基于LabVIEW的皮卫星接收地面站解调器设计

Design of Demodulator for Ground Station of Pica-satellite Based on LabVIEW

针对皮卫星接收地面站测试系统解调器的应用场合,研究和开发了一种基于LabVIEW虚拟仪器开发平台的软件解调器,提出了一种简化的遥测信号解调算法。利用LabVIEW控制数据的采集和存储,通过VisualC++实现了解调算法,并在LabVIEW中调用该程序来实现地面站遥测信号的解调。给出了解调算法的原理、Costas环跟踪方差的MATLAB仿真和软件设计,通过误码率实验,测试结果证明了该设计的有效性。本解调系统具有应用灵活和便于改进的优点,已应用于皮卫星的测试实验。

Aiming at the ground station test system of pica-satellite telemetry signal, a software demodulator based on virtual instrumental platform namely LabVIEW is studied and developed in this paper. A simplified telemetry signal demodulation algorithm is proposed. The telemetry signal demodulation of the ground station is realized through the Visual C＋＋ codes embedded in LabVIEW platform, with the data acquired and stored by using LabVIEW. The principle and MATLAB simulation of tracking variance of Costas loop and software design of the demodulator are presented. The test results of bit error rate （BER） show that the design is feasible. Besides, the designed system has the advantages of flexibility and reconfigurability, so it has been used largely in the test of pica-satellite.