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  (Source: mckaylaisnotimpressed.tumblr.com)

Mike Ravine, Advanced Projects Manager for Malin Space Science Systems  (Source: torynfarr/flickr)

A two-image panorama shot with the rover's 1024 x 1024 mono navigation cameras  (Source: NASA)
Reasons included the amount of data produced, the fact that they had to meet the needs of different cameras, and the team's familiarity with these sensors

NASA recently accomplished a huge feat by landing its Mars rover Curiosity on the Red Planet, but one of the questions on the minds of many was why such a sophisticated machine used 2 MP cameras.
 
Mike Ravine, a project manager from Malin Space Science Systems, was happy to answer that in an interview with Digital Photography Review. He said the main reasons for using 2 MP sensors in the cameras were the amount of data produced, the fact that they had to meet the needs of different cameras, and the team's familiarity with these sensors.
 
"There's a popular belief that projects like this are going to be very advanced, but there are things that mitigate against that," said Ravine. "These designs were proposed in 2004, and you don't get to propose one specification then go off and develop something else. Two MP with 8 GB of flash didn't sound too bad in 2004. But it doesn't compare well to what you get in an iPhone today."
 
The amount of data produced is a large reason for using 2 MP cameras. There just isn't enough bandwidth for anything more powerful because the cameras must share with other instruments. Curiosity sends data back to Earth via the UHF transmitter, which transmits to two spacecraft orbiting Mars. The data is then sent back to Earth, and this system only allows for 250 megabits per day to be shared amongst various instruments.
 
The 2 MP camera sensors also were the tools of choice for the use of four different cameras, including the MAHLI, MARDI and two Mastcams. Having four different sensors for each camera would be expensive and more difficult to maintain rather than having one type of sensor all across the board. 
 
The team's familiarity with the sensors was crucial, too. The team knew the behavior of Truesense imaging chips and Kodak's KAI-2020 chip, so it makes sense that they'd work with what they know. 
 
"We know how to clock them and drive them," said Ravine. "They're a very easy CCD to drive."
 
Other issues, like the low pixel count, are not an issue either since the two Mastcams will create images from multiple exposures. 
 
NASA rover Curiosity landed successfully on Mars earlier this week after launching from Cape Canaveral, Florida on November 26, 2011. Curiosity is a one-ton, nuclear-powered, Mini Cooper-sized science laboratory that will explore the Martian surface for the next two years. 

Source: Digital Photography Review



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RE: Still no reason why they couldn't put 8MP
By estarkey7 on 8/9/2012 2:25:27 PM , Rating: 5
I've been working in New Product Development for the last twenty years.

If they constantly wanted to perform continuous improvements on every subsystem on Curiosity, guess where that rover would be today? Still in some lab at NASA because it would never get done.

At some point you have to shoot the engineer(s) and ship the product. When the product requirements were approved for this project, things that were necessary were included and things that weren't were cut out. Also, it's not like they had the luxury of adding a bunch of secondary and tertiary systems just in case they get a chance to use them - the damn thing already weighs a ton - which caused this elaborate landing sequence in the first place.


By JediJeb on 8/9/2012 3:38:17 PM , Rating: 2
quote:
If they constantly wanted to perform continuous improvements on every subsystem on Curiosity, guess where that rover would be today? Still in some lab at NASA because it would never get done.


Just like how people complained because Duke Nukem was continually pushed back. You set the specs in stone, then you complete the project. Back in 2004 a 4MP sensor was pretty much the top end that was in common use, and lower ones were the very well know ones. It is much better to have a 2MP camera that works well, than an 8MP camera that would glitch out the first time they took a picture.


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