GNSS receiver, terminal device and positioning system

The invention discloses a GNSS receiver, a terminal device and a positioning system, wherein the GNSS receiver is composed of an antenna, a radio frequency circuit and a base-band circuit; the base-band circuit further comprises an intermediate frequency data write-in unit, a memory and an intermediate frequency data reading unit; the intermediate frequency data write-in unit is used for storing digital intermediate frequency signals output by the radio frequency circuit in the memory; and the intermediate frequency data reading unit is used for responding to a position calculation instruction sent by an external device and reading the digital intermediate frequency signals from the memory, and the digital intermediate frequency signals are used for position calculation. According to the invention, the real-time calculation of the user position is avoided, only the digital intermediate frequency signals output by the radio frequency circuit are stored, and when the external device needs to carry out position calculation, the GNSS receiver provided by the invention or the external device can carry out position calculation by means of the stored digital intermediate frequency signals, so that the power consumption of the GNSS receiver provided by the invention is lower.