×

Asymmetric double-sided two-way ranging in an ultrawideband communication system

  • US 10,488,509 B2
  • Filed: 05/12/2016
  • Issued: 11/26/2019
  • Est. Priority Date: 05/12/2015
  • Status: Active Grant
First Claim
Patent Images

1. An asymmetric double-sided two-way ranging method using three messages, P1, P2, and P3, to complete a pair of round-trip delay measurements between a first device, A, having a first clock, Ca, and a second device, B, having a second clock, Cb, the method comprising the steps of:

  • [1.1] in A, transmitting P1 at a selected point in time T0 relative to Ca;

    [1.2] in B;

    [1.2.1] after an unknown time-of-flight, Tf, receiving P1 at a time T1 relative to Cb; and

    [1.2.2] after a first transmit delay, {circumflex over (D)}b, transmitting P2 at a time T2 relative to Cb;

    [1.3] in A;

    [1.3.1] after a first response delay, {circumflex over (R)}a, relative to T0, receiving P2 at a time T3 relative to Ca; and

    [1.3.2] after a second transmit delay, {circumflex over (D)}a, transmitting P3 at a time T4 relative to Ca; and

    [1.4] in B;

    [1.4.1] after a second response delay, {circumflex over (R)}b, relative to T2, receiving P3 at a time T5 relative to Cb; and

    [1.4.2] developing an estimate, {tilde over (T)}f, of Tf in accordance with a selected one of;

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×