Radar Device Phase Velocity Risk Detection
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Solution Overview
Problem
Existing radar devices face challenges in accurately and timely identifying target objects with high collision risk levels, particularly due to limitations in signal processing load, interference from sea surface reflections, and reliance on AIS and ARPA systems which can be incomplete or delayed.
Innovation Solution
A radar device equipped with an antenna for transmitting and receiving electromagnetic waves, a speed calculation module to determine relative velocity based on echo signal phase changes, and a risk level detection module that uses this information along with ARPA and AIS data to emphasize high-risk targets in the display, distinguishing between stationary, moving, and sea surface reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ARPA is used to detect moving vectors of target objects from past radar images, then the moving speed and direction information can be obtained, but the signal processing load becomes large and the number of target objects that can be tracked is limited
Solution Approach 1:
The patent extracts only the necessary phase information from radar echoes to calculate relative velocity, rather than performing full ARPA processing on all detected target objects. This selective extraction of critical data reduces the overall signal processing load while maintaining velocity measurement capability.
Solution Approach 2:
The patent performs preliminary velocity estimation using phase difference calculations on recently received echoes before committing to full ARPA tracking. This preliminary action allows the system to quickly assess which targets warrant detailed tracking, reducing the number of objects that undergo complex ARPA processing.
2Measurement precision
If ARPA tracks target objects using past radar images, then moving information can be detected, but it takes time to detect changes in moving speed and direction
Solution Approach 1:
The patent calculates relative velocity using phase differences from the most recent two echoes, providing immediate velocity information without waiting for multiple scans. This preliminary velocity estimation occurs continuously, enabling rapid detection of speed and direction changes as soon as they occur.
Solution Approach 2:
The patent preemptively calculates velocity from phase differences before full ARPA tracking would detect changes, allowing the system to anticipate and respond to target motion changes more quickly than traditional methods.
3Measurement precision
If irregular echoes such as sea surface reflections appear near the target object, then the captured image becomes blended, but the target object can be lost
Solution Approach 1:
The patent applies different processing strategies to different types of echoes based on their characteristics. By analyzing echo properties such as phase stability and intensity patterns, the system identifies and separately processes sea surface reflections versus genuine target echoes, preventing contamination of target detection.
Solution Approach 2:
The patent performs preliminary classification of echoes using phase difference analysis before full target tracking. This preliminary action identifies sea surface reflections that exhibit characteristic phase behavior, allowing the system to filter them out before they can interfere with target object detection and tracking.
4Loss of information
If AIS is used to receive positional information from other ships, then ship information can be obtained, but the information cannot be acquired quickly due to limited communication repetition
Solution Approach 1:
The patent merges radar-based velocity measurement with AIS positional information to create a comprehensive target assessment system. By combining these two independent information sources, the system achieves complete ship information (position from AIS, velocity from radar phase analysis) without being limited by AIS communication repetition rates.
Solution Approach 2:
The patent performs preliminary velocity assessment using radar phase differences before relying on AIS updates. This preliminary action ensures that velocity information is already available when AIS data arrives, eliminating waiting time and enabling immediate collision risk assessment.
5Measurement precision
If an operator watches the radar screen for several scans to determine collision risk, then experience-based judgment can be made, but real-time collision risk identification is difficult
Solution Approach 1:
The patent replaces the operator's manual observation and experience-based judgment with an automated system that continuously calculates relative velocity from phase differences and assesses collision risk in real-time. This substitution eliminates the need for operators to watch multiple scans while maintaining or improving judgment accuracy through objective computational analysis.
Solution Approach 2:
The patent implements continuous feedback by automatically updating velocity and collision risk assessments as new radar echoes are received. This real-time feedback loop provides immediate collision risk information without requiring operator observation time, replacing the several-scans-watching process with instantaneous automated evaluation.
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
Enables real-time identification and intuitive display of high-risk target objects, reducing the reliance on incomplete or delayed data sources and improving operator awareness of potential collisions.
Implementation Method 1
an antenna for transmitting an electromagnetic wave and receiving an echo signal from a target object
Implementation Method 2
The speed calculation module calculates the relative velocity of the target object based on a change in phases of at least two of the echo signals received at a different time
Data Source
AI summary
A radar device is disclosed, which includes an antenna for transmitting an electromagnetic wave and receiving an echo signal from a target object while rotating in a horizontal plane, a display module for displaying the target object so as to correspond the echo signal to a position of the target object with respect to the antenna, a speed calculation module for calculating a relative velocity of the antenna and the target object, and a risk level detection module for detecting a risk level of the target object based on the relative velocity of the target object calculated by the speed calculation module. The speed calculation module calculates the relative velocity of the target object based on a change in phases of at least two of the echo signals received at a different time. The display module controls a display mode of the target object based on the risk level.