journal article·2025-12-30Open access

EsTRACE—Es-Layer TRAnsient Cloud Explorer: PlanarSat Mission Concept and Early-Phase Design (Bid, CoDR, PDR) for Sporadic-E Sensing

Mehmet Şevket Uludağ, Alim Rüstem Aslan

Applied Sciences· Volume 16· Issue 1

Abstract

Sporadic-E (Es) layers can strongly perturb HF/VHF propagation and create intermittent interference, motivating higher-revisit monitoring at the frequencies most affected. EsTRACE (Es-layer TRAnsient Cloud Explorer) is a PlanarSat mission concept that transmits sequential beacons in the 28/50 MHz amateur bands using FT4 (weak-signal digital) and CW (continuous wave) waveforms and leverages distributed amateur receiver networks for near-real-time SNR mapping. This paper documents the early-phase spacecraft design from the Bid/proposal phase (Bid), through the Conceptual Design Review (CoDR), to the Preliminary Design Review (PDR), using a power-first sizing loop that couples link-budget closure to duty cycle and solar-array area under a free-tumbling, batteryless constraint. The analysis supports conceptual feasibility of the architecture under stated antenna and ground-segment assumptions; on-orbit demonstration and measured RF/antenna characterization are identified as required future validation steps.
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Research context

OpenAlex topics: Spacecraft Design and Technology · Satellite Communication Systems · Soil Moisture and Remote Sensing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS Delft, The Netherlands

Faculty of Aeronautics and Astronautics, Istanbul Technical University, Ayazağa Campus, 34469 Maslak, Istanbul, Turkey

References (68)

