gps tools chapter 2

GEOMATICS ENGINEERING DEPARTMENT – CIVIL AND PLANNING FACULTY of INSTITUTE TECHNOLOGY SEPULUH NOPEMBER SURABAYA 2014

1. ZULFIKAR ADLAN NADZIR 35111000272. AKHMAD ARISANDY 3512100026 3. ELIYA NUR FADILA 35121000404. YUGIE NANDA PRANATA 35121000675. UMROH DIAN S. 35121000716. MUSDIYANA THALIF 3512100104

GPSTOOLS TUTORIAL2nd Chapter:

Analytical and Download Observation Point Coordinates by 2 Static PPP (Precise Point Positioning)

Analysis of the observation point coordinates by static PPP (Precise

Point Positioning) Method

In this Example, we will analyze the position using PPP Method and

below is the main analysis condition.

a. Observation points object at IGS (International GNNS Service)

BAKO (Cibinong)

b. Date 2014/1/1 0:00-10/1 23:55 GPST (GPS Time).

c. Time interval 24 H; 300 sec.

d. Satellite orbit/ clock/ ERP (Earth Rotation Parameters): IGS Final.

e. Tropospheric delay: ZTD / Gradient estimation + NMF.

f. Lowest elevation : 10 degrees.




So following this section:

1. Press “Estimate” button on the Main Menu. The “Observation data Edit/ Parameter

estimator” window will appears (referred to as parameter estimation screen below)

constant/ execution screen (Figure 2-1)




After that, do the following:

2. Set PPP parameter for sample analysis: Click file and Run the "Load Setting .." menu. In

the “file” selection dialog choose prm_ppp_300s_static.mat file.

3. Press the "Open" button to select the file. Static PPP for sample analysis parameters

4. It will be loaded automatically.




Then:

5. Enter the observation point to be used for the analysis on receiver list on parameter

estimation screen “Receivers”. This time, we are using “BAKO”

6. Then you can make setting for output data directory on clean observation data of

parameter estimation screen.




7. Set the Raw Observation Data, Navigation Messages, Satellite Ephemeris,

Satellite/Receiver Clock and Earth Rotation Parameters using “Data Directories/Files”

Button.


8. After that, Try to Edit the Data first using

following parameters:

Exec Obs Data Editor : ON

Exec Parameter Estimator: ON

Raw Observation Data : RINEX

Navigation Messages : Combined



9. For the RINEX Observation Data and Navigation Messages Name Format, it should

comply the table below:


10. Run the Process by Pressing “Execute” Button. The progress will displayed, and if the

“Completed” Status is displayed, then your process was finished properly.



9. Press “Log” button after the Analysis is Complete, to see the statistics and analysis of

Cycle Slip, Cycle Statistics, or Outliers of the observations.

10. Press “Plot” then pick “Observation Data” to plotting the edited Observations Data




11. We can do Individual Plotting of Every Observation Data by Double Clicking the Plot,

to checking Cycle Slip, Start Time and End Time of Observations

12. Check the Observation Data Editing if you want to change another parameters or you

want to check what parameters to be changed.




11. Observation Data Editing is completed successfully, then you can do parameter

estimation using “Est/Fixed Parameters” button


In the Window, you can choose the

parameters like this:

Satellite: ALL Receiver: ALL

Orbit: IGS Final Position: <estimated>

Clock: IGS Final Clock: <estimated>

SRP Param: (Blank) Tropos ZTD: <estimated>

ERP: IGS Final Phase Bias: (Blank)

Geocent (Blank)

Then, press OK



13. Execute the Process using Parameter below:

Exec Obs Data Editor: OFF

Exec Parameter Estimator: 2pass (FB)

Estimation Strategy : ZD/PPP

Receiver Clock Model : White Noise

Receiver Position Model : Static

14. After the Process is Completed, press “Log” to show the Log Anaylsis about the

process and make sure that no error are displayed.




15. We can display the Observation Data in Receiver Position Display using Menu Plot,

then choose Receiver Positions, and choose the data you want to show and process.

16. Check the Observation Data Editing if you want to change another parameters or you

want to check what parameters to be changed.




17. If you want to Plot the Observation Data in Map View, use Menu “Plot” then choose

“Horizontal Error Map” or “Vertical Error Map” if you want to show the Vertical Error

18. Then, you can save the coordinates output using “Data” menu, then choose “Output”.

This options enables you to save the coordinates into CSV Files.




19. We can plot the ZTD (Tropospheric Parameters) using Plot Menu, then choose the

Troposphere Parameters.

20. Then, we can show the Clock Bias in every Satellites or every Receiver.


Questions?

gps tools chapter 2

Engineering