Object detection device and operating method thereof

An object detection device comprising:

• a detector configured to detect infrared light reflected from an object and output an electrical signal in an analog domain corresponding to the infrared light, as a received signal;
• a converter configured to perform analog-to-digital conversion on the received signal;
• a splitter provided between the detector and the converter, and configured to split the received signal into a plurality of sub received signals;
• a plurality of signal lines provided between the splitter and the converter, the plurality of signal lines comprising:
• a non-delay line configured to send a first sub received signal from among the plurality of sub received signals to the converter;
• and
• one or more time-delay lines configured to time-delay sub received signals other than the first sub received signal, from among the plurality of sub received signals, and send the time-delayed sub received signals to the converter, wherein the converter is further configured to convert the first sub received signal into a digital signal and convert the time-delayed sub received signals into one or more time-delayed digital signals;
• and
• a processor configured to:
• generate a plurality of cross-correlation signals, the plurality of cross-correlation signals comprising a first cross-correlation signal between each of the digital signal and a transmission signal corresponding to the infrared light, and second cross-correlation signals respectively between the one or more time-delayed digital signals and the transmission signal corresponding to the infrared light;
• estimate a plurality of maximum sampling points of the plurality of cross-correlation signals, respectively, based on a predetermined number of a plurality of sampling points extracted from each of the plurality of cross-correlation signals at a sampling rate of the converter;
• and
• determine a distance to the object based on the plurality of maximum sampling points,
• wherein a pulse width of the infrared light, a pulse width of the received signal, and a pulse width of the transmission signal are the same as one another, and a time delay of the one or more time-delayed digital signals is less than the pulse width of the received signal.