Tübitak SAGE ASELSAN ROKETSAN article's archive

[Bogeyman]

I will share the archive in bulk. The article titles are as follows

Kinematic analysis of imaging seekers with roll-over-nod gimbal and a folded electro-optical layout (Erratum)
Kutlu D. Kandemir,1 Yigit Yazicioglu,2 Bulent Ozkan3
1ASELSAN A.S. (Turkey), 2Middle East Technical Univ. (Turkey), 3TÜBITAK SAGE (Turkey)

Optical flow assisted IRCCM algorithm for sea skimming anti-ship missile systems
Kemal Arda Özertem
Dept. of Guidance Design, Roketsan

Low dark current diffusion limited planar type InGaAs photodetectors
M. Halit Dolas*a, b, Okan Atesala, M. Deniz Caliskana, Alpan Bekb, Ekmel Ozbaya
a Nanotechnology Research Center (NANOTAM)
Bilkent University, Ankara, Turkey
b Micro and Nanotechnology Department
Middle East Technical University, Ankara, Turkey

Design of dual mode seeker for millimeter wave and four quadrant detectors in missile application
Doğan Uğur SAKARYA
Prof. Dr. Hüseyin SARI
Tactical Missile Systems Group, Roketsan,

Lock-on range estimation in an air-to-air engagement situation
Birkan Cetin, Kutlu D. Kandemira
TÜBİTAK SAGE

Normally-off p-GaN gate InAlN/GaN HEMTs grown on silicon substrates
Melisa Ekin Gulseren1,2, Berkay Bozok1,2, Gokhan Kurt2, Omer Ahmet Kayal2, Mustafa Ozturk2, Sertac Ural2, Bayram
Butun2, Ekmel Ozbay1,2,3,4
1 Department of Electrical and Electronics Engineering, Bilkent University,
2 Nanotechnology Research Center, Bilkent University,
3 UNAM-Institute of Materials Science and Nanotechnology, Bilkent University,
4 Department of Physics, Bilkent University

Field Test and Fading Measurement of a Distributed Acoustic Sensor System over a 50 km-long Fiber
Faruk Uyara,b, Tolga Kartaloglub, Ibrahim Ozdurb,c and Ekmel Ozbaya,b,d
aDepartment of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey
bNanotechnology Research Center, Bilkent University, Ankara, Turkey
cDepartment of Electrical and Electronics Engineering, Abdullah Gul University, Kayseri, Turkey
dDepartment of Physics, Bilkent University

Disordered and Densely Packed ITO Nanorods as an Excellent Lithography-Free Optical Solar Reflector Metasurface for the Radiative Cooling of Spacecraft
Deniz Umut YILDIRIMa,b,c, Amir Ghobadia,b,c, Mahmut Can Soydana,b,c, Okan Atesala,
Ahmet Topraka, Mehmet Deniz Caliskana, Ekmel Ozbaya,b,c,d
a NANOTAM-Nanotechnology Research Center, Bilkent University
b Department of Electrical and Electronics Engineering, Bilkent University
c UNAM-Institute of Materials Science and Nanotechnology, Bilkent University
d Department of Physics, Bilkent University

Optical designs for MWIR and four quadrant detectors by using beam steering methods in missile applications
Doğan Uğur SAKARYA
Tactical Missile Systems Group

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A Comparison of MWIR and LWIR Imaging Systems with regard to Range Performance
Berk Berkan TURGUT*a,d, Göktuğ Gencehan ARTANa, Alpan BEKb,c,d
a Optical Design Division, TUBITAK SAGE; bThe Center for Solar Energy
Research and Applications (GUNAM), Department of Physics, Middle East Technical University (METU); dMicro and Nanotechnology Program of Graduate School of Natural and Applied Sciences, Middle East Technical University (METU)

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With love to our TAI engineer friend who downloaded the archive from the site and shared it with us ...

