# US 10,484,957 B2 · Systems and methods for indoor positioning using wireless positioning nodes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,957 B2 - Document ID: US10484957B2 - Status: Granted - Kind: B2 - Application number: 16/024,399 - Filed: 2018-06-29 - Published: 2018-10-25 - Granted: 2019-11-19 - Earliest claimed: 2017-03-16 - Assignees: Lonprox Corporation - Applicants: Lonprox Corporation - Inventors: Saed Younis - Web page: https://patentgrep.com/patent/US10484957B2 ## CPC - G01S 5/145: {Using a supplementary range measurement, e.g. based on pseudo-range measurements} - H04W 64/00: Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management - G01S 5/0236: {Assistance data, e.g. base station almanac} - G01S 5/10: Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements {, e.g. omega or decca systems}(G01S5/12 takes precedence {; beacons and receivers cooperating therewith G01S1/306, G01S1/308}) - H04W 4/33: for indoor environments, e.g. buildings - H04W 4/02: Services making use of location information - H04W 56/001: {Synchronization between nodes} - 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 This disclosure provides systems and methods for determining a location of a mobile device within an indoor environment. An embodiment of the system can have one or more positioning nodes (PONs), each having one or more antennas. Each PON can be disposed at a location within indoor environment and configured to transmit signals via the one or more antennas. The signals transmitted from the antennas of the PONs can be synchronized in time and frequency. A server communicatively coupled to the PONs and storing aiding information, including location and signal information related to the PONs, can transmit the aiding information to a mobile device. The mobile device can receive the signals from use the PONs and use the aiding information to determine a three dimensional position within the indoor environment based on one-way time difference of arrival of the signals. ## Claims ### Claim 1 A system for determining a location of a mobile device within an indoor environment, the system comprising: a first positioning node (PON) configured to transmit a first modulated signal; a second PON disposed in a different location than the first PON and configured to transmit a second modulated signal; and a server configured to receive a request from the mobile device indicating a coarse location of the mobile device, transmit location information for the first PON and the second PON based on the request, and signal information related to the first modulated signal and the second modulated signal; and receive a position report from the mobile device, the position report being based on a difference in time between the first modulated signal and the second modulated signal at a time of arrival at the mobile device. ### Claim 2 (depends on 1) The system of claim 1 wherein the second modulated signal is synchronized in time and frequency with the first modulated signal at a time of transmission. ### Claim 3 (depends on 1) The system of claim 1 wherein the first PON and the second PON are collocated with a containing device, the containing device being an in-home electronic device. ### Claim 4 (depends on 2) The system of claim 2 wherein the first modulate signal and the second modulated signal are transmitted below an ultra-wideband (UWB) mask set for indoor UWB transmissions. ### Claim 5 (depends on 1) The system of claim 1 wherein the first modulated signal and the second modulated signal are direct sequence spread spectrum (DSSS) signals separated by at least one spreading chip. ### Claim 6 (depends on 1) The system of claim 1 wherein the first PON and the second PON are collocated within a single containing device. ### Claim 7 (depends on 1) The system of claim 1 wherein the first PON and the second PON are disposed within different containing devices. ### Claim 8 (depends on 7) The system of claim 7 wherein the first PON and the second PON are coupled to a common power main and are configured to synchronize the first modulated signal and the second modulated signal based on a frequency of the common power main. ### Claim 9 (depends on 8) The system of claim 8 wherein, the first PON is further configured to transmit a first timing signal via the power main; the second PON is further configured to transmit a second timing signal via the power main, the first timing signal and the second timing signal having a frequency several orders of magnitude the frequency of the common power main; the first PON is further configured to adjust a local reference oscillator based on the second timing signal and one or more received other timing signals; and the second PON is further configured to adjust a local reference oscillator based on the first timing signal and the one or more received other timing signals. ### Claim 10 (depends on 1) The system of claim 1 wherein the first PON and the second PON are configured to: receive one or more other modulated signals; determine a frequency and time offset between a respective one of the first modulated signal and the second modulated signal and the one or more other modulated signals; and adjust a frequency of the respective one of the first modulated signal and the second modulated signal to synchronize frequency and time with the one or more other modulated signals. ### Claim 11 (depends on 1) The system of claim 1 wherein the first modulated signal and the second modulated are transmitted intermittently at the respective first PON and second PON. ### Claim 12 A method for determining a location of a mobile device within an indoor environment, the method comprising: transmitting, by a first positioning node (PON), a first modulated signal; transmitting, by a second PON disposed in a different location than the first PON, a second modulated signal ; receiving, at a server, a request from the mobile device indicating a coarse location of the mobile device; transmitting, by the server, location information related to first PON and the second PON based on the request, and signal information related to the first modulated signal and the second modulated signal; and receiving, at the server, a position report from the mobile device, the position report being based on a difference in time between the first modulated signal and the second modulated signal at a time of arrival at the mobile device. ### Claim 13 (depends on 12) The method of claim 12 wherein the second modulated signal is synchronized in time and frequency with the first modulated signal at a time of transmission. ### Claim 14 (depends on 12) The method of claim 12 wherein the first PON and the second PON are collocated with a containing device, the containing device being an in-home electronic device. ### Claim 15 (depends on 12) The method of claim 12 wherein the first modulated signal and the second modulated signal are direct sequence spread spectrum (DSSS) signals separated by at least one spreading chip. ### Claim 16 (depends on 12) The method of claim 12 wherein the first PON and the second PON are coupled to a common power main and are configured to synchronize the first modulated signal and the second modulated signal based on a frequency of the common power main. ### Claim 17 (depends on 16) The method of claim 16 wherein, the first PON is further configured to transmit a first timing signal via the power main; the second PON is further configured to transmit a second timing signal via the power main, the first timing signal and the second timing signal having a frequency several orders of magnitude the frequency of the common power main; the first PON is further configured to adjust a local reference oscillator based on the second timing signal and one or more received other timing signals; and the second PON is further configured to adjust a local reference oscillator based on the first timing signal and the one or more received other timing signals. ### Claim 18 A method for determining a location of a mobile device within an indoor environment having one or more positioning nodes (PONs), the method comprising: determining, at a mobile device, a coarse location of the indoor environment; transmitting a request to a server including the coarse location; receiving aiding information from the server based on the coarse location; receiving a first positioning signal from a first antenna; receiving a second positioning signal from a second antenna, the second positioning being out of phase with the first positioning signal; receiving a third positioning signal from a third antenna, the third positioning signal being out of phase with the first positioning signal and the second positioning signal; and determining a position of the mobile device based on a one-way time-difference of arrival (TDOA) between the first positioning signal, the second positioning signal, and the third positioning signal. ### Claim 19 (depends on 18) The method of claim 18, wherein the first positioning signal, the second positioning signal, and the third positioning signal are transmitted using direct sequence spread spectrum (DSSS). ### Claim 20 (depends on 18) The method of claim 18, wherein the first antenna, the second antenna, and the third antenna are collocated within the same PON.