Distance measuring receiver system and method
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United States of America Patent
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Jun 23, 1987
Issued Date -
N/A
app pub date -
Sep 19, 1986
filing date -
Oct 20, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A distance measuring receiver system and method for determining the distance of a receiving station from a transmitting station, which provides the distance information by the reception and processing of a pair of signals (preferably continuous wave carrier) transmitted by the transmitting station. The filter subsystem 106 supplies the upper signal to the first channel 501 and the lower signal to the second channel 502 of a lane expansion subsystem 108, which produces a plurality of difference frequency signals 113, 115, 117, 119 (of preselected multiples) in accordance with the upper and lower signals. A reference subsystem 112 in accordance with the oscillator signal 121 supplies a plurality of reference signals 127, 129, 131, 133 (having frequencies equal to the frequencies corresponding to difference frequency signals). By comparing the phase of corresponding difference frequency and reference signals, phase comparator subsystem 114 produces a plurality of measurement lanes of different lengths, which allow the present invention to zero in on the position of the receiving station. Substantial elimination of phase error to each signal caused by signal processing is achieved by the present invention.
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