A New Indoor Positioning System Architecture Using GPS Signals

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.

A Holistic Approach to Guarantee the Reliability of Positioning Based on Carrier Phase for Indoor Pseudolite

“…In (12), T L1 is a test statistic based on carrier phase L1 observations and T P1 is constructed based on pseudorange observations P1. These two statistics form the core of the CRAIM and PRAIM algorithm respectively.…”

“…Figure 8 shows the test statistics after applying two strategies. The construction of test statistics and the determination of thresholdare shown in expression (12) and (13). According to Figure 7, the DD observations of all pseudolites return to normal after the reference pseudolite is replaced.…”

“…The test statistics and threshold for fault identification in Experiment 2 are shown in Figure 13. The construction of test statistics and the determination of thresholdare shown in (12) and (13). Figure 12 shows that DD carrier-phase observations of PL6-1, PL6-4, and PL6-5 remain normal, which confirms the regular pattern of two motion periods and observations are stable.…”

An Implementation Approach and Performance Analysis of Image Sensor Based Multilateral Indoor Localization and Navigation System

“…Therefore, a considerably large modification is required to make the GPS system to be suitable for indoor localization. For example, the integration of GPS signals with the indoor transmitting antennas has been reported to localize sensor nodes [10]; however, it is not cost effective, and the localization error is observed to be 1 m in delay of 10 sec.…”

A Pseudorange Measurement Scheme Based on Snapshot for Base Station Positioning Receivers

“…However, due to the loss of GNSS signals by obstructions from buildings, the positioning effectiveness and accuracy of the GNSS are limited in urban canyons and indoor environments [2,3]. Therefore, terrestrial radio positioning systems and their enhancements to the GNSS are got increasing attention.…”