Polarimetric Bias Assessment for the Application of Target Null Theory

In polarimetric synthetic aperture radar (PolSAR) images, strong scattering centers on man-made targets contaminate their adjacent weak scattering points. We can use the target null theory to mitigate this effect, so that we can acquire the adequate scattering mechanism of these weak points. Since the efficiency of the theory depends on the system biases of the transmitting/receiving polarimetric channels, we analyze the relationship between suppression efficiency and the system bias requirement when the PolSAR system works in two modes: the alternate transmit and simultaneous receive (ATSR) mode and the simultaneous transmit and simultaneous receive (STSR) mode. The theoretical model proposed in this letter is verified by electromagnetic simulations and GF-3 data.