Introduction to GPS: Theory and Applications



Homework No. 3

GS 608: Introduction to GPS: Theory and Applications

Autumn 2000

Assigned: November 1, 2001

Due: November 15, 2001

1. Using the enclosed handout ‘Trimble Geomatics Office Data Processing’ and instructions given to you in class use the Trimble Geomatics Office software to process the GPS data collected last week. The files are provided to you in RINEX format.

• Use the static data set collected with Trimble 4000SSI receivers where base station is park2980.01o (park2980.01n), and rover is 51382980.01o (51382980.01n). These files are available on the class web under Homework page. Note that Park is the base station and its coordinates are provided below.

• The antenna heights are: 1.427 m to the bottom of the antenna mount at the base station and 1.454 m to the bottom of the antenna mount at the rover. The antenna types are “4000SSE/SST L1/L2 Geodetic” for both.

• Use the differential processing mode: select the “L1 fixed” (performing a fixed integers solution) for your data processing; save your results.

• Now, select the “Codes” (performing a codes only solution) solution for your data processing and save the results

2. After the data processing has been completed, create a full Project Report (follow the enclosed instructions) including plots of residuals, satellite tracking summary at stations and single-differenced summary etc.

• Discuss your results and enclose the printout of the Report for all the solution types that you performed

• Comment on the differences between the two different types of solutions.

3. Perform the coordinate conversion between the SPSC 1983 (N/E/H/h), which is your primary output reference system, with WGS 84 (lat/lon/h) solution for the L1-fixed solution and save it in your local directory. Here are the steps.

- Press Select All in Geomatics Office

- Press File/Export and then choose Custom tag.

- Select Name/Latitude/Longitude/Height (WGS84 decimal degrees)

- Press Ok and give the export file name. These exported files can be found in Export sub directory in your project directory.

- Provide printouts of your results.

4. Repeat step 1 but only for “L1 fixed” solution, using the static data collected by Trimble 4600 receiver. The objective is to determine the ancillary base station, named 4366, occupied by 4600 receiver. The Rinex file names available on the class web page are: park2980.01o (park2980.01n) and 43662982.99o (43662982.99n). Your reference base station is Park as in step 1. Antenna height measured at 4366 was 1.447 m to the bottom of the antenna mount and its antenna type was “4600 LS Internal”. Note, as for Park, you need to use the same antenna height and type as you did in 1.

5. Using the data collected with Trimble 4600 receiver in a fast static mode process the data, with respect to a static location of another Trimble 4600 (ancillary base: 43662982.99o and 43662982.99n) estimated in step 4 above. The files for the rover on the web are 45732981.01o (45732981.01n). The antenna height and type at 4600 rover were 1.808 m and “4600 LS Internal”.

Now, repeat your computation using the original base station (Trimble 4000SSI receiver)., whose file is park2980.01o (park2980.01n). Compare your results.

Trimble Geomatics Office Data Processing

Create a project

• Start Trimble Geomatics Office

• Choose New Project and enter the project name. Choose Sample Data as the Template.

• Hit Folder and specify your local disk. This is where you are going to store all of your data and the results.

• In Network Adjustment Style, select Trimble Default though we are not going to use network adjustment in this assignment.

• Verify Project Property. Please do the following

- In Project Details tag, put your name in Computer Operator.

- In Coordinate System tag, change it to US SPSC 1983, Ohio South 3402, NAD 83, GEOID 99. Put 100.0 m as default elevation.

Load GPS data

• Download files from the class web save it to your local disk.

• Back to Trimble Geomatics Office. Hit File/Import/RINEX files

• Select the file you downloaded.

• Verify the station name, start time, end time, antenna height and antenna type. Hit OK when the data is loaded.

• Hit View/Point Labels, select Name. Zoom or Pan if needed.

Verify coordinates of the base station

• Park is the designated base station whose coordinates are: N = 222116.000 m, E = 553811.275, Elevation = 239.601.

• Select Park and right-click it. Choose Properties and select Edit.

• Input the coordinates of Park as: Leave Height blank. By doing this, we are assuming its coordinates are precisely known.

• Close Properties window.

Process Data

• Hit Survey/GPS Processing Styles. Choose Edit afterward.

• Select the desired Solution Type: Code or Fixed

• Hit Select All

• Hit Survey/Process GPS baselines. Hit Save when the process is done.

• Click on the baseline. Right-click it and select Properties. What message did you get? Check you RMS. Is it very large?

Project report

• Select one base line on the screen by clicking onto it.

• Hit Reports/GPS baselines processing report.

• Print it out as part of your homework 3 report.

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