Multimode Radar Pulse Scheduling With Random-Phase SAR Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Radar systems struggle to perform multiple tasks simultaneously without degrading performance, particularly in terms of range, due to limitations in antenna architectures and emission techniques like colored emission in MIMO systems.
Innovation Solution
A method for operating a radar system that includes alternating between synthetic aperture radar imaging and another mode, such as Doppler mode, by emitting pulses with random phases and frequencies, and receiving echoes in a common time window to distinguish and process multiple tasks efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar systems use traditional single-task operation mode, then system performance and detection precision are maintained, but the radar cannot perform multiple tasks simultaneously
Solution Approach 1:
The patent segments the radar operation into distinct temporal phases within a recurrence cycle. Each phase is dedicated to a specific task (e.g., SAR imaging, Doppler mode), allowing the radar to perform multiple tasks sequentially while maintaining the precision required for each individual task. The segmentation is achieved by dividing the operational time into Nth recurrences, where each recurrence contains multiple pulses assigned to different tasks.
Solution Approach 2:
The patent implements periodic action by organizing radar operations into recurring cycles. Each recurrence follows a predetermined pattern of pulse emission and task execution, allowing the radar to systematically alternate between different operational modes. This periodic structure ensures that each task receives adequate attention while maintaining overall system performance across multiple recurrences.
2Measurement precision
If radar systems allocate more time to a single task, then detection and discrimination capacity improve, but the refresh time and ability to perform other tasks deteriorate
Solution Approach 1:
The patent applies dynamics by making the radar's operational configuration adaptive rather than fixed. The system dynamically adjusts the allocation of pulses to different tasks based on operational requirements, allowing optimization of detection capacity for each task while maintaining acceptable refresh rates. The dynamic nature is reflected in the flexible assignment of pulses within recurrences and the ability to switch between different operational modes.
3Adaptability or versatility
If radar systems use colored emission in MIMO architecture to perform simultaneous tasks, then multitasking capability improves, but range performance and detection precision deteriorate
Solution Approach 1:
The patent segments the simultaneous task execution into sequential phases within each recurrence, avoiding the need for colored emission in MIMO architecture. By dividing the operational time into distinct pulses and recurrences, each dedicated to specific tasks, the system achieves multitasking capability without compromising range performance or detection precision that would result from simultaneous colored emission.
Data Source
AI summary
A method of operating a target detection radar following a first mode of operation and at least one second mode of operation, the first mode of operation being a synthetic aperture radar imaging mode and each second mode of operation being different from the first mode of operation, the method including the implementation of several recurrences of a signal emission/reception operation, wherein, for each N, the Nth recurrence of the operation including the following sub-operations: generation of a sequence of consecutive pulses, each pulse of the sequence being associated with a respective mode of operation, emission of the pulses in different frequency bands, and reception of the pulse echoes in a common time window, during the sub-operation of emission, at least one of the pulses, called the out of phase pulse, being emitted with a random phase associated with the number N.