Using comparison of [1] the phase of the envelope of the change

Official title: using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna

G01S1/38 (Using comparison of [1] the phase of the envelope of the change) appears on 54 US grants and 18 published applications in this corpus.