Show source-provided references
1. Vanhamel, J., Berwaerts, M., Speretta, S., and Uludag, S. (2024). Concept of Sporadic E Monitoring Using Space-Based Low Power Multiple Beacon-Systems. Atmosphere, 15.10.3390/atmos15111306 ↗
2. Midlatitude Sporadic E: A Typical Paradigm of Ionospheric Complexity10.1007/s11214-011-9786-8 ↗
3. Recent Work on Mid-Latitude and Equatorial Sporadic E10.1016/0021-9169(89)90122-0 ↗
4. International Telecommunication Union (2019). Handbook on Spectrum Monitoring, ITU.
5. European Space Agency (2021). Space Weather Impacts on Radio Communication and Navigation Systems, European Space Agency.
6. Monitoring of Global Ionospheric Irregularities Using the Worldwide GPS Network10.1029/97GL02273 ↗
7. Electron density and plasma waves in mid-latitude sporadic-E layer observed during the SEEK-2 campaign10.5194/angeo-23-2335-2005 ↗
8. An Improved Ionosonde-Based Parameter to Assess Sporadic E Layer Intensities: A Simple Idea and an Algorithm10.1029/2018JA026441 ↗
9. Semidiurnal tidal signature in sporadic E occurrence rates derived from GPS radio occultation measurements at higher midlatitudes10.5194/angeo-27-2555-2009 ↗
10. Semi-supervised classification of lower-ionospheric perturbations using GNSS radio occultation observations from Spire Global’s CubeSat constellation10.1051/swsc/2022009 ↗
11. Emmons, D.J., Wu, D.L., Swarnalingam, N., Ali, A.F., Ellis, J.A., Fitch, K.E., and Obenberger, K.S. (2024). Improved models for estimating sporadic-E intensity from GNSS radio occultation measurements. Front. Astron. Space Sci., 10.10.3389/fspas.2023.1327979 ↗
12. Ionospheric Time-Delay Algorithm for Single-Frequency GPS Users10.1109/TAES.1987.310829 ↗
13. First results of mapping sporadic E with a passive observing network10.1029/2011SW000678 ↗
14. American Radio Relay League (ARRL) (2022). The ARRL Handbook for Radio Communications, ARRL.
15. Modern Small Satellites-Changing the Economics of Space10.1109/JPROC.2018.2806218 ↗
16. Highly-miniaturized spacecraft “PlanarSat”: Evaluating prospects and challenges through a survey of femto & atto satellite missions10.1016/j.actaastro.2025.05.018 ↗
17. PUCP Team PUCP-Sat-1 & Pocket-PUCP, Instituto de Radioastronomía, Pontificia Universidad Católica del Perú (PUCP). Available online: https://inras.pucp.edu.pe/project/pucp-sat-1-pocket-pucp.
18. The design and experiment of stardust femto-satellite10.1016/j.actaastro.2020.04.034 ↗
19. Kacapyr, S. (Cornell Chronicle, 2019). Cracker-sized satellites demonstrate new space tech, Cornell Chronicle.
20. Manchester, Z., Peck, M., and Filo, A. (2025, November 10). KickSat: A Crowd-Funded Mission To Demonstrate The World’s Smallest Spacecraft. 2013, SSC13–IX–5. Available online: https://digitalcommons.usu.edu/smallsat/2013/all2013/111/.
21. Vidal-Valladares, M.G., and Díaz, M.A. (2022). A Femto-Satellite Localization Method Based on TDOA and AOA Using Two CubeSats. Remote Sens., 14.10.3390/rs14051101 ↗
22. Active attitude control for microspacecraft: A survey and new embedded designs10.1016/j.asr.2022.02.020 ↗
23. A low-cost femtosatellite to enable distributed space missions10.1016/j.actaastro.2009.01.025 ↗
24. Hein, A.M., Burkhardt, Z., and Eubanks, T.M. (2019). AttoSats: ChipSats, other Gram-Scale Spacecraft, and Beyond. arXiv.
25. Uludağ, M.Ş., and Aslan, A.R. (2025). Power Contingency/Margin Methodology and Operational Envelope Analysis for PlanarSats. Aerospace, 12.10.20944/preprints202506.2354.v1 ↗
26. Uludağ, M.Ş., and Aslan, A.R. (2025). An Analytical Framework for Determining the Minimum Size of Highly Miniaturized Satellites: PlanarSats. Aerospace, 12.10.3390/aerospace12100876 ↗
27. Taylor, J., Franke, S., and Somerville, B. (2019). The FT4 Protocol for Digital Contesting, Available online: https://wsjt.sourceforge.io/FT4_Protocol.pdf.
28. Council, N.R. (2000). The Role of Small Satellites in NASA and NOAA Earth Observation Programs, National Academies Press.
