Auxiliary GPS Signal Simulation for Jamming Resilience
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Solution Overview
Problem
Existing GPS technologies face challenges in providing accurate positional, navigational, and timing information in adverse environmental conditions such as dense foliage or urban canyons, and under radio frequency jamming or spoofing, due to signal attenuation and interference, which existing solutions like specialized receivers or additional devices are costly and inefficient.
Innovation Solution
A method using at least four transceiver devices to receive GPS signals, calculate their position and velocity, and repack the data into a spread signal structure, which is then transmitted to an auxiliary GPS device to generate a simulated GPS signal that can be used by existing receivers to compute position, compatible with existing GPS systems and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specialized signal processing is used to increase processing gain, then GPS signal acquisition and tracking is improved in adverse environments, but device complexity and cost increase due to bespoke receiver design
Solution Approach 1:
The patent introduces an intermediary system consisting of transceiver devices and an auxiliary GPS device that processes signals externally. The transceivers receive GPS signals, calculate positions and velocity vectors, then transmit processed data to the auxiliary device which generates simulated GPS signals. This mediator approach allows existing receivers to benefit from enhanced processing without modifying their internal complexity.
Solution Approach 2:
The auxiliary GPS device creates a copy or simulation of GPS signals based on processed transceiver data. By generating simulated GPS signals that replicate the characteristics of authentic GPS signals, the system enables existing receivers to obtain accurate PNT information without requiring specialized hardware modifications.
2Reliability
If GPS satellite power output is increased, then signal strength in adverse environments is improved, but it is not feasible due to fixed satellite orbits and design constraints
Solution Approach 1:
Instead of increasing satellite power output, the patent inverts the approach by having ground-based transceivers receive satellite signals and then retransmit processed versions. The auxiliary GPS device generates simulated signals that compensate for signal attenuation, effectively achieving the goal of stronger signals without modifying the satellites themselves.
3Reliability
If rebroadcasting GPS signal is implemented, then position information is provided in adverse environments, but interference with actual GPS signals and regulatory burdens occur
Solution Approach 1:
The patent uses an intermediary processing chain where transceivers receive authentic GPS signals, extract position and velocity data, then transmit this processed information to the auxiliary device. The auxiliary device generates simulated GPS signals that are distinct from direct rebroadcasts, reducing interference while maintaining position information availability.
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 solution provides accurate PNT information in adverse environments without the need for costly bespoke receivers or additional devices, is self-calibrating, and mitigates interference and jamming threats, while being backwards compatible with existing GPS technology.
Implementation Method 1
Each transceiver device 201 receives a plurality of GPS signals from a plurality of GPS satellites 500, calculates a transceiver position and transceiver velocity vector, and transmits the GPS signal, transceiver position, and transceiver velocity vector as a first GPS-like signal at a frequency different from the GPS band
Data Source
AI summary
A method of providing accurate position, navigation, and timing information comprising the steps of providing at least four transceiver devices, providing an auxiliary GPS device, and providing a receiver GPS device. Each transceiver devices receives a plurality of GPS signals from a plurality of GPS satellites, and calculates a transceiver position and transceiver velocity vector. The transceiver position, transceiver velocity vector, and GPS signal are repackaged at each transceiver into a first spread signal structure, which is transmitted from each transceiver as a first GPS-like signal. The GPS-like signal is received at an auxiliary GPS device, which generates a simulated GPS signal. This simulated GPS signal is then output and received by a simulated GPS device.