scholarly journals IDENTIFIKASI GRAVITY WAVES MENGGUNAKAN HIGH PASS FILTER WATER VAPOR BAND SATELIT HIMAWARI DAN DATA MODEL NUMERIK

2020 ◽  
Vol 21 (1) ◽  
pp. 37-41
Author(s):  
I Kadek Nova Arta Kusuma ◽  
Firman Setiabudi ◽  
Eka Fibriantika ◽  
Yunus Subagyo Swarinoto
Keyword(s):  
Water Vapor ◽  
Gravity Wave ◽  
Gravity Waves ◽  
Data Model ◽  
Vertical Wind Shear ◽  
Pass Filter ◽  
High Pass Filter ◽  
Air Turbulence ◽  
Filter Water ◽  
High Pass

Di Indonesia, pemanfaatan citra satelit dan model numerik menjadi acuan utama dalam kegiatan operasional cuaca penerbangan. Fenomena cuaca penerbangan yang masih sulit dideteksi adalah clear air turbulence (CAT). Salah satu penyebab terjadinya CAT adalah adanya gravity wave yang terbentuk di atmosfer. Pada paper ini akan ditunjukkan studi kasus fenomena gravity wave yang diidentifikasi menggunakan metode high pass filter pada water vapor band satelit Himawari dan dianalisis menggunakan model ECMWF 0.125 degree. Dari hasil penelitian diperoleh bahwa metode high pass filter dapat membantu mengenali fenomena gravity wave menjadi lebih mudah dalam bentuk paralel strips.  Pada studi kasus ini, gravity wave terbentuk karena selisih angin yang besar pada lapisan 200 mb dan 250 mb sehingga membentuk vertical wind shear dan cloud billows yang terdeteksi pada Water Vapor Band dan memiliki pola tegak lurus terhadap angin.

Observations of Gravity Waves with High-Pass Filtering in the New Generation of Geostationary Imagers and Their Relation to Aircraft Turbulence

2018 ◽  
Vol 33 (1) ◽  
pp. 139-144 ◽  
Author(s):  
Anthony Wimmers ◽  
Sarah Griffin ◽  
Jordan Gerth ◽  
Scott Bachmeier ◽  
Scott Lindstrom
Keyword(s):  
Water Vapor ◽  
Gravity Waves ◽  
Wave Activity ◽  
Background Flow ◽  
Pass Filter ◽  
Upper Troposphere ◽  
Vapor Channel ◽  
Pass Through ◽  
New Generation ◽  
High Pass

Abstract This paper introduces a method of image filtering for viewing gravity waves in satellite imagery, which is particularly timely to the advent of the next-generation Advanced Himawari Imager (AHI) and the Advanced Baseline Imager (ABI). Applying a “high pass” filter to the upper-troposphere water vapor channel reveals sub-Kelvin-degree variations in brightness temperature that depict an abundance of gravity wave activity at the AHI/ABI sensitivity. Three examples demonstrate that this high-pass product can be exploited in a forecasting setting to identify possible varieties of turbulence-prone gravity waves that either 1) move roughly orthogonally to the apparent background flow or 2) produce interference as separate wave packets pass through the same location.

A V-Band Two Pole High-Pass Filter for Frequency Quadrupler Design

2016 ◽  
Vol 6 (1) ◽  
pp. 56
Author(s):  
Maryam Abata ◽  
Mahmoud Mehdi ◽  
Said Mazer ◽  
Moulhime El Bekkali ◽  
Catherine Algani
Keyword(s):  
Pass Filter ◽  
High Pass Filter ◽  
V Band ◽  
High Pass

A New Stripline High Pass Filter Layout

2000 ◽  
Vol 14 (3) ◽  
pp. 423-439 ◽  
Author(s):  
F. Bilotti ◽  
L. Vegni ◽  
A. Toscano
Keyword(s):  
Pass Filter ◽  
High Pass Filter ◽  
High Pass

Ripple FPN reduced algorithm based on temporal high-pass filter and hardware implementation

2016 ◽  
Author(s):  
Yiyang Li ◽  
Shuo Li ◽  
Zhipeng Zhang ◽  
Weiqi Jin ◽  
Lei Wu ◽  
...  
Keyword(s):  
Hardware Implementation ◽  
Pass Filter ◽  
High Pass Filter ◽  
High Pass

scholarly journals A Compact High-Pass Filter Using Hybrid Microstrip/Nonuniform CPW with Dual-Mode Resonant Response

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Hui Chen ◽  
Di Jiang ◽  
Ke-Song Chen ◽  
Hong-Fei Zhao
Keyword(s):  
Printed Circuit Board ◽  
Coplanar Waveguide ◽  
Cutoff Frequency ◽  
Circuit Board ◽  
Dual Mode ◽  
Pass Filter ◽  
High Pass Filter ◽  
Mode Characteristic ◽  
High Pass ◽  
Good Agreement

A novel and miniature high-pass filter (HPF) based on a hybrid-coupled microstrip/nonuniform coplanar waveguide (CPW) resonator is proposed in this article, in which the designed CPW has exhibited a wideband dual-mode characteristic within the desired high-pass frequency range. The implemented filter consists of the top microstrip coupled patches and the bottom modified nonuniformly short-circuited CPW resonator. Simulated results from the electromagnetic (EM) analysis software and measured results from a vector network analyzer (VNA) show a good agreement. A designed and fabricated prototype filter having a 3 dB cutoff frequency (fc) of 5.78 GHz has shown an ultrawide high-pass behavior, which exhibits the highest passband frequency exceeding 4.0fcunder the minimum insertion loss (IL) 0.75 dB. The printed circuit board (PCB) area of the filter is approximately0.062λg×0.093λg, whereλgis the guided wavelength atfc.

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