Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-08-13
1982-12-14
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5DP, 343 5CF, G01S 722
Patent
active
043640486
ABSTRACT:
A system, which interfaces with a radar indicator, for improving signal-toise ratio (SNR) and enhancing the detection of moving targets includes an analog-to-digital (A/D) converter, an integrator, a digital memory, a digital-to-analog (D/A) converter, and a synchro-to-digital converter. Radar video is converted to digital signals which are integrated and stored in memory. The angle signal from the antenna pedestal synchro is fed to the synchro-to-digital converter and stored in memory. The contents of the memory is processed, converted to analog form, and fed to the indicator. The radar provides a number M of sweeps within each beamwidth, or angular sector, of the antenna during each antenna scan. Contiguous sets of M sweeps are added to form batches. The signal content for each batch is displayed on the indicator in the angular sector which is identified with the M sweeps. The width of each sector is approximately a beamwidth. Within each sector a number N of batches, which are formed during N successive scans, is displayed on the indicator such that the batch formed during the latest scan appears at the clockwise boundary of a sector and the batch formed during the oldest scan appears at the counterclockwise boundary. The SNR is improved by digitally adding M successive sweeps and displaying the results from N successive scans in a manner whereby signal-plus-noise from one scan is not corrupted by noise from other scans.
REFERENCES:
patent: 3500402 (1970-03-01), Huele et al.
patent: 3569966 (1971-03-01), Dunn et al.
patent: 3789396 (1974-01-01), Taylor, Jr.
patent: 3870992 (1975-03-01), Hanna, Jr.
patent: 3882502 (1975-05-01), Peabody et al.
patent: 4017853 (1977-04-01), Brandao et al.
Linde George J.
Waters William M.
Beers Robert F.
Ellis William T.
Hubler Malcolm F.
Ranucci Vincent J.
The United States of America as represented by the Secretary of
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