Re: [casper] CASPER design question
hi dale and neal, do you know how many frequency channels are needed? or is this a continuum correlator ? i think the lowest cost system would be a conventional casper packetized FX correlator architecture using snap1 boards, a 40Gbit ethernet switch (for the corner turn), possibly adding an ADC16 board to each snap1 (to get more analog inputs per snap1), and optionally using GPU's to correlate instead of FPGA's. snap1 fpga boards can sample 12 inputs at 250 Msps 6 inputs at 500 Msps 3 inputs at 1000 Msps if one plugs an ADC16 board into the snap1 board, then you get an additional 16 inputs at 250 Msps 8 inputs at 500 Msps 4 inputs at 900 Msps but depending on how many bits are needed to transmit to the X engine (most people use 4 bit real, 4 bit imaginary), you might run out of snap1 ethernet bandwidth (20Gbit/sec input, and 20 Gbit/sec output max) before you can use all the analog inputs from the additional ADC16 board. best wishes, dan On Mon, Dec 24, 2018 at 8:48 AM Gary, Dale E. wrote: > Hi Casperites, > > I received an inquiry from Neal Hurlburt, from Lockheed Martin (Palo > Alto), who wants to look into the possibility of using CASPER hardware and > tools to design a prototype system for interferometry of optical signals. > So far the specifications are quite fluid (see message below)--they would > like a 500 MHz bandwidth, but would accept as low as 50 MHz. However, he > is looking for 60-100 inputs, so I guess he is driven to the lower end of > this bandwidth range. Neal is not an engineer, but he can relay some > suggestions from this list to engineering support at Lockheed. If anyone > has some suggestions for Neal, especially any projects of a similar nature, > he would be delighted to hear from you. I added his name to the cc list. > > Many thanks, > Dale > > Hi Dale, > > Thanks for the info on your experience with CASPER. At a minimum, we are > looking for a system that can digitize and correlate about 60 elements at > 50 to 500Mhz each. It sounds like CASPER is a good starting point. Who do > you suggest we talk to at Berkeley? > > Thanks, > Neal > > > Neal Hurlburt > Manager, Space Science & Software > Space Science & Instrumentation > Lockheed Martin ATC > 650-354-5504 > hurlb...@lmsal.com > > -- > You received this message because you are subscribed to the Google Groups " > casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. > -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
RE: [casper] CASPER design question
Dear Gary and Neal, I have similar requirements for non-radioastronomy passive mm-wave imaging applications, which may lie close to those of Lockheed Martin. I did find it difficult to adapt CASPER hardware as it has requirements not entirely aligned with these non-classic radioastronomy applications, ie it requires ~1 GHz bandwidth on hundreds of receiver channels. However, I watch this space in case capabilities start to emerge here where I could collaborate with community for spin out applications in pmmw imaging where powerful cross-correlators are required. Many thanks, Neil From: Gary, Dale E. [mailto:dale.e.g...@njit.edu] Sent: 24 December 2018 16:48 To: casper list Cc: Neal Hurlburt Subject: [casper] CASPER design question Hi Casperites, I received an inquiry from Neal Hurlburt, from Lockheed Martin (Palo Alto), who wants to look into the possibility of using CASPER hardware and tools to design a prototype system for interferometry of optical signals. So far the specifications are quite fluid (see message below)--they would like a 500 MHz bandwidth, but would accept as low as 50 MHz. However, he is looking for 60-100 inputs, so I guess he is driven to the lower end of this bandwidth range. Neal is not an engineer, but he can relay some suggestions from this list to engineering support at Lockheed. If anyone has some suggestions for Neal, especially any projects of a similar nature, he would be delighted to hear from you. I added his name to the cc list. Many thanks, Dale Hi Dale, Thanks for the info on your experience with CASPER. At a minimum, we are looking for a system that can digitize and correlate about 60 elements at 50 to 500Mhz each. It sounds like CASPER is a good starting point. Who do you suggest we talk to at Berkeley? Thanks, Neal Neal Hurlburt Manager, Space Science & Software Space Science & Instrumentation Lockheed Martin ATC 650-354-5504 hurlb...@lmsal.com<mailto:hurlb...@lmsal.com> -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu<mailto:casper@lists.berkeley.edu>" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu<mailto:casper+unsubscr...@lists.berkeley.edu>. To post to this group, send email to casper@lists.berkeley.edu<mailto:casper@lists.berkeley.edu>. "Before acting on this email or opening any attachments you should read the Manchester Metropolitan University email disclaimer available on its website http://www.mmu.ac.uk/emaildisclaimer " -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
Re: [casper] CASPER design question
What's the requirement for phase noise between the channels? On Mon, Dec 24, 2018 at 8:48 AM Gary, Dale E. wrote: > Hi Casperites, > > I received an inquiry from Neal Hurlburt, from Lockheed Martin (Palo > Alto), who wants to look into the possibility of using CASPER hardware and > tools to design a prototype system for interferometry of optical signals. > So far the specifications are quite fluid (see message below)--they would > like a 500 MHz bandwidth, but would accept as low as 50 MHz. However, he > is looking for 60-100 inputs, so I guess he is driven to the lower end of > this bandwidth range. Neal is not an engineer, but he can relay some > suggestions from this list to engineering support at Lockheed. If anyone > has some suggestions for Neal, especially any projects of a similar nature, > he would be delighted to hear from you. I added his name to the cc list. > > Many thanks, > Dale > > Hi Dale, > > Thanks for the info on your experience with CASPER. At a minimum, we are > looking for a system that can digitize and correlate about 60 elements at > 50 to 500Mhz each. It sounds like CASPER is a good starting point. Who do > you suggest we talk to at Berkeley? > > Thanks, > Neal > > > Neal Hurlburt > Manager, Space Science & Software > Space Science & Instrumentation > Lockheed Martin ATC > 650-354-5504 > hurlb...@lmsal.com > > -- > You received this message because you are subscribed to the Google Groups " > casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. > -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
[casper] CASPER design question
Hi Casperites, I received an inquiry from Neal Hurlburt, from Lockheed Martin (Palo Alto), who wants to look into the possibility of using CASPER hardware and tools to design a prototype system for interferometry of optical signals. So far the specifications are quite fluid (see message below)--they would like a 500 MHz bandwidth, but would accept as low as 50 MHz. However, he is looking for 60-100 inputs, so I guess he is driven to the lower end of this bandwidth range. Neal is not an engineer, but he can relay some suggestions from this list to engineering support at Lockheed. If anyone has some suggestions for Neal, especially any projects of a similar nature, he would be delighted to hear from you. I added his name to the cc list. Many thanks, Dale Hi Dale, Thanks for the info on your experience with CASPER. At a minimum, we are looking for a system that can digitize and correlate about 60 elements at 50 to 500Mhz each. It sounds like CASPER is a good starting point. Who do you suggest we talk to at Berkeley? Thanks, Neal Neal Hurlburt Manager, Space Science & Software Space Science & Instrumentation Lockheed Martin ATC 650-354-5504 hurlb...@lmsal.com -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
