Method for quickly determining spatial relative state under complex disturbance
A space and complex technology, applied in the field of satellite control, can solve the problems of large amount of calculation and occupying limited resources on the satellite, etc., and achieve the effect of small amount of calculation, obvious accuracy and high accuracy of acquisition
Inactive Publication Date: 2020-12-08
SHANGHAI JIAO TONG UNIV
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[0003] The present invention aims at the defect that complex disturbance items are processed by high-order compensation method in the prior art, which requires a large amount of calculation, takes up limited resources on the planet, and is not suitable for space mission onboard processing requirements, and proposes a rapid determination of the relative state of space under complex disturbances method, which can estimate the system process noise online and in real time under the condition of spatial disturbance, and pass the result to the relative state determination step for fast solution
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[0019] This embodiment relates to a method for quickly determining a spatial relative state under complex disturbances, including the following steps:
[0020] Step 1: The description of the relative state of space under complex disturbances, which is to properly select and expand the dynamic state variables describing the relative motion of space, express the motion process and measurement as nonlinear equations, and express the complex spatial disturbances as unconventional noise ;
[0021] Step 2: Estimate the upper bound of the dynamic recursion error, that is, evaluate the recursion error caused by inaccurate dynamic modeling, and use the linear matrix inequality theory to estimate the upper bound of the recursion error covariance matrix;
[0022] Step 3: Quickly determine the spatial relative state under complex disturbances and measurement updates, that is, under the condition of relative measurement information acquisition, use the adaptive recursive optimization metho...
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The invention discloses a method for quickly determining a spatial relative state under complex disturbance. The method comprises the steps of performing dimension expansion by selecting a dynamic state variable for describing the spatial relative motion, expressing a motion process and measurement as a nonlinear equation, and expressing the complex spatial disturbance as unconventional noise; performing upper bound estimation of a covariance matrix on recursion errors caused by inaccuracy of a kinetic model; and estimating and eliminating disturbance information contained in a measured valueby adopting an adaptive recursive optimization method so as to obtain spatial relative state information. According to the method, online real-time estimation can be performed on system process noisein the condition of spatial disturbance, and a result is transmitted to a relative state determination step for quick calculation.
Description
technical field [0001] The invention relates to a technology in the field of satellite control, in particular to a method for quickly determining the relative state of space under complex disturbances. Background technique [0002] Space missions such as satellite formation flight are mainly used in fields such as earth observation, precise positioning, astronomical observation, and electronic reconnaissance. These applications have high requirements for the accuracy of determining the relative state of space. In actual operation, the satellite will be affected by various complex interference forces such as the earth's non-spherical gravity, third-body gravity, solar light pressure, and atmospheric resistance. Under the influence of interference, the relative orbits of satellites flying in formation will change. Although these disturbance forces are very small compared with the gravitational force at the center of the earth, the long-term effect can still cause the satellite...
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IPC IPC(8): B64G1/24G06F30/20
CPCB64G1/24B64G1/245
Inventor 王晓亮龚德仁吴树范
Owner SHANGHAI JIAO TONG UNIV