Patent ID: 8848171
Filing Date: 2014-09-30
Classification: G01C,G01S

Abstract:
1. A highly accurate, electro-optical time of flight distance measuring device for determining a distance to a target, comprising: a transmitter for sending out a pulse shaped optical radiation to the; a receiver for an optical return signal, which comprises parts of the optical radiation scattered back from the target, built for turning the optical return signal to an electrical signal; a filter with a transfer-function for filtering the electrical signal; a waveform-sampler, as an analog-to-digital-converter, for digitizing the pulse shape from the filtered electrical signal as time- and value-quantified digital data; a computation means for a numerical evaluation of the distance according to the pulse shape or a pulse shape representing numerical signature from the digital data, with a resolution in time being higher than the sampling interval of the waveform-sampler by numerical resampling of the pulse shape represented by the digital data, wherein the filter is built in such a way that its transfer-function is of at least 7 wherein the computation means for a numerical evaluation of the distance according to the pulse shape or a pulse shape representing numerical signature from the digital data, with a resolution in time being higher than the sampling interval of the waveform-sampler by numerical resampling of the pulse shape represented by the digital data according to the Nyquist-Shannon-Theorem as amplitude values at instances of time in-between the time-quantifying sampling-times when no actual value of the electrical signal had been sampled.