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首页> 外文会议>58th International Astronautical Congress 2007 >CHARACTERIZATION OF THE THERMAL AND SOLAR PLASMA NOISE ON THE DOPPLER PERFORMANCE FOR THE MESSENGER MISSION
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CHARACTERIZATION OF THE THERMAL AND SOLAR PLASMA NOISE ON THE DOPPLER PERFORMANCE FOR THE MESSENGER MISSION

机译：信使任务的多普勒性能的热等离子体和等离子体噪声的表征

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In 2011, MESSENGER will be the first mission to orbit the planet Mercury. MESSENGER will achieve several scientific objectives, including the radio science requirement of determining the spherical harmonics of the planet's gravity field. The primary observations for assessing the gravity field are the Doppler data provided by the spacecraft radio frequency (RF) telecommunication system and the NASA Deep Space Network. The two strongest Doppler error sources for the MESSENGER mission are the thermal and solar plasma noise. A large portion of the Doppler data will be provided by a low-power RF link via the spacecraft's low-gain antennas, a configuration that increases the thermal noise contribution to the Doppler measurement error. The solar plasma noise is also large due to Mercury's close proximity to the Sun. A calibration and characterization plan of activities to be carried out during the cruise to Mercury has been implemented, and the first test results show fairly close agreement with the predictive model for error sources. Subsequent characterization will ensure that the radio science concept of operations once at Mercury will result in an accurate mapping of the gravity field.
机译：在2011年，信使号将成为第一个绕水星轨道飞行的任务。信使将实现若干科学目标，包括确定行星重力场的球谐函数的无线电科学要求。评估重力场的主要观察是航天器射频（RF）电信系统和NASA深空网络提供的多普勒数据。 MESSENGER任务的两个最强烈的多普勒误差源是热等离子体噪声和太阳等离子体噪声。低功率RF链路将通过航天器的低增益天线提供大部分的多普勒数据，这种配置会增加热噪声对多普勒测量误差的影响。由于水星离太阳太近，太阳等离子体噪声也很大。已经实施了对水星航行期间要进行的活动的校准和特征化计划，并且第一个测试结果显示与误差源的预测模型非常接近。随后的表征将确保一旦在Mercury进行操作时，无线电科学概念将导致重力场的精确映射。

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