id	keyword
esrj-92151	data
esrj-92151	sensing
esrj-92151	measurement
esrj-92151	gps
esrj-92151	crowd
esrj-92151	method
esrj-92151	satellite
esrj-92151	frequency
esrj-92151	signal
esrj-92151	network
esrj-92151	acquisition