Time of flight measurement with sub-sampling period resolution using Software Defined Radio

  • J M Friedt FEMTO-ST Time & Frequency
  • G Goavec-Merou FEMTO-ST Time & Frequency

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.

Published
2023-09-14
How to Cite
FRIEDT, J M; GOAVEC-MEROU, G. Time of flight measurement with sub-sampling period resolution using Software Defined Radio. Proceedings of the GNU Radio Conference, [S.l.], v. 8, n. 1, sep. 2023. Available at: <https://pubs.gnuradio.org/index.php/grcon/article/view/142>. Date accessed: 22 july 2024.