Radio Sensor Gate Drive Code Inheritance via Modulation Segmentation
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Solution Overview
Problem
Existing radio transmitters for door operators have complex structures and are vulnerable to manipulation, with threshold value circuits complicating the design and allowing potential unauthorized code inheritance over long distances.
Innovation Solution
A radio transmitter design that transmits remote control signals in frequency modulation and inheritance signals in amplitude modulation, allowing for a simpler structure with reduced manipulation possibilities, where the inheritance process is initiated at the transmitting radio transmitter, and the receiver is only capable of receiving amplitude-modulated signals, eliminating the need for a frequency-modulated receiving device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bidirectional transceiver with threshold value circuit is used for code inheritance, then code inheritance functionality is achieved, but device complexity increases and manipulation vulnerability increases
Solution Approach 1:
The patent segments the transmission function into two distinct modes: frequency modulation for normal remote control operations and amplitude modulation for code inheritance operations. This segmentation allows the transmitter to use simple unidirectional transmission hardware while achieving complex bidirectional functionality through protocol differentiation, thereby reducing device complexity while maintaining adaptability.
Solution Approach 2:
Instead of having the receiving device perform the complex task of detecting both FM and AM signals and determining transmission direction, the patent inverts the approach by having the transmitting device switch between FM and AM modes. This inversion simplifies the receiving device to a simple AM receiver while achieving the same functional outcome, thereby reducing overall system complexity.
2Reliability
If threshold value circuit is used to limit transmission distance, then manipulation is prevented, but device complexity increases
Solution Approach 1:
The patent changes the transmission parameter from frequency modulation to amplitude modulation during code inheritance operations. This parameter change inherently limits the transmission distance because AM signals are more susceptible to environmental interference and signal degradation over distance compared to FM signals. This achieves security against manipulation without requiring additional threshold value circuits, thereby maintaining reliability while reducing device complexity.
3Device complexity
If unidirectional transmitter with simple receiving device is used, then device complexity is reduced, but transmission range is limited
Solution Approach 1:
The patent makes the transmission device dynamic by allowing it to switch between frequency modulation and amplitude modulation modes based on the operational requirement. During normal operations, FM mode provides long transmission range, while during code inheritance, AM mode provides limited range for security. This dynamic switching resolves the contradiction between simplicity and transmission range by adapting the transmission characteristics to the specific task at hand.
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
This design achieves a high level of security with a simpler structure, allowing secure code transmission and inheritance between identical radio transmitters while limiting the transmission range to prevent unauthorized access, thus enhancing safety and reducing complexity.
Implementation Method 1
the transmission device is designed to emit the at least one remote control signal in frequency modulation
Implementation Method 2
to emit the at least one inheritance signal in amplitude modulation
Data Source
AI summary
The invention relates to a radio transmitter (10, 10a, 10b) for remotely controlling a gate drive, comprising a transmitter (26), which is designed to transmit at least one remote control signal (20) encoded by means of a signal code for remotely controlling the gate drive and for transmitting at least one inheritance signal (40) for passing the signal code to a second radio transmitter (10b). In order to create a simple yet secure radio transmitter (10, 10a, 10b), according to the invention the transmitter (26) is designed to transmit the at least one remote control signal (20) in frequency modulation and to transmit the at least one inheritance signal (40) in amplitude modulation. The invention further relates to a gate drive system comprising at least two such radio transmitters (10a, 10b) and to an inheritance and operating method which can be carried out by the radio transmitters.