id	keyword
ajst-23602	ppp
ajst-23602	positioning
ajst-23602	b2b
ajst-23602	correction
ajst-23602	precision
ajst-23602	time
ajst-23602	clock
ajst-23602	accuracy
ajst-23602	satellite
ajst-23602	service
ajst-23602	point
ajst-23602	information
ajst-23602	bds