On Tue, Mar 8, 2011 at 11:05 PM, Magnus Danielson <mag...@rubidium.dyndns.org> wrote:
I'm still wondering exactly which spacecraft this person is working on. His questions are not indicative of current leading edge research in this area. Sounds like he is starting from zero and maybe not up to speed on current best practice. Use of GPS in space is now, I think a mature technology and there are several space-qualified receivers. There are simple little things that may prevent you from using off the shelf commercial receivers (1) vacuum is a very good insulator, thermal design is different if you have air vs. vacuum (2) Power and weight. (3) materials, (4) EMI, ....(100) Not that it can't be done but there are 100 things you'd need to know and checkout and you need to buy a statistically valid number of these units and test them in simulated conditions. It's an expensive process that has risk to schedule and budget because you can't predict the outcome of the qualification process in advance. Hence the small industry of companies selling pre-qualified units. That said, If this is an amateur sat. project or a university funded project them it's worth it because you have nearly unlimited free labor for engineering and QA. -- ===== Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.