Ms. Priyanka Gupta Profile

Priyanka Gupta

at ISRO

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Publications (2)

Proceedings Article | 17 May 2016 Paper

A high-resolution scanning pencil-beam scatterometer: system design challenges

Prantik Chakraborty, Priyanka Gupta, Tapan Misra

Proceedings Volume 9878, 98780R (2016) https://doi.org/10.1117/12.2228162

KEYWORDS: Ku band, Scatterometry, Synthetic aperture radar, Doppler effect, Antennas, Radar, Electroluminescence, Spatial resolution, Space operations, Satellites

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The scanning pencil-beam Scatterometer configuration is pretty effective in covering a large ground-swath by rotating a moderately sized paraboloid dish at a moderate speed. For example, Oscat (Oceansat-II Scatterometer) did cover a ground-swath of 1550km using a 1m diameter reflector that was rotated at 20.5 rpm. The decade-long service (1999-2009) provided by the Seawinds instrument onboard the Quikscat mission followed by an almost half-a-decade (2009-2014) service of Oscat has made this configuration tremendously popular with the global user community. A major drawback of conventional pencil-beam systems like Seawinds and Oscat is the relatively poor spatial resolution. The ground-resolution is beamwidth-limited azimuthally while, in elevation, the resolution is improved by engaging pulse-compression and range-binning. Oscat’s Instantaneous Field of View (IFOV) was 25km wide in azimuth (az) and 50km in elevation (el) at 49° incidence angle. The range-compressed resolution bins had dimensions of 6km (el) x 25km (az). Therefore, qualified wind products could be generated upon square grids no finer than 25km x 25km resolution. According to recommendations of International Ocean Vector Wind Science Team (IOVWST) and Oscat user community, high-resolution scatterometry is the requirement of the day with wind-vector cell-size dimension of 5km or better. One way to improve the resolution is to adopt the SAR principle of Range-Doppler discrimination in the scanning pencil-beam configuration. The footprint can be resolved simultaneously in range as well as in azimuth, thus significantly improving the size of the combined Range-Doppler resolution bin (~ 1km). However, the addition of Doppler filtering to conically scanning radar brings with it its own disadvantages e.g. the limitations of dwell time and the constant change in orientation of isodop lines. This paper presents the constraints in system design of high-resolution scanning systems, the design trade-offs, the methods of handling high PRF, the radar pulsing scheme and the achievable resolution.

Proceedings Article | 5 May 2016 Paper

A novel atmospheric Temperature Sounding Unit: system design and performance analyses

Prantik Chakraborty, Priyanka Gupta, Dilip Dave, Nilesh Desai, Tapan Misra

Proceedings Volume 9876, 98761H (2016) https://doi.org/10.1117/12.2228155

KEYWORDS: Radiometry, Oxygen, Signal attenuation, Sensors, Antennas, Atmospheric modeling, Absorption, Calibration, Reflectors, Polarization

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