Communications: directive radio wave systems and devices (e.g. – Determining distance – With pulse modulation
Patent
1981-07-07
1990-03-13
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With pulse modulation
342 68, G01S 1318
Patent
active
049086286
ABSTRACT:
A radar apparatus transmits a pulse and receives a corresponding return within the duration of the transmitted pulse. The returned pulse and a proportion of the energy of the transmitted pulse are mixed in a mixer to produce a demodulated pulse of duration equal to the overlap in time of the transmitted and received pulses. In order to render the apparatus insensitive to close targets a video gate prevents the portion of the demodulated pulse corresponding to e.g. 0 to 1/4 full range passing to a processing circuit. The processing circuit forms the ratio of the amplitudes of two frequency components of the spectrum of the demodulated pulse as a measure of range (FIG. 3) or forms the mean amplitude of the demodulated pulse weighted according to a weighting function (FIG. 4).
REFERENCES:
patent: 3076191 (1963-01-01), Williams
patent: 3142058 (1964-07-01), Rhodes
patent: 3353179 (1967-11-01), Cartwright
patent: 4310842 (1982-01-01), Siebeneck et al.
Cashen Ernest R.
Holder Peter A. R.
E M I Limited
Tubbesing T. H.
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