Raqrs06 Borel Talk 8 15 06 White
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The document describes the ARTEMISS algorithm for retrieving surface temperature and emissivity from hyperspectral thermal infrared data. It discusses using in-scene atmospheric compensation to estimate transmission and path radiance from the data. It then uses these estimates along with lookup tables and spectral smoothness constraints to retrieve temperature and emissivity. Sensitivity studies show the algorithm works well except when there are issues like spectral miscalibration. A spectral smile and shift retrieval technique is also presented to characterize sensor calibration issues.
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![Error Analysis for a Temperature and Emissivity Retrieval Algorithm for Hyperspectral Imaging Data Christoph Borel, PhD [email_address] , http://cborel.net ARTEMISS The 2nd I nternat i onal Sympos i um on Recent Advances i n Quant i tat i ve Remote Sens i ng: RAQRS ' II](https://image.slidesharecdn.com/raqrs06boreltalk8-15-06white-090923190208-phpapp02/85/Raqrs06-Borel-Talk-8-15-06-White-1-320.jpg)
![Content ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ARTEMISS A utomatic R etrieval of T emperature and EMI ssivity using S pectral S moothness ( ARTEMISS )](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Ill-posedness formulation of the emission source localization in the radio- d...
Ill-posedness formulation of the emission source localization in the radio- d...Ahmed Ammar Rebai PhD
To contact the authors : tarek.salhi@gmail.com and ahmed.rebai2@gmail.com
In the field of radio detection in astroparticle physics, many studies have shown the strong dependence of the solution of the radio-transient sources localization problem (the radio-shower time of arrival on antennas) such solutions are purely numerical artifacts. Based on a detailed analysis of some already published results of radio-detection experiments like : CODALEMA 3 in France, AERA in Argentina and TREND in China, we demonstrate the ill-posed character of this problem in the sens of Hadamard. Two approaches have been used as the existence of solutions degeneration and the bad conditioning of the mathematical formulation problem. A comparison between experimental results and simulations have been made, to highlight the mathematical studies. Many properties of the non-linear least square function are discussed such as the configuration of the set of solutions and the bias.
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An absorption profile centred at 78 megahertz in the sky-averaged spectrum
1. Scientists detected a flattened absorption profile in the sky-averaged radio spectrum centered at 78 megahertz using the EDGES instrument.
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Ocheltree & Frizzell (1989) Sound Field for Rectangular Sources
This document presents a method for calculating the sound field produced by a rectangular continuous wave acoustic source surrounded by a rigid plane baffle. The method involves dividing the radiating surface into rectangular elements and summing the pressure contributions from each element using approximations valid in the far field. Sound field calculations are shown for square sources ranging in size from 0.5 to 100 wavelengths on a side. The results are compared to published sound fields for similarly sized circular sources, showing similarities in beam width and locations of on-axis minima but a more uniform transverse pressure distribution for square sources in the near field. The effects of attenuation on the sound field of a square source are also examined.
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AIAA-2005-3021-331
This document discusses investigating duct propagation and far field radiation of fan noise sources with acoustic wall treatment. It presents two codes - the Eversman radiation code and a modified version that includes compressibility effects. The modified code is used to study modal reflection and scattering inside the inlet and exit ducts due to wall treatment. Validation of the codes is performed by comparing predictions to experimental data for hard wall and treated configurations. Parameters like inlet lip thickness that affect far field directivity patterns are also investigated.
Modeling Beam forming in Circular Antenna Array with Directional Emitters
ABSTRACT: The article discusses the functioning of the radio direction-finding and beamforming methods in the system of circular antenna arrays formed from the designed radiators, directional factor which is not equal to 1. Evaluation of forming of spatial pattern of cylindrical antenna array using phased method is fulfilled. DolphChebyshev window is used to reduce the side lobe level.
389418
The document describes the design and testing of a circular microstrip patch array antenna for C-band altimeter systems. It discusses using an array of four circular microstrip elements with equal size and spacing to achieve a gain of 12 dB. The antenna was simulated using HFSS and Microwave Office software. Comparison of simulated and measured results showed good agreement, achieving the design goals.
Four-Element Triangular Wideband Dielectric Resonator Antenna excited by a Co...
Abstract-This paper numerically examines an array of four dielectric resonant antenna of equilateral triangle
shape. The Structure provides wideband low profile monopole-like antenna. As much as 30.90 % matching
bandwidth (S11<-10 dB) with monopole-like radiation pattern over the entire band has been achieved with 6.357
dBi peak gain. The geometry is a four equilateral triangular dielectric volume over a ground plane, and is
centrally excited by a coaxial probe to provide a broadside radiation pattern. An approximate expression is
used to compute the resonance frequency. Results are simulated using CST (Computer Simulation Technology)
Microwave Studio Suite 10.
Keywords-Dielectric resonator (DR), triangular dielectric resonator antenna (TDRA), S11 (S-Parameter),
perfect conductor (PEC), Impedance Bandwidth (IBW).
