Precise frequency linking method based on phase group synchronization

Du, B. X.; Dongyao, Zuo; Feng, Da‐Zheng; Geng, Xiurui; Xi, Guangyong; Yang, Zhigang

doi:10.1016/j.measurement.2014.11.016

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…To date, many scholars have put forward some optimization methods based on the multicycle synchronization, such as the complete synchronization method [13] and the phase group synchronization method [14][15][16][17]. These two methods synchronize the measurement gate signal, the standard signal and the measured signal to minimize the error.…”

Section: Jinst 16 P06001mentioning

confidence: 99%

A high-accuracy and non-intermittent frequency measurement method for Larmor signal of optically pumped cesium magnetometer

Dong¹,

Xue²,

Luo³

et al. 2021

J. Inst.

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The optically pumped cesium magnetometer is a quantum magnetometer based on the Zeeman effect. The frequency of the output Larmor signal is proportional to the magnetic field intensity. Therefore, improving the measurement accuracy of the Larmor frequency can make the magnetic field measurement more accurate. However, the Larmor signal is easily coupled with various randomly distributed noises, which will generate an unavoidable trigger error. To address the above problem, we propose a multi-gate and equal-precision fusion method. In this method, the trigger error is averaged into the count of each small gate through the multi-gate structure to improve the frequency measurement accuracy and the continuous sampling performance. We implemented this method on the FPGA and conducted indoor and outdoor experiments. The experimental results show that this method not only improves the measurement accuracy by three times of the traditional method, but also enhances the stability and noise suppression ability of the system, and can provide technical and instrumental support for magnetic field measurement projects.

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Section: Jinst 16 P06001mentioning

confidence: 99%

A high-accuracy and non-intermittent frequency measurement method for Larmor signal of optically pumped cesium magnetometer

Dong¹,

Xue²,

Luo³

et al. 2021

J. Inst.

View full text Add to dashboard Cite

show abstract

“…At present, no major breakthrough has been made in the high-precision frequency measurement methods. Traditional measurement methods (such as multi-period synchronization, direct counting, analog interpolation, and cursor method) mainly rely on the microelectronics manufacturing process to improve measurement accuracy, but the room for improvement is very limited [3,4]. The direct count method and the multi-period synchronization method are only suitable for low-frequency signals.…”

Section: Introductionmentioning

confidence: 99%

“…The high-precision frequency measurement method based on the phase quantization of different-frequency signal groups uses the periodic law of the phase relationship between signals to solve the problems in the traditional frequency measurement method in principle. With the adoption of FPGA on-chip technology, the circuit structure is simplified and the measurement accuracy and stability are improved [1][2][3][4]. As the phase coincidence pulse of the standard frequency signals and the measured signals trigger the measurement gate, the gate signal is synchronized with the frequency standard and the measured signal, and the count error of ±1 character in the traditional method can be overcome.…”

Section: Introductionmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Geng

2022

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In order to achieve higher frequency measurement accuracy, this paper proposed a characteristic pulse detection method of fuzzy area based on the quantized phase processing method of different frequency groups. First, the fuzzy area of the group phase coincidence points continuously moved on the time axis after passing through delay elements. The moving distance, that is, the number of the delay elements was determined by the main clock cycle of the D flip-flop. After that, three groups of phase coincidence detection fuzzy areas in different positions were sent to the digital logic module to extract the edge pulses of the phase coincidence detection fuzzy area. The pulse width is determined by the difference between the clock cycles of the delay elements. The clock cycles of different delay units were adjusted to obtain nanosecond or even picosecond circuit detection resolution. Finally, the pulses generated at the edge of the phase coincidence fuzzy area are taken as the switching signal of the frequency signal counter, so the stability of the gate signal and the accuracy of the gate time measurement are improved. The experimental results show that frequency stability can reach the order of E-13/s. In addition, compared with the traditional measurement method, it is characterized by simple structure, low cost, low noises, and high measurement resolution.

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Doppler frequency shift measurement and direction discrimination based on a bidirectional phase modulator and a Sagnac loop

Chen

Shang

et al. 2021

Optik

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Precise frequency linking method based on phase group synchronization

Cited by 5 publications

References 12 publications

A high-accuracy and non-intermittent frequency measurement method for Larmor signal of optically pumped cesium magnetometer

A high-accuracy and non-intermittent frequency measurement method for Larmor signal of optically pumped cesium magnetometer

Bulletin of the Polish Academy of Sciences: Technical Sciences

Doppler frequency shift measurement and direction discrimination based on a bidirectional phase modulator and a Sagnac loop

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