Patent ID: 6111537
Filing Date: 2000-08-29
Classification: G01S

Abstract:
A method for reducing false target echo indications (F.sub.c) in detections in a pulse Doppler radar, which radar employs at least two different pulse repetition frequencies (PRF.sub.1, PRF.sub.2) during the period in which the main beam of the radar illuminates a target, and which radar has a number of range gates which are supplied with a signal representing a primary detected target in each PRF in which the target has been detected, which method comprises the use of at least one variable criterion and a final criterion, which criteria are both of the M/N type, comprising the following steps:a approving primary detections which are all to be found in the same range gate in a number, M, of PRF's, which number is equal to the factor M in the variable criterion;b removing the approved primary detections and all other corresponding primary detections from further processing;c subtracting a predetermined number from the number M in the variable criterion; andd repeating steps (a) through (c) until the number M reaches a predetermined lower threshold.