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Geodetic Base Station Software (GBSS™). GBSS Training. Basic Agenda. Purpose of GBSS GBSS Program Configurations Installation and Un-installs General and Detailed Program Use Miscellaneous Topics. Purpose of GBSS. Continuous logging of GPS Data

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Presentation Transcript

Basic agenda

May 2002

Basic Agenda

  • Purpose of GBSS

  • GBSS Program Configurations

  • Installation and Un-installs

  • General and Detailed Program Use

  • Miscellaneous Topics

Purpose of gbss

May 2002

Purpose of GBSS

  • Continuous logging of GPS Data

  • Multitasking/Multithreaded (i.e., can be run in concert with other programs on the computer)

  • Can operate in concert with FTP, WWW or BBS systems.

High level features

May 2002

High-Level Features

  • Windows 9x/NT interface

  • Logs data in up to 4 directories simultaneously

  • Provides PKZIP or PKZIPC compression

  • Can generate both single-frequency and dual- frequency data files from a single dual-frequency receiver

  • Logged data accessible via other software (e.g., FTP, WWW, and BBS)

  • Full user control over file closures

  • Terminal window

  • Can be configured to automatically connect on boot-up

Gbss vs micro manager pro sw

May 2002

GBSS logs data from any Thales reference receiver to a PC

One copy of GBSS controls only one reference receiver

PC must be co-located with receiver

Micro-Manager Pro controls only MicroZ-CGRS receivers

Micro-Manager Pro controls multiple uZ-CGRS receivers

Receiver(s) may be remotely controlled via a modem

GBSS vs. Micro-Manager™ Pro SW


May 2002


  • Installation follows normal software installation procedures

    • Run “Setup.exe”

    • Follow remaining instructions

  • Software “Uninstalled” using normal uninstall procedures

Installation procedures continued

May 2002

Installation Procedures(continued)

  • After installation, choose the option to reboot.

    • Failure to reboot may lock your computer if you attempt to run GBSS (sentinel drivers not fully installed)

    • Rebooting allows the sentinel drivers to be fully installed

Installation procedures continued1

May 2002

Installation Procedures(continued)

  • Attach the Software Sentinel to the Parallel Port.

    • Install as close to the computer as possible.

Windows 95 specific installations

May 2002

Windows 95 Specific Installations

  • Why?

    • GBSS uses MS-DOS version of PKZIP (temporarily) and the MS-DOS Window created by GBSS does not close when zipping has completed.

    • How to Fix

    • When the first MS-DOS window for PKZIP appears, use the Properties button to set the “Close on exit” checkbox of the “Program” Tab.

    • What does this do?

    • Creates a PIF file in the directory pointed to by your “TEMP” environment variable.

Windows nt specific installations

May 2002

Windows NT Specific Installations

  • Only Needed When using the Auto-Connect Feature

  • Why?

    • Windows NT requires someone to logon in order for Windows to start.

    • Windows Plug-and-Play feature may misinterpret a powered Thales receiver as a serial mouse.

  • How to Fix (Logon issue)

    • Modify Registry to remove Login requirement (detailed in Manual)

  • How to Fix (Plug-and-Play issue)

    • Modify BOOT.INI with “/NoSerialMice” (See User’s Manual for details)

Uninstall procedure

May 2002

Uninstall Procedure

  • Follow Normal Uninstall Procedures

    • From “My Computer” Select “Control Panel”

    • From “Control Panel” Select “Add/Remove Programs”

    • Select the item related to GBSS and then press the “Add/Remove” button.

    • Follow remaining instructions.

Program use topics

May 2002

Program Use Topics

  • Configuring GBSS

  • Connecting to and Disconnecting from a Receiver

  • Display Windows

  • Terminal Window

  • Simulation/Playback

  • Uploading a File to the Receiver

Configuration menus

May 2002

Configuration Menus

  • Configuration Menus are Active (i.e., allow editing) only when not connected to a receiver (i.e., all setup must occur prior to connecting to the receiver).

  • Menus

    • Comms

    • Receiver

    • Site

    • Other Options

    • GPS Time

Configuration menus continued

May 2002

Configuration Menus(continued)

  • All editing on the menus accepted by pressing the “OK” button.

  • All edited values are discarded, without warning, when the “Cancel” button or the “X” button (to close the window) is pressed.

Communication configuration

May 2002

Communication Configuration

  • Choose correct port

  • Configure as shown for MicroZ CGRS

Configure receiver

May 2002

Configure Receiver

Configure receiver1

May 2002

Configure Receiver

  • Active Mode vs. Passive Mode

  • Active Mode Controls

    • Command Recording Interval and Elevation Mask

    • Disable Receiver Storage of Data

    • Upload Site Data

    • Upload File (Uploaded when connection)

  • Passive Mode Information

    • Receive Type

    • Channel and Nav. Version

Site configuration

May 2002

Site Configuration

Configure site menu

May 2002

Configure Site Menu

  • Site name used in B, E, S, and T-File naming (need legal DOS characters, ‘?’ characters translated to ‘_’)

    • File naming convention detailed in the User’s Manual

  • All coordinates translated to Lat, Lon, and Ht

    • If site data is to be uploaded to receiver (as per Receiver Configuration Menu), zero values of Lat, Lon, and Ht will not be sent to the receiver.

