Ionospheric sounding

Details Ionospheric sounding Ionospheric sounding

1985-10-29

1993-07-20

Gregory, Bernarr E.

Telecommunications

Transmitter and receiver at separate stations

Optimum frequency selection

455 63, 455 671, 4552261, 4552262, 4552263, 375 1, H04B 1700

Patent

active

052300765

ABSTRACT:
An ionospheric sounding system for frequency management of a HF communications system operates between a transmitter and a remote receiver and makes use of code-modulated narrow band sounding pulses transmitted at frequencies throughout the HF band. The code has an impulsive auto-correlation function and the frequency selection is pseudo-random. The code may be a two-part complementary code. Alternatively the code may be a selected one of a family of codes possessing high auto-correlation and low cross-correlation properties, thereby enabling communications management information to be conveyed by the choice of code. Measurements of signal and noise are made at the receiver for each transmitted frequency to assist establishing a HF communications link. Synchronous detection of the received signal is used, employing correlators (103, 104) in phase quadrature.

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