Development of an intelligent receiver for a planetary probe

行星探测器智能接收器的研制

• 批准号: 09650412
• 负责人: HASHIMOTO Kozo
• 金额: $ 2.18万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650412/
• 关键词: Digital Signal Processor; Data Compression; Subband Coding; Digital Down Converter; Planetary Probe; Wave receiver; Sweep receiver

The objective of this research is to develop an intelligent receiver which efficiently transmits wave data observed by an earth satellite and planetary probe.Development of data compression method and its evaluation was performed by an prototype of an intelligent receiver which composed of an IBM/PC compatible board computer, A/D converter, Digital Signal Processor (DSP), etc in 1997. An data compression method by variable block-length subband coding is developed, its compression rate and processing speed for various waveforms observed by the Geotail satellite using CPU and/or DSP were evaluated, and its usefulness was confirmed.A sweep receiver for the intelligent receiver using Digital Down Converter (DDC) was developed in 1998. The DDC digitally convert a frequency of A/D converted data to a lower frequency. First, observed frequencies are converted to a analytic signal of a *50kHz bandwidth whose center frequency is equal to a local frequency. This converted waveform can be efficiently sent by the data compression method shown above. Their frequency spectra can be analyzed using the Fast Fourier Transform (FFT). A frequency analyzer for frequencies up to 2MHz with about 200Hz resolution has been developed and can process data several tens times faster than the analog-type Geotail sweep receiver (SFA).A high resolution and high speed frequency analyzer and data compression methods have been developed successfully. These results could be used for planetary probes in the future.

本研究的目的是开发一种能够高效地传输地球卫星和行星探测器观测到的波形数据的智能接收机。1997年，由IBM/PC兼容板计算机、A/D转换器、数字信号处理器(DSP)等组成的智能接收机原型进行了数据压缩方法的开发和评估。提出了一种变块长子带编码的数据压缩方法，并对采用CPU和/或DSP的GeoTail卫星观测到的各种波形的压缩比和处理速度进行了评估，证实了该方法的有效性。DDC将A/D转换数据的频率数字转换为较低的频率。首先，将观测到的频率转换为中心频率等于本地频率的*50 kHz带宽的解析信号。该转换后的波形可以通过上面所示的数据压缩方法有效地发送。它们的频谱可以使用快速傅立叶变换(FFT)进行分析。研制了频率为2 MHz、分辨率约为200 Hz的频率分析器，其数据处理速度是模拟型地尾扫频接收机(SFA)的几十倍。成功地研制了一种高分辨率高速频率分析器和数据压缩方法。这些结果可能会在未来用于行星探测器。

项目成果

H.Matsumoto, T.Okada, K.Hashimoto 他: "Low frequency plasma wave analyzer(LFA)on the PLANET-B spacecraft" Earth, Planets and Space. 50-3. 223-228 (1998)

H.Matsumoto、T.Okada、K.Hashimoto 等人：“PLANET-B 航天器上的低频等离子体波分析仪 (LFA)”《地球、行星和空间》50-3 (1998)。

H.Matsumoto, T.Okada, K.Hashimoto, et al.: "Low frequency plasma wave analyzer (LFA) on the PLANET-B spacecraft" Earth, Planets and Space. 50-3. 223-228 (1998)

H.Matsumoto、T.Okada、K.Hashimoto 等人：“PLANET-B 航天器”地球、行星和太空上的低频等离子波分析仪 (LFA)。