Design of a gnss tracking loop software correlator and adaptive intelligent tracking method

Abstract

The invention discloses a GNSS track loop software correlator design and a self-adaptive intelligent tracking method. Intelligent satellite navigation work mode switching, different types of track loop software correlator self-adaptive intelligent matching and intelligent navigation and positioning are carried out based on the situation where a software receiver receives different intensities of GNSS satellite signals in different environment and at different time periods. No matter under a normal environment, a highly-dynamic environment or a weak satellite signal environment, the characteristics of the track loop software correlator under different quantitative rules can be made full use of, and a balance can be achieved among tracking accuracy, computation complexity and quantitative loss; and seamless positioning under a plurality of environments of urban traffic, avenues and tunnels and the like can be effectively realized.

Description

technical field [0001] The invention relates to a tracking loop correlator, specifically a tracking loop correlator of a GNSS software receiver, and the invention also discloses an adaptive tracking method thereof. Background technique [0002] In recent years, with the widespread use of GNSS software receivers and the rapid development of digital signal processing technology, the method of processing GNSS satellite signals tends to be realized by software. This method is to introduce the concept of "software radio" into the GNSS receiver. In the receiver, the ADC module is used to digitize the signal as close as possible to the antenna, and then the software is used to process the digital signal to achieve positioning, such as figure 1 shown. In the past, traditional GNSS receivers used a series of ASIC chips for radio frequency reception, baseband signal processing, navigation calculation, etc., except that the radio frequency front-end part has not changed, and all subse...

AI Technical Summary

Problems solved by technology

[0004] The current software receiver algorithm can already complete the real-time processing of GPS L1 signals on ordinary PCs, but further improvement is needed: on the one hand, with the emergence of new GNSS systems and the modernization of GNSS, the signal bandwidth may be 2 times higher than that of GPS L1 signals to 10 times (for example, the B1 frequency point of China's Beidou satellite navigation system is twice the signal bandwidth of the GPS L1 frequency point), which puts forward new requirements for the computing power of the software receiver; on the other hand, some of the above methods are obtained through Losing signal quality in exchange for computational efficiency, some methods are only applicable to specific quantization bits

Images