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Method and device for carrier tracking in satellite mobile communication

A technology of satellite mobile communication and carrier tracking, which is applied in the field of communication and satellite mobile communication, and can solve the problems of difficult signal model and satellite mobile communication.

Active Publication Date: 2014-04-02
华力智芯(成都)集成电路有限公司
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Problems solved by technology

[0003] In the current satellite signal tracking, second-order or third-order loops are mostly used. For example, GPS system, the second-order loop can meet the requirements, but the signal model of GPS is difficult to be directly used in satellite mobile communication, so it is necessary to use the second-order loop order loop with appropriate modifications

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  • Method and device for carrier tracking in satellite mobile communication
  • Method and device for carrier tracking in satellite mobile communication
  • Method and device for carrier tracking in satellite mobile communication

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Embodiment Construction

[0023] In the carrier loop tracking technology, since the loop tracking accuracy and tracking speed are often a pair of contradictions, it is necessary to comprehensively consider the accuracy and speed to select the appropriate B L and ζ. In the embodiment of the present invention, an automatic frequency control loop similar to a phase-locked loop is mainly used, and the carrier tracking loop is as figure 1 shown. Because the accuracy of carrier tracking is not only related to the noise bandwidth of the loop filter, but also related to the estimation accuracy of the frequency offset estimation module. Therefore, the embodiments of the present invention mainly design implementation methods of a frequency offset estimation module (Frequency offset estimation) and a loop filter module (Loop filter).

[0024] Based on the above-mentioned involvement, embodiments of the present invention provide a method for carrier tracking in satellite mobile communications, such as figure 2...

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Abstract

The invention discloses a method and a device for carrier tracking in satellite mobile communication and relates to the field of communication. The method and the device can realize the tracking of carriers with frequency which changes quickly in the satellite mobile communication. The method disclosed by the invention mainly comprises of realizing frequency offset estimation of received signals by inserting a certain quantity of symbol training sequences in bursts in a carrier tracking loop for the satellite mobile communication, obtaining the approximate frequency offset estimation values of the received signals, bringing the approximate frequency offset estimation values into a loop filter for filtering to obtain filtered frequency offset estimation values, and adjusting a VCO (Voltage Controlled Oscillator) of the filter in the carrier tracking loop through the filtered frequency offset values to realize the carrier tracking of the satellite mobile communication. The method and the device for the carrier tracking in the satellite mobile communication disclosed by the embodiment of the invention are mainly used for the carrier tracking process in the satellite mobile communication.

Description

technical field [0001] The invention relates to the field of communication, in particular to the field of satellite mobile communication, in particular to a carrier tracking method and device in satellite mobile communication. Background technique [0002] In satellite mobile communication, due to the relative movement of the transceiver, Doppler frequency shift will be caused, and due to the inconsistency of the local crystal oscillator at the transceiver end, there is a large frequency deviation between the reception of the ground terminal or the airborne terminal and the transmission signal of the satellite. . In addition, due to the accelerated movement, there is a Doppler frequency change in the received signal of the ground terminal or the airborne terminal (the maximum change rate of the ground terminal is 32.5Hz / s, and the maximum change rate of the airborne terminal is 67.7Hz / s). Therefore, in order to correctly demodulate data, carrier tracking in satellite mobile...

Claims

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Application Information

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IPC IPC(8): H04L27/00
Inventor 刘解华刘斌彬吴彦奇
Owner 华力智芯(成都)集成电路有限公司
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