The sampling error calibration and imaging of synthetic aperture digital radiometer

The synthetic aperture digital radiometer (SADR) is a new type of passive remote sensing instrument that can reach high spatial resolution. The phase coherence is essential to image of SADR. The sampling error of digital radiometer will affect the correlation, result in imaging sensitivity degraded. This paper analyzes the effect on image sensitivity of SADR by sampling error of multi-channel digital radiometer. The adapted sampling error calibration method is proposed to reduce sampling error and improve the imaging sensitivity. The result of simulation measurement and bright temperature by experiment shows that sampling error calibration can inprove the imaging quality of SADR.