共查询到20条相似文献,搜索用时 171 毫秒
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为了解决非球面在线检测的系统误差问题,针对系统误差产生的机理、误差的数学模型、分离方法以及补偿方法进行了研究.提出一种将空间误差投影到不同平面上进行分析从而解决测量系统误差的新方法并建立了各系统误差的数学模型.根据最小二乘法的基本思想,建立了基于标准球面的系统误差分离数学模型,得到了各参数的最小二乘估计值,并利用误差修正模型进行了校正.利用标准球面进行测量实验,验证了该方法的有效性和精确性.实验结果表明所提出的解决测量系统误差的思路可行,最终可使测量系统精度达到1μm数量级,从而满足精磨阶段在线检测的需要. 相似文献
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在多参数综合测量仪上用三点法测量圆心和半径时,仪器的制造和安装误差会引起测量系统误差,此误差用计算机进行了精确的模拟分析,得出了这一系统误差与被测圆心位移量成线性关系的结论,根据这一结论提出了对此系统误差进行修正的方法。 相似文献
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精确测量和确定同步卫星轨道是实现高精度导航、定位等应用的基础,光学测角定轨和卫星通信信号测时差定轨是两种最重要的无源测轨方法,各有优缺点.本文提出将光学测角与无线电通信信号测时差相结合,可实现对卫星的单次测量定位,多次测量提高定轨精度.推导得到卫星到光学站的距离表达式,实现对卫星位置的解析求解.通过GDOP方法,分析了光学站与无线电站的不同布站方式对定位精度的影响,据此提出了优化布站方式.通过计算机Monte-Carlo仿真,比较分析了联合测轨方法与单一光学测轨方法的测轨精度.仿真结果表明:若无系统误差时,24小时观测数据统计定轨位置误差为25 m,预报1周位置误差为200 m,约为单一光学方法的2/3;当存在系统误差时,需采用自校准方法估计系统误差,基于24小时观测数据的单一光学方法未能实现自校准定轨,而联合测轨方法定轨精度可达到约6 m,归一化系统误差估计精度优于0.1,预报1周的位置误差约为140m. 相似文献
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介绍了猫眼光学误差对激光跟踪三维坐标测量系统的影响及猫眼光学误差的主要来源,设计了一种猫眼光学误差的测量原理并构建了相应的测量装置,论述了测量数据处理方法以及在进行激光跟踪三维坐标测量时对猫眼光学误差进行修正的方法.在数据处理过程中,使用了非线性拟合算法来消除半球偏心和安装偏心对测量结果的影响,使用了二维插值算法来获取猫眼在任意入射方位角处的光学误差值.使用所构建的测量装置对Leica公司生产的CER75猫眼的光学误差进行了实际测量并对测量数据进行了处理.实验结果表明,被测猫眼在其接收角范围内的最大光学误差约为4μm. 相似文献
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在弹簧管式压力表的检定规程中,规定了因温度的变化、安装位置的差异等诸多因素引起的附加误差和修正方法.其中,有的误差是已定系统误差,可以修正;有的则因不能确定误差的大小,也无法确定其修正量,只能尽量控制减少,以达到准确测量的目的.因此,在使用中对这些误差的因素及有关使用事项应加以注意. 相似文献
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《纳米技术与精密工程》2018,(4)
Star sensors are indispensable spatial measurement sensors for high-resolution earth observation and astronomical observations, and the demand for high measurement accuracy of satellite sensors continues to increase; thus, the star sensor optical machine adjustment error cannot be ignored. The commonly used installation error correction method cannot solely meet the precision analysis requirements. In this paper, the relationship between the optical machine installation and the star sensor measurement error is analyzed, and several common adjustment error correction methods are compared. An adjustment method for optical machines is proposed to meet the requirements of very high precision star sensors. The assembly precision requirements of the investigated very high precision star sensor are analyzed considering the whole machine, and then the optical components are controlled through optical precision adjustments to satisfy the precision requirements. Finally, through the complete machine calibration, the star sensor precision adjustment for an optical machine structure is verified. This method meets the requirements of very high precision sensors and is suitable for the precision adjustment of optical machine structures, which is of practical significance to improve the precision of star sensors. 相似文献
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Doppler global velocimetry (DGV) is considered to be a useful optical measurement tool for acquiring flow velocity fields. Often near-wall measurements are required, which is still challenging due to errors resulting from background scattering and multiple-particle scattering. Since the magnitudes of both errors are unknown so far, they are investigated by scattering simulations and experiments. Multiple-particle scattering mainly causes a stochastic error, which can be reduced by averaging. Contrary to this, background scattering results in a relative systematic error, which is directly proportional to the ratio of the background scattered light power to the total scattered light power. After applying a correction method and optimizing the measurement arrangement, a subsonic flat plate boundary layer was successfully measured achieving a minimum wall distance of 100 μm with a maximum relative error of 6%. The investigations reveal the current capabilities and perspectives of DGV for near-wall measurements. 相似文献
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The need to take into account the dynamic error of optical trajectory measurement stations in order to increase the precision
with which the flight trajectory of aircraft is determined, is evaluated. An algorithm for determining the dynamic error is
presented and a calculation of the dynamic error for an optoelectronic station is given. 相似文献
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Aiming at the yaw problem caused by inertial navigation system errors
accumulation during the navigation of an intelligent aircraft, a three-dimensional trajectory
planning method based on the particle swarm optimization-A star (PSO-A*) algorithm is
designed. Firstly, an environment model for aircraft error correction is established, and the
trajectory is discretized to calculate the positioning error. Next, the positioning error is
corrected at many preset trajectory points. The shortest trajectory and the fewest correction
times are regarded as optimization goals to improve the heuristic function of A star (A*)
algorithm. Finally, the index weights are continuously optimized by the particle swarm
optimization algorithm. The optimal trajectory is found by the A* algorithm under the
current evaluation index, so the ideal trajectory is planned. The experimental results show
that the PSO-A* algorithm can quickly search for ideal trajectories in different environment
models, indicating that the algorithm has certain feasibility and adaptability, and verifies
the rationality of the proposed trajectory planning model. The PSO-A* algorithm has better
convergence accuracy than the A* algorithm, and the search efficiency is significantly
better than the grid search A star (GS-A*) algorithm. The PSO-A* algorithm proposed in
this paper has certain engineering application value. The researchers will study the realtime and systematic nature of the algorithm. 相似文献