Positioning method, apparatus, and mobile terminal

• US 10,520,595 B2
• Filed: 08/05/2014
• Issued: 12/31/2019
• Est. Priority Date: 08/05/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhang, Xiaoping
• Primary Examiner(s): Cumming, William D
• Application Number:
  US15/502,004
• Publication Number:
  US 20170234980A1
• Time in Patent Office: 1,974 Days
• Field of Search: 4554562, 340990
• CPC Class Codes: G01S 13/46 Indirect determination of position data
• CPC Class Codes: G01S 5/0264 at least one of the systems being a non-radio wave positioning system
• CPC Class Codes: G01S 5/0294 Trajectory determination or predictive filtering, e.g. target tracking or Kalman filtering
• CPC Class Codes: G01S 5/12 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial

Abstract

A positioning method and a mobile terminal in order to improve track fitting precision, eliminate erroneous track determining, improve a positioning presentation effect, and automatically set a suitable positioning frequency. The method includes determining, by the mobile terminal, an expected journey L, where the expected journey is an expected value of a distance traveled by the mobile terminal between two consecutive times of positioning, obtaining a speed value v of the mobile terminal, adjusting a positioning frequency according to the expected journey L and the speed value v of the mobile terminal such that a deviation of a distance traveled by the mobile terminal between two consecutive times of positioning from the expected journey L is less than a specified threshold, and performing positioning according to an adjusted positioning frequency.

Claims

1. A method, comprising:

determining, by the mobile terminal, an expected journey (L), wherein the L is an expected value of a distance traveled by the mobile terminal between two consecutive times of positioning the mobile terminal;

obtaining, by the mobile terminal, a speed value (v) of the mobile terminal;

determining, by the mobile terminal, a positioning frequency at which to position the mobile terminal, wherein the positioning frequency is a frequency at which a position of the mobile terminal is determined between the two consecutive times, and wherein a deviation between an actual distance traveled by the mobile terminal between the two consecutive times and the L traveled by the mobile terminal between the two consecutive times based on the positioning frequency is less than a specified threshold;

adjusting, by the mobile terminal, a current positioning frequency to be the positioning frequency; and

performing, by the mobile terminal, a positioning operation to determine one or more positions of the mobile terminal at one or more times according to the positioning frequency.

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

obtaining, by the mobile terminal, a second positioning time (t) of the mobile terminal according to the L and the v in response to triggering a first positioning operation comprising determining a first position of the mobile terminal; and

triggering, by the mobile terminal, a second positioning operation comprising determining a second position of the mobile terminal at the t.

3. The method according to claim 2, wherein obtaining the t comprises obtaining, by the mobile terminal, a time interval (T) according to a formula T=L/v, wherein the T is equal to a ratio of the L to the v, and wherein the t is a sum value of a current moment determined by the mobile terminal and the T.

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

obtaining, by the mobile terminal, a traveled distance (L′

) of the mobile terminal by performing integration on the v in terms of time starting from a time point at which a first positioning operation comprising determining a first position of the mobile terminal is triggered; and

adjusting, by the mobile terminal, the positioning frequency according to the L′ and

the L.

5. The method according to claim 1, wherein determining the L comprises:

obtaining, by the mobile terminal, a positioning error (R) and lengths of closed paths that surround all unreachable regions in a positioning scenario;

determining, by the mobile terminal, a value range of the L as 2R<

L<

(C/2) in response to a minimum closed path length (C) being greater than 4R;

determining, by the mobile terminal, the value range of the L as 2R<

L<

(C₁/2) in response to the C not being greater than 4R, wherein C₁ is a minimum closed path length greater than 4R; and

receiving, by the mobile terminal, an L selected by a user from the value range of the L.

6. The method according to claim 1, wherein determining the L comprises:

determining, by the mobile terminal, a current positioning scenario; and

determining, by the mobile terminal according to a preset correspondence between a positioning scenario and an L, the L corresponding to the current positioning scenario.

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

adjusting, by the mobile terminal, the positioning frequency according to the L and the v in response to the v not being equal to 0, and

adjusting, by the mobile terminal, the positioning frequency to 0 in response to the v being equal to 0.

8. The method according to claim 1, wherein before obtaining the v, the method further comprises triggering, by the mobile terminal, a positioning operation comprising determining a first position of the mobile terminal.

