IONOSPHERIC SOUNDING
Assignee
SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND THE, A BRITISH CORP.
Filed
Oct 29, 1985
Granted
Jul 20, 1993
Location
PORTSMOUTH EN GB
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.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Nov 28, 1988
Rescinded
Jul 10, 1992
Duration
3 years, 7 months
Inventor
- 1ROBERT G. WILKINSON
Record Details
- Patent number
- US 5230076
- Application
- 06807972
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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