TEMPEST-D (Temporal Experiment for Storms and Tropical Systems Technology - Demonstration)
TEMPEST-D is a CubeSat project of CSU (Colorado State University) Fort Collins, CO, with the objective to demonstrate the ability to monitor the atmosphere with small satellites. The team will demonstrate a radiometer aboard a 6U CubeSat (30 cm x 20 cm x 10 cm) and subsequently plan to deploy a constellation of satellites to study cloud processes. The team, led by Steven Reising (PI), professor of electrical and computer engineering, is developing instrumentation for CubeSats that can observe, in real time, a storm as it grows and progresses. 1)
TEMPEST-D will reduce the risk, cost and development time of a future constellation of 6U-Class nanosatellites to directly observe the time evolution of clouds and study the conditions that control the transition from non-precipitating to precipitating clouds using high-temporal resolution observations. TEMPEST-D provides passive millimeter-wave observations using a compact radiometer (90-183 GHz) that fits well within the size, weight and power (SWaP) requirements of the 6U-Class satellite architecture. TEMPEST-D is suitable for launch through NASA's CSLI (CubeSat Launch Initiative), for which it was selected in February 2015. 2) 3)
By measuring the temporal evolution of clouds from the moment of the onset of precipitation, a TEMPEST constellation mission would improve our understanding of cloud processes and help to constrain one of the largest sources of uncertainty in climate models. Knowledge of clouds, cloud processes and precipitation is essential to our understanding of climate change. Uncertainties in the representation of key processes that govern the formation and dissipation of clouds and, in turn, control the global water and energy budgets lead to substantially different predictions of future climate in current models.
The goal of the TEMPEST-D is a mission to validate the performance of a CubeSat microwave radiometer designed to study precipitation events on a global scale. The TEMPEST constellation of 6U CubeSats is designed to sample convective precipitation events, from cloud formation, through ice formation and precipitation to cloud dissipation. 4)
The TEMPEST-D project is to increase the TRL (Technology Readiness Level) of the millimeterwave radiometer instrument from 6 to 9. 5)
The TEMPEST-D mission success criteria for a 90-day mission after on-orbit commissioning are as follows:
1) To demonstrate feasibility of differential drag measurements required to achieve the desired time separation of 6U-Class satellites deployed together in the same orbital plane.
2) To demonstrate cross-calibration with 2 K precision and 4 K accuracy between TEMPEST-D millimeter-wave radiometers and the NASA/JAXA GPM/GMI or the Microwave Humidity Sounder currently in orbit on two NOAA satellites and two ESA/EUMETSAT satellites.
TEMPEST-D 1 is a partnership among CSU, JPL and spacecraft provider BCT (Blue Canyon Technologies Inc.) of Boulder, CO. BCT has recently been awarded a contract to build, test, and operate a new 6U-class satellite. BCT will deliver the 6U spacecraft, ready for instrumentation, for the TEMPEST-D project, led by CSU (Colorado State University), Fort Collins, CO. TEMPEST-D is supported by NASA's Science Mission Directorate, Earth Science Division and is managed by NASA's ESTO (Earth Science Technology Office). NASA/JPL(Jet Propulsion Laboratory) will provide the five-channel millimeter-wave radiometer instrument. 6)
BCT will integrate the TEMPEST-D payload with the 6U spacecraft bus and perform environmental testing of the complete spacecraft. The spacecraft will be operated from BCT's Mission Operations Center in Boulder, Colorado. BCT's 6U spacecraft is a high-performance CubeSat that includes an ultra-precise attitude control system that allows for accurate knowledge and fine-pointing of the satellite payload.
Figure 1: Artist's rendition of the deployed TEMPEST-D nanosatellite (image credit: BCT, CSU)
ADCS (Attitude Determination and Control Subsystem): BCT uses the XACT-50 (fleXible ADCS Cubesat Technology-50) for 6U CubeSats. The XACT-50 improves the capability of XACT by incorporating larger reaction wheels and torque rods.
Table 1: Parameters of XACT-50
Figure 2: Illustration of the XACT-50 device (image credit: BCT)
The complete TEMPEST-D flight system will be delivered to NanoRacks for launch integration in the autumn of 2017, spacecraft mass: 6 kg).
Figure 3: The TEMPEST-D satellite at Blue Canyon Technologies in Boulder, CO (image credit: Blue Canyon Technologies) 7)
Launch: The TEMPEST-D CubeSat was launched to the ISS on 21 May 2018 (08:44 UTC) on ELaNa 23 of NASA. The launch vehicle was the Antares 230 with Cygnus CRS OA-9E, also known as Orbital Sciences CRS Flight 9E, the tenth planned flight of the Orbital ATK unmanned resupply spacecraft Cygnus. The launch site was MARS (Mid-Atlantic Regional Spaceport), Wallops Island, VA, USA. 8) 9)
Orbit: Near circular orbit, altitude of ~400 km, inclination = 51.6º.
The ELaNa 23 (Education Launch of Nanosatellites 23) initiative payloads of NASA on OA-9 are: 10)
• HaloSat (Soft X-ray Surveyor), a 6U CubeSat of the University of Iowa, Iowa City, Iowa.
