Overall comparison of the echolocating bat and the mmWBat. (a) Schematic of the echolocating bat with multitarget tiny motion perception. (b) Schematic of the biosonar system. (c) Schematic of the mmWBat system with micromotion perception in FFOV. (d) Block diagram of the mmWBat system. Txs: transmitters; Rxs: receivers; ADC: analogue-to-digital converter.