Frequency management system

Details Frequency management system Frequency management system

1985-07-15

1988-10-25

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

455 62, 455 67, H04B 900

Patent

active

047808853

ABSTRACT:
A high frequency (HF) frequency-management system for automatically selecting optimum HF frequency. A frequency management means controls the operation of a regular HF radio communications transmitter and receiver at each station. The frequency-management means transmits sounding signals synchronously and repeatedly over a finite group of HF frequencies, from a first radio communications station to a second radio communications station. Link quality evaluation (LQE) is carried out at the second station. Sounding signals are transmitted synchronously and repeatedly back to the first station. Optimum HF frequencies are selected based on the sounding signals and LQE. An HF communications path is automatically established between stations. The system performs the scanning of the HF frequencies, the detection and measurement of signals, noise and interferences on each frequency and the timing synchronization as required for the frequency management operation.

REFERENCES:
patent: 3475685 (1969-10-01), Covil
patent: 3487312 (1969-12-01), Egan et al.
patent: 3532988 (1970-10-01), Magnuski
patent: 4140973 (1979-02-01), Stevens
"Characterization of Randomly Time-Variant Linear Channels", by P. A. Bello, IEEE Trans Com Systems, CS-11, Dec. 1963.
"Performance Monitor Techniques for Digital Receivers Based on Extrapolation Techniques", by D. J. Gooding, IEEE Trans Com, Com-16, Jun. 1986.

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