Mobile terminal and method for obtaining location information about mobile terminal

• US 9,451,580 B2
• Filed: 07/19/2013
• Issued: 09/20/2016
• Est. Priority Date: 10/18/2012
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Luo, Yijun
• Primary Examiner(s): Williams, Kimberly A
• Application Number:
  US14/436,195
• Publication Number:
  US 20150304985A1
• Time in Patent Office: 1,159 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G01S 19/49 whereby the further system is an inertial position system, e.g. loosely-coupled
• CPC Class Codes: H04W 4/027 using movement velocity, acceleration information
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination

Abstract

The embodiment of the present document provides a mobile terminal and a method for obtaining location information about a mobile terminal. The method for obtaining location information about the mobile terminal comprises: turning on a satellite locating module of the mobile terminal, turning off the satellite locating module after current location information about the mobile terminal is obtained, and regarding the current location information as initial location information; a sensing module of the mobile terminal collecting motion information about the mobile terminal, and calculating variation of displacement of the mobile terminal according to the motion information; and obtaining actual location information about the mobile terminal according to the initial location information and the variation of displacement of the mobile terminal.

Claims

1. A method for obtaining location information about a mobile terminal, comprising:

turning on a satellite locating module of the mobile terminal, turning off the satellite locating module after current location information about the mobile terminal is obtained, and regarding the current location information as initial location information;

a sensing module of the mobile terminal collecting motion information about the mobile terminal, and calculating variation of displacement of the mobile terminal according to the motion information;

obtaining actual location information about the mobile terminal according to the initial location information and the variation of displacement of the mobile terminal;

wherein, the motion information comprises;

acceleration information and initial velocity information;

further comprising a correction step to the initial velocity after calculating the initial velocity;

wherein, the correction step comprises;

judging whether a difference value, between the variation of displacement of the last period obtained through the calculation via the motion information and the variation of displacement obtained directly through acquiring the location information twice by the satellite locating module, is within a preset range;

if yes, then no need to correct the initial velocity;

if not, then re-calculating the initial velocity.

2. The method according to claim 1, further comprising:

periodically turning on the satellite locating module of the mobile terminal to obtain the current location information of the mobile terminal, updating the initial location information, and setting the variation of displacement as zero.

3. The method according to claim 2, wherein, the step of periodically turning on the satellite locating module of the mobile terminal comprises:

starting a timer when the satellite locating module is turned off, and turning on the satellite locating module when time reaches a preset time threshold value;

or

judging whether the variation of displacement reaches a preset displacement threshold value; and

if yes, then turning on the satellite locating module.

4. The method according to claim 1, wherein, the step of collecting the initial velocity information of the mobile terminal comprises:

judging a motion state of the mobile terminal at an initial location;

if being in an static state, then the initial velocity being zero;

if being in a motion state, then calculating an initial velocity of a present period according to the variation of displacement of a last period and the acceleration information obtained in the last period.

5. The method according to claim 4, wherein, the step of calculating displacement changing information of the mobile terminal through the motion information comprises:

decomposing the acceleration and the initial velocity in a longitude direction, a latitude direction and a height direction; and

calculating the variation of displacement of the mobile terminal in the longitude direction, the latitude direction and the height direction according to an acceleration component and an initial velocity component decomposed in the longitude direction, the latitude direction and the height direction.

6. A mobile terminal, comprising a processor, configured to:

obtain current location information about the mobile terminal through a satellite locating module comprising a global positioning system (GPS) module or an assisted global positioning system (AGPS) module;

turn on the satellite locating module, and turn off the satellite locating module after the information is obtained;

collect motion information about the mobile terminal through a sensor, and calculate variation of displacement of the mobile terminal according to the motion information; and

obtain actual location information about the mobile terminal through processing the initial location information and the variation of displacement of the mobile terminal;

wherein, the motion information comprises;

acceleration information and initial velocity information;

wherein, the processor is further configured to;

judge whether a difference value, between the variation of displacement of the last period obtained through the calculation via the motion information and the variation of displacement obtained directly through acquiring the location information twice by the satellite locating module, is within a preset range;

if yes, then need not to correct the initial velocity;

if not, then re-calculate the initial velocity.

7. The mobile terminal according to claim 6, wherein, the processor is further configured to:

control the satellite locating module to periodically turn on to obtain the current location information of the mobile terminal, update the initial location information, and set the variation of displacement as zero.

8. The mobile terminal according to claim 7, wherein, the processor is configured to periodically turn on the satellite locating module of the mobile terminal by the following mode:

starting a timer when the satellite locating module is turned off, and turning on the satellite locating module when time reaches a preset time threshold value;

or

judging whether the variation of displacement reaches a preset displacement threshold value; and

if yes, then turning on the satellite locating module.

9. The mobile terminal according to claim 6, wherein, the processor is configured to collect the initial velocity information of the mobile terminal by the following mode:

judging a motion state of the mobile terminal at an initial location;

if being in an static state, then the initial velocity being zero;

if being in a motion state, then calculating an initial velocity of a present period according to the variation of displacement of a last period and the acceleration information obtained in the last period.

10. The mobile terminal according to claim 9, wherein, the processor is configured to calculate the displacement changing information of the mobile terminal by the following mode:

decomposing the acceleration and the initial velocity in a longitude direction, a latitude direction and a height direction; and

calculating the variation of displacement of the mobile terminal in the longitude direction, the latitude direction and the height direction according to an acceleration component and an initial velocity component decomposed in the longitude direction, the latitude direction and the height direction.