Positioning device, method of controlling positioning device, and recording medium
First Claim
1. A positioning device comprising:
- an estimated height storage section which stores an estimated height;
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 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;
a three-dimensional height calculation section which calculates the height of the present position as a three-dimensional height by performing preliminary three-dimensional positioning which preliminarily locates the present position based on the received satellite signals without using the estimated height when performing the two-dimensional positioning;
a height selection section which selects the two-dimensional height or the three-dimensional height for updating the estimated height stored in the estimated height storage section; and
an updating section which updates the estimated height stored in the estimated height storage section using the two-dimensional height or the three-dimensional height selected by the height selection section.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
10 Claims
-
1. A positioning device comprising:
-
an estimated height storage section which stores an estimated height; 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 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; a three-dimensional height calculation section which calculates the height of the present position as a three-dimensional height by performing preliminary three-dimensional positioning which preliminarily locates the present position based on the received satellite signals without using the estimated height when performing the two-dimensional positioning; a height selection section which selects the two-dimensional height or the three-dimensional height for updating the estimated height stored in the estimated height storage section; and an updating section which updates the estimated height stored in the estimated height storage section using the two-dimensional height or the three-dimensional height selected by the height selection section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of controlling a positioning device including an estimated height storage section which stores an estimated height and a signal reception section which receives a satellite signal which is a signal from a satellite positioning system (SPS) satellite, the method comprising:
-
calculating 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; calculating the height of the present position as a three-dimensional height by performing preliminary three-dimensional positioning which preliminarily locates the present position based on the received satellite signals without using the estimated height when performing the two-dimensional positioning; selecting the two-dimensional height or the three-dimensional height for updating the estimated height stored in the estimated height storage section; and updating the estimated height stored in the estimated height storage section using selected one of the two-dimensional height and the three-dimensional height.
-
-
10. A computer-readable recording medium having a program recorded thereon, the program causing a computer included in a positioning device including an estimated height storage section which stores an estimated height and a signal reception section which receives a satellite signal which is a signal from a satellite positioning system (SPS) satellite to execute:
-
calculating 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; calculating the height of the present position as a three-dimensional height by performing preliminary three-dimensional positioning which preliminarily locates the present position based on the received satellite signals without using the estimated height when performing the two-dimensional positioning; selecting the two-dimensional height or the three-dimensional height for updating the estimated height stored in the estimated height storage section; and updating the estimated height stored in the estimated height storage section using selected one of the two-dimensional height and the three-dimensional height.
-
Specification