From bounce-tacgps-6754@lists.tapr.org Wed Nov 8 18:59:12 2000 Received: from lists.tapr.org (lists.tapr.org [204.17.217.24]) by tapr.org (8.9.3/8.9.3/1.13) with SMTP id SAA21175 for ; Wed, 8 Nov 2000 18:59:11 -0600 (CST) Date: Wed, 8 Nov 2000 18:56:38 Subject: [tacgps] GPS Timing To: "TAPR Special Interest Group" From: "Brian Kirby" List-Unsubscribe: List-Software: Lyris Server version 3.0 List-Subscribe: List-Owner: X-List-Host: Tucson Amateur Packet Radio Reply-To: "TAPR Special Interest Group" Sender: bounce-tacgps-6754@lists.tapr.org Message-Id: Precedence: bulk Got a question on the Motorola Oncore VP. Just how does it derive timing? Are we phase locking on the spread spectrum code (and if so, are we averaging when we have X satellites in view ?). Also, does it compansate for the propagation delay from the satellite to the receiver ? Dr Clark, we have not heard much about your new GPS project, fill us in. --- You are currently subscribed to tacgps as: lyris.tacgps@tapr.org To unsubscribe send a blank email to leave-tacgps-6754G@lists.tapr.org From bounce-tacgps-6754@lists.tapr.org Thu Nov 9 10:22:45 2000 Received: from lists.tapr.org (lists.tapr.org [204.17.217.24]) by tapr.org (8.9.3/8.9.3/1.13) with SMTP id KAA25952 for ; Thu, 9 Nov 2000 10:22:45 -0600 (CST) Message-Id: Subject: [tacgps] Re: GPS Timing Date: Thu, 9 Nov 2000 09:18:55 -0700 x-sender: ebs@biophysics.lanl.gov From: Brooks Shera To: "TAPR Special Interest Group" Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" List-Unsubscribe: List-Software: Lyris Server version 3.0 List-Subscribe: List-Owner: X-List-Host: Tucson Amateur Packet Radio Reply-To: "TAPR Special Interest Group" X-Message-Id: <200011091618.JAA02651@lawyer.lanl.gov> Sender: bounce-tacgps-6754@lists.tapr.org Precedence: bulk The timing might be considered something of a byproduct of the position calculation. The transit time of signals between the gps receiver and 4 or more satellites is observed. From these 4 times and the known position of the satellites at the instant the signals were transmitted, the position of the receiver can be computed. The observed transit times must be corrected for the error in the clock of the gps receiver. This error is computed along with the receiver position, which is why 4 sats are required not just 3. So now the gps receiver knows its clock error and it makes the appropriate adjustment and spits out the 1 pps pulse at the proper GPS time. The receiver does this calculation every second. This explanation is rather simplified but maybe you get the idea. Brooks >Got a question on the Motorola Oncore VP. Just how does it derive timing? >Are we phase locking on the spread spectrum code (and if so, are we >averaging when we have X satellites in view ?). Also, does it compansate >for the propagation delay from the satellite to the receiver ? > >Dr Clark, we have not heard much about your new GPS project, fill us in. --- You are currently subscribed to tacgps as: lyris.tacgps@tapr.org To unsubscribe send a blank email to leave-tacgps-6754G@lists.tapr.org From bounce-tacgps-6754@lists.tapr.org Thu Nov 9 19:19:27 2000 Received: from lists.tapr.org (lists.tapr.org [204.17.217.24]) by tapr.org (8.9.3/8.9.3/1.13) with SMTP id TAA00456 for ; Thu, 9 Nov 2000 19:19:23 -0600 (CST) Message-ID: From: "Kirby, Brian" To: "TAPR Special Interest Group" Subject: [tacgps] Re: GPS Timing Date: Thu, 9 Nov 2000 19:17:16 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C04AB3.FAA8D486" List-Unsubscribe: List-Software: Lyris Server version 3.0 List-Subscribe: List-Owner: X-List-Host: Tucson Amateur Packet Radio Reply-To: "TAPR Special Interest Group" X-Message-Id: Sender: bounce-tacgps-6754@lists.tapr.org Precedence: bulk This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C04AB3.FAA8D486 Content-Type: text/plain I am looking for the "deep" technical details....thanks. > ---------- > From: Brooks Shera[SMTP:ebs@lanl.gov] > Reply To: TAPR Special Interest Group > Sent: Thursday, November 09, 2000 10:18 AM > To: TAPR Special Interest Group > Subject: [tacgps] Re: GPS Timing > > The timing might be considered something of a byproduct of the position > calculation. The transit time of signals between the gps receiver and 4 > or more satellites is observed. From these 4 times and the known > position of the satellites at the instant the signals were transmitted, > the position of the receiver can be computed. The observed transit times > must be corrected for the error in the clock of the gps receiver. This > error is computed along with the receiver position, which is why 4 sats > are required not just 3. So now the gps receiver knows its clock error > and it makes the appropriate adjustment and spits out the 1 pps pulse at > the proper GPS time. The receiver does this calculation every second. > > This explanation is rather simplified but maybe you get the idea. > > Brooks > > > >Got a question on the Motorola Oncore VP. Just how does it derive > timing? > >Are we phase locking on the spread spectrum code (and if so, are we > >averaging when we have X satellites in view ?). Also, does it compansate > > >for the propagation delay from the satellite to the receiver ? > > > >Dr Clark, we have not heard much about your new GPS project, fill us in. > > --- > You are currently subscribed to tacgps as: brian.kirby@msfc.nasa.gov > To unsubscribe send a blank email to leave-tacgps-6754G@lists.tapr.org > ------_=_NextPart_001_01C04AB3.FAA8D486 Content-Type: text/html Content-Transfer-Encoding: quoted-printable RE: [tacgps] Re: GPS Timing

