HFDL Data Radio High Data Rate Frequency Selection
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Solution Overview
Problem
The existing aeronautical High Frequency Data Link (HFDL) system has a limited data rate of 1.8 Kb/sec, and re-engineering infrastructure for higher data rates is costly and time-consuming, making it desirable to enable high data rate capability over current equipment and within assigned frequencies for downlink communications.
Innovation Solution
The method involves an aircraft subsystem and ground station using HFDL data radios to select and transmit high data rate frequencies within the existing frequency band, allowing aircraft to log into and transmit HDR packets, with the ground station recognizing successful login and receiving HDR data packets, and optionally reverting to standard HFDL if propagation is poor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If advanced waveforms are used to provide higher data rates, then data rate is improved, but infrastructure re-engineering cost and time increase
Solution Approach 1:
The patent changes the data transmission parameters by implementing advanced waveforms (QPSK, 8-PSK, 16-QAM modulation schemes) and variable data rates (1.8 Kb/sec to 14.4 Kb/sec) within the existing HFDL frequency band (2-30 MHz), allowing higher data rates without requiring new infrastructure
Solution Approach 2:
The system enables multiple functions within the existing HFDL infrastructure by supporting both traditional HFDL communications and advanced HDR-HFDL waveforms using the same ground stations and frequency assignments, making the infrastructure multi-functional
2Adaptability or versatility
If existing HFDL infrastructure is re-engineered for new emission types and frequencies, then HDR capability is achieved, but implementation time and cost increase
Solution Approach 1:
The patent performs preliminary actions by selecting and testing advanced waveforms and frequency assignments within the existing HFDL band before full implementation, allowing for validation and optimization without disrupting existing operations
Solution Approach 2:
The system dynamically adjusts between different modulation schemes (QPSK, 8-PSK, 16-QAM) and data rates (1.8 Kb/sec to 14.4 Kb/sec) based on channel conditions, allowing flexible adaptation without fixed infrastructure changes
Data Source
AI summary
A method and apparatus for establishing a high data rate high frequency data link (HDR-HFDL) between aircraft and ground stations enhances the aircraft HFDL data radio to transmit at an HDR frequency assigned by a ground station and transmitted to the aircraft via the HFDL frequency assigned to the ground station. The ground station may select and transmit an alternate HDR frequency if necessary. In Phase I, existing aircraft subsystems and ground stations will be configured for HDR downlink only, but an aircraft subsystem may additionally receive HDR data packets if propagation conditions allow. In Phase II, dedicated HDR ground stations and enhancements to existing aircraft subsystems will provide for full HDR uplink and downlink capability. Dedicated HDR ground stations may select an HDR frequency from the band including the assigned HFDL frequency or transmit at an assigned HDR frequency.