Novatel SMART-V1 Determining When the Position is Valid, Entering Commands, Logging Data

DETERMINING WHEN THE POSITION IS VALID

When the receiver has a valid position, the Solution Status field in CDU’s Position window shows Computed.

ENTERING COMMANDS

The SMART-V1/V1G uses a comprehensive command interface. Commands can be sent to the receiver using the Console window in CDU, which is opened from the View menu. Enter commands in the text box at the bottom of the Console window.

The following information is important when entering commands:

•Commands can be entered in three formats:

•ASCII (log bestposa)

•Abbreviated ASCII (log bestpos)

•Binary (log bestposb).

Abbreviated ASCII is the best format to use when you wish to work with the receiver directly. For data collection, use ASCII or Binary.

•Press Enter to send the command string to the receiver.

•The commands are not case sensitive.

The OEMV Family Quick Reference Guide provided with the receiver lists the available commands and the parameters they use for the Abbreviated ASCII format.

LOGGING DATA

An extensive collection of logs has been created to capture the data your SMART-V1/V1G receives and processes. These logs can be directed to a SMART-V1/V1G port (COM1, COM2 or USB) and can be automatically generated when new or changed data becomes available or at regular intervals. The available logs are listed in the OEMV Family Quick Reference Guide.

To log data, use the LOG command. For example, to log the pseudorange position to COM 2 every 30 seconds, enter the following:

LOG COM2 PSRPOS ONTIME 30

Logs can be generated in one of three formats: ASCII, Abbreviated ASCII, or Binary. Refer to the OEMV Family Firmware Reference Manual (OM-20000094)for information on the LOG command, specifying the output format, and the detailed contents of each log.

If you prefer, CDU provides a graphical interface for configuring data logging. Select Logging Control Window from the Tools menu. In the Logging Control window, you can select which logs to capture and choose to which ports to send the data. In addition, you can specify a file in which to save the data.

ENABLING SBAS POSITIONING

SMART-V1/V1G models are also capable of SBAS positioning. This positioning mode is enabled using the SBASCONTROL command. The following commands are typically used to enable WAAS (North America) and EGNOS (Europe) systems:

SBASCONTROL ENABLE WAAS

SBASCONTROL ENABLE EGNOS

Once enabled, the Position Type field shown in CDU’s Position window should change from Single to WAAS and you may see SBAS satellites in the Constellation window.

ENABLING L-BAND POSITIONING

L-Band equipped receivers allow you to achieve sub-meter accuracy. To use this positioning mode, you must enable L-band tracking to the Canada-Wide Differential GPS (CDGPS) or OmniSTAR signal. A subscription to OmniSTAR is required to use the OmniSTAR service (visit http://www.omnistar.com and have your receiver’s serial number ready). The CDGPS signal is free and available without subscription over North America (visit http://www.cdgps.com).

The ASSIGNLBAND command allows you to set OmniSTAR or CDGPS base station communication parameters and to start tracking L-Band satellites. It should include a relevant frequency and data rate. The frequency assignment can be made in Hz or KHz. For example:

Hz: assignlband omnistar 1536782000 1200

KHz: assignlband omnistar 1536782 1200

A value entered in Hz is rounded to the nearest 500 Hz.

To confirm you are tracking an L-Band signal, log the L-Band status information by entering: log lbandstat. For example, if you are receiving CDGPS, the fifth field after the header should be 00c2:

lbandstata com1 0 43.5 finesteering 1295 149951.671 00000000 976f 34461;

1547546977 46.18 4541.0 0.00 00c2 00f0 ...

To specify the correction source, use the PSRDIFFSOURCE command as shown in the examples below:

PSRDIFFSOURCE	OMNISSTAR	or,
PSRDIFFSOURCE	CDGPS

otherwise it is left at the default AUTOMATIC.

Refer to the OEMV Family Firmware Reference Manual for more details on individual L-Band or SBAS commands and logs.