 

[Bogeyman]

An arbitrary waveform magnetic nanoparticle relaxometer with an asymmetrical three-section gradiometric receive coil

https://journals.tubitak.gov.tr/elektrik/issues/elk-20-28-3/elk-28-3-11-1907-201.pdf

A fabrication-oriented remeshing method for auxetic pattern extraction

https://journals.tubitak.gov.tr/elektrik/issues/elk-20-28-3/elk-28-3-23-1908-51.pdf

ASELSAN-METU 3D printer collaboration

Radar applications and microelectronic technology in Turkey

View attachment 7354

Working for Gallium Nitride Transistor technologies at Istanbul Technical University, Prof. İsmail Serdar Özoğuz ranked 792th among 87611 academics in the world.

İTÜ Prof.Dr. İsmail Serdar Özoğuz academic profile and some projects in the past

Prof.Dr. İsmail Serdar Özoğuz | AVESİS

avesis.itu.edu.tr

Lida Kouhalvandi

Associate Professor & SMIEEE of Electronics and Communication Eng., Dogus University - 321 tarafından alıntılandı - Optimization algorithms - Power amplifier - Antenna - Implantable medical devices - Analog design

scholar.google.com.tr

Design and Implementation of a High Power GaN Amplifier with Nonlinear Optimization Techniques
Start Date: February 2019
Continues

Design and Implementation of a High Power GaN Amplifier with Nonlinear Optimization Techniques (Doğrusallaştırılmış Yüksek Güçlü GaN Kuvvetlendiricilerin Tasarımı ve Gerçeklemesi) | AVESİS

avesis.itu.edu.tr

Low Noise Amplifier Design for 5G Communication Systems
Start Date: March 2016
Continues

Kablosuz haberleşme, hafıza, ve analog uygulamalar için spintronik aygıtlar | AVESİS

avesis.itu.edu.tr

Design of a spurious-free RF frequency synthesizer for fast-settling receivers

https://journals.tubitak.gov.tr/elektrik/issues/elk-20-28-3/elk-28-3-5-1907-105.pdf

Roketsan's study to differentiate false targets in L band wavelength. It is likely to be developed for guidance systems.

Multiplicative-additive despeckling in SAR images

https://journals.tubitak.gov.tr/elektrik/issues/elk-20-28-4/elk-28-4-5-1908-163.pdf

Computer Engineering students of Konya Food and Agriculture University studied image optomization on synthetic aperture radars.

Maritime automatic target recognition for ground based scanning radars by using 2 sequential range profiles

https://t.co/UAH5Agj4tc?amp=1

In an article from Tübitak Bilgem, a ship profile was studied on land-based marine surveillance radars.
It is very likely that the work is for Serhat Coastal Surveillance Radars.

A KU-BAND PHEMT MMIC HIGH POWER AMPLIFIER DESIGN

http://repository.bilkent.edu.tr/bitstream/handle/11693/18318/10046000.pdf?sequence=1&isAllowed=y

X-BAND HIGH POWER GaN POWER AMPLIFIER DESIGN AND IMPLEMENTATION

http://etd.lib.metu.edu.tr/upload/12619650/index.pdf

Two novel radar detectors for spiky sea clutter with the presence of thermal noise and interfering targets

https://journals.tubitak.gov.tr/elektrik/issues/elk-20-28-3/elk-28-3-27-1909-20.pdf

This is from Algeria.

 

[Bogeyman]

Catalytic hydrolysis of hydrazine borane for chemical hydrogen storage: Highly efficient and fast hydrogen generation system at room temperature - An article from METU explains the storage of Hydrogen as a solid at room temperature.

Catalytic hydrolysis of hydrazine borane for chemical hydrogen storage: Highly efficient and fast hydrogen generation system at room temperature | 10.1016/j.ijhydene.2010.12.129_Sci-hub

scihub.wikicn.top

 

[Bogeyman]

A 1280×1024-15µm CTIA ROIC for SWIR FPAs

SPIE Proceedings [SPIE SPIE Defense + Security - Baltimore, Maryland, United States (Monday 20 April 2015)] Infrared Technology and Applications XLI - A 1280×1024-15μm CTIA ROIC for SWIR FPAs | 10.1117/12.2179537_Sci-hub

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One of the first publications published in ASELSAN's CATS FLIR projects. Year 2015

Note: Hold on, folks, the bombardment has just begun!

