KEYWORDS: Radar, Signal detection, Telecommunications, Electronic filtering, RF communications, Interference (communication), Signal to noise ratio, Radar signal processing, Modulation, Sensors
RF (radio-frequency) tags have drawn increasing research interest because of their great potential uses in many radio
frequency identification applications. They can also be configured to work with radar as a communication channel by
receiving radar acquisition signals, suitably coding these, and retransmitting them back to the radar. This paper proposes
a system model for the communication between a noise radar and multiple RF tags. The radar interrogates the RF tags in
a region of interest by sending ultrawideband noise signals. Upon receiving the radar's signal, all the tags within the
radar's range wake up, and respond to the radar with simple messages. The RF tag filters the radar signal to a unique
spectral band, which represents its identification information, and different RF tags occupy different non-overlapping
bands of the spectrum of the radar signal. Tag messages are modulated onto the waveform through taps of weighted
delays. The radar decodes the RF tag identifications and corresponding messages by cross-correlating the RF tag
returned signals with the replica of the radar transmitted signal. Calculations and simulation results both show that the
proposed system is capable of communicating simple messages between RF tags and radar.
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