Indoor Transmitter for Positioning Without Satellite Clock Sync
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Solution Overview
Problem
Conventional satellite-based positioning systems, such as GPS, face challenges in providing accurate position information in urban areas or indoor locations due to signal obstruction and the need for clock synchronization, leading to increased costs and complexity.
Innovation Solution
A position information providing system using indoor transmitters that emit spread spectrum signals, allowing for position determination without satellite signal reception, with no requirement for clock synchronization with satellite clocks, and facilitating installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite-based positioning systems are used in urban areas or indoor locations, then position information can be provided, but signal obstruction from buildings and structures causes deterioration in measurement accuracy
Solution Approach 1:
The patent introduces indoor transmitters as intermediary devices that receive satellite signals outdoors and re-transmit them indoors. These transmitters act as mediators between the satellite-based positioning system and indoor receivers, enabling position determination in locations where direct satellite signal reception is blocked by buildings and structures.
2Area of stationary object
If conventional indoor transmitters are deployed to cover wide areas, then position information can be provided indoors, but an extremely large number of transmitters are required
Solution Approach 1:
The patent makes transmitters universal by enabling them to function both as satellite signal receivers and as position information broadcasters. Each transmitter is equipped with satellite signal receiving units that allow it to operate autonomously without requiring other transmitters for synchronization, thereby reducing the total number of transmitters needed to cover wide areas.
Solution Approach 2:
The patent performs preliminary action by pre-synchronizing transmitter operations through satellite signal reception before indoor deployment. The transmitters use received satellite signals to establish timing and coordination in advance, eliminating the need for complex post-deployment synchronization networks and reducing the overall system complexity.
3Reliability
If transmitter output is limited to avoid interference, then signal interference is reduced, but receivable range for position information is restricted
Solution Approach 1:
The patent segments the coverage area by deploying multiple transmitters throughout the target region, each operating at limited output power to avoid interference. By dividing the overall coverage into multiple smaller zones handled by individual transmitters, the system maintains reliable interference control while collectively achieving wide area coverage through the combined effort of distributed transmitters.
Data Source
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AI summary
It is intended to provide position information in a location where it is difficult for radio waves to penetrate. An indoor transmitter is capable of programmably changing a format of a transmitter signal. A process to be performed by a position information providing apparatus comprises the step (S610) of acquiring a received positioning signal, and the step (S612) of identifying an emission source of the positioning signal, wherein, if the emission source of the positioning signal is an outdoor source, the process further comprises the step (S622) of acquiring a navigation message included in the positioning signal, and the step (S624) of performing a processing for calculating a position based on the signal, or, if the emission source of the positioning signal is an indoor source, the process further comprises the step (S632) of acquiring message data from the positioning signal, the step (S634) of acquiring coordinate values from the data, and the step (S650) of displaying position information based on the coordinate values.