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Instantaneous Frequency-Measuring Receivers (Letters)
IEEE Transactions on Microwave Theory and Techniques, 1972The instantaneous frequency-measuring receiver (IFR) is becoming widely known to microwaye systems engineers, but as a consequence of the defense applications its origins are obscure. The pioneering work on the phase-discriminator technique, which is the basis of most modern IFR systems, was done in the Mullard Research Laboratories, Red Hill, Surrey ...
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A photonics-assisted instantaneous frequency measurement receiver
2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), 2017Measuring the instantaneous frequency accurately of a signal takes a critical effect on many fields such as radio detection, navigation and so on. Considering signal density is large, time domain overlap is serious and the frequency coverage is wide in the modern electronic warfare environment, it is claimed that the frequency measurement is not only ...
Chunjie Zhang +2 more
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Frequency relaying based on instantaneous frequency measurement [power systems]
IEEE Transactions on Power Delivery, 1996A frequency relay capable of under/over frequency and rate of change of frequency measurements has been implemented on a digital signal processor using an instantaneous frequency measuring algorithm. Careful attention to the filtering aspects of the relay is needed under dynamic conditions due to frequency modulation of the input signal.
P.J. Moore, J.H. Allmeling, A.T. Johns
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Instantaneous frequency measurement based on EMD and TVAR
IEEE 2011 10th International Conference on Electronic Measurement & Instruments, 2011Instantaneous frequency (IF) is an important parameter in the study of non- stationary single, when instantaneous frequency is measured accurately, it has great application in electric power system single analyze, intelligent trouble diagnosis and so on.
null Zhou Yun +3 more
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Instantaneous Frequency of the EEG as a Stress Measure - A Preliminary Research
2021Stress is one of the most common factors of everyday life. There is a plethora of different measures used to determine the physiological responses to stress. One of the most commonly used is the electroencephalogram (EEG). Power of various frequency bands in the EEG is often correlated with mental states of the measured subject.
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Measurement of Instantaneous Frequency with a Microwave Interferometer
Proceedings of the IRE, 1957A microwave interferometer for the measurement of instantaneous frequency is described. It consists of a transmission line circuit used as a frequency modulation discriminator, and an indicator consisting of a microwave detector, video amplifier, and oscilloscope.
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Photonic Assisted Broadband Instantaneous Frequency Measurement
Asia Communications and Photonics Conference 2014, 2014The instantaneous microwave frequency measurement with amplitude comparison functions is proposed and experimentally demonstrated. From the proof-of-concept experiment, the measurement error is smaller than ±150 MHz in the frequency range of 1–20 GHz.
Nuannuan Shi +6 more
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Instantaneous microwave frequency measurement with improved resolution
Optics Communications, 2015Abstract An approach of instantaneous microwave frequency measurement with improved resolution is proposed and analyzed. The primary component employed in the proposal is a polarization modulator (PolM) followed by a linear polarizer (LP) and a spool of dispersive fiber. To obtain a flexible amplitude comparison function (ACF), the polarization state
Yueqin Li +6 more
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Multiple frequencies analysis in FBG based instantaneous frequency measurements
2018 Systems of Signals Generating and Processing in the Field of on Board Communications, 2018This article describes the design principles of instantaneous frequency measurement system of microwave signals based on the use of amplitude-phase modulation conversion of single optical carrier into symmetrical dual-frequency ones for additional frequency separation according its wavelength range, and same its modulation by unknown frequency and ...
Airat J. Sakhabutdinov +3 more
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Measurement of “instantaneous” carrier frequency of bat pulses
The Journal of the Acoustical Society of America, 1973A technique is presented for the precise measurement of the “instantaneous” carrier frequency of bat pulses. An augmented commercial frequency counter is used to measure the period (or a short-term period average) of the bat pulse carrier. An expanded scale readout from the frequency counter is obtained via digital-to-analog conversion, yielding a ...
P. J. Kindlmann +5 more
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