Pulse or digital communications – Repeaters – Testing
Patent
1984-05-18
1986-12-16
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 22, 375 58, 370 11, H04L 902
Patent
active
046302824
ABSTRACT:
Ordinary digital data is reformed and time shifted such that it may be broadcast over a radio link which periodically shifts its frequency. The system of this invention utilizes timing information obtained from a pre-existing frequency-hopping radio link in conjunction with its own buffer and control circuitry to accurately time-position discrete digital data packets within those time bands of the radio transmission wherein the frequency is not changing from one frequency to another. In the drawing, T.sub.H1 is a very short duration pulse which commands the AM frequency--hopping system to shift frequencies. The time period necessary for the frequency hop operation to settle down and attain a stable frequency is represented by the interval between T.sub.H1 and T.sub.1. The actual reception of the uplink message occurs in the interval between T.sub.3 and T.sub.4 ; transmission of the downlink signal from the system occurs in the interval between T.sub.5 and T.sub.6. The interval between T.sub.4 and T.sub.5 is a necessary pause at the actual station. The intervals between T1 and T3 and T6 and T allow for other delays such as slant range differences between stations, propagation delays, and timing offsets between stations.
REFERENCES:
patent: 3916313 (1975-10-01), Lowry
patent: 4164628 (1979-08-01), Ward et al.
patent: 4231113 (1980-10-01), Blasbalg
patent: 4268721 (1981-05-01), Nielson et al.
"Frequency Hopping Systems", Digital Communications by Satellite, Bhargava et al., Wiley & Sons, 1981, p. 275.
Hawkey Lynn J.
Landers William A.
Cone Gregory A.
Finch George W.
Glenny Raymond C.
Griffin Robert L.
McDonnell Douglas Corporation
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