Radar Direction Calculation Using Summed Correlation Matrices
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Solution Overview
Problem
Existing radar devices face challenges in securing a sufficient number of snapshots quickly and calculating the direction to a target with high precision, especially in mobile applications where the positional relationship with the target varies, leading to reduced estimation precision due to high correlation among incoming waves.
Innovation Solution
A radar device that transmits a signal with multiple modulation sections, uses an array antenna to receive and mix signals, and calculates the direction based on a summed correlation matrix generated from peak frequency spectra of these sections, allowing for rapid snapshot acquisition and improved precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of snapshots is increased to suppress correlation among incoming waves, then the estimation precision of incoming direction is improved, but the time required to secure the number of snapshots increases
Solution Approach 1:
The transmission signal is divided into multiple modulation sections (first modulation section, second modulation section, etc.), each producing a correlation matrix. By segmenting the signal processing into separate modulation sections, the system can accumulate multiple correlation matrices from different sections without requiring multiple separate measurement periods, thus securing the number of snapshots in short time while maintaining high estimation precision.
2Quantity of substance
If correlation matrixes from past measurements are used to secure the number of snapshots, then the snapshot number is increased, but the positional relationship with target varies leading to reduced precision
Solution Approach 1:
Multiple correlation matrices are generated in advance from different modulation sections of the transmission signal before the actual direction estimation. This preliminary generation of multiple correlation matrices from the same measurement period allows the system to secure the required number of snapshots without waiting for multiple past measurements, thereby avoiding the problem of varying positional relationships while maintaining high precision.
3Quantity of substance
If reception vectors from frequencies other than peak frequency are used to secure the number of snapshots, then the snapshot number is increased, but the calculation becomes complicated and direction calculation precision decreases
Solution Approach 1:
The invention extracts and uses only the peak frequency spectra from each modulation section to generate correlation matrices, rather than using all frequency components. By taking out only the essential peak frequency information, the system secures the number of snapshots while keeping the calculation simple and maintaining high direction calculation precision, avoiding the complexity introduced by processing all frequency components.
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 enables securing the snapshot number in a short time and calculating the target direction with higher precision by utilizing correlation matrices from peak frequency spectra, enhancing the accuracy of angle estimation.
Implementation Method 1
receiving a reflection signal based on the transmission signal from the target by plural receiving units
Implementation Method 2
a transmission signal having continuously-modulated frequencies is transmitted to a target
Data Source
AI summary
In a radar device including a transmitting unit for transmitting a transmission signal having plural modulation sections, a receiving unit for receiving a reflection signal obtained through reflection of the transmission signal from a target by an array antenna having plural channels, a mixing unit for mixing the transmission signal with reception signals of the plural channels to obtain beat signals of the plural channels, a frequency analyzing unit for frequency-analyzing the beat signals of the plural channels, and a direction calculating unit for calculating the direction to the target on the basis of frequency analysis results of the plural channels, the direction calculating unit adds correlation matrixes generated from peak frequency spectra of the plural modulation sections to obtain an summed correlation matrix, and calculating the direction to the target on the basis of the summed correlation matrix.