US 7,116,268 B2 · Position measuring apparatus

Abstract

A position measuring apparatus is disclosed. The apparatus has a receiver for receiving signals from multiple satellites and measuring the position of a mobile station based on the received signals. In addition, an angle determination unit determines angle range depending on the positional relation between the measured position of the mobile station and an obstacle. An orbit information extraction unit extracts orbit information indicating orbits of the satellites from the received signals. A measurement unit measures the quality of the signals from at least one satellite that is expected to exist within the angle range based on the extracted orbit information. Finally, a correction unit corrects the position of the mobile station to another position having a different height, according to the measured quality of the signal from the within-angle range satellite.

Claims24

Dependent claims

A position measuring apparatus, comprising:

a receiver for receiving signals from a plurality of satellites and measuring a position of a mobile station based on the received signals;
an angle determination unit for determining angle range depending on positional relation between the measured position of the mobile station and an obstacle;
an orbit information extraction unit for extracting orbit information indicating orbits of the satellites from the received signals;
a measurement unit for measuring quality of the signals from at least one of the satellites that is expected to exist within the angle range based on the extracted orbit information;
and
a correction unit for correcting the measured position of the mobile station to another position having a different height, according to the measured quality of the signal from the at least one of the satellites.

3 more elements

A position measuring apparatus mounted in a fixed reference station, for estimating a position of a mobile station moving in an area in communication with the fixed reference station, comprising:

a memory for storing position information relating to an obstacle;
a receiver for receiving position information of the mobile station that has been measured by the mobile station based on signals from a plurality of GPS satellites, and for receiving mobile station satellite information indicating at least one of the satellites from which the mobile station has received a signal;
a collator for collating reference station satellite information indicating at least one of the satellites from which the reference station has received a signal, with the mobile station satellite information, wherein a result of the collation indicates a reliable measured position if said satellites from which the mobile station received a signal are the same as said satellites from which the reference station received a signal, and an unreliable measured position if said satellites from which the mobile station received a signal are nor the same as said satellites from which the reference station received a signal;
and
a correction unit for correcting the measured position of the mobile station based on the result of the collation and coordinates of the obstacle.

2 more elements

A position measuring apparatus provided in a mobile station, for estimating a position of the mobile station moving in an area in communication with a fixed reference station, comprising:

a memory for storing position information relating to an obstacle;
a position measuring unit for measuring a position of the mobile station, based on signals from a plurality of GPS satellites;
a receiver for receiving reference station satellite information indicating at least one of the satellites from which the reference station has received a signal;
a collator for collating mobile station satellite information indicating the at least one of the satellites from which the mobile station has received a signal, with the reference station satellite information, wherein a result of the collation indicates a reliable measured position if said satellites from which the mobile station received a signal are the same as said satellites from which the reference station received a signal, and an unreliable measured position if said satellites from which the mobile station received a signal are not the same as said satellites from which the reference station received a signal;
and
a correction unit for correcting the measured position of the mobile station based on the result of the collation and coordinates of the obstacle.

3 more elements

Dependencies are inferred from the claim text.

Position measuring apparatus

Life of this patent

Position measuring apparatus

Life of this patent

Abstract

Claims24