高稳定正弦载波产生技术是电容位移传感任务中的关键技术,能否精确实现高精度电容位移传感直接关系到空间引力波探测核心载荷的指标实现。在空间引力波探测任务中,对惯性传感器关键技术--高精度电容位移传感技术中的高稳定正弦载波产生...高稳定正弦载波产生技术是电容位移传感任务中的关键技术,能否精确实现高精度电容位移传感直接关系到空间引力波探测核心载荷的指标实现。在空间引力波探测任务中,对惯性传感器关键技术--高精度电容位移传感技术中的高稳定正弦载波产生电路进行研究,通过将直接数字频率合成(direct digital system,DDS)中影响正弦载波幅值稳定度的因素进行改良,确定了采用基于DDS技术改良的阶梯波滤波法作为正弦载波产生方法,通过模型建立、理论分析对电路展开研究,在不考虑温度影响的前提下,常温下正弦载波的幅值稳定度指标可达到21 ppm/Hz。展开更多
The China Seismo-Electromagnetic Satellite(CSES)deploys three payloads to detect the electromagnetic environment in the ionosphere.The tri-axial fluxgate magnetometers(FGM),as part of the high precision magnetometer(H...The China Seismo-Electromagnetic Satellite(CSES)deploys three payloads to detect the electromagnetic environment in the ionosphere.The tri-axial fluxgate magnetometers(FGM),as part of the high precision magnetometer(HPM),measures the Earth magnetic vector field in a frequency range from direct current(DC)to 15 Hz.The tri-axial search coil magnetometer(SCM)detects the alternating current(AC)related magnetic field in a frequency range from several Hz to 20 k Hz,and the electric field detector(EFD)measures the spatial electric field in a broad frequency band from DC to 3.5 MHz.This work mainly crosscalibrates the consistency of these three payloads in their overlapped detection frequency range and firstly evaluates CSES’s timing system and the sampling time differences between EFD and SCM.A sampling time synchronization method for EFD and SCM waveform data is put forward.The consistency between FGM and SCM in the ultra-low-frequency(ULF)range is validated by using the magnetic torque(MT)signal as a reference.A natural quasiperiodic electromagnetic wave event verifies SCM and EFD’s consistency in extremely low-frequency and very low-frequency(ELF/VLF)bands.This cross-calibration work is helpful to upgrade the data quality of CSES and brings valuable insights to similar electromagnetic detection solutions by low earth orbit satellites.展开更多
文摘高稳定正弦载波产生技术是电容位移传感任务中的关键技术,能否精确实现高精度电容位移传感直接关系到空间引力波探测核心载荷的指标实现。在空间引力波探测任务中,对惯性传感器关键技术--高精度电容位移传感技术中的高稳定正弦载波产生电路进行研究,通过将直接数字频率合成(direct digital system,DDS)中影响正弦载波幅值稳定度的因素进行改良,确定了采用基于DDS技术改良的阶梯波滤波法作为正弦载波产生方法,通过模型建立、理论分析对电路展开研究,在不考虑温度影响的前提下,常温下正弦载波的幅值稳定度指标可达到21 ppm/Hz。
基金supported by the National Natural Science Foundation of China(Grant Nos.41874174 and 41574139)the National Key R&D Program of China(Grant No.2018YFC1503501)+1 种基金the APSCO Earthquake Research Project PhaseⅡand ISSI-BJ projectSouthern Yunnan Observatory for Cross-block Dynamic Process,Yuxi Yunnan,China。
文摘The China Seismo-Electromagnetic Satellite(CSES)deploys three payloads to detect the electromagnetic environment in the ionosphere.The tri-axial fluxgate magnetometers(FGM),as part of the high precision magnetometer(HPM),measures the Earth magnetic vector field in a frequency range from direct current(DC)to 15 Hz.The tri-axial search coil magnetometer(SCM)detects the alternating current(AC)related magnetic field in a frequency range from several Hz to 20 k Hz,and the electric field detector(EFD)measures the spatial electric field in a broad frequency band from DC to 3.5 MHz.This work mainly crosscalibrates the consistency of these three payloads in their overlapped detection frequency range and firstly evaluates CSES’s timing system and the sampling time differences between EFD and SCM.A sampling time synchronization method for EFD and SCM waveform data is put forward.The consistency between FGM and SCM in the ultra-low-frequency(ULF)range is validated by using the magnetic torque(MT)signal as a reference.A natural quasiperiodic electromagnetic wave event verifies SCM and EFD’s consistency in extremely low-frequency and very low-frequency(ELF/VLF)bands.This cross-calibration work is helpful to upgrade the data quality of CSES and brings valuable insights to similar electromagnetic detection solutions by low earth orbit satellites.