Output files configuration

May 2002

Output Files Configuration

  • Menu Layout

    • 5 Tabs

      • File Modes

      • Data Files

      • Compression Files

      • NMEA Capture File

      • RSIM Capture File

    • “Other File Output Options” - Apply Across All Tabbed Areas

File modes

May 2002

File Modes

  • GBSS 3.2 supports RINEX 2.2 long file names for sessions shorter than 1 hour

File output configuration

May 2002

File Output Configuration

  • Data Files Tab

    • Output Directories

      • Primary Data Directory

      • Secondary Data Directory

    • Selection of File Types

      • Primary vs. Secondary

      • B, E, and S-Files (S-File information comes from site configuration menu)

      • L1 Only B, E, and S-Files

      • Ion File

      • Trap File

File output configuration continued

May 2002

File Output Configuration (Continued)

Rinex configuration

May 2002

RINEX Configuration

  • Set up RINEX Options and Headers

Rinex configuration continued

May 2002

RINEX Configuration (Continued)

Other rinex options set within converter program xyzashrx

May 2002

Other RINEX Options Set Within Converter Program (XYZAshRX)

  • Start XYZAshRx manually

  • Set Options

  • Close Program

  • Future runs will use new settings

Rinex output data types options

May 2002

RINEX Output Data Types Options

File output configuration continued1

May 2002

File Output Configuration (Continued)

  • What is a Trap File?

    • A collection of raw (i.e., uninterrupted) bytes received from the receiver.

    • Can be played back through GBSS in Playback or Simulation Modes.

    • The bytes are written before they are interpreted. That is, when File Duration option is used, the beginning and end of each trap file does not necessarily coincide with B, E, and S-Files

    • Why a Trap File?

    • You can later play back a trap file with different GBSS parameters. For example, if the receiver is set to output data at 1 Hz. and GBSS is configured to filter the epoch data to 5 seconds, then one can playback the trap file with a different epoch filter rate.

File output configuration continued2

May 2002

File Output Configuration (Continued)

File output configuration continued3

May 2002

File Output Configuration (Continued)

  • Compression Files Tab

    • Output Directories

      • Primary Compression Directory

      • Secondary Compression Directory

    • Selection of File Types

      • Primary V. Secondary

      • Types only enabled when associated selection made in Data Files Tab

    • Uses PKZIP 2.04g or PK250DOS or PKZIPC at the end of the File Duration

File output configuration continued4

May 2002

File Output Configuration (Continued)

File output configuration continued5

May 2002

File Output Configuration (Continued)

  • NMEA Capture File Tab

    • Allows Selection of a File in Which to Place Captured NMEA Messages

    • One Selects Messages, when captured, to be Written to the Capture File

    • GBSS Does NOT Issue the Commands to Start NMEA Message Transmission (you can use the terminal window)

Other file output options

May 2002

Other File Output Options

Other file output options1

May 2002

Other File Output Options

  • Some users require 0.5 or 0.25 hours file duration

  • Set file re-open rate to 60 sec

  • May filter to another rate if used at RTK broadcast site

    • Receiver will be running at 1 Hz

  • Delete files older than X days (for example 5)

  • Use Ashtech subdirectory structure for automatic directory naming

Other options configuration menu

May 2002

Other Options Configuration Menu

  • Verbose Diagnostic Messages (displayed in the diagnostic messages window)

  • Writing Diagnostic Messages to A File

    • Log File (naming convention in User’s Manual)

  • Playing Sounds

    • Warning Sound and Yellow Icon Flash

      • Occurs when more than 4% of the bytes are unrecognized over a sustained period.

    • Alert Sound and Red Icon Flash

      • Occurs when more than 30% of the bytes are unrecognized over a sustained period OR the RS-232 status line changes (e.g., the RS-232 line is disconnected)

Gps time configuration

May 2002

GPS Time Configuration

  • Check “Use receiver timetag” Option

Configuring gbss for auto startup

May 2002

Configuring GBSS for Auto-Startup

  • Rationale: To have GBSS automatically connect and start logging should the computer be restarted (e.g., power failure)

  • Windows NT Platforms Need Registry edit

  • Placing GBSS in Start-Up Folder

  • Setting the Delay

    • Hardware drivers need to be completely initialized, the delay ensures they initialize before GBSS tries to access them.