 

[Bogeyman]

Enabling Cognition on Electronic CounterMeasure Systems against Next-Generation Radars

(PDF) Enabling Cognition on Electronic CounterMeasure Systems against Next-Generation Radars

PDF | Current Electronic CounterMeasure (ECM) systems process preprogrammed jamming techniques against radar threats that are captured and identified by... | Find, read and cite all the research you need on ResearchGate

www.researchgate.net

Realizing joint radar-communications in coherent MIMO radars - ASELSAN

Realizing joint radar-communications in coherent MIMO radars | 10.1016/j.phycom.2018.11.011_Sci-hub

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Capacity analysis for joint radar-communication capable coherent MIMO radars - ASELSAN

Capacity analysis for joint radar-communication capable coherent MIMO radars | 10.1016/j.phycom.2020.101062_Sci-hub

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Internet of Radars (IoR): Internet of RAdio Detectors And Rangers

(PDF) Internet of Radars (IoR): Internet of RAdio Detectors And Rangers

PDF | The Internet of Things (IoT) are interconnected devices for exchanging information through sensors and actuators. One of the main physical sensors... | Find, read and cite all the research you need on ResearchGate

www.researchgate.net

Internet of Radars: Sensing versus Sending with Joint Radar-Communications - ASELSAN

Internet of Radars: Sensing versus Sending with Joint Radar-Communications | 10.1109/MCOM.001.1900550_Sci-hub

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Dedicated engineering test equipment design for multi-function radar hybrid T/R modules

Sci-Hub | [IEEE 2016 IEEE AUTOTESTCON - Anaheim, CA, USA (2016.9.12-2016.9.15)] 2016 IEEE AUTOTESTCON - Dedicated engineering test equipment design for multi-function radar hybrid T/R modules | 10.1109/AUTEST.2016.7589637

 

[Cabatli_TR]

Great! Attention to resolution Aselsan is working on. We are going to see 1280x1024 resolution SWIR and MWIR detectors soon.

 

[Bogeyman]

Deep learning in electronic warfare systems: Automatic intra-pulse modulation recognition - ASELSAN - Mayıs 2018

[IEEE 2018 26th Signal Processing and Communications Applications Conference (SIU) - Izmir, Turkey (2018.5.2-2018.5.5)] 2018 26th Signal Processing and Communications Applications Conference (SIU) - Deep learning in electronic warfare systems: Automa

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[Bogeyman]

PERFORMANCE ANALYSIS OF CODED WAVEFORM SONAR
Performance analysis for coded waveform sonars that are resistant to acoustic countermeasure traps and jammers and can turn into a sonar sensor network with the infrastructure it provides - Meteksan

Scenarios submarine detection from submarine - submarine detection from torpedo - surface ship detection from submarine

https://www.meteksan.com/files/makaleler/performance_analysis.pdf

 

[Bogeyman]

Meteksan developed an amplifier operating at 1.9 - 2.1 GHz wavelength with 25 W output power with GaN HEMT microelectronic technology

https://www.meteksan.com/files/makale_yeni/deser_awr.pdf

 

[adenl]

A 1280×1024-15µm CTIA ROIC for SWIR FPAs

SPIE Proceedings [SPIE SPIE Defense + Security - Baltimore, Maryland, United States (Monday 20 April 2015)] Infrared Technology and Applications XLI - A 1280×1024-15μm CTIA ROIC for SWIR FPAs | 10.1117/12.2179537_Sci-hub

scihub.wikicn.top

One of the first publications published in ASELSAN's CATS FLIR projects. Year 2015

Note: Hold on, folks, the bombardment has just begun!

This development if completed, propels Aselsan into the top of the world. Next step is full HD thermal resolution in these light-weight turrets!

 

[Bogeyman]

https://twitter.com/i/web/status/1350568779634323456

I shared all the processes and technologies used by TÜBİTAK BİLGEM UEKAE Semiconductor Technologies Research Laboratory (YİTAL) related to microelectronics in a single series. Those concerned can translate from Turkish to English.

