Positioning Method Based on Multi-antenna Orthogonal Frequency Division Multiplexing Modulated Signal
A technology of orthogonal frequency division and positioning method, applied in positioning, radio wave measurement system, instrument, etc., can solve the problem that the positioning method cannot realize three-dimensional positioning
Active Publication Date: 2021-01-26
江苏先安科技有限公司
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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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[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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The present invention discloses a positioning method based on multi-antenna OFDM modulated signals, which includes the following steps: (10) digital signal acquisition: acquiring a digital signal modulated by OFDM from a circular multi-antenna array; 20) System reconstruction: decompose the direction vector from the channel state information of the subcarriers, and expand the aperture; (30) Virtual smoothing of the subcarriers: according to the principle of the invariable subarray flow pattern, the subarrays and the channel state information of each subarray are obtained. Covariance; (40) Incident angle time estimation: According to the arithmetic mean of the covariance of each sub-array, the incident angle and incident time of the unknown signal are obtained; (50) Triangular positioning: The direction angle estimated by multiple anchor nodes is cross-located, The arrival angle of the signal with the minimum arrival time is selected as the direction angle, and any point in the graph formed by the intersection point is selected as the final coordinate point of the positioning. The positioning method of the present invention can realize 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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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