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OQPSK satellite bidirectional time comparison signal frequency synchronization method

A two-way time comparison and signal frequency technology, applied in the field of satellite communication, can solve problems such as poor dynamic performance, use restrictions, and inability to apply to high dynamic environments, and achieve the effect of improving frequency band utilization efficiency

Pending Publication Date: 2021-05-07
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The dynamic performance of this demodulation method is poor, which restricts its use in satellite channels and cannot be applied to environments with high dynamics

Method used

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  • OQPSK satellite bidirectional time comparison signal frequency synchronization method
  • OQPSK satellite bidirectional time comparison signal frequency synchronization method
  • OQPSK satellite bidirectional time comparison signal frequency synchronization method

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Embodiment Construction

[0046] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0047] The present invention adds a preprocessing unit on the basis of the original carrier phase-locked loop and data bit loop unit in the receiver, and preprocesses the received high data rate OQPSK digital transmission signal through a nonlinear operation mode, and the processed The signal contains the carrier quadrupled signal of the received signal and other random noise components. The influence of the jump of data information is removed by means of preprocessing, and only the carrier information of the received sign...

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Abstract

The invention discloses an OQPSK satellite bidirectional time comparison signal frequency synchronization method and system. The method comprises the steps of: carrying out the nonlinear preprocessing of a received OQPSK data transmission signal to obtain a carrier quadruplicated frequency signal; carrying out frequency extraction on the carrier quadruplicated frequency signal in a fast Fourier transform (FFT) and frequency-locked loop (FLL) mode; outputting the extracted carrier frequency to a phase-locked loop and a bit synchronization loop for dynamic assistance; and carrying out carrier and data phase tracking on the received OQPSK data transmission signal to complete demodulation of real-time time comparison data information.

Description

technical field [0001] The invention relates to the field of satellite communication. More specifically, it relates to an OQPSK satellite two-way time comparison signal frequency synchronization method. Background technique [0002] High-precision time synchronization is the basis for time-frequency mass transmission and traceability. With the promotion of fast UTC by the International Bureau of Weights and Measures (BIPM), various time-keeping laboratories have also put forward higher requirements for the real-time performance of remote comparison results. Satellite two-way time comparison technology is a widely used high-precision time transfer method. The two ground stations transmit modulated time signals to the satellite at the same time. After being forwarded by the satellite, the two stations respectively receive the signals from the other station. The two ground stations exchange the received signal data and subtract them to obtain a high-precision time clock diffe...

Claims

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Application Information

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IPC IPC(8): G01S19/25
CPCG01S19/256Y02D30/70
Inventor 王艺陶张升康王海峰
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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