Radar Peak Signal Extraction via Dual-Range Estimation
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Solution Overview
Problem
Radar devices face challenges in accurately extracting history peak signals when widening the frequency range, leading to erroneous detection of peak signals not belonging to the same target, resulting in incorrect target location detection.
Innovation Solution
A radar device with an extracting unit for peak signals from frequency differences between transmission and reception signals, an estimating unit for current peak signals, a first setting unit for initial frequency ranges, and a second setting unit for widening the range if peak signals are not extracted in the initial period, allowing re-extraction in a second range to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the predetermined frequency range is widened to extract peak signals, then the probability of extracting history peak signals increases, but the risk of erroneously extracting non-history peak signals also increases
Solution Approach 1:
The frequency range extraction process is divided into two distinct stages: a first frequency range extracted by the extracting unit using estimation from the estimating unit, and a second frequency range extracted by the re-extracting unit when peak signals are missed in the first range. This segmentation allows the system to maintain a narrow initial range for accuracy while providing a fallback mechanism to prevent signal loss, thereby resolving the contradiction between extraction probability and error risk.
Solution Approach 2:
The estimating unit performs preliminary estimation of peak signal frequencies before the actual extraction process. This preliminary action establishes expected frequency locations, allowing the extracting unit to focus on specific frequency bins rather than scanning the entire spectrum. When combined with the second frequency range extraction, this preliminary estimation ensures that even when the first range is too narrow, the system can reliably identify the correct peak signals without erroneous detections.
2Reliability
If the first frequency range is set narrowly based on estimation, then erroneous extraction is reduced, but history peak signals may be missed when targets undergo sudden changes
Solution Approach 1:
The system dynamically adjusts the extraction strategy based on whether peak signals are successfully extracted in the first frequency range. When the target undergoes sudden changes causing peak signals to fall outside the estimated range, the system transitions to the second frequency range extraction. This dynamic adaptation allows the system to maintain high reliability under normal conditions while ensuring history peak signals are not missed during sudden target changes.
Solution Approach 2:
The system changes the frequency range parameter from the first frequency range to the second frequency range when peak signals are not extracted in the initial range. This parameter change allows the system to expand its search scope only when necessary, maintaining narrow range benefits during stable conditions while ensuring comprehensive coverage when targets undergo sudden changes, thus resolving the contradiction between reliability and detection accuracy.
Data Source
AI summary
There is provided a radar device. An extracting unit is configured to extract peak signals from a frequency difference between a transmission signal and a reception signal, in a first range of each of a first period and a second period. An estimating unit is configured to estimate a current peak signal on the basis of a previous peak signal extracted by the extracting unit. A first setting unit is configured to set the first range on the basis of the estimation result. A second setting unit is configured to set a second range different from the first range, if the peak signal is extracted in the first range of the second period and the peak signal cannot be extracted in the first range of the first period. A re-extracting unit is configured to extract the peak signal in the second range of the first period.