Deep space probe track autonomous control method
A deep space probe and autonomous control technology, applied in the aerospace field, can solve problems such as slow speed and poor robustness, and achieve the effect of improving convergence and robustness, and improving solution speed.
Active Publication Date: 2020-06-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[0005] In view of the poor robustness of the existing methods and the slow speed of solving the optimal control problem, the technical problem to be solved by a deep space detector track autonomous control method disclosed in the present invention is: to provide a deep space detector based on the concept of convex optimization. The method of predictive control of the orbit model of the empty detector can solve the orbit optimal control problem relatively quickly when re-planning the orbit, which meets the needs of online implementation of autonomous control. At the same time, the convex optimization has strong convergence and good robustness. The obtained solution is the global optimal solution
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Embodiment 1
[0050] Such as figure 2 As shown, this embodiment discloses a method for autonomously controlling the orbit of a deep space probe, and the specific implementation steps are as follows:
[0051] Step 1: discretize the nominal orbit of the known optimal design to obtain the discretization data of the nominal orbit state and control quantity.
[0052] The orbital dynamics model of the deep space probe is established as follows:
[0053]
[0054] Among them: r, v, m respectively represent the position, velocity and mass of the detector; T is the three-dimensional thrust vector of the detector; μ represents the gravitational coefficient of the sun, α fuel is the mass consumption rate of the detector.
[0055] Since the thrust generated by the propulsion system of the probe is limited, the modulus length of the three-dimensional thrust vector of the probe should meet the following constraints:
[0056] ||T||≤T max
[0057] let x=[r T v T m] T ,
[0058] Known nomina...
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The invention discloses a deep space probe track autonomous control method and belongs to the technical field of aerospace. The method comprises steps of discretizing a known optimally designed nominal orbit to obtain a nominal orbit state and discretized data of a controlled quantity; for a current control period, obtaining an estimated state of a detector at the subsequent moment according to the estimated value of a navigation system; taking the current state as an initial orbit value, taking a terminal state of the nominal orbit as a target value, solving an optimal control problem by adopting a sequence convex optimization method, and re-planning the detector transfer orbit to obtain a new orbit control law; executing track control by the detector according to the new control instruction in the control period till the next control moment is reached; repeatedly iterating the above steps till reaching the terminal moment, and terminating autonomous control of the track. The method is advantaged in that an optimal control problem is solved through convex optimization, the speed is high, convergence is high, robustness is good, and the obtained solution is a globally optimal solution.
Description
technical field [0001] The invention relates to a method for autonomously controlling the track of a deep space probe, belonging to the technical field of aerospace. Background technique [0002] During the interplanetary flight, the deep space probe will be affected by various factors such as launch error, navigation error, thruster execution error, etc., and will gradually deviate from its predetermined design orbit, making the probe unable to reach the target position, resulting in the failure of the detection mission; On the other hand, the deep space probe is far away from the ground measurement and control station during the mission, and the communication time is long, so it is impossible to rely on the ground measurement and control system to implement the orbit control of the probe. Therefore, this requires deep space probes to have autonomous orbit control capabilities. With the increasingly urgent demand for detector autonomy in deep space exploration missions, th...
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IPC IPC(8): B64G1/24
CPCB64G1/242B64G1/247
Inventor 尚海滨杨浩瀚崔平远韦炳威
Owner BEIJING INSTITUTE OF TECHNOLOGYGY