Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-05-22
1976-11-02
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 942
Patent
active
039900762
ABSTRACT:
An amplitude monopulse radar, in which quadrature sum and difference signals are processed in order to determine the magnitude and direction of antenna tracking angle error, utilizes coherent detection which clutter reference for moving target indication (MTI) operation. In the absence of clutter, point targets (both fixed and moving) are detected on a per-pulse coherent basis (as between the sum and difference, in phase and quadrature signal channels) using as a reference either signal channel noise or an oscillator nominally at the IF frequency. Both modes of operation are accommodated by using bandpass doppler filters which are convertible to low pass filters in order to permit zero-doppler signals relating to point targets to pass in the absence of clutter, the filter mode being selected by a point target discriminator which senses the presence of clutter in range bins straddling the signal range bin. The dual mode filter may consist of a high frequency, low pass filter and a low frequency, low pass filter, the presence of clutter causing the low frequency characteristic to be subtracted from the high frequency characteristic so as to form a bandpass filter.
REFERENCES:
patent: 2997707 (1961-08-01), Parker
patent: 3267468 (1966-08-01), Stull, Jr.
patent: 3341847 (1967-09-01), Fried et al.
patent: 3465336 (1969-09-01), Fishbein et al.
patent: 3576564 (1971-04-01), Galvin
patent: 3594800 (1971-07-01), Stoney
Hubler Malcolm F.
United Technologies Corporation
Williams M. P.
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