A carrier tracking circuit and carrier tracking method

A carrier tracking and carrier technology, applied in the field of satellite navigation, can solve the problems of low phase detection performance of the phase detector, increase the code phase measurement error, and the influence of carrier measurement accuracy, so as to ensure fixed gain, eliminate noise floor, and improve tracking. The effect of precision

Active Publication Date: 2019-04-26
BEIJING UNIV OF POSTS & TELECOMM
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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

Method used

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  • A carrier tracking circuit and carrier tracking method
  • A carrier tracking circuit and carrier tracking method
  • A carrier tracking circuit and carrier tracking method

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Embodiment Construction

[0027] according to figure 1 To illustrate the present invention, the carrier tracking circuit mainly includes:

[0028] a receiver (not shown in the figure), for receiving intermediate frequency signals;

[0029] Carrier NCO (numerically controlled oscillator): used to generate local carrier signals; sine LUT (display lookup table) module: generate digital sine signals using lookup table method; cosine LUT module: use lookup table method to generate digital cosine signals;

[0030] Carrier phase detection loop: the carrier NCO is connected to the sine LUT module and the cosine LUT module, the sine LUT module and the cosine LUT module are respectively connected to the first correlator and the second correlator, and the first correlator and the second correlator are connected to the EPL carrier Phase detector, EPL carrier phase detector is connected with carrier NCO to form.

[0031] Wherein, the sine LUT module and the cosine LUT module generate digital sine signals and digi...

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Abstract

The present invention relates to a carrier tracking circuit and a carrier tracking method. The carrier tracking circuit includes a carrier NCO, a sine LUT, a cosine LUT, a code generator, a shift register, a correlator, a code NCO, an EPL carrier phase detection loop and a code phase detection loop. The carrier tracking method forms an in-phase path and a quadrature path through the carrier NCO, sine LUT, and cosine LUT, and performs correlation operations with the advance, immediate, and lag codes formed by the code generator and shift register respectively, and outputs them to the correlator, and finally in the carrier discriminator Carrier phase and code discrimination of the tracked signal are carried out in the phase loop and the code phase discrimination loop. The accuracy of the carrier tracking circuit is improved by adopting the invention.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/29G01S19/37
CPCG01S19/29G01S19/37
Inventor 邓中亮马宏涛胡恩文尹露朱棣于鹏帅张志敏
Owner BEIJING UNIV OF POSTS & TELECOMM
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