urn:nasa:pds:context:instrument:vsk.phb2 1.0 1.7.0.0 Product_Context 2016-10-01 1.0 extracted metadata from PDS3 catalog and modified to comply with PDS4 Information Model urn:nasa:pds:context:instrument_host:spacecraft.phb2::1.0 instrument_to_instrument_host Avanesov, G.A., B.I.Bonev, F.Kempe, A.T.Bazilevsky, V.Boicheva, F.Kempe, A.T.Bazilevskii, T.Duxbury, 1989. Television Observations of Phobos, Nature, volume 341, p. 585-587. reference.AVANESOVETAL1989 VSK-FREGAT Imager not applicable not applicable Instrument Overview =================== VSK-FREGAT combines a threechannel television (TV) camera with two short-focal-length channels and one longer-focal-length channel. The camera has charge-coupled device (CCD) detectors with photosensitive and memory sections and uses an 'electronic shutter' technique. At the entrance of the cameras a mirror is placed. When closed it protects the telescopes and permits photometric calibration from internal radiation sources. Whenopened, it permits nadir viewing of Phobos, while in two intermediatepositions it allows panoramic viewing of Phobos, Mars and navigation targets. PDS1 Instrument Parameters ========================== INSTRUMENT_NAME = VSK-FREGAT INSTRUMENT_TYPE = CAMERA PI_PDS_USER_ID = G.AVANESOV NAIF_DATA_SET_ID = NAIF_VSK BUILD_DATE = 1988 INSTRUMENT_MASS = 36.15<KG> INSTRUMENT_HEIGHT = 790<MM> INSTRUMENT_LENGTH = 928<MM> INSTRUMENT_WIDTH = 517<MM> INSTRUMENT_MANUFACTURER_NAME = IKI (USSR & BULGARIA), ZKI (GDR) INSTRUMENT_SERIAL_NUMBER = LK4 Scientific Objectives Summary ============================= The scientific objectives of this experiment were the following: 1) MARS surveying - investigation of rock composition of the surface, cloudiness, dust amount in atmosphere; 2) NAVIGATION - updating of Phobos' and Deimos' orbits, their rotation periods, updating the data on Phobos shape, detailed imaging of the hovering region, spacecraft navigation; 3) PHOBOS investigations - surface structure studies, geological studies, topographic, morphometric and stereo mapping. Instrument Calibration Description ================================== On-ground radiometric and geometric calibration was performed. Radiometric calibration of the CCD array included calibration of the dark signal as a function of exposure time and temperature, the pixel responsivity as a function of exposure time and temperature, and the CCD array modulation transfer function. Geometric calibration consisted of: camera's telescope focusing, and establishing the CCD matrix homeplace position mounting and mirror positions' mounting. In flight calibration was performed, consisting of: internal radiometric calibration, using internal radiation sources, geometric and absolute radiometric calibration, using Canopus and Jupiter imaging. Operational Considerations ========================== VSK produced about 40 images of Phobos, which cover most of its surface except for that obscured by Mars, and a few images of Mars. The consecutive image productionmode was used for the instrument; imaging parameters and number of frames were defined by the session's program. The radiance was focused by the telescope on the CCD array. The analog read-out from CCD is transformed via an electronic block, which includes A-D conversion to digital data image frames, which are stored on MORION mass memory. The stored data were played back and transmitted to the Earth in special sessions. PDS1 Instrument Detector Parameters =================================== DETECTOR_ID = CCD1 DETECTOR_TYPE = CCD-ARRAY MINIMUM_WAVELENGTH = 0.45<MICROMETER> MAXIMUM_WAVELENGTH = 1.0<MICROMETER> NOMINAL_OPERATING_TEMPERATURE = 243<K> DETECTOR_DESC = Calimantan-Phobos type CCD array with size 520*580, consisting of a photosensitive section, memory sections and two output registers. The photosensitive section is opened for radiance and the memory section is closed. Each section contains 290 rows with 520 CCD elements. Pixel size is 18*24 micrometers. SENSITIVITY_DESC = The CCD matrix middle integral sensitivity is not less then 1 volt/lux. DETECTOR_ID = CCD2 DETECTOR_TYPE = CCD-ARRAY MINIMUM_WAVELENGTH = 0.45<MICROMETER> MAXIMUM_WAVELENGTH = 1.0<MICROMETER> NOMINAL_OPERATING_TEMPERATURE = 243<K> DETECTOR_DESC = See the DETECTOR_DESC for CCD1 SENSITIVITY_DESC = The CCD matrix middle integral sensitivity is not less then 1 volt/lux. DETECTOR_ID = CCD3 