基于混合平台的深空通信遥测接收机架构设计

Structure of a Deep Space Telemetry Receiver Based on Hybrid Computing Platform

针对目前深空通信遥测信号接收机硬件实现存在的重配置及扩展灵活性较差的问题,提出了一种符合CCSDS(空间数据系统咨询委员会)标准基于混合平台的接收机架构设计。本设计充分利用了GPU(图形处理器)平台片上存储资源的低访问延迟特性、流多处理器的高速并行处理特性以及CUDA(统一计算架构)软件开发的配置灵活性,对接收过程中的帧同步和信道译码进行了高速实现。同时采用FPGA(现场可编程门阵列)对接收数据进行解调处理,通过CPU(中央处理器)对接收机内部数据流传输进行控制,实现了可重配置的混合平台接收机架构。实验结果表明本接收机架构在采用CCSDS标准的LDPC(低密度奇偶校验)编码时能够灵活切换多种码长码率模式,译码后数据吞吐率能够达到10 Mbit/s以上。

This paper proposes a CCSDS(Consultative Committee for Space Data Systems)-conforming structural design of deep space telemetry receiver based on hybrid computing platform to improve the reconfigurability and expandability of current receivers.The design makes full use of features including low access latency of GPU(Graphic Processing Unit) on-chip memory,parallel processing characteristics of streaming multi-processors in GPU and flexible development under CUD A(Compute Unified Device Architecture) programming architecture,and achieves high-speed frame synchronization and channel decoding.FPGA(Field Programmable Gate Array) is also contained in the hybrid computing platform for demodulation processing and CPU(Central Processing Unit) is used for control of data streaming.Experimental results show that the proposed design provides a feasible and effective way to reconfigure among multiple code lengths and code rates of CCSDS-conforming LDPC(Low Density Parity Check)codes.Throughput of the receiver is at least lOMbit/s follwoing decoding.