Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-02-05
1980-11-18
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 1334
Patent
active
042348820
ABSTRACT:
To measure the contents of a bunker or silo a transmitter mounted over the bunker beams down on to the contents surface a very high frequency signal that is caused repeatedly to rise and fall in frequency with either a constant sweep time and a progressively varying amplitude of frequency change or a constant amplitude and a progressively varying sweep time. The reflected target return signals are mixed with the transmitted signal to obtain a beat frequency which is filtered and processed to derive a signal representative of the range of the target, i.e. the contents surface, below the transmitter. To discriminate against target returns from fixed parts of the bunker structure, such as support members, a control unit is provided with a memory store into which are preloaded signals representative of fixed structure returns. The target returns received when the apparatus is in operation are then compared with the stored signals and any that are the same as stored signals are rejected. The control unit may also include a processor capable of distinguishing between returns from fixed targets and returns from a target moving toward or away from the transmitter.
REFERENCES:
patent: 3727897 (1973-04-01), Bennett
patent: 3730628 (1973-05-01), Wolcott et al.
patent: 4044353 (1977-08-01), Levy
patent: 4044354 (1977-08-01), Bosher et al.
patent: 4044355 (1977-08-01), Edvardsson
Hawker Siddeley Dynamics Engr., Inc.
Hubler Malcolm F.
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