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Upsampling01:22

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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Note: A sub-sampling technique for frequency locking in Doppler wind lidar.

Yuan Yao1, Feng Li1, Lian Chen1

  • 1State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, Anhui 230026, China.

The Review of Scientific Instruments
|June 3, 2016
PubMed
Summary
This summary is machine-generated.

A new sub-sampling technique enhances Doppler wind lidar systems by enabling real-time frequency drift acquisition. This method achieves comparable performance to oscilloscopes for frequency locking, improving integration and real-time capabilities.

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Area of Science:

  • Atmospheric science
  • Optical engineering
  • Signal processing

Background:

  • Doppler wind lidar utilizes the double-edge technique to measure wind speeds by detecting Doppler frequency shifts.
  • Frequency drift in the outgoing laser can introduce errors in Doppler frequency shift measurements.
  • Existing methods often rely on high-sampling-rate oscilloscopes, limiting real-time processing and integration.

Purpose of the Study:

  • To develop a sub-sampling technique for real-time acquisition of laser frequency drift in Doppler wind lidar.
  • To improve the integration and real-time capabilities of Doppler wind lidar systems.
  • To achieve comparable performance to traditional oscilloscopes for frequency locking applications.

Main Methods:

  • A dedicated locking channel using a triple Fabry-Perot etalon was implemented to compensate for laser frequency drift.
  • A sub-sampling technique, based on statistical theory, was developed for acquiring frequency drift at a lower sampling rate.
  • Agilent Oscilloscopes with a 2.5 GSPS sampling rate were used for comparison in experimental setups.

Main Results:

  • The sub-sampling technique successfully acquires frequency drift at a 250 MSPS rate.
  • A prototype demonstrating the sub-sampling technique showed real-time ability and improved integration.
  • The prototype's performance for frequency locking was comparable to that of a high-sampling-rate oscilloscope.

Conclusions:

  • The presented sub-sampling technique offers a viable solution for real-time frequency drift compensation in Doppler wind lidar.
  • This approach enhances system integration and real-time processing without compromising measurement accuracy.
  • The developed technique provides a cost-effective and efficient alternative for frequency locking in lidar applications.