A SAR RADAR SYSTEM AND A METHOD RELATING THERETO

摘要

The present invention relates to a radar system comprising a platform (10) movable along a path in relation to a ground surface portion (20) and carrying a positioning device, a timing device and a radar equipment (1). It is adapted to implement SAR for imaging the ground portion. It includes recording means for collecting radar raw data comprising radar echo amplitudes annotated with distance and the moment of time of collection and being intertwined with platform position measurement data annotated with the respective moment of time of collection thereof. It also comprises processing means (3,4) for SAR processing using the collected radar raw data and position measurement data, and being adapted to calculate, by iteration, a sequence of summations of length k of radar amplitudes, annotated with distance and angular parameters, defined with respect to a common origin in 3-dimensional space defined at a location along a vector formed by the vector sum PQPI + PiP2 +... + P^iPfc of k connected 3-dimensional vectors PQPJ, -PjP2V -5 Pk-I-Pk . Each vector (subaperture) contains a respective origin of each radar amplitude term in the summation, and the processing means are adapted to initiate the iteration process in a first iteration stage by regarding radar raw data as the radar amplitudes, where these radar data have their origins along vectors starting and ending in 3-dimensional points given by the positioning measurements.