RECOMMENDATION ITU-R SA.1347 … FEASIBILITY OF SHARING BETWEEN RADIONAVIGATION-SATELLITE SERVICE RECEIVERS AND THE EARTH ... ANNEX … Potential interference from spaceborne active sensors into radionavigation-satellite service receivers in the 1 1 Introduction 2 Technical characteristics of a spaceborne SAR 3 Characteristics and protection criteria of GPS and GLONASS-M systems 4 Compatibility analyses 4.1 Compatibility analysis with consideration of SNR degradation 4.2 Compatibility analysis with consideration to GPS receiver tracking loop gain 5 GPS/SAR compatibility demonstration 6 Summary