An Indoor Positioning Method with Unknown Signal Transmitting Power
A signal transmission, indoor positioning technology, applied in positioning, wireless communication, transmission monitoring and other directions, can solve the problem of positioning result error, affecting positioning performance, not a fixed value, etc., to achieve the effect of improving accuracy and ensuring accuracy
Active Publication Date: 2021-01-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0019] However, in practical applications, the signal transmission power is not a fixed value. The service life of the equipment and the periodic change of the alternating current will affect the signal transmission power, which will further affect the positioning performance and cause errors in the positioning results.
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[0057] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0058] figure 1 It is a schematic diagram of indoor positioning with unknown transmission power of the present invention. The processing method of the unknown signal transmission power in the present invention is to treat the signal transmission power as an implicit variable, and the signal transmission power is regarded as an obedience mean value of P t , with a variance of Gaussian variables.
[0059] Such as figure 2 As shown, an indoor positioning method with unknown signal transmission power includes the following steps:
[0060] S1. Use the grid search method to find the area position of the node to be located; the specific method is: divide the area to be located into a grid, and use the length l to divide the location area with a size of L×M into a disjoint matrix grid;
[0061] Randomly give a signal transmission power P t va...
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The present invention discloses an indoor positioning method with unknown signal transmission power and path loss, comprising the following steps: S1. Taking a received signal power node as a reference node, denoted by c, respectively comparing the received power values of other received signal power nodes with the Subtract the received power value of the reference node; S2, write the semi-positive definite programming algorithm form; S3, regard the path loss β as prior information, and regard the path loss as a random variable obeying Gaussian distribution, where the mean is μ β , the variance is the position of the positioning node under the condition of unknown path loss value obtained by the maximum a posteriori probability estimation algorithm combined with the positive semi-definite programming algorithm based on the difference in received signal strength; S4. Solve the path loss and the exact position of the node to be positioned by iterative algorithm . The present invention can effectively improve the accuracy of the node to be positioned under the condition that the indoor environment is changeable, and ensure the accuracy of positioning under unknown transmission power and path loss value changes.
Description
technical field [0001] The invention belongs to the technical field of indoor positioning, in particular to an indoor positioning method based on unknown signal transmission power based on signal receiving strength in the modern indoor positioning processing technology based on signal receiving strength. Background technique [0002] Indoor positioning technology refers to a method for obtaining coordinate information based on a certain coordinate system at a certain moment when a person or object is in a specific environment. The traditional positioning algorithm based on received signal strength is realized on the premise that the signal transmission power is known, so the positioning error will increase when the signal transmission power changes; at this time, the unknown signal transmission power based on the received signal strength The maximum expectation (Expectation Maximum EM) indoor positioning algorithm can solve the situation of signal transmission power changes ...
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IPC IPC(8): G01S5/02G01S5/06H04B17/309H04B17/318H04W64/00
CPCG01S5/0257G01S5/0278G01S5/06H04W64/006H04B17/309H04B17/318Y02D30/70
Inventor 熊文汇杨超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA