A SUPL-based A-GPS simulator support for indoor positioning
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Conventional Global Positioning System (GPS) receivers
are designed to operate in open-sky environments and
have difficulty dealing with signal blockage from
buildings and foliage which deteriorates their
performance in urban canyons, indoors, and underground.
In recent years, engineers have developed receivers that
perform satisfactorily even with severely attenuated
signals by providing external assistance such as satellite
orbit parameters, reference time and coarse locations.
This approach known as Assisted GPS significantly
facilitates the acquisition of satellite signals, and relieves
the receiver from the data demodulation tasks.
While it is common to use GPS simulators for testing
receivers only high-end simulators support testing of AGPS
capability as it involves additional assistance
generation and delivery to target devices in addition to
GPS signal or measurement generation. Typically such
simulators are not affordable for many academic
institutions. This paper describes an affordable approach
to augment conventional GPS simulators with A-GPS
testing support.