| 摘要 |
A ranging method comprises the steps of: obtaining a one- or two- way trip time of a received wireless signal (e.g radar or mobile phone signal) from an object; calculating a statistical value (e.g. standard deviation (SD) based on power spectral density of noise, bandwidth of an IF amplifier, and signal duration) of a rise time of the received wireless signal; when the statistical value of the rising time of the received wireless signal is smaller than a threshold, correcting the trip time according to the statistical value (FIG. 7A, S703) and hence calculating the distance; and when the statistical value exceeds the threshold, adjusting a parameter accordingly and trying again. This overcomes inaccuracies arising from noise which may be regarded as white Gaussian noise. |
