Radar Signal Processing Device Multipath Altitude Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radar devices struggle to accurately determine the altitude of objects in multipath environments, leading to potential erroneous collision determinations due to the interference of direct and multipath waves.
Innovation Solution
A signal processing device that uses a single reception unit to acquire a reception signal of a reflected wave, generates a range Doppler map, calculates the standard deviation of the object's altitude, and determines the range interval of interference between direct and multipath waves to assess the possibility of collision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional radar device uses multiple sensor units to improve altitude estimation accuracy in multipath environments, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter of using multiple sensor units to a single sensor unit, and instead compensates for multipath interference by analyzing signal characteristics (standard deviation and range interval) in the received signal. This resolves the contradiction by maintaining measurement precision through parameter analysis rather than through multiple sensors.
Solution Approach 2:
The patent extracts and analyzes specific characteristics (standard deviation and range interval) from the received signal to identify multipath interference. By focusing on these extracted parameters, the system can determine object altitude accurately without needing multiple sensor units, thus resolving the contradiction between precision and complexity.
2Adaptability or versatility
If a conventional radar device operates in multipath environments, then it can detect objects at various altitudes, but measurement precision deteriorates due to direct wave and multipath wave interference
Solution Approach 1:
The patent converts the harmful effect of multipath wave interference into a useful indicator. By analyzing the standard deviation and range interval caused by interference patterns between direct and multipath waves, the system can actually determine object altitude more reliably. The interference that previously degraded precision is now used as a basis for accurate measurement.
Solution Approach 2:
The patent uses feedback from signal characteristic analysis (standard deviation and range interval calculations) to determine whether detected objects are at collision-risk altitudes. The system continuously monitors these parameters and adjusts its determination logic based on the observed interference patterns, maintaining precision in multipath environments.
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 accurate determination of object altitude and collision possibility in multipath environments using a single reception unit, improving the reliability of collision avoidance systems.
Implementation Method 1
a reception unit 1 that receives a reflected wave from an object present around a mobile object
Implementation Method 2
generate a range Doppler map indicating a signal strength level of the reception signal
Implementation Method 3
a range interval calculating unit 14 that calculates a range interval at which a direct wave from the object included in the reflected wave and a multipath wave from the object included in the reflected wave interfere with each other
Data Source
AI summary
A signal processing device is configured to include a map generating unit to acquire a reception signal of a reflected wave from a reception unit that receives the reflected wave by an object present around a mobile object, and generate a range Doppler map indicating a signal strength level of the reception signal, and an altitude standard deviation calculating unit to calculate a standard deviation of an altitude at which the object is present on a basis of the range Doppler map generated by the map generating unit. Further, the signal processing device includes a collision determining unit to determine whether or not the object is present at a height at which there is a possibility of collision between the mobile object and the object on the basis of the standard deviation calculated by the altitude standard deviation calculating unit.