Radar Device Target Estimation Using Previous Cycle Data
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Solution Overview
Problem
Existing radar devices face challenges in accurately calculating distances and relative velocities to multiple targets due to mispairing of peak frequencies in beat signals, especially when noise, device variations, or other interference prevents the extraction of at least one peak frequency.
Innovation Solution
A radar device with a transmission part that radiates a signal with four modulation sections, a reception part that receives and mixes the signal, and a target detection part that includes peak frequency extraction, pair calculation, and decision-making components to estimate distances and velocities even when peak frequencies cannot be extracted, using previous cycle data for estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If peak frequency extraction is performed from beat signals to calculate distance and relative velocity, then measurement precision is improved, but reliability deteriorates when noise or interference prevents extraction of at least one peak frequency
Solution Approach 1:
The radar device performs frequency modulation in advance to generate beat signals with distinct frequency characteristics for different targets. By pre-structuring the transmission signal with specific modulation patterns (ascending and descending frequency sections), the system prepares the beat signals to contain sufficient information for target parameter calculation even when some peak frequencies are missing due to noise or interference.
Solution Approach 2:
The system uses feedback from the beat signal analysis to identify extracted peak frequencies and their corresponding targets. When at least one peak frequency cannot be extracted, the feedback mechanism triggers an alternative calculation mode that uses the available peak frequencies combined with prior target information to maintain reliable target detection and parameter estimation.
2Adaptability or versatility
If multiple targets are detected simultaneously, then adaptability is improved, but measurement precision deteriorates due to mispairing of peak frequencies
Solution Approach 1:
The radar device segments the detection process by associating peak frequencies with specific targets through systematic pairing. The transmission signal is divided into ascending and descending frequency sections, and the beat signals are segmented to identify which peak frequencies belong to which targets. This segmentation prevents mispairing by establishing clear correspondences between peak frequencies and their generating targets, enabling accurate parameter calculation even when multiple targets are present.
Solution Approach 2:
The system resolves the mispairing problem by introducing an additional dimension of information - using the temporal and frequency characteristics of beat signals across different modulation sections. Instead of relying solely on peak frequency magnitude, the system analyzes the dimensional relationships between peak frequencies from ascending and descending sections, target strength information, and temporal sequences to correctly pair frequencies with targets, thereby maintaining measurement precision in multi-target scenarios.
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
Prevents mispairing and allows accurate calculation of distances and relative velocities to targets, even when peak frequencies are not extractable, ensuring reliable target detection in complex scenarios.
Implementation Method 1
a transmission part for radiating a transmission signal having four modulation sections as a transmission wave
Implementation Method 2
a reception part for receiving a reflected wave resulting from reflecting the transmission wave by a target as a reception signal
Implementation Method 3
a mixing part for mixing the transmission signal and the reception signal together to generate a beat signal
Data Source
AI summary
Provided is a radar device capable of preventing mispairing from occurring, and obtaining a distance to a target and a relative velocity to the target even if at least one of the peak frequencies of beat signals cannot be extracted and pairs of the peak frequencies cannot be generated. A target estimation part (20) estimates a distance (RN) to a target (21, 22) and a relative velocity (VN) to the target (21, 22) based on a distance (RO) to the target (21, 22) and a relative velocity (VO) to the target (21, 22), which have been decided by a target decision part (13) in a previous cycle, when at least one of the peak frequencies of the beat signal cannot be extracted and the pair of the peak frequencies cannot be generated.