A method of astronomical positioning for incomplete measurement conditions
An astronomical positioning and incomplete technology, applied in the field of astronomical navigation, can solve the problems of inability to realize multi-satellite synchronous observation and limited navigation accuracy, and achieve the effect of improving positioning performance and high observation accuracy
Active Publication Date: 2018-02-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
However, for a small field of view star tracker, only a single navigation star can be observed at a time, and simultaneous observation of multiple stars cannot be achieved.
If only the observation information of a single star is used for astronomical positioning, since the measurement information does not meet the complete measurement conditions required for astronomical positioning, its navigation accuracy is relatively limited
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[0081]In order to verify the effectiveness of the astronomical positioning method proposed by the present invention for incomplete measurement conditions, the dynamic track of the cruise flight of an aviation vehicle is used for simulation analysis. In the navigation process, the comparison of the starlight altitude angle error after compensation and uncompensation using the method of the present invention is as follows figure 2 As shown, the comparison of starlight azimuth angle error after compensation and uncompensated by using the method of the present invention image 3 As shown, the comparison of longitude errors of astronomical positioning after being compensated and uncompensated by the method of the present invention is as follows Figure 4 As shown, the comparison between the astronomical positioning latitude error and the uncompensated astronomical positioning latitude error after adopting the method of the present invention is as follows Figure 5 shown.
[0082...
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The invention discloses an astronomical positioning method for incomplete measurement conditions. The method comprises observing different navigation fixed stars according to a day parting sequence through a small field star tracker, and carrying out sequential observation information compensation to obtain multi-star observation information needed by astronomical positioning calculation so that complete measurement conditions for astronomical positioning are achieved and high precision astronomical positioning is realized. The method cannot only utilize the characteristic of high single star measurement accuracy of the small field star tracker, but also can play the advantage of a high calculation precision of a multi-star astronomical localization algorithm, and can realize the astronomical positioning under incomplete measurement conditions.
Description
technical field [0001] The invention belongs to the technical field of astronomical navigation, and in particular relates to a method for astronomical positioning by sequentially observing a plurality of navigation stars under incomplete measurement conditions. Background technique [0002] The advantages of celestial navigation in terms of autonomy, concealment, and anti-electromagnetic interference make it one of the effective means to achieve continuous and reliable navigation in an environment where satellite navigation is unavailable. For the application of airborne astronomical navigation, it is mainly suitable to use a small field of view star tracker with the characteristics of less incident stray light, high signal-to-noise ratio of single star measurement, and day and night observation. [0003] Conventional astronomical positioning methods usually need to observe two or more navigation stars at the same time to achieve complete measurement conditions and obtain st...
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IPC IPC(8): G01C21/02G01C21/20
CPCG01C21/025G01C21/20
Inventor 王融熊智刘建业施丽娟殷德全邢丽闵艳玲罗玮
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS