| 摘要 |
Navigation device of the type including a set of sensors (3) for an acceleration vector, a set of direction sensors (2) and calculation means (1) making calculations of geographical coordinates on the basis of the data received from the sets of sensors, by means of acceleration integrators (11) giving velocity values and velocity integrators (14) giving distance values, characterised in that it includes comparators (12) including two inputs, each of these comparators delivering a positive signal only if the values of the input parameters are less than the reference value ( epsilon a epsilon v) received on the other input, a set of "and" gates (15) receiving the signals from each of the comparators.
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