Interrogation Signal Generation for SAW Temperature Sensor

2013 ◽  
Vol 694-697 ◽  
pp. 1089-1092
Author(s):  
Theng Wei Lee ◽  
Wan Young Chung
Keyword(s):  
Pulse Compression ◽  
Continuous Wave ◽  
Reference Signal ◽  
Phase Lock Loop ◽  
Matlab Simulation ◽  
Waveform Generator ◽  
Compression Technique ◽  
Range Resolution ◽  
Saw Sensor ◽  
Arbitrary Waveform

This paper presents the method to generate frequency modulated continuous wave (FMCW) interrogation signal by using a phase lock loop (PLL) transmitter and NI ELVIS development board. The FMCW interrogation signal can be used for measuring temperature from a surface acoustic wave (SAW) sensor. The development of the PLL transmitter is discussed. The Arbitrary Waveform Generator of NI ELVIS is utilized for generating a linear frequency sweep reference signal, which will be used as a stable input signal for the transmitter. A MATLAB simulation using a pulse compression technique is performed to investigate the relationship between the FMCW bandwidth and range resolution.

scholarly journals Implementation of Stepped Frequency Modulation Pulse Compression on NI Suite

2019 ◽  
Vol 9 (2) ◽  
pp. 2161-2164
Keyword(s):  
Frequency Modulation ◽  
Pulse Compression ◽  
Continuous Wave ◽  
Short Pulse ◽  
Compression Technique ◽  
Range Resolution ◽  
Wide Range ◽  
Stepped Frequency ◽  
Long Pulse ◽  
Design And Testing

In Radars and Sonar, the pulse compression technique is used continuously to increase the range resolution, range detection and the signal-to noise ratio (SNR). This can be achieved by modulating the transmitted pulse and then correlating it to the received pulse with the transmitted signal. This transforms short pulse into long pulse and is used to increase long pulse bandwidth by some form of modulation such as linear frequency modulation (LFM), so that Range Resolution is not compromised. The proposed Stepped Frequency Modulation (SFM) is a common Pulse Compression Method, which is useful to increase the Radar Range Resolution without losing the capability of target detection. Step Frequency Continuous Wave (SFCW) is also one of the techniques used in the Pulse Compression Technique, where the return echo step is used to determine range and is used for different purposes. This type of setup is widely used in RADAR design and testing. This Paper proposes the implementation of various Modulation techniques such as LFM, SFM and SFCW for proposed Stepped frequency Modulation using NI suite hardware PXI system which has a configurable FPGA and RF front end to generate custom waveform in wide range of frequencies with bandwidth up to 1GHz design and testing.

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 Implementation of Multi-Objective Grey Wolf Optimizer to Minimize The Sidelobes And Reduce Mainlobe Width

2018 ◽  
Vol 7 (2.20) ◽  
pp. 219
Author(s):  
K Ravi Kumar ◽  
Prof. P. Rajesh Kumar
Keyword(s):  
Frequency Modulation ◽  
Pulse Compression ◽  
Matched Filter ◽  
High Energy ◽  
Grey Wolf Optimizer ◽  
Grey Wolf ◽  
Compression Technique ◽  
Range Resolution ◽  
Multi Objective ◽  
Small Targets

Range resolution in radar can be achieved by splitting the long pulse of high energy into the high bandwidth of short pulses using pulse compression technique. Frequency modulation (Linear frequency modulation (LFM)) signal is used to improve range resolution. To get better range resolution, frequency step is introduced between a train of LFM pulses known as stepped frequency pulse train (the SFPT). The SFPT suffers from grating lobes when the product of sub-pulse duration and frequency step becomes more than one. The grating lobes and sidelobes present in the vicinity of the mainlobe. It can cause the false alarm detection and hide the small targets. In this work, Multi-Objective Grey Wolf Algorithm (MOGWO) is used to set the parameters of SFPT to mitigate the grating lobes and minimize the sidelobes at the matched filter output. Trade-off solutions between sidelobes versus grating lobes and mainlobe width versus sidelobes are obtained using the Pareto front for different ranges of SFPT parameters.  

