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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Roberts; James L.
Address:
Seattle, WA
No. of patents:
5
Patents:












Patent Number Title Of Patent Date Issued
5200931 Volumetric and terrain imaging sonar April 6, 1993
A method and apparatus for the generation of a three-dimensional image representing structures detected within a volume. Two dimensional differential phase measurements are made on backscatter signals. Azimuth, elevation and range are calculated over a statistically large number of s
4972441 Enhanced pulse time-of-arrival detector November 20, 1990
A detector for detecting a communication pulse in the presence of noise is disclosed having a transmitter for transmitting a communication pulse of carrier frequency having a main pulse portion and a pre-pulse portion, the pre-pulse portion being of substantially opposite phase to the ma
4071821 Quadrature correlation phase determining apparatus January 31, 1978
Digital apparatus and a method are disclosed for determining the phase angle of a tone signal of known frequency by correlating a clipped version of the tone signal with a reference signal having a repetition rate equal to the tone frequency. Correlation is accomplished by multiplying th
4038540 Quadrature correlation pulse detector July 26, 1977
Digital apparatus and a method are disclosed for detecting a tone pulse of known carrier frequency in a signal in which random noise is present by correlating a clipped version of the input signal with a square wave reference signal having a repetition rate equal to the carrier frequency
4004235 Phase-locking midpulse detector January 18, 1977
Apparatus, in a receiver, for detecting the mid-pulse phase reversal of an nput signal s(t) = a(t).sub.BLT cos (.omega..sub.c t + .theta.). The signal a(t).sub.BLT is a modulating signal a(t), having a phase-reversal at its midpoint, after band-limiting by a transmitter, and cos (.omega..










 
 
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