Accession Number : AD0674033

Title :   NONLINEAR PROCESSING OF RADAR RETURNS IN MTI SYSTEMS,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Nishikawa,S.

Report Date : MAR 1968

Pagination or Media Count : 57

Abstract : An analysis of the effect of two nonlinear devices for processing coherent radar returns on the performance of a moving-target indication (MTI) system. A linear MTI processor--the optimum detector for moving targets when clutter is homogeneous gaussian process--is not optimum when clutter is a nonhomogeneous process, as is typical of terrain, where clutter amplitude varies widely between resolution cells. Some constant false-alarm rate (CFAR) technique must be used to prevent ground clutter from causing false alarms or low signal detectability. One method of achieving CFAR is by amplitude limiting before MTI cancellation. This study analyzes, quantitatively, the degradation in performance due to limiting, assuming a homogeneous clutter model. The analysis shows that a hard limiter, which destroys all amplitude information, severely degrades the system performance when the ground clutter has a Rayleigh amplitude distribution. A partial limiter, followed by an MTI canceller, is a better choice. (Author)

Descriptors :   (*MOVING TARGET INDICATORS, RADAR CLUTTER), COHERENT RADAR, RADAR REFLECTIONS, PROCESSING, NONLINEAR SYSTEMS, LIMITERS, PROBABILITY, OPTIMIZATION, RADAR PULSES, ERRORS, COMPUTER PROGRAMS, MATHEMATICAL MODELS

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE