RIMFAX
 RIMFAX radar imager | |
| Operator | NASA |
|---|---|
| Manufacturer | Norwegian Defence Research Establishment |
| Instrument type | Ground-penetrating radar |
| Function | Study subsurface structure |
| Properties | |
| Mass | 3 kg (6.6 lb) |
| Dimensions | 19.6 × 12.0 × 0.66 cm |
| Power consumption | Max: 10 watts |
| Resolution | 15 cm to 30 cm (3" to 12") |
| Host spacecraft | |
| Spacecraft | Perseverance |
| Operator | NASA |
| Launch date | 30 July 2020, 11:50:00 UTC |
| Rocket | Atlas V |
| Launch site | Cape Canaveral, SLC-41 |
| COSPAR ID | 2020-052A |
The Radar Imager for Mars' subsurface experiment (RIMFAX) is a ground-penetrating radar on NASA's Perseverance rover, part of the Mars 2020 mission. It uses radar waves to see geologic features under the surface.
The device can make detections perhaps dozens of meters/yards underneath ground, such as for buried sand dunes or lava feature.[1] During development a detection range of about 10 yards/meters was targeted, and tests on glaciers were successful.[2]
RIMFAX takes its name from Hrímfaxi, the horse in Norse mythology that "faithfully brings the night."[3]
The radar will operate at radio frequencies of 150–1200 MHz and will use a Bow-Tie Slot antenna.[4]
Overview
RIMFAX is a ground-penetrating radar, its antenna is located on the lower rear of the Perseverance rover. It will be able to image different ground densities, structural layers, buried rocks, meteorites, and detect underground water ice and salty brine at 10 m (33 ft) depth.
Ground-penetrating radars (GPR) send radio frequency electromagnetic waves into the ground and then detect the reflected signals as a function of time to reveal subsurface structure as well as composition. RIMFAX is based on a number of GPR instruments developed at the Norwegian Defence Research Establishment (FFI).[5] RIMFAX was selected by NASA to be one of the instruments on the Mars 2020 rover in July 2014. RIMFAX will provide the science team with the capability to assess the shallow layers and their stratigraphic relationship to nearby outcrops, and thus a window into the geological history and associated environmental history.[5]
The RIMFAX instrument was developed and built by FFI, and it was delivered to NASA's Jet Propulsion Laboratory for integration with the rover in December 2018. The RIMFAX operations center will be located at the University of California, Los Angeles (UCLA). The data will be archived by NASA's Planetary Data System and can be processed with gprMax, an open source electromagnetic simulation tool.[6][7] The RIMFAX principal investigator is Svein-Erik Hamran of FFI, and his team includes scientists from Norway, Canada and the United States.[8]
Specifications
RIMFAX employs a gated Frequency Modulated Continuous Wave (FMCW) waveform to probe the subsurface. Gated FMCW utilizes a single antenna for both transmission and reception, quickly switching the antenna between the transmitter and the receiver. RIMFAX will be commanded to acquire radar soundings every 10–20 cm along the rover's path to create two-dimensional GPR images of subsurface structure.
| Specifications | Units/performance[3][5] |
|---|---|
| Mass | 3 kg (6.6 lb) |
| Power | 5 to 10 watts |
| Dimensions | 19.6 × 12.0 × 0.66 cm (7.0" × 4.7" × 2.4") |
| Data return | 5 to 10 kbytes per sounding location |
| Frequency range | 150 to 1200 MHz |
| Vertical resolution | 15 cm to 30 cm (6" to 12") |
| Penetration depth | ≤10 m (33 ft) |
| Measurement interval |
Every 10 cm (3.9 in) |
Contemporaries
Other Mars radar experiments include SHARAD, MARSIS, and WISDOM.[9]
See also
External links
- NASA project homepage
- FFI project homepage
References
- ^ "Next Mars rover will use 'X-ray vision' to spot buried treasure". CBC News. Retrieved 24 January 2018.
- ^ Hamran, S. E.; Berger, T.; Brovoll, S.; Damsgård, L.; Helleren, Ø.; Øyan, M. J.; Amundsen, H. E.; Carter, L.; Ghent, R. (July 2015). "RIMFAX: A GPR for the Mars 2020 rover mission". 2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR): 1–4. doi:10.1109/IWAGPR.2015.7292690. ISBN 978-1-4799-6495-6.
- ^ a b "Mars 2020 Rover - RIMFAX". NASA. 2017. Retrieved 22 October 2017.
This article incorporates text from this source, which is in the public domain.
- ^ "RIMFAX: A GPR for the Mars 2020 rover mission - IEEE Conference Publication" (Document). doi:10.1109/IWAGPR.2015.7292690.
{{cite document}}: Cite document requires|publisher=(help) - ^ a b c "RIMFAX - ground penetrating radar". Norwegian Defence Research Establishment. 14 August 2015. Retrieved 17 December 2020.
- ^ Svein-Erik Hamran; David A. Paige; Hans E.F. Amundsen; et al. (3 November 2020). "Radar Imager for Mars' Subsurface Experiment—RIMFAX" (PDF). Space Science Reviews. 216 (8). 128. Bibcode:2020SSRv..216..128H. doi:10.1007/S11214-020-00740-4. ISSN 0038-6308. Wikidata Q105715907.
Numerical simulations are carried out with gprMax (Warren et al. 2016) employing a finite-difference time-domain (FDTD) algorithm (Yee 1966) for simulating the propagation of radar waves in three dimensions through complex media.
- ^ Craig Warren; Antonios Giannopoulos; Iraklis Giannakis (December 2016). "gprMax: Open source software to simulate electromagnetic wave propagation for Ground Penetrating Radar". Computer Physics Communications. 209: 163–170. doi:10.1016/J.CPC.2016.08.020. ISSN 0010-4655. Wikidata Q64455906.
- ^ "RIMFAX science team". Norwegian Defence Research Establishment. 19 September 2014. Archived from the original on 25 April 2019. Retrieved 28 March 2021.
- ^ Svein-Erik Hamran; Hans E.F. Amundsen; Lynn Carter; Rebecca Ghent; Jack Kohler; Michael Mellon; David Paige (2014). "THE GROUND PENETRATING RADAR RIMFAX ON THE MARS 2020 MISSION" (PDF). Proceedings of the International Workshop on Instrumentation for Planetary Missions. S2CID 4975188. Wikidata Q105725095. Archived from the original (PDF) on 28 March 2021.
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