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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: 2017-09-08
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
  • Carrier synchronization method and device for deep space communication

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Embodiment Construction

[0064] The present invention will be further explained below in conjunction with the drawings.

[0065] As attached figure 1 Shown is the working principle of the present invention, and its implementation is as follows:

[0066] First, use the process of only carrier information to capture. First, perform quadrature demodulation of the received single tone signal. If the phase deviation between the received signal and the local carrier at the moment, the sine and cosine approximations of the phase deviation can be obtained after the quadrature branch matched filtering. Using the power estimation result of the previous stage circuit, the I / Q branch is passed through a variable-length shift register circuit for approximate normalization. Then, a more accurate phase deviation value is obtained through the trigonometric function lookup table of arcsine and cosine. Finally, the obtained phase deviation value is filtered through the loop to obtain the corresponding control word of the ...

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Abstract

The present invention discloses a carrier synchronization method and device for deep space communication, which is characterized in that: each time a communication link is established, there is a process of only transmitting the carrier, and the carrier signal is carried out by using the information of this stage Capture; the signal is passed through the quadrature demodulation loop, and after matched filtering, the I and Q branches are respectively mapped through a look-up table to avoid phase ambiguity in the phase deviation; in the synchronous tracking stage, the present invention proposes a The simple design method of the phase detection and tracking loop simplifies the circuit design; the phase deviation information output by the phase detection loop is passed through the loop filter, and the deviation result of the loop filter adjusts the phase change of the local carrier in real time. The invention can solve the phase ambiguity problem existing in the general carrier synchronization technology, has a simplified phase detection loop design, and is easy to realize by hardware.

Description

Technical field [0001] The invention is a method for implementing carrier synchronization, which belongs to the field of communication technology, and particularly relates to the synchronization technology of a communication system 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 receiver needs to provide a coherent carrier with the same frequency and phase as the modulated carrier of the transmitter. The acquisition of this carrier is called the carrier Extraction or carrier synchronization. Due to the influence of channel characteristics and oscillator instability during signal propagation, the modulated signal received by the communication system and the local carrier will have a certain frequency offset and phase error. This requires carrier synchronization to eliminate the frequency and ...

Claims

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Application Information

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Patent Type & Authority Patents(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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