| The landing sensor is a kind of signal processor which is used for velocity measurement and height measurement and flight attitude control on downward phase.The radar signal processor is not only an important component,but also a hardware platform and software architecture used to implement radar signal processing algorithm.The signal processor needs to meet the requirement of high efficiency,high performance,instantaneity,and low power consumption.Based on the practical project and requirements,this paper develops a design of signal processor,based on FPGA and DSP,and implementation of DSP software,based on TMS320C6455,in landing sensor and achieves the functions,such as the algorithm of measurement and control of different working conditions.Firstly,this paper describes radar signal processing algorithm,including fast Fourier transform,digital down conversion,moving target detection,and Kalman filtering.These principles provide the theoretical basis for the software design and implementation.Secondly,this paper discusses the overall design of signal processor,including the system workflow,hardware platform and software architecture.Two different radar signal systems are researched by analyzing the working principle and composition,also simulated under specific working conditions.Finally,the design and implementation of the DSP software is proposed.The application and debugging is based on the DSP/BIOS system.It also discusses how to optimize the whole software system.The result shows that DSP software system realizes the radar signal processing algorithm and the functions of working conditions control. |
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