# US 9,435,907 B2 · Phase synchronized buried object locator apparatus, systems, and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,907 B2 - Document ID: US9435907B2 - Status: Granted - Kind: B2 - Application number: 13/570,211 - Filed: 2012-08-08 - Published: 2013-08-08 - Granted: 2016-09-06 - Earliest claimed: 2011-08-08 - Assignees: Seescan, Inc. - Applicants: Mark S. Olsson; Ray Merewether; David A. Cox; Jan Soukup; Timothy M. Turner - Inventors: Mark S. Olsson; Ray Merewether; David A. Cox; Jan Soukup; Timothy M. Turner - Web page: https://patentgrep.com/patent/US9435907B2 ## CPC - G01V 3/165: operating with magnetic or electric fields produced or modified by the object or by the detecting device (with electromagnetic waves G01V3/17) - G01S 19/13: Receivers - G01V 3/02: operating with propagation of electric current - G01V 3/081: {the magnetic field is produced by the objects or geological structures (characterised by the method of magnetic field measurement G01R33/00)} - G01V 3/104: {using several coupled or uncoupled coils (G01V3/101 takes precedence)} - G01V 3/12: operating with electromagnetic waves {(operating with millimetre waves G01V8/005)} - G01V 15/00: Tags attached to, or associated with, an object, in order to enable detection of the object (record carriers for use with machines having a detectable tag or marker G06K19/00) - H04W 4/029: Location-based management or tracking services - G01V 3/04: using DC - G01V 3/06: using AC - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Buried object locator systems including transmitters and associated buried object locators using phase-synchronized signals are disclosed. A transmitter may generate output current signals that are phase-synchronized such that an associated locator may receive magnetic field signals from the output current signal and determine information about the current flow based on independent phase-synchronization timing information. ## Claims ### Claim 1 A method for use in a buried object locator system, comprising: receiving a transmitted signal, including timing information, at a buried object locator system transmitter; generating a timing reference from the timing information at the buried object locator system transmitter; generating a phase-synchronized output signal having a phase determined at least in part by the timing reference at the buried object locator system transmitter; sending the output signal from the buried object locator system transmitter to a coupling device to generate a buried object current; receiving a magnetic field signal associated with the buried object current at a buried object locator; determining information about the buried object current based at least in part on the phase of the magnetic field signal; and independently determining a second timing reference at the locator system, wherein the information about the buried object current is based in part on the second timing reference. ### Claim 2 (depends on 1) The method of claim 1, wherein the transmitted signal is a Global Positioning Satellite (GPS) system signal. ### Claim 3 (depends on 1) The method of claim 1, wherein the transmitted signal is a terrestrially generated signal. ### Claim 4 (depends on 1) The method of claim 1, wherein the information about the buried object current includes information about an indicated direction of flow of the buried object current relative to an orientation of the locator. ### Claim 5 (depends on 4) The method of claim 4, further comprising providing a graphical display of the indicated direction of flow of the buried object current on a GUI display of the locator. ### Claim 6 (depends on 1) The method of claim 1, wherein the determining a second timing reference comprises: receiving a second transmitted signal including second timing information; and determining the second timing reference based on the second timing information. ### Claim 7 (depends on 6) The method of claim 6, wherein the second transmitted signal is a Global Positioning Satellite (GPS) system signal. ### Claim 8 (depends on 6) The method of claim 6, wherein the second transmitted signal is a terrestrially generated signal. ### Claim 9 A method for use in a buried utility locator system, comprising: receiving a magnetic field signal associated with a current in a buried object, wherein the magnetic field signal is generated with a phase based at least in part on a first timing reference determined from a first transmitted signal including first timing information; receiving a second transmitted signal including second timing information; determining a second timing reference from the second timing information; and determining information related to the current in the buried object based on the received magnetic signal and second timing reference. ### Claim 10 (depends on 9) The method of claim 9, wherein the information related to a current relates to a phase of the current. ### Claim 11 (depends on 9) The method of claim 9, wherein the information related to a current relates to an indicated direction of current flow. ### Claim 12 (depends on 9) The method of claim 9, wherein the first and second transmitted signals are Global Positioning Satellite (GPS) system signals. ### Claim 13 (depends on 9) The method of claim 9, wherein the first and second transmitted signals are cellular system signals. ### Claim 14 (depends on 9) The method of claim 9, wherein the output signal is coupled to a buried object. ### Claim 15 (depends on 9) The method of claim 9, further comprising providing a display of an indicated direction of current flow in the buried object. ### Claim 16 (depends on 9) The method of claim 9, wherein the magnetic field signal is synchronously detected based on the received timing information. ### Claim 17 A locator for use in a buried utility locator system, comprising: a locator receiver module for receiving a magnetic field signal from a buried object associated with a current in the buried object, wherein the magnetic field signal is generated with a phase based at least in part on a first timing reference determined from a first transmitted signal including first timing information; a timing synchronization module including a receiver module configured to receive a second transmitted signal that includes second timing information and determine a second timing reference from the second timing information; and a processing module configured to determine information related to the current in the buried object based on the received magnetic signal and the second timing reference. ### Claim 18 (depends on 17) The locator of claim 17, further comprising a display module configured to display the information related to a current. ### Claim 19 (depends on 18) The locator of claim 18, wherein the information related to the current includes current phase. ### Claim 20 (depends on 19) The locator of claim 19, wherein the information related to a the current includes an indicated direction of current flow in the buried object. ### Claim 21 (depends on 17) The locator of claim 17, wherein the locator is configured to synchronously detect the magnetic field signal emission based at least in part on the second timing information. ### Claim 22 A system including a first non-transitory computer readable medium including instructions for causing a computer to: receive a first transmitted signal that includes timing information; determine a timing reference from the timing information; generate an output signal having a phase determined at least in part by the timing reference; and send the output signal to a coupling apparatus; and a second non-transitory computer readable medium including instructions for causing a computer to: receive a magnetic signal associated with a current in a buried object, wherein the magnetic signal is generated with a phase based at least in part on a first timing reference determined from a first transmitted signal including first timing information; receive a second transmitted signal including second timing information; determine a second timing reference from the second timing information; and determine an indicated current direction in a buried object based on the received locator signal and the second timing reference.