An antenna device, a positioning system and a positioning method are provided. The positioning method includes: dispersedly arranging a plurality of receivers to form a target area, in which each of the receivers includes the antenna device; receiving a wireless signal from the target area through the antenna device, and generating a difference signal strength and a sum signal strength; calculating, for each of the receivers, a sum-difference ratio between the difference signal strength and the sum signal strength, and estimating a corresponding one of estimated incident angles according to the sum-difference ratio and a comparison table; executing, in response to obtaining the estimated incident angles corresponding to the receivers, a positioning algorithm according to the estimated incident angles, so as to generate a plurality of possible positions; and executing an optimization algorithm to calculate a best estimated position of the possible positions.

The present disclosure obtains a correction value that corrects measurement angle error signals more accurately than conventional methods even in a case where a radio wave signal-to-noise ratio is low, and thus tracks a communication counterpart more accurately than the conventional methods. The present disclosure includes a program controller 28 that generates a command value of an orientation direction of an antenna 1 and outputs the generated command value to an antenna drive controller 27, the command value being changed in accordance with a predetermined change scenario 54; a correction value calculator 32 that calculates a phase correction value γ, based on at least three pieces of error measurement data 55 including (i) an arrival direction error obtained from a sum signal and a difference signal of reception signals, the arrival direction error representing a difference between the orientation direction and an arrival direction being a direction from which the radio waves come and arrive and (ii) an orientation direction actual measurement value being an actual measurement value of the orientation direction when the arrival direction error is obtained, the phase correction value γ being an angle by which the arrival direction error is rotated; and a tracking controller 33 that outputs, to the antenna drive controller 27, as the command value, a value obtained by adding the arrival direction error corrected based on the phase correction value γ to the orientation direction actual measurement value.

A stacked patch antenna array includes: a conductive ground plane configured to connect to a plurality of electrical transmission lines for transmitting and/or receiving electrical signals; a driven layer adjacent to the conductive ground plane formed of a dielectric material and comprising a plurality of first resonant circular patches, each electrically connecting to a respective electrical transmission line such that a received electrical signal excites and generates an electromagnetic signal and/or a received electromagnetic signal excites and generates an electrical signal; an electrically insulating spacer adjacent to the driven layer; and a coupled layer adjacent to the electrically insulating spacer formed of a dielectric material and comprising a plurality of second resonant circular patches which are symmetrically positioned with respect to the first circular resonant patches of the driven layer and excited by the electromagnetic waves generated by the first resonant circular patches, wherein the electrically insulating spacer electrically separates the driven layer and the coupled layer having a thickness such that the resonances of the first and second resonant circular patches constructively combine.

A method and system facilitate communication between a constellation of satellites and a mobile platform-mounted mobile communicator. The method and system may include the use of a first antenna suited for operation using a first frequency band in a first geographic region and a second antenna suited for operation using either the first or a second frequency band in a second geographic region. The method and system may use a controller to determine which antenna to activate based on one or more of a geographic indicator or a signal indicator. The system used by the method to facilitate the communication may have one or more enclosures over the antennas and controller for mounting to a mobile platform.

A method and system facilitate communication between a constellation of satellites and a mobile platform-mounted mobile communicator. The method and system may include the use of a first antenna suited for operation using a first frequency band in a first geographic region and a second antenna suited for operation using either the first or a second frequency band in a second geographic region. The method and system may use a controller to determine which antenna to activate based on one or more of a geographic indicator or a signal indicator. The system used by the method to facilitate the communication may have one or more enclosures over the antennas and controller for mounting to a mobile platform.

A stacked patch antenna array includes: a conductive ground plane configured to connect to a plurality of electrical transmission lines for transmitting and/or receiving electrical signals; a driven layer adjacent to the conductive ground plane formed of a dielectric material and comprising a plurality of first resonant circular patches, each electrically connecting to a respective electrical transmission line such that a received electrical signal excites and generates an electromagnetic signal and/or a received electromagnetic signal excites and generates an electrical signal; an electrically insulating spacer adjacent to the driven layer; and a coupled layer adjacent to the electrically insulating spacer formed of a dielectric material and comprising a plurality of second resonant circular patches which are symmetrically positioned with respect to the first circular resonant patches of the driven layer and excited by the electromagnetic waves generated by the first resonant circular patches, wherein the electrically insulating spacer electrically separates the driven layer and the coupled layer having a thickness such that the resonances of the first and second resonant circular patches constructively combine.

The radio system (10) comprises a waveform generator (1) alternately generating an FMCW wave representing a linearly frequency-modulated continuous wave for radar imaging and a CW wave representing a wave kept at a given frequency for measuring a velocity vector, an amplification chain (2), a set (4) of transmit antennas (41, 42, 43), a set (5) of receive antennas (51, 52, 531, 532), a set (7) of receivers (71-2, 731, 732), and a signal processor (9) implementing processing operations on FMCW signals received from the one or more lateral antennas (51, 52) of the set (5) of receive antennas (51, 52, 531, 532) and spectrally analysing CW signals received from the one or more lateral antennas (51, 52) and from the one or more ventral antennas (531, 532) of the set (5) of receive antennas (51, 52, 531, 532) so as to supply SAR images and components of the velocity vector of said airborne vehicle (20).

A low sidelobe beam forming method and dual-beam antenna schematic are disclosed, which may preferably be used for 3-sector and 6-sector cellular communication system. Complete antenna combines 2-, 3- or -4 columns dual-beam sub-arrays (modules) with improved beam-forming network (BFN). The modules may be used as part of an array, or as an independent 2-beam antenna. By integrating different types of modules to form a complete array, the present invention provides an improved dual-beam antenna with improved azimuth sidelobe suppression in a wide frequency band of operation, with improved coverage of a desired cellular sector and with less interference being created with other cells. Advantageously, a better cell efficiency is realized with up to 95% of the radiated power being directed in a desired cellular sector.

A method and system facilitate communication between a constellation of satellites and a mobile platform-mounted mobile communicator. The method and system may include the use of a first antenna suited for operation using a first frequency band in a first geographic region and a second antenna suited for operation using either the first or a second frequency band in a second geographic region. The method and system may use a controller to determine which antenna to activate based on one or more of a geographic indicator or a signal indicator. The system used by the method to facilitate the communication may have one or more enclosures over the antennas and controller for mounting to a mobile platform.

A method and system facilitate communication between a constellation of satellites and a mobile platform-mounted mobile communicator. The method and system may include the use of a first antenna suited for operation using a first frequency band in a first geographic region and a second antenna suited for operation using either the first or a second frequency band in a second geographic region. The method and system may use a controller to determine which antenna to activate based on one or more of a geographic indicator or a signal indicator. The system used by the method to facilitate the communication may have one or more enclosures over the antennas and controller for mounting to a mobile platform.