Passive Radar Deception Target Generation Using Multi-Source Jamming
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Solution Overview
Problem
Existing passive radar jamming techniques are difficult to implement effectively due to the covert nature of passive radars, making it challenging to generate accurate deception targets without being detected, and operators can easily recognize jamming on the radar screen.
Innovation Solution
A method and apparatus for generating deception target information that sets jamming channels based on a jammer's movement path, groups channels according to operating environment and purpose, analyzes a deception target settable area, and derives deception target information using passive radar reference positions and actual target paths, allowing for the creation of synchronized false targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional passive radar jamming techniques are used, then jamming signals can be transmitted, but the covert nature of passive radars makes it difficult to generate accurate deception targets and operators can easily recognize jamming on the radar screen
Solution Approach 1:
The patent segments the jamming system into multiple independent components: a passive radar reference signal receiver that captures third transmission source signals, a deception target information generator that processes reference signals, and a jamming signal transmitter. This segmentation allows each component to be optimized independently, improving deception effectiveness while managing system complexity.
Solution Approach 2:
The patent implements preliminary action by pre-selecting third transmission sources (FM radio, DMB, digital TV) as reference signals before jamming operations. The system pre-processes these reference signals to extract characteristics, pre-calculates deception target information including TDOA and FDOA, and prepares deception target data in advance. This preliminary processing ensures accurate deception targets can be generated rapidly when jamming is required, improving reliability without proportionally increasing complexity.
2Measurement precision
If deception target information is generated using multiple third transmission sources, then accurate deception targets can be created, but the system requires complex processing of reference signals and target reflection signals
Solution Approach 1:
The patent applies universality by designing a multi-functional passive radar reference signal receiver that can simultaneously receive and process signals from multiple third transmission sources (FM radio broadcasting, terrestrial digital multimedia broadcasting, digital TV broadcasting). This single receiver performs multiple functions: capturing reference signals, estimating TDOA, calculating FDOA, and generating deception target information for multiple jamming channels, thereby reducing overall system complexity while maintaining high measurement precision.
Solution Approach 2:
The patent uses copying by creating virtual deception targets that replicate the characteristics of actual targets. The system copies the TDOA and FDOA characteristics of real targets by processing reference signals and target reflection signals, then generates deceptive target information that mimics authentic target signatures. This copying approach enables accurate deception targets to be created without requiring direct access to actual target data, reducing processing complexity while maintaining measurement precision.
3Area of stationary object
If the system processes signals from multiple third transmission sources simultaneously, then comprehensive coverage is achieved, but the processing time and computational load increase
Solution Approach 1:
The patent implements periodic action by having the passive radar reference signal receiver continuously and periodically scan multiple third transmission source frequencies and channels. The system periodically updates reference signal characteristics, TDOA estimates, and FDOA calculations for each transmission source. This periodic processing approach ensures comprehensive coverage of the radar operating area while managing computational load through time-multiplexed processing, preventing overwhelming processing time requirements.
Solution Approach 2:
The patent applies preliminary action by pre-processing and storing characteristics of third transmission sources including frequency ranges, modulation types, and signal patterns. The system pre-calculates expected TDOA and FDOA values for different target positions and transmission source combinations. When jamming is required, this pre-prepared information enables rapid generation of deception target data without performing complete real-time analysis of all transmission sources, thereby achieving comprehensive coverage while minimizing processing time loss.
Data Source
AI summary
A method for generating deception target information is proposed. The method may include setting third transmission sources pre-selected based on movement path of a jammer as jamming channels, setting a passive radar reference position according to presence or reliability of prior information on position of the passive radar. The method may also include grouping set jamming channels into groups according to operating environment and purpose and analyzing a deception target settable area based on positions of the third transmission sources, the passive radar reference position, and a movement path of the actual target. The method may further include setting a deception target movement path and deriving the deception target information based on the passive radar reference position, the positions of the third transmission sources, the movement path, and a movement path of a virtual deception target for each deception target movement path.