Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-06-29
1982-03-16
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5DP, 343 171PF, 356 5, 367 95, G01S 1312
Patent
active
043203973
ABSTRACT:
An echo tracker/range finder or altimeter in which the pulse repetition frequency (PFR) of a predetermined plurality of transmitted pulses is adjusted so that echo pulses received from a reflecting object are positioned between transmitted pulses and divide their interpulse time interval into two time intervals having a predetermined ratio with respect to each other. The thus-adjusted PRF is related to the range of the reflecting object. More specifically, the invention provides a means whereby the arrival time of a plurality of echo pulses is defined as the time at which a composite echo pulse formed of a sum of the individual echo pulses has the highest amplitude. This arrival time is determined by dividing an interpulse time interval between adjacent transmitted pulses into a predetermined plurality of corresponding time increments. The sum of a plurality of echo pulse portions occurring within each corresponding time increment defines the composite echo pulses, the time increment containing the highest sum defining the arrival time for the plurality of echo pulses. Having determined the arrival time with respect to the interpulse time period, the transmitted PRF is automatically adjusted so that the arrival time divides the interpulse time interval in accordance with a predetermined ratio, this PRF then being related to the range or altitude of the reflecting object. The invention is applicable to radar systems, sonar systems, or any other kind of system in which pulses are transmitted and echoes received therefrom.
REFERENCES:
patent: 2542983 (1951-02-01), Beatty
patent: 2568926 (1951-09-01), Moran, Jr.
patent: 2981942 (1961-04-01), Gross
patent: 3334344 (1967-08-01), Colby, Jr.
patent: 3660845 (1972-05-01), Pettersson
patent: 3739379 (1973-06-01), Davis
patent: 4074223 (1978-02-01), Eggleton et al.
Constantinides Nick J.
Frosch Robert A. Administrator of the National Aeronautics and Space
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