IR Sensor Jamming System with Multi-Wavelength Laser Diodes
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Solution Overview
Problem
Current antimissile protection systems for civil aircraft are too large, heavy, and expensive, with high aerodynamic drag, and fail to meet the constraints of size, weight, and cost, while also lacking sufficient scrambling codes and ensuring eye safety, especially when integrated on helicopters or other civil aircraft.
Innovation Solution
An IR sensor jamming system with a reduced size optronic module, utilizing multiple laser diodes capable of emitting at different wavelengths in quasi-continuous mode, combined with an IR detector and damage equipment, featuring a harmonization device for both channels and a common entrance pupil, allowing for increased scrambling codes and improved eye safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a military-grade antimissile protection system is used, then missile detection and jamming capability is improved, but system size, weight, and aerodynamic drag increase excessively for civil aircraft
Solution Approach 1:
The system is divided into separate functional modules: a detection module with UV and IR detectors, a processing module for signal analysis, and a jamming module with laser diodes. This segmentation allows each module to be optimized independently, reducing overall system weight while maintaining military-grade capability.
Solution Approach 2:
The system integrates multiple functions into a single compact unit: UV detection for missile launch, IR detection for tracking, signal processing for code generation, and laser jamming for countermeasures. This multi-functionality eliminates the need for separate systems, significantly reducing weight and aerodynamic drag for civil aircraft.
2Reliability
If traditional laser jamming systems are used, then missile seeker neutralization is improved, but the number of scrambling codes is limited due to short pulse duration
Solution Approach 1:
The laser diodes operate in quasi-continuous mode with pulse durations extended to several microseconds instead of nanoseconds. This continuous action allows multiple scrambling codes to be transmitted within each pulse, dramatically increasing the number of available codes from limited quantities to over 100 distinct codes, thereby improving adaptability against different missile types.
3Reliability
If high-power damaging laser is used, then missile damage capability is improved, but eye safety is compromised
Solution Approach 1:
The damaging laser is configured to deliver high power only at the focal point on the missile seeker, while maintaining low power density along the beam path. This localized energy concentration achieves effective missile damage capability at long ranges while keeping the beam safe for passing aircraft and personnel, resolving the eye safety contradiction.
4Adaptability or versatility
If a system with separate jamming and damage channels is implemented, then functional versatility is improved, but system dimensions become excessively large for airborne installation
Solution Approach 1:
The detection module, processing module, and both jamming and damaging laser channels are merged into a single integrated optronic module. Shared components include the UV and IR detectors, the signal processing unit, and the laser diode array that can operate in multiple modes. This consolidation achieves functional versatility while reducing system volume to fit within civil aircraft constraints.
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 achieves a higher number of scrambling codes and ensures eye safety without increasing system size, enabling effective jamming and damage capabilities within the constraints of civil aircraft, with a detection rate of approximately 20 kHz and reduced noise, thus meeting the requirements of size, weight, and cost.
Implementation Method 1
an IR emission device for jamming, comprising several laser diodes (111), each laser diode being capable of emitting at a different wavelength λ
Implementation Method 2
a pulse detector comprising a matrix of IR photodetectors, each photodetector comprising a transducer and an integrator
Data Source
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AI summary
The invention relates to an IR-sensor jamming device that includes: an IR transmission device for jamming; a pulse detector (100) that comprises an IR photodetector matrix, each photodetector including a transducer (1) and an integrator (2). The IR transmission device for jamming includes a plurality of laser diodes (111), each laser diode being capable of: i) transmission at a different wavelength ?; ii) operation in quasi continuous mode, i.e. with a shape factor > 0.3. Each photodetector includes a means for opening the integrator during the reception of each pulse and for closing the integrator between two receptions, for summing the charges integrated by the integrator over a plurality of pulses, and for reading the sum of the charges integrated on a plurality of pulses.