Communications: directive radio wave systems and devices (e.g. – Combined with diverse type radiant energy system – With television
Patent
1994-09-22
1996-11-26
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Combined with diverse type radiant energy system
With television
342 56, 342 59, 342 53, G01S 1358, G01S 1372, G01S 1386
Patent
active
055790097
ABSTRACT:
A sensor system comprises a plurality of sensor stations of the same type for surveillance of an area intended to include an object to be protected, the sensor stations being distributed essentially along the periphery of a circle, in the central part of which an object to be protected is intended to be contained. Each sensor station includes a detector unit which is arranged to scan an arc in an azimuth sector of the circle allocated to it up towards the background of the sky in each of two detection fields formed along the arc having different elevation angles with respect to the detector unit. The time of the passage of a target between the two detection fields is measured, and the target position is calculated relative to the sensor station on the basis of the measured time, the speed of the target, the angle between the detection fields and the angle to the target.
REFERENCES:
patent: 5365236 (1994-11-01), Fagarasan et al.
Nilsson Bjorn
Nilsson-Almqvist Bo
Bofors AB
Sotomayor John B.
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