A High-Accuracy Frequency Estimation Approach Based on Segmental-FFT for Code Fast Acquisition

2011 ◽  
Author(s):  
Hao Huan ◽  
Ran Tao
Keyword(s):  
Frequency Estimation ◽  
High Accuracy ◽  
Fast Acquisition

Design of Temperature Monitoring System Based on MSP430

2011 ◽  
Vol 301-303 ◽  
pp. 1162-1165
Author(s):  
Fei Hu ◽  
Wen Qing Yin ◽  
Cai Rong Chen
Keyword(s):  
Monitoring System ◽  
Simple Structure ◽  
High Accuracy ◽  
Temperature Monitoring ◽  
Low Power Consumption ◽  
Key Factors ◽  
Process Data ◽  
Long Distance ◽  
Fast Acquisition ◽  
Digital Temperature Sensor

The Greenhouse Temperature Is one of the Key Factors for Controlling the Growth of Crops. Traditional Methods of Temperature Monitoring Can Not Meet the Modern Greenhouse Requirements of High Accuracy, Fast Acquisition and Response. a Greenhouse Temperature Monitoring System Based on MSP430 Was Designed. this System Uses Digital Temperature Sensor DS18B20 to Measure Temperature, MSP430 to Process Data and Transmit Data to the Host Computer through RS485 Bus, Realizing the Real-Time Detection and Long-Distance Transmission of Greenhouse Temperature. this System Has the Features of Simple Structure, Low Power Consumption, Stability and Strong Portability Etc.

scholarly journals High-accuracy Photonics-assisted Frequency Measurement With Rough-accurate Compensation Based on Mach-Zehnder Interfering and Power Cancellation

2021 ◽  
Author(s):  
Lanfeng Huang ◽  
Yongjun Li ◽  
Shanghong Zhao ◽  
Tao Lin ◽  
Guodong Wang ◽  
...  
Keyword(s):  
Frequency Estimation ◽  
Frequency Measurement ◽  
High Accuracy ◽  
Optical Field ◽  
Comparison Function ◽  
Multiple Frequency ◽  
Frequency Identification ◽  
Mach Zehnder Modulator ◽  
Rf Signal ◽  
Polarization Division Multiplexing

Abstract A high-accuracy photonics-assisted frequency measurement with rough-accurate compensation based on Mach-Zehnder interfering and power cancellation is proposed. A polarization division multiplexing dual-parallel Mach–Zehnder modulator (PDM-DPMZM) is employed to mix the unknown RF signal and sweep signal to optical field. The rough measurement is firstly performed by the interference of a Mach-Zehnder interferometer (MZI) to realize fast frequency estimation. Then, based on the rough measurement result, the accurate measurement based on power cancellation is implemented in a much narrower range, which greatly improves the efficiency of frequency measurement. The simulation results show that the amplitude comparison function (ACF) established by interference can achieve a measurement error of less than 0.3 GHz over 0.5 ~39 GHz. Moreover, thanks to the rough-accurate compensation, the accuracy can be further improved to 4 MHz. Additionally, the multiple frequency identification with a resolution of 10 MHz can also be achieved based on this system.

scholarly journals Multi-Tone Frequency Estimation Based on the All-Phase Discrete Fourier Transform and Chinese Remainder Theorem

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5066
Author(s):  
Xiangdong Huang ◽  
Lu Cao ◽  
Wei Lu
Keyword(s):  
Fourier Transform ◽  
Closed Form ◽  
Discrete Fourier Transform ◽  
High Efficiency ◽  
Chinese Remainder Theorem ◽  
Frequency Estimation ◽  
High Accuracy ◽  
Single Frequency ◽  
Tone Frequency ◽  
Spectrum Correction

The closed-form robust Chinese Remainder Theorem (CRT) is a powerful approach to achieve single-frequency estimation from noisy undersampled waveforms. However, the difficulty of CRT-based methods’ extension into the multi-tone case lies in the fact it is complicated to explore the mapping relationship between an individual tone and its corresponding remainders. This work deals with this intractable issue by means of decomposing the desired multi-tone estimator into several single-tone estimators. Firstly, high-accuracy harmonic remainders are calculated by applying all-phase Discrete Fourier Transform (apDFT) and spectrum correction operations on the undersampled waveforms. Secondly, the aforementioned mapping relationship is built up by a novel frequency classifier which fully captures the amplitude and phase features of remainders. Finally, the frequencies are estimated one by one through directly applying the closed-form robust CRT into these remainder groups. Due to all the components (including closed-form CRT, the apDFT, the spectrum corrector and the remainder classifier) only involving slight computation complexity, the proposed scheme is of high efficiency and consumes low hardware cost. Moreover, numeral results also show that the proposed method possesses high accuracy.

High-accuracy Frequency Estimation Synthetic Algorithm in Laser Doppler Velocity Radar

2011 ◽  
Vol 33 (7) ◽  
pp. 1689-1693 ◽  
Author(s):  
De-zhao Yang ◽  
Pan Ou ◽  
Zhi-li Lin ◽  
Ning-fang Song
Keyword(s):  
Frequency Estimation ◽  
High Accuracy ◽  
Laser Doppler ◽  
Doppler Velocity
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