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© US Positioning Group, LLC

All Rights Reserved

Rhino

®

is registered in the U.S. Patent and

Trademark Office

Copyright

i

Rhino Post-Processor

1. Welcome to Rhino Post-Processor.................................................. 1

a. Introduction...................................................................................2

2. Getting Started..................................................................................3

a. Supported Windows Desktop Platforms.................................. 4

b. Installing Rhino Post-Processor...................................................4

c. Rhino Post-Processor Licensing..................................................5

e. Getting Help and Support..........................................................6

3. Usinig Rhino Post-Processor............................................................. 7

a. Main Screen.................................................................................. 8

b. Post-Process a RINEX FIle............................................................ 9

c. Choosing Files for Post-Processing a RINEX File(s)................. 10-12

d. Post-Process a Shape File........................................................... 13

e. Choosing Files for Post-Processing a Shape File....................14

f. Type of Differentially Correcting and there Options............15

g. Filtering Options........................................................................... 16-17

h. Processing Your Data..................................................................18

i. Viewing Log Files......................................................................... 19

Table of Contents

ii

4. Contact Information.................................................................. 20

a.

Headquarters.......................................................................... 21

b. Help and Support................................................................... 21

Table of Contents

iii

Welcome to Rhino Post-Processor

Introduction

Rhino Post-Processor

The Rhino Post-Processor guides the user through the process of differentially

correcting differential GPS data that was recorded in the field. Rhino Post-

Processor requires that the input files of the rover, reference, and ephemeris to be

formatted in RINEX format.

Note: In order for Rhino Post-Processor to correct shape files, they must have been collected with Rhino Rover for
Arcpad.

2

Getting Started

Supported Windows Desktop Platforms

Windows XP

Windows 2000

Windows NT

Windows 98

Windows 95

Installing Rhino Post-Processor on a Desktop Windows machine

- Close all applications that are currently running on your PC.

- Insert the Rhino Post-Processor CD-ROM.

- Run “Setup.exe” from the CD-ROM.
- Follow the on-screen instructions to complete the setup process.

Getting Started

4

Getting Started

Note: When a valid key is entered, the following message will be displayed and the copy protection form will not be

shown again.

Rhino Post-Processor Licensing

If a valid license is not found on your computer, you will need to license your ver-

sion of Rhino Post-Processor before you can begin

differentially correcting posi-

tions.

Contact US Positioning with your Device ID and you will be provided an

Unlock Key. Enter your Unlock Key into the text box and press the Unlock button.

If an invalid key is entered, a message box will appear and request that you call

US Positioning.

5

Getting Started

Getting help and support

US Positioning Home Page

www.uspositioning.com

Software Demos & Product Literature

www.RhinoGPS.com

Support by e-mail

[e-mail]

Information by e-mail

[e-mail]

Phone Numbers

800.6 G P S L O G or

480.988.1000

6

Using Rhino Post-Processor

Using Rhino Post-Processor

Rhino Post-Processor Main Screen

Once you accept the license agreement, Rhino Post-Processing’s Main screen will

appear. The figure below shows the main screen and defines the controls and

displays available on it. The usage and application of these controls will be

explained in the following sections of this user manual.

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Using Rhino Post-Procesor

Post-Process a RINEX File

The Post-Process a RINEX File form looks like the figure bellow. Here you will be

able to choose your Rover, Reference and Ephemeris files needed for post-pro-

cessing. You will also be able to choose the type of differentially correcting you

will be using whether it be Pseudorange or Carrier Phase. Filtering options such as

Masking Angles, SNR Thresholds, and processing intervals can also be set or ma-
nipulated on this screen.

Note: The Rover, Reference and Ephemeris file must be supplied in RINEX format. Most RINEX Rover and

Reference files usually have the filename extension in the form “yyO”, where “yy” represents the last two digits of

the year, and “ o” is used to denote an “Obersvation” data file. While the Ephemeris filename extension are in

the form of “yyN” where the “N” denotes a Navigation data file. Rhino Post-Processor will also accept .SP3 precise

ephemeris files.

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Using Rhino Post-Processor

The figure to the left shows where you

can add, remove or remove all RINEX

files in the current list.

Note: You can Select more than one RINEX file to post-process, but keep in mind that the more files you choose the
longer it will take to get the results.

To add RINEX files to be post-processed

press the “

” button and the

following screen will appear.

Use this to

locate and open the desired Rover file(s).

Choosing Files for Post-Processing a RINEX File(s)

10

Choosing Rover file(s) is done here. Rover file(s) are collected out in the field on a

Pocket PC an

d are then opened using a Post-Processor. The figure below show how to

open, or remove Rover file(s).

Using Rhino Post-Processor

Here you will be able to add a

Reference file or view its details.

To add a Reference file to be post-processed

press the “

” button and the screen on

on the right will appear.

Use this to locate and

open the Reference file

.

To view the details of a Reference files press the
“

” button. The screen to the left will then

appear. Here you will be able to enter the exact

antenna height and coordinates of your

reference station.

