The effect of sampling frequency and front-end bandwidth on the DLL code tracking performance
نویسندگان
چکیده
The synchronization of the received pseudorandom (PRN) code and the local generated replica is fundamental to compute user position in Global Navigation Satellite System (GNSS) receivers. The more accurate correlation output and Delay Locked Loop (DLL) code tracking error are described in this paper from the hardware receiver point of view. Estimation is based on the number of samples per code chip and the residual code phase of the code Numerical Controlled Oscillator (NCO) after a code chip is generated. The theoretical as well as experiment results show that the relation between the sampling frequency and front-end filter bandwidth has a strong influence in the code tracking. Increasing the sampling frequency can help to improve the DLL tracking performance if and only if the front-end bandwidth is much smaller than the sampling frequency. The more accurate estimation of the correlation and the DLL tracking error, proposed in this paper, can generally apply on precisely modeling GNSS receiver baseband signal processing.
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