New Horizons Radio Science Experiment (REX) Jupiter Encounter Raw Data

This data set contains Raw data taken by the New Horizons Radio Science Experiment (REX) instrument during the Jupiter encounter mission phase. The New Horizons Jupiter encounter afforded no occultation or bi-static scattering geometries for which REX had sufficient sensitivity. The main REX activity during Jupiter flyby was a pair of radiometric scans of the High Gain Antenna (HGA), across the Jovian disk for the purpose of calibrating the REX radiometer experiment. The scans were conducted with New Horizons at ~100 Jupiter radii (Rj) both in-bound and out-bound, when the angular size of Jupiter was closely matched to the beamwidth of the HGA. The Jovian radiometric profile downlinked from the first scan exhibits high precision, and has been used to calibrate the REX radiometric response. Other activities during the mission phase, not associated with the proximity to Jupiter and with the main purpose of characterizing the instrument, were standard checkout operations, looking for weak tones in the REX band by using a large gain, mapping the HGA beam pattern, and an interference test with other instruments. The time periodof the data is 2007 January 5 through 2007 May 26.

本数据集收录新视野号无线电科学实验（New Horizons Radio Science Experiment, REX）仪器在木星交会任务阶段获取的原始观测数据。新视野号的木星交会任务未为REX提供具备足够灵敏度的掩星或双静态散射观测几何构型。此次木星飞掠期间，REX的核心活动为两次高增益天线（High Gain Antenna, HGA）辐射定标扫描：跨越木星盘面，以完成REX辐射计实验的校准工作。该扫描在新视野号距离木星约100木星半径（Rj）的入轨与逃逸阶段开展，此时木星的角尺寸与HGA的波束宽度高度匹配。首次扫描下传的木星辐射剖面精度优异，已被用于校准REX的辐射响应参数。该任务阶段的其余活动均与木星近距离飞越无关，其核心目的为仪器性能表征，包括采用高增益模式搜寻REX频段微弱信号的标准校验作业、测绘HGA波束方向图，以及与其他仪器开展的干扰测试。本数据集的时间覆盖范围为2007年1月5日至2007年5月26日。