Bistatic Ladar Cross-Receiver Segmentation for Interference Mitigation
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Solution Overview
Problem
Bistatic ladar systems face challenges in reducing latency and interference, particularly due to their non-coaxial configuration, which affects their ability to detect dynamic obstacles effectively, especially at high speeds, leading to increased sensitivity to background noise and interference.
Innovation Solution
The implementation of adaptive pulse duration, polarization diversity, and cross-receivers in bistatic ladar systems to mitigate background noise and interference, allowing for improved detection capabilities and reduced latency, while maintaining a small transmit aperture for agility and low light detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bistatic ladar system uses a large receive aperture to improve low light detection, then sensitivity to interference increases
Solution Approach 1:
The receive aperture is divided into multiple independently controllable segments or zones. By selectively activating only the necessary segments for detecting returns from specific directions, the system maintains sensitivity while reducing the total aperture area that collects interference, thus resolving the contradiction between detection sensitivity and interference sensitivity.
Solution Approach 2:
Different regions of the receive aperture are assigned different functions or sensitivities. The aperture is optimized locally for specific detection tasks while other regions are configured to minimize interference collection, allowing the system to achieve high sensitivity in required directions without proportionally increasing overall interference sensitivity.
2Measurement precision
If a bistatic ladar system increases collection time to improve detection, then sensitivity to interference increases
Solution Approach 1:
The ladar system uses periodic pulsed illumination rather than continuous illumination. By transmitting short laser pulses and measuring returns during specific time windows, the system achieves high detection sensitivity through temporal gating while minimizing the total collection time and thus reducing exposure to background interference.
Solution Approach 2:
The system performs preliminary measurements of background interference levels before actual detection. Based on these preliminary assessments, the collection time and integration duration are dynamically adjusted to achieve the minimum necessary exposure time for adequate sensitivity, thereby preventing excessive interference accumulation.
3Loss of time
If a ladar system scans rapidly to reduce latency for dynamic obstacle detection, then detection accuracy decreases
Solution Approach 1:
The ladar system dynamically adjusts its scanning pattern based on detected object characteristics and motion patterns. For stationary or slow-moving objects, the system increases dwell time to improve accuracy. For fast-moving objects or in critical situations, the system reduces latency by implementing faster scanning sequences, thus optimizing the trade-off between accuracy and response time according to real-time conditions.
Solution Approach 2:
The system continuously monitors detection results and system performance, using this feedback to optimize scanning parameters. When detection accuracy is insufficient, the system increases dwell time or performs additional scans. When latency becomes critical, the system adjusts scanning speed accordingly, creating a closed-loop control that balances accuracy and response time based on actual operational needs.
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
These techniques enhance the performance of bistatic ladar systems by reducing interference and background noise, enabling them to approach the sensitivity of coaxial systems while maintaining agility and low light detection capabilities, thus improving safety and detection accuracy for vehicles.
Implementation Method 1
the term 'ladar' refers to and encompasses any of laser radar, laser detection and ranging
Implementation Method 2
light detection and ranging ('lidar')
Data Source
AI summary
A ladar system and related method are disclosed where the system includes a ladar transmitter and a ladar receiver. The ladar transmitter transmits ladar pulses into a field of view, and the ladar receiver receives ladar pulse returns from objects in the field of view. The ladar receiver comprises a cross-receiver, the cross-receiver comprising a first 1D array of photodetector cells and a second 1D array of photodetector cells that are oriented differently relative to each other.