PARSAX: Polarimetric Agile Radar in S- and X-band new generation of polarimetric radar

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1 PARSAX: Polarimetric Agile Radar in S- and X-band new generation of polarimetric radar PARSAX Project team: Oleg Krasnov, Leo Ligthart, Zhijian Li, Galina Babur, Fred van der Zwan, Zongbo Wang, Piet van Genderen, Pol Hakkaart, Johan Zijderveld, Pidio Lys, Firat Tigrek, Angie Fasoula, Diana Grama, Frăţilă Radu, He Mi International Research Centre for Telecommunications and Radar (IRCTR), Delft University of Technology Mekelweg 4, 2628 CD, Delft, The Netherlands Opening of the PARSAX radar 29 October

2 E E Radar polarimetry HT VT () t () t H V H V Polarimetric radar Transmitter Receiver Back-scattering polarization matrix S HH (, t τ ) S VH (, t τ ) S (, t τ ) S (, t τ ) HV VV S HH (, t τ ) E HT () t + + S VH (, t τ ) E VT () t S HV (, t τ ) E HT () t + + S (, t τ ) E () t VV VT 2

3 Polarimetric radar sounding signals with dual orthogonality in polarimetric and in time-frequency spaces HH HV VH VV The pair of chirp signals (linearly frequency modulated) with positive and negative frequency excursion Matrix of Ambiguity Functions 3

4 PARSAX: Polarimetric Agile Radar in S- and X-band Atmospheric and ground-based targets Sweep-to-sweep Doppler velocity estimation Modular design with possibility in the future to add X-band front-end S band Antennas Receiver Antenna Transmitter Antenna Transmitter Receiver Waveforms Central frequency: GHz Modulation bandwidth: 2-50 MHz Resolution: 75-3 m Sweep time: 1 ms Two parabolic reflectors Isolation receiver-transmitter: db Diameter: 2.12 m Beam width: 3.5 Gain: db Diameter: 4.28 m Beam width: 1.8 Gain: 40.0 db Solid state power amplifiers 100 Watt max per channel - 80 db attenuators (8 bits control bus) Dynamic range: better 70 db (SFDR) 1 stage down conversion ADC at Intermediate Frequency (125 MHz, sampling 400 MHz, 14 bits) FPGA-based 4 channels digital processor Digital vector waveform generator (sampling up to 1.2 GHz, 16 bits) Linear frequency modulation PCM with orthogonal codes 4

5 PARSAX radar design in case of FMCW signals and de-ramp processing Digital subsystem Analog subsystem 5

6 Antenna System 3.5 Direct coupling: 1.8 HH < -100 db VV < -85 db 6

7 Technological Novelties in the PARSAX design and current state of the system Design and optimization of the PARSAX RF/IF blocks have been done using ADS simulation software Receiver Received signals converted into digital form at IF and then processed real-time in FPGAbased digital receiver Current radar configuration includes two channels receiver and provide already the possibilities to measure all polarimetric information 7

8 Cross-channel interferences suppression HH HV Before VH VV Chimney HH HV After VH VV 8

9 PARSAX, IRCTR TU Delft 9

10 Rain event: October 07, 2009 Ice cloud Melting layer Rain Doppler Spectrograms, 3 m range resolution, 4.4 cm/s velocity resolution, vertically-pointed antenna 10

11 Conclusions Using the orthogonal waveforms as orthogonally-polarized components of the radar sounding signal gives the possibility to measure all elements of the polarization backscattering matrix simultaneously The technological development gives the possibility to implement that principle in the high-resolution radar system for the remote sensing application The basic principles of the PARSAX - high-resolution high-sensitive Doppler polarimetric radar for simultaneous measurement of all elements of scattering matrix has been demonstrated. The radar has very flexible architecture in terms of sounding signals and processing algorithms. In a few months we will have full configuration with 4 parallel channels 11

12 Our thanks for support The STW program officer: P. Schuddeboom THALES: R. de Jongh, A. Smits, A. Brilman, W. Deheij TNO-DSS: A. Huizing, F. Smits KNMI R. Boers Wageningen University and Research Centre R. Uijlenhoet, H. Leijnse 12

13 Our thanks for support IRCTR Project controllers: A. de Ridder, J. Ransun The TU Delft DEMO CEO/CMO team: R. vd Oever, G. Hermans, S. Swanink, Zhao Fu, A.Wattjes, B. Bakker, R. Gommers, E. Born, B. Roessen, A. Beeloo, IJ. Kraus, L. Kuppens, H. Kommers, G. Schotte, M. van der Wel, J. v Meurs, H. Tiggeloven, K. Hoek, H. vd Hoeven, O. Akpinar 13

14 Thank you! 14

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