I am looking for the = "deep" technical details....thanks.

    ----------
    From:   = Brooks = Shera[SMTP:ebs@lanl.gov]
    Reply To: =       TAPR Special Interest Group
    Sent:   = Thursday, November 09, 2000 10:18 = AM
    To: =     TAPR Special = Interest Group
    Subject: =        [tacgps] Re: GPS Timing

    The timing might be considered = something of a byproduct of the position
    calculation.  The transit time = of signals between the gps receiver and 4
    or more satellites is observed.  = >From these 4 times and the known
    position of the satellites at the = instant the signals were transmitted,
    the position of the receiver can be = computed.  The observed transit times
    must be corrected for the error in = the clock of the gps receiver.  This
    error is computed along with the = receiver position, which is why 4 sats
    are required not just 3. So now the = gps receiver knows its clock error
    and it makes the appropriate = adjustment and spits out the 1 pps pulse at
    the proper GPS time. The receiver = does this calculation every second. 

    This explanation is rather simplified = but maybe you get the idea.

    Brooks    


    >Got a question on the Motorola = Oncore VP.  Just how does it derive timing?
    >Are we phase locking on the = spread spectrum code (and if so, are we
    >averaging when we have X = satellites in view ?).  Also, does it compansate
    >for the propagation delay from = the satellite to the receiver ?
    >
    >Dr Clark, we have not heard much = about your new GPS project, fill us in.

    ---
    You are currently subscribed to = tacgps as: brian.kirby@msfc.nasa.gov
    To unsubscribe send a blank email to = leave-tacgps-6754G@lists.tapr.org

------_=_NextPart_001_01C04AB3.FAA8D486-- --- You are currently subscribed to tacgps as: lyris.tacgps@tapr.org To unsubscribe send a blank email to leave-tacgps-6754G@lists.tapr.org From bounce-tacgps-6754@lists.tapr.org Tue Nov 14 18:49:19 2000 Received: from lists.tapr.org (lists.tapr.org [204.17.217.24]) by tapr.org (8.9.3/8.9.3/1.13) with SMTP id SAA04631 for ; Tue, 14 Nov 2000 18:49:16 -0600 (CST) Message-Id: Subject: [tacgps] John Elliss - please stand up Date: Tue, 14 Nov 2000 17:44:57 -0700 x-sender: ebs@biophysics.lanl.gov From: Brooks Shera To: "TAPR Special Interest Group" Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" List-Unsubscribe: List-Software: Lyris Server version 3.0 List-Subscribe: List-Owner: X-List-Host: Tucson Amateur Packet Radio Reply-To: "TAPR Special Interest Group" X-Message-Id: <200011150044.RAA09865@lawyer.lanl.gov> Sender: bounce-tacgps-6754@lists.tapr.org Precedence: bulk Sorry for the bandwidth, but a friend is looking for a PCB design by John Ellis, ke6qlb, who probably still reads this group. If you are out there John please send me (not the group) your current e-mail address. Tnx. Brooks shera@rt66.com --- You are currently subscribed to tacgps as: lyris.tacgps@tapr.org To unsubscribe send a blank email to leave-tacgps-6754G@lists.tapr.org From bounce-tacgps-6754@lists.tapr.org Thu Nov 30 01:16:40 2000 Received: from lists.tapr.org (lists.tapr.org [204.17.217.24]) by tapr.org (8.9.3/8.9.3/1.13) with SMTP id BAA21642 for ; Thu, 30 Nov 2000 01:16:40 -0600 (CST) Date: Thu, 30 Nov 2000 1:13:45 Subject: [tacgps] Ultra Wide Band To: "TAPR Special Interest Group" From: "Brian Kirby" List-Unsubscribe: List-Software: Lyris Server version 3.0 List-Subscribe: List-Owner: X-List-Host: Tucson Amateur Packet Radio Reply-To: "TAPR Special Interest Group" Sender: bounce-tacgps-6754@lists.tapr.org Message-Id: Precedence: bulk Found a NTIA report were they have started some UWB test to see how its going to impact GPS. Its located at: http://www.ntia.doc.gov/osmhome/uwbtestplan/gpsuwbtp.htm --- You are currently subscribed to tacgps as: lyris.tacgps@tapr.org To unsubscribe send a blank email to leave-tacgps-6754G@lists.tapr.org