Mixed indoor positioning method based on signal subspace fingerprint database
A technology of signal subspace and positioning method, which is applied in the field of hybrid indoor positioning based on signal subspace fingerprint database, can solve the problem of no discovery and disclosure, and achieve the purpose of suppressing useless interference and noise, improving accuracy, and combating time-varying channels. Effect
Active Publication Date: 2017-07-11
NANJING UNIV OF POSTS & TELECOMM
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[0028] The present invention is described in further detail now in conjunction with accompanying drawing.
[0029] Such as figure 1 As shown, the present invention provides the indoor floor plan and signal information sampling points when the user is walking, including received signal strength and signal subspace information, where AP 1 , AP 2 ,...,AP L For the router access point, that is, to set up the base station, (x i ,y j ), i=1,...,m, y=1,...,n are the reference point coordinates when collecting information, that is, the location where the mobile terminal collects information, and establish the received signal strength fingerprint database and Signal subspace fingerprint library;
[0030] Such as figure 2 As shown, the determination method of the present invention comprises the following main steps:
[0031] Step (1): In the offline stage, measure the received signal strength, according to the coordinates of each area (x i ,y j ), i=1,...,m, y=1,...,n, the corre...
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The invention discloses a mixed indoor positioning method based on a signal subspace fingerprint database; the method comprises an offline phase and a positioning phase; the offline phase comprises the following steps: using an array antenna to receive signals, obtaining received signal intensity, and building a received signal intensity fingerprint database; calculating received array signals, obtaining signal subspace data, and building a signal subspace fingerprint database. The positioning phase comprises the following steps: matching online obtained data with the fingerprint database, considering offline coordinate probability distribution, using the Bayes theory to fuse information, and finally obtaining the accurate positioning coordinates. The method uses the array antenna technology which represents the future mobile terminal key technology; the fingerprint database built after array signal processing contains incident signal intensity and arrival angle information, thus more effectively confronting channel time varying influences caused by anti-multipath propagation and environment changes, effectively improving indoor positioning accuracy, and reducing positioning errors.
Description
technical field [0001] The invention belongs to the fields of signal processing, information fusion and indoor positioning, and in particular relates to a mixed indoor positioning method based on a signal subspace fingerprint library. Background technique [0002] Indoor positioning technology refers to the realization of precise positioning in the indoor environment. It mainly adopts a set of indoor positioning system composed of wireless communication, base station positioning and other technologies to realize the location service of people and objects in indoor space. Common positioning technologies include positioning technologies based on Wi-Fi, Bluetooth, infrared, ultra-wideband, RFID, ZigBee and ultrasonic. [0003] The fingerprint library positioning technology can effectively fight against indoor multipath propagation, and can greatly improve the indoor positioning accuracy. At present, typical indoor fingerprint database positioning methods can be roughly divided...
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Login to View More IPC IPC(8): H04W64/00H04W4/02H04B17/318
CPCH04B17/318H04W4/025H04W64/00H04W64/006
Inventor 王韦刚王文锐张雪黄海波
Owner NANJING UNIV OF POSTS & TELECOMM