DETECTOR_TYPE = CCD-ARRAY MINIMUM_WAVELENGTH = 0.45<MICROMETER> MAXIMUM_WAVELENGTH = 1.0<MICROMETER> NOMINAL_OPERATING_TEMPERATURE = 243<K> DETECTOR_DESC = See the DETECTOR_DESC for CCD1 SENSITIVITY_DESC = The CCD matrix middle integral sensitivity is not less then 1 volt/lux. Instrument Electronics Description ================================== Electronic block provides thegain and processing for the CCD analog read-out and its transformation to a digital image frame. The digital image has 8 bits per pixel; all are significant. The electronic block also operates exposure time selection(available times: 1-32768 ms) and mirror position. After acquisition, the electronic block replaces first and last rows pixels and first 15 pixels of each row by housekeeping data in the image frame. PDS1 Filter Parameters ====================== FILTER_NUMBER = 1 FILTER_NAME = BLUE FILTER_TYPE = COLOR_GLASS MINIMUM_WAVELENGTH = 0.41<MICROMETER> CENTER_FILTER_WAVELENGTH = N/A MAXIMUM_WAVELENGTH = 0.59<MICROMETER> FILTER_NUMBER = 2 FILTER_NAME = CLEAR FILTER_TYPE = CLEAR_GLASS MINIMUM_WAVELENGTH = 0.41<MICROMETER> CENTER_FILTER_WAVELENGTH = N/A MAXIMUM_WAVELENGTH = 1.06<MICROMETER> FILTER_NUMBER = 3 FILTER_NAME = INFRARED FILTER_TYPE = COLOR_GLASS MINIMUM_WAVELENGTH = 0.76<MICROMETER> CENTER_FILTER_WAVELENGTH = N/A MAXIMUM_WAVELENGTH = 1.10<MICROMETER> PDS Instrument Optics Parameters ================================ TELESCOPE_ID = CAM1 TELESCOPE_FOCAL_LENGTH = 18.5<MM> TELESCOPE_DIAMETER = 7.4<MM> TELESCOPE_F_NUMBER = 2.5 TELESCOPE_RESOLUTION = 595<ONE/MM> OPTICS_DESC = The telescope contains the 7-lens objective, the protecting blenda and the filter. TELESCOPE_ID = CAM2 TELESCOPE_FOCAL_LENGTH = 100.0<MM> TELESCOPE_DIAMETER = 20.0<MM> TELESCOPE_F_NUMBER = 5.0 TELESCOPE_RESOLUTION = 295<ONE/MM> OPTICS_DESC = The telescope contains the 7-lenses objective, the protecting blenda and the filter. TELESCOPE_ID = CAM3 TELESCOPE_FOCAL_LENGTH = 18.5<MM> TELESCOPE_DIAMETER = 7.4<MM> TELESCOPE_F_NUMBER = 2.5 TELESCOPE_RESOLUTION = 558<ONE/MM> OPTICS_DESC = The telescope contains the 7-lenses objective, the protecting blenda and the filter. Instrument Mounting Description =============================== The TV block, consisting of 3 telescopes with mirrors and 3 detectors, is mounted on the spacecraft holder without hermoprotection. The electronic block is mounted inside the spacecraft. PDS1 Instrument Section Parameters ================================== SECTION_ID = CAMERA 1 SCAN_MODE_ID = 2 Mb/s DATA_RATE = 8192<B/S> SAMPLE_BITS = 8 FOV_SHAPE_NAME = RECTANGULAR FOVS = 1 HORIZONTAL_FOV = 27.6<DEGREE> VERTICAL_FOV = 21.2<DEGREE> HORIZONTAL_PIXEL_FOV = 3.3<ARCMIN> VERTICAL_PIXEL_FOV = 4.5<ARCMIN> INSTRUMENT_PARAMETER_NAME = RADIANCE MINIMUM_INSTRUMENT_PARAMETER = 1.0e-09 MAXIMUM_INSTRUMENT_PARAMETER = 1.0e-02 NOISE_LEVEL = 0.05<PERCENT> INSTRUMENT_PARAMETER_UNIT = WATT/(CM*CM*STERADIAN*MICRON) SAMPLING_PARAMETER_NAME = PIXEL MINIMUM_SAMPLING_PARAMETER = 0 MAXIMUM_SAMPLING_PARAMETER = 255 SAMPLING_PARAMETER_INTERVAL = 1 SECTION_ID = CAMERA 2 SCAN_MODE_ID = 2 Mb/s DATA_RATE = 8192<B/S> SAMPLE_BITS = 8 FOV_SHAPE_NAME = RECTANGULAR FOVS = 1 HORIZONTAL_FOV = 5.2<DEGREE> VERTICAL_FOV = 4.0<DEGREE> HORIZONTAL_PIXEL_FOV = 0.62<ARCMIN> VERTICAL_PIXEL_FOV = 0.83<ARCMIN> INSTRUMENT_PARAMETER_NAME = RADIANCE MINIMUM_INSTRUMENT_PARAMETER = 1.0e-09 MAXIMUM_INSTRUMENT_PARAMETER = 1.0e-02 NOISE_LEVEL = 0.05<PERCENT> INSTRUMENT_PARAMETER_UNIT = WATT/(CM*CM*STERADIAN*MICRON) SAMPLING_PARAMETER_NAME = PIXEL MINIMUM_SAMPLING_PARAMETER = 0 MAXIMUM_SAMPLING_PARAMETER = 255 SAMPLING_PARAMETER_INTERVAL = 1 SECTION_ID = CAMERA3 SCAN_MODE_ID = 2 Mb/s DATA_RATE = 8192<B/S> SAMPLE_BITS = 8 FOV_SHAPE_NAME = RECTANGULAR FOVS = 1 HORIZONTAL_FOV = 27.6<DEGREE> VERTICAL_FOV = 21.2<DEGREE> HORIZONTAL_PIXEL_FOV = 3.3<ARCMIN> VERTICAL_PIXEL_FOV = 4.5<ARCMIN> INSTRUMENT_PARAMETER_NAME = RADIANCE MINIMUM_INSTRUMENT_PARAMETER = 1.0e-09 MAXIMUM_INSTRUMENT_PARAMETER = 1.0e-02 NOISE_LEVEL = 0.05<PERCENT> INSTRUMENT_PARAMETER_UNIT = WATT/(CM*CM*STERADIAN*MICRON) SAMPLING_PARAMETER_NAME = PIXEL MINIMUM_SAMPLING_PARAMETER = 0 MAXIMUM_SAMPLING_PARAMETER = 255 SAMPLING_PARAMETER_INTERVAL = 1 Instrument Mode Description =========================== The consecutive image production mode was used for the instrument; imaging parameters and number of frames were defined by the session's program.