Method, apparatus, and terminal for obtaining route

Patent metadata

Field	Value
Publication number	US-11237001-B2
Application number	US-201716490827-A
Country	US
Kind code	B2
Filing date	May 23, 2017
Priority date	Mar 3, 2017
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A method, apparatus, and terminal for obtaining a route are provided, including techniques and related apparatus for: obtaining, by a terminal, a first moment at which a signal in the terminal disappears and first location information of the terminal at the first moment, and performing dead reckoning starting from the first moment; obtaining, by the terminal, a second moment at which a user sends a distress signal and second location information of the terminal at the second moment, and ending the dead reckoning, to obtain a first dead reckoning curve; and determining, by the terminal, a track of a traveled route based on the first moment, the second moment, the second location information, the first dead reckoning curve, and each moment between the first moment and the second moment.

First claim

What is claimed is:

1. A method for obtaining a route, comprising:
detecting, by an electronic device, a signal strength;
obtaining, by the electronic device, a third moment when the signal strength is greater than or equal to a first threshold and less than a second threshold at least M consecutive times;
recording, by the electronic device, a sensor parameter without performing dead reckoning;
continuously detecting, by an electronic device, the signal strength;
obtaining, by the electronic device, a first moment and a first location of the electronic device at the first moment when the signal strength is less than the first threshold at least N consecutive times;
performing, by the electronic device, dead reckoning starting from the first moment;
obtaining, by the electronic device, a second moment at which the electronic device receiving a distress signal and a second location of the electronic device at the second moment;
obtaining, by the electronic device, a first dead reckoning curve from the first moment to the second moment;
determining, by the electronic device, a first track of a traveled route based on the first moment, the second moment, the second location information, and the first dead reckoning curve; and
navigating, by the electronic device, from the second location to the first location based on the first track of a traveled route.

2. The method of claim 1 , wherein if coordinate values of a user at a moment T in the track of the traveled route are (X T , Y T ),

X
T

=

X
T
′

+

(

X

2
⁢
end

-

X

1
⁢
end

)

*

T
-

T
start

T
end

-

T
start

;
and

Y
T

=

Y
T
′

+

(

Y

2
⁢
end

-

Y

1
⁢
end

)

*

T
-

T
start

T
end

-

T
start

,

wherein
X T is an X-axis coordinate value of the user at the moment T in the traveled route; X T ′ is an X-axis coordinate value of the user at the moment T in the first dead reckoning curve; X 2end is an X-axis coordinate value in the second location information; X 1end is an X-axis coordinate value of the user at the second moment in the first dead reckoning curve; T start is the first moment; and T end is the second moment; and
Y T is a Y-axis coordinate value of the user at the moment T in the traveled route; Y T ′ is a Y-axis coordinate value of the user at the moment T in the first dead reckoning curve; Y 2end is a Y-axis coordinate value in the second location information; and Y 1end is a Y-axis coordinate value of the user at the second moment in the first dead reckoning curve.

3. The method of claim 1 , wherein the sensor parameter comprises at least one of an acceleration value, a displacement direction, an angular velocity value, or a magnetic field direction.

4. The method of claim 1 , wherein each of the first location and the second location is obtained by using a satellite positioning system.

5. The method of claim 4 , further comprising:
after obtaining each of the first location and the second location by using the satellite positioning system, disabling, by the electronic device, the satellite positioning system.

6. The method of claim 1 , further comprising:
performing, by the electronic device, reverse dead reckoning from the first moment to the third moment to obtain a second dead reckoning curve.

7. The method of claim 6 , further comprising:
navigating, by the electronic device, from the third location to the first location based on the second dead reckoning curve.

8. An electronic device, comprising:
at least one processor; and
a memory coupled to the at least one processor and configured to store programming instructions that, when executed by the at least one processor, cause the electronic device to:
detect a signal strength;
obtain a third moment when the signal strength is greater than or equal to a first threshold and less than a second threshold at least M consecutive times;
record a sensor parameter without performing dead reckoning;
continuously detect the signal strength;
obtain a first moment and a first location of the electronic device at the first moment when the signal strength is less than the first threshold at least N consecutive times;
perform dead reckoning starting from the first moment;
obtain a second moment at which the electronic device receiving a distress signal and a second location of the electronic device at the second moment;
obtain a first dead reckoning curve from the first moment to the second moment;
determine a first track of a traveled route based on the first moment, the second moment, the second location information, and the first dead reckoning curve; and
navigate from

Assignees

• Huawei Tech Co Ltd

Inventors

• Li Guoliang

Classifications

• G01C21/1654

  with electromagnetic compass · CPC title

• G01C21/12 Primary

  executed aboard the object being navigated; Dead reckoning · CPC title

• G01C21/3484

  Personalized, e.g. from learned user behaviour or user-defined profiles · CPC title

• G01C21/3492

  employing speed data or traffic data, e.g. real-time or historical (traffic control systems for road vehicles involving transmission of navigation instructions to the vehicle G08G1/0968) · CPC title

• G01S19/49

  whereby the further system is an inertial position system, e.g. loosely-coupled · CPC title