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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >Effect of Phase Pattern of Antennas Onboard Flying Spin Satellites on Doppler Measurements
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Effect of Phase Pattern of Antennas Onboard Flying Spin Satellites on Doppler Measurements

机译：天线载频自旋卫星的相位模式对多普勒测量的影响

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摘要

The effect of the phase patterns of antennas onboard flying spin satellites on the Doppler measurements is reported. Phase patterns mean that there are deviations in wave fronts from perfect sphericity, expressed as a function of the angular position around the antenna. We analyzed what effect the phase patterns of dipole and patch antennas onboard two flying spin satellites, Rstar and Vstar, used in the Japanese lunar mission, SELENE (KAGUYA), had on 2-way and 4-way Doppler measurements, and detected higher harmonics in the spin frequency up to an order of 26 in the Doppler frequency. We developed a low-pass filter (LPF) using a Kaiser window, with the optimal parameters empirically determined, to remove the influence of phase patterns and to precisely conserve information on the lunar gravity field. We processed the 2-way and 4-way Doppler data of SELENE by using LPF. After using LPF, a high degree of accuracy of about 0.001 Hz was achieved for the 2-way Doppler measurements, and signals that reflected the gravity field on the far side of the Moon were first detected from the 4-way Doppler data. We also suggested a method for estimating the phase response of satellite antennas using the Doppler frequency variations. In order to estimate the Doppler frequency variation, a filtering technique was adopted to extract the harmonics of interest in the residual signal, from which the antenna phase pattern was derived.
机译：据报道，飞行自旋卫星上天线的相位模式对多普勒测量的影响。相位模式意味着波前与完美球形之间存在偏差，表示为天线周围角位置的函数。我们分析了日本登月任务SELENE（KAGUYA）所使用的两架飞行自旋卫星Rstar和Vstar上的偶极天线和贴片天线的相位模式对2向和4向多普勒测量的影响，并检测到更高的谐波自旋频率中的频率高达多普勒频率的26。我们使用Kaiser窗口开发了一种低通滤波器（LPF），并凭经验确定了最佳参数，以消除相位模式的影响并精确保存月球重力场上的信息。我们使用LPF处理了SELENE的2向和4向多普勒数据。使用LPF之后，两向多普勒测量获得了约0.001 Hz的高精度，并且首先从四向多普勒数据中检测到了反映月球远端重力场的信号。我们还提出了一种使用多普勒频率变化估算卫星天线相位响应的方法。为了估计多普勒频率变化，采用了一种滤波技术来提取残留信号中的感兴趣谐波，从而从中得出天线相位图。

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