Doppler Correction Of The Telecommunications Oscillators In The UK T -SAT Payload J. Austin. E. Vilar. J. Domokos ABSTRACT The article gives values for the doppler shift of an L-band radio path between a UK observer and a 12 h period Molnya orbit satellite. Two doppler correction units for the local oscillators of the UK T -SAT payload are described, one utilising frequency locking and the othe

A Microcomputer-Controlled With SAW-Convolver B. Wigger, Pseudo Noise Modulated For Signal Processing E. Besenfelder CW-Radar W. Knapp, Abstract In the past there was a rapid development of new components for matched filtering of signals with large time-bandwidth-product on the basis of surface acoustic waves (SAW). Such components, as there is the SAW-Convolver /1/, allow the realization of v

AN AGILE MICROWAVE FREQUENCY HIGH SPECTRAL PURITY SYNTHESISER WITH D. A. BROWN * and J. CLARKE + ABSTRACT The key performance features of microwave frequency synthesisers for future radar systems are outlined and a source employing a new technique to meet these requirements is described, which provides a stable, coherent high spectral purity output frequency with agility over multiple chann

OPTICAL RECEIVE PHASE AND MODULE GAIN CONTROL OF A GaAs MMIC TRANSMIT - P.R. Herczfeld*, A. Rosen * * ABSTRACT A. Paolella+, A. Daryoush* and W. Jemison* and This paper reports on the optical phase and gain control of a GaAs MMIC phase shifter and amplifier with applications for active phased array antennas. Phase shifts of 40 degrees were obtained with 50 µw of optical power and ampli

94 GHz IMAGING RADAR FOR AUTONOMOUS VEHICLES M. Lange, J. Detlefsen, M. Bockmair * Introduction Autonomously moving vehicles, which operate in a fully or partially unknown environment, require rea1time sensor information about their surroundings. As every type of sensor has some sensortypical limitations, which means, there are situations, where the sensor can not supply suitable informat

MICROWAVE FREQUENCY AGILE SOURCE FOR COHERENT RADAR APPLICATIONS H. MCPherson*, T.A. Walls**, F.S. Brown* ABSTRACT The characteristics required of a microwave frequency agile source suitable for modern coherent radar applications are discussed. A design is presented for a source which is capable of generating a relatively large number of channels with minimum compromise to spectral purity. Bas

NONRECIPROCAL STRUCTURES USING COUPLED MAGNETIZED IN THE PROPAGATION DffiECTION Jerzy Mazur, ABSTRACT. Michal Mrozowski* FERRITE LINES Nonreciprocal devices based on the section of two coupled lines containing ferrite magnetized in the propagation direction are investigated using the coupled mode method. It is found that the gyromagnetic medium causes coupling between even and odd modes support

THEORY AND DESIGN OF 20/30 GHZ BAND TMOl/HE21 MODE TRACKING COUPLER Alexi KHAMMOUNI and Pascal DUTRIAUX ABSTRACT The paper presents the design and testing of 20/30 GHZ band tracking coupler. It will be integrated to a tracking four ports, linear polarized feed system. The tracking modes TMOI and HE21 are coupled, by means of Tchebitchef coupling holes, in secondary waveguides having the same

A SIX-PORT HYBRID - RING MICROSTRIP ************************ DIRECTIONAL COUPLER Sami N. KAROOMI - Yves GARAUL T Abstract: A six-port hybrid-ring -6dB directional coupler has been ana lysed by using the method of even and odd modes. Good agreements between predicated and obtained S-parameters have been ascertained, verifing the validity of the even and odd modes method for calculating a new

NEW TYPE OF BRANCH-LINE HYBRIOS* H.A~hoka** ABSTRACT New type of branch-line hybrids which provide the designer with a great degree of freedom in the choice of line impedances is presented. The hybrids can also be experimentally tuned to correct any imbalance in the outputs or to shift the frequency of operation, thus reducing the development effort.