公开(公告)号：US11175691B1

公开(公告)日：2021-11-16

申请号：US17076078

申请日：2020-10-21

Applicant: NXP B.V.

Inventor： Jacek Tyminski ,  Wolfgang Kuchler ,  Georg Burgler ,  Sandeep Mallya ,  Pradeep Kumar Aithagani ,  Chinmay Gururaj Kathani

IPC: G06F1/04 ,  G06F1/14 ,  G01S13/08 ,  H03L7/099

Abstract: A method for optimizing power of a ranging sequence includes counting at least one cycle of a first clock during a Crystal Oscillator (XO)-mode to generate a first cycle count. A second clock is activated at an end of the XO-mode. The first cycle count is converted into a fractional correction value by multiplying the first cycle count by a ratio of a second period of the second clock divided by a first period of the first clock. A first alignment of the first clock to the second clock is determined at a beginning of the XO-mode. A second alignment of the first clock to the second clock is determined at the end of the XO-mode. An adjusted cycle count is determined by summating the fractional correction value with a summation of the first alignment and the second alignment divided by the first period.

公开(公告)号：US11546766B2

公开(公告)日：2023-01-03

申请号：US16571412

申请日：2019-09-16

Applicant: NXP B.V.

Inventor： Wolfgang Kuchler ,  Jan Dutz

IPC: H04L25/02 ,  H04W12/122 ,  G06F17/18

Abstract: A method for first path acceptance for secure ranging includes determining a Channel Impulse Response (CIR) of a communication channel for a plurality of channel taps. Each channel tap corresponds to a respective one of a plurality of time slots of the CIR, wherein the CIR includes a plurality of estimated CIR values. A statistical characteristic is extracted from the estimated CIR values within a temporal range of the channel taps. The statistical characteristic is compared to a reference value to detect a distance decreasing attack.

公开(公告)号：US20210084499A1

公开(公告)日：2021-03-18

申请号：US16571412

申请日：2019-09-16

Applicant: NXP B.V.

Inventor： Wolfgang Kuchler ,  Jan Dutz

IPC: H04W12/12 ,  H04L25/02

Abstract: A method for first path acceptance for secure ranging includes determining a Channel Impulse Response (CIR) of a communication channel for a plurality of channel taps. Each channel tap corresponds to a respective one of a plurality of time slots of the CIR, wherein the CIR includes a plurality of estimated CIR values. A statistical characteristic is extracted from the estimated CIR values within a temporal range of the channel taps. The statistical characteristic is compared to a reference value to detect a distance decreasing attack.