Re: Maxim 2741
Clifford Kelley <[email protected]> Sat, 16 Aug 2008 11:08:45 -0700 (GMT-07:00)
| Newsgroups | gmane.comp.hardware.gps.opensource |
|---|---|
| Message-ID | <27169394.1218910125494.JavaMail.root@mswamui-cedar.atl.sa.earthlink.net> |
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<P>Michael,</P>
<P>One of the goals of Soft OSGPS is to become hardware agnostic. The=
re are a number of front end chips that are available and while some are ea=
sier than others to interface to a USB Dongle I know that Doug Baker has be=
en looking into a number of them.</P>
<P>Generally modifying the carrier and code loops with a larger noise bandw=
idth and/or changing to a 3rd order loop is required to get high "G" tracki=
ng without aiding with an IMU etc.</P>
<P>Best regards,</P>
<P>Cliff<BR><BR><BR></P>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 0px; BORDER-LEFT: #000=
0ff 2px solid">-----Original Message----- <BR>From: Michael Golan <MG@MIVZA=
K.COM><BR>Sent: Aug 12, 2008 6:22 PM <BR>To: [email protected].=
edu <BR>Subject: [OpenSource_GPS] Maxim 2741 <BR><BR><ZZZHTML xmlns=3D"http=
://www.w3.org/TR/REC-html40" xmlns:w=3D"urn:schemas-microsoft-com:office:wo=
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<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial">Hi All,<?xml:namespace prefix =3D o /><o:p></o:p><=
/SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial">I'm certain this is no news to you:<o:p></o:p></SP=
AN></FONT></P>
<DIV style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: me=
dium none; PADDING-LEFT: 0cm; PADDING-BOTTOM: 1pt; BORDER-LEFT: medium none=
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<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P></DIV>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><A href=3D"http://www.maxim-ic.com/products/wirele=
ss/gps/max2741.cfm">http://www.maxim-ic.com/products/wireless/gps/max2741.c=
fm</A><o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3D"Times New Roman" size=3D3><SPAN style=3D"=
FONT-SIZE: 12pt">The MAX2741 L1-band GPS receiver IC =E2=80=A6This dual-con=
version receiver downconverts the 1575.42MHz GPS signal to a 37.38MHz first=
IF, and then a 3.78MHz second IF. An integrated 2- or 3-bit ADC (1- bit SI=
GN, 1- or 2-bit MAG selectable) samples the second IF and outputs the digit=
ized signals to the baseband processor.<o:p></o:p></SPAN></FONT></P>
<DIV style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: me=
dium none; PADDING-LEFT: 0cm; PADDING-BOTTOM: 1pt; BORDER-LEFT: medium none=
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<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3D"Times New Roman" size=3D3><SPAN style=3D"=
FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial">If I understand correctly, this could be an ideal =
basis for a USB "dongle" GPS unit which, with osGPS, will provide a unique =
solution.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial">I'm wondering if anyone has looked into modifying =
the software to use this unit?<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial">I'm specifically interested in running osGPS in a =
special application (aerobatic aircraft) where 10G or more acceleration gen=
erally cause all civilian GPS units to lose tracking=E2=80=A6 the applicati=
on is used for pilot feedback, not anything that is mission-critical.<o:p><=
/o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial">At this point, I'm only vaguely familiar with GPS =
internals, but I believe I can learn the math involved and modify osGPS to =
feet my special needs (shortening PLL loops to track under high G?) if I ha=
ve a practical hardware/software solution (on board computer must be Ultra-=
mobile PC, no moving parts, no PCI card)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial">Many thanks<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"> Michael Golan<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal dir=3Dltr style=3D"DIRECTION: ltr; unicode-bidi: embed=
; TEXT-ALIGN: left"><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: 1=
0pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P></DIV></ZZZBODY=
></ZZZHTML></BLOCKQUOTE></BODY><pre>
The OpenSource GPS software is free, therefore the author makes no warranty=
or=20
representation either express or implied with respect to this software or=
=20
communication including its quality, merchantability, or fitness for a part=
icular purpose. =20
In no event will the author be liable for direct, indirect, special,=20
incidental, or consequential damages arising out of the use or inability to=
use this=20
software or communication even if the author has been advised of the possib=
ility=20
of such damages.</pre>
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