An autonomous navigation method for ring-fire orbit based on spherical unscented transformation

Abstract

The invention relates to a method for autonomous navigation of orbit around fire based on spherical traceless transformation, belonging to the field of autonomous orbit determination; step 1, establishing a sigma point set according to the state quantity of the Mars probe in the current cycle; step 2, using the state of the current cycle respectively The quantity is the initial value, recursively deduce the state quantity of each feature point in the next period; Step 3, calculate the approximate unscented mean and the approximate unscented state quantity covariance of the current period; Step 4, calculate the i-th feature point of the next period Calculate the measurement forecast value for the next period. Step 5. Calculate the measurement covariance P of the Mars rover in the current period yy and measure-state quantity covariance P Xy ; Step six, calculate the gain value K of the next cycle k+1 ; and according to the gain value K of the next cycle k+1 Calculating the State Quantity of the Mars Probe in the Next Period The present invention realizes that the probe can use the full field model of the Mars probe during the autonomous navigation process, and improves the accuracy of the orbit determination independently.

Description

technical field [0001] The invention belongs to the field of autonomous orbit determination, and relates to an autonomous navigation method for orbit around fire based on spherical traceless transformation. Background technique [0002] During the long-term flight around the fire, the Mars rover conducts global remote sensing detection of Mars, and navigation is the basis for the attitude reference calculation of the whole device. [0003] Earth satellite orbit calculations generally provide initial orbit values ​​based on ground orbit measurements, and perform orbit recursion online or use spaceborne GNSS equipment to solve high-precision orbit data. However, for the Mars rover, in the process of flying around Mars, it has the characteristics of long distance from the ground and no GNSS available. The orbit calculation method simply borrowing from the earth satellite has a narrow measurable window, no GNSS available, and large information delay. In order to improve the rel...

AI Technical Summary

Problems solved by technology

However, for the Mars rover, in the process of flying around Mars, it has the characteristics of long distance from the ground and no GNSS available. The orbit calculation method simply borrowing from the earth satellite has a narrow measurable window, no GNSS available, and large information delay. In order to improve the reliability and accuracy of the orbit calculation of the Mars orbiter, it is necessary to reduce the dependence on the ground and realize the independent orbit calculation

[0004] In addition, the currently widely used linearized navigation algorithm discards high-order terms and has poor accuracy

Unable to meet the requirements of Mars rover ring fire detection

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