[OpenSource_GPS] About pull_in state Parameter
姜毅
jiangyigirl at yahoo.com.cn
Thu May 15 02:58:40 PDT 2008
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 send me something about the simulation?
Thanks.
Looking forward for your reply.
Best regards
Yours,
Jiang Yi
----- Original Message -----
From: "Clifford Kelley" <cwkelley at earthlink.net>
To: "??" <jiangyigirl at yahoo.com.cn>
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 then divided by 10.
>
> 1200 was chosen as an approximate value of 45 deg based on the scaling used in the 4 quadrant arc tangent function.
>
> I hope this helps,
>
> Cliff
>
> -----Original Message-----
>>From: ?? <jiangyigirl at yahoo.com.cn>
>>Sent: May 8, 2008 7:41 PM
>>To: opensource_gps at lists.psas.pdx.edu
>>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: <opensource_gps-request at lists.psas.pdx.edu>
>>To: <opensource_gps at lists.psas.pdx.edu>
>>Sent: Friday, May 09, 2008 3:00 AM
>>Subject: opensource_gps Digest, Vol 49, Issue 2
>>
>>
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>>> 2. Re: Why add 0.5 in pull_in and track parameter (??)
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>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Wed, 7 May 2008 12:00:42 -0700
>>> From: <shuaihan at live.com>
>>> Subject: [OpenSource_GPS] ????
>>> To: opensource_gps at lists.psas.pdx.edu
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>>> Message: 2
>>> Date: Thu, 8 May 2008 09:55:09 +0800
>>> From: "??" <jiangyigirl at yahoo.com.cn>
>>> Subject: Re: [OpenSource_GPS] Why add 0.5 in pull_in and track
>>> parameter
>>> To: <opensource_gps at lists.psas.pdx.edu>
>>> Message-ID: <000b01c8b0ae$8e56a420$7001a8c0 at dlmu7657b7f615>
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>>> Dear Sir:
>>>
>>> I found Open Source software is :
>>>
>>> pull_carr_C1=(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=(int) (0.6369183/Carrier_DCO_Delta*(1.8856*Bnpullcarr/1000.0)*(1.8856*Bnpullcarr/1000.0)*1000.0/
>>> (4.0+5.333*Bnpullcarr/1000.0+(1.8856*Bnpullcarr/1000.0)*(1.8856*Bnpullcarr/1000.0))+0.5);
>>>
>>> pull_code_C1=(int) (10.598/Code_DCO_Delta*Bnpullcode/(4.0+5.333*Bnpullcode/1000.0+(1.8856*Bnpullcode/1000.0)*
>>> (1.8856*Bnpullcode/1000.0))+0.5);
>>>
>>> pull_code_C2=(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*Bnpullcode/1000.0))+0.5);
>>>
>>> I know C1 C2 is
>>> pull_carr_C1 = 1/(Ko*Kn)*8*zeta*On*Ts/(4+4*zeta*On*Ts+(On*Ts)^2);
>>> pull_carr_C2 = 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: <opensource_gps-request at lists.psas.pdx.edu>
>>> To: <opensource_gps at lists.psas.pdx.edu>
>>> Sent: Thursday, May 08, 2008 3:00 AM
>>> Subject: opensource_gps Digest, Vol 49, Issue 1
>>>
>>>
>>>> Send opensource_gps mailing list submissions to
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>>>> or, via email, send a message with subject or body 'help' to
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>>>> Today's Topics:
>>>>
>>>> 1. osgps run under windows xp (yuguangzhan)
>>>>
>>>>
>>>> ----------------------------------------------------------------------
>>>>
>>>> Message: 1
>>>> Date: Wed, 7 May 2008 12:05:10 +0000 (UTC)
>>>> From: yuguangzhan <yuguang.zhan at 163.com>
>>>> Subject: [OpenSource_GPS] osgps run under windows xp
>>>> To: opensource_gps at lists.psas.pdx.edu
>>>> Message-ID: <loom.20080507T120323-538 at post.gmane.org>
>>>> Content-Type: text/plain; charset=us-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 code 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.
>>>>
>>>>
>>>>
>>>>
>>>>
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