Time of flight measurement with sub-sampling period resolution using Software Defined Radio
Abstract
Timing signal delay difference with subsampling period resolution is achieved by spectrum spreading using a pseudo-random sequence generator and fitting the cross-correlation peak of the received signal. An experimental demonstration on various radiofrequency software defined radio (SDR) receivers demonstrates sub-ps synchronization on the Ettus Research X310 BasicRX frontend, picosecond synchronization of the AD9361 fitted on the Ettus Research B210, and a drift of a few hundred picoseconds during measurements lasting a few seconds with the Lime Microsystems LMS7002 fitted on the Fairwaves XTRX. All measurements are achieved with 200 ns sampling period or a rate of 5 Msamples/s, emphasizing the timing resolution improvement of at least 1000-fold over the sampling period.
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