Stochastic resonance induced by an unknown linear frequency modulated signal in a strong noise background.
Sign Up to like & getrecommendations! Published in 2020 at "Chaos"
DOI: 10.1063/5.0002134
Abstract: Stochastic resonance (SR) is widely used as a signal enhancement technique in recovering and enhancing periodic or aperiodic signals submerged in noise. However, system parameters and noise intensity tend to influence the SR performance. To… read more here.
Keywords: frequency modulated; resonance; stochastic resonance; lfm signal ... See more keywords
Multiple Targets Detection of Linear Frequency-Modulated Continuous Wave Active Sonar Using Fractional Fourier Transform
Sign Up to like & getrecommendations! Published in 2020 at "Integrated Ferroelectrics"
DOI: 10.1080/10584587.2020.1728798
Abstract: Abstract In order to improve the detection performance of active sonar and make up for the shortcomings of pulsed active sonar (PAS), linear frequency-modulated continuous wave (LFMCW) was applied in continuous active sonar (CAS). The… read more here.
Keywords: frequency modulated; sonar; linear frequency; modulated continuous ... See more keywords
Simultaneous range ambiguity mitigation and sidelobe reduction using orthogonal non-linear frequency modulated (ONLFM) signals for satellite SAR Imaging
Sign Up to like & getrecommendations! Published in 2018 at "Remote Sensing Letters"
DOI: 10.1080/2150704x.2018.1486518
Abstract: ABSTRACT This letter first attempts to simultaneously reduce range ambiguities and sidelobes in spaceborne synthetic aperture radar (SAR). Two of the limitations of SAR are the range ambiguity phenomenon and the sidelobes effect. The range… read more here.
Keywords: frequency modulated; linear frequency; range ambiguity; range ... See more keywords
Photonic Generation of Linear-Frequency-Modulated Waveforms With Improved Time-Bandwidth Product Based on Polarization Modulation
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Lightwave Technology"
DOI: 10.1109/jlt.2017.2651902
Abstract: Polarization modulation of two phase-correlated, orthogonally polarized wavelengths by a parabolic waveform is a promising way to generate linear-frequency-modulated (LFM) signals, but the time-bandwidth product (TBWP) of the generated LFM signal is intrinsically limited by… read more here.
Keywords: modulation; frequency modulated; polarization modulation; polarization ... See more keywords
Non-Linear Frequency Noise Modulation in a Resonant MEMS Accelerometer
Sign Up to like & getrecommendations! Published in 2017 at "IEEE Sensors Journal"
DOI: 10.1109/jsen.2017.2703156
Abstract: Resonant MEMS accelerometers offer the potential for very high resolution and wide bandwidth measurements over a large input dynamic range. The read-out is implemented by constructing an oscillator with the resonator as the primary frequency… read more here.
Keywords: resonant mems; modulation; frequency; non linear ... See more keywords
The Optimal Linear Canonical Wigner Distribution of Noisy Linear Frequency-Modulated Signals
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Signal Processing Letters"
DOI: 10.1109/lsp.2019.2922510
Abstract: A qualitative analysis to the output signal-to-noise ratio (SNR) optimization modeling and solving of Wigner distribution in linear canonical transform (LCT) domains is introduced. Within the well-established output SNR optimization model analysis framework, the strategies… read more here.
Keywords: linear canonical; wigner distribution; linear frequency; frequency modulated ... See more keywords
Direction Finding of Linear Frequency Modulation Signal With Time-Modulated Array
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Transactions on Antennas and Propagation"
DOI: 10.1109/tap.2018.2863252
Abstract: This communication proposes a novel method for finding the direction of the linear frequency modulation (LFM) signal, which has a bandwidth that is much larger than that of the modulated frequency, based on the time-modulated… read more here.
Keywords: time; frequency modulation; frequency; modulated array ... See more keywords
High precision linear frequency modulation ranging system based on semiconductor laser
Sign Up to like & getrecommendations! Published in 2018 at "Modern Physics Letters B"
DOI: 10.1142/s0217984918501361
Abstract: Based on the linear frequency modulation (LFM) of semiconductor laser, a laser ranging system is built. The ranging precision of the system is about micron dimension with the repetition frequency o... read more here.
Keywords: laser; system; semiconductor laser; frequency ... See more keywords
FDA-MIMO Beampattern Synthesis with Hamming Window Weighted Linear Frequency Increments
Sign Up to like & getrecommendations! Published in 2020 at "International Journal of Aerospace Engineering"
DOI: 10.1155/2020/4851909
Abstract: By utilizing a tiny frequency increment across the array elements, frequency diverse array (FDA) generates a beampattern possessing the property of range-angle-dependent. However, the beampattern of the conventional FDA is “S”-shaped, which means it is… read more here.
Keywords: window weighted; frequency; frequency increments; weighted linear ... See more keywords
Generation of linear frequency-modulated signals with improved time-bandwidth product based on an optical frequency comb.
Sign Up to like & getrecommendations! Published in 2019 at "Applied optics"
DOI: 10.1364/ao.58.003222
Abstract: A generation scheme for the linear frequency-modulated (LFM) signals with tunable carrier frequency and improved time-bandwidth product (TBWP) using an optical frequency comb (OFC) and a fiber Bragg grating (FBG) time delay line is proposed… read more here.
Keywords: time; improved time; frequency; line ... See more keywords