Method and system for real-time correction of thrust vector of deep space probe
A deep space probe, thrust vectoring technology, applied in aircraft, transportation and packaging, aerospace vehicles and other directions, can solve problems such as the field of deep space exploration that cannot be applied, and achieve reduced fuel consumption, high-precision orbit control, and improved control. The effect of precision
Active Publication Date: 2022-03-29
SHANGHAI SATELLITE ENG INST
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Problems solved by technology
This method can only be adapted to the orbit control of spacecraft with high-precision orbit determination conditions, and cannot be applied in the field of deep space exploration
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[0052] Such as figure 1 As shown, according to the method for real-time correction of the thrust vector of the deep space probe provided by the present invention, the specific implementation is as follows:
[0053] 1) Use the accelerometer to measure and calculate the projection of the detector velocity increment in the system in real time;
[0054]The accelerometer is used to measure the acceleration caused by the non-conservative force acting on the detector, and the output result directly represents the velocity increment of the detector, and the projection of the thrust vector on the body is obtained
[0055] 2) Calculate the angle between the measured speed increment and the target speed increment;
[0056] target speed increment Obtained from the installation direction of the nominal thruster, the formula for calculating the angle between the measured value and the target value is:
[0057]
[0058] The included angle is the thrust vector direction deviation.
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The present invention provides a method and system for real-time correction of the thrust vector of a deep space detector, comprising: step 1: measuring the velocity increment of the detector in real time through an accelerometer, and calculating its velocity increment under the system; step 2: calculating The angle between the speed increment and the target speed increment under this system; Step 3: Determine whether the angle is greater than the preset correction threshold, if it is greater, calculate the corrected attitude quaternion, otherwise keep the corrected attitude quaternion as the previous one Beat value; Step 4: Calculate the corrected target attitude in real time, and introduce attitude closed-loop control to realize the correction of the velocity direction error caused by the thrust vector deviation. The invention can be used for self-correction of the thrust vector in the orbit change ignition stage of the deep space probe, improves the speed increment control accuracy during orbit control, and reduces fuel consumption.
Description
technical field [0001] The invention relates to the technical field of attitude dynamics, in particular to a method and system for real-time correction of the thrust vector of a deep space probe. Background technique [0002] In order to achieve the goals of breaking away from the gravity of the earth, entering the cruising orbit or entering the inter-satellite transfer orbit, re-entering the planet, and flying around the star, the deep space probe needs to change its orbit multiple times to meet the requirements of saving fuel and correcting the accuracy of orbiting. At the same time, in key orbital changes such as re-entry into the atmosphere and planetary capture, there is usually only one chance to change orbits, and high orbital control accuracy is required to ensure follow-up missions. During the planet capture phase, the probe needs to be ignited and decelerated. The deviation of the ignition direction is very likely to cause the probe to fail to form an orbit, and mo...
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IPC IPC(8): B64G1/24
CPCB64G1/24B64G1/244B64G1/245
Inventor 信思博张伟朱新波李绿萍方宝东王田野
Owner SHANGHAI SATELLITE ENG INST