Method for broadcasting and receiving satellite navigation information by multiple rates

A technology of information rate and receiving method, which is applied in the field of satellite navigation systems, can solve the problems of high authorized information rate affecting the receiving threshold, longer first positioning time, and flexibility limitation, so as to shorten the first positioning time, improve flexibility, and realize The effect of simple process

Inactive Publication Date: 2011-04-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
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  • Claims
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Problems solved by technology

[0005] However, because these broadcasting methods use a single information rate (the rate before spread spectrum modulation after channel coding) to broadcast information, the flexibility is greatly limited. There are also problems such as longer first positioning time under low-rate information, authorization information High rate affects receiving threshold and other issues

Method used

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  • Method for broadcasting and receiving satellite navigation information by multiple rates
  • Method for broadcasting and receiving satellite navigation information by multiple rates
  • Method for broadcasting and receiving satellite navigation information by multiple rates

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Embodiment Construction

[0035] Immutable multi-rate replication advertising method:

[0036] There is a corresponding relationship between the subframe information rate and the subframe number when the information is broadcast.

[0037] In this embodiment, the information rate is determined in advance according to the applicable characteristics of various types of information, each subframe carries information types with fixed applicable characteristics, and the corresponding relationship between the subframe number and the information rate is set to the receiving end.

[0038] Among them, the applicable characteristics of the subframe information can be the service scope of the information, such as authorized service, open service, etc.; it can be the use environment of the information, such as serving the indoor weak signal environment, serving the aviation good signal environment, etc.; Ephemeris information, almanac information, etc.

[0039] The correspondence between the subframe number and th...

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Abstract

The invention discloses a method for broadcasting and receiving satellite navigation information by multiple rates and belongs to the field of satellite navigation systems. By the method, broadcast information is broadcasted in a way of multiple rates. An information rate is inconsistent with a symbol rate, so that the broadcast information is processed at the sending end in a way of copying or expanding of convolution to make the broadcast information broadcasted at the symbol rate. The broadcast information is recovered at the receiving end in a condensing way so as to restore the original broadcast information. Subframe information is broadcasted in a way of multiple rates so as to improve information broadcasting flexibility and reduce first positioning time at a low rate.

Description

technical field [0001] The invention relates to a method for broadcasting and receiving satellite navigation information at multiple rates, belonging to the field of satellite navigation systems. Background technique [0002] The navigation information in the satellite navigation system is a binary code stream modulated on the navigation satellite signal, and its content includes ephemeris information, almanac information, various correction parameters and other necessary information for user machine positioning calculation. Navigation information design includes two parts: information content design and dissemination method design. The broadcast method refers to the information layout format, coding method, broadcast rate, frame structure, inter-frequency broadcast sequence, and inter-satellite broadcast sequence, etc., which have certain influence on the performance indicators such as the receiving sensitivity, positioning accuracy, first positioning time, and integrity al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/00G01S19/13
Inventor 刘峰张炳琪陈禾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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