Communications: directive radio wave systems and devices (e.g. – Determining distance – Altimeter
Patent
1989-06-29
1990-09-18
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Altimeter
342128, 342120, G01S 1334, G01S 1336
Patent
active
049581619
ABSTRACT:
The radar system of the FM/CW type transmits a wave which has a virtually linear frequency, between two frequencies f.sub.1 and f.sub.2 and supplies a first beat signal (Fb.sub.1) between transmitted and received waves; it is suitable for measuring the altitude h by measuring the overall phase rotation. According to the invention the radar supplies a second beat signal (Fb.sub.2) in quadrature with the first signal; the signals Fb.sub.1 and Fb.sub.2 are digitized (23 to 26) and comparing means (36) compare the consecutive samples of Fb.sub.1 and Fb.sub.2, then calculating means (37) derive therefrom by means of successive increments/decrements the number of zero crossings of the phase plane in a predetermined direction minus the number of zero crossings in the opposite direction (result m). The calculated altitude h is proportional to m.
REFERENCES:
patent: 3860925 (1975-01-01), Darboven, Jr.
patent: 4023171 (1977-05-01), Stavis
patent: 4107681 (1978-08-01), Robertson et al.
patent: 4620192 (1986-10-01), Collins
patent: 4739330 (1988-04-01), Lazarus
patent: 4860014 (1989-08-01), Shores et al.
Kraus Robert J.
Sotomayor John B.
Tarcza Thomas H.
U.S. Philips Corporation
LandOfFree
Frequency-modulated continuous-wave radar altimeter system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency-modulated continuous-wave radar altimeter system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency-modulated continuous-wave radar altimeter system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1574349