The phenomenon of observation multiplicity for the phased-array radar is studied and a prepro cessing algorithm to eliminate the redundant observations is proposed.At first
the probabilities that redundant observations exist are derived.It is shown that these probabilities depend on signal-to-noise-ratio and the spacingbetween the adjacent beams.Second
a priori knowledge of the maximum number of observations to be merged and the maximum merging range is introduced to the pre-processing method.At last
the measurement’s error be fore and after mergence is calculated
and the performance of this method is compared with those methods without any limitations.