Gps Repeater For Indoor Positioning

The gps signal is then reproduced inside the building.

Gps repeater for indoor positioning.

The antenna located in the repeater unit can typically cover a radius of up to 20 metres but multiple repeaters can be used to provide coverage over a larger area. Gps or gnss repeaters consist of three components. Block diagrams of an analog digital repeater and a central processor are presented and parameters and performances are discussed. In this paper the authors focus on the differences between global positioning system gps and repeating gps rgps.

An active outdoor gps antenna typically mounted on the roof of a building to pick up signals a repeater unit with a built in passive antenna used to re transmit the gps signal indoors and a coaxial cable that connects the two. If the use of gnss repeater is allowed for certain indoor environments under rf radiation regulations switching and or delaying gnss signals enables indoor positioning without any new pn code and signal generator as with pseudolites. Each repeater retransmits the gps signals continuously to the indoor receivers without sequential switching. A gps repeater system sometimes referred to as a gps re radiator is used to bring satellite signals indoors providing positioning and timing signals inside areas where not usually present.

Depending on the size of the building a number of repeaters will be installed such as at 10 15 meter intervals. Assume more than one satellite is visible to four or more repeaters. In this paper a gps repeater based indoor positioning approach is proposed. Unlike most repeater based indoor positioning techniques in current literature repeaters are not required to connect to an outdoor antenna with fixed length cables.

They propose a method which involves the partial fitting of gps into a rgps system. A coaxial cable is then used to feed the signal into the building to a relatively small and compact repeater unit.