基于FPGA的USB测控系统中PM调制的研究与实现
|
摘要
航天统一S波段(united S-band,USB)测控系统中相位调制(phase modulation,PM)是对遥控信息进行发送端调制的重要单元,针对航天测控PM调制载波频率高、采样速率大的需求,提出了一种基于现场可编程门阵列(field programmable gate array,FPGA)的USB测控系统中PM调制的研究方案及实现方法.设计将测距音信号与副载波信号联合调制到主载波,创新性地采用将高频分量与低频分量分解开、多路并行处理高速数字信号的方式实现相位调制.应用Modelsim仿真验证了设计的可行性,应用频谱仪分析频谱验证了设计的正确性,为地面遥控端提供了测试平台,在高速调制领域具有很强的可移植性.
PM modulation is an important unit to modulate the remote control information at the transmitter in the space USB TT&C(telemetry、track and command) system. Aiming at the requirement of high carrier frequency and high sampling rate of PM modulation in TT&C, this paper presents a research scheme and an implementation method of PM modulation in the USB TT&C system based on FPGA. The design combines the ranging-sound and the subcarrier signal to the main carrier, which realizes the phase modulation innovatively by separating the high frequency component and the low frequency component, and processing the high speed digital signal in parallel. The feasibility of the design is verified by Modelsim simulation, and the correctness is verified by spectrum analysis with spectrometer. The design provides a test platform for the ground remote control, which has strong portability in the field of high speed modulation.
PM modulation is an important unit to modulate the remote control information at the transmitter in the space USB TT&C(telemetry、track and command) system. Aiming at the requirement of high carrier frequency and high sampling rate of PM modulation in TT&C, this paper presents a research scheme and an implementation method of PM modulation in the USB TT&C system based on FPGA. The design combines the ranging-sound and the subcarrier signal to the main carrier, which realizes the phase modulation innovatively by separating the high frequency component and the low frequency component, and processing the high speed digital signal in parallel. The feasibility of the design is verified by Modelsim simulation, and the correctness is verified by spectrum analysis with spectrometer. The design provides a test platform for the ground remote control, which has strong portability in the field of high speed modulation.
引文
[1] 吴慧伦.航天测控信道设备和基带设备综合测试系统设计[J].电讯技术,2014,54(9):1187-1192.DOI:10.3969/j.issn.1001-893x.2014.09.003.
[2] 王鑫,鲁新龙,李强.统一载波测控系统下行信道噪声功率谱密度标定依据分析与探讨[J].计算机测量与控制,2017,25(1):170-172.DOI:10.16526/j.cnki.11-4762/tp.2017.01.048.
[3] 鲍妍.卫星统一载波测控信号副载波调制方式识别[D].哈尔滨:哈尔滨工业大学,2007.
[4] 孙桦,马超.综合基带设备软件设计与实现[J].遥测遥控,2013,34(1):57-60.DOI:10.13435/j.cnki.ttc.002529.
[5] 周玉婷.基于射频一体化芯片的测控应答机模拟地面站关键技术研究[D].北京:中国科学院大学(中国科学院国家空间科学中心),2018.
[6] ALLARD D,HUTCHERSON J.Communications across complex space networks[Z].IEEE Aerospace Conference,Big Sky,MT,USA,2008.
[7] 丁溯泉,于志坚.星上业务综合与地面综合基带一体化设计的思路[J].宇航学报,2003,24(4):359-363.
[8] 李聪.星载高速调制器的数字处理技术研究[D].成都:电子科技大学,2016.
[9] 樊昌信,曹丽娜.通信原理[M].北京:国防工业出版社,2012:104-106.
[10] 张海潮.宽带高分辨率频率合成技术的研究与实现[D].成都:电子科技大学,2014.
[2] 王鑫,鲁新龙,李强.统一载波测控系统下行信道噪声功率谱密度标定依据分析与探讨[J].计算机测量与控制,2017,25(1):170-172.DOI:10.16526/j.cnki.11-4762/tp.2017.01.048.
[3] 鲍妍.卫星统一载波测控信号副载波调制方式识别[D].哈尔滨:哈尔滨工业大学,2007.
[4] 孙桦,马超.综合基带设备软件设计与实现[J].遥测遥控,2013,34(1):57-60.DOI:10.13435/j.cnki.ttc.002529.
[5] 周玉婷.基于射频一体化芯片的测控应答机模拟地面站关键技术研究[D].北京:中国科学院大学(中国科学院国家空间科学中心),2018.
[6] ALLARD D,HUTCHERSON J.Communications across complex space networks[Z].IEEE Aerospace Conference,Big Sky,MT,USA,2008.
[7] 丁溯泉,于志坚.星上业务综合与地面综合基带一体化设计的思路[J].宇航学报,2003,24(4):359-363.
[8] 李聪.星载高速调制器的数字处理技术研究[D].成都:电子科技大学,2016.
[9] 樊昌信,曹丽娜.通信原理[M].北京:国防工业出版社,2012:104-106.
[10] 张海潮.宽带高分辨率频率合成技术的研究与实现[D].成都:电子科技大学,2014.