Ground user navigation and positioning method based on Beidou Ka inter-satellite link signal

An inter-satellite link, navigation and positioning technology, applied to satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as failure, navigation service performance degradation, etc.

Active Publication Date: 2018-11-27
WENZHOU UNIVERSITY
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Problems solved by technology

[0004] Aiming at the problem that the L-band signal of GNSS is susceptible to intentional or unintentional interference and spoofing, which leads to the degradation or even failure of ground regional navigation service performance, the present invention proposes a ground user navigation and positioning method based on the Beidou Ka inter-satellite link signal, This method uses the receiver clock model and the inertial navigation system to reduce the distance values ​​measured at different times to the same time to realize the time synchronization of the ranging values, and then use the Kalman filter algorithm to estimate the ground user position in real time

Method used

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Embodiment

[0135] Utilize the data that track generator produces to carry out emulation verification to the inventive method, motion track is as figure 1 As shown, the initial position is set at 110° east longitude, 30° north latitude, and 0m altitude, the initial roll angle, pitch angle, and heading angle are all 0°, and the initial speed in the east, north, and sky directions is 0m / s . Without loss of generality, the motion process includes uniform acceleration linear motion, uniform speed linear motion, climbing, contour turning, diving, etc., and the duration is 3600s. At the same time, it is assumed that the zero bias of the three gyroscopes in the inertial navigation system is 0.1° / h, the random drift is 0.1° / h, and the zero bias of the three accelerometers is 10- 4 g, the random drift is 10- 4 g, The random error of the receiver clock is 0.1m, and the error of the tropospheric model is 0.5m. Using precise ephemeris (including precise orbital ephemeris and precise clock ephemeri...

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Abstract

The invention provides a ground user navigation and positioning method based on a Beidou Ka inter-satellite link signal. The method comprises that it is supposed that between epochs k-1 and k (k=1, 2,3...), a user in an area with a Beidou inter-satellite signal reception terminal in the ground generate inter-satellite link unidirectional range finding values with N different Beidou satellites indifferent time, and N range finding equations are obtained; (2) user positions in the range finding equations are reduced to time Tk in a unified way by using a receiver clock model and inertial navigation information; and (3) on the basis of time synchronization of range finding values, the ground user estimates the positions of himself/herself in real time in a Kalman filtering positioning algorithm. Thus, interference and cheating sources aimed at the L-frequency-band navigation signals can be avoided, possible problems caused by failure of the L-frequency-band navigation signals are solvedto certain extent, and the navigation safety of a key area in the special scene is ensured.

Description

technical field [0001] The invention relates to a ground user navigation and positioning method, in particular to a ground user navigation and positioning method based on the Beidou Ka inter-satellite link signal. Background technique [0002] Global Navigation Satellite System (GNSS) has become an important space infrastructure for expanding human activities and promoting social development. Accuracy, integrity, continuity and availability are the four key indicators of GNSS. Wherein, usability means that users of the navigation system can obtain their own location information according to the received navigation signals. Traditional L-band navigation signals are vulnerable to various intentional or unintentional interference and deception, especially some key areas and sensitive areas, which will become the targets of various interference sources and deception sources in special periods, resulting in L-band navigation signals in the The navigation performance in this are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/47G01S19/21
CPCG01S19/21G01S19/47
Inventor 李理敏项佳豪肖洋姜兴龙梁广龚文斌余金培
Owner WENZHOU UNIVERSITY
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