Electronic Warfare Scan Interleaving for Multi-Band Emitter Detection
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Solution Overview
Problem
Modern electronic warfare systems face challenges with receivers/emitters having finite bandwidth, polarization, and dynamic range, making it difficult to detect and adapt to agile, low probability of intercept (LPI) emitters that operate across multiple frequencies and channels.
Innovation Solution
An EW system with multiple receivers having different bandwidths and a processor that executes adaptive scan schedules, including managed extensions for direction finding, geolocation, and pulse repetition interval measurements, and a blanking technique to optimize resource allocation and minimize interference, allowing real-time adjustments to detect and track LPI emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single receiver operates at a fixed bandwidth, then the receiver structure is simple and easy to operate, but it cannot detect emitters operating at multiple frequencies and channels
Solution Approach 1:
The system divides the electromagnetic spectrum into multiple frequency bands and assigns different receivers to monitor specific bands. Each receiver is tuned to a particular bandwidth, and the system segments the detection task across multiple specialized receivers rather than using one general-purpose receiver, thereby achieving broad frequency coverage while keeping individual receiver designs simple
Solution Approach 2:
The system creates a universal detection capability by combining multiple receivers with different bandwidths. The processor coordinates these receivers to perform multiple functions: detecting emitters across different frequencies, determining geolocation, measuring pulse repetition intervals, and identifying emitter types, all through a unified multi-receiver architecture
2Measurement precision
If the system performs comprehensive measurements including direction finding, geolocation, and pulse repetition interval measurements, then the identification accuracy of emitters is improved, but the time required for detection and the complexity of the system increases
Solution Approach 1:
The system performs preliminary detection by having multiple receivers continuously monitor different frequency bands and capture emitter signals. This preliminary action ensures that when an emitter of interest is detected, the signal data is already available for immediate comprehensive analysis, eliminating the need for sequential scanning and reducing overall detection time
Solution Approach 2:
The system merges multiple measurement functions (direction finding, geolocation, pulse repetition interval measurement) into a simultaneous processing architecture. The processor analyzes signals from multiple receivers at the same time, combining measurement operations that would traditionally be performed sequentially, thereby achieving high identification accuracy without proportionally increasing detection time
3Reliability
If multiple receivers with different bandwidths are used to detect LPI emitters, then the detection capability against agile emitters is improved, but the resource allocation complexity and interference management become more difficult
Solution Approach 1:
The system implements feedback mechanisms where the processor continuously monitors signals received by all receivers and dynamically adjusts resource allocation. When an LPI emitter is detected in one bandwidth, the system feedback-controls the distribution of processing resources to focus analysis on that frequency band while maintaining surveillance on others, optimizing detection reliability without requiring complex manual resource management
Solution Approach 2:
The processor acts as an intermediary that coordinates between multiple receivers with different bandwidths. It manages potential interference by selecting appropriate receiver combinations for analysis, filtering conflicting signals, and synthesizing data from multiple sources into coherent emitter identification results, thereby simplifying the complexity of managing multiple diverse receivers
Data Source
AI summary
An electronic warfare (EW) system that is to be installed on a platform has a plurality receivers that are part of the EW system. A first receiver may be an electronic countermeasure (ECM) to discriminate characteristics of an incoming first signal from a first emitter. The first receiver operates at a first bandwidth on a first scan schedule. A second receiver may be a radar warning (RW) component to discriminate characteristics of an incoming second signal from a second emitter. The second receiver operates at a second bandwidth on a second scan schedule. The EW system has a processor that executes instructions to interleave the first scan schedule and second scan schedule. Interleaving the first scan schedule and the second scan schedule may provide the EW system as an integrated EW system with predictable performance that is optimized for environmental load and receiver allocation.