Microwave system

Details Microwave system Microwave system

1981-04-06

1984-11-27

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343402, 343408, 343418, G01S 144

Patent

active

044853840

ABSTRACT:
The new invention is a description of a double sideband commutated Doppler microwave system for landing aircraft or spacecraft. It is capable of providing angular information in elevation and azimuth by the measurement of a Doppler frequency in an airborne receiver at a distant point. Furthermore the system has the ability to detect and correct residual multipath errors present in the Doppler signal. It achieves this by the use of an additional beacon signal of known design frequency.
The new system is an air-derived navigation system and the main features of its design include the use of two reference radiators, a single moving source along a baseline of radiators, a Doppler signal for deriving angular information, some useful bandwidth economy, a beacon signal for precise multipath error detection and correction and a large time-bandwidth product for averaging errors.

REFERENCES:
patent: 3626419 (1971-12-01), Earp
patent: 3670337 (1972-06-01), Earp et al.
patent: 3885241 (1975-05-01), Overbury
patent: 4106023 (1978-08-01), Baghdady

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