REP SFCG 32-2R1 (Sharing between RNSS & EESS in 1215-1300 ...

TABLE OF CONTENTS
1. Introduction .......................................................................................................................... 3
2. Measurement of Degradation Ratio of GPS Receiver from Scatterometer2 and SAR3
Systems ........................................................................................................................... 3
2.1. Compatibility Measurement Approach ................................................................... 3
2.2. Synthetic Aperture radar (SAR3) and Scatterometer2 signals ................................ 3
2.3. SAR and Scatterometer Signal Calibration ............................................................. 8
2.4. RNSS receiver characteristics and performance criteria ......................................... 9
2.5. Measurement procedure .......................................................................................... 9
2.6. Measurement results ................................................................................................ 9
2.6.1 Receiver Selectivity and Antenna Filter ............................................. 9
2.6.2 C/N 0 or SNR Degradation Equation .................................................. 13
2.6.3 Measured SNR or C/N 0 Degradation versus Effective Duty Cycle .... 13
2.7. Possible Mitigation Measures.................................................................................. 15
2.7.1 Reduction of the Ratio of Chirp Bandwidth Overlapping the Pre-
Correlator Band .................................................................................... 15
2.7.2 Reduction of the Ratio of Observation Time per Cycle ............................ 15
2.8. Conclusions related to the GPS receiver protection ................................................ 16
3 Measurement of Degradation Ratio of QZSS Receivers from ALOS-2 SAR System ......... 20
4 Conclusion ............................................................................................................................ 21
3-July-2013 Page 2 of 21 REP SFCG 32-2R1