Radar interference suppression circuit for sea traffic control - uses background threshold signal enabling automatic processing and workload reduction

摘要

The circuit for the reduction of interference in radar installations used for sea traffic control has time and interference dependent amplification control of the receiver and scan-hold circuits. The circuit automatically detects useful target echoes, works over a large dynamic range, and reduces sea and weather clutter to a low constant level. A threshold voltage for the video signal is derived from a delayed, summed background video input signal in a test channel and compared with a delayed video input signal. The device eliminates receiver sensitivity adjustment by radar observers, and permits economical automatic radar data processing. The test channel contains a multiple analogue delay element and a summer amplifier which feeds a scan-hold circuit further summer amplifier which feeds a scan-hold circuit connected to the test channel amplifier.