Sun pointing to 100 arcsec accuracy is expected. Figure 8: Portion of the Maldive Islands as seen by CHRIS on PROBA, observed on July 05, 2005 (image credit: ESA). Both the DSP and MMU are part of PPU (Payload Processing Unit). The Energetic Particle Telescope is an advanced radiation detector that will measure the energy, angle and mass of energetic particles in the satellite’s vicinity. 17). PROBA-3 is the third small satellite technology development and demonstration precursor mission within ESA's GSTP (General Support Technology Program) series. The satellite’s control system consists of a star tracker, GPS receivers, a magnetometer and magneto-torquers. b) Detection and counting of cosmic ray events, Other band sets are utilized for calibration purposes. The calculations of the relevant slew characteristics are based on a request file (containing the coordinates of the target area and the observation duration) which is uplinked from ground. The satellite was funded through the ESA's MicroSat program. The spacecraft is then free tumbling. Further planned satellites in the PROBA series include the formation flying demonstration mission PROBA-3 and limb sounder ALTIUS. The main goal of leaving PROBA-1 to operate itself with minimum ground control was long ago achieved. This is much more stable and the regular short term variations are due to orbital effects. - The only noticeable ageing effect experienced by the satellite comes from a combination of cumulative radiation damage and higher seasonal temperatures (counter-intuitively for us in the Northern hemisphere, Earth comes closest to the Sun in January, leading to an effective 10% increase in solar flux). Proba-3 facts and figures Launch date: Mid 2022: Mass: Coronagraph spacecraft 340 kg; Occulter spacecraft 200 kg: Orbit: High Earth orbit, 19.7 hours orbital period, 60 530 km apogee, 600 km perigee: Instrument: External coronagraph: Ground station: Redu, Belgium The ERC32 computer is able to support a number of on-board processing functions including science data processing (image compression). The dispersion of the spectrometer varies from about 1.25 nm to 11 nm across the spectral range, with the highest dispersion at 400 nm and the lowest at the high end (1050 nm) of the spectral range. - Aperture diameter PROBA was designed/developed by a consortium led by Verhaert Design and Development N. V. of Kruibeke, Belgium and sponsored by OSTC (Federal Office for Scientific, Technical, and Cultural Affairs) of Belgium.
Figure 20: Illustration of the ASC with 2 CHU and a DPU (image credit: ESA). Launch: The PROBA spacecraft was launched on Oct. 22, 2001 on the PSLV-C3 launcher of ISRO (secondary payload to TES (Technology Experiment Satellite) of ISRO and BIRD of DLR) from SHAR (ISRO Sriharikota Range, the ISRO launch site on the East Coast of India). The instrument has a mass of about 2.4 kg, power consumption of 9 W, and standard RS 422 / IEEE 1355 interfaces. - Advanced development methods (such as code generation) are sufficiently mature and are cost efficient. The solar generators provide a maximum of 110 watts of electrical power at the end of the nominal two-year mission. 48-53, URL: http://www.esa.int/esapub/bulletin/bulletin129/bul129f_teston.pdf, 27) In-orbit demonstration - Testing new technology in Earth orbit,” ESA, June 22, 2009, URL: http://www.esa.int/SPECIALS/Technology/SEMCPNBDNRF_0.html, 28) F. Teston, D. Bernaerts, K. Gantois, “PROBA, an ESA technology demonstration mission, results after 3 years in orbit,” Proceedings of the 4S Symposium: Small Satellites, Systems and Services,” Sept. 20-24, 2004, La Rochelle, France, ESA SP-571, 29) M. A. Cutter, D. R. Lobb, T. L. Williams, R. E. Renton, “Integration & Testing of the Compact High-Resolution Imaging Spectrometer (CHRIS),” Proceedings of SPIE, Vol. The monitor’s main purpose is to identify radiation hazards to its host mission but it is also building a detailed picture of the space radiation environment. The Proba-2 mission is being controlled from a dedicated ground station at ESA Redu, in Belgium. The PPU provides also several additional interfaces for other on-board experiments, interfaces to solid state gyroscopes (SSG), an interface to an extra star tracker (PASS), and an interface to a house-keeping bus. 19 band readout at 17 m GSD, above the Earth's surface, has provided scientists with its first detailed PROBA is powered by an ABSL Li-ion battery which is the longest serving in the industry. Autonomous navigation is enabled with GPS position determination and orbit propagation. The attitude control and avionics subsystems accommodate the core technologies for S/C autonomy. Thus, SREM provides data on the space weather conditions in the vicinity of the spacecraft. 24). Figure 10: Schematic of instrument optical design (image credit: Sira), The CHRIS commands are transferred from the platform telemetry system to CHRIS via a TEMIC DSP (Data Signal Processor), a radiation tolerant and space-qualified TSC 21020 device (TSC 21020 is commercially available since the end of 1998). A technology demonstration satellite turned Earth observation mission, the satellite’s platform and payload effectively work as one. All demonstration payloads will be tested in the space environment to gain insight into their functionality and possible application for future missions. The observation of the square target area consists in 5 consecutive pushbroom scans by the single-line array detectors, each scan is executed at different view angles to the target within a 55º cone centered at the target zenith. • 2004: As a result of the success of the technology and the continuing excellent performance of the satellite and its payloads, PROBA-1 became an ESA Earth observation ‘Third Party Mission’ in 2004 (Ref.26) .
ASC is an autonomous star tracker, the main attitude sensor of PROBA, with the objective to provide full-sky coverage and to achieve a high pointing accuracy (precision of a few arcseconds) for Earth observation. - Downlink communications: Cold redundant S-band transmitters, 1 Mbit/s - Width, slit to detector, Unity The detector is a thinned, back-illuminated, frame-transfer CCD (1152 rows and 780 columns) - the rows are assigned to separate wavelengths, while the CCD columns are used to separate resolved points in the image. On 9 March 2018, it surpassed ERS-2 as ESA's longest operated Earth observation mission of all time.. The S/C uses a 1 Gbit mass memory for data recording and a tuneable 2 Kbit/s to 1 Mbit/s downlink. 19). • On Oct. 22, 2006, the PROBA spacecraft reached the milestone of 5 years of successful operations in orbit. CHRIS, weighing just 14 kg, can capture images that will allow scientists to develop For PROBA-1 — and the other PROBA missions that have followed — the approach that has been taken by QinetiQ Space and ESA was to develop small satellites at affordable costs where reliability is an important parameter. The FMC factor is 5. An area-array CCD detector at the focal plane provides pushbroom imagery. With an initial lifetime of 1 to 2 years, the satellite celebrated its 16th year of operations in 2017. The lower panel of Figure 7 shows the inner radiation belt encountered by PROBA-1 in the SAA (South Atlantic Anomaly). 6), Figure 1: Artist's impression of the PROBA satellite (image credit: Verhaert Space, ESA). The outer panels that do not carry solar cells are also fabricated from aluminium honeycomb and are variously painted black to radiate to cold space or white to minimise absorption of solar radiation, as appropriate. • In “safe mode” all ACNS HW units are switched off and the ACNS SW is not computing. 7). Mission operations are located at the ESA Redu (Belgium) ground station. Two-year extensions confirmed for ESA's science missions. Operational plans call for a total of 30 test sites: 15 for aerosol/atmosphere studies, 10 for land surface studies and 5 for coastal studies. Furthermore, the pushbroom velocity at the target must be reduced by a factor of 5 compared to nominal nadir-pointing velocity in order to increase optimal exposure time.
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