will anyone help me delete the first 15 min of a static file

Email me the rinex or dat file.
[email protected]

Sent email

send it here if you still need it, I can help you

If you're into GPS I recomend you download Ultraedit. Saved my azz many a time.

WordPad Works For Simple Deletions.

A RINEX is a simple text file, and WordPad is a text file editor.

I use it all the time to look at my files and most often may delete a few niutes with it.

I use teqc or decimate to reduce file size by going to 30 second data.

teqc is a free download so there is no reason that you should not have it.

Paul in PA

LPL

> A RINEX is a simple text file, and WordPad is a text file editor.
>
> I use it all the time to look at my files and most often may delete a few niutes with it.
>
> I use teqc or decimate to reduce file size by going to 30 second data.
>
> teqc is a free download so there is no reason that you should not have it.
>
> Paul in PA

How many pages is 15 minutes?

WordPad Works For Simple Deletions.

Results using text editor (Topcon receiver/ not sure the antenna type/ HI shows as 0.00...). I selected the Topcon HiperLite, but you may need to update since the Rinex showed me this:
2.10 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE
TPS2RIN 7.12 22-SEP-14 09:09 PGM / RUN BY / DATE
build Jan 23 2008 (c) Topcon Positioning Systems COMMENT
C:UsersclarkeDesktoptpslog0918x.tps COMMENT
log0918x_J2TC MARKER NAME
Observer Agency OBSERVER / AGENCY
8PDSKNFJ2TC TPS HIPER 3.5 Mar,16,2011 p1 REC # / TYPE / VERS
000 -Unknown- ANT # / TYPE
-68794.5009 -5350495.1596 3459413.0955 APPROX POSITION XYZ
0.0000 0.0000 0.0000 ANTENNA: DELTA H/E/N
1 1 WAVELENGTH FACT L1/2
2014 9 18 23 2 5.0000000 GPS TIME OF FIRST OBS
2014 9 19 1 47 10.0000000 GPS TIME OF LAST OBS

User is aware of the receiver type and antenna height, but received the following results (Epochs at 5-sec intervals):

Minus the first 15 minutes:
FILE: minus15.14o OP1411442439923

1008 NOTE: Antenna offsets supplied by the user were zero. Coordinates
1008 returned will be for the antenna reference point (ARP).
1008
NGS OPUS SOLUTION REPORT
========================

All computed coordinate accuracies are listed as peak-to-peak values.
For additional information: http://www.ngs.noaa.gov/OPUS/about.jsp#accuracy

USER: DATE: September 23, 2014
RINEX FILE: minu261x.14o TIME: 03:21:29 UTC

SOFTWARE: page5 1209.04 master53.pl 022814 START: 2014/09/18 23:17:00
EPHEMERIS: igr18104.eph [rapid] STOP: 2014/09/19 01:47:00
NAV FILE: brdc2610.14n OBS USED: 5372 / 5600 : 96%
ANT NAME: TPSHIPER_LITE NONE # FIXED AMB: 29 / 37 : 78%
ARP HEIGHT: 0.000 OVERALL RMS: 0.021(m)

REF FRAME: NAD_83(2011)(EPOCH:2010.0000) IGS08 (EPOCH:2014.7151)

X: -68793.914(m) 0.042(m) -68794.704(m) 0.042(m)
Y: -5350494.527(m) 0.053(m) -5350493.068(m) 0.053(m)
Z: 3459411.693(m) 0.045(m) 3459411.537(m) 0.045(m)

LAT: 33 3 30.99963 0.014(m) 33 3 31.02104 0.014(m)
E LON: 269 15 48.09905 0.043(m) 269 15 48.06788 0.043(m)
W LON: 90 44 11.90095 0.043(m) 90 44 11.93212 0.043(m)
EL HGT: 6.037(m) 0.064(m) 4.737(m) 0.064(m)
ORTHO HGT: 32.324(m) 0.110(m) [NAVD88 (Computed using GEOID12A)]

UTM COORDINATES STATE PLANE COORDINATES
UTM (Zone 15) SPC (2302 MS W)
Northing (Y) [meters] 3660062.123 394611.602
Easting (X) [meters] 711316.260 662336.471
Convergence [degrees] 1.23511351 -0.22000457
Point Scale 1.00015061 0.99996748
Combined Factor 1.00014966 0.99996653

US NATIONAL GRID DESIGNATOR: 15SYS1131660062(NAD 83)

BASE STATIONS USED
PID DESIGNATION LATITUDE LONGITUDE DISTANCE(m)
DJ3659 MSB6 BOBO 6 CORS ARP N340651.355 W0904124.948 117165.6
DO9482 MSGN GREENVILLE CORS ARP N332019.304 W0910227.437 42072.6
DF7069 1ULM U OF LA AT MONROE CORS ARP N323144.501 W0920433.234 138511.7

NEAREST NGS PUBLISHED CONTROL POINT
DK1875 FURR N330337.055 W0904522.742 1845.4

This position and the above vector components were computed without any
knowledge by the National Geodetic Survey regarding the equipment or
field operating procedures used.

