TARGET DETECTION IN LOW ENR

Abstract

MULTIPLE TARGET DETECTION IN LOW ENR MUHAMMAD MOAZ RAIS The problem of detection and identification of multiple low observable targets in a heavily cluttered environment is the primary focus of this thesis. The work deals with a novel approach for detecting multiple targets i.e. use of higher order statistics for pattern recognition of a possible target. Pulsed radar transmits short burst of electromagnetic energy, in the form of coded sequence after which the receiver is turned on to listen for the echo. . The echo not only indicates that a target is present, but the time that elapses between the transmission of the pulse and the receipt of the echo is a measure of the distance to the target and relative frequency difference between the transmitted echo and received echo is a measure of the Doppler information of the target. In the highly noisy environment, the radar signals are much attenuated when they reach the target and return to the receiver. Secondly in case of close multiple targets side lobes of stronger target affects the detection of weaker target.Thirdly if the length of the coded sequence is small ,then the range resolution of the targets becomes coarse. Complementary-coded pulse radar may be a solution in the sense that it transmits complementary-coded pulses and compresses the received pulses so that highly effective transmitted power, fine-range resolution, and low sidelobes level can be achieved simultaneously.