Carrier tracking circuit and carrier tracking method

Abstract

The invention relates to a carrier tracking circuit and a carrier tracking method. The carrier tracking circuit is composed of a carrier NCO, a sine LUT, a cosine LUT, a code generator and a shift register, correlators, a code NCO, an EPL carrier phase discriminator loop and a code phase discriminator loop. In addition, the carrier tracking method includes: the carrier NCO, the sine LUT, and the cosine LUT form an in-phase circuit and an orthogonal circuit; the in-phase circuit, the orthogonal circuit, the code generator and the shift register form an advance code, an instant code, and a lag code; the correlation operation is carried out on the codes and results are outputted to the correlators; and then carrier phase and code discrimination is carried out on tracked signals in the carrier phase discriminator loop and the code phase discriminator loop. Therefore, the precision of the carrier tracking circuit is improved.

Description

technical field [0001] The invention relates to a carrier tracking circuit and a carrier tracking method, belonging to the field of satellite navigation. Background technique [0002] In today's society, the Global Navigation Satellite System (GNSS) has changed to include American GPS (Global Positioning System), Russian GLONASS (abbreviation of "Global Navigation Satellite System GLOBAL NAVIGATION SATELLITE SYSTEM" in Russian), European Galileo (Galileo Satellite Navigation System) and The multi-system and multi-frequency point environment of China's BDS (Beidou Satellite Navigation System). For these systems, the tracking loop of the carrier in the tracking loop is very important. At the same time, the performance of the phase detector determines the tracking error of the entire tracking loop. The arctangent phase detector is used because of its low phase detection error Widely used, for example, the real-time two-quadrant arctangent phase detector uses the quadrature and...

AI Technical Summary

Problems solved by technology

However, the modeling and theoretical derivation of the phase detector are carried out under the premise of ignoring the influence of noise. In actual use, due to the intervention of noise, the phase detection performance of the phase detector is low, which not only affects the accuracy of carrier measurement It has caused an impact and also increased the measurement error of the code phase, especially in the loop structure that uses carrier tracking to assist code tracking

Images