Radar Detection in Nuclear-Scintillated Environments
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Solution Overview
Problem
Radar systems face significant challenges in detecting and tracking objects in nuclear-scintillated environments due to severe signal refraction and attenuation caused by highly ionized plasma, leading to reduced efficacy of anti-ballistic missile systems during nuclear fireball blackouts.
Innovation Solution
The method involves transmitting a plurality of narrowband signals corresponding to consecutive segments of a linear frequency modulated (LFM) waveform, processing echo signals to generate waveform segments, combining them to produce a composite waveform, and applying a matched filter to identify airborne or spaceborne objects, using a system with a transmitter, receiver, and processors to mitigate distortion effects within the nuclear-scintillated environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar systems transmit wideband signals to achieve fine range resolution, then measurement precision improves, but signal distortion and attenuation increase in nuclear-scintillated environments
Solution Approach 1:
The patent divides a wideband LFM waveform into multiple consecutive narrowband segments. Each narrowband signal experiences less distortion and attenuation in the plasma environment compared to a full wideband signal. The radar transmits these segmented narrowband signals sequentially and processes their echoes to achieve composite range resolution that approaches wideband performance while maintaining better signal integrity in nuclear-scintillated conditions.
2Measurement precision
If radar systems use traditional wideband LFM waveforms, then range resolution is improved, but detection reliability deteriorates due to severe refraction and attenuation
Solution Approach 1:
The patent segments the wideband LFM waveform into multiple narrowband components that can be transmitted through the plasma environment with reduced refraction and attenuation. By processing and combining the echoes from these segmented signals, the system achieves reliable detection while maintaining acceptable range resolution.
Solution Approach 2:
The patent applies preliminary signal processing techniques including matched filtering and coherent integration of the segmented narrowband echo signals. This preliminary processing enhances the signal-to-noise ratio and compensates for the reduced signal strength caused by plasma attenuation before final target detection and ranging.
3Reliability
If radar systems transmit narrowband signals to reduce distortion, then reliability improves, but measurement precision deteriorates due to coarser range resolution
Solution Approach 1:
The patent transmits multiple narrowband signals that are segments of a broader frequency spectrum. While each individual narrowband segment provides good signal integrity, the collection of segments spans a wider bandwidth, enabling the system to achieve fine range resolution through coherent processing of all segments.
Solution Approach 2:
The patent combines the echo signals from multiple narrowband segments through coherent integration and matched filtering. This merging process reconstructs the effective wideband response, achieving fine range resolution while each individual narrowband transmission maintained good signal integrity through the plasma environment.
4Productivity
If radar systems use wideband waveforms to achieve fine range resolution, then productivity improves, but loss of energy increases due to severe attenuation
Solution Approach 1:
The patent segments the wideband waveform into narrowband components that suffer less attenuation in the plasma environment. This allows the radar to transmit signals that retain more energy throughout the propagation path while still achieving the detection efficiency needed for tracking ballistic missiles and other high-speed targets.
Solution Approach 2:
The patent applies preliminary coherent integration and matched filtering to the received narrowband echo signals. This preliminary energy accumulation process compensates for the reduced signal strength from narrowband transmissions, maintaining detection efficiency without requiring excessive transmitted power.
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 approach enables radar systems to maintain detection and tracking capabilities during nuclear fireball blackouts by reducing distortion and extending the operating range, while providing granular range resolution necessary for accurate identification of objects like ballistic missiles.
Implementation Method 1
transmitting a plurality of narrowband signals corresponding to a plurality of consecutive segments of a linear frequency modulated (LFM) waveform
Implementation Method 2
the plasma in the nuclear fireball causes radar signals to be so heavily refracted that radar systems cannot track and identify objects
Implementation Method 3
receiving a plurality of echo signals corresponding to the plurality of narrowband signals being reflected from an airborne or spaceborne object
Implementation Method 4
applying a matched filter to the composite waveform using the LFM waveform to identify the airborne or spaceborne object
Data Source
AI summary
The present disclosure relates to enabling a radar system relates to identify airborne and spaceborne objects in a nuclear-scintillated environment. In some embodiments, the radar system transmits a plurality of narrowband signals corresponding to a plurality of consecutive segments of a linear frequency modulated (LFM) waveform. The radar system receives a plurality of echo signals corresponding to the plurality of narrowband signals being reflected from an airborne or spaceborne object. Upon processing the plurality of echo signals to generate a plurality of waveform segments, the radar system combines the plurality of waveform segments to produce a composite waveform. Then, the radar system applies a matched filter to the composite waveform using the LFM waveform to identify the airborne or spaceborne object.