Pulse or digital communications – Repeaters – Testing
Patent
1991-10-08
1992-08-18
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
H04K 100
Patent
active
051406101
ABSTRACT:
A video data link system utilizes spread spectrum to decrease the susceptlity of a low power video link to radio frequency countermeasures. The video data link system utilizes a combination of spread spectrum direct-sequence modulation and frequency-hop along with frequency modulation to provide spectral spreading of radio frequency energy to a bandwidth much greater than the information bandwidth. The direct sequence modulation allows minimization of the number of frequency steps required for complete spectral filling of the operational bandwidth on an average basis. Frequency hop timing is determined from the phase of the direct sequence generator to simplify the frequency hop synchronization process in the receiver. Bandwidth of the fm video signal, after being spread in spectral width by the bi-phase direct sequence signal, is approximately equal to the direct pseudo random sequence clock rate. Spacing of the frequency hop step is matched to the direct sequence bandwidth to relate each frequency stepped subcarrier harmonically to the fundamental sequence clock, thereby allowing simpler generation of the de-hop sub-carriers in the receiver.
REFERENCES:
patent: H484 (1988-06-01), Holliday
patent: 3766477 (1973-10-01), Cook
patent: 4255810 (1981-03-01), Solomon et al.
patent: 4513288 (1985-04-01), Weathers et al.
patent: 4580139 (1986-04-01), Weathers et al.
Holliday Edward M.
Kirshtein Phillip M
Weathers Glenn D.
Bush Freddie M.
Cangialosi Salvatore
Nicholson Hugh P.
The United States of America as represented by the Secretary of
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