Positioning system
First Claim
1. Positioning system using primary positioning signals emitted by at least one of satellites, pseudolites or another signal emitting device, comprising:
- a receive antenna for receiving an input signal containing the primary positioning signals;
a repeater operatively connected to the receive antenna for processing the input signal in order to produce a plurality of secondary positioning signals, each of the plurality of secondary positioning signals distinguished from the remaining secondary positioning signals by a specific carrier frequency different from carrier frequencies of the primary positioning signals;
a plurality of transmit antennas with fixed positions relative to the receive antenna and operatively connected to the repeater, each of the transmit antennas transmitting one of the secondary positioning signals; and
at least one receiver capable of receiving and processing the primary positioning signals in order to determine a position of the receiver from the primary positioning signals and further adapted for receiving and processing the secondary positioning signals in order to determine the position of the receiver from the secondary positioning signals.
1 Assignment
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Accused Products
Abstract
For allowing positioning of a GPS receiver within a building, GPS primary positioning signals received by an outdoor receive antenna are up-converted to different carrier frequencies in the 2.4 GHz ISM band and the converted signals are transmitted each by a transmit antenna inside the building, the transmit antennas serving at the same time as access points of a WLAN which is used for transmitting additional positioning data like the positions of the transmit antennas and the signal delay times associated with them. By cycling through the secondary positioning signals received from the transmit antennas, i.e., down-converting each of them during an assigned time slot, and determining clock bias differences in the receivers the position of the latter is determined using TDOA algorithms.
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Citations
16 Claims
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1. Positioning system using primary positioning signals emitted by at least one of satellites, pseudolites or another signal emitting device, comprising:
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a receive antenna for receiving an input signal containing the primary positioning signals;
a repeater operatively connected to the receive antenna for processing the input signal in order to produce a plurality of secondary positioning signals, each of the plurality of secondary positioning signals distinguished from the remaining secondary positioning signals by a specific carrier frequency different from carrier frequencies of the primary positioning signals;
a plurality of transmit antennas with fixed positions relative to the receive antenna and operatively connected to the repeater, each of the transmit antennas transmitting one of the secondary positioning signals; and
at least one receiver capable of receiving and processing the primary positioning signals in order to determine a position of the receiver from the primary positioning signals and further adapted for receiving and processing the secondary positioning signals in order to determine the position of the receiver from the secondary positioning signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification