GPS RECEPTION DEVICE

• US 20080297412A1
• Filed: 05/30/2008
• Published: 12/04/2008
• Est. Priority Date: 05/31/2007
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: HAMADA, Hiroshi
• Application Number:
  US12/130,964
• Publication Number:
  US 20080297412A1
• Time in Patent Office: Days
• US Class Current: 342/357.29
• CPC Class Codes: G01S 19/23 Testing, monitoring, correcting or calibrating of receiver elements
• CPC Class Codes: G01S 19/28 Satellite selection

Abstract

According to one embodiment, a GPS reception device includes a section which acquires information in radio signals from satellites, a storage section which stores parameters to select part of the satellites, a section which calculates pseudo-distances from the satellites to a reception point based on the acquired information and measures the position of the reception point based on calculation results obtained for the selected part, and a touch panel display which inputs the position of a known reception point. The device includes a section which calculates real distances from the satellites to the known reception point when the position is input, determines ranges of elevation and azimuth angles suitable for the measurement based on the elevation and azimuth angle values of the satellites preferentially set in an order in which differences between the real distances and the pseudo-distances become smaller and sets the ranges as parameters into the storage section.

Claims

1. A GPS reception device comprising:

a reception processing circuit configured to receive radio signals from a plurality of satellites and to acquire measurement information contained in the radio signals,

a parameter storage section configured to store parameters used to select at least two of the satellites,

a measurement processing section configured to calculate pseudo-distances from the satellites to a reception point based on the measurement information acquired by the reception processing circuit and to measure the position of the reception point based on calculation results respectively obtained for the selected satellites,

an input section configured to input a position of a known reception point, and

a control circuit configured to calculate real distances from the satellites to the known reception point when the position of the known reception point is input by use of the input section, to determine ranges of elevation angles and azimuthal angles suitable for the measurement based on the elevation angle values and azimuthal angle values of the satellites preferentially set in an order so that differences between the real distances and the pseudo-distances become smaller and sets the ranges of elevation angles and azimuthal angles as the parameters into the parameter storage section.

2. The GPS reception device of claim 1, wherein the control circuit comprises a map data storage section configured to store map data, a display section configured to display a map and a display control section configured to display a neighboring area map of the reception point obtained from the map data and a mark of the reception point arranged in the neighboring area map based on a measurement result of the measurement processing circuit.

3. The GPS reception device of claim 2, wherein the display section is a touch panel display which can be also used as the input section, configured to allow a user to input the position of the known reception point by operating a pointer with respect to the neighboring area map.

4. The GPS reception device of claim 3, wherein the display control section is configured to enlarge the neighboring area map for aiding the user input the position of the known reception point.

5. The GPS reception device of claim 1, wherein the GPS reception device is incorporated in a mobile instrument used while a user is walking.