SYSTEM AND METHOD FOR SINGLE SENSOR GEOLOCATION

• US 20110230206A1
• Filed: 05/31/2011
• Published: 09/22/2011
• Est. Priority Date: 08/18/2006
• Status: Abandoned Application

• Current Assignee: Andrew LLC (CommScope Holding Company, Inc.)
• Original Assignee: Andrew LLC (CommScope Holding Company, Inc.)
• Inventors: Kennedy, Joseph P. JR., Carlson, John Peter
• Application Number:
  US13/118,898
• Publication Number:
  US 20110230206A1
• Time in Patent Office: Days
• US Class Current: 455/456.1
• CPC Class Codes: G01S 5/02521 using a radio-map
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A system and method for determining a position of a wireless mobile device. The method comprising the steps of providing one base station in communication with the mobile device, providing a sensor spaced apart a known distance from the base station, and determining the range between the mobile device and the base station. The time of arrival of a signal transmitted from the mobile device is measured at the sensor and a set of coordinates is calculated for the mobile device relative to the sensor as a function of the known distance from the sensor to the base station, the range between the mobile device and the base station, an estimate of base station transmission timing relative to a time source, and the time of arrival. One of the set of coordinates may then be chosen to thereby determine a position of the mobile device relative to the sensor.

Claims

1. In a method of locating a position of a mobile device using a sensor spaced apart a known distance from a base station in communication with the mobile device, the mobile device providing a signal transmission, the improvement comprising calculating and choosing a set of coordinates for the mobile device relative to the sensor as a function of:

the known distance from the sensor to the base station, a range between the mobile device and the base station, an estimate of base station transmission timing relative to a time source known at the sensor, and a time of arrival of the signal transmission of said mobile device at the sensor.

2. A method for determining a position of a wireless mobile device comprising the steps of:

(a) providing one base station in communication with the mobile device;

(b) providing a sensor spaced apart a known distance from the base station;

(c) determining a range between the mobile device and the base station;

(d) measuring a time of arrival at the sensor of a signal transmitted from the mobile device;

(e) calculating a set of coordinates for the mobile device relative to the sensor as a function of the known distance from the sensor to the base station, the range, an estimate of base station transmission timing relative to a time source known at the sensor, and the time of arrival of the signal transmitted from the mobile device; and

(f) choosing a one of the set of coordinates to thereby determine a position of the mobile device relative to the sensor.

3. A system for locating a position of a mobile device comprising a mobile location center in communication with a network having at least one sensor spaced apart a known distance from a base station in communication with the mobile device, the mobile device providing a signal transmission wherein the mobile location center calculates and chooses a set of coordinates for the mobile device relative to the sensor as a function of:

(i) the known distance from the sensor to the base station;

(ii) a range between the mobile device and the base station;

(iii) an estimate of base station transmission timing relative to a time source known at the sensor; and

(iv) a time of arrival of the signal transmission from the mobile device at the sensor.