[teqc] question on rinex file formatting...

Jeff Freymueller jeff.freymueller at gi.alaska.edu
Wed Sep 2 21:46:29 MDT 2009


Sridhar,

I think that is right. The Net-RS does not really observe P1. It  
observes C1 and P2-P1 (it's P2 is really C1 + (P2-P1)).

The P1 observable is normally restricted to those receivers that  
observe P1 directly, like the Ashtech Z-12 and any receivers that use  
similar methods.

I think the usual software packages expect this. If there is a  
problem, use teqc to remove P1. Becuase the P1 will all be blank  
anyway, you won't lose anything.

Jeff

On Sep 2, 2009, at 7:31 PM, Sridhar Anandakrishnan wrote:

> All, I must be missing something.  Here is the output of ``teqc -tr  
> d FILE.DAT > file.obs''
>
> This is a Trimble NetRS file converted to .DAT with the Trimble  
> utility.
>
> Here's my question:  The # / TYPES OF OBSERV lines is 7, L1, L2, C1,  
> P2, P1, S1, and S2
> but the observations are only 6 numbers.  Is one of the obs null?   
> Would that be P1?
>
>  -2012390.71947  -1554465.15246  22369201.6564   22369193.6644
>        47.7504         36.0004
>
> Thanks,
> Sridhar
>
>     2.11           OBSERVATION DATA    G (GPS)             RINEX  
> VERSION / TYPE
> teqc  2009Mar23                         20090903 03:23:42UTCPGM /  
> RUN BY / DATE
> OSX ker:9.6.0|G5|gcc 3.3|OSX ker:9.6.0+|G3+                 COMMENT
> BIT 2 OF LLI FLAGS DATA COLLECTED UNDER A/S CONDITION       COMMENT
> CREF0001                                                    MARKER  
> NAME
> 0001                                                        MARKER  
> NUMBER
> -Unknown-           -Unknown-                                
> OBSERVER / AGENCY
> 4435237649          TRIMBLE NETRS       1.1-2               REC # /  
> TYPE / VERS
> 00000000            TRM41249.00                             ANT # /  
> TYPE
>  1506677.2614 -1764342.7580  5922323.4166                  APPROX  
> POSITION XYZ
>        0.0533        0.0000        0.0000                  ANTENNA:  
> DELTA H/E/N
>     1     1                                                 
> WAVELENGTH FACT L1/2
>     7    L1    L2    C1    P2    P1    S1    S2            # / TYPES  
> OF OBSERV
>    15                                                      LEAP  
> SECONDS
> SNR is mapped to RINEX snr flag value [0-9]                COMMENT
>  L1 & L2: min(max(int(snr_dBHz/6), 0), 9)                  COMMENT
>  2009     6    17     0     0    0.0000000     GPS         TIME OF  
> FIRST OBS
>                                                            END OF  
> HEADER
> 09  6 17  0  0  0.0000000  0 12G25G 8G 6G15G 3G18G16G21G22G28G19G 7
>  -2012390.71947  -1554465.15246  22369201.6564   22369193.6644
>        47.7504         36.0004
> -13159696.77047 -10241289.26646  21994332.7814   21994325.5514
>        47.5004         36.5004
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Dr. Jeffrey T. Freymueller         Office: 907-474-7286
Geophysical Institute              Fax:    907-474-7290
University of Alaska, Fairbanks    Home:   907-479-3550
PO Box 757320                      Cell:   907-378-7556
Fairbanks, AK 99775-7320           email: jeff.freymueller at gi.alaska.edu
URL: http://www.gps.alaska.edu/jeff/jeff.html

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