Onboard software of Plasma Wave Experiment aboard Arase: instrument management and signal processing of Waveform Capture/Onboard Frequency Analyzer
Onboard software of Plasma Wave Experiment aboard Arase: instrument management and signal processing of Waveform Capture/Onboard Frequency Analyzer
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DOI：
10.1186/s40623-018-0838-0
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发表时间：
2018-05-04
影响因子：
3
通讯作者：
Shinohara, Iku
中科院分区：
文献类型：
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作者：
Matsuda, Shoya;Kasahara, Yoshiya;Shinohara, Iku
研制了Arase卫星上等离子体波实验（PWE）处理软件。PWE仪器有三个接收器：电场检测器，波形捕获/机载频率分析仪（WFC/OFA）和高频分析仪。我们设计了一个分时系统的伪并行处理方案，实现了每个接收机的信号同时处理。由于电场和磁场信号由不同的cpu处理，我们开发了一个在任务网络上使用共享数据包的同步观测系统。OFA连续测量功率谱、谱矩阵和复谱。OFA不仅可以得到整个极低频/甚低频等离子体波的活动，还可以得到所观测等离子体波的详细特性（如传播方向和极化）。我们对电场和磁场数据进行了同步观测，并利用这些数据成功地获得了哨子模合唱波的清晰波特性。为了测量原始波形，我们为WFC开发了两种模式，“合唱突发模式”（65,536个样本/秒）和“主爆发模式”（1024个样本/秒），分别用于测量哨子模式合唱波（通常在几百赫兹到几千赫的频率范围内）和主波（通常在几赫兹到几百赫兹的频率范围内）。我们成功地获得了沿Arase轨道的哨子模式合唱波和离子回旋模式波的电场和磁场波形。设计了软件型波粒相互作用分析模式。在这种模式下，我们连续测量电场和磁场波形，并将其传输到Arase卫星上的任务数据记录仪。我们还安装了一个机载信号校准功能（机载软件校准；SWCAL）。我们对轨道上的线探针天线进行了机载电路诊断和天线阻抗测量。我们利用SWCAL函数得到的结果来校准PWE得到的光谱和波形。
We developed the onboard processing software for the Plasma Wave Experiment (PWE) onboard the Exploration of energization and Radiation in Geospace, Arase satellite. The PWE instrument has three receivers: Electric Field Detector, Waveform Capture/Onboard Frequency Analyzer (WFC/OFA), and the High-Frequency Analyzer. We designed a pseudo-parallel processing scheme with a time-sharing system and achieved simultaneous signal processing for each receiver. Since electric and magnetic field signals are processed by the different CPUs, we developed a synchronized observation system by using shared packets on the mission network. The OFA continuously measures the power spectra, spectral matrices, and complex spectra. The OFA obtains not only the entire ELF/VLF plasma waves' activity but also the detailed properties (e.g., propagation direction and polarization) of the observed plasma waves. We performed simultaneous observation of electric and magnetic field data and successfully obtained clear wave properties of whistler-mode chorus waves using these data. In order to measure raw waveforms, we developed two modes for the WFC, 'chorus burst mode' (65,536 samples/s) and 'EMIC burst mode' (1024 samples/s), for the purpose of the measurement of the whistler-mode chorus waves (typically in a frequency range from several hundred Hz to several kHz) and the EMIC waves (typically in a frequency range from a few Hz to several hundred Hz), respectively. We successfully obtained the waveforms of electric and magnetic fields of whistler-mode chorus waves and ion cyclotron mode waves along the Arase's orbit. We also designed the software-type wave-particle interaction analyzer mode. In this mode, we measure electric and magnetic field waveforms continuously and transfer them to the mission data recorder onboard the Arase satellite. We also installed an onboard signal calibration function (onboard SoftWare CALibration; SWCAL). We performed onboard electric circuit diagnostics and antenna impedance measurement of the wire-probe antennas along the orbit. We utilize the results obtained using the SWCAL function when we calibrate the spectra and waveforms obtained by the PWE.