RF Tag Devices
S*R Long Range RF Tags are passive retroreflectors which reflect
radiation back in the direction from which it came. Because of
retroreflective gain (the same principle exhibited by road signs and
bicycle reflectors) the radar return is quite large for the size of
the tag. Typical operating ranges are on the order of 1,000
meters for tags illuminated by a hand-held radar to ranges exceeding
60 miles for tags illuminated by an airborne radar. Tag modulation is
matched to the signal processing capabilities of the interrogating
Angle of Arrival Simulation
S*R has developed an Angle of Arrival (AOA) Simulation test
employing microprocessor-controlled electromechanical hardware which
duplicates the effect of electromagnetic signals impinging on the
S*R's Angle of Arrival Simulation uses a centroid technique
measuring the field from four antennals arranged in a square (quad).
This is identical to finding the mechanical C.G.
This approach offers several advantages over flight testing:
• There is no risk of accident or signal compromise
• Cost per run is much lower that flight test
• EM Environment levels can be independently tailored to suit test
• Spectra Research's approach uses a panel with 15 antennas and the
associated hardware. This approach offers the advantages of simpler
equipment, and the ability to simulate different signals.