Radar Device Pulse Width Segmentation for Racon Detection
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Solution Overview
Problem
Solid-state radar devices face challenges in detecting response signals from racons due to pulse width limitations, leading to incomplete radar images, especially in long-distance areas where the response signal from modulated pulse signals is often not acquired.
Innovation Solution
A radar device that transmits both unmodulated and modulated pulse signals with different widths, comparing signal intensities to generate a radar image, ensuring the response signal from racons is accurately displayed by prioritizing signal intensity in specific sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a modulated pulse signal with a wide pulse width is transmitted to improve S/N ratio for distant targets, then the detection performance for distant locations is improved, but the response signal from racon cannot be acquired because racon does not respond to wide pulse width signals
Solution Approach 1:
The patent divides the detection area into two sections: a first section (near field) where unmodulated pulse signals are used to detect racon response signals, and a second section (far field) where modulated pulse signals are used to detect distant targets. This segmentation allows each pulse type to be optimized for its specific detection zone, resolving the contradiction between detecting racon responses and detecting distant targets.
2Loss of information
If an unmodulated pulse signal with a narrow pulse width is transmitted to detect racon response signals, then the response signal can be acquired, but the S/N ratio for distant targets deteriorates
Solution Approach 1:
The patent applies different signal characteristics to different spatial zones: unmodulated narrow pulse signals are used in the near field (first section) where racon response detection is prioritized, while modulated wide pulse signals are used in the far field (second section) where distant target detection is prioritized. This local differentiation of signal quality resolves the contradiction by allowing each zone to use the most appropriate signal type for its specific detection needs.
3Reliability
If a modulated pulse signal with a wide pulse width is transmitted, then the S/N ratio is improved, but the response signal from racon is elongated and not displayed normally in the radar image
Solution Approach 1:
The patent segments the radar image display into two distinct sections: the first section displays radar images based on unmodulated pulse signals where racon response signals are clearly visible, and the second section displays radar images based on modulated pulse signals where distant targets are clearly visible. This segmentation prevents the elongation and display distortion of response signals that would occur if modulated signals were used throughout the entire display area.
4Reliability
If transmission power is increased to improve detection of distant targets, then the detection range is extended, but the device size and complexity increase
Solution Approach 1:
The patent changes the temporal parameter (pulse width) and modulation state of the transmitted signals rather than simply increasing transmission power. By transmitting unmodulated narrow pulse signals for near-field racon detection and modulated wide pulse signals for far-field target detection, the system extends detection range and maintains signal quality without requiring proportionally higher transmission power, thereby avoiding excessive device size and complexity increases.
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
This approach enhances the detection and display of racon response signals in both short and long-distance areas, improving the S/N ratio and reducing blind zones, thereby providing more accurate radar images.
Implementation Method 1
a transmitter 2 configured to transmit a first pulse signal and a second pulse signal
Implementation Method 2
a receiver 3 configured to receive a first reception signal including a reflection signal of the first pulse signal and a second reception signal including a reflection signal of the second pulse signal
Data Source
AI summary
A radar device includes a transmitter, a receiver and processing circuitry. The transmitter transmits a first pulse signal and a second pulse signal, a pulse width of the second pulse signal being wider than a pulse width of the first pulse signal. The receiver may receive a first reception signal including a reflection signal of the first pulse signal and a second reception signal including a reflection signal of the second pulse signal. The processing circuitry may be configured to compare, in a first section that is at least partly in a distance direction, a signal intensity of the first reception signal with a signal intensity of the second reception signal, and generate a display signal based on a result of the comparison.