Protection Criteria for Digital Radio-relay Systems to Ensure Compatibility with Radar Systems in the Radiodetermination Service

considering a) that radar systems can produce interference to digital radio-relay systems (DRRS), which gives rise to regular bursts of errors related to the operational characteristics of the radar e.g. the radar antenna rotation rate; b) that the importance of radar systems is recognized worldwide, but that nevertheless efforts should be made to reduce the levels of spurious emissions from such systems; c) the importance of DRRS in telecommunication networks; d) that it is necessary to establish the criteria for ensuring compatibility between radar systems and DRRS; e) that the effects of interference from radar systems are different depending on the type of radar systems; f) that although the effect of radar interference on DRRS is different depending on the modulation methods employed in the interfered-with systems, provisionally it seems appropriate to define the protection threshold in terms of interference-to-thermal noise ratio in order to make the criteria applicable to any modulation method,