Multi-Frequency HFDL Ground Station for Concurrent Air-to-Ground Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing High Frequency Data Link (HFDL) protocol for airborne high frequency communications faces significant delays due to transmission collisions and retries, as multiple aircraft compete for limited downlink slots on a single frequency, which is not efficient for supporting concurrent communication transactions.
Innovation Solution
Implementing a ground station radio device and aircraft radio device configuration that uses multiple downlink frequencies different from the uplink frequency, allowing concurrent data reception and transmission, with the ground station broadcasting housekeeping data to inform aircraft of available frequencies, thereby reducing latency and avoiding collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single frequency is used for multiple aircraft to communicate with a ground station using TDMA protocol, then the system structure is simple and easy to implement, but transmission collisions occur frequently resulting in delays of minutes
Solution Approach 1:
The patent transitions from a single-frequency system to a multi-frequency system, adding the frequency dimension to the communication channel. Multiple aircraft are assigned to different frequencies, allowing simultaneous transmissions without collision, thereby resolving the time delay issue while maintaining manageable system complexity through structured frequency assignment.
Solution Approach 2:
The patent segments the single communication frequency into multiple frequency channels, with each aircraft assigned to a specific frequency slot. This segmentation allows parallel communications on different frequencies while the ground station coordinates assignments to maintain system organization and avoid interference.
2Device complexity
If multiple aircraft concurrently vie for limited downlink slots on a single frequency, then the system maintains simplicity, but transmission collisions result in frequent failures and retries
Solution Approach 1:
By introducing multiple frequency dimensions, the system provides multiple parallel communication paths. Aircraft that would previously collide on a single frequency can now transmit simultaneously on different frequencies, dramatically improving transmission success rate while the ground station manages frequency assignments to maintain simplicity.
3Device complexity
If the ground station uses the same single frequency for both uplink and downlink communications, then the radio device structure is simplified, but concurrent data reception and transmission cannot occur
Solution Approach 1:
The patent segments the communication spectrum by assigning different frequencies to uplink and downlink directions. The ground station receives downlink data from multiple aircraft on different frequencies simultaneously while maintaining a separate uplink frequency, enabling concurrent operations without requiring complex full-duplex capabilities on a single frequency.
Data Source
AI summary
Various embodiments are directed to systems, methods, and devices for concurrent high frequency down link air to ground communication transactions using multiple frequencies. A ground station radio device includes a transmitter to transmit uplink data to a plurality of aircraft over a first frequency, and a receiver to receive downlink data from the plurality of aircraft over a plurality of second frequencies that are different from the first frequency.