# US 10,371,783 B2 · Direction finding antenna format > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,783 B2 - Document ID: US10371783B2 - Status: Granted - Kind: B2 - Application number: 14/828,679 - Filed: 2015-08-18 - Published: 2016-02-18 - Granted: 2019-08-06 - Earliest claimed: 2014-08-18 - Assignees: Mediatek Inc. - Applicants: Mediatek Inc. - Inventors: James June-Ming Wang; Kai-Chun Chou; Ching-Hwa Yu; Hsuan-Yu Liu - Web page: https://patentgrep.com/patent/US10371783B2 ## CPC - G01S 3/74: Multi-channel systems specially adapted for direction-finding, i.e. having a single antenna system capable of giving simultaneous indications of the directions of different signals (systems in which the directions of different signals are determined sequentially and displayed simultaneously G01S3/04, G01S3/14) - G01S 3/02: using radio waves - G01S 3/043: {Receivers} - G01S 5/02: using radio waves (using satellite radio beacon systems for determining position G01S19/00) - G01S 5/0284: {Relative positioning} - G01S 1/0428: {Signal details} - G01S 1/08: Systems for determining direction or position line - G01S 3/14: Systems for determining direction or deviation from predetermined direction {(aerial arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00; combinations of different interacting aerial units for giving a desired directional characteristic H01Q21/29; aerials or aerial systems providing at least two radiation patterns H01Q25/00)} - G01S 3/42: the desired condition being maintained automatically - G01S 3/46: using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems - G01S 5/0247: {Determining attitude} - G01S 5/12: by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial - 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 ## Abstract A method of direction finding (DF) positioning based on a simplified antenna platform format in a wireless communication network is proposed. A receiver receives antenna platform format information of a transmitter having multiple antenna elements. The antenna platform format information comprises an antenna platform format indicator, antenna platform position and orientation information, a number of antenna elements, and switching delay, phase center, and polarization information for each antenna element. The receiver receives a plurality of direction finding sounding signals transmitted from the transmitter via the multiple antenna elements. The receiver performs a DF algorithm based on the plurality of DF sounding signals and the antenna platform format information and thereby estimating a DF solution. Finally, the receiver determines its own location information based on the estimated DF solution. ## Claims ### Claim 1 A method comprising: receiving antenna platform format information of a transmitting device having multiple antenna elements, wherein the antenna platform format information comprises antenna platform position and orientation information, a number of antenna elements, and phase center and polarization information for each antenna element, wherein the antenna platform format information further comprises an antenna platform format indicator indicating a simplified antenna platform format; receiving a plurality of direction finding (DF) radio signals transmitted from the transmitting device via the multiple antenna elements; estimating a DF solution by performing a DF algorithm by a receiving wireless Bluetooth device based on the plurality of DF radio signals and the antenna platform format information to produce an estimated DF solution; determining location information based on the estimated DF solution. ### Claim 2 (depends on 1) The method of claim 1, wherein the plurality of DF radio signals are transmitted via the multiple antenna elements of the transmitting device, and wherein the DF algorithm is Angle of Departure (AoD). ### Claim 3 (depends on 1) The method of claim 1, wherein the transmitting device is a Bluetooth device applying antenna switching for the DF radio signals. ### Claim 4 (depends on 3) The method of claim 3 further comprising the receiving device receiving switching delay information from the transmitting device. ### Claim 5 (depends on 1) The method of claim 1, wherein the phase center information for each antenna element is represented by one to two octets for each coordinate. ### Claim 6 (depends on 1) The method of claim 1, wherein the polarization information for each antenna element comprises polarization type information and polarization orientation information, and wherein the polarization type information indicates a linear polarization type or a circular polarization type for each antenna element. ### Claim 7 (depends on 6) The method of claim 6, wherein the polarization type information and the polarization orientation information for each antenna element are the same. ### Claim 8 (depends on 1) The method of claim 1, wherein the antenna platform format information does not contain antenna array response for different directions under the simplified antenna platform format. ### Claim 9 (depends on 1) The method of claim 1, wherein the estimating a DF solution comprises the receiving device applying Barlett beamformer or MUSIC algorithm to estimate the DF solution. ### Claim 10 A wireless Bluetooth device, comprising: a radiofrequency (RF) receiver operable to receive antenna platform format information of a transmitting device having multiple antenna elements, wherein the antenna platform format information comprises antenna platform position and orientation information, a number of antenna elements, and phase center and polarization information for each antenna element, and wherein the receiver is also operable to receive a plurality of direction finding (DF) radio signals transmitted from the transmitting device via the multiple antenna elements, wherein the antenna platform format information further comprises an antenna platform format indicator indicating a simplified antenna platform format; and a DF controller operable to estimate a DF solution by performing a DF algorithm based on the plurality of DF radio signals and the antenna platform format information to produce an estimated DF solution, wherein the DF controller also is operable to determine location information of the device based on the estimated DF solution. ### Claim 11 (depends on 10) The device of claim 10, wherein the plurality of DF radio signals are transmitted via the multiple antenna elements of the transmitting device, and wherein the DF algorithm is Angle of Departure (AoD). ### Claim 12 (depends on 10) The device of claim 10, wherein the transmitting device is a Bluetooth device applying antenna switching for the DF radio signals. ### Claim 13 (depends on 12) The device of claim 12, wherein the receiving device is also operable to receive switching delay information from the transmitting device. ### Claim 14 (depends on 10) The device of claim 10, wherein the phase center information for each antenna element is represented by one to two octets for each coordinate. ### Claim 15 (depends on 10) The device of claim 10, wherein the polarization information for each antenna element comprises polarization type information and polarization orientation information, and wherein the polarization type information indicates a linear polarization type or a circular polarization type for each antenna element. ### Claim 16 (depends on 15) The device of claim 15, wherein the polarization type information and the polarization orientation information for each antenna element are the same. ### Claim 17 (depends on 10) The device of claim 10, wherein the antenna platform format information does not contain antenna array response for different directions under the simplified antenna platform format. ### Claim 18 (depends on 10) The device of claim 10, wherein the receiving device is operable to apply Barlett beamformer or MUSIC algorithm to estimate the DF solution.