公开(公告)号：US10236858B1

公开(公告)日：2019-03-19

申请号：US14836462

申请日：2015-08-26

Applicant: HRL LABORATORIES, LLC

Inventor： Logan Sorenson ,  Raviv Perahia ,  Hung Nguyen ,  David Chang

IPC: H03H9/02 ,  H01L41/047 ,  H01L41/113 ,  H03H9/17 ,  H03H9/25 ,  H03F3/45

Abstract: An electromechanical resonator including a drive electrode set having at least one pair of alternating pole interdigitated drive electrodes and including a sense electrode set having at least one pair of alternating pole interdigitated sense electrodes.

公开(公告)号：US20180274355A1

公开(公告)日：2018-09-27

申请号：US15881700

申请日：2018-01-26

Applicant: HRL Laboratories, LLC

Inventor： Keerti S. Kona ,  Logan D. Sorenson ,  Raviv Perahia ,  Hung Nguyen ,  David Chang

IPC: E21B47/04 ,  E21B47/18 ,  E21B47/06

CPC classification number: E21B47/04 ,  E21B47/02208 ,  E21B47/06 ,  E21B47/065 ,  E21B47/18

Abstract: Described is a system for estimating measured depth of a borehole. The system comprises a drilling fluid pulse telemetry system positioned in a borehole and processors connected with the drilling fluid pulse telemetry system. Time series measures are obtained from an environmental sensor package. Initial estimates of a time delay and path attenuation amplitude are determined. An error for the initial estimates is determined, and iterative minimization of the error is performed until source signal parameters converge, resulting in a least squares estimate of the source signal and the reflected signals. The least squares estimate is used to obtain time delay values, which are then used to continuously generate an estimate of a measured depth of the borehole.