CA2467403A1 - A position determination method for use with analog cellular system - Google Patents
A position determination method for use with analog cellular system Download PDFInfo
- Publication number
- CA2467403A1 CA2467403A1 CA002467403A CA2467403A CA2467403A1 CA 2467403 A1 CA2467403 A1 CA 2467403A1 CA 002467403 A CA002467403 A CA 002467403A CA 2467403 A CA2467403 A CA 2467403A CA 2467403 A1 CA2467403 A1 CA 2467403A1
- Authority
- CA
- Canada
- Prior art keywords
- base station
- mobile unit
- mobile
- phase
- station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001413 cellular effect Effects 0.000 title abstract 2
- 230000001360 synchronised effect Effects 0.000 abstract 2
Landscapes
- Mobile Radio Communication Systems (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
A method for determining the location of a mobile unit within a cellular system. A synchronized signal at a common phase is generated at each base station in a system.
The mobile unit transmits a signal tone. Each base station compares the phase of the signal tone to the common phase of the synchronized signal to produce a phase offset. A system controller compares the difference between the phase offset of a first base station and the phase offset of a second base station and determines the difference in distance between the first base station and the mobile unit and the second base station and the mobile unit defining a hyperbolic curve of locations. The system controller determines the intersection of the first and second hyperbolic curves thus determining the location of the mobile unit. The mobile station transmits the signal tone on a second channel that is distinct from a first channel over which user information is transmitted. The mobile station switches to the second channel in response to a request by a base station to the mobile station.
The mobile unit transmits a signal tone. Each base station compares the phase of the signal tone to the common phase of the synchronized signal to produce a phase offset. A system controller compares the difference between the phase offset of a first base station and the phase offset of a second base station and determines the difference in distance between the first base station and the mobile unit and the second base station and the mobile unit defining a hyperbolic curve of locations. The system controller determines the intersection of the first and second hyperbolic curves thus determining the location of the mobile unit. The mobile station transmits the signal tone on a second channel that is distinct from a first channel over which user information is transmitted. The mobile station switches to the second channel in response to a request by a base station to the mobile station.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US21819794A | 1994-03-25 | 1994-03-25 | |
| US218,197 | 1994-03-25 | ||
| CA002186378A CA2186378C (en) | 1994-03-25 | 1995-03-24 | A position determination method for use with analog cellular system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002186378A Division CA2186378C (en) | 1994-03-25 | 1995-03-24 | A position determination method for use with analog cellular system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2467403A1 true CA2467403A1 (en) | 1995-10-05 |
| CA2467403C CA2467403C (en) | 2007-07-03 |
Family
ID=32683210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002467403A Expired - Fee Related CA2467403C (en) | 1994-03-25 | 1995-03-24 | A position determination method for use with analog cellular system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2467403C (en) |
-
1995
- 1995-03-24 CA CA002467403A patent/CA2467403C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2467403C (en) | 2007-07-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |