Quick recapturing method for signal of highly dynamic satellite navigation receiver

A satellite navigation and receiver technology, applied in the field of satellite navigation, to achieve the effect of improving recapture efficiency and shortening search time

Active Publication Date: 2012-01-25
SPACE STAR TECH CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

If the capture algorithm adopts the fast capture method, and the capture time is less than 1 second, then bit synchronization and frame synchronization are performed. Ideally, it is assumed to be 7 seconds, then the pseudorange observation can be given at least 8 seconds after the signal is captured. It is clearly intolerable for receiver carriers on urgent missions

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  • Quick recapturing method for signal of highly dynamic satellite navigation receiver
  • Quick recapturing method for signal of highly dynamic satellite navigation receiver
  • Quick recapturing method for signal of highly dynamic satellite navigation receiver

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Embodiment Construction

[0023] Recapture refers to the capture after the signal is out of lock for a period of time, which requires faster capture speed, and after the signal is captured, the observation data of the channel satellite signal should be formed immediately, and it can immediately participate in the positioning calculation under the condition of reliable ephemeris .

[0024] figure 1 It is the overall flow chart of the method for realizing rapid positioning after the signal is out of lock.

[0025] The module relationship of the system is: all modules take TIC interruption as the basic pace, and then traverse all channels (12) to monitor which channel is in the out-of-lock state, and judge the time of out-of-lock through the observation time scale recorded in each TIC interruption , to determine whether to perform a general two-dimensional search or to preset the code accumulator (the specific process is as follows image 3 shown),

[0026] In the channel recapture stage, the prior inf...

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Abstract

The invention discloses a quick recapturing method for a signal of a highly dynamic satellite navigation receiver. The quick recapturing method comprises the following steps of: detecting an unlocked passageway of the navigation receiver in each ergodic period; confirming to carry out an ordinary serial search or a quick recapturing search according to the unlocked state of the passageway; confirming a searching frequency point and a searching range in the quick recapturing search; acquiring a pseudo code of the next ergodic period according to a local pseudo code at the present moment; acquiring pseudo code adjusting quantity according to the local pseudo code and the pseudo code of the next ergodic period; and carrying out recapturing according to the pseudo code adjusting quantity. When the quick recapturing method is adopted, the navigation signal can be quickly recaptured and positioned after a signal is unlocked according to the characteristics of continuity and stability for the operation of the navigation signal under an actual high-dynamic condition.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and relates to a fast recapture method of a high dynamic satellite navigation receiver signal. Background technique [0002] The satellite navigation and positioning system is developing rapidly, providing positioning information for various static and dynamic applications in scientific research, military and civilian use. However, the GPS signal is transmitted by microwave, and the signal is easily attenuated and blocked, which is especially easy to cause the short-term signal loss of the mobile receiver and the lack of positioning. How to realize the fast positioning of the navigation receiver, especially when the navigation receiving signal is out of lock under high dynamic conditions, is a problem that the navigation receiver must face in the actual use process. [0003] The acquisition of traditional satellite navigation and positioning system signals is a two-dimensional searc...

Claims

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Application Information

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IPC IPC(8): G01S19/24G01S19/30
Inventor 张凤珊熊立张朋永胡博曹潇
Owner SPACE STAR TECH CO LTD
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