Spotlight Mode Imaging Of Large Front-squint In Drop Section On High Speed Platform And Software Engineering On Multi-core DSP

In recent years the precision-guided weapons such as the missiles become the main development direction of military weapons the missile can realize attacking target accurately through the scene matching guidance. Optical imaging and SAR imaging can be used for matching guidance, the characteristics of full-time and full-weather of SAR imaging enable the guided weapons to adapt the changes of environment, so the missile-bore SAR imaging has been widely applied.In the need of attacking the target, the missiles do some movement during the flight and it has high speed and acceleration, its trajectory is curve. The general SAR imaging algorithm of uniform rectilinear movement applied to the airborne and space-borne is not fit for the missile-bore. This paper puts forward the missile platform geometric model of decline period based on the PFA algorithm of airborne imaging,then the improved PFA algorithm applied to the missile-bore is introduced, it can get the focusing image on missile after correcting the first phase term, the second phase term introduced by the acceleration and the wave front after Dechirp.Generally the steps of airborne imaging algorithm are simple and less computational, and its realization can satisfy the requirement of real-time. Compared with the airborne imaging algorithm, the steps of missile-bore imaging algorithm are complex and more computational and it's hard to realize. TI's high-performance multi-core TMS320C6678 provides the method to realize the missile-bore imaging algorithm. This paper make full use of multi-core performance of the DSP and realize the algorithm on eight nuclear after putting forward the improved PFA algorithm. It realizes synchronization using the share variables. The number zero nuclear is the main kernel, it controls the other seven nuclear to complete the computing tasks coordinately. Then this paper puts forwards the concrete implementation method, tests out the corresponding operation time for each algorithm module and gets the larger computing module. To reduce the time, it advises to realize the water source from the underlying and prove the reasonable using of the resource.