| 摘要 |
of the invention The invention relates to a sensor system with a number of sensor stations for surveillance of an area intended to include an object to be protected. The sensor stations (1-4) are essentially distributed along the periphery of a circle (5). Each sensor station comprises a detector unit (11) arranged to scan the arc in an azimuth sector allocated to it in two detection fields (9,10). The time of passage T of a target which passes the two detection fields is measured and the target position is calculated on the basis of the measured time T, the target speed Vmissile, the angle between the detection fields .alpha. and the angle to the target .beta.. In the sensor system, the scanning is carried out from below and up towards the background of the sky. This implies that the scanning is not interfered with by the surrounding terrain and that a large IR area is obtained. The sensor system according to the invention increases the possibilities of detecting low-flying missiles and similar targets in comparison with conventional technology
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