Influence of Channel Mismatch on Interferometric SAR Performance and Experiment Validation

Inhalt:
The mismatch between synthetic aperture radar (SAR) central electronic equipment (CEE) is one of the futures of distributed interferometric SAR (InSAR) system compared with the traditional single-satellite double pass interferometric SAR system, which has to be considered in the SAR system design, error index allocation, realization and calibration. A channel amplitude and phase mismatch (APM) model is introduced to analyze its impact on SAR image phase and InSAR interferometric phase. Then we obtain the channel APM influence on interferometric SAR thought an interferometric SAR hardware-in-loop validation experiment using the main and redundancy channel of one CEE payload, a target echo signal simulator (TESS) and other auxiliary equipments. It is showed that the validation experiment results are highly consistent with the results of theoretical analysis, which verifies the influence analysis of channel APM and facilitates the radar equipment design and implementation.