| 摘要 |
This navigation device contains a displacement sensor which supplies signals corresponding to the vehicle movement, a gyroscope arrangement which continuously supplies signals corresponding to the alignment of the vehicle with respect to the reference direction, and an analysing circuit which determines position signals from these signals. So that the drift of the gyroscope arrangement when the vehicle is stopped is at least largely eliminated, the delivery of signals from the gyroscope arrangement to the evaluating circuit is suppressed when the vehicle is stopped. However, the signals are supplied to two memories which are in each case cleared after a time T but at an interval of T/2 with respect to one another; T/2 being in each case somewhat greater than the maximum possible period which can occur between the beginning of travel and the occurrence of the first signal of the displacement sensor. If the first displacement sensor signal occurs again, the content of the memory which has not been cleared for more than T/2 is used for the sign-correct correction of the value of the alignment of the vehicle with respect to the reference direction and, at the same time, the suppression of the gyroscope signals to the analysing circuit is cancelled. <IMAGE>
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