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This paper describes the AN/APN-l53 (V) Doppler Radar Set, which is a state-of-the-art self-contained navigation sensor that can be utilized in many types of aircraft. The techniques used in the APN-153 that are significant advances over other Doppler systems are discussed in detail. The U. S. Navy has selected the APN-153 to be used on many of its operational aircraft. This selection was made on the basis of extensive environmental and flight tests conducted by the Navy on the APN-153 in competition with systems of three other leading Doppler manufacturers.