Doppler reference antenna with phased centerline emphasis

Details Doppler reference antenna with phased centerline emphasis Doppler reference antenna with phased centerline emphasis

1976-10-04

1978-08-01

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343108M, G01S 140

Patent

active

041046366

ABSTRACT:
In a doppler radionavigation system wherein a transmitted signal has opposite frequency coding during alternating time intervals, a reference antenna is provided which has different radiation modes during the alternating time intervals. In a preferred embodiment, the two reference antenna modes have substantially the same amplitude radiation pattern, but different phase radiation characteristics. The phase between the radiation in a selected direction and the radiation in the remaining directions is different for the two antenna modes. This phase change substantially reduces the position determination error resulting from multipath signals.

REFERENCES:
patent: 3208067 (1965-09-01), Alford
patent: 3308468 (1967-03-01), Hannan
patent: 3864679 (1975-02-01), Hannan et al.
patent: 3864680 (1975-02-01), Hannan

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