Communications: directive radio wave systems and devices (e.g. – Determining distance – Altimeter
Patent
1987-06-23
1988-08-23
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Altimeter
342128, G01S 1326
Patent
active
047664363
ABSTRACT:
This radar device for measuring the distance h of the device to a surface (2) includes transmission means (5) for transmitting to the surface a frequency-modulated wave E(t) provided by an oscillator (14) having a frequency control, receiving means (7) for receiving this wave R(t) reflected from the surface, a mixer circuit (10) for producing a beat wave between the transmitted and received waves and a processing circuit (20) including a beat-wave-digitizing circuit (25) and a time-frequency transform operator (27) for supplying frequency components from which the distance h is determined. This processing circuit (20) further includes an auto-correlation operator for effecting an auto-correlation of the beat wave digitized by the circuit (25) and also spectrum processing means (32) for finally determining the distance h.
REFERENCES:
patent: 4078234 (1978-03-01), Fishbein et al.
patent: 4107679 (1978-08-01), Strauch et al.
patent: 4205314 (1980-05-01), Strauch
patent: 4568938 (1986-02-01), Ubriaco
patent: 4599618 (1986-07-01), Haendel et al.
patent: 4620192 (1986-10-01), Collins
Crepin Hugues
Hethuin Serge
Hellner Mark
Kraus Robert J.
Tubbesing T. H.
U.S. Philips Corporation
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