Re: opensource_gps Digest, Vol 48, Issue 4

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!


                                                                                                    JiangYi
                       
----- Original Message ----- 
From: <[email protected]>
To: <[email protected]>
Sent: Thursday, April 24, 2008 3:00 AM
Subject: opensource_gps Digest, Vol 48, Issue 4


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> Today's Topics:
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>   1. Re: SoftOSGPS (Hua Wei)
>   2. Details on GPS Creations' GPS1A receiver (Andrew Greenberg)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 23 Apr 2008 11:35:25 +0800
> From: "Hua Wei" <[email protected]>
> Subject: Re: [OpenSource_GPS] SoftOSGPS
> To: "Clifford Kelley" <[email protected]>
> Cc: [email protected]
> Message-ID:
> <[email protected]>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hi, Cliff:
> 
> Did the   SoftOSGPS.c (V1.0)  missed the folllowing  part for the cold start
> and warm start   in the  "while (!feof(ifdata))"   loop ??
> 
> 
> /* channel allocation once every minute */
>      if (min_flag == 1)
>        {
>          if (status != cold_start)
>            chan_allocate ();
>          else if (status == cold_start)
>            cold_allocate ();
>          min_flag = 0;
>   clear_screen ();
>        }
> 
> Otherwise, it cannot assign the correct channel.
> 
> Hope to get  your response soon.
> 
> -- 
> Best Regards
> Hua Wei
> ================================
> Tel: 15800325131
> Email:  [email protected]
> Homepage: Http://www.geocities.com/weihua7575/<http://www.geocities.com/weihua7575/>
> ====================================
> 
> On 4/10/08, Clifford Kelley <[email protected]> wrote:
>>
>> All,
>>
>> The 1.0 release of SoftOSGPS for the GPS1A is now available on
>> Sourceforge.
>>
>> Currently it is hardcoded to process the gnss_6_5_2007.bin file but soon
>> we'll have it read the input file name and other needed parameters from a
>> file.
>>
>> If you get a chance please check out the OSGPS Wiki.  I'd like to use it
>> for announcements/discussions etc.
>>
>>
>> Best regards,
>>
>> Cliff
>>
>> _______________________________________________
>> opensource_gps mailing list
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> 
> 
> 
> -- 
> Best Regards
> Hua Wei
> ================================
> Tel: 15800325131
> Email:  [email protected]
> Homepage: Http://www.geocities.com/weihua7575/<http://www.geocities.com/weihua7575/>
> ================================
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> ------------------------------
> 
> Message: 2
> Date: Wed, 23 Apr 2008 07:42:35 -0700
> From: Andrew Greenberg <[email protected]>
> Subject: [OpenSource_GPS] Details on GPS Creations' GPS1A receiver
> To: OpenSource GPS List <[email protected]>
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Hi everyone!
> 
> Cliff, you posted the raw data file from the GPS Creation's new USB 
> board. Thanks a ton for that, we're going to use it for a bunch of 
> projects, including mucking about with SoftOSGPS. We have a few questions:
> 
> 1. Is there a real data sheet on the SiGe chip somewhere? We can't seem 
> to find it.
> 
> 2. What is the sample rate of the GPS1A? And what is the data format of 
> the file itself?
> 
> Thanks,
> 
> Andrew
> 
> -- 
> -------------------------------------------------------
> Andrew Greenberg
> 
> Portland State Aerospace Society (http://psas.pdx.edu/)
> [email protected]  P: 503.788.1343  C: 503.708.7711
> -------------------------------------------------------
> 
> 
> 
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