초록 ▼

A system for polyphase encoding transmitted pulses of energy and for decoding the received signals to enhance returns from the range interval being examined during a particular processing period and attenuate returns from contiguous range intervals (pulse compression). The system includes a decoding

A system for polyphase encoding transmitted pulses of energy and for decoding the received signals to enhance returns from the range interval being examined during a particular processing period and attenuate returns from contiguous range intervals (pulse compression). The system includes a decoding device which comprises a delay circuit having N distributed outputs including its input for producing a uniform delay between adjacent outputs corresponding to N inputted elements of a received phase-coded signal of length N2; a conjugator circuit coupled to the first N/2 successive outputs of the delay circuit; a first signal-combining circuit coupled to the conjugator circuit and to the last N/2 successive outputs of the delay circuit; a multiplier circuit coupled to the first signal-combining circuit; and a second signal-combining circuit coupled to the multiplier circuit. The decoding device provides a decoding phase shift -Dfk,p to the signal elements of the phase-coded signal wherein Dfk,p=-(2p

대표청구항 ▼

A decoding device comprising: means for providing a decoding phase shift -Dfk,p to the signal elements of a transmitted phase-coded signal reflected from a reflector to examine a range interval corresponding to the area containing the reflector, wherein Dfk,p=-(2p)[k-½(N-1)][p-½(N-1)] is the phase o

A decoding device comprising: means for providing a decoding phase shift -Dfk,p to the signal elements of a transmitted phase-coded signal reflected from a reflector to examine a range interval corresponding to the area containing the reflector, wherein Dfk,p=-(2p)[k-½(N-1)][p-½(N-1)] is the phase of the pth code element in the kth subgroup and k=0, 1, 2, . . . , N-1 p=0, 1, 2, . . . , N-1, and N is an even integer; and means for adding the phase-shifted signal elements at the same time to produce a narrow pulse with an accompanying increase in effective peak signal.