Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-01-26
1985-01-22
Gruber, Felix D.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
364449, 364460, 343 5R, G01S 902
Patent
active
044955006
ABSTRACT:
A system for gathering topographic data for use in computer generation of topographic maps of various forms. This system includes equipment mounted in an aircraft which can be flown over a terrain area which is to be surveyed. The equipment comprises a low frequency radar which is capable of penetrating foliage in the survey area for generating a signal representative of the distance from the aircraft to the terrain surface, a precision altimeter that produces a signal representative of the altitude of the aircraft with respect to a reference plane such as sea level, temperature and humidity sensors for producing signals representative of those quantities, a clock for producing a signal representative of a standard time, and a digital recorder for recording the previously named signals which are produced during over flight of a survey area. The recorder has a recording medium which can be removed from the aircraft and employed at a remote time and place as computer input for effecting generation of topographic maps showing various characteristics of the survey area. Concurrent with the gathering of data in the aircraft, data representative of temperature and humidity at the surface of the survey area are gathered and recorded on a second recording medium. The two recording media can be combined at a remote time and place as computer input to produce highly accurate topographic maps.
The system can include a second radar operating at a different frequency from that at which the first mentioned radar operates. One of the radars can accurately penetrate the foliage and the other can measure the distance from the aircraft to the foliage surface so that information concerning the foliage can be generated. The system also includes circuitry for responding to surface water in the survey area so that accurate mapping of rivers, lakes, streams and swamps can be achieved.
REFERENCES:
patent: 3614778 (1971-10-01), Graham et al.
patent: 4050067 (1977-09-01), Elmore, Jr.
patent: 4144571 (1979-03-01), Webber
patent: 4224669 (1980-09-01), Brame
patent: 4359732 (1982-11-01), Martin
Faubion Urban H.
Gruber Felix D.
Huang Karl
Olson Thomas H.
SRI - International
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