Cryptography – Communication system using cryptography – Wireless communication
Patent
1987-07-17
1990-09-11
Buczinski, Stephen C.
Cryptography
Communication system using cryptography
Wireless communication
380 9, 380 10, 375 97, 375 98, 455136, 455316, H04B 702, H04B 110
Patent
active
049568647
ABSTRACT:
A receiver utilizing a plurality of small paraboloid antennas in lieu of a single large antenna of equal area, each antenna connected to a separate phase coherent heterodyne receiver channel includes a main channel and branch channels, the channels being summed to provide a carrier phase locked loop local oscillator signal that is distributed to all channels producing phase coherent IF signals in all the channels. These are summed to enhance the carrier margin or dB from the sensitivity threshold, of the system combining the receiver channels, to a level greater than that of the single antenna of equivalent area with its single receiver. The tendency toward cycle slipping near threshold is further reduced by providing summed additional amplified uncorrelated predetection receiver noise in the IFs of the branch receiver coupled to the main receiver. The modulation spectra of the receiver channels are demodulated and summed to provide an output signal-to-noise ratio related to the sum of the effective areas of the plurality of smaller antennas. A digital phase locked loop bandwidth controller adjusts the sensitivity of the combined channel system to the received signal level, increasing the dynamic range of the system. The separate channel architecture of the receiver enables secure communications techniques including frequency diversity encoding, polarization diversity encoding, frequency reuse and data stream segment interleaving and multiplexing.
REFERENCES:
patent: 3383599 (1968-05-01), Miyagi
patent: 3593147 (1971-07-01), Gurak et al.
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patent: 4186347 (1980-01-01), Brockman et al.
patent: 4210871 (1980-07-01), Hill et al.
patent: 4334316 (1982-06-01), Tanaka
Buczinski Stephen C.
English James T.
Gregory Bernarr Earl
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