 

[Bogeyman]

NAVIGATION AND CONTROL STUDIES ON CRUISE MISSILES

A THESIS SUBMITTED TO THE GRADUATE SCHOOL OF NATURAL AND APPLIED SCIENCES OF MIDDLE EAST TECHNICAL UNIVERSITY

https://etd.lib.metu.edu.tr/upload/12608142/index.pdf

Navigation technology of the SOM cruise missile

 

[Bogeyman]

Wafer-Level Low-Temperature Solid-Liquid Inter-Diffusion Bonding With Thin Au-Sn Layers for MEMS Encapsulation

Wafer-Level Low-Temperature Solid-Liquid Inter-Diffusion Bonding With Thin Au-Sn Layers for MEMS Encapsulation

A novel solid-liquid inter-diffusion (SLID) bonding process is developed allowing to use thin layers of the Au-Sn material in wafer-level microelectromechanical systems (MEMS) packaging while providing a good bonding strength. The bond material layers are designed to have a robust bond material...

ieeexplore.ieee.org

Metu MEMS production technology

 

[Bogeyman]

Wafer-Level Low-Temperature Solid-Liquid Inter-Diffusion Bonding With Thin Au-Sn Layers for MEMS Encapsulation

Wafer-Level Low-Temperature Solid-Liquid Inter-Diffusion Bonding With Thin Au-Sn Layers for MEMS Encapsulation

A novel solid-liquid inter-diffusion (SLID) bonding process is developed allowing to use thin layers of the Au-Sn material in wafer-level microelectromechanical systems (MEMS) packaging while providing a good bonding strength. The bond material layers are designed to have a robust bond material...

ieeexplore.ieee.org

Metu MEMS production technology

@Cabatli_53 @Test7 @Combat-Master @Kartal1 @anmdt @Saithan
Don't miss it, folks.

 

[Bogeyman]

Interband optical absorption obtained by pseudopotential method for type-II InAs/GaSb SL photodetectors​

https://iopscience.iop.org/article/10.1088/1361-6463/abe3ae/meta

Metu MEMS infrared photodedector technology

 

[Bogeyman]

Role of New Synthesized Diethylenetriamine-Based Protic Ionic Liquids in Organic Semiconductor Devices

https://www.researchgate.net/profile/Selin-Piravadili/publication/347947234_Journal_Pre-proof_Role_of_new_synthesized_diethylenetriamine-based_protic_ionic_liquids_in_organic_semiconductor_devices/links/5fe9a3e6a6fdccdcb80cc9d8/Journal-Pre-proof-Role-of-new-synthesized-diethylenetriamine-based-protic-ionic-liquids-in-organic-semiconductor-devices.pdf

A TUBITAK MAM publication. Obtaining high-performance organic transistors from OLEDs

 

[Bogeyman]

High efficiency nanohole based immersion metalens for light concentration
6 August 2021 ASELSAN

Abstract

Design and performance analysis of a high efficiency, nanohole based, polarization-insensitive, all-dielectric, immersion metalens is presented, which is to be monolithically integrated into a backside illuminated HgCdTe based photodetector with CdZnTe (4%) as the substrate material for MWIR (3-5 μm) applications. Although HgCdTe based IR imaging dominate the high-performance end of the market, enhancing the signal-to-noise ratio (SNR) performance is still one of the challenges. This is typically dealt with either by improving the quantum efficiency (QE) with the employment of AR surfaces and photon trapping schemes or by decreasing the noise level with a reduction in detector volume. Decreasing either the thickness or the area of the detector, which comes with a performance degradation in QE in return, does the volume reduction. Nevertheless, the reduced QE can be recovered through light concentration with the employment of microlenses in the case of reduced area, which is typically realized with curved lenses presenting curve formation and packaging related issues. These issues can be overcome with the utilization of lithography-compatible metalenses carved into the substrate material. Thus, in this study, a nanohole based array of 40×40 is optimized to be monolithically integrated into CdZnTe (4%) substrate with a placement period of 1.0μm, a depth of around 4.9μm in order to construct a metalens structure with a numerical aperture of 0.63, and operation wavelength of 4.0μm. The nanohole width changes within a range of 0.35μm to 0.83μm in order to provide 2π phase coverage. Single layer of SiO2 based antireflective surface is introduced to the design in order to enhance the focusing efficiency, which is determined to be around 91%.

