Anti-multipath method of boc signal based on two-dimensional tracking structure

Abstract

The invention provides a BOC signal anti-multipath method based on a two-dimensional tracking structure. The method is used for a receiver structure of 'carrier loops + subcarrier loops + code loops'. According to the method, subcarrier tracking loops are specially designed, so that the effective integral interval of a correlative value used for subcarrier tracking and subcarrier delay estimation is [0,Te], wherein Te<Tc, the Tc represents the width of pseudo code chips, and that is, the subcarrier tracking and the subcarrier delay estimation only utilize the energy of the part arriving early of each pseudo code chip; meanwhile, an optimized method is provided for the design of a pseudo code tracking loop phase demodulation method in order to acquire better anti-multipath effect, and corresponding constraint conditions are put forward for the effective integral interval and a code loop phase demodulation interval utilized by the subcarrier loops on the basis of the characteristics of a two-dimensional autocorrelation function of BOC signals. The BOC signal anti-multipath method based on the two-dimensional tracking structure can significantly reduce effects of multiple paths on ranging in the 2-D tracking process, has obvious restraining effects on multipath errors with long delay time and provides considerable performance improvement.

Description

technical field [0001] The invention belongs to the field of wireless spread-spectrum signal ranging, especially for BOC spread-spectrum signals, and is used for suppressing the influence of multipath in its ranging, and is a BOC signal anti-multipath method based on a two-dimensional tracking structure. Background technique [0002] Global Navigation Satellite Systems (GNSS) can provide all-weather, uninterrupted, real-time positioning and timing information, and has become an important infrastructure for a country to support the national economy and ensure national security. The user's positioning, speed measurement, and timing accuracy in the GNSS system depend on the receiver's measurement accuracy of the navigation signal delay. In an actual environment, various factors can affect the measurement accuracy of the delay. Among them, the multipath effect is the most special one among many factors. It is related to the specific environment around the user, and it is diffic...

AI Technical Summary

Problems solved by technology

However, the current research shows that the existing method does not significantly suppress the multipath error of the BOC signal, and the multipath error under this method is basically consistent with the error of the traditional tracking method

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