Multi-system combined satellite navigation positioning time service device and method

The invention discloses a multi-system combined satellite navigation positioning time service device and method, and aims at two different application scenes of positioning time service and independent time service, and realizes the optimization and improvement of the reliability of positioning and time service results by utilizing the uniquely determined information of the position and time information of a receiver. Under the application scene that the position of the time service device is not accurately calibrated, the time service device is independently positioned by adopting the observed quantity of each system, and the position of the time service device is unique, so that the information of four positions obtained by resolving the four systems can be mutually checked, and the position and time information with higher reliability can be obtained; the accurate position of the time service device is obtained in a pre-calibration mode, by means of the accurate position of the time service device, satelli