Radar Wave Type Estimation for Interference
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Solution Overview
Problem
Radar apparatuses struggle to accurately detect the position of objects when multiple reflected waves interfere, leading to incorrect calculations and potentially unnecessary vehicle control, especially when waves from different objects or surfaces combine.
Innovation Solution
A radar apparatus that distinguishes between single and composite reflected waves by analyzing amplitude levels from multiple antennas, using threshold values and different calculation methods based on wave types to accurately determine object positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase monopulse technique is used to detect object position based on phase difference between reflected waves received by multiple antennas, then the radar apparatus can detect the position of objects in horizontal and vertical directions, but when multiple reflected waves from different objects interfere to form composite waves, the radar apparatus cannot correctly detect the positions of the objects
Solution Approach 1:
The invention segments the detection process by first identifying whether received signals are single reflected waves or composite waves formed by interference. The signal processing section separates the analysis of single reflected waves from composite waves, applying different detection methods to each type. This segmentation allows the system to handle interference conditions separately, improving overall detection reliability when multiple objects are present.
Solution Approach 2:
The invention changes the detection parameter from relying solely on phase difference to also considering signal intensity relationships. By comparing the intensities of reflected waves received by different antennas and determining threshold relationships, the system can identify composite waves and switch to alternative detection methods, thereby maintaining measurement precision under interference conditions.
2Productivity
If the radar apparatus calculates object position based on phase information of composite waves formed by interfering reflected waves, then the calculation can proceed continuously, but the detected position information becomes inaccurate
Solution Approach 1:
The invention implements a dynamic detection approach where the system continuously monitors signal characteristics and adapts its detection method based on the current signal type. When composite waves are detected through intensity comparison, the system dynamically switches from phase-based monopulse detection to alternative methods, ensuring both continuous operation and accurate position detection under varying conditions.
Solution Approach 2:
The invention introduces an intermediate analysis step that examines signal intensity relationships before performing position calculation. This intermediary process identifies whether the received signals are single or composite waves, serving as a mediator that directs the subsequent detection approach. This intermediate step prevents inaccurate position calculations by filtering out composite wave cases from phase-based detection.
3Duration of action of moving object
If reflected waves from different routes (direct reflection and road reflection) interfere to form composite waves, then the radar apparatus receives continuous signals, but the position detection accuracy deteriorates
Solution Approach 1:
The invention segments the signal analysis by separating direct reflected waves from composite waves that include road reflections. By comparing signal intensities across multiple antennas and identifying interference patterns, the system isolates cases where multiple reflection routes are present, allowing continuous signal reception while maintaining accurate position detection by excluding composite wave cases from standard phase-based calculation.
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 detection of object positions by correctly identifying wave types and adjusting calculation methods, preventing unnecessary vehicle control and improving driver comfort.
Implementation Method 1
a radar apparatus which radiates an electromagnetic wave, receives a reflected wave caused by the electromagnetic wave reflected from an object
Implementation Method 2
an electromagnetic wave radiating section configured to radiate the electromagnetic wave
Implementation Method 3
reflected waves that have occurred at the plurality of objects interfere with each other to cause a composite wave
Data Source
AI summary
Provided is a radar apparatus capable of accurately calculating the presence direction of an object. The radar apparatus radiates an electromagnetic wave, receives a reflected wave caused by the electromagnetic wave reflected from the object, and detects the presence direction of the object. The radar apparatus includes: an electromagnetic wave radiating section configured to radiate the electromagnetic wave; a reflected wave reception section configured to receive the reflected wave and detect information about the received reflected wave; and a reflected wave type estimation section configured to determine which the type of the received reflected wave received by the reflected wave reception section is, a single reflected wave which is just reflected from an object, or a composite reflected wave which is composed of a plurality of reflected waves, reflected from different objects, that have interfered with each other, based on the information about the received reflected wave.