Positioning method and terminal

• US 10,459,088 B2
• Filed: 05/10/2016
• Issued: 10/29/2019
• Est. Priority Date: 05/13/2015
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Yamazaki, Yasuhisa
• Primary Examiner(s): Gregory, Bernarr E
• Assistant Examiner(s): Mull, Fred H
• Application Number:
  US15/524,850
• Publication Number:
  US 20180052238A1
• Time in Patent Office: 1,267 Days
• CPC Class Codes: G01S 19/43 using carrier phase measurements, e.g. kinematic positioning; using long or short baseline interferometry
• CPC Class Codes: G01S 19/44 Carrier phase ambiguity resolution; Floating ambiguity; LAMBDA [Least-squares AMBiguity Decorrelation Adjustment] method
• CPC Class Codes: G01S 19/50 whereby the position solution is constrained to lie upon a particular curve or surface, e.g. for locomotives on railway tracks

Abstract

In a positioning method and a terminal according to the present disclosure, a processor positions a location of the terminal through interferometric positioning using a plurality of positioning signals received from a plurality of satellites. The processor calculates an integer bias for the plurality of positioning signals, selects a group of location candidates based on a float solution acquired through the calculation of the integer bias, and notifies that the terminal is located at a predetermined point on a map under a condition in which the group of location candidates is included in a line-shaped area.

Claims

1. A notifying method, comprising:

causing a processor to calculate an integer bias for a plurality of positioning signals received from satellites;

causing the processor to select a location candidate group that is acquired through the calculation of the integer bias, based on a float solution, the location candidate group indicating candidates of a location of a terminal; and

causing the processor to notify that the terminal is located at a predetermined point on a map, under a condition in which the location candidate group is included in a line-shaped area and the solution indicating the location of the terminal has not been acquired based on the calculated integer bias.

2. The notifying method of claim 1, further comprising:

causing the processor to calculate an estimated coordinate of the location of the terminal; and

causing the processor to define the line-shaped area based on the calculated estimated coordinate.

3. The notifying method of claim 1, further comprising:

causing the processor to calculate a movement direction of the terminal; and

causing the processor to define the line-shaped area based on the calculated movement direction.

4. The notifying method of claim 1, further comprising:

causing the processor to define the line-shaped area by using information acquired from a geographic database.

5. The notifying method of claim 1,

wherein the processor selects the location candidate group, from among location candidates acquired through the calculation of the integer bias, based on a likelihood about whether a candidate of location indicated by the location candidate is a true location of the terminal.

6. A terminal, comprising:

a processor; and

a storage,

wherein the processor is configured to perform operations, including

calculating an integer bias for a plurality of positioning signals received from satellites,

selecting a location candidate group that is acquired through the calculation of the integer bias, based on a float solution, the location candidate group indicating candidates of a location of a terminal and

notifying that the terminal is located at a predetermined point on a map, under a condition in which the location candidate group is included in a line-shaped area and the solution indicating the location of the terminal has not been acquired based on the calculated integer bias.

7. The terminal of claim 6,

wherein the operations performed by the processor further include calculating an estimated coordinate of the location of the terminal, and

defining the line-shaped area based on the calculated estimated coordinate.

8. The terminal of claim 6,

wherein the operations performed by the processor further include calculating a movement direction of the terminal, and

defining the line-shaped area based on the calculated movement direction.

9. The terminal of claim 6,

wherein the operations performed by the processor further include defining the line-shaped area by using information acquired from a geographic database.

10. The terminal of claim 6,

wherein the operations performed by the processor further include selecting the location candidate group, from among location candidates acquired through the calculation of the integer bias, based on a likelihood about whether a candidate of location indicated by the location candidate is a true location of the terminal.