Radio Location Accuracy
Range Ring Accuracy
The range ring accuracy is dependent on:
1) Accurate Clock Timing and Time Stamping
2) Accurate Knowledge of 'Time-Delay' through RFID
3) Signal to Noise Ratio ( Cross-Correlation Peak Fidelity)
Given
that we are using a high bandwidth signal, the cross correlation peak
of the matched filter will be very narrow (meaning less time
ambiquity).
Anticipated accuracy: < 5 meter 3 sigma
DF System Accuracy
Unfortunately
after much study, the DF System accuracy will not be quite as accurate.
If we restrict ourselves to a four element array, the 3dB
beamwidth is quite large. Because of this limitation, the
resolution of the angle of arrival estimate will be rough. This
system will be able to easily identify which quadrant the RFID is with
repect ot the range ring. Given that the RFID will nominally be within
20 meters, this is an acceptable limitation.