Re: [time-nuts] Fwd: CGSIC: FW: New NANU 2014090
Not sure if this is quite the right platform, but for someone wanting to experiment it may be worth a look... https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver http://www.swiftnav.com/piksi.html Dan Date: Tue, 16 Dec 2014 16:01:28 -0800 From: Jim Luxjim...@earthlink.net To:time-nuts@febo.com Subject: Re: [time-nuts] Fwd: CGSIC: FW: New NANU 2014090 Message-ID:5490c7d8.9060...@earthlink.net Content-Type: text/plain; charset=UTF-8; format=flowed On 12/16/14, 3:36 PM, Magnus Danielson wrote: Paul, That is indeed the question. Considering that the signal is better supported, I hope the light goes on somewhere. The signals is all 1,023 Mchips/s, just a thad different. Should be possible to pull off if people want to do dual frequency without going full bandwidth. Then again, if you are willing to pay good money, you can get it today. what about one of the software receivers? I would think that making L2 and L5 filters isn't that tough, so all you need is the back end. ___ 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.
Re: [time-nuts] Fwd: CGSIC: FW: New NANU 2014090
On 12/17/14, 5:20 AM, Dan Kemppainen wrote: Not sure if this is quite the right platform, but for someone wanting to experiment it may be worth a look... https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver http://www.swiftnav.com/piksi.html from that page: 3-bit, 16.368 MS/s L1 front-end supports $500 It uses the MAX2769, which has a tuning range of 1550-1610. -- We get good results at JPL with direct conversion receivers (versus the MAX 2769 is basically a single conversion superhet).. a chain of amplifiers and BPFs followed by a one bit quantizer like an ECL D flipflop clocked by the reference clock chosen to put the aliases at convenient places in band. I suspect, though, that the wide open LNA in the typical JPL receiver is susceptible to interference. Most survey quality receivers (except from Javad, which are LightSquared Readygrin) have pretty bad interference rejection: they want the least stuff that might introduce a phase shift in the signal path: It's all basic time-nuts stuff.. you get that precise position by knowing what the carrier phase is to a fraction of a gnat's eyelash. ___ 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.
[time-nuts] Fwd: CGSIC: FW: New NANU 2014090
Fellow time-nuts, We have now 15 L2C signals and 8 L5 signals in the air. An L2C only receiver start to become useful in it's own right. L1 C/A, L2C and L5 would allow for tripple frequency receiver. Things is starting to be interesting, if you have the receiver for it. With a double-frequency receiver, the ionospheric errors could be significantly reduced. Better position and better time-stability. Cheers, Magnus Forwarded Message Subject: CGSIC: FW: New NANU 2014090 Date: Mon, 15 Dec 2014 14:16:29 + From: Civil Global Positioning System Service Interface Committee (CGSIC) cg...@cgls.uscg.mil Reply-To: cg...@cgls.uscg.mil To: cg...@cgls.uscg.mil cg...@cgls.uscg.mil All CGSIC: The eighth GPS-IIF satellite, SVN-69/PRN-03, launched on 29 October 2014, has completed its operational checkout and was set to healthy and usable Friday, December 12, 2014. See NANU 2014090 below. This brings the number of satellites transmitting the L2C signal to 15 and those transmitting the L5 signal to 08. The next GPS-IIF satellite, IIF-9/SVN-70 is tentatively scheduled for launch in March of 2015. V/R Rick Hamilton CGSIC Executive Secretariat GPS Information Analysis Team Lead USCG Navigation Center 703-313-5930 = -Original Message- From: NANU [mailto:nanu-boun...@cgls.uscg.mil] On Behalf Of TIS-PF-NISWS Sent: Friday, December 12, 2014 5:17 PM To: NANU list server Subject: New NANU 2014090 NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014090 SUBJ: SVN69 (PRN03) USABLE JDAY 346/2119 1. NANU TYPE: USABINIT NANU NUMBER: 2014090 NANU DTG: 122108Z DEC 2014 REFERENCE NANU: N/A REF NANU DTG: N/A SVN: 69 PRN: 03 START JDAY: 346 START TIME ZULU: 2119 START CALENDAR DATE: 12 DEC 2014 STOP JDAY: N/A STOP TIME ZULU: N/A STOP CALENDAR DATE: N/A 2. CONDITION: GPS SATELLITE SVN69 (PRN03) WAS USABLE AS OF JDAY 346 (12 DEC 2014) BEGINNING 2119 ZULU. 3. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV MILITARY - GPS OPERATIONS CENTER at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541, COMM 719-567-2541, gpsoperationscen...@us.af.mil, HTTPS://GPS.AFSPC.AF.MIL MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514, COMM 805-606-3514, jspoccombat...@vandenberg.af.mil To unsubscribe, visit: http://www.navcen.uscg.gov/?pageName=listserverunsubscribesrvr=Nanu ___ CGSIC one-way mailing list Unsubscribe: http://cgls.uscg.mil/mailman/listinfo/cgsic If you would like to report abuse of the CGLS listserv please send an email to: cglsad...@uscg.mil ___ 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.