29. Wertz, J.R., Everett, D.F., and Puschell, J.J. (2011). Space Mission Engineering: The New SMAD, Microcosm Press.
30. Franke, S., Somerville, B., and Taylor, J.H. The FT4 and FT8 Communication Protocols, American Radio Relay League (ARRL). Available online: https://wsjt.sourceforge.io/FT4_FT8_QEX.pdf.
31. International Telecommunication Union (2001). Recommendation ITU-R SM.1132-2: General Principles and Methods for Sharing Between Radiocommunication Services or Between Radio Stations, ITU Radiocommunication Sector (ITU-R). Recommendation SM.1132-2.
32. Taylor, J.H. (2023). WSJT-X User Guide, WSJT Development Group (WSJT-X Project). Available online: https://wsjt.sourceforge.io/wsjtx-doc/wsjtx-main-2.6.0.pdf.
33. International Telecommunication Union, Radiocommunication Sector (ITU-R) (2000). Determination of the G/T Ratio for Earth Stations Operating with Communication Satellites, ITU-R. Technical Report Recommendation S.733-2.
34. International Telecommunication Union, Radiocommunication Sector (ITU-R) (2016). Calculation of Free-Space Attenuation, ITU-R. Technical Report Recommendation P.525-3.
35. Davies, K. (1990). Ionospheric Radio, Peter Peregrinus Ltd.10.1049/PBEW031E ↗
36. International Telecommunication Union, Radiocommunication Sector (ITU-R) (2023). Propagation Data and Prediction Methods Required for the Design of Earth-Space Telecommunication Systems, ITU-R. Technical Report Recommendation ITU-R P.618-14.
37. International Telecommunication Union, Radiocommunication Sector (ITU-R) (2019). Attenuation by Atmospheric Gases and Related Effects, ITU-R. Technical Report Recommendation ITU-R P.676-12.
38. International Telecommunication Union, Radiocommunication Sector (ITU-R) (2024). Radio Noise, ITU-R. Technical Report Recommendation P.372-17.
39. A model of diffuse Galactic radio emission from 10 MHz to 100 GHz10.1111/j.1365-2966.2008.13376.x ↗
40. The CubeSat Program (Cal Poly SLO) (2014). CubeSat Design Specification (CDS), California Polytechnic State University. Available online: https://www.cubesat.org/s/cds_rev13_final2.pdf.
41. International Telecommunication Union, Radiocommunication Sector (ITU-R) (2023). Handbook on Small Satellites, ITU.
42. Broekhuizen, C.H., Speretta, S., Uludag, M.S., van den Bos, M.F., Haenen, J., Menicucci, A., and Gill, E.K.A. (2020, January 1–6). Miniaturized Radio Tranceiver for PocketQubes, Exceeding Performance of CubeSat Solutions. Proceedings of the 34th Annual AIAA/USU Conference on Small Satellites (SmallSat 2020), Logan, UT, USA. Paper SSC20-WKVIII-04.
43. National Renewable Energy Laboratory (2025, November 28). Interactive Best Research-Cell Efficiency Chart, Available online: https://www.nrel.gov/pv/interactive-cell-efficiency.html.
44. Speretta, S., van der Zwaard, R.K., and Uludag, M.S. (, January 4–8). Autonomous formation flying in the traffic. Proceedings of the Small Satellites for Earth Observation, Berlin, Germany.
45. STMicroelectronics (2024). STM32L496RG—Ultra-Low-Power with FPU Arm Cortex-M4 MCU 80 MHz with 1 Mbyte Flash, USB OTG, LCD, DFSDM, STMicroelectronics. Available online: https://www.st.com/en/microcontrollers-microprocessors/stm32l496rg.html.
46. Semtech Corporation (2024). SX1278—137MHz to 525MHz Low Power Long Range Transceiver, Semtech Corporation. Available online: https://www.semtech.com/products/wireless-rf/lora-connect/sx1278.
47. Qorvo, Inc. (2024). SPF5043Z—50 to 4000 MHz General Purpose, Low Noise, Gain Block Datasheet, Qorvo, Inc.. Available online: https://www.qorvo.com/products/p/SPF5043Z.
48. Qorvo, Inc. (2012). RFPA0133—380–960 MHz Programmable Gain High-Efficiency Power Amplifier, Qorvo, Inc.. Available online: https://www.qorvo.com/products/p/RFPA0133.
49. Azur Space (2025, December 18). 3G30A Triple-Junction Solar Cell Assembly Datasheet, Available online: https://www.azurspace.com/media/uploads/file_links/file/bdb_00010891-01-00_tj3g30-advanced_4x8.pdf.