• TEMPEST-D 1 (Temporal Experiment for Storms and Tropical Systems Technology - Demonstration 1) , a 6U CubeSat of CSU (Colorado State University), Fort Collins, CO.
• EQUiSat – a 1U CubeSat of Brown University, Providence, R.I.
• MemSat, a 1U CubeSat of Rowan University, Glassboro, N.J.
• CaNOP (Canopy Near-IR Observing Project), a 3U CubeSat of Carthage College, Kenosha, WIS, USA.
• RadSat (Radiation-tolerant SmallSat Computer System), a 3U CubeSat of MSU (Montana State University), Bozeman, Montana.
• RaInCube (Radar In a CubeSat), a 6U CubeSat of NASA/JPL (Jet Propulsion Laboratory), Pasadena, CA.
• SORTIE (Scintillation Observations and Response of the Ionosphere to Electrodynamics), a 6U CubeSat of ASTRA (Atmospheric & Space Technology Research Associates), Boulder, CO.
• CubeRTT (CubeSat Radiometer Radio Frequency Interference Technology) Validation Mission , a 6U CubeSat of OSU (Ohio State University), Columbus, Ohio.
• AeroCube-12A and -12B, a pair of 3U CubeSats of the Aerospace Corporation, El Segundo , CA, to demonstrate a the technological capability of new star-tracker imaging, a variety of nanotechnology payloads, advanced solar cells, and an electric propulsion system on on one of the two satellites (AC12-B).
• EnduroSat One, a 1U CubeSat of Bulgaria, developed by Space Challenges program and EnduroSat collaborating with the Bulgarian Federation of Radio Amateurs (BFRA) for the first Bulgarian Amateur Radio CubeSat mission.
• Lemur-2, four 3U CubeSats (4.6 kg each) of Spire Global Inc., San Francisco,CA.
• September 20, 2018: TEMPEST-D took its first images of Hurricane Florence on 11 September, just hours after its instrument was turned on. The 6U CubeSat carries a state-of-the-art miniaturized microwave radiometer, an instrument that sees through the thick clouds to reveal the hidden interior of storms. 11)
Figure 4: This animation combines the TEMPEST-D data with a visual image of the storm from NOAA's GOES (Geoweather Operational Environmental Satellite) weather satellite. The brightly colored image taken by the small, experimental satellite TEMPEST-D captures Hurricane Florence over the Atlantic Ocean. The colors reveal the eye of the storm, surrounded by heavy rain. The green areas highlight the extent of the rain being produced by the storm, with the most intense rain shown in the yellow and red areas. The TEMPEST-D data is contrasted with a visible image of Florence taken by the GOES weather satellite, which shows the familiar cyclone-shaped clouds of the storm, but doesn't reveal what's inside (image credit: NASA/NOAA/Naval Research Laboratory Monterey/JPL-Caltech)
- The image taken by TEMPEST-D captures Florence over the Atlantic Ocean, revealing the eye of the storm surrounded by towering, intense rain bands. The green areas highlight the extent of the rain being produced by the storm, with the most intense rain shown in yellow and red. The TEMPEST-D data is contrasted with a visible image of Florence that shows the familiar cyclone-shaped clouds of the storm but doesn't reveal what's inside.
- TEMPEST-D's mission is to test new, low-cost technology that could be used in the future to gather more weather data and help researchers better understand storms. The level of detail in the small-satellite image is similar to what existing weather satellites produce.
- "We were challenged to fit this instrument into such a small satellite without compromising data quality and were delighted to see it work right out of the box," said Sharmila Padmanabhan, who led the instrument development at NASA's Jet Propulsion Laboratory in Pasadena, California.
- Shrinking weather satellites could one day help scientists provide more frequent updates on developing storms. "TEMPEST-D paves the way for future missions where we can afford to fly many of these miniaturized weather satellites in constellations. Such a deployment would enable us to watch storms as they grow," said Steven Reising, the principal investigator for TEMPEST-D at Colorado State University.
- TEMPEST-D is a technology-demonstration mission led by Colorado State University and managed by NASA/JPL, in partnership with Blue Canyon Technologies and Wallops Flight Facility, Virginia. The mission is sponsored by NASA's Earth Ventures program and managed by the Earth Science Technology Office. The radiometer instrument was built by JPL and employs high-frequency microwave amplifier technology developed by Northrop Grumman Corporation.
• July 13, 2018: NanoRacks successfully completed the 14th CubeSat Deployment mission from the Company's commercially developed platform on the International Space Station. Having released nine CubeSats into low-Earth orbit, this mission marks NanoRacks' 185th CubeSat released from the Space Station, and 217th small satellite deployed by NanoRacks overall. 12)
- The CubeSats deployed were launched to the Space Station on the ninth contracted resupply mission for Orbital ATK (now Northrop Grumman Innovation Systems) from Wallops Island, Virginia in May 2018.
- NanoRacks offered an affordable launch opportunity, payload manifesting, full safety reviews with NASA, and managed on-orbit operations in order to provide an end-to-end solution that met all customer needs.
