Positioning algorithm based on signal gain and loss of 2.5G wireless network

Abstract

The invention discloses a positioning algorithm based on signal gain and loss of a 2.5G wireless network. The algorithm comprises the following steps: calculating antenna gain and signal loss of mobile terminals and base stations during signal transmission in the 2.5G wireless network; obtaining an estimated coordinate value of a mobile terminal communicating with each base station; through the estimated coordinate values and coordinate value information of each base station communicating with the mobile terminals, obtaining an average distance estimated error through calculation; according to the antenna gain, the loss, the average distance estimated error and the density of the base stations, obtaining coordinate values of the plurality of mobile terminals through calculation; and solving a sum of the coordinate values of the plurality of mobile terminals, and then performing averaging to obtain real coordinate values of the mobile terminals so that the mobile terminals are positioned under the condition of the signal loss of the 2.5G wireless network. The algorithm provided by the invention is based on full consideration of the loss of signals in a transmission process, is more accurate in positioning, is suitable for outdoor application, and also has a quite good positioning effect in indoor application.

Description

technical field [0001] The invention specifically relates to a positioning algorithm based on the profit and loss of 2.5G wireless network signals. Background technique [0002] At present, the positioning of mobile terminals generally adopts GPS positioning technology, but because GPS positioning technology is too dependent on the performance of mobile terminals, the work of satellite scanning, capture, pseudo-range signal reception and positioning calculation is integrated into the terminal, resulting in low positioning sensitivity, Defects such as long time consumption and high power consumption of the terminal; moreover, the GPS positioning technology only works well outdoors, but the effect is poor indoors or in places where satellite signals cannot be covered, and if there are no more than 3 satellites in the sky above the location , the system cannot achieve positioning from the cold start state. [0003] In addition to GPS positioning technology, the trilateration p...

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Problems solved by technology

[0004] Aiming at the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a positioning algorithm based on the signal gain and loss of 2.5G wireless network to solve the problem of low positioning accuracy caused by antenna gain and signal loss in the 2.5G wireless network. and the problem of low positioning sensitivity

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