Inversion Method Of Space Object Physical Paremeters Based On Time Series Photometric Signal

At present,satellite-dominated space targets are increasing,and the space environment is becoming more and more complicated.In national defense,space is an important strategic resource,and relevant researches on the situational awareness of space objects are of great significance to national security.In space-based long-distance detection conditions,the space object is generally point target without imaging structure and texture characteristics.It is important to take advantages of sequence signal on the space targets of on-track working conditions and basic physical properties of parameters inversion.It can effectively support the discrimination of the state of space targets and the decisions of on-orbit maintenance.In this paper,geostationary orbit satellites were studied.Most of the satellites located in geosynchronous orbit were military reconnaissance satellites,early warning satellites.These satellites usually operated in a three-axis stable condition.The motion characteristics of satellites could cause the change of photometric signal.The time-frequency analysis of satellite sequence photometric signal was used to determine their operation status.If a satellite was stable,its surface material could be retrieved.The surface material inversion was divided into two aspects: cooperation target and non-cooperation target.For the cooperation target,an analytical method was proposed to determine the surface material and estimate its area ratio.For the non-cooperative target,an inversion reconstruction method based on two-surface model was set up with a macroscopic characterization model with optical properties.After obtaining the material properties of targets,target posture inversion could be carried out,and then its motif was analyzed.In this paper,according to the requirements of remote monitoring system,the following researches were carried out:(1)This paper analyzed the spectral characteristics of target photometric signal,and proposed a method to determine the state of satellite operation.(2)A method of the inversion and posture inversion of surface material based on tri-axial stabilization satellite is proposed.Meanwhile,a simulation experiment was carried out to determine the validity and applicable conditions of algorithm.