星间链路通信收发一体化系统设计
Design of Transceiver Integrated System for Inter-satellite Link Communication
鲍爱达 1候世豪 1郭鑫 1崔鹤 2张鑫哲1
作者信息
- 1. 中北大学动态测试技术国家重点实验室,太原 030051
- 2. 航天恒星科技有限公司,北京 100095
- 折叠
摘要
随着卫星制造发射成本的降低以及全球通信需求的增加,低轨星间链路技术成为研究热点;星间链路可将多颗卫星互联,建立具有导航和通信功能的自主运行系统,可靠的通信技术是当前的研究重点;为了适应外太空具有较大多普勒频移的高动态环境,设计了星间链路通信收发一体化系统;发射端采用UQPSK直接序列扩频技术,双通道架构可同时完成不同速率的导航与通信数据的发射,再运用LIDPC编码技术提升数据发射速率与稳定性;接收端采用改进的PMF-FFT分段捕获算法与归一化最小和LDPC译码算法,以快速准确捕获星间信息;在FPGA硬件平台经过多次测试,该系统均可在高动态环境下,正确快速捕获到多普勒频移高达±341 kHz的信号,捕获算法时间均可保持在200 ms以内,符合实际应用中的性能需求.
Abstract
With the reduction of satellite manufacturing and launch costs and the increase in global communication needs,the low-orbit inter-satellite link technology has become a research hotspot.Inter-satellite link can interconnect multiple satellites to establish an autonomous operating system with navigation and communication functions,the reliable communication technology is currently a research focus.In order to meet the requirements of high dynamic environments with large Doppler frequency shift in outer space,an integrated inter-satellite link communication transceiver system is designed.The transmitter uses unbalanced quadrature phase shift keying(UQPSK)direct sequence spread spectrum technology,the dual-channel architecture can simultaneously complete the trans-mission of navigation and communication data at different rates,and then applies the low density parity check code(LDPC)encoding technology to improve the data transmission rate and stability;The receiving end uses an improved partial match filter-fast fourier transform(PMF-FFT)segmented acquisition algorithm and normalized minimum and LDPC decoding algorithm to quickly and accu-rately capture the inter-satellite information.After many tests on the FPGA hardware platform,the system can accurately and quickly capture signals with Doppler frequency shift up to±341 kHz in highly dynamic environments.The capture time of the algorithm can be kept within 200 ms,which meets the performance requirements in practical applications.
关键词
星间链路/UQPSK直接序列扩频技术/PMF-FFT/LDPC/FPGAKey words
inter-satellite link/unbalanced quadrature phase shift keying and direct sequence spread spectrum(UQPSK-DSSS)/PMF-FFT/LDPC/FPGA引用本文复制引用
基金项目
国家自然科学基金资助项目(62204232)
山西省基础研究计划资助项目(202103021244198)
出版年
2024
NETL
NSTL
万方数据