Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1984-03-12
1987-06-16
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342425, G01S 502
Patent
active
046739440
ABSTRACT:
A direction-finding interferometer (100) includes a novel autocalibration subsystem using bi-directional transmissions at a common frequency. The interferometer determines direction using a primary phase comparator (15) to assess the phase differences in signals transmitted by signal channels (13) from multiple antennas (11). The signal channels may include RF amplifiers (17), mixers (19) coupled to a local oscillator (23), IF amplifiers (21), and transmission lines.
The autocalibration subsystem employs a frequency synthesizer (25) as a calibration signal source. The calibration signal path is directed between reversing switches (40) and couplers (33) in alternating directions via transmission lines (57 and 59). In either direction, the calibration is split so that part of the signals are coupled into the signal channels, and the remaining part is directed to a secondary phase comparator (131). The outputs of the primary and secondary comparators provide the data necessary for autocalibration.
Other embodiments provide for a secondary comparator operating at a frequency range similar to that of the primary comparator. Gain autocalibration is also described.
REFERENCES:
patent: 3886555 (1975-05-01), Royal
patent: 3900879 (1975-08-01), Lewinter
patent: 3922533 (1975-11-01), Royal
patent: 3935574 (1976-01-01), Pentheroudakis
patent: 4494118 (1985-01-01), Graves
patent: 4509052 (1985-04-01), Cash
patent: 4532515 (1985-07-01), Cantrell et al.
Blum Theodore M.
Hughes Aircraft Company
Karambelas A. W.
Meltzer M. J.
Sawyer, Jr. J. A.
LandOfFree
Autocalibrating interferometer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Autocalibrating interferometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Autocalibrating interferometer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-686417