System and method for estimating indoor location using satellite signal generation device

Abstract

The present invention relates to a system and a method for estimating a location for freely providing location estimation service to a user owning a satellite signal receiving terminal, such as an existing mobile phone or a navigator, without having to change any hardware or software, even in shadow areas where satellite signals cannot reach easily, such as inside buildings, underground commercial quarters, tunnels, and subways. The system for estimating an indoor location of using a satellite signal generation device of the present invention comprises: a reception antenna for receiving satellite signals; a central control device for calculating and renewing real-time satellite information of all existing satellites, for extracting and synchronizing satellite time from the satellite signal which is received from the reception antenna, and selecting at least four satellite numbers that can be used for estimating the location from the all existing satellites, based on the satellite time information; and at least one satellite signal generation device for being allocated the satellite number from the central control device and generating the satellite signal which corresponds to the allocated satellite number, wherein an environment is provided for a user of an indoors satellite signal receiving terminal to estimate the location of oneself, based on the satellite signal that corresponds to the at least four satellite numbers, which are transmitted from the satellite signal generation device.

Description

technical field [0001] The present invention relates to an indoor position measurement system and its method using a satellite signal generating device, more specifically, to a shadow area where satellite signals are difficult to reach inside buildings, underground shopping malls, tunnels and subways, etc. A position measurement system and method thereof that can freely provide position measurement services to users who have satellite signal receiving terminals such as mobile phones or navigators without changing any hardware or software. Background technique [0002] Generally, the position measurement system measures the position of the receiving terminal by triangulation after receiving satellite signals from satellites 19,000 to 25,000 km above the ground. [0003] At the same time, the location measurement system has the limitation that it can only measure the location from the outdoors that directly receive satellite signals, and indoors such as buildings, underground ...

AI Technical Summary

Problems solved by technology

[0006] First, even if the retransmission signal is received by the transmitting antenna (TX ANT), it is considered the coordinates of the receiving antenna (RX ANT), so there is a serious vertical error problem, and the interval between the installation of the receiving antenna becomes a horizontal error problem

In order to improve the horizontal error, multiple receiving antennas (RX ANT) are required, so it is difficult to increase the manufacturing and installation costs

[0007] Second, the location of the receiving antenna installed outdoors and the location of the corresponding indoor transmitting antenna (TX ANT) must be correctly matched. Due to the topography of the roof, it is actually very difficult to correctly install multiple receiving antennas on the roof

[0008] Third, if figure 1 The dotted lines shown have different loss rates according to the lead-in distance of each cable, so the electric field strength of each antenna terminal must be adjusted during installation

[0009] Fourth, depending on the installation position of the receiving antenna, there is a problem of receiving different coordinate values

This problem has a large impact on the vertical error rate

[0010] Fifth, the RF power (RF Power) between the transmitting antennas is not adjusted correctly, and the terminal continues to receive signals from the transmitting antenna with high RF power

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