A four-system pseudo-range positioning method based on dcb correction

A positioning method and four-system technology, applied in the field of four-system pseudo-range positioning based on DCB correction, can solve the problems of unclear correction effect and uncertain positioning accuracy whether it is within the required range, so as to improve accuracy, improve positioning accuracy, Overcoming the effect of low positioning accuracy

Active Publication Date: 2021-01-05
SOUTHEAST UNIV
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  • Claims
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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to provide a four-system pseudo-range positioning method based on DCB correction to solve the current four-system DCB correction effect is not clear, and the positioning accuracy in complex environments cannot be determined whether it is within the required range.

Method used

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  • A four-system pseudo-range positioning method based on dcb correction
  • A four-system pseudo-range positioning method based on dcb correction
  • A four-system pseudo-range positioning method based on dcb correction

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Embodiment

[0054] Embodiment: Adopt the observation file of the IGS tracking station PERT site on April 20, 2016 and the satellite precise ephemeris of this period provided by IGS as the experimental data to carry out the program test, solve and analyze from 0:00 am to 2:30 am, and the sampling interval is A total of 300 epochs of data in 30s.

[0055] Table 1 shows the statistics of the number of visible satellites in different combinations. From Table 1, it can be seen that the combination of four systems has obvious advantages in the number of visible satellites.

[0056] Table 1

[0057]

[0058] As shown in Figure 2(a)-(c), the positioning results of different combinations are shown. Among them, Figure 2(a) is the GPS positioning result, Figure 2(b) is the GPS+BDS positioning result, and Figure 2(c) is the GPS positioning result +BDS+GLO+GAL positioning results; it can be clearly seen from the figure that the combination of four systems is superior to other combinations in terms...

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Abstract

The invention discloses a four-system pseudo-range positioning method based on DCB correction. The method comprises the following steps that firstly a four-system combined positioning system correctsthe satellite clock error by using the DCB data provided with an IGS website in the pseudo-range single point positioning process; a weight matrix P is determined accordingly by using the satellite elevation; quality evaluation is further performed on the observation data, and the resolving proportion is determined according to the quality of the data; and the required observation epochs are screened so as to obtain the positioning resolving result. The disadvantage of low positioning accuracy can be overcome, the positioning accuracy and stability are better than those of other combination modes under various environments, and the positioning accuracy can still be enhanced by setting of the PDOP threshold under the condition of reduction of the continuous positioning capability even in the complex environment; the influence of the hardware delay deviation on the positioning result can be verified by DCB correction of the satellite clock error, and enhancement of the single frequency data accuracy is obvious; secondly, the method has substantial meaning in further developing the application range of pseudo-range positioning and defining the DCB correction effect.

Description

technical field [0001] The invention relates to a method for correcting a global navigation satellite system (GNSS) satellite positioning error, in particular to a four-system pseudo-range positioning method based on DCB correction. Background technique [0002] With the continuous development and improvement of the world's four major satellite navigation systems, the combination of four systems can provide users with more reliable and stable navigation and positioning results. Therefore, the research on the combination of four systems is attracting more and more attention from researchers. [0003] In the process of multi-system integrated satellite navigation and positioning, the influence of various errors and the weight of each system and each satellite in the solution process have different degrees of influence on the positioning results; in areas with serious occlusion, multi-system combination It can increase the number of observation satellites and improve the positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/42G01S19/40
Inventor 潘树国赵珏
Owner SOUTHEAST UNIV
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