POLARIS: ESA's airborne ice sounding radar front-end design, performance assessment and first results
ABSTRACT This paper addresses the design, implementation and experimental performance assessment of the RF front-end of an airborne P-band ice sounding radar. The ice sounder design comprises commercial-of-the-shelf modules and newly purpose-built components at a centre frequency of 435 MHz with 20% relative bandwidth. The transmitter uses two amplifiers combined in parallel to generate more than >128 W peak power, with system >60% PAE and 47 dB in-band to out-of-band signal ratio. The four channel receiver features digitally controlled variable gain to achieve more than 100 dB dynamic range, 2.4 dB noise figure, 160 ns receiver recovery time and -46 dBc 3rd order IMD products. The system comprises also, a digital front-end, a digital signal generator, a microstrip antenna array and a control unit. All the subsystems were integrated, certified and functionally tested, and in May 2008 a successful proof-of-concept campaign was organized in Greenland. The system detected the bedrock under 3 km of ice, and internal layers were mapped up to 1.3 km.
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ABSTRACT: An improved lumped-distributed planar 3 dB Wilkinson divider is presented. The technique reduces the number of components and via-grounds. An analysis based on ideal transmission lines provides design equations for the proposed Wilkinson divider. The topology gives good results at L-band and uses less than half of the substrate area of the standard topologyElectronics Letters 05/2001; · 1.04 Impact Factor
Conference Proceeding: Design and performance assessment of an airborne ice sounding radar front-end[show abstract] [hide abstract]
ABSTRACT: The paper describes the design and experimental performance assessment of the RF front-end of an airborne P-band ice sounding radar. The ice sounder design features newly developed components at a centre frequency of 435 MHz, such as, antenna 20% bandwidth at RL < 13 dB, compact high power in-phase and out-of-phase power dividers with a relative bandwidth of 20% and more than 75 W CW power handling, high power SPDT PIN switch with 90 W CW power handling and a 70 W CW high efficiency LDMOS power amplifier with >60% power-added efficiency. The system comprises also a digital signal generator, a digital front-end and a control unit. The system was functionally tested in March 2008 and had a first successful proof-of-concept campaign in Greenland in May 2008.Microwaves, Radar and Remote Sensing Symposium, 2008. MRRS 2008; 10/2008