RTLS SYSTEM USING TDO

• US 20120293373A1
• Filed: 05/07/2012
• Published: 11/22/2012
• Est. Priority Date: 05/16/2011
• Status: Abandoned Application

• Current Assignee: LSIS Co. Ltd. (LS Corporation)
• Original Assignee: LSIS Co. Ltd. (LS Corporation)
• Inventors: YOU, Chang Sung
• Application Number:
  US13/465,908
• Publication Number:
  US 20120293373A1
• Time in Patent Office: Days
• US Class Current: 342/465
• CPC Class Codes: G01S 5/021 Calibration, monitoring or correction G01S5/0252 takes precedence
• CPC Class Codes: G01S 5/06 Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements G01S5/12 takes precedence

Abstract

Provided is an RTLS system using TDOA, the RTLS system tracking, by a positioning unit, a position of a transmitter based on a position signal transmitted by the transmitter, the system comprising a plurality of receivers receiving the position signal from the transmitter, and a gateway calculating a time difference of position signal arriving at the plurality of receivers from the transmitter and providing the time difference to the positioning unit.

Claims

1. An RTLS system tracking, by a positioning unit, a position of a transmitter based on a position signal transmitted by the transmitter, the system comprising:

a plurality of receivers receiving the position signal from the transmitter; and

a gateway calculating a time difference of position signal arriving at the plurality of receivers from the transmitter and providing the time difference to the positioning unit.

2. The system of claim 1, wherein the position signal transmitted from the transmitter includes a position signal of RF band (RF position signal).

3. The system of claim 2, wherein the receiver comprises an antenna receiving the RF position signal transmitted by the transmitter, and a converter converting the RF position signal to a position signal of IF frequency band (IF position signal).

4. The system of claim 1, wherein the gateway comprises a plurality of modems receiving each position signal from the plurality of receivers;

a clock unit providing clocks; and

a measurement unit measuring a TDOA using a reception time of the position signal in the plurality of modems based on the clock provided by the clock unit.

5. The system of claim 4, wherein the TDOA includes a difference between an arrival time of position signal at the receiver and a transmission time of position signal at the transmitter.

6. The system of claim 4, wherein the plurality of receivers and the plurality of modems are wiredly connected.

7. The system of claim 4, wherein the plurality of receivers and the plurality of modems are connected via a predetermined cable.

8. The system of claim 7, wherein the TDOA includes a difference of reception time of position signal at modem and delay time predetermined by the signal transmission characteristic of the cable.

9. The system of claim 4, wherein the gateway further comprises a signal processor decoding the position signal received by the plurality of modems.

10. The system of claim 1, wherein the transmitter and the plurality of receivers form a positioning group, and the plurality of receivers in the positioning group receive the position signal transmitted by the transmitter in the positioning group.