Radar Device Short-Range Target Detection Using Frequency Spectrum Analysis
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Solution Overview
Problem
Conventional radar devices face difficulties in detecting targets at short distances due to overlapping peaks in the frequency spectrum, where harmonic wave peaks obscure true target peaks, making it challenging to accurately determine target positions.
Innovation Solution
A radar device with a generating unit, estimating unit, and determining unit that generates a frequency spectrum from a beat signal, estimates peak frequencies based on past location information, and determines whether the peak frequency corresponds to a target by comparing power near the peak with a predetermined threshold, thereby distinguishing true target peaks from harmonic wave peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency spectrum analysis is used to detect target peaks, then target detection capability is improved, but harmonic wave peaks overlap with true target peaks at short distances, causing detection errors
Solution Approach 1:
The radar device performs preliminary action by predicting the expected peak frequency based on past location information before analyzing the current frequency spectrum. This prediction is made in advance to guide the subsequent detection process, allowing the system to focus on the predicted frequency region and compare actual power at that frequency with a threshold to determine target presence, thereby avoiding confusion with harmonic wave peaks.
2Ease of operation
If conventional peak detection is used in frequency spectrum, then detection process is simple, but targets at short distances cannot be detected due to peak overlap
Solution Approach 1:
The radar device implements feedback by using past location information to predict the expected peak frequency, then using this prediction to guide the current detection process. The system continuously updates the location information based on previous detections, creating a feedback loop that improves detection accuracy over time, especially for short distance targets where harmonic wave interference is problematic.
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 enhances the accuracy of detecting targets at short distances by effectively differentiating true target peaks from harmonic wave peaks, reducing the risk of false detection and improving tracking control in scenarios like vehicle congestion tracking.
Implementation Method 1
a radar device that transmits a frequency-modulated continuous-wave signal and calculates a distance to a target and a relative velocity to the target from a difference in frequency between a transmission wave and a reflected wave
Implementation Method 2
a radar device that detects a target on the basis of peaks of powers at respective frequencies obtained as a result of frequency analysis of a received signal
Data Source
AI summary
According to an embodiment, there is provided a radar device including a generating unit, an estimating unit, and a determining unit. The generating unit generates a frequency spectrum from a beat signal corresponding to a predetermined period. The estimating unit estimates a peak frequency corresponding to a target on the basis of location information of the target corresponding to a past period. The determining unit determines, with respect to the frequency spectrum corresponding to the latest period, whether the peak frequency is a peak corresponding to the target by comparing power near the peak frequency estimated by the estimating unit with a predetermined threshold.