Fractional-N PLL Synthesizer for FMCW Signal Generator with Dual-Mode Modulation Pattern

Radar signal generator is a critical component in radar system as it determines the best achievable resolution. Single chip Fractional-N PLL synthesizer with built-in VCO and sweep modulator become more popular as Frequency Modulated Continuous Wave (FMCW) signal generator due to the simplicity and overall cost reduction. This paper presents a realization process and experimental result of dual-mode modulation pattern FMCW signal generator using HMC769LP6CE PLL. The PLL is controlled by ATMega328 microcontroller and Altera EPM240T100C5 CPLD to operate in two difference mode: 1-way sweep mode and 2-way sweep mode. The PLL is programmed with four different sweep bandwidth from 6.75–54 MHz for different range and resolution radar purpose. The performance of FMCW signal generator is measured using the output of passband signal spectrum. The experimental results indicate that the PLL-VCO with 2-way sweep mode has clearer frequency passband compared to 1-way sweep mode.

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Fractional-N PLL Synthesizer for linear FMCW Radar Signal Generator

2016 10th International Conference on Telecommunication Systems Services and Applications (TSSA) ◽

10.1109/tssa.2016.7871083 ◽

2016 ◽

Cited By ~ 2

Author(s):

Ratna Indrawijaya ◽

Dayat Kurniawan ◽

Ros Sariningrum ◽

Dadan Muliawandana ◽

Bagus Edi Sukoco

Keyword(s):

Signal Generator ◽

Radar Signal ◽

Fmcw Radar ◽

Pll Synthesizer

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A High Speed and Ultra Long-Haul Radio-Over-Fiber System Employing Dual Photoelectric Arms Coherent Modulation and Optical Duo-Binary Coding

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.988.544 ◽

2014 ◽

Vol 988 ◽

pp. 544-547

Author(s):

Guang Li

Keyword(s):

High Speed ◽

Continuous Wave ◽

Single Mode ◽

Fiber Amplifier ◽

Radio Over Fiber ◽

Laser Source ◽

Signal Spectrum ◽

Fiber System ◽

Binary Coding ◽

Coherent Modulation

A novel high speed and ultra long-haul radio-over-fiber (ROF) system based on Dual Photoelectric Arms Coherent Modulation (DPACM) and Optical Duo-Binary Coding (ODBC) is proposed, and demonstrated. The signal spectrum bandwidth, generated by ODBC based on the first order DPACM, is half of non-return-to-zero (NRZ ) signal spectrum bandwidth. The secondary order DPACM generates a 40-GHz Millimeter-wave (mm-wave) that is transmitted over fiber (ROF). The simulation results show that, the bit rate can be up to 40 Gbps and the transmission distance is over 1500 Km, based on the ROF system with a 0 dBm continuous-wave laser source, multiple stages Er-Doped Fiber Amplifier (EDFA), a standard single mode fiber (SSMF) with a dispersion of 17 ps/nm/Km and a attenuation of 0.2 dB/Km.

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Application of Radar Signal Spectrum Width Estimation to Detect Vertical Airflows

Russian Meteorology and Hydrology ◽

10.3103/s1068373920120092 ◽

2020 ◽

Vol 45 (12) ◽

pp. 876-880

Author(s):

D. A. Denisenkov ◽

V. Yu. Zhukov ◽

Yu. V. Kuleshov ◽

G. G. Shchukin

Keyword(s):

Radar Signal ◽

Signal Spectrum ◽

Spectrum Width

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1.5-W 520 nm Continuous-wave Output from a 50μm/0.22NA Fiber-Coupled Laser Diode Module

10.21203/rs.3.rs-175061/v1 ◽

2021 ◽

Author(s):

Bojie Lou ◽

Bing Ding ◽

Zhangwang Miao ◽

Pengfei Zhao ◽

Haijuan Yu ◽

...

Keyword(s):

Conversion Efficiency ◽

Continuous Wave ◽

Numerical Aperture ◽

Experimental Result ◽

Optical Conversion Efficiency ◽

Core Diameter ◽

Central Wavelength ◽

High Brightness ◽

Optical Conversion ◽

Final Output

Abstract In this paper, a high brightness fiber-coupled module with a central wavelength of 520nm is simulated and designed by ray-tracing software ZEMAX, and then is experimentally implemented. Three 1-w continuous-wave green LD single emitters based on TO-9-package are successively collimated, spatially combined, and focused into an optical fiber with a core diameter of 50 μm and a numerical aperture of 0.22. The final output power of 1.53w is obtained, corresponding to an optical-optical conversion efficiency of 51% and an electro-optical conversion efficiency of 10%, and the tolerance between the simulation and the experimental result is analyzed and explained.

