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DRAFT
P440 Data Sheet / User Guide
Fig.1: A typical received waveform: signal magnitude (relative strength) vs time (increments of
61ps)
This is a powerful capability for several reasons:
Oversampling enables correlation processing, thereby producing reliable sub-centimeter
range estimates.
By analyzing the shape of the received waveform it is possible to determine importation
characteristics of the channel such as (a) whether or not the signal is clear or non-line-of -
sight (NLOS), (b) determine if the signal is in compression, and (c) whether or not the signal
is corrupted by multipath or Fresnel effects. This is illustrated in
Figure 2
.
It is possible to measure the signal strength of the first arriving pulse as opposed to the
strength of the largest multipath signal.
It is possible to measure the background noise level. That, in conjunction with the signal
strength measurement, allows the measurement of the received SNR.
It is possible to characterize the received waveform and produce an error estimate of the
range measurement estimate.
Fig.2: Received waveforms captured at 61ps intervals (2x Nyquist) in a variety of
environments