Re: [time-nuts] Fwd: CGSIC: FW: New NANU 2014090
Magnus exciting. Now which ublox receiver is that on ebay? :-) Regards Paul WB8TSL On Tue, Dec 16, 2014 at 4:09 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: Fellow time-nuts, We have now 15 L2C signals and 8 L5 signals in the air. An L2C only receiver start to become useful in it's own right. L1 C/A, L2C and L5 would allow for tripple frequency receiver. Things is starting to be interesting, if you have the receiver for it. With a double-frequency receiver, the ionospheric errors could be significantly reduced. Better position and better time-stability. Cheers, Magnus Forwarded Message Subject: CGSIC: FW: New NANU 2014090 Date: Mon, 15 Dec 2014 14:16:29 + From: Civil Global Positioning System Service Interface Committee (CGSIC) cg...@cgls.uscg.mil Reply-To: cg...@cgls.uscg.mil To: cg...@cgls.uscg.mil cg...@cgls.uscg.mil All CGSIC: The eighth GPS-IIF satellite, SVN-69/PRN-03, launched on 29 October 2014, has completed its operational checkout and was set to healthy and usable Friday, December 12, 2014. See NANU 2014090 below. This brings the number of satellites transmitting the L2C signal to 15 and those transmitting the L5 signal to 08. The next GPS-IIF satellite, IIF-9/SVN-70 is tentatively scheduled for launch in March of 2015. V/R Rick Hamilton CGSIC Executive Secretariat GPS Information Analysis Team Lead USCG Navigation Center 703-313-5930 = -Original Message- From: NANU [mailto:nanu-boun...@cgls.uscg.mil] On Behalf Of TIS-PF-NISWS Sent: Friday, December 12, 2014 5:17 PM To: NANU list server Subject: New NANU 2014090 NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014090 SUBJ: SVN69 (PRN03) USABLE JDAY 346/2119 1. NANU TYPE: USABINIT NANU NUMBER: 2014090 NANU DTG: 122108Z DEC 2014 REFERENCE NANU: N/A REF NANU DTG: N/A SVN: 69 PRN: 03 START JDAY: 346 START TIME ZULU: 2119 START CALENDAR DATE: 12 DEC 2014 STOP JDAY: N/A STOP TIME ZULU: N/A STOP CALENDAR DATE: N/A 2. CONDITION: GPS SATELLITE SVN69 (PRN03) WAS USABLE AS OF JDAY 346 (12 DEC 2014) BEGINNING 2119 ZULU. 3. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV MILITARY - GPS OPERATIONS CENTER at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541, COMM 719-567-2541, gpsoperationscen...@us.af.mil, HTTPS://GPS.AFSPC.AF.MIL MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514, COMM 805-606-3514, jspoccombat...@vandenberg.af.mil To unsubscribe, visit: http://www.navcen.uscg.gov/?pageName= listserverunsubscribesrvr=Nanu ___ CGSIC one-way mailing list Unsubscribe: http://cgls.uscg.mil/mailman/listinfo/cgsic If you would like to report abuse of the CGLS listserv please send an email to: cglsad...@uscg.mil ___ 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. ___ 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.
Re: [time-nuts] Fwd: CGSIC: FW: New NANU 2014090
Paul, That is indeed the question. Considering that the signal is better supported, I hope the light goes on somewhere. The signals is all 1,023 Mchips/s, just a thad different. Should be possible to pull off if people want to do dual frequency without going full bandwidth. Then again, if you are willing to pay good money, you can get it today. Cheers, Magnus On 12/16/2014 11:41 PM, paul swed wrote: Magnus exciting. Now which ublox receiver is that on ebay? :-) Regards Paul WB8TSL On Tue, Dec 16, 2014 at 4:09 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: Fellow time-nuts, We have now 15 L2C signals and 8 L5 signals in the air. An L2C only receiver start to become useful in it's own right. L1 C/A, L2C and L5 would allow for tripple frequency receiver. Things is starting to be interesting, if you have the receiver for it. With a double-frequency receiver, the ionospheric errors could be significantly reduced. Better position and better time-stability. Cheers, Magnus Forwarded Message Subject: CGSIC: FW: New NANU 2014090 Date: Mon, 15 Dec 2014 14:16:29 + From: Civil Global Positioning System Service Interface Committee (CGSIC) cg...@cgls.uscg.mil Reply-To: cg...@cgls.uscg.mil To: cg...@cgls.uscg.mil cg...@cgls.uscg.mil All CGSIC: The eighth GPS-IIF satellite, SVN-69/PRN-03, launched on 29 October 2014, has completed its operational checkout and was set to healthy and usable Friday, December 12, 2014. See NANU 2014090 below. This brings the number of satellites transmitting the L2C signal to 15 and those transmitting the L5 signal to 08. The next GPS-IIF satellite, IIF-9/SVN-70 is tentatively scheduled for launch in March of 2015. V/R Rick Hamilton CGSIC Executive Secretariat GPS Information Analysis Team Lead USCG Navigation Center 703-313-5930 = -Original Message- From: NANU [mailto:nanu-boun...@cgls.uscg.mil] On Behalf Of TIS-PF-NISWS Sent: Friday, December 12, 2014 5:17 PM To: NANU list server Subject: New NANU 2014090 NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014090 SUBJ: SVN69 (PRN03) USABLE JDAY 346/2119 1. NANU TYPE: USABINIT NANU NUMBER: 2014090 NANU DTG: 122108Z DEC 2014 REFERENCE NANU: N/A REF NANU DTG: N/A SVN: 69 PRN: 03 START JDAY: 346 START TIME ZULU: 2119 START CALENDAR DATE: 12 DEC 2014 STOP JDAY: N/A STOP TIME ZULU: N/A STOP CALENDAR DATE: N/A 2. CONDITION: GPS SATELLITE SVN69 (PRN03) WAS USABLE AS OF JDAY 346 (12 DEC 2014) BEGINNING 2119 ZULU. 3. