Radar Signal Processing Using Shielding Length for Height Measurement
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Solution Overview
Problem
Conventional radar systems face the risk of antenna damage due to wave impact when installed near water surfaces, and using three-dimensional radars to avoid this issue increases cost and complexity.
Innovation Solution
A radar system that calculates shielding lengths and heights using oblique beam radiation and shielding object positions, allowing the antenna to be installed away from the water surface, thus avoiding wave impact without the need for complex three-dimensional systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the antenna is installed near the water surface to achieve accurate height measurement, then measurement precision is improved, but the antenna may suffer wave impact causing malfunction or damage
Solution Approach 1:
The patent introduces a shielding length measurement dimension (horizontal distance from antenna to shadow edge) to enable height calculation without requiring the antenna to be positioned close to the water surface. By measuring the shielding length created by the antenna's oblique beam and applying geometric relationships, the system calculates water surface height from a safe elevated position, thus resolving the contradiction between measurement precision and reliability
2Reliability
If a three-dimensional radar is used to avoid wave impact, then antenna reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and utilizes the shielding effect created by the antenna's own oblique beam as a measurement tool. By measuring the shielding length (horizontal distance from antenna to the edge of the shadow region on the water surface) and applying geometric calculations based on the known beam angle, the system derives height information without requiring complex three-dimensional radar mechanisms, thus maintaining simplicity while ensuring reliability
3Reliability
If the antenna is installed away from the water surface to avoid wave impact, then antenna reliability is improved, but measurement precision deteriorates
Solution Approach 1:
The patent introduces the shielding length measurement as an intermediary parameter that bridges the gap between antenna position and water surface height. By measuring the horizontal shielding length created by the oblique beam and using geometric relationships (tanθ = height/shielding length), the system accurately calculates height from a safe distance, thus maintaining both reliability and precision
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 enables accurate height calculation of targets while preventing antenna damage at low cost by using a simpler radar configuration.
Implementation Method 1
an antenna that transmits and receives radio waves
Data Source
AI summary
A radar signal processing device includes: a shielding length calculating unit (61) which calculates, based on a reception signal received by an antenna that transmits and receives radio waves, a shielding length (L2), which is the horizontal length of a region where a transmission signal transmitted from the antenna is shielded by a shielding object (13) above a reference plane; and a vertical height calculating unit (62) which calculates, based on the shielding length and the positional relationship between the shielding object and the antenna, the height (H2) of the shielding object from the reference plane.