Abstract
With the rapid development of the national economy, the digital city and smart city have become the development trends of China’s urbanization, proposing higher and higher requirements for earth mapping. The emergence of high-resolution mapping satellites has satisfied the demand for national economic development. Since China’s first satellite measuring scale of 1:10,000 was launched in 2019, thus GF-7 satellite has realized the arc-second attitude measurement accuracy, where the degree of stability reached 10- 5°/s. Based on the author’s multi-year research on the design of high-resolution satellite control system, the key technologies and design methods for the high-precision attitude measurement and control system were expounded, the validation results were explained, and the future direction for improving the control precision of the high-resolution mapping satellite was proposed in the end.
Highlights
The mapping satellites have a late start in China, and the current civilian mapping satellites are represented byA visible-light satellite requires high positional accuracy for the plane and elevation of the ground target, which is directly influenced by the satellite attitude determination and orbit determination accuracies, besides the resolution of camera payload
According to the features of the high-resolution mapping satellite, and the difficulties existing in the control system design, the key design methods of the control subsystem, including system architecture, technical solution and reliability design, etc., were summarized, with the emphasis laid on the discussion about the high-precision attitude measurement technique and high-stability attitude control technique for the satellite control subsystem
The ordinary remote sensing satellites propose high precision and high stability requirements for the satellite control system according to the ground resolution, while the mapping satellites require the control system to provide accurate attitude information for each image
Summary
The mapping satellites have a late start in China, and the current civilian mapping satellites are represented by. Measurement accuracy of the control subsystem, attitude control precision and stability, satellite maneuverability, service life, reliability, and ground-based validation. Based on a general survey on mapping satellites in ALOS-1Ƚ3 precision :1.44 arc-second Stability:5u10-4q/s countries outside China, their control systems are all equipped with high-precision star sensors for the attitude. A satellite-ground large-closed-loop attitude compensation algorithm is designed, and the sensor inorbit parameter calibration technique is adopted to realize the steady in-orbit high-precision operation of the satellite. According to the features of the high-resolution mapping satellite, and the difficulties existing in the control system design, the key design methods of the control subsystem, including system architecture, technical solution and reliability design, etc., were summarized, with the emphasis laid on the discussion about the high-precision attitude measurement technique and high-stability attitude control technique for the satellite control subsystem. Based on the satellite’s in-orbit operation data, the in-orbit validation results of the performance indexes for the control subsystem and its critical newly developed standalone devices were given
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