Carrier wave tracking technology for GPS (global positioning system) satellite receiver

Abstract

The invention discloses a carrier wave tracking technology for a GPS (global positioning system) satellite receiver. A signal acquirer, a signal frequency mixing correlator and a DSP (digital signal processor) are used in the carrier wave tracking technology for the GPS satellite receiver; a signal converter is arranged between the signal acquirer and the signal frequency mixing correlator; radiofrequency signals received by the signal acquirer are converted into digital intermediate frequency signals; after being subjected to signal frequency mixing and correlation operation of the correlator, the signals are outputted to the DSP and are used for loading corresponding algorithms; correlated results of the signals are subjected to phase discrimination and are filtered; carrier wave tracking is carried out by a third-order phase locked loop; pseudo codes are tracked by a delay locked loop to obtain data of the correlated results; and the signals processed by the DSP are transmitted to a display screen of a computer and a voice playing device. By the carrier wave tracking technology for the GPS satellite receiver, after the signal acquirer acquires signals, the radiofrequency signals are converted into digital intermediate frequency signals through the signal converter, follow-up computing and processing are facilitated greatly, the speeds and the coordinates of a tracked object are displayed in the display screen, and the tracking precision of the GPS signals is greatly improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation receivers, in particular to a GPS satellite receiver carrier tracking technology. Background technique [0002] GPS (Global Positioning System) has omnipotent, global, all-weather, continuous and real-time navigation, positioning and timing functions, and can provide users with precise three-dimensional coordinates, speed and time. GPS technology is widely used in civil and military fields, and has produced excellent economic and social benefits, and has become an indispensable and important technical means in the information age. Satellite navigation receiver technology is an important part of GPS technology, which directly affects GPS positioning and timing. [0003] Traditional navigation receivers are generally used in environments with strong navigation signals such as the surface and outdoors. In these environments, navigation signals are not affected by shadowing, multipath, ...

AI Technical Summary

Problems solved by technology

In indoor, tunnel, dense forest and other similar working environments, the navigation signal is easily affected by the external environment, and in the prior art, the received signal cannot be clearly understood after the processing of the tracking object.

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