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Evaluation method for RSS (Received Signal Strength)/AOA (Angle of Arrival)/TDOA (Time Difference of Arrival) positioning performance under indoor WLAN (Wireless Local Area Network) environment

A technology of positioning performance and evaluation method, which is applied in the fields of electrical components, wireless communication, network topology, etc., and can solve the problem that the relationship between the observation quantity and the positioning error limit cannot be well described.

Active Publication Date: 2015-12-23
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, existing evaluation methods cannot well describe the relationship between different observations and positioning error limits in indoor WLAN environments.

Method used

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  • Evaluation method for RSS (Received Signal Strength)/AOA (Angle of Arrival)/TDOA (Time Difference of Arrival) positioning performance under indoor WLAN (Wireless Local Area Network) environment
  • Evaluation method for RSS (Received Signal Strength)/AOA (Angle of Arrival)/TDOA (Time Difference of Arrival) positioning performance under indoor WLAN (Wireless Local Area Network) environment
  • Evaluation method for RSS (Received Signal Strength)/AOA (Angle of Arrival)/TDOA (Time Difference of Arrival) positioning performance under indoor WLAN (Wireless Local Area Network) environment

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Embodiment Construction

[0076] The present invention will be further described below in conjunction with accompanying drawing.

[0077] Such as figure 1 The shown evaluation method for RSS / AOA / TDOA positioning performance under the indoor WLAN environment includes the following steps:

[0078] Step 1. Select the positioning target area.

[0079] Step 2: Determine the location of the access point AP (AccessPoint) in the positioning target area.

[0080] Step 3: Let the possible position of the i-th user in the target area be θ i =(x i ,y i ).

[0081] Step 4: Use the Fisher information matrix to calculate the three single-view measurement positioning error limits for the i-th user's possible position, that is, the AOA positioning error limit V(A) i , RSS positioning error limit V(R) i And TDOA positioning error limit V(T) i . The single-observation measurement positioning error limit indicates: in the indoor WLAN positioning process, the positioning error limit when using information of one o...

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Abstract

The invention discloses an evaluation method for RSS (Received Signal Strength) / AOA (Angle of Arrival) / TDOA (Time Difference of Arrival) positioning performance under an indoor WLAN (Wireless Local Area Network) environment. The evaluation method comprises the following steps: firstly, making different observed quantities to be subject to the respective Gaussian distribution respectively according to a statistical property of signal distribution under the indoor WLAN environment; then using the characteristic of a Fisher information matrix to respectively calculate the error limits of individual RSS, AOA and TDOA positioning methods; secondly, using a multivariate normal distribution function to describe probability distributions of multiple observed quantities, and respectively calculating to obtain the error limits of RSS / AOA, RSS / TDOA, AOA / TDOA and AOA / TDOA / RSS mixed positioning methods; finally, quantitatively analyzing the influence of the positioning method based on different observed quantities to the error limit, and comprehensively evaluating the positioning performance of the RSS / AOA / TDOA. The evaluation method for RSS / AOA / TDOA positioning performance under the indoor WLAN environment improves the positioning precision of the indoor WLAN positioning method.

Description

technical field [0001] The invention belongs to radio communication technology, and in particular relates to an evaluation method for RSS / AOA / TDOA positioning performance in an indoor WLAN environment. Background technique [0002] With the continuous popularization of smart terminals and the increase of business requirements, users have increasingly strong demands for immediacy and locality of information, so location-based services (LBS) have also attracted much attention. At present, the more popular wireless positioning systems include GPS (Global Position System), cellular positioning system, Bluetooth positioning system, radio frequency identification RFID (Radio Frequency Identification) positioning system, ZigBee positioning system and wireless local area network WLAN (WirelessLocalAreaNetwork) positioning system. Among them, the GPS positioning system is currently the most widely used and has high positioning accuracy. However, in an environment with many obstacles,...

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Application Information

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IPC IPC(8): H04W24/08H04W64/00
CPCH04W16/22H04W24/02H04W24/08H04W64/006H04W84/12
Inventor 周牧邱枫田增山王烟濛王斌唐云霞何维杨晓波
Owner CHONGQING UNIV OF POSTS & TELECOMM
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