Positioning device, method of controlling positioning device, and recording medium

a positioning device and positioning method technology, applied in the direction of height/levelling measurement, navigation instruments, instruments, etc., can solve the problems of large error in height information obtained from map data, large load on storage means, and large error in height information

Inactive Publication Date: 2009-11-05
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution allows for accurate height information acquisition in two-dimensional positioning while reducing the effects of poor positioning conditions and promptly updating height information, thereby enhancing the reliability and efficiency of GPS positioning.

Problems solved by technology

However, the load imposed on storage means is increased when holding the map data.
Moreover, the height information obtained from the map data may have a large error.
When using the height calculated during the preceding positioning using a set of GPS satellites with the minimum VDOP, the height may have a large error due to poor positioning conditions (e.g. environment in which the signal strength is weak or environment in which multipaths occur to a large extent) during the preceding positioning.
When using the height calculated during the preceding three-dimensional positioning, the height may also have a large error due to poor positioning conditions during the preceding positioning
However, since this technology updates the height information when the three-dimensional height information has specific reliability, the height information cannot be updated when the three-dimensional height information has low reliability (e.g. multipath environment).
This poses a problem in which the height information may not be promptly updated.

Method used

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  • Positioning device, method of controlling positioning device, and recording medium
  • Positioning device, method of controlling positioning device, and recording medium
  • Positioning device, method of controlling positioning device, and recording medium

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Embodiment Construction

[0030]The invention may allow a reduction in load imposed on the storage for holding the height data, ensures acquisition of accurate height information used for two-dimensional positioning while reducing the effects of poor positioning conditions during the preceding positioning, and allows the height information to be promptly updated.

[0031]According to one embodiment of the invention, there is provided a positioning device comprising:

[0032]an estimated height storage section which stores an estimated height;

[0033]a signal reception section which receives a satellite signal which is a signal from a satellite positioning system (SPS) satellite;

[0034]a two-dimensional height calculation section which calculates a height of a present position as a two-dimensional height by performing two-dimensional positioning which locates the present position based on the received satellite signals using the estimated height as a distance from the center of the earth;

[0035]a three-dimensional heig...

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Abstract

A positioning device includes an estimated height storage section which stores an estimated height H1, a signal reception section which receives a satellite signal which is a signal from a satellite positioning system (SPS) satellite, a two-dimensional height calculation section which calculates a two-dimensional height H2c by two-dimensional positioning using the estimated height H1, a three-dimensional height calculation section which calculates a three-dimensional height H2b by preliminary three-dimensional positioning during two-dimensional positioning, a height selection section which selects the two-dimensional height H2b or the three-dimensional height H2c in order to update the estimated height H1, and an updating section which updates the estimated height H1 with the two-dimensional height H2b or the three-dimensional height H2c selected by the height selection section.

Description

[0001]This application claims priority to U.S. patent application Ser. No. 11 / 882,734 and Japanese Patent Application No. 2006-228770. The entire disclosures of U.S. patent application Ser. No. 11 / 882,734 and Japanese Patent Application No. 2006-228770 are hereby incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a positioning device which utilizes signals from positioning satellites, a method of controlling a positioning device, and a recording medium.[0003]A positioning system has been used in practice which locates the present position of a GPS receiver utilizing a satellite positioning system (SPS) such as a global positioning system (GPS).[0004]The GPS receiver receives signals from GPS satellites and calculates the distance between each GPS satellite and the GPS receiver (hereinafter called “pseudo-range”) based on the difference between the time at which the signal is transmitted from each GPS satellite and the time at which the...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G01S5/14G01C21/00G01S19/42G01S19/48
CPCG01S19/42G01C5/00G01S19/01
InventorMIZUOCHI, SHUNICHIMURAGUCHI, YOSHIYUKI
OwnerSEIKO EPSON CORP