Measurement of On-board Azimuth Antenna Patterns for EOS-04 SAR Payload

Azimuth pattern measurement of SAR antenna is important as it gives azimuth beam-width and side lobe levels. These parameters, in turn, determine azimuth resolution and azimuth ambiguity of the final SAR image. Measured azimuth pattern helps payload designer to analyze the on-board antenna performance and introduce phase corrections, when required. In this paper, we present a ground receiver methodology to measure the On-board Azimuth Antenna Pattern of EOS-04 using a calibrated ground receiver (developed in-house) called as ‘Azimuth Pattern Measurement System’ (APMS).