Friday, October 13, 2006

Argie Rumann – Developing Telemetry Systems with Reconfigurable I/O

Argie Rumann works at Swales Aerospace and is currently focused on projects at NASA Goddard related to the Hubble Space Telescope. I spoke to him on the phone the other day. He is coding a new ground station application for telemetry and commanding of a Space Shuttle payload associated with the Hubble telescope for an upcoming flight. He specified a single PXI-7833 with an 8196 controller in a 4-slot chassis for this NASA Goddard job. The system has 6 different sync and async 422 signals that will connect to user interfaces at the NASA MCC (mission control center) in Houston, so they are using the twisted DIO pairs on the RIOs to do the 422 signals and receive modulated IRIG-B through an analog input. Also working with Argie is Kareny Dominguez who is developing and integrating the windows level user interface with the RIO. She is compiling in LabVIEW 8.2 and debugging with Argie. Her company is ViGYAN Inc. Here's some of her early work.

One of the biggest challenges in using RIO is that he’s not able to control the clock at a high resolution. Even if he compiles at a 120MHz, the jitter in the clock because of the logic (when he’s trying to get a specific timing) forces him to resort to external timing sources. The problem is that with the shuttle telemetry application they have 6-8 clocks derived from a master clock. They want to clock 2 to the 23 Hertz (in powers of 2). That’s a challenge to bring signals out of the RIO that has the right clocking capability. There’s a need for timing capability with RIO to make explicit the timing characteristics of a signal.

Argie finds RIO provides some basic architectural rules for building the command frames for telemetry which is frame-based communications. He has found the RIO memory useful with a DMA FIFO for working with the bandwidth between MS Windows and RIO. Before, there was a bottleneck in getting the telemetry from the RIO to the front panel. They have 600 byte frames which update seamlessly, when run at 1 Megabit. They are called NASCOM blocks. It’s the standard for Shuttle payload telemetry.

One challenge remaining is that he is mimicking 422 channels. It usually buffers up the signal in the chip with the comparator inside the chip working at the electrical level. He has taken the contiguous digital signals in the RIO and wrote the differential code inside the RIO as opposed to doing it in a circuit. Impedance matching is a problem. The buffers in the RIO need to be configured to handle it safely given the current levels. The fact that there is a direct connection to the channels means there’s no way to actually put buffers on the board and most of the applications seen in communications are differential in their signal input. If he could put resistors inside the RIO so he could pick 422 differential lines to ground, for impedance matching, that would be really helpful. Right now, he has to make some intricate connections inside the wires in the bundle which can cause reflections.

Best regards,
Hall T.

6 Comments:

Blogger 柯云 said...

2015-11-24 keyun
ghd
toms outlet
coach outlet
nike uk
hermes uk
true religion outlet
coach factory outlet
uggs outlet
cheap toms
adidas shoes uk
canada goose jacket
coach factory outlet
north face jackets
canada gooses outlet
louis vuitton
michael kors
jordan shoes
north face jackets
nike uk
ray ban
ray ban sunglasses
longchamp outlet
christian louboutin uk
burberry outlet
louboutin
ugg boots
canada gooses jackets
adidas originals
louis vuitton bags
nike shoes
jordan pas cher
michael kors outlet
tommy hilfiger outlet
kate spade
kate spade uk
nike air max
polo ralph lauren
jordan 4 toro
louis vuitton
moncler jackets
kate spade handbags

Monday, November 23, 2015 7:44:00 PM  
Blogger Minko Chen said...

nfl jersey wholesale
north face outlet store
michael kors outlet
mulberry outlet store
coach outlet store
soccer jerseys wholesale
nike roshe
cheap football shirts
ugg boots clearance,ugg australia,uggs on sale,ugg slippers,uggs boots,uggs outlet,ugg boots,ugg,uggs
hollister uk
ralph lauren uk
coach outlet online
hermes birkin bag
michael kors uk
true religion outlet
nobis jacket
cheap jordan shoes
true religion jeans
mbt shoes outlet
1211minko

Thursday, December 10, 2015 7:33:00 PM  
Blogger 柯云 said...

2016-03-24keyun
louis vuitton handbags
coach outlet
coach outlet online
adidas uk
michael kors outlet
louis vuitton
ugg outlet
louis vuitton outlet
adidas originals
louis vuitton outlet
cheap toms
burberry outlet
nike air max
juicy couture
toms shoes
fake watches
louboutin
ralph lauren outlet
cheap jordan shoes
jordan 8
tiffany and co
coach outlet store online
oakley sunglasses
ray ban outlet
ray ban
beats solo
kids lebron shoes
hollister kids
louis vuitton bags
running shoes
timberland outlet
coach outlet store online
adidas originals
air jordans
mont blanc legend
true religion outlet
louis vuitton outlet
louis vuitton handbags
lebron 13

Thursday, March 24, 2016 1:26:00 AM  
Blogger Chen Jeje said...

retro jordans
replica christian louboutin
kobe shoes
tiffany and co outlet
ray ban sunglasses outlet
tiffany and co jewelry
ralph lauren polo shirts
oakley vault
cheap nfl jerseys
http://www.michaelkors-outletfactory.us.com
ray ban sunglasses
oakley sunglasses wholesale
michael kors outlet store
http://www.oakleystoreonline.us.org
tiffany and co outlet
discount sunglasses
cheap air jordan
toms outlet store
cheap true religion
michael kors factory outlet

Friday, April 01, 2016 9:13:00 PM  
Blogger 黄帝轩辕 said...

Ray-Ban
one day sale
List:€125.00
Price€19.99
Ray-Ban

Friday, June 03, 2016 12:02:00 PM  
Blogger 1111141414 said...

yeezy boost 350 v2
adidas stan smith women
adidas neo
lebron shoes
chrome hearts outlet
lebron 13 low
adidas stan smith uk
michael kors factory outlet
chrome hearts
patriots jerseys

Monday, June 19, 2017 4:21:00 AM  

Post a Comment

<< Home