A communication system and method for vehicles, particularly trains, are described with the vehicle having antenna sets. Each antenna set includes a plurality of antennas mounted onto a convex-shaped vehicle roof in which an axis of one antenna set is approximately perpendicular to an axis of another antenna set and in which the antenna sets are mounted below roof level of the convex-shaped vehicle roof A switching device is operable to switch between a first antenna configuration and a second antenna configuration based on a difference in measured signal power received at the antenna sets. The first antenna configuration is associated with a first stationary communication system of the plurality of stationary communication systems and a second antenna configuration is associated with a second stationary communication system of the plurality of stationary communication systems.

A device such as an autonomous mobile device may include an extensible mast or other structure that changes length during operation. A cable between electronics at the ends of the structure includes a data line for signals and a power line for electrical power. A deployed length of the cable is determined and used to determine the phase of an antinoise signal that is radiated using the power line. The antinoise signal destructively interferes with at least a portion of the radiated noise from the data line, reducing the overall amplitude of the radiated noise. The deployed length may also be used to adjust other parameters, such as equalizer settings for one or more of a transmitter or receiver that is connected to the data line.

A wind turbine including a tower and a tower deflection detection device is provided. The tower deflection detection device includes a transmitter configured to transmit a first electromagnetic signal; a leaky feeder having a plurality of apertures; a receiver connected to the first leaky feeder and configured to receive a second electromagnetic signal from the first leaky feeder, the second electromagnetic signal is a signal reflected from a reflection portion of the tower, when the first electromagnetic signal impinges the reflection portion of the tower, and entered into the leaky feeder through at least one of the plurality of apertures; and a processing unit connected to the receiver and configured to receive the second electromagnetic signal from the receiver, to analyse the received second electromagnetic signal and to determine a deflection amount of the tower based on the analysed second electromagnetic signal.

Provided is a signal transmission apparatus for radiation equipment. The signal transmission apparatus includes a first wireless transmission component, the first wireless transmission component includes a first antenna and a second antenna; wherein the first antenna is a loop antenna, and the first antenna is disposed on a gantry in the radiation equipment and is rotatable synchronously with the gantry; and the second antenna is disposed separately from the gantry and is wirelessly connected to the first antenna.

A method of arrangement of a leaky coaxial cable combination structures, comprising: providing at least two leakage coaxial cables, each of the at least two leakage coaxial cables has a narrow body; and providing a jumper wire mechanism between at least two leakage coaxial cables; wherein the jumper wire mechanism has two ends, and the two ends are respectively connected to one end of each of the at least two leakage coaxial cables.

Disclosed is a radiating coaxial cable comprising an inner conductor, an insulating layer surrounding the inner conductor, a conductive shield surrounding the insulating layer and a jacket surrounding the shield. The conductive shield comprises a radiating longitudinal shield portion with radiating apertures and a non-radiating longitudinal shield portion with no radiating apertures. The jacket comprises a first jacket portion facing the radiating shield portion and a second jacket portion facing the non-radiating shield portion. The first jacket portion is thicker than the second jacket portion. This way, the cable is more protected against detrimental effects of metal objects brought near to or in contact with its radiating side.

Methods and systems are provided for enhanced communication cables. A communication cable may include a cable body that includes a first end, a second end, an outer surface, an inner surface, and a channel defined by the inner surface and extending a length between the first end and the second end. The communication cable may further include a communication element located in the channel, an elongate light emitting element extending along at least a portion of the length of the cable body, and a plurality of light transmitting windows spaced periodically along the length of the cable body. The light emitting element may passes through the light transmitting windows. The cable body may include a plurality of opaque sections located between adjacent light transmitting windows, and the light emitting element may passes through the opaque sections. The light transmitting windows may be formed from a light transmitting polymer material.

Implementations are described herein for operating rail-mounted robots in hazardous conditions. In various implementations, a rail-mounted robot configured to inspect a plant with an explosion proof area may include: an actuator to propel the rail-mounted robot along a rail; a battery to provide power to the actuator; a charger to draw power from a power terminal integral with the rail while the rail-mounted robot is in motion, and to charge the battery using the drawn power; and logic to localize the rail-mounted robot based on readings from location indicia distributed along the rail.

Provided is a vehicle antenna to be mounted on a vehicle. The vehicle antenna includes a first antenna portion configured to receive a radio wave signal, the first antenna portion being provided on a roof of the vehicle, and a second antenna portion configured to emit a radio wave signal into the vehicle, the second antenna portion being provided in the vehicle. The first antenna portion is a monopole antenna. The second antenna portion is a flat plate antenna. The first antenna portion and the second antenna portion are electrically connected to each other via a co-axial cable.

Aspects of the subject disclosure may include, a system that facilitates directing a first electromagnetic wave to a device positioned along a transmission medium, the device facilitating a perturbation of the first electromagnetic wave, and the first electromagnetic wave having a first field intensity near an outer surface of the transmission medium, and generating, by the device, a second electromagnetic wave having a second field intensity near the outer surface of the transmission medium that is lower than the first field intensity of the first electromagnetic wave. Other embodiments are disclosed.