太极计划星间激光通信参数设计及实验验证
Parameter Design and Experimental Verification of Taiji Program Inter-Satellite Laser Communication
查看参考文献23篇
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文摘
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在太极计划中,三颗卫星将构成边长为300万km的三角形星座。为完成卫星间的信息交互,需要在星间干涉链路中加入激光通信。笔者从太极计划星间通信的需求出发,基于目前的相位计系统,提出了太极计划星间激光通信方案及系统参数的设计。为验证所设计参数的合理性以及通信系统的性能,基于自研板卡,搭建了电子学模拟系统及光学验证系统。在发送端将通信码与伪随机码以直接序列扩频的方式调制至激光相位,通过激光链路将信息发送至接收端,并采用锁相环及延迟环对其进行解析,完成通信功能。测试结果表明,所设计的通信系统参数较为合理,能够与相位计系统有效融合,在通信速率为19.5 kb/s的条件下,通信系统的误码率优于10-6,可为太极计划的相关参数设计提供参考。 |
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其他语种文摘
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Objective The Taiji program consists of three satellites that form an equilateral triangle with a side length of 3 million kilometer. The main scientific goal is to detect gravitational wave sources, such as the merger of medium-mass black holes and the rotation of medium-mass black hole binaries. The Taiji program uses laser interferometry to measure small shifts between stars caused by gravitational waves. Limited by satellite loads, laser interferometry systems must be highly integrated with the measurement systems. First, the laser communication link transmits data from the two satellites to the main spacecraft. After preprocessing is completed, the scientific data are transmitted to the ground station. The main requirement of the Taiji program laser communication is real-time communication, with a bit error rate of less than 10-6 and a rate of more than 15 kb/s. To meet the needs of the Taiji program inter-satellite laser communication, a communication scheme and system parameter design based on a phase meter system are proposed in this paper. An experimental verification system is planned to be set up under laboratory conditions to verify the rationality of the designed parameters and implementation of the scheme. Methods The validity of the proposed method was verified under laboratory conditions by setting up a ground electronic simulation system. To more closely simulate the actual transmission process of inter-satellite laser communication links, a ground optical verification system was built in this study. To fully simulate the actual situation of inter-satellite laser communication, the ground optical verification system was divided into three parts: spread-spectrum modulation, link transmission, and phase demodulation. Modulation and demodulation were completed on K7-FPGA(field programmable gate array, FPGA). Link transmission was performed using a laser with a wavelength of 1064 nm. In this experiment, the communication codes and the pseudo-random noise(PRN) code were modulated to the laser phase using a direct sequence spread spectrum at the transmitting end. This information was sent to the receiving end through a laser link. At the receiving end, a phase-locked loop(PLL) was used for carrier synchronization, and a delay-locked loop(DLL) for code synchronization, completing the communication function. Results and Discussions The demodulation performance is evaluated in this study by measuring the error rate of the mixed code parsing. The mixed codes are transmitted in three experiments, and the correct and incorrect numbers are counted. The test results indicate that the average error probabilities of the electronic and optical systems are 0.20% and 1.3%, respectively. This is mainly because the filter has a wide transition band. If the sampling decision is made in the transition zone, phase ambiguity can easily occur. This phenomenon leads to sampling decision errors that affect the demodulation performance. In addition, the background noise caused by the components and environment of the system is the main cause of mixed code errors, which are widely found in optical and electronic systems. Noise in an optical system is significantly higher than that in an electronic system. Therefore, the error rate of mixed code analysis in an optical verification system is much higher than that in an electronic system. The communication bit error rate was then measured to evaluate the communication performance of the entire system. The test results show that when 106 codes were transmitted by the electronic simulation and optical verification systems, the number of correct codes received by the three tests is 106. The experimental results show that a ground verification system based on the requirements of the Taiji program inter-satellite laser communication can be effectively integrated with a phase meter system. |
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来源
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中国激光
,2023,50(23):2306002 【核心库】
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DOI
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10.3788/CJL221407
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关键词
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光通信
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太极计划
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系统参数
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光学验证
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直接序列扩频
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地址
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1.
中国科学院国家空间科学中心, 北京, 100190
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国科大杭州高等研究院, 浙江, 杭州, 310024
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中国科学院大学, 北京, 100049
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中国科学院力学研究所, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0258-7025 |
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学科
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电子技术、通信技术 |
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基金
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国家重点研发计划重点专项
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文献收藏号
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CSCD:7637426
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