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• W2001273441 abstract "ABSTRACT A dilation push-broom imaging CCD sensor is being considered for certification of landing and roving sites for the Mars Rover/Sample Return Mission. It would be used to certify several candidate sites of 10 km by 10 km. Rocks and holes of size 1 m and larger will be identified using an optical sensor with 0.25 m resolution. This requires a large aperture camera and a camera pointing control system designed for high accuracy and stability. The imaging time is stretched out by a factor of 8 over the time required to fly directly over the imaged site to reduce the data rate and to increase the exposure time. Six parallel data strings are used to reduce the data rate through each string to a manageable 25 Mbps. 1. Introduction Launch of the Mars Rover Sample Return Mission (MRSR) Imaging Orbiter is planned for 1996 or 1998. The imaging orbiter will map several scientifically interesting areas and certify them if safe for a lander containing a roving vehicle or a sample return vehicle. The Rover will leave its lander and explore and sample the surface of Mars. When the rover has finished collecting samples, they will be returned to Earth.Scientists are interested in obtaining samples from the surface of Mars and bringing them back to Earth for analysis.1 3 In contrast with the Viking missions, where only two sites were studied,4^ the MRSR mission is designed to study different geologically relevant areas on the martian surface. The rover will have two cameras for viewing the scene in stereo; it will see the obstructions and intelligently chart its own way around them. It will also have the capability to collect the samples of scientific interest and store them for return to Earth for later analysis. The scales of the rover and the lander are such that both are concerned with 1 m obstacles.Prior to rover landing, several geologically interesting sites will be surveyed with a very large aperture camera (VLAC) to determine the sites which are indeed safe for landing. Additionally, the site survey will provide information on traversable, obstruction-free paths for the rover to follow during its exploration phase.2. Mapping2.1 Orbital ConfigurationIn the concept under study, the surface of Mars is mapped from a spacecraft in an elliptical orbit prior to the landing of the Mars Rover.6 Orbital parameters were selected to facilitate the mapping process. The orbital period is equal to one third of the solar day on Mars - the Sun illumination angle at the mapping site is nearly constant. The orbit is shown in Figure 1. (Tic marks show time intervals of 5 minutes.) Mapping is performed near periapsis, when the spacecraft is closest to the surface.2.2 Mapping RequirementsThe landing site is an area of 10 x 10 km which is certified for safe landing and which is traversable by the semi-autonomous rover. The orbiter will map a minimum of five areas in succession. The operations team will select from these areas the site which best meets the safety and scientific requirements." @default.
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• W2001273441 date "1989-07-25" @default.
• W2001273441 modified "2023-09-26" @default.
• W2001273441 title "CCD-Based Site Certification Imaging System For Mars Sample Return Mission" @default.
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• W2001273441 doi "https://doi.org/10.1117/12.952495" @default.
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