Indoor positioning method and device based on TC-OFDM (Time and Code Division-Orthogonal Frequency Division Multiplexing)
A TC-OFDM and indoor positioning technology, which is applied in the field of indoor positioning based on time division code division orthogonal frequency division multiplexing, can solve the problem of long initial point positioning and positioning time, and achieve the effect of avoiding long positioning time
Active Publication Date: 2017-08-18
BEIJING UNIV OF POSTS & TELECOMM
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[0005] The purpose of the embodiments of the present invention is to provide a TC-OFDM-based indoor positioning method and device to solve the problem of long positioning time for initial point positioning in the prior art
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[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0053] Since the number of currently available spreading code sequences is 50, it is limited, and the arrangement of indoor omnidirectional ceiling antennas for transmitting positioning signals in the prior art is not regular, and positioning signals may also penetrate walls indoors Therefore, it will cause the same spreading code sequence on different floors. The receiver terminal may receive positioning signals with the same spreading code sequence from diffe...
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The embodiment of the invention provides an indoor positioning method and device based on TC-OFDM (Time and Code Division-Orthogonal Frequency Division Multiplexing). The method comprises the following steps: receiving a first positioning signal which is transmitted by a first indoor omni-directional ceiling antenna and at least four second positioning signals which are transmitted by at least four second indoor omni-directional ceiling antennas by a receiver terminal, wherein the first positioning signal comprises a special spread spectrum code sequence; each of the second positioning signals comprises a non-special spread spectrum code sequence; and the combination of the special spread spectrum code sequence and the non-special spread spectrum code sequences is used for identifying floors and floor areas; and inquiring a spatial position corresponding to the special spread spectrum code sequence and the at least four non-special spread spectrum code sequences in a pre-stored spatial position coded information table, and determining the spatial position as a current initial point position of the receiver terminal, wherein the spatial position coded information table comprises a corresponding relationship between the special spread spectrum code sequence and the floor areas and a corresponding relationship between a non-special spread spectrum code sequence group and the number of floors; and the non-special spread spectrum code sequence group comprises at least four non-special spread spectrum code sequences.
Description
technical field [0001] The present invention relates to the technical field of indoor positioning, in particular to an indoor positioning method and device based on Time & Code Division-Orthogonal Frequency Division Multiplexing (TC-OFDM). Background technique [0002] The indoor positioning system based on TC-OFDM is a high-precision positioning system, which adopts the integrated signal system of navigation and communication, based on the mobile communication network, and combined with the Beidou navigation system, to achieve high-precision positioning with seamless connection between indoor and outdoor areas. The indoor horizontal positioning accuracy can reach 3 meters, and the vertical positioning accuracy can reach 1 meter. Therefore, the TC-OFDM indoor positioning system has the advantages of high positioning accuracy, seamless connection with outdoor satellite positioning, and easy promotion. [0003] In the TC-OFDM indoor positioning system, the indoor omnidirection...
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IPC IPC(8): H04B1/69H04W4/02H04W4/04
CPCH04B1/69H04W4/023
Inventor 邓中亮杨寅徐福海莫君贾步云肖占蒙
Owner BEIJING UNIV OF POSTS & TELECOMM