Locating method based on non-synchronous reception

A positioning method and non-simultaneous technology, applied in the key field of satellite navigation signal positioning

Active Publication Date: 2015-01-21
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0010] In view of this, the present invention provides a positioning method based on non-simultaneous reception, which can solve the positioning p...

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  • Locating method based on non-synchronous reception
  • Locating method based on non-synchronous reception
  • Locating method based on non-synchronous reception

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Embodiment Construction

[0049] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0050] In complex environments such as high-rise buildings in the city, under the shade of trees, in canyons, and fast switching, satellite navigation signals will be blocked or interfered. The number of visible satellites is less than four, and the signal duration is generally around 10ms to 1s. In this case, traditional navigation and positioning methods cannot track the signal to obtain navigation messages and provide positioning and navigation services. In view of this situation, the present invention provides a positioning method, such as figure 1 As shown, the process of the positioning scheme includes the following steps:

[0051] Step 1: Get the navigation message.

[0052] Obtain the satellite ephemeris data, reference time, reference position (as the rough position of the receiver described below) and other information needed for positioning t...

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Abstract

The invention discloses a locating method based on non-synchronous reception. The locating method can solve the problem of location under discontinuous navigation signal reception, and the usability of satellite navigation in city canyons and in the complex environments of fast switching and the like is improved. A mode of refining code phases is adopted for restoring the millisecond fractional parts of the moments of transmitting signals, an iterative least square method is adopted for restoring the millisecond integer parts of the moments of transmitting the signals, then the moments of transmitting the signals are combined, and then the pseudo-ranges and the satellite positions are calculated; observation vectors are constructed through linearization of the pseudo-ranges, a state vector of a receiver is constructed by adopting the position of the receiver and the receiver moving posture which can be obtained externally, and at each observation moment k, a Kalman filtering method is utilized for resolving an estimated value of the state vector, namely, the estimated value is the locating result of the current moment k; the different pseudo-ranges are adopted at the different observation moments k to obtain the observation vectors, and the step four is repeated so as to finish location.

Description

technical field [0001] The invention relates to the key technology of satellite navigation signal positioning, in particular to a positioning scheme based on non-simultaneous reception conditions to realize navigation positioning under non-simultaneous reception of navigation signals. Background technique [0002] With the development of satellite navigation technology, the application range of navigation receivers is getting wider and wider, and there are more and more demands for navigation and positioning in complex environments such as urban high-rise buildings, under the shade of trees, in canyons, and fast switching. However, the navigation receiver is greatly affected by the environment. When the user is in these complex environments, the satellite navigation signal will be blocked or interfered, which will cause the satellite navigation signal received by the terminal to show discontinuous characteristics. For the commonly used positioning algorithm, the navigation r...

Claims

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Application Information

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IPC IPC(8): G01S19/06G01S19/30G01S19/26
CPCG01S19/06G01S19/26G01S19/30
Inventor 徐颖何智力袁洪刘杨斌曾茂书欧阳光洲
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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