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DRAFT
P440 Data Sheet / User Guide
Table 4: Maximum operating range of a P440 range measurement system in Free Space and
over an Open Field for various Pulse Integration Index (PII) settings
6.3 Range Measurement Rate
Ranging Conversation Time
is the amount of time required to take a single TW-TOF range
measurement. The maximum measurement rate is limited by the Host to P440 overhead required to
initiate a range request. This overhead will limit the measurement by approximately 30% of the
values shown in the table below. This overhead is eliminated when the range requests are handled
through RangeNet.
The
Maximum Range Measurement Rate
is shown in
Table 5
and is achieved when two radios are
operated as a network consisting of a single requester unit and a single responder unit.
Table 5: Data and ranging performance characteristics at maximum legal transmit power
6.4 Precision Range Measurement Precision, Accuracy, and Bias
6.4.1 Precision and Accuracy in LOS Conditions
The Line of Sight (LOS) Precision and Accuracy specification is based on a measurement campaign
that included 20,000 range measurements taken in an open field, over an operating range that varied
from 2 ft. to 300 ft., for PIIs 4 through 8 inclusive, at minimum and maximum transmit gain, when
the received signal was linear and also when it was in compression. The quoted values are the results
of the composite of all of the measurements. This includes combinations of settings that may not be
PII
Max Range (m)
(Free Space)
Typical Max Range (m)
(Open Field)
4
66
5
101
6
145
7
207
500
8
260
600
9
410
800
PII
Range Conversation Time
(milliseconds)
Maximum Range
Measurement Rate (Hz)
4
8.0
125.0
5
9.7
103.1
6
13.7
73.0
7
21.3
46.9
8
36.7
27.2
9
68.0
14.7
