Double-station radar space target relative navigation method based on GNSS reflected signals
A technology of space targets and reflected signals, applied in the field of relative navigation of space targets, can solve the problems that autonomous navigation algorithms cannot meet the requirements of relative navigation, increase the burden of ground measurement and control, and it is difficult to obtain observation information.
Inactive Publication Date: 2015-03-25
CHINA ACADEMY OF SPACE TECHNOLOGY
View PDF6 Cites 12 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The rendezvous sensor installed on the active spacecraft is difficult to obtain complete observation information when the spacecraft are far apart, so the autonomous navigation algorithm cannot meet the relative navigation requirements, and can only rely on the ground to guide the active spacecraft for rendezvous and docking. Increased the burden of ground measurement and control
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0052] Firstly, the definitions of the two coordinate systems are given.
[0053] (Earth center) inertial coordinate system: the coordinate point is located at the center of mass of the earth, the x-axis points to the vernal equinox, the z-axis points to the north pole of the earth, and the y-axis completes the right-handed orthogonal coordinate system. Among them, the commonly used geocentric inertial coordinate system is the J2000 coordinate system. Its coordinate origin is at the center of mass of the earth, the reference plane is the J2000.0 plane equator, the z-axis points north to the north pole of the plane equator, and the x-axis points to the J2000.0 plane equinox , the y-axis forms a right-angle right-handed system with the x-axis and z-axis;
[0054] Orbital coordinate system: that is, the local vertical horizontal coordinate system. The origin of the coordinates is fixed at the orbital position of the spacecraft. The x-axis points to the vector direction of the spa...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
According to a double-station radar space target relative navigation method based on GNSS reflected signals, a GSNN satellite is used as an irradiation source, the GNSS reflected signals in an active spacecraft are detected to serve as a relative measurement implementation way of a space target, the relative positions and relative speeds of spacecrafts are determined by means of a motion equation and a state estimation method, and a motion equation model of the target spacecraft and the active spacecraft is obtained at different distances. A detector installed on the active spacecraft is used for receiving direct signals and the reflected signals so as to measure the relative distance between the spacecrafts, and a double-station radar space target relative navigation motion model based on the GNSS reflected signals is established; an absolute state estimator and a relative state estimator are constructed by the adoption of the Kalman filtering method, so that information about the relative positions and relative speeds of the spacecrafts is obtained. According to the method, no independent rendezvous sensor is needed, and when the relative distance between the active spacecraft and the target spacecraft is varied, complete observation information can be obtained.
Description
technical field [0001] The invention belongs to the communication field and relates to a relative navigation method of a space object. Background technique [0002] The relative measurement of the space target refers to the real-time estimation of the relative state of the target aircraft under certain conditions based on the measurement of the spaceborne relative navigation equipment of the tracking aircraft, including relative position, relative velocity or other information representing relative motion. The relative measurement is the input of the guidance and control of the orbital rendezvous, accompanying and approaching process of the aircraft, and the performance of the relative measurement will directly affect the final guidance and control accuracy. At present, commonly used measurement methods for space targets include: microwave rendezvous and docking radar, laser radar, satellite navigation measurement, and CCD optical imaging measurement. Target, that is, there...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/51G01S19/52
CPCG01S19/51G01S19/52
Inventor 张建军王晓初薛明
Owner CHINA ACADEMY OF SPACE TECHNOLOGY