Target detection apparatus and system

A target detection system, comprising:

• a first target detection apparatus having a plurality of sensors for transmitting a first transmission signal to respective different angle ranges and receiving a signal reflected by a target, and extracting first distance information about the target from a received signal;
• a second target detection apparatus having a plurality of sensors for transmitting a second transmission signal to respective different angle ranges and receiving a signal reflected by the target, and extracting second distance information about the target from a received signal;
• and
• a processing device for calculating a position of the target according to the first and second distance information using a condition that the position of the target is included in an area common to both a first angle range when the first target detection apparatus extracts the first distance information and a second angle range when the second target detection apparatus extracts the second distance information.

A target detection system, comprising:

• a first target detection apparatus for transmitting a first transmission signal, receiving a signal reflected by a target, and extracting first distance information about the target from a received signal;
• a second target detection apparatus for transmitting a second transmission signal, receiving a signal reflected by the target, and extracting second distance information about the target from a received signal;
• and
• a processing device for enabling the first and second target detection apparatuses to operate for a plurality of targets, acquiring first distance information from the first target detection apparatus to each target, and the second distance information from the second target detection apparatus to each target, obtaining coordinates of intersections from equations of four circles having, as radii, a minimum value and a maximum value of the first distance information for the targets and a minimum value and a maximum value of the second distance information for the targets, and identifying a location range of the plurality of targets using the coordinates of the intersections.