Abstract
A photonics-assisted joint digital and analog self-interference cancellation and de-chirping method for frequency-modulated continuous-wave radar systems is proposed based on a dual-parallel Mach–Zehnder modulator (DP-MZM). The received signal, including both the echo signal reflected by the target and the self-interferences, is sent to one RF port of the upper dual-drive Mach–Zehnder modulator (DD-MZM) in the DP-MZM. The reference signal used for self-interference cancellation is constructed in the digital domain via digital signal processing, which is sent to the other RF port of the upper DD-MZM. Another reference signal for de-chirping is applied to one RF port of the lower DD-MZM in the DP-MZM. After the optical signals are detected in a photodetector, the de-chirped signal with self-interference suppressed can be obtained. An experiment is performed, in which the self-interference with a bandwidth of 4 GHz can be suppressed by around 20 dB after de-chirping.
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