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摘要:空间引力波探测中为实现引力波信号科学测量,卫星发射到预定轨道后需首先完成百万公里级 链路的构建。同时为保证引力波信号不会被 指向噪声淹没, 指向稳定性需达到nrad/Abstract:To realize scientific measurement of gravitational waves in the space gravitational wave detection, after launching into a predetermined orbit, the satellites must first construct a 100-km laser link. Furthermore, to prevent the gravitational wave signal from being flooded by laser pointing noise, the laser pointing stability must reach a magnitude of nrad/
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Key words:
- Taiji program/
- gravitational wave/
- laser acquisition/
- fine pointing
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表 1矫正过程不确定区域的误差预算
Table 1.Error budget of uncertain areas in correction process
误差项 平面内误差/μrad 平面外误差/μrad STR与卫星矫正误差 50 50 望远镜与卫星矫正误差 50 50 望远镜与望远镜指向驱动器矫正误差 25 25 望远镜指向驱动器绝对位置误差 0.5 0 飞船姿态的长期项漂移 30 30 望远镜平面内指向角相对飞船的长期项漂移 0.01 0 总计(线性和) 155.5 155 表 2CCD捕获过程不确定区域的误差预算
Table 2.Error budget of uncertain area in CCD acquisition process
误差项 误差值/μrad 导航误差 11.9 望远镜视线矫正残余误差 5 视线与输出光束角度误差 1 卫星姿态长期项漂移 5 望远镜平面内指向角相对飞船的长期项漂移 1 总计(线性和) 23.9 表 3QPD捕获过程不确定区域的误差预算
Table 3.Error budget of uncertain area in QPD acquisition process
误差项 误差值/μrad CCD捕获精度 0.04 卫星姿态与望远镜平面内指向角短期项抖动 0.1 QPD与CCD位置矫正偏差 1 总计(线性和) 1.14 表 4太极计划各级指向探测器要求
Table 4.Performance requirements of point sensors at various levels in Taiji program
STR CCD QPD 视场 0.35 rad 200 μrad 1.5 μrad 精度 5 μrad (RMS 3σ) 40 nrad (RMS 3σ) 10 nrad/ -
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