Tunable laser distance simulator and distance simulation method

The invention discloses a tunable laser distance simulator and a detection method, which are used for providing distance information for indoor debugging of a laser ranging sensor. According to the tunable laser distance simulator, the dynamic distance information of laser transmission is simulated by means of tunable delay time information of a signal delayer; by attenuation of an optical attenuator, the attenuation of laser transmission along with factors such as distance, atmospheric environment and geographic environment of an incidence point, is simulated truly as far as possible; a system is controlled in real time by a labview program which receives the simulation distance information from an upper level at any time, then the distance information is simulated by controlling the whole tunable laser distance simulator system, so that the accuracy of the distance information detected by the laser ranging sensor can be verified. In addition, the distance simulator is further provided with a special self-calibration system so as to prevent certain technical parameters from drifting along with use time, environments, etc. According to the tunable laser distance simulator, the high-precision and wide-range distance information is simulated, and great convenience is provided for indoor test debugging of the laser ranging sensor.