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Combined positioning method and system based on BD2 and ground-based navigation system

A navigation system and joint positioning technology, applied in the field of navigation and positioning, can solve the problems of complex terrain and inability to realize distance measurement channels

Active Publication Date: 2015-09-23
THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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Problems solved by technology

The system has the characteristics of simple construction, low cost, and high positioning accuracy; however, its disadvantage is that the surface terrain is complex, and the distance measurement channel may not be realized in some moments

Method used

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  • Combined positioning method and system based on BD2 and ground-based navigation system
  • Combined positioning method and system based on BD2 and ground-based navigation system

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Embodiment Construction

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Such as figure 1 As shown, the present invention provides a joint positioning method based on BD2 satellite and land-based navigation system. The method includes the steps:

[0035] S1, get the pseudorange ρ of the nth visible BD2 satellite (1n) . ρ (1n) For the error correction value, the correction formula is as follows:

[0036] ρ (1n) =D (1n) +δt u -I (1n) -T (1n)

[0037] Among them, D (1n) Is...

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Abstract

The invention discloses a combined positioning method and system based on BD2 and a ground-based navigation system, and the method comprises the steps: S1, collecting and correcting a pseudo-range value of a BD2 satellite; S2, calculating the spatial position of the BD2 satellite after earth rotation correction; S3, collecting and correcting the distance from a ground station of the ground-based navigation system to a distance measurement machine; S4, initializing the position of an aircraft and a clock error of a satellite receiver; S5, building and solving a corresponding linear equation group; S6, updating the roots of the linear equation group; S7, judging whether the iteration is ended or not: calculating an iteration threshold value delta, and enabling the calculation result obtained at step S6 to serve as the current position of the aircraft and enabling the iteration to be ended if the delta is not greater than a preset threshold value; or else, repeatedly carrying out step S5-S7 till the iteration is ended. The invention also provides a system achieving the above method. The method and system can greatly improving the positioning precision of a system, are not dependent on GPS resources, can be used during wartime, and are high in reliability.

Description

Technical field [0001] The present invention belongs to the technical field of navigation and positioning, and more specifically, relates to a joint positioning method and system based on BD2 and a land-based navigation system. Background technique [0002] In the past, the aircraft generally used GPS information for positioning during guidance and positioning. However, the GPS system is a national asset of the US government and is managed by the Department of Defense. The United States reserves the right to limit the strength and accuracy of GPS signals, or to shut down GPS services completely, so that the US military and allies can exclusively enjoy GPS services in times of conflict. [0003] Therefore, when developing their own aircraft, countries are increasingly considering positioning methods that do not rely on GPS information. With the further enhancement of the coverage and positioning accuracy of the BD2 satellite navigation system, the BD2 satellite navigation system ha...

Claims

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Application Information

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IPC IPC(8): G01S19/46
CPCG01S19/46
Inventor 李小丹杨道安彭克学白明顺高帆张晶邓潺周鄂炯
Owner THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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