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VLBI observation of narrow bandwidth signals from the spacecraft

机译：VLBI观测飞船的窄带宽信号

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We carried out a series of VLBI observations of Nozomi by using a dedicated narrow bandwidth VLBI system. The three carrier waves with frequency interval of 515 kHz were recorded in 3 channels of the system and correlated by a software method. As a result of the correlation, the residual fringe phases of the main carrier wave are obtained for every 1.3 seconds. We can also continuously track them for 100 minutes. The variation of the residual fringe phase is +/- 150 degrees. Moreover, we can derive succesively the group delay for every 100 seconds by using these three carrier waves. The RMS of the group delays is 13 nsec and its average is well accorded with the delay determined by the range and Doppler measurements within an error of 2 nsec. Consequently, we confirmed the validity of the narrow bandwidth VLBI system, and it could be expected that this system, in addition to range and Doppler measurements, can be applied to three-dimensional tracking of a spacecraft and the precise gravity measurement of the Moon and the planets.
机译：我们通过使用专用的窄带宽VLBI系统对Nozomi进行了一系列VLBI观测。将频率间隔为515 kHz的三个载波记录在系统的3个通道中，并通过软件方法进行关联。作为相关的结果，每1.3秒获得主载波的残留条纹相位。我们还可以持续跟踪它们100分钟。残留条纹相位的变化为+/- 150度。而且，通过使用这三个载波，我们可以成功地每100秒导出一次群延迟。组延迟的RMS为13纳秒，其平均值与误差在2纳秒内的由距离和多普勒测量确定的延迟非常吻合。因此，我们确认了窄带宽VLBI系统的有效性，并且可以预期，该系统除范围和多普勒测量外，还可用于航天器的三维跟踪以及月球和月球的精确重力测量。行星。

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