a very single vary bin, whereas in observe the matched filter sampling method often ends up in multiple adjacent matched filter samples with target energy. Within the ancient radar literature, this can be referred to as bin straddling and is typically treated as a nuisance—an undesired loss of signal energy. Recent literature has addressed bin straddling for DOA and range estimation for the case of multiple unresolved targets. However, error variance reports on those target estimates, that are needed by target tracking algorithms, aren't provided. Furthermore, target strength is assumed to be a known parameter, which is typically not valid in observe. Here, we have a tendency to explicitly incorporate sampling into the statistical model for sum and difference channel signal samples, and derive estimators for the unknown vary and unknown DOA of one Rayleigh target. Closed-form Cramér-Rao lower bounds (CRLBs) on those estimators are provided. Furthermore, we propose the generalized CRLB (GCRLB) as a mistake variance report, and SNRs required for statistical potency and variance consistency are provided.

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