Bit synchronization method and device of compatible Beidou satellite navigation system and global position system (GPS)

Abstract

The invention discloses a synchronization method. The bit synchronization method and device of a compatible Beidou satellite navigation system and a global position system (GPS) is characterized in that correlation integral data of I branch of a channel and data of Q branch can be read; supposing that 20 conceivable bit boundaries exist and can generate stripping codes of NH codes so as to strip the NH code of the Beidou satellite navigation system, but the GPS does not need to be operated in that way; detection of data jumping is carried out and the detection result need to be compared to decide that the maximum conceivable boundary of the data jumping number is a boundary of a real sign bit. The invention further discloses a synchronization device . By means of the above-mentioned method and the device, the bit synchronization of the Beidou satellite navigation system and signals of the GPS can be carried out at the same time. In addition, sensitivity of the bit synchronization of navigation signals can be improved by adjusting the time of the bit synchronization, and therefore the bit synchronization method and device of the compatible Beidou satellite navigation system and the GPS has higher military and commercial value.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and positioning, in particular to a method and system for bit synchronization of satellite signals. Background technique [0002] At present, China's Beidou navigation system is developing rapidly, and positioning-based services continue to expand. The number of satellites that can be used for positioning in the sky above the earth is increasing. The research and application of the receiving technology related to the Global Navigation Satellite System (GNSS) has gradually deepened, and the design and development of dual-mode or multi-mode receivers that support the Global Positioning System (GPS) and the Beidou satellite navigation system at the same time has become an inevitable trend . A navigation and positioning receiver usually includes: antenna, radio frequency module, baseband module and other application modules. Among them, the baseband module is usually used to complete si...

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Problems solved by technology

[0005] For MEO satellites, the period of the pseudo-random code is also 1ms. Similarly, each Beidou data signal must be repeated 20 times to ensure reliable transmission without an error correction mechanism. Unlike GPS, the 20ms data in each bit The NH code modulation is used, that is to say, there is also a symbol jump inside each bit of data. In this way, the same bit synchronization method of the GPS signal is not suitable for the MEO satellite signal of the Beidou navigation system, and a new bit synchronization algorithm must be developed ;

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