Indoor positioning method of unknown signal transmitting power
A technology for signal transmission and indoor positioning, which is applied to location-based services, wireless communications, and services based on specific environments. It can solve the problems of positioning result errors, affecting positioning performance, and not being a fixed value, so as to improve accuracy, The effect of ensuring accuracy
Active Publication Date: 2018-11-23
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 invention discloses an indoor positioning method of unknown signal transmitting power. The method comprises the following steps: S1, finding a region location of a to-be-positioned node by using agrid searching method; S2, finding a specific location of the to-be-positioned node by using the expectation maximum algorithm, and comprising the following sub-steps: S21, computing condition probability expectation; S22, maximizing L (theta, theta j), and obtaining a new thetaj+1: as shown in description; S23, judging whether the thetaj+1 in the step S22 is convergent, and ending the algorithmif the thetaj+1 is convergent; or enabling thetaj to equal to thetaj+1, and returning to step S21. The transmitting power is used as the hidden variable, the condition that the to-be-positioned node is the overall optimal node when the transmitting power is changed according to the convergence of the expectation maximum algorithm, the precision of the to-be-positioned node can be effectively improved, and the accuracy of the positioning under the changed transmitting power is guaranteed.
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): H04W4/021H04W4/33H04W64/00
CPCH04W4/021H04W4/33H04W64/006
Inventor 熊文汇杨超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA