FPGA-based digital signal processing for the next generation radio astronomy instruments: ultra-pure sideband separation and polarization detection

Alvear, A.; Finger, Ricardo; Fuentes, Roberto Gomez; Sapunar, Raúl; Geelen, Tom; Curotto, Franco; Rodríguez, Rafael; Monasterio, David; Reyes, Nicolás; Mena, Patricio; Bronfman, L.

doi:10.1117/12.2233090

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…In addition, they are correlated in real-time which allows to derive the V-Stokes parameter and, hence, the left and right circular polarization spectra of the radiation. Similar digital spectrometers have been used previously for polarimetric observations in radio astronomy [15], but to our knowledge not for atmospheric remote sensing.…”

Section: Instrument Descriptionmentioning

confidence: 99%

Development of a Polarimetric 50-GHz Spectrometer for Temperature Sounding in the Middle Atmosphere

Krochin

Stober

Murk

2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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This paper addresses the further development of the groundbased temperature radiometer TEMPERA which measures atmospheric microwave radiation in one linear polarization in order to retrieve temperature profiles up to an altitude of 50 km [1]. The latest innovation is a new polarimetric receiver, which allows observing the atmosphere simultaneously in left-and right circular polarization. In combination with an adapted inversion method, the fully polarimetric analysis can improve the accuracy and extends the vertical upper limit of retrieved temperature profiles. Comparisons between single polarization and fully polarimetric retrievals with simulated atmospheric spectra are presented and the influence of the Earth's magnetic field is analysed. In addition, we propose a simple calibration method for fully polarimetric radiometers and present first atmospheric spectra measured with the new TEMPERA-C instrument.

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Section: Instrument Descriptionmentioning

confidence: 99%

Development of a Polarimetric 50-GHz Spectrometer for Temperature Sounding in the Middle Atmosphere

Krochin

Stober

Murk

2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…In addition, they are correlated in real time, which allows us to derive the V -Stokes parameter and, hence, the left-and right-circular polarization spectra of the radiation. Similar digital spectrometers have been used previously for polarimetric observations in radio astronomy [15], but to our knowledge not for atmospheric remote sensing. Fig.…”

Section: Instrument Descriptionmentioning

confidence: 99%

Development of a Polarimetric 50 GHz Spectrometer for Temperature Sounding in the Middle Atmosphere

Krochin

Stober

Murk

2021

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS

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This article addresses the further development of the ground-based temperature radiometer TEMPERA, which measures atmospheric microwave radiation in one linear polarization in order to retrieve temperature profiles up to an altitude of 50 km (Stähli et al., 2013). The latest innovation is a new polarimetric receiver, which allows observing the atmosphere simultaneously in left-and right-circular polarization. In combination with an adapted inversion method, the fully polarimetric analysis can improve the accuracy and extends the vertical upper limit of retrieved temperature profiles. Comparisons between single polarization and fully polarimetric retrievals with simulated atmospheric spectra are presented, and the influence of the Earth's magnetic field is analyzed. In addition, we propose a simple calibration method for fully polarimetric radiometers and present first atmospheric spectra measured with the new TEMPERA-C instrument.

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“…This work presents a new algorithm for calibrating the channels of the GSENSE image sensor as the main innovation of this work. FPGA devices have proven to be ideal for implementing algorithms for images coming from cameras for astrophysical applications [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. We have had to design at a low level (structural level) because the data sent by the image sensor to the FPGA cannot be deserialized with the ISERDES IP available in the Vivado suite.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Channel Calibration for the Image Sensor of the TuMag Instrument

Magdaleno

Valido

Hernández

et al. 2022

Sensors

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The Sunrise missions consist of observing the magnetic field of the sun continuously for a few days from the stratosphere. In these missions, a balloon supporting a telescope and associated instrumentation, including a Tunable Magnetograph (TuMag), is lifted into the stratosphere. In the camera of this instrument, the image sensor sends its data to a Field Programmable Gate Array (FPGA) using eight transmission channels. These channels must be previously calibrated for a correct delivery of the image. For this mission, the FPGA has been exchanged for a newer and larger one, so the firmware has been adapted to the new device. In addition, the calibration algorithm has been parallelized as the main innovation of this work, taking advantage of the increase in logic resources of the new FPGA, in order to minimize the calibration time of the channels. The algorithm has been implemented specifically for this instrument without using the Input Serial Deserializer (ISERDES) Intellectual Property (IP), since this IP does not support the deserialization of the data sent by the image sensor to the FPGA.

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FPGA-based digital signal processing for the next generation radio astronomy instruments: ultra-pure sideband separation and polarization detection

Cited by 5 publications

References 4 publications

Development of a Polarimetric 50-GHz Spectrometer for Temperature Sounding in the Middle Atmosphere

Development of a Polarimetric 50-GHz Spectrometer for Temperature Sounding in the Middle Atmosphere

Development of a Polarimetric 50 GHz Spectrometer for Temperature Sounding in the Middle Atmosphere

Enhanced Channel Calibration for the Image Sensor of the TuMag Instrument

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