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Doppler frequency cancellation based full digital main carrier tracking method

A technology of Doppler frequency and Doppler frequency difference, which is applied in the field of measurement and control communication, can solve the problems of frequency residual, difficulty in realization, and inability to completely eliminate Doppler frequency difference, and achieve Doppler frequency difference elimination, method Intuitive and easy effects

Inactive Publication Date: 2008-05-14
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

Using a phase-locked loop to track the remaining Doppler frequency difference has a simple structure and does not occupy much resources, but there is always a certain frequency residual, and the Doppler frequency difference cannot be completely eliminated; when the Doppler change rate is large , in order to track the change of the upper Doppler frequency, a high-order phase-locked loop is required, and the design of a high-order phase-locked loop involves the stability of the loop, which is very difficult to implement

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  • Doppler frequency cancellation based full digital main carrier tracking method
  • Doppler frequency cancellation based full digital main carrier tracking method
  • Doppler frequency cancellation based full digital main carrier tracking method

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing, introduce content of the present invention in detail:

[0021] Fig. 2 is a general realization block diagram of the main carrier tracking method based on Doppler frequency cancellation. as shown in picture 2. The receiver receives the USB measurement and control band-pass analog signal with Doppler frequency difference, and after passing through the analog-to-digital converter, quadrature down-converter, main carrier capture device and other devices in turn, most of the Doppler frequency difference is eliminated. Poor USB measurement and control digital complex baseband signal. The complex baseband signal passes through the spectral signal former, and two channels of spectrums are left-right symmetrical about the zero frequency. output after low-pass filtering. Finally, the two output signals pass through the Doppler frequency canceller to obtain a USB measurement and control digital complex baseband signal that complet...

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Abstract

The all-digital main carrier tracking method based on Doppler frequency cancellation belongs to the field of measurement and control communication. From the complex signal after the Doppler frequency difference, the FIR low-pass filter is used to extract the main carrier signal carrying the negative Doppler residual frequency difference information, and the positive and negative cancellation of the Doppler residual frequency difference is completed, so as to achieve the main carrier signal The purpose of carrier tracking. This method overcomes problems such as loop structure and parameter design trouble caused by the traditional method of using a phase-locked loop, Doppler residual error cannot be completely eliminated, etc., and is suitable for tracking the main carrier in the USB measurement and control system.

Description

technical field [0001] The invention relates to an all-digital main carrier tracking method based on Doppler frequency cancellation, which is suitable for main carrier tracking of unified S-band (Unified S-band, USB) measurement and control signals. This method does not need a feedback control loop, and can better achieve the purpose of eliminating Doppler frequency offset. This scheme is especially suitable for the tracking control of the main carrier under the condition of Doppler frequency change rate. The method belongs to the field of measurement and control communication. Background technique [0002] During the communication process, due to the radial movement speed (the speed along the straight line direction of the communication object) between the communication objects, the Doppler effect appears between the received signal and the transmitted signal, so that there is a Doppler frequency difference; In addition, in most cases, the movement of the communication ob...

Claims

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Application Information

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IPC IPC(8): H04L27/22H04J11/00
Inventor 詹亚锋赖卫东邢腾飞陆建华
Owner TSINGHUA UNIV
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