9. The method according to claim 1, further comprising adjusting, by the mobile terminal, the positioning frequency to a preset fixed positioning frequency in response to the mobile terminal not being able to obtain the v.

10. An apparatus, comprising:

a memory; and

a processor coupled to the memory and configured to;

determine an expected journey (L), wherein the L is an expected value of a distance traveled by the apparatus between two consecutive times of positioning the apparatus;

obtain a speed value (v) of the apparatus;

determine a positioning frequency at which to position the apparatus, wherein the positioning frequency is a frequency at which a position of the apparatus is determined between the two consecutive times, and wherein a deviation between an actual distance traveled by the apparatus between the two consecutive times and the L traveled by the apparatus between the two consecutive times based on the positioning frequency is less than a specified threshold;

adjust a current positioning frequency to be the positioning frequency; and

perform a positioning operation to determine one or more positions of the apparatus at one or more times according to the positioning frequency.

11. The apparatus according to claim 10, wherein the processor is further configured to:

obtain a second positioning time (t) according to the L and the v in response to a first positioning operation to determine a first position of the apparatus being triggered; and

trigger a second positioning operation to determine a second position of the apparatus at the t.

12. A mobile terminal, comprising:

a memory;

a processor connected to the memory;

an input apparatus connected to the processor; and

an output apparatus connected to the processor,

wherein by invoking an operation instruction stored in the memory, the processor is configured to;

determine an expected journey (L), wherein the L is an expected value of a distance traveled by the mobile terminal between two consecutive times of positioning the mobile terminal;

obtain a speed value (v) of the mobile terminal;

determine a positioning frequency at which to position the mobile terminal, wherein the positioning frequency is a frequency at which a position of the mobile terminal is determined between the two consecutive times, and wherein a deviation between an actual distance traveled by the mobile terminal between the two consecutive times and the L traveled by the mobile terminal between the two consecutive times based on the positioning frequency is less than a specified threshold;

adjust a current positioning frequency to be the positioning frequency; and

perform a positioning operation to determine one or more positions of the mobile terminal at one or more times according to the positioning frequency.

13. The mobile terminal according to claim 12, wherein the processor is further configured to:

obtain a second positioning time (t) of the mobile terminal according to the L and the v in response to triggering a first positioning operation to determine a second position of the mobile terminal; and

trigger a second positioning operation to determine a second position of the mobile terminal at the t.

14. The mobile terminal according to claim 13, wherein the processor is further configured to:

obtain a time interval (T) according to a formula T=L/v, wherein the T is equal to a ratio of the L to the v; and

determine the t as a sum value of a current moment determined by the mobile terminal and the T.

15. The mobile terminal according to claim 12, wherein the processor is further configured to:

obtain a traveled distance (L′

) of the mobile terminal by performing integration on the v in terms of time starting from a time point at which a first positioning operation to determine a first position of the mobile terminal is triggered; and

adjust the positioning frequency according to the L′ and

the L.

16. The mobile terminal according to claim 12, wherein the processor is further configured to:

obtain a positioning error (R) and lengths of closed paths that surround all unreachable regions in a positioning scenario;

determine a value range of the L as 2R<

L<

(C/2) in response to a minimum closed path length (C) being greater than 4R;

determine the value range of the L as 2R<

L<

(C₁/2) the C not being greater than 4R, wherein C₁ is a minimum closed path length greater than 4R; and

receive an L selected by a user from the value range of the L.

17. The mobile terminal according to claim 12, wherein the processor is further configured to:

determine a current positioning scenario; and

determine, according to a preset correspondence between a positioning scenario and an L, the L corresponding to the current positioning scenario.

18. The mobile terminal according to claim 12, wherein the processor is further configured to:

adjust the positioning frequency according to the L and the v in response to the v not being equal to 0; and

adjust the positioning frequency to 0 in response to the v being equal to 0.

19. The mobile terminal according to claim 12, wherein before obtaining the v, the processor is further configured to trigger a positioning operation to determine a first position of the mobile terminal.

20. The mobile terminal according to claim 12, wherein the processor is further configured to adjust the positioning frequency to a preset fixed positioning frequency when the v cannot be obtained.