User's Manual

10 P330 Data Sheet / User Guide
DRAFT
The RangeNet GUI is provided with a User Guide (320-0338 P300 RangeNet User Guide) and a
Quick Start Guide (320-0337 P300 Ranging and Location Quick Start Guide) that illustrate operation
of the equipment. Within 1 hour of receiving the equipment, the user will be able to measure range,
operate a network and localize.
2.4 API and GUI as Development Tools
This section provides a high level summary of the API and discusses how the RangeNet GUI can be
used as a development tool.
In general, the RangeNet GUI performs as one would expect. It allows the user to configure the
P330s, initiate range requests, move in and out of a network, calculate location, move to and from
different sleep states, measure the P330 temperature, display status, hardware and software version
numbers as well as other useful information. In addition, the RangeNet GUI allows the user to
display and log collected data as well as all communications between the Host and the P330.
2.4.1 Ranging Measurement with RangeNet
The RangeNet GUI allows the user to configure the P330 and take range measurements. The P330
supports the following two forms of range measurement.
Precision Range Measurements (PRM) are taken using the TW-TOF ranging technique. These
readings typically have high accuracy and are provided with estimates of range error as well as flags
that warn of possible errors. The user can use these range error estimates to drive a Kalman Filter.
The flags can be used to disregard inaccurate readings.
Echo Last Range (ELR) measurements are Precision Range Measurements which have been taken
between two other radios in the system. In other words, any time a unit takes a PRM it will broadcast
the last range measurement it took to any other radios in the area. For example, if Unit A measures
the distance between Unit A and Unit B, it will broadcast this range measurement to Units C, D, E,
etc., whenever it next initiates a range measurement. This is an alternate way of automatically
distributing range information through a system.
The RangeNet GUI allows the user to configure the unit and take range measurements. It also adds
an extra level of system software in that it will allow the user to:
 Request a single range measurement, a fixed number of measurements, or a continuous series
of range measurements.
 Display various DW1000 sources performance statistics including: Max Noise, STD Noise,
First Path, First Path Amplitude 1, First Path Amplitude 2, First Path Amplitude 3, RX
Preamble Count, and Max Growth CIR.
 Compute and display P330 statistics including: Range Error Estimate, First Path Power and
RX Power (according to Decawave’s published algorithm), Range Status, and the number of
milliseconds required to take a measurement.
 Display quality metrics that provide a warning if the reading is suspect.
 Calculate performance statistics. For example, if the user requests a finite number of ranges,
the RangeNet GUI will compute the range success rate, the average range, the standard
deviation of the range measurements, and the average First Path Power.
 Recalibrate a given link such that the bias or offset inherent in a range measurement can be
compensated.