Universal GPS indoor and outdoor positioning system and method

Abstract

The invention discloses a universal GPS indoor and outdoor positioning system and method. The universal GPS indoor and outdoor positioning system comprises a GPS pseudo satellite main station, three or more GPS pseudo satellite auxiliary stations, and a user receiver. The GPS pseudo satellite main station receives outdoor GPS signals in real time, acquires PPS (pulse per second) signal and a current visible satellite parameter, disciplines the clock of a local pseudo satellite main station by means of the PPS signal, synchronously generates two radiofrequency signals by means of a local disciplined clock, sends one radiofrequency signal to a user, and send the other radiofrequency signal to the GPS pseudo satellite auxiliary stations. The GPS pseudo satellite auxiliary stations receive signal sent from the GPS pseudo satellite main station, achieve synchronization between the local clocks of the GPS pseudo satellite auxiliary stations and the clock of the GPS pseudo satellite main station, and synchronously generate virtual GPS satellite simulating signals. The user synchronously receives the virtual GPS satellite signals sent from the visible pseudo satellite main station and pseudo satellite auxiliary stations and completes indoor and outdoor positioning of the user in real time. The universal GPS indoor and outdoor positioning system is simple and is not required to change the software and the hardware of a conventional GPS receiver.

Description

technical field [0001] The invention relates to the field of satellite navigation and positioning, in particular to a general GPS indoor and outdoor positioning system and method. Background technique [0002] Due to some congenital factors of the satellite navigation system itself, there are some insurmountable weaknesses. For example, for indoor users, due to the blocking of surrounding walls or other obstacles, when the satellite signal reaches the room, the satellite signal is already very weak, and it is impossible to complete the positioning with a traditional GNSS receiver. [0003] At present, pseudolite is a method to solve indoor positioning. Since the GPS pseudolite positioning system emits signals similar to GPS satellites, its positioning algorithm is also based on the principle of GPS positioning. However, indoor pseudolites are fixed at a certain fixed position, while GPS satellites move periodically along the orbit, and their positioning algorithms are diffe...

AI Technical Summary

Problems solved by technology

However, indoor pseudolites are fixed at a certain fixed position, while GPS satellites move periodically along the orbit, and their positioning algorithms are different.

Therefore, the traditional pseudolite positioning cannot use the GPS receiver for direct positioning, but needs to modify some programs in the GPS receiver, or use the GPS receiver to receive the signal, and then add a CPU behind it to specifically realize the positioning solution, that is, this It is necessary to change the software and hardware of the GPS receiver, which not only brings inconvenience to the user, but also increases the cost

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