Aiming at the problem of improving spacecraft~′s relative state parameters measure precision,the error factors of spacecraft relative state measure technique based on monocular computer vision and target feature are analyzed.

According to the project using wireless and laser methods to measure the relative state of two spacecrafts, measuring model was built.

According to the imaging theory of the image sensor, the relative states between objective spacecraft and image sensor are calculated by using the spatial coordinates in object frames of feature-points with symmetry structure and their coordinates in image plane frames.

A false measuring state in measuring resistance using two-armed bridge is put forward.

The fundamental principle and methods are introduced in this paper for measurement of the Thermal Neutron Flux Rate of 300 # 1 targets with the absolute and relative measurement systems of No.

The simultaneous adjustment of the absolute and relative measurements and systematic error correction among the relative measurements have been carried out in the paper.

This article introduced the practice of combining teach- ing with dial test indicator block of a relative measure and dial test in- dicator diameter with a 1,000-foot relative measurement methods and steps.

Techniques such as symmetrical layout of three sensors,relative measuring method,and averaging of the measuring results,are presented.

The article dissertates the effects of the alignment workpiece in the designing of inspection fixture, through some detailed examples, as well as summons the main advantages of applying the alignment workpiece in the relative measuring.