PURPOSE:To analyze the three-dimensional running locus of a vehicle accurately, by detecting three kinds of data of the vehicle speed, running path gradient, and running bearing of the running vehicle only by running the vehicle on the spot, and continuously detecting the present position of the vehicle based on the data and the running distance of the vehicle. CONSTITUTION:When a vehicle is made to run on the working spot and a system is started, a vehicle speed V, a running bearing angle gamma, and a vehicle slant angle theta are individually detected by sensors 1-3. The three detected analog signals are converted into digital values by A/D converters 4-6. The converted values are expressed by 2's complement in 12 bits and sampled by a CPU7 at every specified time interval. The CPU7 reads a data table corresponding to the inputted sample value from an ROM9-1, and executes the operation for analyzing the running locus of the vehicle working on the spot. Thus the result is outputted. Namely, the system executes the cycle of sampling of the speed V, the slant angle theta, and the bearing angle gamma of the running vehicle operation based on the sampled value outputting of the result of the operation.
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