US 12,092,718 B2
High-accuracy velocity and range estimation of a moving target using differential Zadoff-Chu codes
Mohammed Hussain Alsharif, Thuwal (SA); Tareq Yousef Alnaffouri, Thuwal (SA); Mohamed Saadeldin, Thuwal (SA); and Mohamed Siala, Aryanah (TN)
Assigned to KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY, Thuwal (SA)
Appl. No. 17/603,401
Filed by KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY, Thuwal (SA)
PCT Filed Apr. 16, 2020, PCT No. PCT/IB2020/053630
§ 371(c)(1), (2) Date Oct. 13, 2021,
PCT Pub. No. WO2020/217146, PCT Pub. Date Oct. 29, 2020.
Claims priority of provisional application 62/836,879, filed on Apr. 22, 2019.
Prior Publication US 2022/0187436 A1, Jun. 16, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04J 13/00 (2011.01); G01S 3/808 (2006.01); G01S 11/14 (2006.01); G01S 15/74 (2006.01)
CPC G01S 11/14 (2013.01) [G01S 3/808 (2013.01); G01S 15/74 (2013.01); H04J 13/0062 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for estimating a range of a moving target, the method comprising:
emitting, from a target, a first ultrasound signal T, wherein the first ultrasound signal T is generated based on a first differential Zadoff-Chu sequence x;
receiving, at a receiver, a second ultrasound signal R, which corresponds to the first ultrasound signal T, wherein the second ultrasound signal R includes a second differential Zadoff-Chu sequence y;
correlating the first ultrasound signal T with the second ultrasound signal R to calculate an initial time of flight estimate τcorr; and
calculating an initial range estimate dcorr by multiplying the initial time of flight estimate τcorr with a speed of sound c,
wherein the first and second differential Zadoff-Chu sequences are different from a Zadoff-Chu sequence as the first and second differential Zadoff-Chu sequences are periodic, with a period of: (1) N if N is odd and not divisible by 3, (2) 3N if N is odd and divisible by 3, (3) 4N if N is even and either (2N−1) or (N−1) is divisible by 3, and (4) 12N otherwise, where N is a length of the first and second differential sequences.