High efficiency nanohole based immersion metalens for light concentration

Design and performance analysis of a high efficiency, nanohole based, polarization-insensitive, all-dielectric, immersion metalens is presented, which is to be monolithically integrated into a backside illuminated HgCdTe based photodetector with CdZnTe (4%) as the substrate material for MWIR...

www.spiedigitallibrary.org

Poster link

SPIE-OP21N-659f6b9d-4565-eb11-814a-005056be4d05

MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.

www.mediafire.com

Main article

117952C

MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.

www.mediafire.com

KEYWORDS

Photodetectors,
Signal to noise ratio,
Absorption,
Microlens,
Mid-IR,
Quantum efficiency,
Refractive index

 

[Bogeyman]

Optical design of triple-mode seeker (Interpretation of the OMTAS anti-tank project with imported detectors. There is no information on national detector work.)

In missile applications, new counter measure methods are getting more complex. To discriminate and detect
counter measure and to understand target signature from scene is getting harder. Because of all that concerns,
using triple-mode seeker for a system solution is a good solution for system total performance. By this way, tridifferent wavelength could be used for same system and same scene. In this study, triple mode system’s optical
designs have been made for mid-wave infra-red imaging, long-wave infra-red imaging and short-wave infrared
imaging. Optical designs performances have been illustrated in simulation results. Finally, conceptual design of
triple mode seeker will be summarized.

The effects of M2 factor on steel

This paper presents the effects of M2 (M square) factor of the laser source on steel materials in terms of spot size, duration of exposure and power density. Generally, laser sources are modelled as a Gaussian beam. M2 factor is known as the beam quality factor and it represents the degree of variation of a laser beam from an ideal Gaussian beam. It determines how well a laser beam will focus or diverge. According to ISO 11146-1, M2 is defined as BPP (Beam Parameter Product) divided by λ/π. It is also related to beam waist and divergence angle. A perfect beam would be a single mode TEM00 laser beam. Single mode fibers have smaller core diameter. It means that it can focus more easily than multi mode fiber laser can. In this study damage effects of CW lasers, which have 1070 nm wavelength, on 1 mm thick steel target plate are examined. Effects of using two different M2 values at different output powers are investigated experimentally and the results are discussed. These results will help compare the theory with experimental results.

Research on the cutting-edge application of high energy laser CUAS technology (This article was not Roketsan's. At the last moment, it's escaped my eye)

In order to further study the application of laser technology in Counter-Unmanned Aerial System (C-UAS), this paper
makes a systematic, analytical, comprehensive and cutting-edge summary of a large number of literatures. On this basis, about 545 C-UAS products from 38 countries of origin and 277 manufacturers around the world are analyzed, with emphasis on products with laser interception capability. In the process of discussion, on the one hand, the development of laser C-UAS systems in different countries and their successful applications in practical tasks are reviewed longitudinally with time as a clue; on the other hand, the data statistics from multiple angles of existing laser C-UAS systems around the world are carried out horizontally. Finally, on the basis of a large number of literature analysis, several main bottlenecks in the future development of HEL systems are extracted, and the future development trend are prospected.

Effects of tilt and decenter on power density in an optomechanics design for high-power laser systems

This paper presents effects of tilt and decenter caused by vibration on spot size and shape. The ideal spot shape for a laser source can be modeled as a Gaussian curve. In high-power laser systems, focusing the laser beam on a target is very crucial to increase the power density. The laser spot size should be small to focus the energy on a small area on the target adequately. Thus, it is necessary that the optomechanical system mustn’t be affected by environmental factors such as temperature, humidity, vibration, etc. In this study, the effect of vibration on optomechanical design is examined. Results of optomechanical design analysis performed by using the finite element method are take into account to get tilt and decenter values as an input. The analysis is based on the MIL-STD-810G standard. As a result of the analysis, tilt and decenter values exposed to optomechanical design are determined and these values were provided as the input to the optical design.



