Accession Number : ADA330556

Title :   Monopulse Processing for Tracking Unresolved Targets

Corporate Author : NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA

Personal Author(s) : Blair, W. D. ; Pearce, M. Brandt

PDF Url : ADA330556

Report Date : SEP 1997

Pagination or Media Count : 205

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.

Descriptors :   *RADAR TRACKING, *MONOPULSE RADAR, *RADAR TARGETS, ALGORITHMS, SIGNAL PROCESSING, SIGNAL TO NOISE RATIO, ANGLE OF ARRIVAL, TARGET DISCRIMINATION, PROBABILITY DENSITY FUNCTIONS, RADAR CROSS SECTIONS, MULTIPATH RADAR, RADAR JAMMING, TARGET ECHOES, THEATER MISSILE DEFENSE.

Subject Categories : Active & Passive Radar Detection & Equipment
      Target Direction, Range and Position Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE