Visible light communication based positioning
A visible light communication and positioning signal technology, applied in the field of positioning systems based on visible light communication, can solve the problems of GPS signal loss and inapplicability of full indoor positioning services, etc.
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[0048] Figure 1 describes a GNSS communication system according to the prior art. The GNSS system may be GPS, GLONASS, Beidou, Galileo, or may use signals from satellites of one of these constellations.
[0049] In FIG. 1, a plurality of satellites 101, 102, 103, and 104 are transmitting GNSS positioning signals including information about the time of transmission delivered by a high-precision clock embedded in each satellite.
[0050] GNSS receiver 105 includes multiple tracking loops. Each tracking loop correlates a GNSS signal received from one of the satellites with a local copy of the signal, allowing it to determine when the signal was received. Retrieves the sending time of the signal from the navigation message. The time difference between the sending time and the receiving time is then formed. This time difference is called the pseudorange, which is related to the travel time between the satellite and the receiver. It is biased by many phenomena such as Tx and Rx ...
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