Multimode Radar Pulse Sequencing With Random Phases for Range Fidelity
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Solution Overview
Problem
Radar systems struggle to perform multiple tasks simultaneously without degrading performance, particularly in terms of range, due to limitations in antenna architecture and emission techniques like sub-arraying and colored emission.
Innovation Solution
A method for operating a radar system that involves alternating between different modes, such as synthetic aperture radar imaging and Doppler modes, by generating sequences of pulses with random phases, frequencies, and polarizations, allowing for simultaneous task execution within a common time window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sub-arraying and colored emission are used to perform multiple tasks simultaneously, then task execution capability is improved, but range performance deteriorates
Solution Approach 1:
The patent applies periodic action by alternating between different radar operating modes (SAR imaging mode and Doppler surveillance mode) in a time-division multiplexed manner. The radar performs SAR imaging during specific time intervals and Doppler surveillance during other intervals, allowing multiple tasks to be executed without simultaneously degrading range performance. This periodic switching enables the radar to maintain optimal performance for each mode during its active period.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting radar operating parameters (frequency, pulse repetition rate, waveform) depending on the current operating mode. During SAR imaging, parameters are optimized for high-resolution imaging, while during Doppler surveillance, parameters are adjusted for velocity detection. This parameter adaptation allows the radar to maintain optimal performance for each specific task without the continuous performance degradation associated with sub-arraying.
2Adaptability or versatility
If time budget is allocated to multiple tasks, then task diversity is improved, but detection effectiveness for individual tasks deteriorates
Solution Approach 1:
The patent implements periodic action through time-division multiplexing, where the radar alternates between SAR imaging tasks and Doppler surveillance tasks in regular intervals. Each task receives dedicated time slots with optimized parameters, ensuring that detection effectiveness for individual tasks is maintained while still achieving task diversity. The periodic structure allows the radar to fully dedicate resources to each task during its active period.
3Measurement precision
If single-task mode is used, then system performance is maintained, but adaptability to multiple missions deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing periodic switching between different operating modes (SAR imaging and Doppler surveillance). The radar maintains optimal system performance for each specific mode during its active period while achieving adaptability to multiple missions through time-division multiplexing. This approach allows the radar to be reconfigured for different missions without continuously compromising performance.
Solution Approach 2:
The patent applies dynamics by making the radar operating mode changeable and adaptive over time. The system dynamically switches between SAR imaging mode and Doppler surveillance mode based on mission requirements, allowing the radar to adapt to different missions while maintaining optimal performance characteristics for each mode during its active period.
Data Source
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AI summary
The present invention relates to a method for operating a target detection radar according to a first operating mode and at least one second operating mode, the first operating mode being a synthetic aperture radar imaging mode and each second operating mode being different from the first operating mode, the method comprising the implementation of several recurrences of a signal transmission/reception step, each recurrence of said step comprising the following sub-steps: - generation of a sequence of consecutive pulses, each pulse of the sequence being associated with a respective operating mode, - transmission of the pulses in different frequency bands, and - reception in a common time window of the echoes of the pulses, during the transmission sub-step of each recurrence, at least one of the pulses, called the phase-shifted pulse,being emitted with a random phase associated with the number N.,