Overview: Space gravitational wave detection missions typically consist of three identical satellites, with two laser links between the satellites at an angle of sixty degrees forming a Michelson interferometer. The arm length changes are measured using high-precision inter-satellite laser interferometry. As a key component of the inter-satellite laser interferometry system, the telescope system needs to have picometer-level optical path stability, a wavefront error of λ/30, and stray light less than 10^?10 of the transmitted power. To meet the requirements of space gravitational wave detection for the telescope system, an optical and mechanical integrated analysis and optimization method is proposed to design and optimize the primary mirror and its supporting structure. The off-axis parabolic primary mirror adopts the side three-point support method, and the influence of the support point position on the mirror surface shape and the rigid body displacement under gravity conditions has been studied. Optimization of the size of the triangular lightweighting holes on the primary mirror has been performed, and density-based topology optimization has been used to optimize the support backplate while ensuring that the first-order mode of the primary mirror component remains essentially unchanged. The flexural matrix of the primary mirror component supported by a parallel bipod linkage structure was derived based on spinor theory, and an evaluation function for the support structure was established. The size parameter range of flexible support was preliminarily determined by Matlab analysis. A optical-mechanical integrated simulation platform is set up to optimize the parameters of the support structure using a weighted sum method to convert the multi-objective optimization problem into a single-objective optimization problem. The results showed that the first-order frequency of the primary mirror component system was 392.43 Hz. Under gravity and temperature loads, the deformation of the primary mirror surface was better than λ/60, the translational rigid body displacement was better than 2.5 μm, and the rotational rigid body displacement was better than 0.5 μrad, all of which met the design specifications. Under space thermal disturbance of 10 μK/Hz^1/2, the size stability of the primary mirror component, represented by the displacement of the central point of the mirror, was at a level of 10 pm/Hz^1/2.

为了解决地铁建设和运营阶段会对地面造成不同程度的影响，特别是海岛建设地铁，其地形地貌环境复杂，土层不稳定，地面形变研究困难等问题。基于哨兵-1的38景影像数据和自主采集的隧道点云数据，采用永久散射体合成孔径雷达测量技术、差分干涉测量短基线集时序分析技术和激光雷达技术对厦门岛范围内的地铁2号线沿线区域进行研究。将合成孔径雷达的两种技术结果进行精度对比，并与水准数据进行比较，验证其准确性，最后结合激光雷达技术对该地铁内部隧道扫描获取点云数据进行形变结果对比。实验表明，PS-InSAR技术形变速率在-24.21~24.19 mm/y之间，而基于SBAS-InSAR 技术的形变速率则在-22.86~33.79 mm/y，两种方法在形变监测过程中表现基本一致；与水准测量结果对比得到二者之间存在一定误差，误差集中在±7 mm以内，部分与水准点距离较远的误差在13 mm左右；而地下隧道沉降在-43.4~104.1 mm之间，中误差为28.44 mm，其结果与地面形变差异巨大。经过多次验证得知地下轨道交通隧道受到地面形变的影响较小。