A precision closed-loop orbit control device for microsatellites

Abstract

The present invention provides a micro-satellite precision closed-loop orbit control device, including a casing, an acceleration sensitive meter, an accelerometer circuit, and a digital processing circuit. The device is used to: receive orbit control instructions, calibration instructions, and parameter revisions sent by a host computer Command; time synchronization; measure linear acceleration and convert sensitive signals into pulse signals; calculate the actual equivalent of pulse signals and accumulate them. When the accumulated value meets the threshold requirements, send a control signal to close the solenoid valve of the track control thruster. Complete an orbital control. The invention can be sensitive to acceleration, and the acceleration measurement resolution and bias value stability are high; the start and end time of orbit control can be precisely synchronized with the measurement time; the orbit control uses acceleration as feedback, which can achieve higher precision; When the thruster is open-loop time controlled, the precision loss caused by the thrust drop; the success rate of one orbit change is improved, and the high-frequency orbit control caused by the low orbit control accuracy is reduced.

Description

technical field [0001] The invention relates to the technical field of spacecraft orbit control, in particular to a precision closed-loop orbit control device for a tiny satellite. Background technique [0002] The orbit of near-Earth satellites is elliptical or circular, but due to the influence of perturbation and resistance, the actual orbit changes from the nominal orbit all the time. Changes accumulate to the point that orbit control is required in order to avoid them affecting satellite missions. Return the satellite to the nominal orbit, which is near the nominal orbit in practical applications. [0003] Orbit control involves all aspects, including orbit measurement, orbit control strategy and instructions, orbit control realization and so on. Orbit measurement is equivalent to "navigation", and navigation is the premise of orbit control. After the measurement is accurate, by comparing the deviation between the actual track and the nominal track, a control strateg...

AI Technical Summary

Problems solved by technology

And priority is given to inheritance and maturity, and it is difficult to adapt to the role of the controller in closed-loop control, because the computer adopts a polling mechanism, and many systems such as the control system, load system, measurement and control, data transmission, energy, and thermal control that hang around the computer , The device communicates and cannot provide high-frequency access to the accelerometer, so the control delay error cannot be avoided, which reduces the accuracy of the closed-loop control

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