Single channel tracking for frequency hopping communication syst

Details Single channel tracking for frequency hopping communication syst Single channel tracking for frequency hopping communication syst

1985-07-24

1987-07-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

342149, 455273, H04L 2730, G01S 1352

Patent

active

046792074

ABSTRACT:
A single channel antenna tracking system for frequency-hopping communication systems. The tracking system utilizes the synchronization pulses accompanying the frequency-hopping data bursts. The receive antenna system includes an antenna feed network for providing sum and difference antenna receive signals. The tracking system comprises a tracking switch circuit which normally switches the antenna system sum signal to the receiver during reception of a frequency-hopping data burst. During the reception of an agile synchronization pulse, however, the switching system is adapted to timeshare between the antenna sum signal and the difference signal or signals. During the synchronization pulse duration, the receiver thus receives a single waveform which during one portion of the sync pulse represents the sum signal and during one or two other portions represents the difference signals. The respective sum and difference signals may then be processed to determine the antenna tracking error. Only one channel is required for both the sum and difference signals, thereby minimizing the cost of the tracking system.

REFERENCES:
patent: 3772695 (1973-11-01), Hoffman
patent: 3921171 (1975-11-01), Strother, Jr. et al.
patent: 4346382 (1982-08-01), Bosc et al.
patent: 4387373 (1983-06-01), Lonquemare, Jr.
patent: 4449127 (1984-05-01), Sanchez
patent: 4527161 (1985-07-01), Wehner

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