PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2010-11-11, CMA, Creation; 2013-01-04, BG, Corrections" RECORD_TYPE = STREAM OBJECT = INSTRUMENT INSTRUMENT_HOST_ID = RO INSTRUMENT_ID = NAVCAM OBJECT = INSTRUMENT_INFORMATION INSTRUMENT_NAME = "NAVIGATION CAMERA" INSTRUMENT_TYPE = "CCD CAMERA" INSTRUMENT_DESC = " ====================================================================== Instrument Overview: ====================================================================== The ROSETTA Navigation Camera (NavCam) is a part of the ROSETTA Attitude and Orbital Control System (AOCS). It comprises two identical cameras to provide for complete redundancy and Single Event Upset (SEU). The purpose of the NavCam system is to provide Imaging, Autonomous Acquisition and Tracking of Star-fields and Extended Sources, and Autonomous Navigation for the ROSETTA S/C. ====================================================================== Objectives of the NavCam: ====================================================================== - Autonomous Acquisition and Tracking of Point Targets - Autonomous Acquisition and Tracking of Extended Sources - Imaging of Star-fields and Extended Sources - Determine Coarse and Fine Attitude Corrections ====================================================================== The ROSETTA NavCam Instrument: ====================================================================== Two identical units each with: + Camera Optical Head (CAM-OH) - CCD with pixel angular size of 17 arcsec. - Proximity Electronics: + CCD drivers + CCD bias and phase voltage regulators + Analogue Signal Processor + two Multiplexers + 12-bit monolithic 1.25 Mobilisation Station and Planning System (MSPS) Analogue-Digital Converter (ADC). + Interfaces for temperature control and cover mechanism - Timing Sequencer and Control Logic + CCD sequencer and analogue channel control + Data interface - Digital Signals and Power Interface + Camera Electronics Unit (CAM-OH) - Digital Signal Processing (DSP) Board with NavCam processor and other related interfaces + the DSP itself + Memory Banks + DSP Peripherals + Interfacing between the Avionics Interface Unit (AIU), SSMM and the Optical head (OH) + Instrument control function + Camera Baffle (CAM-BAF) - mechanism to reduce reflected light reaching the sensor. ====================================================================== NavCam Classification: ====================================================================== + Navigation Camera (NavCam) + Low power consumption (16.8 W Total) + Compact unit + Qualified for space application ====================================================================== NavCam Characteristics: ====================================================================== +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Parameter | Value | Comment | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Mass (OH) | 6.05 kg | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Mass (EU) | 2.70 kg | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Mass (BAF) | 1.408 kg | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Total Mass | 10.158 kg | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Total Power | 16.8 W | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Field of View | 5deg x 5deg | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Sensor Type | CCD | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Number of Pixels | 1024 x 1024 | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Focal Length | 152.5 mm | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Pixel Size | 13 microm. | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Pixel Angular Size | 17 arcsec | | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Aperture | 70 mm | Non-Attenuated Modes | | | 30 mm | Attenuated Mode | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | F/Number | f/2.2 | Non-Attenuated Modes | | | f/5.1 | Attenuated Mode | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Limit Magnitude | Mv = 11 | Exp. Time 5 s, SNR >= 5 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Saturation Magnitude | Mv = 1.6 | Whole spectral range. | | | Mv = 0.8 | G2 Class.; exp. time = 10 ms | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Integration Time | 10 ms | Minimum | | | 30 s | Maximum | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Bias Error (1 sigma) | 0.2 pxls | Mv = 11, exp. time = 5 s, | | | | Defocused mode | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | NEA (1 sigma) | 0.1 pxls | Mv = 11, exp. time = 5 s, | | | | Defocused mode | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | Commanded Window Sz. | 20 x 20 | Minimum pixel array. | | | 1024 x 1024 | Maximum pixel array. | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | CCD Operative Temp. | -50 deg C | Minimum | | Range | +50 deg C | Maximum | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | CCD Performance | -25 deg C | Minimum | | Temperature Range | 0 deg C | Maximum | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ====================================================================== Major Operational Constraints: ====================================================================== + The NavCam must be in operation during all phases (except during Safe Mode). + The NavCam must have a minimum sun-avoidance angle of 65 degrees about boresight at a distance of 1 AU. + The NavCam must have a minimum sun-avoidance angle of 45 degrees about boresight at distances above 2 AU. + The NavCam in non-operational mode must have a minimum sun- avoidance angle of 20 degrees about boresight at distances of less than or equal to 1 AU. + The NavCam must be able to be switched off by the AOCMS S/W in the event of entering into Safe Mode. ====================================================================== History of the Instrument: ====================================================================== The NavCam for the Rosetta mission was designed and built by Galileo Avionica, building on a heritage of existing models, to satisfy the requirements of the Rosetta Autonomous Navigation Component. ====================================================================== NavCam Locations: ====================================================================== Optics: The NavCam optical heads are located on the +Z S/C axis with each protruding from the main body of the S/C. Electronics: The Electronic Units for the NavCams are located on the Avionics power box, common for all AOCMS components. ====================================================================== A/D Converter: ====================================================================== The A/D converted housed within the CAM-OH Proximity Electronics is a 12-bit, monolithic, 1.25 Mobilisation Stationing and Planning System (MSPS) architecture. ====================================================================== Operational Modes: ====================================================================== Each NavCam has seven different operational modes, however, only data acquired under the IMAGING MODE and ASTEROID TRACKING MODE will be present in the data. The MODE DESCRIPTION table below outlines the details of the IMAGING MODE. ====================================================================== Mode Description: ====================================================================== IMAGING MODE: ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | SUB MODE | FRAME RATE | WINDOW SIZE | INTEGRATION TIME | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | IDLE | 1 s | N/A | N/A | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | COVER POSITIONING | 0.8 s | N/A | N/A | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | IMAGE ACQUISITION | 35 s | 20 x 20 px | 10 ms | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | IMAGE ACQUISITION | 35 s | 1024 x 1024 px | 30 s | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The IDLE sub mode allows for the window size of the CCD to be set up before the IMAGE ACQUISITION mode begins operation. The sizes and times shown here for the IMAGING MODE are the lower and upper bounds. There are hundreds more possibilities for WINDOW SIZE, and hence read out time, under this sub mode. Generally the rule is that if a window size is one full row (1024 px) spanned over one pixel then the readout time will be 4.1 ms, thus the full window (1024 x 1024 px) will have a total readout time of 4.2 s (including transfer time of 1.3 ms for the image to be received to the Solid State Mass Memory (SSMM)). ====================================================================== Calibration: ====================================================================== This section is to be added once the calibration pipeline has been set up. " END_OBJECT = INSTRUMENT_INFORMATION OBJECT = INSTRUMENT_REFERENCE_INFO REFERENCE_KEY_ID = "N/A" END_OBJECT = INSTRUMENT_REFERENCE_INFO END_OBJECT = INSTRUMENT END