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV MILITARY - GPS OPERATIONS CENTER at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541, COMM 719-567-2541, gpsoperationscen...@us.af.mil, HTTPS://GPS.AFSPC.AF.MIL MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514, COMM 805-606-3514, jspoccombat...@vandenberg.af.mil To unsubscribe, visit: http://www.navcen.uscg.gov/?pageName= listserverunsubscribesrvr=Nanu ___ CGSIC one-way mailing list Unsubscribe: http://cgls.uscg.mil/mailman/listinfo/cgsic If you would like to report abuse of the CGLS listserv please send an email to: cglsad...@uscg.mil ___ 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. ___ 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. ___ 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.
Re: [time-nuts] Fwd: CGSIC: FW: New NANU 2014090
On 12/16/14, 3:36 PM, Magnus Danielson wrote: Paul, That is indeed the question. Considering that the signal is better supported, I hope the light goes on somewhere. The signals is all 1,023 Mchips/s, just a thad different. Should be possible to pull off if people want to do dual frequency without going full bandwidth. Then again, if you are willing to pay good money, you can get it today. what about one of the software receivers? I would think that making L2 and L5 filters isn't that tough, so all you need is the back end. ___ 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.
Re: [time-nuts] Fwd: CGSIC: FW: New NANU 2014090
On Wed, Dec 17, 2014 at 12:01 AM, Jim Lux jim...@earthlink.net wrote: On 12/16/14, 3:36 PM, Magnus Danielson wrote: what about one of the software receivers? I would think that making L2 and L5 filters isn't that tough, so all you need is the back end. I'm pretty sure GNSS-SDRLIB supports L2C, you can see it working with a ~$400 bladerf http://www.rtl-sdr.com/real-time-gps-positioning-bladerf/ Though getting dual band, in phase, requires something like a $1100 USRP B210... and that that point you're getting in to the price-points where you can find surplus survey receivers and such. From a timenuts perspective, it may be more interesting to go the SDR route, since the survey receiver is not likely to have a lot of affordances for timing applications and there is a lot of interesting things you could do in software. There have been some people talking about GNSS targeted SDRs, e.g. things with 4x in phase down mixers and backing ADCs that could simultaneously capture every current/known GNSS signal and send them down to the computer, at a reasonably low price... but I think none have moved past the prototyping phase. The nearest I'm aware that seems actually available is http://www.onetalent-gnss.com/ideas/software-defined-radio/sdrnav40 but I don't really know anything about it. (e.g. if it's real, what the software support story is, etc.) ___ 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.
Re: [time-nuts] Fwd: CGSIC: FW: New NANU 2014090
HI On Dec 16, 2014, at 8:14 PM, Gregory Maxwell gmaxw...@gmail.com wrote: On Wed, Dec 17, 2014 at 12:01 AM, Jim Lux jim...@earthlink.net wrote: On 12/16/14, 3:36 PM, Magnus Danielson wrote: what about one of the software receivers? I would think that making L2 and L5 filters isn't that tough, so all you need is the back end. I'm pretty sure GNSS-SDRLIB supports L2C, you can see it working with a ~$400 bladerf http://www.rtl-sdr.com/real-time-gps-positioning-bladerf/ Though getting dual band, in phase, requires something like a $1100 USRP B210... and that that point you're getting in to the price-points where you can find surplus survey receivers and such. From a timenuts perspective, it may be more interesting to go the SDR route, since the survey receiver is not likely to have a lot of affordances for timing applications and there is a lot of interesting things you could do in software. That qualifier is indeed something I should have stated earlier. My assumption is that a high quality timing receiver is the target. The whole fixed location / single sat solution / per sat solution stuff is what I’m thinking about. No I didn’t mention that earlier … I should have. Bob There have been some people talking about GNSS targeted SDRs, e.g. things with 4x in phase down mixers and backing ADCs that could simultaneously capture every current/known GNSS signal and send them down to the computer, at a reasonably low price... but I think none have moved past the prototyping phase. The nearest I'm aware that seems actually available is http://www.onetalent-gnss.com/ideas/software-defined-radio/sdrnav40 but I don't really know anything about it. (e.g. if it's real, what the software support story is, etc.) ___ 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. ___ 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.
