Patent ID: 6411249
Filing Date: 2002-06-25
Classification: G01S

Abstract:
A method of associating a single pulse from an agile emitter with previously detected pulses from that emitter in a time interval less than the pulse repetition interval (PRI) of the radar comprising:storing ambiguous phases from the previously detected pulses from the same agile emitter; estimating a single cos(aoa) from a subset of the stored ambiguous phases; detecting a new ambiguous phase &phgr;m at frequency fm which frequency is different from at least one of the frequencies associated with the phases in the stored set, the phase measurement made between two antennas spatially separated by distance d, forming a set of differenced phases and corresponding differenced frequencies from the stored set, with at least one member of this set being the difference of the new ambiguous phase and frequency with one of the stored phases and its associated frequency; measuring the phase cycle measurement ambiguity integer resolving the phase difference formed from the new ambiguous phase utilizing this set of phase and frequency differences; computing the phase cycle measurement ambiguity integer resolving the new at ambiguous phase difference if the new pulse is from the same emitter as the stored set by utilizing the previously estimated cos(aoa) and newly measured frequency fm; and first comparing the measured and computed ambiguity integers, and associating the newly detected pulse with the previously stored pulses as being from the frequency agile emitter if the integers are equal.