About Navigation Data overflow

"??" <[email protected]> Fri, 16 May 2008 10:24:08 +0800
Newsgroups	gmane.comp.hardware.gps.opensource
Message-ID	<003601c8b6fb$f136b500$7001a8c0@dlmu7657b7f615>
Dear Sir:
 =

 I'm a graduate student. I'm very interested in OSGPS. I found in track pro=
gram ,there is software dealing with data overflow, as following

if ((ic->frame_ready) && (bitnum < 16)) {
      /* Overflow */
      if (c->bit)
        set_bit (ch, (void *) &data_overflow[bitnum]);
      else
        clear_bit (ch, (void *) &data_overflow[bitnum]);
    }
    else {
      if (c->bit)
        set_bit (ch, (void *) &data_mesg[bitnum]);
      else
        clear_bit (ch, (void *) &data_mesg[bitnum]);
    }

I think if there is data overflow, there will be error in navigation data. =
I wanna know is the condition of data overflow  exist?

Best Regards!

Looking forward for your reply!
----- Original Message ----- =

From: <[email protected]>
To: <[email protected]>
Sent: Friday, May 16, 2008 3:00 AM
Subject: opensource_gps Digest, Vol 49, Issue 4


> Send opensource_gps mailing list submissions to
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> Today's Topics:
> =

>   1. Re: About pull_in state Parameter (??)
> =

> =

> ----------------------------------------------------------------------
> =

> Message: 1
> Date: Thu, 15 May 2008 17:58:40 +0800
> From: ?? <[email protected]>
> Subject: Re: [OpenSource_GPS] About pull_in state Parameter
> To: <[email protected]>
> Message-ID: <003501c8b672$4763d0f0$7001a8c0@dlmu7657b7f615>
> Content-Type: text/plain; charset=3D"gb2312"
> =

> Dear Sir,
> =

> I still wonder why we choose 45 deg as  the threshold ?
> =

> And I have another question. According to what ,you decide  the bandwide =
of the code loop and carrier loop? Did you do some simulation? Would you se=
nd me something  about the simulation?
> =

> Thanks.
> =

> Looking forward for your reply.
> =

> Best regards
> =

>                                                    Yours,
>                                                    Jiang Yi
> =

> ----- Original Message ----- =

> From: "Clifford Kelley" <[email protected]>
> To: "??" <[email protected]>
> Sent: Tuesday, May 13, 2008 8:56 AM
> Subject: Re: [OpenSource_GPS] About pull_in state Parameter
> =

> =

>> The threshold for power is set at the sqrt of 2 times the rms value.  To=
 approximate this with integer values it was multiplied by 14 first and the=
n divided by 10.
>> =

>> 1200 was chosen as an approximate value of 45 deg based on the scaling u=
sed in the 4 quadrant arc tangent function.
>> =

>> I hope this helps,
>> =

>> Cliff
>> =

>> -----Original Message-----
>>>From: ?? <[email protected]>
>>>Sent: May 8, 2008 7:41 PM
>>>To: [email protected]
>>>Subject: [OpenSource_GPS] About pull_in state Parameter
>>>
>>>Dear Sir:
>>> =

>>> I'm a graduate student. I'm very interested in OSGPS. I wanna know the =
detail about OSGPS.
>>>
>>>In the end of pull_in state, the software use    if (c->avg > 14 * rms /=
 10  && c->th_rms < 12000  && c->ms_set) as the condition for track state.
>>>
>>>My problem :
>>>1   avg > 14 * rms / 10  ,what's the meaning  of 14 and 10
>>>2    c->th_rms < 12000   why should we choose 12000 as the the threshold
>>>
>>>Looking forward for your reply!
>>>Best Regard!
>>>
>>>
>>>----- Original Message ----- =

>>>From: <[email protected]>
>>>To: <[email protected]>
>>>Sent: Friday, May 09, 2008 3:00 AM
>>>Subject: opensource_gps Digest, Vol 49, Issue 2
>>>
>>>
>>>> Send opensource_gps mailing list submissions to
>>>> [email protected]
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>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>> http://lists.psas.pdx.edu/cgi-bin/mailman/listinfo/opensource_gps
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>>>> =

>>>> You can reach the person managing the list at
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>>>> than "Re: Contents of opensource_gps digest..."
>>>> =

>>>> =

>>>> Today's Topics:
>>>> =

>>>>   1. ???? ([email protected])
>>>>   2. Re: Why add 0.5 in pull_in and track parameter (??)
>>>> =

>>>> =

>>>> ----------------------------------------------------------------------
>>>> =

>>>> Message: 1
>>>> Date: Wed, 7 May 2008 12:00:42 -0700
>>>> From: <[email protected]>
>>>> Subject: [OpenSource_GPS] ????
>>>> To: [email protected]
>>>> Message-ID: <[email protected]>
>>>> Content-Type: text/plain; charset=3D"us-ascii"
>>>> =

>>>> An HTML attachment was scrubbed...
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>>>> =