Some possible interpretations from data of the CODALEMA experiment
The purpose of the CODALEMA experiment, installed at the Nan\c{c}ay Radio Observatory (France), is to study the radio-detection of ultra-high energy cosmic rays in the energy range of 10^{16}-10^{18} eV. Distributed over an area of 0.25 km^2, the original device uses in coincidence an array of particle detectors and an array of short antennas, with a centralized acquisition. A new analysis of the observable in energy for radio is presented from this system, taking into account the geomagnetic effect. Since 2011, a new array of radio-detectors, consisting of 60 stand-alone and self-triggered stations, is being deployed over an area of 1.5 km^2 around the initial configuration. This new development leads to specific constraints to be discussed in term of recognition of cosmic rays and in term of analysis of wave-front.
Line Spectra (Rydberg’s Constant)
The document describes an experiment to measure Rydberg's constant using the emission spectrum of hydrogen. Electrons in hydrogen atoms absorb energy and transition to higher energy levels. When they drop down, they emit photons of specific wavelengths according to Planck's law. By measuring the wavelengths of photons emitted during transitions from higher to lower energy levels in the Balmer series, Rydberg's constant can be calculated and verified. Measurements of hydrogen's spectral lines will be used to calculate Rydberg's constant and compare to the accepted value.
Performance of cognitive radio networks with maximal ratio combining over cor...
Performance of cognitive radio networks with maximal ratio combining over cor...Polytechnique Montreal
This document analyzes the performance of cognitive radio networks using maximal ratio combining over correlated Rayleigh fading channels. It presents a simple analytical method to derive closed-form expressions for the probabilities of detection and false alarm. The key findings are:
1) The detection probability is a monotonically increasing function of the number of antennas, as more antennas provides more diversity gain.
2) Antenna correlation degrades the sensing performance compared to independent antennas. Higher correlation results in lower detection probability.
3) Complementary receiver operating characteristic curves illustrate that both higher signal-to-noise ratio and lower antenna correlation improve detection performance by increasing the detection probability and decreasing the probability of miss at a given false alarm probability.Art%3 a10.1155%2fs1110865704401036
This document presents a novel algebraic method called multidimensional rank reduction estimator (MD RARE) for simultaneously estimating parameters of a parametric MIMO channel model from channel sounder measurements. The MD RARE algorithm estimates propagation delay, direction of arrival, and other parameters sequentially by exploiting the Vandermonde structure of the data model. This reduces dimensionality and complexity compared to existing methods. The performance of MD RARE is illustrated using simulated and measured data from a vector channel sounder.
Determination of Milky Way Rotation Curve Through Observation of Redshift of ...
Determination of Milky Way Rotation Curve Through Observation of Redshift of ...Daniel Bulhosa Solórzano
This experiment used a radio telescope to measure the rotation curve of the Milky Way galaxy by observing the redshift of hydrogen radiation at 1420.40 MHz. Measurements were taken at galactic longitudes from 5 to 90 degrees. The results showed reasonable agreement with published values for radii greater than 3 kpc. However, considering the mass contained within 8.33 kpc as suggested by the rotation curve reveals a discrepancy, with more mass implied than can be accounted for by observed matter, suggesting the presence of unseen "dark matter".Similar to Raqrs06 Borel Talk 8 15 06 White (20)
Ill-posedness formulation of the emission source localization in the radio- d...
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Numerical studies of the radiation patterns of resistively loaded dipoles
Numerical studies of the radiation patterns of resistively loaded dipoles
An absorption profile centred at 78 megahertz in the sky-averaged spectrum
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Ocheltree & Frizzell (1989) Sound Field for Rectangular Sources
Ocheltree & Frizzell (1989) Sound Field for Rectangular Sources
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Four-Element Triangular Wideband Dielectric Resonator Antenna excited by a Co...
Four-Element Triangular Wideband Dielectric Resonator Antenna excited by a Co...
Some possible interpretations from data of the CODALEMA experiment
Some possible interpretations from data of the CODALEMA experiment
Performance of cognitive radio networks with maximal ratio combining over cor...
Performance of cognitive radio networks with maximal ratio combining over cor...
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- 1. Error Analysis for a Temperature and Emissivity Retrieval Algorithm for Hyperspectral Imaging Data Christoph Borel, PhD [email_address] , http://cborel.net ARTEMISS The 2nd I nternat i onal Sympos i um on Recent Advances i n Quant i tat i ve Remote Sens i ng: RAQRS ' II
- 3. Measured radiance in the thermal infrared L down L ground L path T ground , ε Problem: What is the emissivity and temperature?
- 5. In-scene atmospheric correction (ISAC) Radiance a blackbody would have at λ : B(λ,T B ) Measured radiance: L m (λ) Intercept ~ L p (λ) Graybody pixels ( ε <1) Blackbody pixels ( ε =1) Slope ~ ((λ) Measured radiance: Scatterplot determines transmission and path radiance: T B (i,j)=B -1 (λ 0 ,Lm(λ 0 ,i,j))/ε0
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- 9. Surface emissivity spectra From: Johns Hopkins spectral library
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- 14. Summary of useful error terms
- 16. A utomatic R etrieval of T emperature and EMI ssivity using S pectral S moothness ( ARTEMISS ) algorithm Minimize:
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- 21. Effect of spectral shifts on T and ε The RMSE and mean temperature retrieval error(left) and the RMSE and mean emissivity retrieval error as a function of spectral shift. The mean temperature error increases to over 1 º K for spectral shifts as small as 1/20th of a channel spacing. Wrong atmosphere causes temperature offset
- 22. Effect of Noise on Temperature T and Emissivity ε Example of the growth of the RMS temperature and emissivity error as a function of sensor noise.