Fiber Bragg Grating Sensor Multiplexing System Based on FMCW

2013 ◽  
Vol 336-338 ◽  
pp. 232-238
Author(s):  
Li Wen Sheng ◽  
Yan Ling Xiong ◽  
Wen Long Yang ◽  
Shuo Duo Li ◽  
Xue Ming Jin ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Continuous Wave ◽  
Experimental System ◽  
Bragg Grating ◽  
Waveform Generator ◽  
Position Information ◽  
Scanning Time ◽  
Arbitrary Waveform ◽  
Distributed Optical Fiber ◽  
Bragg Grating Sensor

The addressing principle of distributed optical fiber Bragg grating (FBG) sensor based on frequency modulation continuous wave (FMCW) multiplexing technology was studied. The effect of grating position information, scanning time and scanning frequency range on the spectrum signals was analyzed by simulation. The FMCW multiplexing system, which was composed of the arbitrary waveform generator, light intensity modulator and multiplier etc, was established and the certifications were delivered by the experimental system.

scholarly journals Design and Implementation Pulse Compression for S-Band Surveillance Radar

2020 ◽  
Vol 7 (1) ◽  
pp. 20
Author(s):  
Kalfika Yani ◽  
Fiky Y Suratman ◽  
Koredianto Usman
Keyword(s):  
Signal Processing ◽  
High Speed ◽  
Pulse Compression ◽  
Continuous Wave ◽  
Radar Signal ◽  
Radar Signal Processing ◽  
Digital Platform ◽  
Range Resolution ◽  
Pulse Compression Radar ◽  
Cw Radar

The radar air surveillance system consists of 4 main parts, there are antenna, RF front-end, radar signal processing, and radar data processing. Radar signal processing starts from the baseband to IF section. The radar waveform consists of two types of signal, there are continuous wave (CW) radar, and pulse compression radar [1]. Range resolution for a given radar can be significantly improved by using very short pulses. Pulse compression allows us to achieve the average transmitted power of a relatively long pulse, while obtaining the range resolution corresponding to a short pulse. Pulse compression have compression gain. With the same power, pulse compression radar can transmit signal further than CW radar. In the modern radar, waveform is implemented in digital platform. With digital platform, the radar waveform can optimize without develop the new hardware platform. Field Programmable Gate Array (FPGA) is the best platform to implemented radar signal processing, because FPGA have ability to work in high speed data rate and parallel processing. In this research, we design radar signal processing from baseband to IF using Xilinx ML-605 Virtex-6 platform which combined with FMC-150 high speed ADC/DAC.

scholarly journals X-Band Photonic-Based Pulsed Radar Architecture with a High Range Resolution

2020 ◽  
Vol 10 (18) ◽  
pp. 6558
Author(s):  
Youngseok Bae ◽  
Minwoo Yi ◽  
Jinwoo Shin ◽  
Sang-Gug Lee
Keyword(s):  
Continuous Wave ◽  
Optical Switch ◽  
Pulse Repetition Frequency ◽  
Error Rates ◽  
Center Frequency ◽  
Waveform Generator ◽  
Range Resolution ◽  
Fmcw Radar ◽  
X Band ◽  
High Range

In this paper, we propose an X-band photonic-based pulsed radar architecture with a high range resolution. The proposed architecture is operated as a pulsed radar by adding a Mach-Zehnder modulator (MZM) operating as an optical switch to a transmitter of a conventional photonic-based frequency-modulated continuous wave (FMCW) radar. In addition, a balanced photodetector (BPD) is employed to enhance the amplitude of the received signal and remove common-mode noise. A proposed photonic-based pulsed radar prototype is implemented to operate at a center frequency of 10 GHz, a bandwidth of 640 MHz, and a pulse repetition frequency (PRF) of 1 kHz considering the performances of an arbitrary waveform generator (AWG). The implemented prototype is verified through an indoor experiment. As a result, the positions of targets are detected in real-time with 1.6% error rates of a range accuracy and obtained the range resolution of 0.26 m.

Feasibility of low-frequency directive sound source with high range resolution using pulse compression technique

2014 ◽  
Vol 53 (7S) ◽  
pp. 07KC03 ◽  
Author(s):  
Hideyuki Noumura ◽  
Hideo Adachi ◽  
Tomoo Kamakura ◽  
Gregory T. Clement
Keyword(s):  
Sound Source ◽  
Pulse Compression ◽  
Low Frequency ◽  
Compression Technique ◽  
Range Resolution ◽  
High Range
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