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A method and apparatus for tracking position

A kind of equipment and technology for determining the position, which is applied in the directions of positioning, measuring devices, and utilizing re-radiation, and can solve problems such as expensive equipment and difficult logistics

Inactive Publication Date: 2009-05-06
COMMONWEALTH SCI & IND RES ORG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such systems must strictly limit the radiated RF power to avoid interference with other radio systems, so the range of UMB position positioning systems is usually limited to about 10 meters
Such systems require a large number of base stations to cover typically indoor areas, thus making equipment expensive and logistically difficult
equipment also requires expensive radios to generate and receive wideband signals

Method used

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  • A method and apparatus for tracking position
  • A method and apparatus for tracking position
  • A method and apparatus for tracking position

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Embodiment Construction

[0032] Before describing the preferred embodiment, the requirements for accurate time-of-arrival (TOA) estimation and signal bandwidth are studied further.

[0033] As previously discussed, if the signal bandwidth is sufficient to resolve every signal in a multipath environment, TOA estimation can be based on the arrival of the first significant signal without being negatively affected by other scattered signals. In the case of an indoor non-line-of-sight environment, the scattered signal delay is typically 1 meter or more (equivalent to about 3 nanoseconds), thus making the required bandwidth for resolving the multipath signal 300MHz or larger (see figure 1 , where an example of TOA pulse measurements using a 3 GHz bandwidth (or approximately 0.3 ns resolution) is shown). It was observed that the arrival time is determined by the first significant signal above the background noise, and that delaying the signal does not affect the measurement in cases where the delay of othe...

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Abstract

The present invention relates to a method and apparatus for tracking position of an object in a multipath environment (for example, inside a building) using radio signals. In order to provide an accurate Time of Arrival (TOA) estimate in a multipath environment, a wide bandwidth signal (providing a sharp rise time pulse) is required. Only a limited bandwidth is available in the radio spectrum, however. Further, installations for position tracking which generate wide bandwidth signals require expensive and complex radios. In the present invention, a number of narrow bandwidth signals are generated by a transmitter and combined together at a receiver to provide an effective wideband position location signal. Only relatively narrow bandwidth signals have to be transmitted, therefore, but accurate position can still be determined. Further, transmission of narrow bandwidth signals enables the use of relatively inexpensive radio transmitters.

Description

technical field [0001] The present invention relates to methods and apparatus for tracking the position of objects, and more particularly but not exclusively, to methods and apparatus for processing signals providing time-of-arrival information to enable tracking of the position of objects. Background technique [0002] Radiolocation is the field of technology that uses radio signals to determine the location of devices. This technique has a wide range, from short ranges (a few meters) to very long ranges in relation to the navigation of the aircraft. The most well-known system of late is the Global Positioning System (GPS) of the United States, which provides an accuracy of the order of a few meters (or better) anywhere on the Earth's surface when there is a line-of-sight propagation to the associated satellites. However, position positioning indoors or in urban environments is poorly developed, mainly due to difficult radio propagation conditions. Virtually all radio-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/14G01S5/02H04J99/00
CPCG01C21/206G01S1/20G01S5/0215G01S5/14G01S5/0226G01S1/042G01S11/08G01S1/0423G01S1/0428G01S5/0218G01S5/02216
Inventor I·夏普
Owner COMMONWEALTH SCI & IND RES ORG
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