Kranaatinheitinkomppanian johtaminen paikallishankinnoin

Tutkimuksen aihealueeksi on valittu ”Kranaatinheitinkomppanian johtaminen kaupasta ostettavin tilapäisvälinein”. Rajauksilla tutkimuksen aiheeksi on muodostunut kranaatinheitinkomppanian johtaminen paikallishankinnoin. Tutkielman tarkoituksena on tutkia paikallishankintojen käytettävyyttä kranaatinheitinkomppanian johtamistoiminnassa sotatilanteessa. Tutkielma toimii esimerkkinä uudeksi tavaksi toimia sekä esimerkkinä soveltaa saatavilla olevaa materiaalia Puolustusvoimien käyttötarpeisiin johtamisvälineinä. Paikallishankintana tämä tutkimus käsittelee PMR446- radiopuhelinstandardin käyttöä VHF-kenttäradioiden sijaan. Tarkastelussa on kranaatinheitinkomppanian sekä tulijoukkueen välinen viestitoiminta ja tulijoukkueen sisäinen viestitoiminta. Yhteydet kranaatinheitinkomppaniasta jääkäripataljoonaan toimivat organisaation mukaisella kalustolla. Jääkäripataljoonan taistelun kannalta on kranaatinheitinkomppanian tuki erittäin tärkeä. Kranaatinheitinkomppaniantoiminnan kannalta taas viestiyhteydet ovat ratkaisevia. Viestiyhteyksien tulee olla nopeasti käytössä, reaaliaikaisia, kestäviä ja joukoille suhteellisen helppokäyttöisiä. Viestivälineitä korvatessa tulee valita korvaavaksi välineeksi mahdollisimman samankaltainen viestiväline, jotta viestivälineen käyttöönotto ei rasita joukkoa liian suurella koulutusmäärällä. Tutkimuksessa käytetään laadullista, eli kvalitatiivista tutkimustapaa, jota tukemaan luon myös määrällisiä tuloksia johtamisvälineiden suorituskyvystä. Tutkimus on luonteeltaan kartoittava. Tietoa kerätään tutkimuksessa dokumenttipohjaisesti, koska täten päästään tutkimustulokseen tehokkaimmin. Tutkimalla kranaatinheitinkomppanian tapaa käyttää viestivälineitään taistelussa, kykenen deduktiivisesti perustelemaan paikallishankintojen soveltuvuus3 mahdollisuudet. Perustelut muodostan vertailemalla paikallishankintojen sekä organisaation mukaisten viestivälineiden suorituskykyjä sekä ominaisuuksia. Tutkimuksessa tulevat tulokset ovat sellaisenaan hypoteeseja ja niitä tukemaan voidaan tulevaisuudessa tehdä kvantitatiivisia tutkimuksia. Mikäli PMR446-radiopuhelinten käyttöönottoa harkitaan, tulee vielä tutkia ja vertailla radiopuhelinten todellinen taistelunkestävyys, esimerkiksi pitkässä sota- ja ampumaharjoituksessa. Lisäksi on tutkittava vihollisen elektronisen häirinnän ja elektronisen tiedustelun vaikutus UHF-taajuusalueella toimivaan radiopuhelimeen.

A VLF to UHF propagation model for evaluation of high-speed railway electromagnetic interference in RF monitoring base-stations

Considering that recent european high-speed railway system has a traction power system of kV 50 Hz, which causes electromagnetic emission for the outside world, it is important to dimension the railway system emissions, using a frequency/distance dependent propagation model. This paper presents an enhanced theoretical model for VLF to UHF propagation, railway system oriented. It introduces the near field approach (crucial in low frequency propagation) and also considers the source characteristics and type of measuring antenna. Simulations are presented, and comparisons are set with earlier far field models. Using the developed model, a real case study was performed in partnership with Refer Telecom (portuguese telecom operator for railways). The new propagation model was used in order to predict the future high-speed railway electromagnetic emissions in the Lisbon north track. The results show the model's prediction capabilities and also its applicability to realistic scenarios.

UHF RFID tag antenna for bottle labeling

In this paper we present a possible design for a passive RFID tag antenna on paper substrate to be integrated into bottle labels. Considering the application scenario, we verified and determined the permittivity and dissipation factor of the materials in order to simulate all the possible sources that would influence the antenna performance. The measured results reported a maximum reading range of 1.45 m even though the efficiency obtained with the antenna integrated into the bottle was only of 3%. © 2014 IEEE.

Humidity passive sensors based on UHF RFID using cork dielectric slabs

In this paper we show the design of passive UHF RFID tag antenna on cork substrate. Due to the cork sensitivity to humidity changes, we can use the developed sensor to sense changes in the relative humidity of the environment, without the need for batteries. The antenna is built using inkjet printing technology, which allows a good accuracy of the design manufacturing. The sensor proved usable for humidity changes detection with a variation of threshold power from 11 to 15 dB between 60 and near 100% humidity levels. Presenting, therefore, reading ranges between 3 to 5 meters. © 2015 EurAAP.

Diseño e implementación de un filtro paso banda de banda estrecha con topología interdigital a frecuencias UHF y microondas

Desde el área de Ingeniería de RF del consorcio CELLS y en el marco de un convenio de colaboración firmado con el grupo de antenas y sistemas de microondas del Departamento de Telecomunicación e Ingeniería de sistemas de la ETSE (UAB), se ha planteado la evaluación y construcción de un filtro que formará parte del lazo de control en el módulo de RF. El objetivo es eliminar una señal espuria que se encuentra a la salida de un mezclador en banda lateral única, que por limitaciones en los inbalanceos de ganancia y fase, no termina de cancelar suficientemente la banda rechazada. Por lo tanto, el trabajo surge de la necesidad de diseñar un filtro capaz de obtener una respuesta paso banda centrada a 520 MHz, para atenuar un espurio existente a una frecuencia cercana (530 MHz). En consecuencia, estas especificaciones proporcionarán al filtro la característica de banda estrecha.

