Object sensing device and object sensing method

An object sensing device constituted of a transmitter including a transmission antenna, and a receiver including a reception antenna, wherein

• the transmitter irradiates radio frequency (RF) signals of a plurality of frequencies from the transmission antenna toward a target object,
• the receiver receives the RF signals of a plurality of the frequencies reflected from the target object,
• the receiver has a phase adjusting equipment for adjusting phases of the received RF signals having respective frequencies, and
• the receiver controls directivity of antenna gain by the phase adjusting function, and the receiver detects a position and a shape of the target object by measuring an intensity distribution of the RF signals incoming to the receiver by directivity control of the antenna gain,
• wherein
• the transmitter further includes a transmitting controller, a digital-to-analog converter, a band-pass filter, a mixer, a local oscillation signal source, and a power amplifier,
• the transmitting controller transmits a digital signal toward the digital-to-analog converter,
• the digital-to-analog converter converts the digital signal to an analog IF signal, the analog IF signal is input to the mixer via the band-pass filter,
• the local oscillation signal source inputs a local oscillation signal to the mixer,
• the mixer frequency-converts the analog IF signal to the RF signal by the local oscillation signal, and outputs the RF signal,
• the RF signal output from the mixer is transmitted from the transmission antenna after being amplified by the power amplifier,
• the receiver further includes a receiving controller, an analog-to-digital converter, a second band-pass filter, a second mixer, a second local oscillation signal source, and a second amplifier,
• the reception antenna receives the RF signal,
• the second amplifier amplifies the RF signal received by the reception antenna, and outputs the amplified RF signal to the second mixer,
• the second local oscillation signal source inputs the local oscillation signal to the second mixer,
• the second mixer frequency-converts the RF signal to a second analog IF signal by the local oscillation signal, and outputs the analog IF signal,
• the second analog-IF signal is input to the receiving controller and an analog-to-digital converter via the second band-pass filter,
• the receiving controller and the analog-to-digital converter convert the second analog-IF signal to a second digital signal representing complex amplitudes of the RF signal, and inputs the digital signal to the receiving controller,
• the receiving controller transfers the second digital signal to a data processor, and
• the data processor performs processing of detecting a position or a shape of the target object, based on the second digital signal.