Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Patent
1997-07-11
1999-07-13
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
342354, 342372, G01S 316, H04B 7185, H01Q 322
Patent
active
059232927
ABSTRACT:
RF signal nulling and loss of RF lock (i.e., loss of a communications or command link) is resolved by changing the phase of signals derived from first and second (+Z and -Z) antennas so that they add in phase instead of canceling. This is accomplished automatically by using a computer or processor to measure the RF signal level output by a receiver and change the phase of the incoming signal using a phase shifter to achieve the highest level. A squelch circuit in the receiver is used to determine the maximum obtainable RF signal level. The squelch level is compared in a computer to a threshold when the system looks for a higher squelch level. The phase of the phase shifter is changed using a computer to maximize the received signal level. A feedback loop from the receiver through the computer to the phase shifter provides a path to shift the phase of the incoming RF signal in one of the paths so the respective signals add instead of cancel, which eliminates the signal nulling problem.
REFERENCES:
patent: 3134896 (1964-05-01), Briggs
patent: 3568197 (1971-03-01), Cubley
patent: 4298873 (1981-11-01), Roberts
Float Kenneth W.
Issing Gregory C.
Space Systems Loral, Inc.
LandOfFree
Dual antenna null elimination does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual antenna null elimination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual antenna null elimination will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2279923