Far-Field Inversion for the Deep Interior Scanning CubeSat

Takala, Mika; Bambach, Patrick; Deller, Jakob; Vilenus, Esa; Wittig, Manfred; Lentz, H.; Braun, Hans Martin; Kaasalainen, M.; Pursiainen, Sampsa

doi:10.48550/arxiv.1709.04309

Cited by 1 publication

(9 citation statements)

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“…At least the following two different choices for γ will be used: (i) γ ≤ 35 • and (ii) γ ≥ 145 • . The first one of these (i) will enable an enhanced backscattering measurement; our numerical results (Takala et al, 2017a) suggest that with the choice γ = 25 • the accuracy and reliability of the bistatic tomography outcome is superior compared to the monostatic (single-spacecraft) case. The second option (ii) will allow a higher signal-to-noise ratio due to one-way signal paths and tomographic traveltime measurements, performed, e.g., in CONSERT (Takala et al, 2017b;Kofman et al, 2015).…”

Section: Computed Radar Tomographymentioning

confidence: 88%

“…, N are given, i.e., if the stepped-frequency measurement data are available. For a mathematical study of the DISCUS radar, please refer to Takala et al (2017a).…”

Section: Mathematical Conceptmentioning

confidence: 99%

“…In order to obtain an estimate for S R , we simulated the planned radar measurement numerically (Takala et al, 2017a) using a 550 m diameter syn- 1 kg thetic asteroid model based on the surface shape of 1998 KY26 2 (Figure 4). The center frequency of the measurement was assumed to be 20 MHz, the measurement distance 5 km and the number of frequency lines N = 64.…”

Section: Link Budget and Measurement Noisementioning

confidence: 99%

“…On ground, the numerical simulations necessary for inverting the radar measurements can be performed using a state-of-the-art computer or computing cluster with sufficient memory for running iterative wave equation solvers within a three-dimensional computation domain. Our recent simulation study demonstrates that a 2 MHz full-wave (full-bandwidth) data can be computed and inverted for the targeted asteroid size range using a high-end workstation computer equipped with up-to-date graphics processing units (GPUs) (Takala et al, 2017a). The noise levels corresponding to active and quiet Sun and the galactic background have been illustrated with horizontal lines.…”

Section: Computed Radar Tomographymentioning

confidence: 99%

“…The measurement is bistatic, that is, one CubeSat both transmits and receives the signal and the other one serves as an additional receiver. In the measurements, the spacecraft will be placed within a constant angular distance from each other as seen from the asteroid (Takala et al, 2017a).…”

Section: Radar Measurement and Mapping Orbitmentioning

confidence: 99%

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DISCUS – The Deep Interior Scanning CubeSat mission to a rubble pile near-Earth asteroid

Bambach

Deller

Vilenius

et al. 2018

Advances in Space Research

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We have performed an initial stage conceptual design study for the Deep Interior Scanning CubeSat (DIS-CUS), a tandem 6U CubeSat carrying a bistatic radar as the main payload. DISCUS will be operated either as an independent mission or accompanying a larger one. It is designed to determine the internal macroporosity of a 260-600 m diameter Near Earth Asteroid (NEA) from a few kilometers distance. The main goal will be to achieve a global penetration with a low-frequency signal as well as to analyze the scattering strength for various different penetration depths and measurement positions. Moreover, the measurements will be inverted through a computed radar tomography (CRT) approach. The scientific data provided by DISCUS would bring more knowledge of the internal configuration of rubble pile asteroids and their collisional evolution in the Solar System. It would also advance the design of future asteroid deflection concepts. We aim at a single-unit (1U) radar design equipped with a half-wavelength dipole antenna. The radar will utilize a stepped-frequency modulation technique the baseline of which was developed for ESA's technology projects GINGER and PIRA. The radar measurements will be used for CRT and shape reconstruction. The CubeSat will also be equipped with an optical camera system and laser altimeter to support navigation and shape reconstruction. We provide the details of the measurement methods to be applied along with the requirements derived of the known characteristics of rubble pile asteroids. Additionally, an initial design study of the platform and targets accessible within 20 lunar distances is presented.

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Section: Computed Radar Tomographymentioning

confidence: 88%

“…, N are given, i.e., if the stepped-frequency measurement data are available. For a mathematical study of the DISCUS radar, please refer to Takala et al (2017a).…”

Section: Mathematical Conceptmentioning

confidence: 99%

Section: Link Budget and Measurement Noisementioning

confidence: 99%

Section: Computed Radar Tomographymentioning

confidence: 99%

Section: Radar Measurement and Mapping Orbitmentioning

confidence: 99%

See 3 more Smart Citations