Method of controlling electronic apparatus and electronic apparatus

Patent metadata

Field	Value
Publication number	US-9405014-B2
Application number	US-201314103930-A
Country	US
Kind code	B2
Filing date	Dec 12, 2013
Priority date	Dec 14, 2012
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

Correlation calculation is performed on a received signal of a GPS satellite signal as a positioning signal based on a given predicted frequency. Then, an erroneous frequency of the predicted frequency is estimated using carrier phase of the GPS satellite signal based on a result of the correlation calculation. Then, whether or not the erroneous frequency satisfies a predetermined allowable condition is determined, and whether or not an electronic apparatus is in a non-translational movement state in which the electronic apparatus moves while changing the location thereof with respect to a body of the user is determined.

First claim

What is claimed is:

1. A method of controlling an electronic apparatus that is carried by a user, receives a positioning signal, and calculates a location, comprising:
performing correlation calculation on the received positioning signal based on a given predicted frequency;
estimating an erroneous frequency of the predicted frequency using carrier phase of the positioning signal based on a result of the correlation calculation;
determining whether or not the erroneous frequency satisfies a predetermined allowable condition;
determining whether or not the electronic apparatus is in a non-translational movement state in which the electronic apparatus moves while changing the location thereof relative to a body of the user using a result of the determination; and
changing a method of controlling location calculation or changing display control if the electronic apparatus is determined to be in the non-translational movement state.

2. The method according to claim 1 , wherein the determination as to whether or not the electronic apparatus is in the non-translational movement state is to determine whether or not the electronic apparatus is in the non-translational movement state based on at least one index value of a number of times of occurrence, a frequency of occurrence, and a rate of occurrence of determination that the erroneous frequency does not satisfy the allowable condition.

3. The method according to claim 2 , wherein the determination as to whether or not the electronic apparatus is in the non-translational movement state includes:
performing filter processing of removing an unexpected value of the index value based on temporal change of the index value; and
determining whether or not the electronic apparatus is in the non-translational movement state based on the filter-processed index value.

4. The method according to claim 1 , wherein the positioning signal is a signal from each of a plurality of satellites,
further comprising selecting a satellite used for the non-translational movement state determination among the plurality of satellites,
wherein the determination as to whether or not the electronic apparatus is in the non-translational movement state includes determining whether or not the electronic apparatus is in the non-translational movement state using a determination result as to whether or not the erroneous frequency relating to the selected satellite satisfies the allowable condition.

5. The method according to claim 1 , wherein the positioning signal is a signal from each of a plurality of satellites, and
the determination as to whether or not the electronic apparatus is in the non-translational movement state is to determine whether or not the electronic apparatus is in the non-translational movement state based on at least one index value of a number, a frequency, and a rate of satellites for which the determination results do not satisfy the allowable condition among the plurality of satellites.

6. An electronic apparatus that is carried by a user, receives a positioning signal, and calculates a location, comprising:
a correlation unit that performs correlation calculation on the received positioning signal based on a given predicted frequency;
an estimation unit that estimates an erroneous frequency of the predicted frequency using carrier phase of the positioning signal based on a result of the correlation calculation;
a determination unit that determines whether or not the erroneous frequency satisfies a predetermined allowable condition;
a non-translational movement state determination unit that determines whether or not the electronic apparatus is in a non-translational movement state in which the electronic apparatus moves while changing the location thereof relative to a body of the user using the determination results; and
a control changing unit that changes a method of controlling location calculation or changes display control if positive determination is made by the non-translational movement state determination unit.

Assignees

• Seiko Epson Corp

Inventors

• Kawamoto Tomoya

Classifications

• G01S19/38 Primary

  Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system · CPC title

• G01S19/14

  specially adapted for specific applications · CPC title