Wireless feedback type pseudo-satellite system time synchronization method and system

Abstract

The invention discloses a wireless feedback type pseudo-satellite system time synchronization method and system. The monitoring receiver receives ranging signals from each pseudo satellite, acquires and extracts a carrier phase observed quantity, calculates error information such as inter-station relative clock difference and pulse per second difference between each pseudo-satellite master stationand each pseudo-satellite slave station by using a clock difference equation, a time interval counter and an inter-station difference algorithm, and feeds each group of measured error information back to the corresponding pseudo-satellite slave station in real time to form a wireless negative feedback adjustment loop. The slave station clock synchronization module dynamically adjusts the slave station clock according to the time and frequency calibration model and the control mechanism by taking the time of the master station pseudo satellite as a reference so as to realize synchronous tracking of the master station clock. According to the invention, the time synchronization of the pseudo satellite system can be realized under the condition of keeping the original pseudo satellite systemsystem and structural form and equipment basically unchanged.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method and system for time synchronization of a wireless feedback pseudolite system. Background technique [0002] Satellite navigation technology has promoted the development of human society, but it also has some shortcomings. Satellite navigation signals are susceptible to interference and influence, which may be man-made or unavoidable natural factors. For example, in mountainous valleys or urban high-rise dense areas, satellite navigation systems cannot be guaranteed in terms of navigation, positioning, timing accuracy, reliability and integrity due to the blocking of satellite signals. The emergence of pseudolite technology provides new ideas and methods for solving these problems. Pseudolites can be used in combination with satellite navigation systems, or independently in indoor, tunnel and underground parking environments. [0003] Pseudo-satellites and ...

AI Technical Summary

Problems solved by technology

The wired clock distribution method is easily restricted by the geographical distribution environment or supporting facilities, and is sometimes difficult to implement

However, the wireless clock synchronization method requires two-way ranging. The pseudolite needs to send ranging signals and receive ranging signals. The technology and structure are complex and the cost is high.

However, although the wireless clock synchronization method is adopted, the technology is relatively complicated, but the mutual synchronization between pseudolite stations is a relatively flexible method, which is still widely concerned by the industry

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