AUTOMATIC PRF SELECTION TO OPTIMIZE RANGE AND DOPPLER VISIBILITY IN RADAR TRACKING

摘要

A radar system is disclosed which uses an established track predicted range, Rp, and radial velocity, Rp, of a target to select a frequency, F, and PRF for optimum range and doppler visibility in tracking. The procedure is to tentatively select a frequency not subject to interference; determine the highest possible band of PRF's allowable between adjacent velocity blind regions computed from the equation (PRF) = 2RpF/cn +/- DELTA (PRF) where DELTA (PRF) is a known half width of velocity blind regions from their centers, c is the speed of light, and n= 1,2,3 . . .; determine the highest PRF within the allowable band which places the target outside of range blind zones between Rn and Rn+ delta , where delta is the width of blind zones and Rn for the nth blind zone is determined from the equation Rn = cn/2(PRF) where n= 1,2,3 . . . . A preliminary check determines whether the predicted range of the target is in a known range blind zone delta ' at the origin. If a PRF with range visibility is not found in an allowable band, another lower allowable band of PRF's is found, if any, and checked for range visibility until a useful PRF is found or all possibilities have been checked. In the latter case, another frequency is selected and the process is repeated until a useful PRF is found or all frequencies have been checked.