Analog-digital hybrid high-speed signal time measurement system based on clock data recovery

A technology for clock data recovery and time measurement, which is applied in digital transmission systems, measurement devices, transmission systems, etc., can solve problems such as ADC sampling peak rate limitation, and achieve the effects of increased communication rate, high information utilization, and frequency offset elimination

Active Publication Date: 2020-05-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the existing ADC sampling peak rate limitation, and to provide an analog-digital mixed high-speed signal time measurement system based on clock data recovery

Method used

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  • Analog-digital hybrid high-speed signal time measurement system based on clock data recovery
  • Analog-digital hybrid high-speed signal time measurement system based on clock data recovery
  • Analog-digital hybrid high-speed signal time measurement system based on clock data recovery

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Embodiment 1

[0028] In the existing technology, the subsequent digital signal processing relies on the front-end ultra-high-speed ADC, so when the transmission data rate is too high, such as 5Gbps in this solution, in order to restore the original signal to the sampling signal, the sampling rate must meet the Nyqui The Stern criterion, that is, more than twice the communication rate, so the ADC sampling rate of this solution needs to be at least 10Gsps, which is too high for the ADC, consumes a lot of resources and power consumption, and limits the further improvement of the communication rate. Based on the performance limitation of ADC, the present invention proposes an analog-digital hybrid high-speed signal time measurement system based on clock data recovery, which uses an integrated CDR chip to recover two signals with strict phase alignment, and one is a data signal for subsequent data The other channel is the clock signal, which is used as auxiliary information for distance measureme...

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Abstract

The invention relates to an analog-digital hybrid high-speed signal time measurement system based on clock data recovery, and belongs to the field of communication signal processing. The system comprises a laser receiving module, a clock data recovery module, a clock management module, a frequency mixing module, a low-pass filtering module, a sampling module, a carrier tracking module, a signal capturing module and a ranging velocity measurement information resolving module. Through the system disclosed by the invention, the dependency on the high-speed ADC by a signal processing algorithm canbe reduced, the requirement on the ADC sampling rate is reduced, the data communication rate is further improved, the information utilization rate on the communication / ranging frame can be increased,and the ranging velocity measurement precision is improved.

Description

technical field [0001] The invention relates to an analog-digital mixed high-speed signal time measurement system based on clock data recovery, which belongs to the field of communication signal processing. Background technique [0002] In satellite communication, the measurement and control integrated system with laser as the carrier is an important part of the overall system. In order to complete the control and data transmission of the space-based terminal, and obtain the distance, radial velocity, acceleration and other information of the space-based terminal, it is particularly important to realize the synchronization and tracking of high-speed signals, as well as high-precision distance measurement and speed measurement. [0003] For signal synchronization and tracking, the sliding correlation algorithm uses the coherence of the frame header to complete signal capture, that is, coarse synchronization. The phase-locked loop can lock the phase difference between the inp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/033H04L7/04G01D21/02
CPCG01D21/02H04L7/033H04L7/042
Inventor 宋璟昱朱理辰马永锋刘昊卜祥元安建平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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