Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-11-17
1978-12-26
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343100ME, G01S 1100
Patent
active
041318919
ABSTRACT:
A passive microwave velocity sensor uses the natural radiation from the terrain to determine ground velocity independent of altitude. The sensor employs two radiometric interferometers, which analyze inputs from two pairs of receiving antennas aligned along the direction in which velocity is to be sensed. Each pair of receiving antennas has a combined radiation pattern that generates a series of interference fringes along the terrain. Circuitry in each interferometer detects the variation in amplitude of terrain radiation as the antennas pass over the terrain. The frequency of the detected signal is directly proportional to ground velocity divided by altitude. The phase delay in the signals is inversely proportional to altitude. Dividing the frequency by the phase delay yields a signal directly proportional to ground velocity and independent of altitude. By using two triads of receiving antennas and switching between different pairs of antennas in the triads, two radiometric interferometers can be used to generate signals representing along-heading velocity and drift velocity.
REFERENCES:
patent: 3155974 (1964-11-01), Seling
patent: 3838424 (1974-09-01), Goldfischer
patent: 3974500 (1976-08-01), Goldfischer
Berger Richard E.
Kennedy Thomas W.
The Singer Company
Wilbur Maynard R.
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