50. STMicroelectronics (2021). SPV1040—High-Efficiency Solar Battery Charger with Embedded MPPT, STMicroelectronics. Available online: https://www.st.com/en/power-management/spv1040.html.
51. STMicroelectronics NV (2018). High Efficiency Single Inductor Dual Mode Buck-Boost DC-DC Converter with 2.3 A Switches Peak Current—Datasheet, STMicroelectronics NV. Available online: https://www.st.com/resource/en/datasheet/stbb1-axx.pdf.
52. RAMXEED Limited (2024). MB85RS4MTY—4 M (512 K × 8) Bit SPI FeRAM Datasheet (AEC -Q100 Compliant), RAMXEED Limited. Available online: https://www.ramxeed.com/assets/images/products/datasheet/FeRAM/s2/MB85RS4MTY-GS-DS3v0-E.pdf.
53. Analog Devices, Inc. (2021). LTC4368—100 V UV/OV and Reverse Protection Controller with Bidirectional Circuit Breaker Datasheet, Analog Devices, Inc.. Available online: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4368.pdf.
54. Texas Instruments Incorporated (2024). TPS3813xxx Family—Processor Supervisory Circuits with Window-Watchdog Datasheet, Texas Instruments Incorporated. Available online: https://www.ti.com/lit/ds/symlink/tps3813.pdf.
55. Colagrossi, A., Lunghi, P., Pompa, L., Semprebon, A., Parissenti, G., and Lavagna, M. (2017, January 3–6). FEES: A 1/3U Cubesat Mission for In-Orbit Technology Validation. Proceedings of the 7th European Conference for Aeronautics and Aerospace Sciences (EUCASS 2017), Milan, Italy.
56. Hofman, J., Sharp, R., and Haze, J. (2017, January 30). New Techniques for Radiation Testing of CubeSats. Proceedings of the 6th Interplanetary CubeSat Workshop (iCubeSat 2017), Cambridge, UK. Talk B.4.2.
57. Uludag, M.S., Speretta, S., Menicucci, A., and Gill, E.K.A. (2023, January 3–9). Journey of a PocketQube: Concept to Orbit. Proceedings of the 34th International Symposium on Space Technology and Science, Kurume, Japan.
58. Uludag, M.S., and Speretta, S. (October, January 29). Delfi-PQ: In-Orbit Performance and Lessons Learned in Developing a 3P PocketQube. Proceedings of the 76th International Astronautical Congress (IAC 2025), Sydney, Australia. Paper IAC-25-B4-6B-6-x100349.
59. European Space Agency (2021). Call for a Medium-Size and a Fast Mission in ESA’s Science Programme (M7 and F2)—Technical Annex, European Space Agency (ESA). Technical Report Technical Annex.
60. NASA Small Spacecraft Systems Virtual Institute (S3VI) (2025, November 19). 11.0 Ground Data Systems and Mission Operations, Available online: https://www.nasa.gov/smallsat-institute/sst-soa/ground-data-systems-and-mission-operations/.
61. Japan Aerospace Exploration Agency (JAXA) (2013). RF Link Design Standard, JAXA Safety and Reliability Promotion Department. Technical Report JERG-2-400A.
62. Band-monitoring Payload for a CubeSat Satellite
63. International Telecommunication Union, Radiocommunication Sector (ITU-R) (2025). Ionospheric Propagation Data and Prediction Methods Required for the Design of Satellite Networks and Systems, ITU-R. Technical Report Recommendation P.531-16.
64. European Space Agency (ESA) (2008). ECSS-E-ST-70C: Ground Systems and Operations, European Space Agency (ESA). ECSS Standard for Ground Systems and Operations.
65. ITU (2013). Reference Link Budgets and Minimum Performance Requirements for Satellite Communications, International Telecommunication Union. ITU-R Recommendation SA.1157-3.
66. Texas Instruments Incorporated (2024). INA226—Bi-Directional, Low- or High-Side Measurement, Current/Power Monitor with I2C Interface, Texas Instruments. Available online: https://www.ti.com/lit/ds/symlink/ina226.pdf.
67. Texas Instruments Incorporated (2024). TPS255xx Precision Adjustable Current-Limited Power-Distribution Switches, Texas Instruments. Available online: https://www.ti.com/lit/ds/symlink/tps2553.pdf.
68. Markley, F.L., and Crassidis, J.L. (2014). Fundamentals of Spacecraft Attitude Determination and Control, Springer.10.1007/978-1-4939-0802-8 ↗