| 摘要 |
A stroboscopic method for measurement of radio pulse signal transmission time involves discretization of measured signal, conversion thereof to digital code and calculation of radio pulse signal transmission time. Frequency, durationperiod of signalsemitted radio pulse signal are formed from one generator of synchronizing signals.Emitted radio pulse and measured signal are applied to one ADC input for conversion into digital code in two steps. At first step emitted radio pulse is applied once only to ADC input for determination of initial phase thereof. At second step determined is a phase of measured signals which exceed threshold sensitivity. Transmission time of radio pulse signals is calculated according to formula:, whereinis a value of emitted signal phase within the limits of 0 to 2⋅&pgr;;- absolute measured value of measured signal phase within the limits of 0 to 2⋅&pgr; at instant when value of ADC code exceeds threshold of detection thereof;- signal frequency. Frequency of discretization signalsof ADC and ROM reading out codes of reference signal sine and cosine values is obtained by division of frequency of synchronizing signal generator and selected equal to, whereinis a number of virtual steps of output signal per period thereof after stroboscopic conversion at ADC output;is integer number (1, 2, 3…). |
