The invention belongs to the technical field of communication and positioning, and discloses a low-
orbit satellite real-time precision
orbit determination method and
system, and the method comprises the steps that a ground monitoring
station obtains the basic navigation positioning information of the ground monitoring
station through collecting the basic navigation positioning information of a
satellite navigation system, and transmits the basic navigation positioning information to a ground master control
station; the ground master control station generates
satellite navigation system differential correction information according to the physical position information of the ground master control station and the basic navigation positioning information of the ground monitoring station, andsends the
satellite navigation system differential correction information to an uplink injection station; the uplink injection station sends the
differential correction information of the
satellite navigation system to a Beidou-3 satellite; the Beidou-3 satellite broadcasts
satellite navigation system differential correction information by using a short message communication function; and after receiving the
satellite navigation system differential correction information, the low-
orbit satellite performs real-time precise
orbit determination in combination with the low-orbit satellite basic navigation positioning information received by the satellite-borne
receiver of the low-orbit satellite. The method and the system have the advantages that the method and the system do not depend on an
external communication link, are completely independent and are high in safety and
cost performance.