Coherent detection architecture for remote calibration of cohere

Details Coherent detection architecture for remote calibration of cohere Coherent detection architecture for remote calibration of cohere

1996-10-25

1998-09-15

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

375200, 375228, 342174, 342360, H04B 1500, H04B 1700, G01S 1300, H01Q 300

Patent

active

058090630

ABSTRACT:
An architecture that provides for coherent detection of the relative amplitude and phase of a calibration signal used in the remote calibration of an active transmitting or receiving phased array system employs two coherent signals, one being a reference signal and the other being the calibration signal that contains the relative amplitude and phase information desired in the calibration process. Direct sequence spread spectrum techniques are used to transmit the two coherent signals. Continuous time binary antipodal waveform signals are generated and used to transmit the reference and calibration signals. Relevant amplitude and phase information needed for the calibration can be extracted while compensating for non-synchronized oscillators and the effects of Doppler shifts due to relative motion of the transmitting and receiving platforms. The detection architecture is effective for satellite-based phased array systems, including geostationary, medium and low earth orbit communication satellites, and space-based synthetic aperture radar reconnaissance satellites.

REFERENCES:
patent: 4621365 (1986-11-01), Chui
patent: 4675880 (1987-06-01), Davarian
patent: 5530449 (1996-06-01), Wachs et al.
patent: 5559519 (1996-09-01), Fenner
patent: 5677696 (1997-10-01), Silverstein et al.
R.L. Pickholtz et al., "Theory of Spread-Spectrum Communications-A Tutorial", IEEE Transactions on Communication, vol. COM-30, No. 5, May 1982.
R.L. Pickholtz et al., "Revisions to Theory of Spread-Spectrum Communications-A Tutorial", IEEE Transactions on Communication, vol. COM-32, No. 2, Feb. 1984.
D.V. Sarwate et al., "Crosscorrelation Properties of Pseudorandom and Related Sequences", Proceedings of the IEEE, vol. 68, No.1 5, May 1980.
W.K. Pratt et al., "Hadamard Transform Image Coding", Proceedings of the IEEE 57, No. 1 (Jan. 1969), pp. 58-68.

Affiliated with

Also associated with

Rating

Coherent detection architecture for remote calibration of cohere does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coherent detection architecture for remote calibration of cohere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent detection architecture for remote calibration of cohere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-96601