Comparison of passive athermalization results of LWIR optical designs utilizing different infrared optical materials

In this paper, different optical designs, which are composed of different LWIR optical materials, are utilized for passive athermalization and their performance in athermalization are analyzed. The optical designs are carried out by preserving the athermal property as well as keeping the image quality at higher levels within the working temperature between –40 ºC and +60 ºC. Our designs consist of two different infrared optical elements to maintain the focus positions as stable as possible within the working temperature. The passive athermalization process begins with the calculation of athermalization conditions of candidate material properties. By taking into account these conditions, athermal material pairs are chosen. The optical design begins with an optimization process using paraxial optics. In order to reduce aberrations such as coma, astigmatism, spherical and chromatic, aspherical surfaces are utilized during the optimization process. At the end of the design phase, the performance of different configurations of athermal optical material pairs, which are enclosed by aluminum alloy housing material, are presented.

paper

MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.

www.mediafire.com

 

[Bogeyman]

OPTICAL DESIGN OF A DUAL BAND INFRARED SEEKER FOR PRECISION GUIDED SYSTEMS

Infrared guided systems are used to track the target and destroy it, by using the radiation emitted from it. The main components of the guided systems can be listed as follows: a dome, a lens-set (or mirrors) and a detector. In this study, the optical design of a seeker, operating in two bands of infrared (MWIR–LWIR), is performed. Dual-band optics design has been developed by using two softwares: Zemax, OpticStudio. Before the design the seeker-optics is started, the commercially available dual-band IR detectors are searched by comparing the performances of the latest detector technologies. By using the optical parameters of the selected detector, the design of the IR imaging seeker is completed for the operation within the wavelength range of 3 – 10 µm. The temperature dependence of the optical design is also examined by using four different body materials, for the large temperature interval ranging from –40 to +80 °C. The defocusing effect caused by using different materials is fixed by passive-optical-athermalization technique. The design is completed evaluating the cost and availability of the materials used in the design. The field of view of the optical system is found to be 16°. MTF value of each field is higher than 50% when the spatial frequency takes a value of 23 lp/mm. The results are analyzed and discussed in terms of spot-diagram, modulation transfer function (MTF), Seidel diagram and encircled energy distribution.

http://www.openaccess.hacettepe.edu.tr:8080/xmlui/bitstream/handle/11655/9448/10276631.pdf?sequence=1&isAllowed=y

Aslı Doğan is a ROKETSAN engineer

https://www.linkedin.com/in/asl%C4%B1-do%C4%9Fan-7155a984/

Ufuk Efe on LinkedIn: Our paper "DFM: A Performance Baseline for Deep Feature Matching"…

Our paper "DFM: A Performance Baseline for Deep Feature Matching" collabrated with Kutalmış Gökalp İnce, PhD and Professor Dr. A. AYDIN ALATAN has been…

www.linkedin.com

DFM: A Performance Baseline for Deep Feature Matching

https://openaccess.thecvf.com/content/CVPR2021W/IMW/papers/Efe_DFM_A_Performance_Baseline_for_Deep_Feature_Matching_CVPRW_2021_paper.pdf

 

[Bogeyman]

Investigation of the star tracker algorithms and kalman filter integration​

This research outlines the investigation of star tracker algorithms and Kalman Filter implementation of star tracker aided INS. In the first chapter, the usage areas of the star tracker sensor was investigated. The purposes to use this sensor were also included. Furthermore, the sensor architecture and algorithms were examined. In the second chapter, the three main steps of the star tracker algorithms were investigated. First of all, literature survey about centroiding algorithms was done and two of them were examined in detail. Then, the literature about star matching algorithms was searched. Liebe’s triangle method and Astrometry.net’s quad method were investigated in detail. Finally, the research about the attitude determination algorithms was made. The studies made about three of them which are SVD, Triad and Quest methods were shown. In the last chapter, the results of an Extended Kalman Filter implementation of star tracker aided INS were demonstrated. For this implementation, a high altitude aircraft was chosen because star tracker sensor gives more accurate results in high altitudes. To simulate a high altitude aircraft, X-15 aircraft simulation was used in the Airlib library of Simulink. Assumptions were made about the accuracies of the star tracker sensor and INS according to the sensors that can be used in the high altitude aircrafts. Moreover, the simulation architecture of the Kalman Filter implementation, which makes attitude correction, was investigated.

METU Department of Aerospace Engineering

Investigation of the star tracker algorithms and kalman filter integration

open.metu.edu.tr