LPIA Spread Spectrum Landing System for Jamming Resilience
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Solution Overview
Problem
Conventional landing systems for mobile platforms, such as aircraft, face challenges when primary systems are jammed or disabled, especially in hostile environments like moving ships, where GPS signals can be interfered with, leading to a need for a reliable secondary landing system.
Innovation Solution
A spread spectrum landing system utilizing a Low Probability of Intercept Altimeter (LPIA) that can be retrofitted to function as a secondary landing system, independent of shipboard systems and minimally reliant on GPS, with a plurality of asymmetrically placed transceiver antennas and software modifications to enable robust Newton-Raphson process-based positioning for approach and landing phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primary GPS-based landing system is used, then landing precision can be achieved under normal conditions, but the system becomes vulnerable to jamming and denial in hostile environments
Solution Approach 1:
The patent converts the limitation of LPIA devices (originally designed only for altitude measurement) into a benefit by repurposing them for precision landing operations. The LPIA's inherent low probability of intercept特性 is leveraged to create a landing system that is both precise and resistant to jamming, turning a device's original restrictive function into an advantage for hostile environment operations
Solution Approach 2:
The patent makes the LPIA device multi-functional by enabling it to perform both its original altitude measurement function and a new precision landing guidance function. Through software modifications and integration with transceiver antennas, the single LPIA device serves multiple purposes: altitude measurement, position determination, and landing guidance, eliminating the need for separate dedicated landing systems
2Adaptability or versatility
If a secondary landing system is implemented using retrofitted LPIA devices, then independence from shipboard systems is achieved, but integration complexity increases
Solution Approach 1:
The patent segments the landing system into independent modular components: the LPIA device on the aircraft, multiple transceiver antennas on the ship, and software processing units. This segmentation allows the system to operate independently from existing shipboard systems while maintaining clear functional boundaries. Each component can be installed and configured separately, reducing overall integration complexity despite the system's independence
Solution Approach 2:
The patent introduces software as an intermediary layer that bridges the LPIA hardware and the landing control functions. The software modifications enable the LPIA to interface with the Newton-Raphson positioning algorithm and coordinate system transformations, acting as a mediator that simplifies the integration between the retrofitted device and the landing system requirements without requiring deep integration with shipboard systems
3Object-affected harmful factors
If spread spectrum technology is used in LPIA devices, then anti-jamming capability is improved, but the device's original altimeter function must be modified
Solution Approach 1:
The patent changes the operational parameters of the LPIA device by enabling spread spectrum signal processing capabilities. This involves modifying the device to process pseudorandom codes and perform correlation operations, transforming it from a simple altitude measurement device to one capable of both altitude measurement and precision position determination with inherent anti-jamming properties. The parameter change is achieved through software modifications that alter how the device processes incoming signals
Data Source
AI summary
The present disclosure provides a spread spectrum landing system with a low probability of intercept altimeter that is in communication with a plurality of asymmetrically placed antennas or transponders near a landing area. The low probability of intercept altimeter acts as a secondary system in the event that a primary landing system for the mobile platform is denied or otherwise inoperable. The low probability of intercept altimeter cycles through unique pseudo noise (PN) codes to determine a line of sight relative to each antenna or transponder. A single algorithm or process determines and ranges the platform relative to the transponders to effectuate the landing of the platform.