    • e.g., C:\Program Files\Ashtech\GBSS\GBSS -C 45

Connect disconnect

May 2002


  • Connect To Receiver by Selecting “File | Connect”

  • Playback Trap Files (Simulating a Connection to the Receiver) by Selecting “File | Simulation”

  • Disconnect from Receiver by Selecting “File | Disconnect”

Display windows

May 2002

Display Windows

  • Display Windows Are Updated Only When Connected to a Receiver

  • Display Window Types

    • Main Window

    • Geodetic Position Window

    • Earth-Centered Earth-Fixed Position Window

    • Channel Summary Window

    • Diagnostic Message Window

    • Logging Summary Window

    • Time Display Window

  • All Windows Moveable and Sizable

    • Display Sub-Windows can be restored to original size

Main display window

May 2002

Main Display Window

  • Epoch Counters

  • Broadcast Message Counters

  • Error Counters

  • Available Disk Space

  • RS-232 Line Status Indicators

  • Logging Status Icon

  • Connect Status

  • Epoch Time Display

  • Sub-Window Display Area

Main display window1

May 2002

Main Display Window

Geodetic position window

May 2002

Geodetic Position Window

  • Upper Part Displays the Epoch Position

  • Lower Part Displays the WGS-84 Reference Position

    • From Site Configuration Menu OR

    • Receiver Output as Reference Position

Earth centered earth fixed position window

May 2002

Earth-Centered Earth-Fixed Position Window

  • Upper Part Displays the Epoch Position

  • Lower Part Displays the WGS-84 Reference Position

    • Site Configuration Menu OR

    • Receiver Output as Reference Position

    • When all Lat, Lon or Ht positions not entered, position displayed will be “Partial”.

Channel summary window

May 2002

Channel Summary Window

  • Shows Status Information Based Upon Channel Index

    • Satellite PRN

    • L1 C/A Signal-to-Noise

    • P1 Signal-to-Noise

    • P2 Signal-to-Noise

    • Satellite Elevation and Azimuth

    • Nav. Age (how many minutes past since nav. message for satellite)

Diagnostic message window

May 2002

Diagnostic Message Window

  • Displays diagnostic messages as they occur

  • Messages Preceded by [number] indicate the seconds of GPS week when the event occurred

  • Verboseness depends upon value set in “Other Options” Configuration

  • Most messages written verbatim to the LOG file (when enabled).

Logging summary window

May 2002

Logging Summary Window

  • Current Primary and Secondary Output Data (not compression) Directories

  • Output files -- color coded with directories to show relationships

  • When last interruption occurred and the number of interruptions

    • Information on each interruption is written to the LOG file when enabled

    • The number of interruptions (and the time of the last interruption) can be reset by pressing “Reset” button

Time display window

May 2002

Time Display Window

  • Lower Priority Window (i.e., depending upon system load, update of this window may not appear smooth).

  • GPS Time Shown in Gregorian Format (not to be confused with UTC).

  • Raw CPU Time Displayed

  • Local Time Displayed (GPS Time - Zone)

Terminal window

May 2002

Terminal Window

  • Used to allow Commands to Be entered

    • No need to add the <CR><LF> sequence to commands -- GBSS automatically adds them

  • Terminal Window Shown Whenever a File is Uploaded to Receiver

    • Uploaded data shown in the upper display area

    • Receiver responses shown in the lower display area.

Simulation and playback modes

May 2002

Simulation and Playback Modes

  • Use “File | Simulation” or “File | Playback”

    • Playback mode allows GBSS to convert the Trap file quickly

    • Simulation mode allows the user to alter the simulation speed

  • In both modes, GBSS acts as if it were actually connected to a receiver (with the exception of adjusting its CPU to GPS time offset)

  • Simulation or Playback terminated when end of data reached, user selects “File | Disconnect”, or user terminates the program

  • Files are named based only upon Raw CPU clock (never related to time stamps within the data)

Uploading files to receiver

May 2002

Uploading Files To Receiver

  • Before Receiver Actually Starts To Send Data (i.e., upon establishing a connection)

    • This file is specified in the Receiver Configuration Menu and is uploaded each time connection is established

  • During Actual Data Logging

    • User Selects “File | Upload File”

  • GBSS Must be in Active Mode

File renaming

May 2002

File Renaming

  • If GBSS is started, stopped, and then restarted (e.g., a power failure), GBSS will need to rename existing files to avoid overwriting -- IT DOES NOT APPEND TO EXISTING FILES.

  • Renaming starts by appending a ‘Z’ to the ends of file names. If these ‘Z’ files already exist, then GBSS uses the letter ‘Y’, and so on.

  • If GBSS reaches ‘A’, it will start to overwrite the files with the same name.

Abnormal number of erroneous or missing bytes

May 2002

Abnormal Number of Erroneous or Missing Bytes

  • Manifestations

    • Block Errors

    • Skipped Bytes

  • Possible Causes

    • Poor RS-232 Connection (poor quality cable, too long of a cable, or connections not securely fastened)

    • Computer Load Too High

    • Computer Power Save Mode is Enable (particularly in lap tops)

    • Poor/Cheap Communication Components in Computer (particularly in lap tops)

Hint boxes

May 2002

Hint Boxes

  • Hint Boxes Display Information about a Window Element

  • Hint Boxes are Displayed When the Mouse is Rested Over the Control for One Second.

  • GBSS Is Loaded with Hint Boxes in Both Data Entry and Data Display Window Elements.