Slotted Waveguide Vehicle Link With Dynamic Attenuation Control
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Solution Overview
Problem
Existing communication systems using slotted waveguides for vehicle-to-fixed station communication are limited by the maximum transmission path length due to signal overload and noise immunity requirements, restricting the bandwidth and range.
Innovation Solution
Incorporating an adjustable attenuation unit between the vehicle's antenna and transmitting/receiving device, controlled by signal power or vehicle position, to optimize signal strength and prevent overload, allowing for increased transmission path length and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If transmission power is increased to extend communication range, then maximum transmission path length is improved, but receiver overload occurs at minimal distance causing interference or damage
Solution Approach 1:
The patent applies dynamics by making the attenuation value changeable based on vehicle position. The attenuation unit dynamically adjusts its attenuation characteristic according to the distance between vehicle and fixed station, using position information from the control device to optimize signal levels at different ranges, thereby extending communication path length while preventing receiver overload.
Solution Approach 2:
The patent changes the parameter of attenuation from a fixed value to a variable value that depends on position. By adjusting the attenuation parameter based on distance measurements or position data, the system adapts signal strength to match transmission path length requirements without causing receiver damage at close distances.
2Reliability
If transmission power is increased to ensure noise-immune transmission at maximum distance, then signal-to-noise ratio is improved, but receiver overload occurs at minimal distance
Solution Approach 1:
The system dynamically adjusts attenuation based on real-time position information. When the vehicle is far from the fixed station, lower attenuation maintains good signal-to-noise ratio. When the vehicle approaches, higher attenuation prevents receiver overload, thus maintaining reliability across all distances.
Solution Approach 2:
The control device provides position feedback to the attenuation unit, enabling closed-loop control of signal levels. This feedback mechanism ensures that attenuation is continuously optimized based on actual transmission conditions, maintaining both signal quality and receiver safety.
3Device complexity
If fixed attenuation is used between transmitter and antenna, then device complexity is reduced, but maximum transmission path length is limited due to inability to prevent receiver overload
Solution Approach 1:
The control device performs multiple functions: it controls vehicle movement along the guideway and simultaneously provides position information for attenuation adjustment. This multi-functionality avoids adding dedicated complexity while enabling dynamic attenuation control to extend transmission path length.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adjustable attenuation unit extends the communication range by dynamically adjusting signal power, ensuring noise-free transmission and preventing receiver overload, thereby enhancing the maximum transmission path length and maintaining signal quality.
Implementation Method 1
an antenna (3) arranged on a vehicle (4) so that it projects through a slot (2) into the cavity of a waveguide (1) and can receive and/or transmit electromagnetic waves propagating along the waveguide
Implementation Method 2
an attenuation unit with adjustable attenuation is connected between the antenna of the vehicle and a transmitting and receiving device of the vehicle
Data Source
AI summary
In a communications system for communication between a vehicle guided along a predefined movement path and a stationary station using a slotted waveguide which extends parallel to the movement path of the vehicle and into which at least one antenna connected to a transceiver unit of the stationary station and at least one antenna of the vehicle project, wherein the antenna of the vehicle is moved in the longitudinal direction of the slotted waveguide with a movement of the vehicle, a switching device is arranged between the antenna of the vehicle and a transceiver unit of the vehicle, by means of which the antenna can be selectively connected to the transceiver unit of the vehicle either directly or via at least one interconnected attenuation element. The switching device can be actuated by the control device of the vehicle according to the power of a received signal.