초록 ▼

A range-gated radar system which includes a phase modulator that modulates an r.f. generator with a signal which may be binary coded. In a preferred embodiment, the binary signal is a periodic signal of 2N-1 bits per period. Starting at some arbitrary point in the sequence, K contiguous bits are tra

A range-gated radar system which includes a phase modulator that modulates an r.f. generator with a signal which may be binary coded. In a preferred embodiment, the binary signal is a periodic signal of 2N-1 bits per period. Starting at some arbitrary point in the sequence, K contiguous bits are transmitted then M contiguous bits are passed over, then K more bits are transmitted, and so on. The quantities M+K and 2N-1 have no primary factors in common. The radar system may be a doppler radar system using balanced digital processing which involves separating the upper and lower sideband components of modulation that exist in the return radar signal as a result of the motion of scatterers and subtracting them.

대표청구항 ▼

A range-gated radar system including an antenna and transmit-receive device which comprises: a source of r.f. energy; a source of a coded binary signal; and means for phase-modulating said r.f. energy source with said coded binary signal; said coded binary signal source comprising means for generati

A range-gated radar system including an antenna and transmit-receive device which comprises: a source of r.f. energy; a source of a coded binary signal; and means for phase-modulating said r.f. energy source with said coded binary signal; said coded binary signal source comprising means for generating a periodic bit sequence having 2n-1 bits per period, where N is any integer greater than one; means for selecting K contiguous bits from said sequence starting at some arbitrary point in the sequence; means for passing over the next M contiguous bits in said sequence wherein 1≤K≤M and wherein (2N-1) and (K+M) have no prime factors in common.