Carrier synchronization method and device for deep space communication

A carrier synchronization and deep space communication technology, applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve the problems of no phase ambiguity, phase ambiguity, etc., and achieve the effect of solving phase ambiguity

Active Publication Date: 2014-10-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the phase ambiguity problem in the existing carrier synchronization scheme, and propose a special optical carrier stage for deep space communication that does not carry user information, and realize no phase ambiguity through the phase identification process in stages Synchronous capture and tracking process of

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  • Carrier synchronization method and device for deep space communication
  • Carrier synchronization method and device for deep space communication

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with the accompanying drawings.

[0064] as attached figure 1 Shown is the working principle of the present invention, and its implementation mode is as follows:

[0065] First, acquisition is performed using a process where only carrier information exists. Firstly, the received monotone signal is subjected to quadrature demodulation. If there is a phase deviation between the received signal and the local carrier at this moment, the sine and cosine approximate values ​​of the phase deviation can be obtained respectively after the quadrature branch is matched and filtered. Utilize the power estimation result of the previous stage circuit, pass the I / Q branch through the shift register circuit with variable length, and do approximate normalization processing. Then, a relatively accurate phase deviation value is obtained through an arccosine trigonometric function lookup table. Finally, the obtained ph...

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Abstract

The invention discloses a carrier synchronization method and device for deep space communication. The carrier synchronization method is characterized in that, a process of only emitting carriers exists in each time of building a communication link, and information in the stage is used for capturing carrier signals; the signals are put into an orthogonal demodulation loop, after matched filtering I and Q branches are respectively subjected to table look-up mapping so as to prevent phase deviation having phase ambiguity; in a synchronous tracking stage, the invention provides a simple and convenient phase demodulation tracking loop design method which utilizes judgment of polarity, and thereby circuit design is simplified; phase deviation information output by the phase demodulation loop is put into a loop filter, and phase changes of local carriers are timely adjusted according to deviation result of the loop filter. The carrier synchronization method and device for deep space communication can solve the problem that common carrier synchronization technologies have phase ambiguity, and is simplified in design of the phase demodulation loop, thus being easy to achieve from the aspect of hardware.

Description

technical field [0001] The invention is a method for implementing carrier synchronization, which belongs to the field of communication technology, and in particular relates to the synchronization technology of communication systems in the field of deep space communication. Background technique [0002] Carrier synchronization technology is one of the key technologies of the receiver. When the received signal adopts synchronous demodulation or coherent detection, the receiving end needs to provide a coherent carrier with the same frequency and phase as the modulated carrier at the transmitting end. The acquisition of this carrier is called carrier Extraction or called carrier synchronization. Due to the influence of channel characteristics and oscillator instability during signal propagation, there will be a certain frequency offset and phase error between the modulated signal received by the communication system and the local carrier. This requires carrier synchronization t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00
Inventor 崔锐王成华朱秋明陈晓明陈学强朱锐居行波谷雨
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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