小卫星信号处理单元模拟器设计

Design of signal process unit simulator for small satellite

针对小卫星仿真测试系统中对信号处理单元的模拟需求,设计并开发了一种信号处理单元模拟器,模拟真实卫星信号处理单元的工作过程和时序,在卫星仿真测试系统中代替信号处理单元和飞轮、太阳敏感器等卫星部件。以FPGA为核心,采用VerilogHDL实现与小卫星中心计算机、动力学计算机、调度计算机之间的通讯逻辑设计;采用1个DSP解算4个飞轮模型。目前模拟器已应用于小卫星测试系统中,测试结果表明模拟器工作正常,模型解算正确,满足设计要求。

To fulfill the needs for the simulation of signal process unit in small satellite simulate and test system,a design is provided to achieve a signal process unit simulator.The working process and timing of real signal process unit are simulated.The signal process unit and some satellite devices,such as flywheel and sun sensor,can be replaced by the simulator.The FPGA is adopted to make a center unit,the logic of communication with center computer,dynamics computer and dispatch computer is developed with Verilog HDL.A DSP is used to calculate four flywheel models.The simulator has been applied in the small satellite test system.Practical application and test results show that the simulator works well,the models can be calculated accurately.The design of the simulator meets the technical requirements.