High-Speed Platform Telemetry Doppler Compensation
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Solution Overview
Problem
High-speed platforms experience Doppler and Doppler rate issues in telemetry streams, leading to receiver lock loss and data dropout due to rapid frequency changes, which existing systems struggle to compensate for without complex designs and prior coordination.
Innovation Solution
A high-speed platform telemetry system with a platform transmitter, real-time Doppler map database, position location device, processor, and frequency offset circuit that determines and applies Doppler correction factors to maintain a stable frequency, ensuring continuous data transmission despite changing Doppler rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the HSP transmits telemetry data at high velocity, then data transmission capability is improved, but Doppler rate changes cause receiver lock loss and telemetry dropout
Solution Approach 1:
The system pre-calculates and stores Doppler correction factors in a lookup table before transmission begins. The processor retrieves the appropriate correction factor based on pre-determined geometric relationships between HSP, relay satellite, and ground station, allowing immediate application without real-time calculation delays
Solution Approach 2:
The patent introduces an intermediary frequency offset circuit that sits between the telemetry data source and the transmission channel. This circuit applies Doppler correction by offsetting the carrier frequency based on pre-calculated factors, effectively mediating the Doppler effect before the signal reaches the vulnerable tracking loop
2Reliability
If complex Doppler compensation systems are implemented, then receiver lock stability is improved, but system complexity and coordination requirements increase
Solution Approach 1:
All complex calculations are performed beforehand and stored in lookup tables. The runtime system only needs to retrieve pre-computed Doppler correction factors based on simple geometric parameters, eliminating the need for complex real-time computation hardware
Solution Approach 2:
The system uses readily available navigation information and position data from existing HSP navigation systems to self-determine the required Doppler correction, eliminating the need for external coordination or additional sensing infrastructure
3Adaptability or versatility
If tracking loop bandwidth is increased to handle Doppler rate changes, then Doppler rate tolerance is improved, but receiver sensitivity and telemetry data quality deteriorate
Solution Approach 1:
The patent converts the harmful Doppler effect into a beneficial predictable frequency offset. By pre-calculating the exact frequency shift based on geometric relationships, the system transforms an unpredictable disturbance into a controlled parameter that can be easily compensated
Solution Approach 2:
The system changes the frequency parameter of the transmitted signal by applying a pre-calculated offset. This parameter change compensates for the Doppler effect before it can degrade the tracking loop performance or telemetry data quality
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 system effectively compensates for high Doppler effects, maintaining receiver lock and ensuring data integrity by dynamically adjusting the transmission frequency, thereby preventing telemetry dropouts and allowing for real-time data analysis without prior planning or complex coordination.
Implementation Method 1
compensating for high Doppler in a telemetry stream transmitted by a platform transmitter on the high-speed platform to a first station along a signal path as the high-speed platform moves along a travel path that passed near the first station
Data Source
AI summary
A high-speed platform telemetry system (“HSPTS”) within a high-speed platform (“HSP”), for compensating for high Doppler in a telemetry stream is disclosed. The HSP is in signal communication with a first station, the telemetry stream is transmitted between the HSP and the first station, and the high Doppler is created by the HSP as the HSP moves along a travel path that passed near the first station. The HSPTS may include a platform transmitter, an on-board storage device having a real-time Doppler map database and navigation information corresponding to the travel path of the HSP, a position location device, a processor in signal communication with the position location device and on-board storage device, and a frequency offset circuit in signal communication with the platform transmitter and processor.