[teqc] Does SNV message must be the 1st record at the beginning of
raw data file
Jerry Leo
jerry_leo at msn.com
Wed Feb 22 08:06:52 MST 2006
Hi,
My PC is connected to GPS recevier directly. On a FC 3 box, I made a
PERL script to log the real time output from the ASHTECH Z-Surveyor
receiver in 1-hour segments. I have enabled the output of raw data
messages CBEN, DBEN, MBN, PBN and SNV. Except the first 1-hour
segments, C1, D1 and D2 code are missing after the 1-hour segments is
translated to RINEX file using TEQC, only there are L1, L2, P1 and P2
four observation types.
For example, Logging script launches at 03:10, the first 1-hour segments
will be created at 04:00, it has L1, L2, C1, P1, P2, D1 and D2 seven
observation types after translating to RINEX format using TEQC. The
second 1-hour segments will be created at 05:00, but it only has L1, L2,
P1 and P2 four observation types after translating to RINEX format using
TEQC, C1, D1 and D2 code are missing. In the header section, there is a
comment "note: cannot distinguish between L1(CA)=C1 and L1(P1)=P1".
And same to the next 1-hour segments.
I checked all of the raw data files and found that the 1st records at the
beginning of the raw data file wasn't SNV message except the 1st 1-hour
segments. So I made a test, edited one of the raw data files and removed
records before SNV message at the begin of the file. Now there is no a
comment "note: cannot distinguish between L1(CA)=C1 and L1(P1)=P1"
in the header. But I found another thing. In the O-file, only the 1st
section
has seven observation types, for the other secionts, there are only four
observation types.
I'd like to make real-time estimation of atmospheric water vapor. So I have
several questons,
1. What's the side effect for me if the 1st record at the beginning of raw
data file isn't SNV messages?
2. What's the meaning for "cannot distinguish between L1(CA)=C1 and
L1(P1)=P1"?
3. Should I have to make sure that the 1st record at the beginning of raw
data file must be SNV message?
4. Why only the 1st section has seven observation types and the other
sections only have four observation types in the O-file?
Here are the examples of output
***Without removing records before SNV message at the begin of the file***
4 L1 L2 P1 P2 # / TYPES OF
OBSERV
pseudorange smoothing corrections applied COMMENT
note: cannot distinguish between L1(CA)=C1 and L1(P1)=P1 COMMENT
2006 2 9 5 0 0.0000000 GPS TIME OF FIRST
OBS
END OF HEADER
06 2 9 5 0 0.0000000 0 8G 2G 4G 7G 9G17G20G24G28
-14074617.092 -10957346.555 22115608.623 22115609.582
-17245640.134 -13393620.998 20628209.957 20628212.476
-7390880.399 -5753189.011 23264276.796 23264280.903
369532.666 353662.009 24305556.373 24305560.391
-7883030.249 -6111737.607 21617091.479 21617093.518
6144721.569 4810102.073 24836279.921 24836282.799
-4825223.234 -3720398.506 22302789.230 22302792.168
-4762025.777 -3693852.186 21996290.115 21996292.783
06 2 9 5 0 30.0000000 0 8G24G17G 7G 4G20G 2G28G 9
-4731289.12943 -3647203.13442 22020871.5104 22020874.8984
-7851435.99943 -6087118.73942 21323311.4304 21323313.1974
-7429922.28243 -5783611.24942 22957054.2264 22957057.9414
-17215560.83643 -13370182.60142 20334141.5914 20334143.9464
6251452.37943 4893268.88942 24556797.1694 24556800.7914
-14106598.10643 -10982266.81042 21809730.1454 21809731.1284
-4661263.89643 -3615336.50342 21715671.8804 21715674.4244
406916.57543 382792.23542 24012878.0344 24012882.1204
*** After removing records before SNV message at the begin of the file***
7 L1 L2 C1 P2 P1 D1 D2 # / TYPES OF
OBSERV
SNR is mapped to RINEX snr flag value [1-9] COMMENT
L1: 1 -> 1; 90 -> 5; 210 -> 9 COMMENT
L2: 1 -> 1; 150 -> 5; 250 -> 9 COMMENT
pseudorange smoothing corrections applied COMMENT
2006 2 9 5 0 30.0000000 GPS TIME OF FIRST
OBS
END OF HEADER
06 2 9 5 0 30.0000000 0 8G24G17G 7G 4G20G 2G28G 9
-4731289.12943 -3647203.13442 22020871.0174 22020874.8984
22020871.5104
-3133.5194 -2441.7144
-7851435.99943 -6087118.73942 21323310.5114 21323313.1974
21323311.4304
-1056.4644 -823.2214
-7429922.28243 -5783611.24942 22957053.8614 22957057.9414
22957054.2264
1301.1684 1013.8944
-17215560.83643 -13370182.60142 20334140.5014 20334143.9464
20334141.5914
-1009.5124 -786.6294
6251452.37943 4893268.88942 24556796.5634 24556800.7914
24556797.1694
-3563.3564 -2776.6454
-14106598.10643 -10982266.81042 21809729.5924 21809731.1284
21809730.1454
1059.9954 825.9654
-4661263.89643 -3615336.50342 21715671.4504 21715674.4244
21715671.8804
-3365.8854 -2622.7584
406916.57543 382792.23542 24012877.1464 24012882.1204
24012878.0344
-1254.1364 -977.2544
06 2 9 5 0 30.0000000 0 8G 2G 4G 7G 9G17G20G24G28
-14106598.128 -10982266.810 21809730.198 21809731.097
-17215560.862 -13370182.600 20334141.617 20334143.955
-7429922.302 -5783611.249 22957052.393 22957057.760
406916.547 382792.235 24012878.200 24012882.967
-7851436.016 -6087118.739 21323311.479 21323313.038
6251452.353 4893268.889 24556797.233 24556799.811
-4731289.148 -3647203.133 22020871.538 22020874.806
-4661263.918 -3615336.503 21715671.903 21715674.691
Thanks
Jerry
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