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Positioning method based on multi-antenna orthogonal frequency division multiplexing (OFDM) modulated signal

A positioning method and orthogonal frequency division technology, which can be used in positioning, radio wave measurement systems, measuring devices, etc., and can solve the problem that the positioning method cannot achieve three-dimensional positioning.

Active Publication Date: 2017-10-20
江苏先安科技有限公司
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Problems solved by technology

However, this method is limited to two-dimensional plane positioning
[0005] Therefore, the problem existing in the existing technology is: when the number of coherent signal sources is more than the number of antennas, the positioning method based on multi-antenna OFDM modulation signals cannot realize three-dimensional positioning

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  • Positioning method based on multi-antenna orthogonal frequency division multiplexing (OFDM) modulated signal
  • Positioning method based on multi-antenna orthogonal frequency division multiplexing (OFDM) modulated signal
  • Positioning method based on multi-antenna orthogonal frequency division multiplexing (OFDM) modulated signal

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Embodiment Construction

[0022] Such as figure 1 As shown, a positioning method based on a multi-antenna OFDM modulation signal of the present invention is characterized in that it comprises the following steps:

[0023] (10) digital signal acquisition: obtain the digital signal of OFDM modulation from the multi-antenna array of circular arrangement; The multi-antenna array of described circular arrangement is:

[0024] The multi-antenna array arranged in a circular shape is a plurality of antennas evenly arranged on the circumference of a geometric circle: N antennas form a uniform circular arrangement, and the distance between each antenna is 2π / N radians. Such as figure 2 As shown, suppose L unknown OFDM signal sources are in the far field with The angle is incident on the circular array, θ is the angle between the signal and the x-axis, is the angle between the signal and the z-axis, with the center of the circle as the reference, then the array response vector of the lth unknown signal sour...

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Abstract

The invention discloses a positioning method based on a multi-antenna orthogonal frequency division multiplexing (OFDM) modulated signal. The method comprises the following steps of: (10) digital signal acquisition: acquiring an OFDM modulated digital signal from a circular multi-antenna array; (20) system reconfiguration: decomposing a direction vector from subcarrier channel state information to expand an aperture; (30) subcarrier virtual smoothing: obtaining sub-arrays and the covariance of sub-array channel state information according to an invariant sub-array flow pattern principle; (40) incident angle time estimation: obtaining the incident angle and the incident time of an unknown signal according to the arithmetical mean value of the covariance of respective sub-arrays; (50) triangular positioning: enabling the direction angle estimated by multiple anchor nodes to perform cross-positioning, selecting the arrival angle of a signal with the minimum arrival time as a direction angle, and selecting any point in a graphic formed by the intersection points as a final positioning coordinate point. The positioning method can achieve high-precision three-dimensional positioning of multiple signal sources with fewer antennas.

Description

technical field [0001] The invention belongs to the technical field of radio positioning, in particular to a positioning method based on multi-antenna orthogonal frequency division multiplexing modulation signals. Background technique [0002] Location information has become the key basic information of modern society and plays an important role in national economy, national defense technology and daily life. The satellite-based positioning and positioning system represented by GPS has enabled many applications to obtain convenient and fast location services. Orthogonal Frequency Division Multiplexing (OFDM) has been adopted by many wireless communication standards, including 3GPP LTE, DVB-T, and IEEE 802.11agn / ac, so using the existing OFDM system for positioning is a compatible method. [0003] Positioning techniques are generally divided into two categories: ranging-based positioning and non-ranging positioning. Non-ranging positioning relies on connection information b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/10
CPCG01S5/10
Inventor 陈隆亮齐望东庄昱垚赵统一
Owner 江苏先安科技有限公司
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