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The Virtex FPGA was chosen simply because our Chief Engineer had experience with working with Virtex systems, and they agreed to give us the development kit for less. Could have used any, I personally was rooting for the Cyclone class FPGAs by Altera because that's what I've worked with. I had to learn VHDL, but that was easily done since I already had a lot of experience with Verilog.Now you got me interested
Any reason for using the Virtex? from your description on the resume i am guessing the tasks could be accomplished using an ARM core as well..
Was there a governing processor on top of the FPGA?.. I am assuming that the Laser Control Unit wasn't a standalone component for the turret?
The Virtex FPGA was chosen simply because our Chief Engineer had experience with working with Virtex systems, and they agreed to give us the development kit for less. Could have used any, I personally was rooting for the Cyclone class FPGAs by Altera because that's what I've worked with. I had to learn VHDL, but that was easily done since I already had a lot of experience with Verilog.
The purpose of choosing an FPGA over an ARM core or a microcontroller was simple - speed. We wanted our system to be able to accomplish task much quicker, hence we went for a hardware solution rather than a software solution (which would be the case in microcontrollers as you need to program them usually in C or Assembly). FPGA is used both for the high-level governing (designed in-house by L-3 WESCAM) and the Laser Control (designed by my company).
See, when it comes to a system like this, the Mechanical parts govern how fast your electronics need to be, because they are by far the slowest part of the system. Generally speaking, mechanical systems are slow enough that a software-based solution is fine. However, in this particular system, the gimbal can move at considerable speeds and can lock onto a geographic point, hence we went for something that would give us quicker processing.
I don't remember the gimbal rate anymore, but it was fast enough. There were calculations required to determine the position of the lasers, and we had to finish all those calculations before each gimbal signal was received. If that hadn't been the case, a microprocessor would have been more than fast enough.The last paragraph summed it up best..
Whats the gimbal rate then??
Considering the imagery feed is not interrupted while it tracks..
There was a TVC module for a propulsion system I worked on .. using inputs from a six axis system...the mechanics forced us to move up from a MC, to a spartan..but finally a TI system was chosen...(I am a Ti buff.. same reason.. experience..know the software environment..and architecture)... Power consumption was surprisingly better with the TI chip..even though the Spartan was rated lower...
The TI was taking less time to do more.
Beech 200 Super King Air, 927, Pakistan Army
Beech 200 Super King Air, 927, Pakistan Army
I don't remember the gimbal rate anymore, but it was fast enough. There were calculations required to determine the position of the lasers, and we had to finish all those calculations before each gimbal signal was received. If that hadn't been the case, a microprocessor would have been more than fast enough.
Did you use a Texas Instrument FPGA? I didn't know they made any FPGAs. Or did you move over to a DSP chip? TI's really got the benchmark stuff for DSP, very tough to beat their performance. They were at my university a couple of days ago recruiting, and my friend won a free development kit for one of their leading platforms. I've been trying to get him to let me use it for fun, but I think he would rather sell it online. Too bad, I could've really made good use of it. I'm entering this international robotics competition known as the Intelligent Ground Vehicle Competition next year representing my university, and we're a bit cash strapped.
By the way, if you feel like reading more about my techy activities, go here and read-up on the robotics team I've founded: Autonomous Robotic Systems - University of Toronto. Generally I wouldn't have bothered giving out that website, but I think you would be interested.
Re: BEECH 350'S AT PIK
by honest man » Sun May 01, 2011 6:17 pm
Noticed on FAA site these King airs are cancelled off register to Pakistan
BEECH 350'S AT PIK • FighterControl • Military Aviation Forum