Description of the BDD-IIR: Electron and proton sensors on the GPS
Description of the BDD-IIR: Electron and proton sensors on the GPS
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BDD-IIR 说明：GPS 上的电子和质子传感器
DOI：
10.2172/674727
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发表时间：
1998
影响因子：
--
通讯作者：
R. Reedy
中科院分区：
文献类型：
--
作者：
T. Cayton;D. Drake;K. Spencer;M. Herrin;T. J. Wehner;R. Reedy
爆发探测器剂量计(BLOCK)IIR(BDD-IIR)是一种多用途硅探测器系统，计划在全球定位系统(GPS)Block 2补给系列的第一批12个航天器中的两个航天器上飞行，作为爆发探测器X射线仪器的替代品。该仪器测量了撞击GPS航天器(SV)的高能粒子通量，主要是捕获在地球辐射带中的高能电子，但也测量了太阳高能粒子和银河系宇宙射线。位于八个独立硅传感器前面的吸收器确定了测量入射粒子通量的能量阈值，每个传感器中的能量损失大小在广泛的能量范围内提供了离子和电子之间不完美但非常好的分离。对于两个传感器中的每一个，都使用了一个带有非常小开口的锥形准直器来处理低能粒子。对于四个传感器，厚屏蔽层上的五个小孔将每个传感器上的流量限制在可管理的水平。对于两个传感器，固体圆顶被用来测量高能电子和质子。这八个传感器提供了八个通道来确定从77keV到5 MeV的电子能谱，八个通道来确定从1.3到54 MeV的质子谱。直接从测量的电子能谱中推断出大范围等效屏蔽厚度下的辐射剂量率和总剂量。累积次数通常是240次S，也可以是24次、120次或4,608次S。这份报告描述了BDD-IIR的重要机械和电子特性，它的系统测试和校准，可以发送给它的命令，以及它返回的数据。
The Burst Detector Dosimeter (Block) IIR (BDD-IIR) is a multipurpose silicon detector system that is scheduled to fly on two of the first 12 spacecraft of the Global Positioning System (GPS) Block 2 Replenishment series as an alternative to the Burst Detector X-ray (BDX) instrument. This instrument measures energetic-particle fluxes impinging on the GPS space vehicle (SV), primarily energetic electrons trapped in the Earth`s radiation belt, but also solar energetic particles and galactic cosmic rays. Absorbers located in front of eight separate silicon sensors determine energy thresholds for measuring incident particle fluxes, and the magnitude of energy loss in each sensor provides an imperfect but very good separation between ions and electrons over a wide range of energies. For each of two sensors, a conical collimator with a very small opening is used for low-energy particles. For four sensors, five small holes in a thick shield limits the flux on each sensor to manageable levels. For two sensors, solid domes are used to measure high-energy electrons and protons. These eight sensors provide eight channels that determine the electron energy spectrum from 77 keV to > 5 MeV and eight channels determine the proton spectrum from 1.3 to > 54 MeV. The radiation dose rate and total dose for a wide range of equivalent shielding thicknesses is inferred directly from the measured electron energy spectrum. Accumulations times are usually 240 s but can also be 24, 120, or 4,608 s. This report describes the BDD-IIR`s important mechanical and electronic features, its system tests and calibrations, the commands that can be sent to it, and the data that it returns.