Receiver And File Maintenance - Javad DELTA Operator's Manual

Usually, the receiver will start to output the coordinates of the antenna's phase center along with the
solution type within 10–30 seconds. However, UHF radios and GSM phones may take as long as 60
seconds to synchronize. The geodetic coordinates displayed on the Location tab are always computed in
WGS84 and have four solution types.
• Standalone – where the receiver computes 3D coordinates in autonomous mode without using
differential corrections.
• Code differential – where the Rover receiver computes the current relative coordinate in
differential mode using only pseudo ranges.
• RTK float – where the Rover receiver computes the current relative coordinates in differential
mode using both pseudo ranges and phases; however, with a float solution, the phase ambiguity is
not a fixed integer number and the "float" estimate is used instead.
• RTK fixed – where the Rover receiver computes current relative coordinates, with ambiguity
fixing, in differential mode. The LQ field reflects the status of the received differential messages
and contains the following information:
• Data link quality in percentage
• Time (in seconds) elapsed since the last received message
• Total number of received correct messages (dependent on the message type received)
• Total number of received corrupt messages (dependent on the message type received)
• If the receiver is not (for some reason) receiving differential corrections, or if none of the ports has
been configured to receive differential corrections, the LQ field will either be empty or it will look
like this: 100%(999,0000,0000).er transmits this information via radio to the Rover receiver.
• The Rover receiver applies correction information from the Base station to its current location to
accurately calculate one or more points. Rovers are mobile GNSS receivers on a measuring pole
or bipod that compares the information from the Base station to the data it logs from satellites and
applies correction algorithms to accurately calculate a new point.
In applications intended for post-processing, the receivers typically log code phase and/or carrier phase
measurements separately from common satellites and during the same time interval. This data is then
processed using post-processing software (for example, Justin).

1.7. Receiver and File Maintenance

If post-processing the data after completing a measuring, the data in the receiver's memory will need to
be downloaded to a computer. Downloading and deleting files will also prepare the receiver's memory for
the next measuring. Occasionally, the receiver's NVRAM may need to be cleared to eliminate
communication or tracking problems. As project expectations expand, the receiver's OAF may need to be
updated to provide expanded operation and functionality. The receiver requires firmware to properly
operate and provide appropriate functionality. As JAVAD GNSS releases firmware updates, loading these
updates into the receiver will ensure that the receiver operates at its full potential.
www.javad.com
Description and Operation
Receiver and File Maintenance
Real Time Kinematic Measuring
31