High-speed spectrum analyser using a pulse-compression technique

1967 ◽  
Vol 114 (11) ◽  
pp. 1613 ◽  
Author(s):  
J.A. Edwards ◽  
M.J. Withers
Keyword(s):  
High Speed ◽  
Pulse Compression ◽  
Compression Technique ◽  
Spectrum Analyser

A review of radar signals in terms of Doppler tolerance, time-sidelobe level, and immunity against jamming

2018 ◽  
Vol 10 (10) ◽  
pp. 1134-1142 ◽  
Author(s):  
Samer Baher Safa Hanbali
Keyword(s):  
High Speed ◽  
Pulse Compression ◽  
Power Transmission ◽  
Short Pulse ◽  
Radar Signal ◽  
Sidelobe Level ◽  
Compression Technique ◽  
Electronic Warfare ◽  
Tolerance Time ◽  
Radar Signals

AbstractPulse compression technique allows a radar to achieve the resolution of a short pulse and the energy of a long pulse simultaneously, without the requirement of high-power transmission. Therefore, pulse compression radars have a low probability of intercept capability. The common types of pulse compression signals are frequency modulated waveforms and phase-coded waveforms, which have different properties. The optimum radar signal should have good immunity against deceptive jamming, good Doppler tolerance to detect high-speed targets, and low time-sidelobe level to detect weak targets nearby the strong ones. This paper reviews the current research in the commonly used radar signals, and presents their pros and cons, and compares between them in terms of Doppler tolerance, time-sidelobe level, as well as immunity against jamming in order to provide a reference for the researchers in the field of radar systems and electronic warfare.

scholarly journals New broadband methods for resonance classification and high-resolution imagery of fish with swimbladders using a modified commercial broadband echosounder

2010 ◽  
Vol 67 (2) ◽  
pp. 365-378 ◽  
Author(s):  
Timothy K. Stanton ◽  
Dezhang Chu ◽  
J. Michael Jech ◽  
James D. Irish
Keyword(s):  
High Resolution ◽  
Pulse Compression ◽  
Target Strength ◽  
Compression Technique ◽  
Range Resolution ◽  
High Resolution Imagery ◽  
Broadband Signal ◽  
Scattering Strength ◽  
Broadband Signal Processing ◽  
Lower Frequencies

Abstract Stanton, T. K., Chu, D., Jech, J. M., and Irish, J. D. 2010. New broadband methods for resonance classification and high-resolution imagery of fish with swimbladders using a modified commercial broadband echosounder. – ICES Journal of Marine Science, 67: 365–378. A commercial acoustic system, originally designed for seafloor applications, has been adapted for studying fish with swimbladders. The towed system contains broadband acoustic channels collectively spanning the frequency range 1.7–100 kHz, with some gaps. Using a pulse-compression technique, the range resolution of the echoes is ∼20 and 3 cm in the lower and upper ranges of the frequencies, respectively, allowing high-resolution imaging of patches and resolving fish near the seafloor. Measuring the swimbladder resonance at the lower frequencies eliminates major ambiguities normally associated with the interpretation of fish echo data: (i) the resonance frequency can be used to estimate the volume of the swimbladder (inferring the size of fish), and (ii) signals at the lower frequencies do not depend strongly on the orientation of the fish. At-sea studies of Atlantic herring demonstrate the potential for routine measurements of fish size and density, with significant improvements in accuracy over traditional high-frequency narrowband echosounders. The system also detected patches of scatterers, presumably zooplankton, at the higher frequencies. New techniques for quantitative use of broadband systems are presented, including broadband calibration and relating target strength and volume-scattering strength to quantities associated with broadband signal processing.

scholarly journals A Comparison between off and On-Chip Injection Locking in a Photonic Integrated Circuit

Photonics ◽  
2019 ◽  
Vol 6 (4) ◽  
pp. 103 ◽  
Author(s):  
Alison Perrott ◽  
Ludovic Caro ◽  
Mohamad Dernaika ◽  
Frank Peters
Keyword(s):  
Integrated Circuit ◽  
High Speed ◽  
Power Spectra ◽  
Dynamical Behaviour ◽  
Injection Locking ◽  
Semiconductor Diode ◽  
Photonic Integrated Circuit ◽  
Semiconductor Diode Laser ◽  
Spectrum Analyser ◽  
On Chip

The mutual and injection locking characteristics of two integrated lasers are compared, both on and off-chip. In this study, two integrated single facet slotted Fabry–Pérot lasers are utilised to develop the measurement technique used to examine the different operational regimes arising from optically locking a semiconductor diode laser. The technique employed used an optical spectrum analyser (OSA), an electrical spectrum analyser (ESA) and a high speed oscilloscope (HSO). The wavelengths of the lasers are measured on the OSA and the selected optical mode for locking is identified. The region of injection locking and various other regions of dynamical behaviour between the lasers are observed on the ESA. The time trace information of the system is obtained from the HSO and performing the FFT (Fast Fourier Transform) of the time traces returns the power spectra. Using these tools, the similarities and differences between off-chip injection locking with an isolator, and on-chip mutual locking are examined.

The Pulse-Compression Technique

1977 ◽  
Vol 18 (4) ◽  
pp. 183-187
Author(s):  
G. Ethirajulu
Keyword(s):  
Pulse Compression ◽  
Compression Technique

Generation of high energy 10 fs pulses by a new pulse compression technique

1996 ◽  
Vol 68 (20) ◽  
pp. 2793-2795 ◽  
Author(s):  
M. Nisoli ◽  
S. De Silvestri ◽  
O. Svelto
Keyword(s):  
Pulse Compression ◽  
High Energy ◽  
Compression Technique
Sign in / Sign up

Export Citation Format

Share Document