Results 1 to 10 of about 37,322 (294)

Photonic instantaneous frequency measurement of wideband microwave signals. [PDF]

PLoS ONE, 2017
We propose a photonic system for instantaneous frequency measurement (IFM) of wideband microwave signals with a tunable measurement range and resolution based on a polarization-maintaining fiber Bragg grating (PM-FBG). Firstly, in order to be insensitive
Yueqin Li, Li Pei, Jing Li, Yiqun Wang, Jin Yuan, Tigang Ning   +5 more
doaj   +6 more sources

Power-Independent Microwave Photonic Instantaneous Frequency Measurement System [PDF]

Sensors
The ability to perform instantaneous frequency measurement (IFM) of unknown microwave signals holds significant importance across various application domains. This paper presents a power-independent microwave photonic IFM system.
Ruiqiong Wang, Yongjun Li
doaj   +4 more sources

Photonic-Assisted Receivers for Instantaneous Microwave Frequency Measurement Based on Discriminators of Resonance Type

Photonics, 2022
Photonic-assisted receivers for instantaneous microwave frequency measurement are devices used to measure the instantaneous frequency and amplitude of one or more microwave signals in the optical range, typically used in radar systems.
Alexander Ivanov, Oleg Morozov, Airat Sakhabutdinov, Artem Kuznetsov, Ilnur Nureev   +4 more
doaj   +4 more sources

Instantaneous Frequency Measurement with Reasonable Resolution and Simple Structure

Photonics, 2022
Microwave signals carry important intelligence information in electronic warfare. Hence, the measurement of microwave signals plays a very important role.
Qing-An Ding, Junkai Li, Huixin Liu, Xudong Cheng, Anhui Liang, Liuge Du, Li Zheng, Zhenfei Dai, Qunying Yang, Jun Li   +9 more
doaj   +2 more sources

Machine-Learning-Assisted Instantaneous Frequency Measurement Method Based on Thin-Film Lithium Niobate on an Insulator Phase Modulator for Radar Detection [PDF]

Sensors
A simple microwave photonic, reconfigurable, instantaneous frequency measurement system based on low-voltage thin-film lithium niobate on an insulator phase modulator is put forward and experimentally demonstrated.
Qianqian Jia, Zichuan Xiang, Dechen Li, Jianguo Liu, Jinye Li   +4 more
doaj   +2 more sources

Instantaneous Frequency Estimation Algorithm for Power Systems [PDF]

JES: Journal of Engineering Sciences, 2022
This paper deals with the problem of the Instantaneous Frequency (IF) estimation of power systems, to be adopted for example in Phasor Measurement Units (PMUs) used for monitoring, control, and protection.
Christina Aziz, Hany Girgis, Mohamed Nayel   +2 more
doaj   +2 more sources

Problem of the instantaneous sound frequency measurement

Archives of Acoustics, 2015
This paper presents a method for the measurement of the so - called quasi-instantaneous frequency of acoustic signals, which is an approximation of the instantaneous frequency defined on the basis of theoretical considerations.
Edward OZIMEK, Lech JUGOWAR, Leon RUTKOWSKI   +2 more
doaj   +1 more source

Fifty years of instantaneous frequency measurement

IET Radar, Sonar and Navigation, 2012
Quadrature phase discriminators, the core of wideband instantaneous frequency measurement (IFM) receivers and multiple base-line interferometry for accurate direction finding (DF), were invented in 1957, by S.J. Robinson of Mullard Research Laboratories (MRL).
exaly   +2 more sources

Wideband High-Speed and High-Accuracy Instantaneous Frequency Measurement System

IEEE Photonics Journal, 2023
A new photonic-assisted instantaneous frequency measurement system is presented. It overcomes the latency problem in the reported structures based on the frequency-to-time mapping technique or the frequency-to-power mapping technique that involves a long
Chongjia Huang, Erwin Hoi Wing Chan, Peng Hao, Xudong Wang   +3 more
doaj   +1 more source

Implementation of an Adaptive Method for Changing the Frequency Division of the Counter Clock Signal in a Frequency-to-Code Converter

Energies, 2023
Processing physical quantities into an indirect signal is a standard method of transferring information about the measured quantity to the master system, which analyzes the data obtained from the acquisition system.
Dariusz Świsulski, Piotr Warda
doaj   +1 more source