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Position measuring device using multi-path delay component and the method

A multipath delay and delay estimation technology, applied in the field of determining the position of a mobile station with high precision and multipath delay components, can solve the problems of difficult application of mobile communication channels and inability to achieve optimization, and achieve high-precision position measurement Effect

Inactive Publication Date: 2009-10-07
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these documents, the position calculation can only finally be done according to the leading wave
In addition, in Non-Patent Document 1, although a ray-tracing model is constructed, this ray-tracing model is difficult to apply to mobile communication channels, and cannot achieve optimal

Method used

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  • Position measuring device using multi-path delay component and the method
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  • Position measuring device using multi-path delay component and the method

Examples

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no. 1 Embodiment approach

[0054] figure 1 It is a schematic block diagram of the position measuring device according to the first embodiment of the present invention. In the first embodiment, the position measurement method of the present invention is applied to a synchronous system. The position measuring device 10 includes: multipath delay detection sections 11-1 to 11-B that detect multipath delay wave components from a plurality of received signals, and select a plurality of delay waves that satisfy a predetermined condition from among the detected multipath delay waves. The wave selection unit 13, the storage unit 15 storing the NLOS delay function obtained in advance, and the position calculation unit 17 determine the position of the mobile station based on the delay wave selected by the selection unit and the NLOS delay function read from the storage unit 15. The NLOS delay function is a function representing the probability density of the delay path length of the NLOS (Non-line-of-sight: outsi...

no. 2 Embodiment approach

[0094] Next, refer to Figure 6 and Figure 7 , the method of position measurement according to the second embodiment of the present invention will be described. In the second embodiment, the position measurement technology of the present invention is used in an asynchronous system. Figure 6 is a schematic block diagram of the position measuring device 50 of the second embodiment, Figure 7 is a flowchart showing the operation of the position measuring device 50 .

[0095] The position measurement device 50 includes: multipath delay detection sections 51-1 to 51-B that detect multipath delay wave components from a plurality of received signals, and select a plurality of delay waves that satisfy a predetermined condition from the detected multipath delay waves. Wave selection section 53, TDOA data generation section 54 for generating TDOA (time-difference-of-arrival: time difference of arrival) data based on the selected delay wave, storage section 55 for storing NLOS delay...

no. 3 Embodiment approach

[0115] Next, refer to Figure 8 ~ Figure 10 A position measuring device and method according to a third embodiment of the present invention will be described. In the first and second embodiments described above, the position of the mobile station is estimated based on effective multipath components included in signals from the mobile station received by a plurality of base stations. In this case, it is predicated that a sufficient number of base stations exist for position estimation.

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Abstract

The present invention provides a position measurement device and a measurement method for improving the positioning accuracy in a mobile communication system by using multipath delayed wave components constituting a received signal. This position measuring device has: a multipath delay detecting unit for each of a plurality of received signals, which detects a multipath delayed wave component constituting the received signal; a plurality of delay waves of a predetermined standard; a storage unit that stores an NLOS delay function obtained in advance with respect to an out-of-sight path; a position calculation unit that reads the delay wave from the storage unit based on the delay wave selected by the selection unit. The NLOS delay function is used to determine the position of the mobile station.

Description

technical field [0001] The present invention relates to a positioning device and a positioning method for estimating the current location of a mobile station using wireless signals, and more particularly to determining the location of a mobile station with high precision using multipath delay components of wireless signals transmitted and received between a mobile station and a plurality of base stations. The method of the position of the station. technical background [0002] In a multipath environment, the same signal at the sending point reaches the receiving station at the receiving point through various paths due to reflections from buildings such as high-rise buildings and diffraction at corners of obstacles, etc. Therefore, a received signal includes a direct wave connecting the shortest distance by a straight line and a delayed wave arriving slightly later than the direct wave. Since the antennas can be directly seen, the communication that can realize the direct wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W40/20G01S5/10H04B7/26
Inventor 齐一鸿须田博人浅井孝浩
Owner NTT DOCOMO INC