A microwave-doppler detecting module and device thereof are provided, wherein the microwave-doppler detecting module includes an electromagnetic reflecting surface and at least a pair of antithetical dipoles spacingly disposed to the electromagnetic reflecting surface. When the first and second radiating source poles respectively extended from a first and second feed ends of the pair of antithetical dipoles are respectively fed by the same excitation signal feed source at the first feed end and the second feed end, the current and the potential distribution of the first radiating source pole and the second radiating source pole can present an antithetical distribution state and antithetically coupled to the midpoint of the connection of the first feed end and the second feed end, so as to reduce the size requirement of the microwave-doppler detecting module and to avoid detection dead zone from occurring.

A microwave-doppler detecting module and device thereof are provided, wherein the microwave-doppler detecting module includes an electromagnetic reflecting surface and at least a pair of antithetical dipoles spacingly disposed to the electromagnetic reflecting surface. When the first and second radiating source poles respectively extended from a first and second feed ends of the pair of antithetical dipoles are respectively fed by the same excitation signal feed source at the first feed end and the second feed end, the current and the potential distribution of the first radiating source pole and the second radiating source pole can present an antithetical distribution state and antithetically coupled to the midpoint of the connection of the first feed end and the second feed end, so as to reduce the size requirement of the microwave-doppler detecting module and to avoid detection dead zone from occurring.

A low-altitude frequency domain electromagnetic detection device and an electromagnetic detection method are disclosed. A transmitting wireframe, a receiving wireframe I, a transmitting and receiving system and a receiving wireframe II of the detection device are connected with supporting rods at intervals, and the supporting rods are connected with an unmanned aerial vehicle. A sine wave generation module of the transmitting and receiving system is connected with the transmitting wireframe, the receiving wireframes I and II are connected with a dual-channel synchronous data acquisition module, and the dual-channel synchronous data acquisition module is connected with a main control module. The main control module controls the sine wave generation module, receives data of an altimeter, a GNSS module and the dual-channel synchronous data acquisition module and records the data in a storage module. The electromagnetic detection method comprises equipment assembly, coefficient calibration, data acquisition and normalized secondary field calculation.

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 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 pop-up HF antenna system includes a primary UAS associated with a feed point of the pop-up HF antenna. The primary UAS has a first input configured to receive an RF signal and a second input configured to receive a DC power signal. At least one secondary UAS are associated with an endpoint of the pop-up HF antenna. a pair of wires is configured to interconnect the primary UAS to the at least one secondary UAS and to provide the DC power signal and the RF signal from the primary UAS to the at least one secondary UAS. At least one antenna interface circuit located at the primary UAS and configured to connect the primary UAS to the pair of wires and to combine the DC power signal and the RF signal. The pair of wires is configured to provide simultaneous differential-mode DC transmission and common-mode RF transmission.

An HF antenna system is provided. The HF antenna system includes an airborne antenna positioning unit and computes an optimal antenna orientation and length based on relevant wave propagation data to position the antenna for maximal transmission and reception. In one embodiment, the HF antenna system includes an antenna base and control unit (ABCU) and an antenna positioning unit (APU). The ABCU is connected to the APU by an antenna wire. The antenna wire is retractable within the ABCU and is adjustable via positioning of the APU. The APU is an airborne device, such that the APU is tethered to the ABCU but can hoist the terminal end of the antenna wire with complete positional freedom relative to the ABCU.