Methods for ascertaining radar interference into high capacity radio relay receivers

The operational surveillance of radio relay equipment carrying normal traffic has become common within many administrations. The parity check feature of the radio frame is exploited to derive an estimate of the bit error rate (BER) and subsequently the number of events (seconds) when a certain BER is exceeded is cumulated. Thus one may estimate whether the performance of a particular transceiver/radio hop will meet the requirements of CCIR Rec. G.821. The function described is performed by the supervisory system for all radio channels and all hops of a particular transmission system. Some methods for ascertaining the occurrence of radar EMI, and for extracting some of the characteristic features of an interfering radar are presented