公开(公告)号：US20200225345A1

公开(公告)日：2020-07-16

申请号：US16426779

申请日：2019-05-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： LEI DING ,  Srinath Mathur Ramaswamy ,  Anand Gopalan ,  Vaibhav Garg ,  Anand Ganesh Dabak

IPC: G01S15/10 ,  G01S7/526

Abstract: Ultrasonic ranging systems and methods that use coding to distinguish emitted bursts from multiple transducers temporally stagger the bursts emitted from the transducers. The stagger delay between bursts from different transducers in a sensing frame can be randomized between different sensing frames to prevent blind zones. The stagger delay can be relatively small (e.g., between 3 ms and 10 ms) as compared to delays required between bursts in a single-tone ranging system (which would need to be more on the order of between 30 ms and 40 ms, depending on the maximum detecting range of the ranging system). The coding of bursts can be selected to utilize the entire bandwidth of the bursting transducer so as to preserve short-range sensitivity over transducer ringing. Schemes in which some transducers in a system only listen for bursts from other transducers but do not themselves burst within a sensing frame are also described.