Distance-measuring system and distance-measuring method

A distance-measuring system, comprising:

• a first ranging sensor that detects, for a subject within a first detection range, a distance from the first ranging sensor to the subject;
• a second ranging sensor that detects, for a subject within a second detection range more limited than the first detection range, a distance from the second ranging sensor to the subject and has resolution higher than resolution of the first ranging sensor;
• and
• an image processing device, wherein
• the image processing device includes:
• a machine detector that detects a position of a mobile machine, based on a first sensed result obtained by the first ranging sensor;
• a sensor controller that adjusts the second detection range to incorporate the position of the mobile machine detected by the machine detector into the second detection range covered based on the first sensed result obtained by the first ranging sensor;
• and
• a controller that controls the mobile machine, based on a second sensed result obtained by the second ranging sensor.