- The satellites deployed were: CubeRRT, EQUiSat, HaloSat, MemSat, RadSat-g, RainCube, TEMPEST-D, EnduroSat One, Radix (the last two entries are commercial CubeSats).
- The CubeSats mounted externally to the Cygnus spacecraft from the May 2018 launch are scheduled to be deployed on Sunday, July 15th, pending nominal operations.
Sensor complement: (MM Radiometer)
MM Radiometer (Millimeter-wave Radiometer)
The MM radiometer is being built by NASA/JPL and performs continuous measurements at five frequencies, 89, 165, 176, 180 and 182 GHz. The five-frequency radiometer is based on the direct-detection architecture, in which the RF input to the feed horn is amplified, bandlimited, and detected using Schottky diode detectors. 13) The use of direct-detection receivers based on InP HEMT MMIC LNA front ends substantially reduces the mass, volume and power requirements of these radiometers. 14) Input signals are bandlimited using waveguide-based bandpass filters to meet the radiometer bandwidth requirements of 4±1 GHz at center frequencies of 89 and 165 GHz, as well as 2±0.5 GHz at 176, 180 and 182 GHz center frequencies (Ref. 5).
The TEMPEST-D instrument design is based on a 165 GHz to 182 GHz radiometer design inherited from RACE and an 89 GHz receiver developed under the ESTO ACT-08 and IIP-10 programs at CSU (Colorado State University) and JPL. All receivers were jointly developed by JPL and the Northrop Grumman Corporation. The TEMPEST reflector scanning and calibration methodology has been adapted from the ATMS (Advanced Technology Microwave Sounder). This methodology has been validated on the Global Hawk unmanned aerial vehicle (UAV) using the HAMSR (High Altitude MMIC Sounding Radiometer) instrument. 15)
The TEMPEST-D instrument occupies a volume of 3U (normally defined as 34 cm x 10 cm x 10 cm) and is designed for deployment in a 6U CubeSat. The instrument is mounted on a temperature controlled bench that interfaces with the spacecraft structure using thermally isolating spacers. Figure 6 shows the mechanical layout of the instrument components on the instrument bench.
Figure 5: Instrument block diagram and photos of components (image credit: TEMPEST-D collaboration)
Figure 6: Instrument mechanical layout (image credit: TEMPEST-D collaboration)
The TEMPEST-D radiometer performs cross-track scanning, measuring the Earth scene between ±45° nadir angles, providing an 825 km wide swath from a 400 km nominal orbit altitude. Each radiometer pixel is sampled for 5 ms. The radiometer performs end-to-end calibration during each rotation of the scanning reflector. The radiometer observes both cosmic background radiation at 2.7 K and an ambient blackbody calibration target (at approximately 300 K) every 2 seconds, for a scan rate of 30 RPM. A schematic representation of the TEMPEST-D observing profile over a 360° reflector scan and the resulting output data time series are shown in Figure 7.
Figure 7: Schematic representation of TEMPEST-D observing profile (left) and output data time series (right) for each reflector scan (image credit: TEMPEST-D collaboration)
The TEMPEST-D flight model radiometer instruments (two copies, FM1 and FM2) have been designed, fabricated and integrated at JPL. Figure 8 shows the TEMPEST-D instrument, including scanning reflector (top left), dual-frequency feed horn, originally developed under a NASA ESTO Advanced Component Technology (ACT-08) program (center left), and the four radiometer channels from 165 to 182 GHz, including front-ends, power divider, bandpass filter bank and detectors. Measurements of the receiver bandpass and linearity of each of the five frequency channels have been performed at JPL.
Figure 8: TEMPEST-D flight model radiometer instrument ready for delivery at JPL (image credit: NASA/JPL)
Both TEMPEST-D flight model instruments have been integrated with the XB1 6U spacecraft avionics and bus at BCT, as shown in Figure 9. The TEMPEST-D flight model radiometer and spacecraft bus have passed electromagnetic self-compatibility tests in an anechoic chamber designed for EMI (Electromagnetic Interference)testing.
Figure 9: TEMPEST-D flight model radiometer instrument and XB1 spacecraft bus for selfcompatibility testing at BCT (image credit: TEMPEST-D collaboration)
The TEMPEST-D flight model radiometer instrument has passed vibration testing to GEVS (General Environmental Verification Standard ) levels at JPL. Figure 10 shows the TEMPEST-D flight model instrument in the configuration for vibration testing. The receiver characteristics have been measured and compared for both pre- and post-vibration testing. The next steps for the flight model radiometer instrument are TVAC (Thermal Vacuum) testing and antenna radiation pattern testing at JPL.
Figure 10: TEMPEST-D flight model radiometer instrument in vibration testing configuration at JPL (image credit: NASA/JPL)
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The information compiled and edited in this article was provided by Herbert J. Kramer from his documentation of: "Observation of the Earth and Its Environment: Survey of Missions and Sensors" (Springer Verlag) as well as many other sources after the publication of the 4th edition in 2002. - Comments and corrections to this article are always welcome for further updates (firstname.lastname@example.org).