Accession Number:

ADA330556

Title:

Monopulse Processing for Tracking Unresolved Targets

Descriptive Note:

Corporate Author:

NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA

Personal Author(s):

Report Date:

1997-09-01

Pagination or Media Count:

205.0

Abstract:

When target echoes Interfere in a monopulse radar system, the Direction of Arrival DOA estimate indicated by the in-phase monopulse ratio can wander far beyond the angular separation of the targets. In addition to closely spaced targets, the problem of unresolved or merged measurements also occurs when targets are observed in the presence of jammer signals or sea surface induced multipath. The failure to detect the presence of this interference and address it in the DOA estimation can be catastrophic to the performance of the tracking algorithm, since its position and velocity estimates determine the association of any subsequent measurements to the target. Monopulse processing for tracking unresolved targets is addressed in four pans. The first pan involves the development of the Probability Density Function PDF and statistics of the measured amplitude of the sum signal for an arbitrary number of unresolved Rician targets. The PDF and statistics are utilized to develop estimators of the target amplitude parameters, which define the Signal to Noise Ratio SNR of the target and discriminators for models of the target amplitude fluctuations. The second part involves the development of the joint PDF and statistics of the complex monopulse ratio for an arbitrary number of unresolved Rician targets and a fixed amplitude target in the presence of multipath.

Subject Categories:

  • Active and Passive Radar Detection and Equipment
  • Target Direction, Range and Position Finding

Distribution Statement:

APPROVED FOR PUBLIC RELEASE