Using the first half of the file (OPUS-RS):
FILE: firsthalf.14o OP1411442463470

1008 NOTE: Antenna offsets supplied by the user were zero. Coordinates
1008 returned will be for the antenna reference point (ARP).
1008
NGS OPUS-RS SOLUTION REPORT
========================

All computed coordinate accuracies are listed as 1-sigma RMS values.
For additional information: http://www.ngs.noaa.gov/OPUS/about.jsp#accuracy

USER: DATE: September 23, 2014
RINEX FILE: firs261x.14o TIME: 03:25:32 UTC

SOFTWARE: rsgps 1.37 RS54.prl 1.99.2 START: 2014/09/18 23:02:05
EPHEMERIS: igr18104.eph [rapid] STOP: 2014/09/19 00:20:35
NAV FILE: brdc2610.14n OBS USED: 5968 / 6168 : 97%
ANT NAME: TPSHIPER_LITE NONE QUALITY IND. 6.11/ 30.34
ARP HEIGHT: 0.000 NORMALIZED RMS: 0.432

REF FRAME: NAD_83(2011)(EPOCH:2010.0000) IGS08 (EPOCH:2014.71503)

X: -68793.947(m) 0.005(m) -68794.737(m) 0.005(m)
Y: -5350494.501(m) 0.024(m) -5350493.042(m) 0.024(m)
Z: 3459411.675(m) 0.016(m) 3459411.519(m) 0.016(m)

LAT: 33 3 30.99960 0.006(m) 33 3 31.02101 0.006(m)
E LON: 269 15 48.09777 0.005(m) 269 15 48.06660 0.005(m)
W LON: 90 44 11.90223 0.005(m) 90 44 11.93340 0.005(m)
EL HGT: 6.005(m) 0.028(m) 4.706(m) 0.028(m)
ORTHO HGT: 32.292(m) 0.034(m) [NAVD88 (Computed using GEOID12A)]

UTM COORDINATES STATE PLANE COORDINATES
UTM (Zone 15) SPC (2302 MS W)
Northing (Y) [meters] 3660062.121 394611.601
Easting (X) [meters] 711316.227 662336.438
Convergence [degrees] 1.23511332 -0.22000476
Point Scale 1.00015061 0.99996748
Combined Factor 1.00014967 0.99996654

Using the last half of the file (OPUS-RS):

FILE: lasthalf.14o OP1411442477062

1008 NOTE: Antenna offsets supplied by the user were zero. Coordinates
1008 returned will be for the antenna reference point (ARP).
1008
NGS OPUS-RS SOLUTION REPORT
========================

All computed coordinate accuracies are listed as 1-sigma RMS values.
For additional information: http://www.ngs.noaa.gov/OPUS/about.jsp#accuracy

USER: DATE: September 23, 2014
RINEX FILE: last262a.14o TIME: 03:32:58 UTC

SOFTWARE: rsgps 1.37 RS52.prl 1.99.2 START: 2014/09/19 00:20:30
EPHEMERIS: igr18105.eph [rapid] STOP: 2014/09/19 01:47:10
NAV FILE: brdc2620.14n OBS USED: 6951 / 7007 : 99%
ANT NAME: TPSHIPER_LITE NONE QUALITY IND. 3.69/ 42.80
ARP HEIGHT: 0.000 NORMALIZED RMS: 0.408

REF FRAME: NAD_83(2011)(EPOCH:2010.0000) IGS08 (EPOCH:2014.71519)

X: -68793.936(m) 0.003(m) -68794.726(m) 0.003(m)
Y: -5350494.540(m) 0.020(m) -5350493.081(m) 0.020(m)
Z: 3459411.690(m) 0.009(m) 3459411.534(m) 0.009(m)

LAT: 33 3 30.99932 0.007(m) 33 3 31.02073 0.007(m)
E LON: 269 15 48.09821 0.003(m) 269 15 48.06704 0.003(m)
W LON: 90 44 11.90179 0.003(m) 90 44 11.93296 0.003(m)
EL HGT: 6.046(m) 0.021(m) 4.747(m) 0.021(m)
ORTHO HGT: 32.333(m) 0.028(m) [NAVD88 (Computed using GEOID12A)]

UTM COORDINATES STATE PLANE COORDINATES
UTM (Zone 15) SPC (2302 MS W)
Northing (Y) [meters] 3660062.112 394611.592
Easting (X) [meters] 711316.238 662336.449
Convergence [degrees] 1.23511338 -0.22000470
Point Scale 1.00015061 0.99996748
Combined Factor 1.00014966 0.99996653

One Page Ralph

Data files have no strict concept of pages. Data has to be formatted to fit on the screen or the page. There are some text editors that will number the lines.

Each epoch of a PRN observation is considered only one line, however it may take 3 printed (screen) lines to display that one line of data (up to eleven observables). After 5 observables there is a line return. RINEX rules tell the software processor how many observables are available and he software goes to the next line after reading the 5 observables per line limit. The fact that eleven observables are available does not mean there will be actual data in the eleven data positions, some positions may be blank.

Depending on the number of satellites a printed page may include two to three epochs of observations.

You can parse a RINEX file by decimating from 1 or 5 seconds to 30 seconds and greatly reduce the data. One can further reduce file space by parsing to the 4 basic observables; L1, C1 or P1, L2 & P2. To do that it may also be necessary to merge the new C2 observations to fill in the P2 column.

A page or screen is just presentation. I recall that when I was at Bethlehem Steel I opened one of my data files on a monitor. I saw only 3 lines and thought some data was missing. I decided to scroll to the right to see how long a line was. At 26,000 characters right, the third line dropped out and I decided I would not scroll to the end. Now that I think about it I should have dropped down to the second line and scrolled left, which may or my not have worked.

Paul in PA