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Alongside communications and navigation equipment, the scientific payload of the satellite would include three instruments: the cryogenic solar absolute radiometer (CSAR), the onboard calibration system (OBCS), and the hyperspectral imaging spectrometer (HIS). The instruments would produce global
263:
aboard a satellite. The OBCS would "....transfer calibration traceability from the SI defining power measurement...to a full spectrally resolved radiance calibration of an instrument" – in the case of TRUTHS from the CSAR to the HIS – in a simplified manner to the steps used by terrestrial
321:
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institutes for radiometric measurements and "recommended as the means to achieve SI traceability". The CSAR, which would be cooled to <60 K, is therefore considered "the heart of the calibration system". The mission would be the first to host a
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In order to obtain both scientific and financial support for the mission, many reports and academic publications were produced by Fox and collaborators over several decades.
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other sensors, facilitating an upgrade to the performance of the global Earth observing system to ensure interoperability and robust anchoring to an SI reference in space."
1008:
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Traceable
Radiometry Underpinning Terrestrial- and Helio- Studies (TRUTHS) – A 'gold standard' imaging spectrometer in space to support climate emergency reseaerch
646:
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366:
272:
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2019 – Adopted at the ESA ministerial conference, with 85% funding from the UK. The remainder from
Switzerland, Greece, Czechia, and Romania.
759:"Traceable Radiometry Underpinning Terrestrial- and Helio-Studies (TRUTHS): An Element of a Space-Based Climate and Calibration Observatory"
707:"Traceable Radiometery Underpinning Terrestrial- and Helio- Studies (TRUTHS): Establishing a climate and calibration observatory in space"
982:
549:
666:
Fox, Nigel P.; Aiken, James; et al. (2003-04-08). Fujisada, Hiroyuki; Lurie, Joan B.; Aten, Michelle L.; Weber, Konradin (eds.).
418:, to Airbus UK for design and development; and to Teledyne e2v to construct the hyperspectral imaging spectrometer detection system.
736:
SI-traceable space-based climate observation system: a CEOS and GSICS Workshop. National
Physical Laboratory, UK, 9-11 Sept 2019
411:
2022 – Passed preliminary design, technical, and scientific reviews. Received further funding at the ESA ministerial conference.
312:
A secondary objective of the mission is the use the global hyperspectral data to "constrain and improve retrieval algorithms".
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institutes. The HIS can then be used to image the Earth, the Moon, and also to "measure incident solar spectral irradiance."
1157:
219:
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222:-traceable satellites" (SITSats) that will enable other EO missions to calibrate measurements with reference to them.
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958:"Airbus wins European Space Agency TRUTHS mission study for metrological traceability of Earth observation data"
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The mission would have a targeted duration of eight or more years, and a minimum duration of five.
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Philosophical
Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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by an order of magnitude, enabling detection of climate signals in the shortest possible time."
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of the Earth’s incoming and outgoing radiation to enhance our ability to estimate the
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550:"TRUTHS (Traceable Radiometry Underpinning Terrestrial-and Helio-Studies) - eoPortal"
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983:"Teledyne e2v to supply Infrared detector for TRUTHS Climate Change Satellite"
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275:(NPL) and its lead scientist for EO, Nigel Fox. It has two primary objectives:
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668:"Traceable radiometry underpinning terrestrial- and helio-studies (TRUTHS)"
231:
hyperspectral (320 nm to 2400 nm) measurements of "top-of-atmosphere earth
1009:"UK-Led TRUTH Mission to Fight Climate Change Moves to Early Design Phase"
573:
462:"THE CEOS DATABASE : MISSION, INSTRUMENTS AND MEASUREMENTS - TRUTHS"
808:"Accurate radiometry from space: an essential tool for climate studies"
783:
758:
442:
239:(both total and spectrally resolved, 0.02% and 0.3% respectively); and
1033:"The TRUTHS climate satellite mission passes key test - Space4Climate"
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214:. It is meant to "improve the accuracy, reliability and integrity" of
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Traceable
Radiometry Underpinning Terrestrial- and Helio-Studies
35:
Traceable
Radiometry Underpinning Terrestrial- and Helio-Studies
19:
This article is about a satellite mission. For other uses, see
806:
Fox, Nigel; Kaiser-Weiss, Andrea; et al. (2011-10-28).
908:"Space mission to reveal 'Truths' about climate change"
861:
Fehr, Thorsten; Fox, Nigel; et al. (2023-02-22).
672:
Sensors, Systems, and Next-Generation
Satellites VI
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734:Boesch, H; Brindley, H; et al. (2022-01-25).
218:(EO) data, and to be the first of a new class of "
934:"Europeans discuss TRUTHS climate change mission"
1134:World Meteorological Organisation OSCAR database
278:
1173:National Physical Laboratory (United Kingdom)
8:
26:
401:selected to provide the infrared detectors.
