Procedure for extracting motion errors of a carrier carrying a coherent imaging radar system from raw radar data and setting up the process

摘要

To image areas with different back scattering ratios, successive azimuth spectra are continuously formed over a particular period in this method; the frequency offset of the proportion of back scattering ratio is obtained by determining the position of the maximum of the correlation in each case between two azimuth spectra formed immediately following one another in time. A speed Vv(t) in the forward direction is then separated by filtering operations from an acceleration vb(t) in the direction of view of the antenna, the acceleration Vb obtained also being subjected to a normalisation after double integration which then provides the error, that is to say the deviation in the direction of view of the antenna. …??In distinction from GPS systems, all necessary information items are taken from the raw radar data and no ground station is needed either so that the present method is much more flexible and can be used much more autonomously. Furthermore, the present method, in comparison with the autofocus method, has a much higher band width and can be carried out in real time which cannot be achieved in the autofocus method. …IMAGE…