METHOD AND SYSTEM FOR IMPLEMENTING REAL-TIME TRANSMISSION AND DEMODULATION TECHNOLOGY FOR BEIDOU SATELLITE NAVIGATION SIGNALS

摘要

Disclosed in the present invention are a method and system for implementing real-time transmission and demodulation technology for Beidou satellite navigation signals, the method comprising: constructing a large-scale parallel signal transmission branch; grouping satellite navigation messages in a large scale and sequentially sending the messages to the parallel signal transmission branch; driving a complex shift pseudo-random code generator by using a nonlinear function so as to obtain a ranging sub-code dedicated to the navigation satellite parallel transmission branch, and spreading the spectrum of each branch navigation message; first shifting the same carrier modulation at different frequencies, then superposing all branch carrier modulation navigation signals and adding noise to form a composite satellite navigation signal; and finally sending the signal by means of a single antenna; a receiving end respectively demodulating the received navigation signals in real time according to branch by means of a plurality of channels of the single antenna which comprise a sub-channel so as to change the messages from parallel transmission to serial transmission; and performing positioning solution according to the navigation messages so as to allow a Beidou satellite navigation positioning system to navigate and position quickly. The present invention may be widely applied to satellite navigation systems, as well as being used in various ranging systems, communication systems, radio and television systems and control systems.