Diseño de antenas UHF para aplicaciones RFID

Aquest projecte es basa en l'estudi, disseny i avaluació d'antenes per a aplicacions RFID a la banda UHF. Les etiquetes RFID estan compostes per un xip i una antena que han de presentar una bona adaptació per a aconseguir màxima transferència de potència. Els dos objectius principals en els diferents fases de disseny de cada antena han estat optimitzar les seves dimensions, i incrementar l'ample de banda.

Diseño de enlaces de VHF y UHF [por] Ernesto Tamez E.

UANL

Radio-wave propagation model for UHF band in different climatic conditions with dyadic green’s function

This article proposes a deterministic radio propagation model using dyadic Green's function to predict the value of the electric field. Dyadic is offered as an efficient mathematical tool which has symbolic simplicity and robustness, as well as taking account of the anisotropy of the medium. The proposed model is an important contribution for the UHF band because it considers climatic conditions by changing the constants of the medium. Most models and recommendations that include an approach for climatic conditions, are designed for satellite links, mainly Ku and Ka bands. The results obtained by simulation are compared and validated with data from a Digital Television Station measurement campaigns conducted in the Belém city in Amazon region during two seasons. The proposed model was able to provide satisfactory results by differentiating between the curves for dry and wet soil and these corroborate the measured data, (the RMS errors are between 2-5 dB in the case under study).

Studio e sviluppo di sistemi RFID in banda UHF

The recent widespread diffusion of radio-frequency identification (RFID) applications operating in the UHF band has been supported by both the request for greater interrogation ranges and greater and faster data exchange. UHF-RFID systems, exploiting a physical interaction based on Electromagnetic propagation, introduce many problems that have not been fully explored for the previous generations of RFID systems (e.g. HF). Therefore, the availability of reliable tools for modeling and evaluating the radio-communication between Reader and Tag within an RFID radio-link are needed. The first part of the thesis discuss the impact of real environment on system performance. In particular an analytical closed form formulation for the back-scattered field from the Tag antenna and the formulation for the lower bound of the BER achievable at the Reader side will be presented, considering different possible electromagnetic impairments. By means of the previous formulations, of the analysis of the RFID link operating in near filed conditions and of some electromagnetic/system-level co-simulations, an in-depth study of the dimensioning parameters and the actual performance of the systems will be discussed and analyzed, showing some relevant properties and trade-offs in transponder and reader design. Moreover a new low cost approach to extend the read range of the RFID UHF passive systems will be discussed. Within the scope to check the reliability of the analysis approaches and of innovative proposals, some reference transponder antennas have been designed and extensive measurement campaign has been carried out with satisfactory results. Finally, some commercial ad-hoc transponder for industrial application have been designed within the cooperation with Datalogic s.p.a., some guidelines and results will be briefly presented.

A Survey of consumer attitudes and experience regarding UHF television /

Item 285

Frequency management engineering principles VHF/UHF/SHF communication links.

"May 13, 1981."

Theory of UHF and microwave measurements using the power equation concept. /

Includes bibliographical references (p. 51-52).

Introduction to UHF circuits and components.

"Based on an earlier work entitled UHF radio simplified, by M.S. Kiver."

Especificações e concepções de front-end UHF integrado e multipadrão em tecnologia CMOS 130nm

The Brazilian Environmental Data Collecting System (SBCDA) collects and broadcasts meteorological and environmental data, to be handled by dozens of institutions and organizations. The system space segment, composed by the data collecting satellites, plays an important role for the system operation. To ensure the continuity and quality of these services, efforts are being made to the development of new satellite architectures. Aiming a reduction of size and power consumption, the design of an integrated circuit containing a receiver front-end is proposed, to be embedded in the next SBCDA satellite generations. The circuit will also operate under the requirements of the international data collecting standard ARGOS. This work focuses on the design of an UHF low noise amplifier and mixers in a CMOS standard technology. The specifi- cations are firstly described and the circuit topologies presented. Then the circuit conception is discussed and the design variables derived. Finally, the layout is designed and the final results are commented. The chip will be fabricated in a 130 nm technology from ST Microelectronics.

Misura UHF (Ultra High Frequency) delle scariche parziali nei sistemi isolati a gas: metodologie per la verifica della sensibilità di misura

Le apparecchiature di manovra tramite isolamento a gas (GIS) sono in funzione da più di 45 anni e hanno dimostrato un alto livello di affidabilità, con tassi di difetto molto bassi. Tuttavia, il riscontro pratico indica che alcuni dei guasti che si verificano durante il servizio sono legati a difetti del sistema di isolamento. Molti di questi difetti possono essere rilevati tramite diagnostica con scariche parziali (PD). Per la rilevazione PD, viene utilizzato il metodo UHF perché meno sensibile ai disturbi e quindi più facile da gestire in confronto al metodo convenzionale secondo IEC 60270. Un rapporto di Electra pubblicato nel 1999 dal CIGRE Task Force 15/33.03.05 descrive la procedura in due fasi per la verifica della sensibilità del sistema UHF in modo molto generale. Dopo 15 anni dalla sua applicazione, è diventata necessaria una descrizione più dettagliata, sia su misure necessarie al test di laboratorio (Passaggio 1) che sul test in loco (Passaggio 2).