362:Onboard Calibration System (OBCS) animation
186:CSAR - cryogenic solar absolute radiometer
25:
870:
782:
383:Early 2000s – Mission proposed by the UK
250:is the primary standard used by national
738:(Report). National Physical Laboratory.
188:HIS - hyperspectral imaging spectrometer
1078:"COP28: UK climate satellite contracts"
938:Meteorological Technology International
453:
757:Fox, Nigel; Green, Paul (2020-07-27).
414:2023 – Further funding awarded during
330:
1054:"NPL TRUTHS mission receives funding"
705:Fox, Nigel; Green, Paul; et al.
7:
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421:~ 2030 – Estimated launch, aboard a
16:Planned Earth observation satellite
14:
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865:(Report). Copernicus Meetings.
1:
1119:Centre for EO instrumentation
1007:Jewett, Rachel (2021-11-05).
872:10.5194/egusphere-egu23-12399
397:selected as lead contractor,
284:through high-accuracy direct
271:The mission is led by the UK
1168:Earth observation satellites
1104:National Physical Laboratory
932:Norman, Helen (2020-02-03).
647:National Physical Laboratory
602:National Physical Laboratory
385:National Physical Laboratory
367:National Physical Laboratory
273:National Physical Laboratory
896:. Space4Climate. July 2023.
715:10.1109/igarss.2016.7729499
643:"SI traceability in-flight"
624:. Space4Climate. 2020-02-26
408:: Began early design phase.
48:Solar radiation measurement
1189:
887:"TRUTHS Mission Explainer"
345:TRUTHS mission explanation
286:hyperspectral measurements
18:
515:"Learn more about TRUTHS"
355:
338:
241:lunar spectral irradiance
192:
185:
176:
111:
107:
69:
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39:
290:Earth’s radiation budget
466:database.eohandbook.com
102:Centre Spatial Guyanais
832:10.1098/rsta.2011.0246
328:
309:
21:Truth (disambiguation)
1163:Atmospheric radiation
1114:European Space Agency
323:
208:European Space Agency
121:Reference system
1158:2030s in spaceflight
598:"Mission objectives"
486:"Mission objectives"
248:cryogenic radiometer
61:5-8+ years (planned)
824:2011RSPTA.369.4028F
818:(1953): 4028–4063.
775:2020RemS...12.2400F
684:2003SPIE.4881..395F
427:Guiana Space Centre
28:
784:10.3390/rs12152400
329:
116:Orbital parameters
964:. 28 October 2021
894:space4climate.com
744:10.47120/npl.9319
692:10.1117/12.462438
678:. SPIE: 395–406.
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303:against which to
301:reference dataset
295:"To establish a "
233:spectral radiance
216:Earth observation
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257:primary standard
237:solar irradiance
74:Start of mission
58:Mission duration
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1085:. Retrieved
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1035:. 2022-10-12
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989:. 2020-12-02
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914:. 2020-01-22
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399:Teledyne e2v
378:
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348:
311:
294:
282:benchmarking
279:
270:
245:
235:(0.3% k=2);
229:
203:
199:
197:
164:96.9 minutes
52:traceability
44:Mission type
574:"Nigel Fox"
316:Development
181:Instruments
150:Inclination
98:Launch site
79:Launch date
1152:Categories
1087:2023-12-05
1063:2023-12-03
1058:NPLWebsite
1039:2023-12-03
1018:2023-12-03
993:2023-12-03
968:2023-12-03
943:2023-12-03
918:2023-12-03
720:2023-12-03
652:2023-12-02
628:2023-12-02
607:2023-12-03
583:2024-01-12
578:NPLWebsite
559:2023-12-05
524:2023-12-05
519:NPLWebsite
495:2023-12-05
490:NPLWebsite
471:2023-12-05
449:References
404:2021 – At
379:Timeline:
261:radiometer
259:cryogenic
125:Geocentric
840:1364-503X
793:2072-4292
425:from the
395:Airbus UK
280:"Climate
266:metrology
252:metrology
243:(0.3%)".
212:satellite
202:mission (
93:(planned)
1124:EOportal
912:BBC News
848:21930564
622:"TRUTHS"
437:See also
141:Altitude
987:UKspace
820:Bibcode
771:Bibcode
680:Bibcode
443:CLARREO
393:2020 –
324:TRUTHS
226:Science
172:61 days
1082:GOV.UK
846:
838:
791:
423:Vega-C
370:(2019)
351:(2021)
210:(ESA)
204:TRUTHS
160:Period
144:610 km
131:Regime
91:Vega-C
87:Rocket
27:TRUTHS
890:(PDF)
416:COP28
406:COP26
387:(NPL)
135:Polar
82:~2030
32:Names
1138:CSAR
844:PMID
836:ISSN
789:ISSN
676:4881
246:The
198:The
1142:HIS
867:doi
828:doi
816:369
779:doi
740:doi
711:doi
688:doi
154:90°
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