Design Of High-Efficiency Real-time Imaging Processing For Missile-borne SAR Imaging Guidance

Synthetic Aperture Radar(SAR)is an active microwave imaging system with characteristics of all-day,all-weather,two-dimensional high resolution,etc.It is widely utilized in both military and civilian fields.As a new application of missile-borne SAR,the compound guidance method has become an important research direction of radar imaging.In this paper,a missile-borne SAR sub-aperture imaging algorithm based on frequency-domain phase filtering processing of multiple motion error compensation methods is studied.The algorithm is implemented at dual DSPs framework and SYS/BIOS architecture,while a real-time imaging software is discussed in detail.Considering the characteristics of high-squint imaging of missile-borne SAR,the sub-aperture imaging algorithm based on frequency-domain phase filter processing,a variety of motion error compensation methods and geometric correction methods are analyzed.Unlike traditional non-system application development,this paper uses an application development approach based on the SYS/BIOS real-time system framework and studies synchronization and communication between threads,cores and DSPs.In order to meet real-time requirement of missile-borne SAR,the mapping of the algorithm between dual DSPs is studied in detail.A boot method based on heterogeneous platforms is proposed to reduce the complexity of DSP boot loader.Subsequently,this paper designs a ground-based simulation system based on the Ethernet due to difficulties in real-time system debugging.Finally,this paper analyzes real-time performance of missile-borne SAR guidance software based on the results of a large number of field experiments.