Radar Device Multipath Ghost Detection
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Solution Overview
Problem
Conventional radar apparatuses face difficulties in distinguishing between a preceding vehicle and a 'mirror ghost' due to multipath interference, especially in narrow spaces or when the angle between the vehicle and the preceding vehicle is small, leading to inaccurate direction detection.
Innovation Solution
A radar apparatus equipped with multiple antennas that analyze reception waves for amplitude and phase, using signal processing techniques like DBF and MUSIC to differentiate between signals from the target and multipath reflections, thereby improving direction detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radar apparatus uses virtual wall method to detect mirror ghost, then mirror ghost detection capability is improved, but detection accuracy deteriorates when targets are separated by small angles or in narrow spaces
Solution Approach 1:
The patent changes the detection parameters from only amplitude-based virtual wall method to combined amplitude and phase parameter verification. By calculating expected phase values based on detected direction and comparing with actual phase values, the system can distinguish between real targets and mirror ghosts even when they are separated by small angles, thus improving measurement precision while maintaining reliability
Solution Approach 2:
The patent introduces phase information as an intermediary verification parameter between the target detection process and the final direction determination. This phase-based intermediary check allows the system to validate whether detected targets are genuine or mirror images without directly altering the detection algorithm, resolving the contradiction between detection capability and accuracy
2Adaptability or versatility
If radar detects target in intermediate direction between preceding vehicle and mirror ghost, then target detection coverage is improved, but direction measurement precision deteriorates
Solution Approach 1:
The patent implements a feedback verification mechanism where the detected direction is used to calculate expected phase values, which are then compared with actual measured phase values. This feedback loop allows the system to identify when a detected target is actually a mirror ghost and correct the direction measurement, maintaining both wide detection coverage and high measurement 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
The solution enables precise detection of the target's direction by comparing calculated and actual amplitudes and phases, preventing misidentification of the target's position and reducing errors caused by multipath interference.
Implementation Method 1
receive a reflected wave reflected by a target object by a plurality of antennas
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(c)
AI summary
A radar apparatus configured to receive a transmission wave reflected by a target object by a plurality of antennas, includes a signal analysis unit configured to analyze reception waves received by the respective antennas, and to obtain an amplitude and a phase of each of the reception waves received at the respective antennas, the amplitude and the phase being obtained at a frequency with which a reception strength shows a peak; a direction detection unit configured to detect a direction of the target object based on the phases of the reception waves received by the respective antennas; an estimated amplitude and phase output unit configured to output an estimated amplitude and an estimated phase of each of reception waves to be received by the respective antennas, assuming that the target object exists in the direction detected by the direction detection unit; and a comparison unit configured to compare at least one of the amplitudes and the phases for each of the antennas such that the amplitude obtained by the signal analysis unit is compared with the amplitude output by the estimated amplitude and phase output unit, and the phase obtained by the signal analysis unit is compared with the phase output by the estimated amplitude and phase output unit.