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A New Indoor Positioning System Architecture Using GPS Signals.

Xu R, Chen W, Xu Y, Ji S - Sensors (Basel) (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: The Hong Kong Polytechnic University, Hong Kong, China. ruixu.nj@gmail.com.

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.

No MeSH data available.


Related in: MedlinePlus

Positioning error variation with velocity.
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sensors-15-10074-f012: Positioning error variation with velocity.

Mentions: More dynamic tests are conducted using back-and-forth trace between (1, 1, 22) and (99, 99, 22) with different velocities of 1.5 m/s (normal human walking speed), 2.5 m/s (jogging speed), 10 m/s, 15 m/s and 20 m/s. The Root Mean Square (RMS) of the X-axis and Y-axis errors are summarized in Figure 12. The simulation results show the positioning accuracy in the X-axis and Y-axis generally degrades with increasing velocity. In the case of velocity = 20 m/s, the X-axis error is 1.81 m, 0.56 m larger than that in the case of velocity = 5 m/s. The Y-axis error increases from 1.15 m at velocity = 5 m/s to 1.63 m at velocity = 20 m/s. The increase reaches 0.56 m. As the human normal walking and jogging speeds are less than 5 m/s, the proposed system is able to provide position estimation with accuracy of about 1.2 m in the X-axis and Y-axis for persons.


A New Indoor Positioning System Architecture Using GPS Signals.

Xu R, Chen W, Xu Y, Ji S - Sensors (Basel) (2015)

Positioning error variation with velocity.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4481917&req=5

sensors-15-10074-f012: Positioning error variation with velocity.
Mentions: More dynamic tests are conducted using back-and-forth trace between (1, 1, 22) and (99, 99, 22) with different velocities of 1.5 m/s (normal human walking speed), 2.5 m/s (jogging speed), 10 m/s, 15 m/s and 20 m/s. The Root Mean Square (RMS) of the X-axis and Y-axis errors are summarized in Figure 12. The simulation results show the positioning accuracy in the X-axis and Y-axis generally degrades with increasing velocity. In the case of velocity = 20 m/s, the X-axis error is 1.81 m, 0.56 m larger than that in the case of velocity = 5 m/s. The Y-axis error increases from 1.15 m at velocity = 5 m/s to 1.63 m at velocity = 20 m/s. The increase reaches 0.56 m. As the human normal walking and jogging speeds are less than 5 m/s, the proposed system is able to provide position estimation with accuracy of about 1.2 m in the X-axis and Y-axis for persons.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: The Hong Kong Polytechnic University, Hong Kong, China. ruixu.nj@gmail.com.

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.

No MeSH data available.


Related in: MedlinePlus