초록 ▼

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 t

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.

대표청구항 ▼

A sensor system comprising: a plurality of sensor stations of the same type for surveillance of an area intended to include an object to be protected, said sensor stations being spaced apart essentially along the periphery of a circle, each for surveillance of a segment of the periphery of said circ

A sensor system comprising: a plurality of sensor stations of the same type for surveillance of an area intended to include an object to be protected, said sensor stations being spaced apart essentially along the periphery of a circle, each for surveillance of a segment of the periphery of said circle, in the central part of which an object to be protected is intended to be contained, each sensor station including: a detector unit which is arranged to scan an arc in an azimuth sector of said 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 said detector unit; measuring means for measuring the time of the passage of a target between the two detection fields; and means for calculating the target position 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.