>>>> ------------------------------
>>>> =

>>>> Message: 2
>>>> Date: Thu, 8 May 2008 09:55:09 +0800
>>>> From: "??" <[email protected]>
>>>> Subject: Re: [OpenSource_GPS] Why add 0.5 in pull_in and track
>>>> parameter
>>>> To: <[email protected]>
>>>> Message-ID: <000b01c8b0ae$8e56a420$7001a8c0@dlmu7657b7f615>
>>>> Content-Type: text/plain; charset=3D"iso-8859-1"
>>>> =

>>>> Dear Sir:
>>>> =

>>>> I found Open Source software is :
>>>> =

>>>> pull_carr_C1=3D(int) (1.69852*Bnpullcarr/Carrier_DCO_Delta/(4.0+5.333*=
Bnpullcarr/1000.0+(1.8856*Bnpullcarr/1000.0)*
>>>>  (1.8856*Bnpullcarr/1000.0))+0.5);
>>>> =

>>>> pull_carr_C2=3D(int) (0.6369183/Carrier_DCO_Delta*(1.8856*Bnpullcarr/1=
000.0)*(1.8856*Bnpullcarr/1000.0)*1000.0/
>>>>  (4.0+5.333*Bnpullcarr/1000.0+(1.8856*Bnpullcarr/1000.0)*(1.8856*Bnpul=
lcarr/1000.0))+0.5);
>>>> =

>>>> pull_code_C1=3D(int) (10.598/Code_DCO_Delta*Bnpullcode/(4.0+5.333*Bnpu=
llcode/1000.0+(1.8856*Bnpullcode/1000.0)*
>>>>  (1.8856*Bnpullcode/1000.0))+0.5);
>>>> =

>>>> pull_code_C2=3D(int) (4.028/Code_DCO_Delta*(1.8856*Bnpullcode/1000.0)*=
(1.8856*Bnpullcode/1000.0)*1000.0/
>>>>  (4.0+5.333*Bnpullcode/1000.0+(1.8856*Bnpullcode/1000.0)*(1.8856*Bnpul=
lcode/1000.0))+0.5);
>>>> =

>>>> I know C1 C2  is =

>>>> pull_carr_C1 =3D 1/(Ko*Kn)*8*zeta*On*Ts/(4+4*zeta*On*Ts+(On*Ts)^2);    =

>>>> pull_carr_C2 =3D 1/(Ko*Kn)*4*(On*Ts)^2/(4+4*zeta*On*Ts+(On*Ts)^2); =

>>>> =

>>>> By compared, I wonder why add 0.5 to C1 and C2
>>>> =

>>>> =

>>>> ----- Original Message ----- =

>>>> From: <[email protected]>
>>>> To: <[email protected]>
>>>> Sent: Thursday, May 08, 2008 3:00 AM
>>>> Subject: opensource_gps Digest, Vol 49, Issue 1
>>>> =

>>>> =

>>>>> Send opensource_gps mailing list submissions to
>>>>> [email protected]
>>>>> =

>>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>> http://lists.psas.pdx.edu/cgi-bin/mailman/listinfo/opensource_gps
>>>>> or, via email, send a message with subject or body 'help' to
>>>>> [email protected]
>>>>> =

>>>>> You can reach the person managing the list at
>>>>> [email protected]
>>>>> =

>>>>> When replying, please edit your Subject line so it is more specific
>>>>> than "Re: Contents of opensource_gps digest..."
>>>>> =

>>>>> =

>>>>> Today's Topics:
>>>>> =

>>>>>   1. osgps run under windows xp (yuguangzhan)
>>>>> =

>>>>> =

>>>>> ----------------------------------------------------------------------
>>>>> =

>>>>> Message: 1
>>>>> Date: Wed, 7 May 2008 12:05:10 +0000 (UTC)
>>>>> From: yuguangzhan <[email protected]>
>>>>> Subject: [OpenSource_GPS] osgps run under windows xp
>>>>> To: [email protected]
>>>>> Message-ID: <[email protected]>
>>>>> Content-Type: text/plain; charset=3Dus-ascii
>>>>> =

>>>>> Hi, Cliff:
>>>>> =

>>>>> =

>>>>> I purchased a GPS1005  PCI bus board on year 2007 from GPS Creations.=
 Now we =

>>>>> want to run it under windows xp.So we wonder if  the opensource_gps c=
ode can =

>>>>> run in windows xp and if there is a windows WDM driver available. =

>>>>> =

>>>>> Could you please advise how could I proceed in order to find
>>>>> such driver? Do you know anyone else who could have it available?
>>>>> =

>>>>> Sincerely,
>>>>> =

>>>>> yuguang.
>>>>> =

>>>>> =

>>>>> =

>>>>> =

>>>>> =

>>>>> ------------------------------
>>>>> =

>>>>> _______________________________________________
>>>>> opensource_gps mailing list
>>>>> [email protected]
>>>>> http://lists.psas.pdx.edu/cgi-bin/mailman/listinfo/opensource_gps
>>>>> =

>>>>> =

>>>>> End of opensource_gps Digest, Vol 49, Issue 1
>>>>> *********************************************
>>>> =

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>>>> =

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