| 摘要 |
<p>An adaptive proximity indication system using the signals emitted by the hundreds of existing secondary radar ground stations and the nearly 100,000 cooperating transponders on mobile vehicles to detect intrusion in a monitored proximity volume. The system automatically adapts to a given SSR environment to vary the size and shape of the monitored volume and to control its method of proximity measurements. There is provided first and second receivers for receiving interrogation and reply signals respectively, interrogation rate measuring for determining the interrogations per unit of time and a mode of operation modifying device responsive to measurement rate.</p> |
