搜索结果: 1-15 共查到“光学工程 estimation.”相关记录23条 . 查询时间(0.088 秒)
ON THE ESTIMATION OF POLARIMETRIC PARAMETERS FOR OIL SLICK FEATURE DETECTION FROM HYBRID POL AND DERIVED PSEUDO QUAD POL SAR DATA
SAR RISAT-1 CTLR pseudo-quad pol correlation coefficient sigma naught
2019/2/28
Oil spills in oceans have a significant long term effect on the marine ecosystem and are of prime concern for maritime economy. In order to locate and estimate the oil spread area and for quantitative...
on-orbit modulation transfer function estimation for bilsat imagers
Modeling Resolution Optical Sensors Small satellites Cal/Val
2015/9/1
BiLSAT, launched to its sun-synchronous orbit on 27.09.2003, is a 129 Kg small satellite carrying a panchromatic ca...
Channel Estimation Using Superimposed Training for Coherent Optical OFDM Systems
Channel Estimation Superimposed Training Optical OFDM Systems
2016/12/2
We demonstrate by simulation that the superimposed training based channel estimation scheme can achieve similar performance as compared with conventional schemes, without any loss in bandwidth. An ite...
VOXEL-BASED ESTIMATION OF PLANT AREA DENSITY FROM AIRBORNE LASER SCANNER DATA
Canopy structure Three-dimensional (3-D) Flight line Lidar Plant area index Crown volume
2014/6/5
Three-dimensional distribution of plant area density (PAD) was retrieved using airborne laser scanning (ALS) data. The calculation of PAD requires the number of laser-pulses intercepted by plant mater...
Accurate Distance Estimation for VANET Using Nanointegrated Devices
Vehicular Ad-Hoc Networks Positioning Systems Wireless Networks Nanotechnology devices CNT Sensors
2013/1/30
Vehicular Ad-Hoc Networks (VANET) is a research venue that promises for many useful applications. Most of these applications require a precise real-time positioning system for each vehicle. However, p...
Low-Complexity Two-Stage Carrier Phase Estimation for 16-QAM Systems using QPSK Partitioning and Maximum Likelihood Detection
Low-Complexity Two-Stage Carrier Phase Estimation 16-QAM Systems QPSK Partitioning Maximum Likelihood Detection
2015/5/20
A feedforward carrier phase estimation algorithm using a modified QPSK partition approach followed by maximum-likelihood (ML) detection is proposed. Results demonstrate complexity reduction by more th...
Precise,Robust and Least Complexity CD estimation
Precise Robust Least Complexity CD estimation
2015/5/15
We demonstrate robust and precise frequency domain chromatic dispersion estimation based on offline data and simulations. The blind, least complexity algorithm allows fast acquisition suitable for dig...
Study on the Performance of Decision-Aided Maximum Likelihood Phase Estimation with a Forgetting Factor
Forgetting Factor Decision-Aided Maximum Likelihood Phase
2015/5/15
A structure of non-adaptive decision-aided maximum likelihood is demonstrated by introducing a forgetting factor via both analysis and experiments, which achieves the same performance as the adaptive ...
Optimization of Carrier Phase Estimation for 112 Gbit/s PM-QPSK Systems
Gbit/s PM-QPSK System Optimization Carrier Phase
2015/5/15
For 112 Gbit/s PM-QPSK systems, the residual phase noise auto-correlation function with a lag of N can serve as a suitable monitor signal for optimizing the averaging in carrier phase estimation algor...
Novel Ultra Wide-Range Frequency Offset Estimation for Digital Coherent Optical Receiver
Optical communications Coherent communication Phase modulation
2015/6/10
We propose and experimentally demonstrate a novel, dual-stage frequency offset estimator and achieve the widest range of ±0.5 times the system symbol rate for the first time in a 42.8-Gbit/s coherent ...
Frequency Resolved Angle and Time Difference of Arrival Estimation With Spatial Spectral Holography
Fourier optics signal processing Analog optical signal processing Holography Optical storage materials
2015/6/10
Correlative power spectrum and spectral phase mapping via readout of a fiber interferometer with spatial-spectral materials is analyzed and demonstrated to enable precise frequency resolved time delay...
Routing and Wavelength Assignment for Transparent Optical Networks With QoT Estimation Inaccuracies
Networks assignment routing algorithms Optical communications
2015/6/5
We show how inaccuracies of Quality of Transmission (QoT) estimations, caused by imperfect models and lack of monitors in transparent optical networks, can be mitigated using a novel routing and wavel...
Experimental Demonstration of Decision-Aided Maximum Likelihood Phase Estimation in 8-Channel 42.8-Gbit/s DWDM Coherent PolMux-QPSK System
Optical communications Coherent communication Phase modulation
2015/6/5
We experimentally demonstrate a novel decision-aided maximum likelihood phase estimation in an 8-Channel 42.8-Gbit/s DWDM coherent PolMux QPSK system. The results show that our proposed algorithm can ...
Frequency Domain Chromatic Dispersion Estimation
Coherent communications Fiber optics communications
2015/6/4
The low complexity, robust, and precise algorithm solely employs a simplified auto-correlation function of the signal spectrum for blind chromatic dispersion estimation to adapt fre-quency domain comp...
Digital Phase Estimation Method based on Karhunen-Loève series expansion for Coherent Phase Diversity Detection
Optical communications Coherent communications Homodyning
2015/6/4
A novel phase estimation method for coherent systems is presented and demonstrated.It outperforms 5.5 times the phase noise and spectral width tolerance respect to the other methods.