Note: once you change the coordinates to this file, the program will

save the changes that you made. The next time that you use this file

the changes will be the same.

Choosing Files for Post-Processing a RINEX File(s)

To differentially correct GPS data, you will need a reference file. This file is

collected with a GPS receiver that was located on a known position.

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Using Rhino Post-Processor

To post-process GPS data, you will need an ephemeris file. The ephemeris file

contains the information required to compute the coordinates of the GPS satellites

whenever a pseudorange or carrier phase measurement is being processed.

To add an Ephemeris file “

” button and

the screen to the right will appear.

Use this to

locate and open the ephemeris file

.

Choosing Files for Post-Processing a RINEX File(s)

12

Using Rhino Post-Processor

Post-Process a Shape File

The Post-Process a Shape File form looks like the figure directly below. Here you

will be able to choose your Shape file, Reference file and Ephemeris files to use for

processing. You may also choose the type of differentially correcting

whether it be Pseudorange or Carrier Phase. It also has an advanced but

ton

which will show the different filtering optionsthat are available.

When you press the “Advanced” button, the form will extend and reveal the filter

options. This is where you can adjust the Processing Interval, Masking Angle and

the Signal-to-Noise threshold (SNR). The figure below shows what the form looks

like when the advanced options are shown. To Change back to the way the

form was simply press the “Normal” Button.

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Using Rhino Post-Processor

Choosing Files for Post-Processing a Shape File

To add a shape file, reference file, or emphemeris file, press browse button witch
looks like the image here.

This will allow you to locate and open the files that

you need. Next to the reference file browse button is a show details button. This
looks like the image here

. It will allow you to change your reference station

coordinates and antenna height values.

Note: Remember that if the data files of the Rover, Reference and Emphemeris do not overlap you will not be able

to Post-Process and an error message will be shown which states that there is no common data. See the figure

below for an example.

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Using Rhino Post-Processor

Type of Differentially Correcting and There Options

Pseudorange Smoothing Options

You can choose to use the carrier phase data in the roving and/or reference

receiver data files to smooth the pseudorange data. Although the phase

measurements cannot give an indication of the true distance between the

satellite and the receiver, phase smoothing uses the principle that changes in

carrier phase measurements from one epoch to the next can give a more precise

indication of the changing distance than the pseudoranges do. They can

therefore be used to smooth the pseudoranges. The result is a smoother post-

processed track.

Cycle Slip Detection Threshold

Rhino Post-Processor has an option to select a threshold for the detection of cycle

slips. The default is set at zero. This forces the Post-Processor to identify and solve

for any cycle slips. If your data set has a lot of cycle slips, you may wish to try a

higher threshold initially, so that only the gross slips are

corrected.

Pseudorange Selected

Carrier Phase Selected

15

Using Rhino Post-Processor

Filtering Options

Processing Interval:

This option allows you to specify the interval between the processed epochs. For

instance, a RINEX data file with observations every second could be processed to

give a solution every 30 seconds. The intervening epochs would simply be ignored,

they would not contribute in any way to the solutions at the 30-second intervals.

Note: The processing interval cannot be shorter than the natural data interval of either the roving or reference
receivers.

Masking Angle:

This frame allows you to select an elevation mask angle (in degrees), so that

observed satellites below this angle are not used in the solution. This is useful to

exclude satellites which are close to the horizon where atmospheric errors are at

their greatest. However, if you only have a few satellites in your data file, you may

prefer to include low elevation satellites despite their atmospheric errors, in order

to improve the geometry of your solution

16

Using Rhino Post-Processor

Filtering Options for Shape and RINEX Files

Signal-To-Noise Ratio Thresholds:

The RINEX format includes a field that records the quality of the observations,

according to the signal-to-noise ratio reported by the receiver. RINEX defines a

scale from 1 (worst) to 9 (best). The RINEX-recommended minimum is 5, which

means that observations with a signal-to-noise indicator below 5 should not be

used in data processing.

17

Using Rhino Post-Processor

Processing Your Data

The screen below shows that the Rover, Reference and Emphemeris has been

enter and that you are now ready for differentially correcting for both shape and

RINEX Files. Once you press the “Process” button data processing will being.

When the correction process starts, a blue status bar will apear at the bottom of

the screen, as shown below.

Post-Processing a RINEX FILE

Post-Processing a Shape FILE

Post-Processing a RINEX FILE

Post-Processing a Shape FILE

18

Using Rhino Post-Processor

Viewing Log Files

Once the processing is complete, a results screen will be shown. From this screen,

you will be able to view or save the results and final calculated corrdinates of

your processing session. To save the results, press the “Save” button in the lower
left-hand corner of this page.

19

Contact Information

Contact Information

US Positioning Contact Information

Headquarters

US Positioning Group, LLC

5865 S. Sossaman Road

Mesa, Arizona 85212

Help and support

US Positioning Home Page

www.uspositioning.com

Software Demos & Product Literature

www.RhinoGPS.com

Support by e-mail

[e-mail]

Information by e-mail

[e-mail]

Phone Numbers

800.6 G P S L O G or

480.988.1000

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