Abstract
The pseudolite system is a good alternative for indoor positioning systems due to its large coverage area and accurate positioning solution. However, for common Global Positioning System (GPS) receivers, the pseudolite system requires some modifications of the user terminals. To solve the problem, this paper proposes a new pseudolite-based indoor positioning system architecture. The main idea is to receive real-world GPS signals, repeat each satellite signal and transmit those using indoor transmitting antennas. The transmitted GPS-like signal can be processed (signal acquisition and tracking, navigation data decoding) by the general receiver and thus no hardware-level modification on the receiver is required. In addition, all Tx can be synchronized with each other since one single clock is used in Rx/Tx. The proposed system is simulated using a software GPS receiver. The simulation results show the indoor positioning system is able to provide high accurate horizontal positioning in both static and dynamic situations.
Highlights
The widespread use of location-based services requires accurate user positioning information both outdoors and indoors
As introduced in the previous section, the user position estimation depends on the range between user terminal and TAs, which is included in the pseudorange measured by the Global Positioning System (GPS) receiver module of user terminal
The simulation test is performed in the following steps and illustrated in Figure 5: Step 1: Collecting real-world GPS data
Summary
The widespread use of location-based services requires accurate user positioning information both outdoors and indoors. There are two typical shortcomings: the positioning accuracy depends on the initial location and the positioning error increases with time [8] Compared to these methods, the pseudolite system has relatively larger coverage area (up to 50 km) and more accurate positioning solution (carrier phase) with 4–5 transmitters [13]. The repealite transmits received GPS signals, but the transmission on each antenna is continuous and delayed by different periods, which is the measurement of the user receiver [18,19]. The pseudorange difference corresponds to the distance between the indoor terminal and transmitting antenna, and a signal delay bias Four such measurements are used in the position calculation.
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