Frequency Hopping Controller for Radio Controlled Model Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Radio controlled model apparatuses employing frequency hopping spread spectrum communication face interference issues due to shared radio zones, where controllers may not detect occupied zones effectively, leading to potential loss of control or unauthorized control of other aircraft.
Innovation Solution
A controller with a radio zone use detector that checks an initial zone's occupancy and sequentially searches for an unoccupied zone, updating its memory before use, to selectively transmit through an unoccupied zone, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single frequency hopping pattern is used for radio zone communication, then the communication system is simple and easy to implement, but radio zone interference occurs when multiple controllers share the same frequency range
Solution Approach 1:
The patent segments the frequency hopping pattern into multiple independent patterns (first pattern and second pattern). The controller can selectively switch between these segmented patterns based on detection results, allowing different radio zones to use different patterns and thereby avoiding interference while maintaining system simplicity.
Solution Approach 2:
The patent introduces dynamic selection capability where the controller can dynamically choose between the first frequency hopping pattern and the second frequency hopping pattern based on whether interference is detected. This dynamic adaptation allows the system to maintain simplicity when no interference exists while gaining interference resistance when needed.
2Reliability
If the controller detects occupied radio zones and switches to unoccupied zones, then radio zone interference is reduced, but the device complexity increases due to detection and switching mechanisms
Solution Approach 1:
The patent implements preliminary detection of radio zone occupancy before establishing communication. The controller detects whether the initial radio zone is occupied and preliminarily selects an appropriate frequency hopping pattern before actual control begins, preventing interference rather than reacting to it.
Solution Approach 2:
The patent changes the parameter of frequency hopping pattern selection based on detection results. When the initial radio zone is unoccupied, the controller uses the first frequency hopping pattern; when occupied, it switches to the second frequency hopping pattern. This parameter change approach maintains reliability while controlling complexity through systematic pattern selection.
3Ease of operation
If controllers use default initial radio zones, then the operation is simple and fast, but interference occurs when multiple controllers occupy the same zone simultaneously
Solution Approach 1:
The patent performs preliminary detection of the initial radio zone's occupancy status before the controller begins operation. This preliminary action maintains operational simplicity by using a default initial zone while adding a detection step to ensure no collision occurs, thus resolving the contradiction between ease of operation and reliability.
Data Source
AI summary
A technique is provided that can avoid radio zone interference in a radio controlled model apparatus which employs a frequency hopping system in the spread spectrum radio techniques. In a controller for maneuvering, for example, model airplanes, a process for detecting whether or not a radio zone is in an occupied state is initiated, with an initial radio zone represented by information stored in a nonvolatile memory acting as a starting point. Until an unoccupied radio zone is detected, the process of detecting the occupation of radio zones continues according to a predetermined sequence. Thus, an available radio zone can be detected. Moreover, information representing an initial radio zone, stored in a nonvolatile memory, is updated immediately after power-on of the controller.