Phase Recovery in Sensor Networks Based on Incoherent Repeater Elements
A coherent sensor network without hardware link
between the network nodes can be set up based on a single
MIMO-radar and several incoherent repeater elements spatially
distributed. The repeater sends back the radar signal on the same
way it was impinging onto the repeater. All repeater elements
have an integrated double-sideband modulator, which allows to
separate the signals of different repeater elements at the radar.
For angle estimation, the phases of the signals of the repeater
elements are crucial, but due to an unknown initial phase
of the modulation signal, they cannot be determined directly.
Thus, a reconstruction of the modulation phase is necessary for
network-based coherent angle estimation. In this paper, a concept
for phase reconstruction in such type of networks is proposed,
exploiting both sidebands of the modulated signal of the repeater