Intra-Pulse Effect Compensation Method for SAR Systems with Up- and Down-Chirp Modulation

The movement of the SAR sensor during the transmit and receive events introduces a space-invariant polychromatic phase, known as intra-pulse (IP) effect. In case the SAR sensor transmits an up/down sequence, the intra-pulse effect shows itself as additional azimuth ambiguities if not properly accounted for. This paper proposes a reconstruction approach to mitigate the IP effect for both single- and multi-channel SAR systems with up- and down-chirp (UDC) modulation. The performance of the approach is demonstrated with point target simulations.