卫星通信终端通用测试平台高速接口设计

High-speed interface design for universal testbench of satellite communication terminals

摘要:

卫星通信系统向多频段多体制发展的趋势对卫星通信终端测试平台的通用性提出了更高的要求，基于通用处理器的软件无线电(GPP-SDR)技术可用于解决该问题。但目前GPP-SDR处理器和射频前端之间的高速数据传输仍是主要的技术瓶颈。本文针对卫星通信终端通用测试平台需求，提出了基于中断机制的PCI-e高速传输方法和流程设计，并通过移植Xenomai操作系统对高速接口传输的实时性进行优化；设计了一系列的测试实验对所设计接口的实际传输速率和中断丢失概率等指标进行测试。实验结果验证了所提方案具备高速率和低时延的传输特性，能够很好地满足当前卫星通信终端通用测试需求。

Abstract:

Testbench for satellite communication terminals is required to be more universal since satellite communication systems are becoming multi-band and multi-system integrated. General-Purpose-Processor based Software Defined Radio(GPP-SDR) is suitable to solve this problem yet the high-speed data transmission between the processor and RF front-end of GPP-SDR is still one of the main bottlenecks. In this paper, to satisfy the requirements of satellite communication terminals testing, a high-speed transmission method based on interrupt mechanism is proposed. The real-time of the transmission interface is also optimized by utilizing the Xenomai Operating System(OS). A series of experiments are designed to test the actual transmission data rate, interrupt loss probability and other indexes, verifying that the proposed approach has good performance in high speed and low latency and can meet the current requirements on universal testing of satellite communication terminals.