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Satellite navigation positioning resolving method based on Doppler smoothing pseudorange under high-sensitivity environment

A high-sensitivity, satellite navigation technology, applied in the field of satellite navigation calculation and positioning based on Doppler smoothed pseudo-range in a high-sensitivity environment, can solve the problems of large carrier phase measurement value, distortion, and inability to obtain, and achieve good positioning accuracy Effect

Inactive Publication Date: 2011-04-06
ZHEJIANG UNIV
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Problems solved by technology

However, under weak signal conditions, there is a large distortion in the carrier phase measurement value. At this time, the carrier phase smoothing pseudo-range method cannot obtain high-precision positioning results

Method used

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  • Satellite navigation positioning resolving method based on Doppler smoothing pseudorange under high-sensitivity environment
  • Satellite navigation positioning resolving method based on Doppler smoothing pseudorange under high-sensitivity environment
  • Satellite navigation positioning resolving method based on Doppler smoothing pseudorange under high-sensitivity environment

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Embodiment

[0041] Such as figure 1 As shown, the receiver tracks and captures the satellite signal and demodulates the navigation message, and at the same time reproduces and obtains real-time Doppler, message, pseudorange and other solution information. Under the control of the clock module, when the interruption time comes, the receiver sends the Doppler measurement value to the pseudo-range correction module, and sends the pseudo-range value to the channel processing module. The pseudo-range value corrected by Doppler smoothing is sent to the positioning module, and the final positioning result is obtained. In the present invention, the interruption time is 100ms.

[0042] Such as figure 2 As shown, the positioning method based on Doppler smoothing pseudorange in a high-sensitivity environment includes the following steps:

[0043]1. Read the reproduced Doppler measurement value and pseudorange value from the receiver, and judge the availability of the current pseudorange. Genera...

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Abstract

The invention discloses a satellite navigation positioning resolving method based on Doppler smoothing pseudorange under a high-sensitivity environment. In the invention, a pseudorange measuring value is smoothened through a Doppler measuring value reproduced by a receiver, the problem of serious distortion of a carrier phase during the smoothing pseudorange of the carrier phase under a condition of weak signals is solved. The method comprises the following steps of: correcting the pseudorange at every new epoch moment according to Doppler frequency offset reproduced by the receiver from the moment to the initial moment to acquire an initial moment pseudorange corrected value; averaging the initial moment pseudorange corrected value to obtain the initial moment pseudorange corrected average value when the quantity of the initial moment pseudorange corrected value reaches to the requirement of window width; and finally carrying out Doppler frequency offset correction from any moment to the initial moment based on the initial moment pseudorange corrected value to finally acquire high-accuracy pseudorange at any moment. The invention is suitable for various satellite navigation positioning resolving systems, such as a GPS (Global Position System), a GLONASS (Global Navigation Satellite System) and the like.

Description

technical field [0001] The invention relates to a satellite navigation solution and positioning method based on Doppler smoothing pseudo-range in a high-sensitivity environment. Background technique [0002] Satellite navigation and positioning technology has been widely used in aerospace, aviation, remote sensing, communication, surveying and mapping and other fields. With the growing demand for personal navigation and positioning services, GNSS has expanded from the initial positioning function to many fields, such as timing, vehicle navigation, telecommunications, earth science and even life safety. Due to its dual-use characteristics, GNSS is a strategic system related to national security and the success of future wars. All countries in the world are competing to develop GNSS systems. [0003] In some circumstances, satellite signals are severely attenuated. There are many reasons for the weakening of the signal, such as the obstruction of natural or artificial buildi...

Claims

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Application Information

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IPC IPC(8): G01S19/39G01S19/13
Inventor 王悦赵民建钟杰李立言李云飞任周丰
Owner ZHEJIANG UNIV
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