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FPGA Implementation of an Efficient FFT Processor for FMCW Radar Signal Processing

Sensors ◽

10.3390/s21196443 ◽

2021 ◽

Vol 21 (19) ◽

pp. 6443

Author(s):

Jinmoo Heo ◽

Yongchul Jung ◽

Seongjoo Lee ◽

Yunho Jung

Keyword(s):

Signal Processing ◽

Detection Rate ◽

Continuous Wave ◽

Vital Signs ◽

Radar Signal ◽

Radar Signal Processing ◽

Fmcw Radar ◽

Design And Implementation ◽

Fft Processor ◽

Point Operator

This paper presents the design and implementation results of an efficient fast Fourier transform (FFT) processor for frequency-modulated continuous wave (FMCW) radar signal processing. The proposed FFT processor is designed with a memory-based FFT architecture and supports variable lengths from 64 to 4096. Moreover, it is designed with a floating-point operator to prevent the performance degradation of fixed-point operators. FMCW radar signal processing requires windowing operations to increase the target detection rate by reducing clutter side lobes, magnitude calculation operations based on the FFT results to detect the target, and accumulation operations to improve the detection performance of the target. In addition, in some applications such as the measurement of vital signs, the phase of the FFT result has to be calculated. In general, only the FFT is implemented in the hardware, and the other FMCW radar signal processing is performed in the software. The proposed FFT processor implements not only the FFT, but also windowing, accumulation, and magnitude/phase calculations in the hardware. Therefore, compared with a processor implementing only the FFT, the proposed FFT processor uses 1.69 times the hardware resources but achieves an execution time 7.32 times shorter.

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The Ridge Width Dependence of Monolithic Dual-Mode Distributed Feedback Laser for continuous-wave Terahertz Generation

10.1109/islc51662.2021.9615898 ◽

2021 ◽

Author(s):

Te-Hua Liu ◽

Chieh Lo ◽

Chao-Hsin Wu

Keyword(s):

Continuous Wave ◽

Distributed Feedback ◽

Terahertz Generation ◽

Distributed Feedback Laser ◽

Dual Mode ◽

Ridge Width

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Asynchronous electric field visualization using an integrated multichannel electro-optic probe

Scientific Reports ◽

10.1038/s41598-020-73538-7 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Shintaro Hisatake ◽

Junpei Kamada ◽

Yuya Asano ◽

Hirohisa Uchida ◽

Makoto Tojo ◽

...

Keyword(s):

Continuous Wave ◽

Near Field ◽

Horn Antenna ◽

Optimal Placement ◽

Radar Signal ◽

Radiation Patterns ◽

Practical Applications ◽

Fmcw Radar ◽

Realistic Situation ◽

Reference Probe

Abstract The higher the frequency, the more complex the scattering, diffraction, multiple reflection, and interference that occur in practical applications such as radar-installed vehicles and transmitter-installed mobile modules, etc. Near-field measurement in “real situations” is important for not only investigating the origin of unpredictable field distortions but also maximizing the system performance by optimal placement of antennas, modules, etc. Here, as an alternative to the previous vector-network-analyzer-based measurement, we propose a new asynchronous approach that visualizes the amplitude and phase distributions of electric near-fields three-dimensionally without placing a reference probe at a fixed point or plugging a cable to the RF source to be measured. We demonstrate the visualization of a frequency-modulated continuous wave (FMCW) signal (24 GHz ± 40 MHz, modulation cycle: 2.5 ms), and show that the measured radiation patterns of a standard horn antenna agree well with the simulation results. We also demonstrate a proof-of-concept experiment that imitates a realistic situation of a bumper installed vehicle to show how the bumper alters the radiation patterns of the FMCW radar signal. The technique is based on photonics and enables measuring in the microwave to millimeter-wave range.

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Neural Networks Application for Processing of the Data from the FMICW Radars

Symmetry ◽

10.3390/sym11101308 ◽

2019 ◽

Vol 11 (10) ◽

pp. 1308 ◽

Cited By ~ 1

Author(s):

Lubos Rejfek ◽

Tan N. Nguyen ◽

Pavel Chmelar ◽

Ladislav Beran ◽

Phuong T. Tran

Keyword(s):

Neural Network ◽

Neural Networks ◽

Signal Processing ◽

Continuous Wave ◽

Doppler Radar ◽

Radar Signal ◽

Radar Signal Processing ◽

Target Area ◽

The Neural Network ◽

Machine Learning Applications

In this paper the results of the Neural Networks and machine learning applications for radar signal processing are presented. The radar output from the primary radar signal processing is represented as a 2D image composed from echoes of the targets and noise background. The Frequency Modulated Interrupted Continuous Wave (FMICW) radar PCDR35 (Portable Cloud Doppler Radar at the frequency 35.4 GHz) was used. Presently, the processing is realized via a National Instruments industrial computer. The neural network of the proposed system is using four or five (optional for the user) signal processing steps. These steps are 2D spectrum filtration, thresholding, unification of the target, target area transforming to the rectangular shape (optional step), and target board line detection. The proposed neural network was tested with sets of four cases (100 tests for every case). This neural network provides image processing of the 2D spectrum. The results obtained from this new system are much better than the results of our previous algorithm.

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