Radar Receive Power Calculation Using Vector Decomposition
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Solution Overview
Problem
Existing radar devices face challenges in accurately calculating receive power when multiple targets are present, leading to mispairing and reduced precision in electronic scan radar systems, especially with a small number of receive antennas or snapshots.
Innovation Solution
The radar device employs a method that calculates receive power using vector decomposition based on mode vectors and orthogonal components, bypassing the spatial average method to accurately determine power values even with multiple targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the spatial average method is used for preprocessing of angle estimation, then the cross correlation components can be removed, but when there are multiple targets, the cross correlation components of the targets cannot be removed and the receive power cannot be accurately calculated
Solution Approach 1:
The patent extracts and removes cross correlation components between different targets through a specific calculation process. The receive power calculation unit calculates the receive power by extracting the cross correlation component between transmit and receive signals, then removing the cross correlation component between receive signals of different antennas, thereby obtaining the accurate receive power of each target independently
Solution Approach 2:
The patent performs preliminary calculation and storage of cross correlation components before final power calculation. The system pre-calculates the cross correlation components between receive signals of different antennas and stores them, then uses these pre-calculated components to accurately compute the receive power by subtracting the appropriate cross correlation terms from the total received power
2Measurement precision
If the Capon method is used to calculate power, then the power of reflected waves can be accurately calculated, but when there are multiple targets, the cross correlation components are not removed and accurate power calculation becomes impossible
Solution Approach 1:
The patent segments the power calculation process into distinct components: total received power, cross correlation power between different targets, and individual target power. By dividing the calculation into these segments, the system can accurately isolate and calculate the power of each target by subtracting the cross correlation components from the total power
Solution Approach 2:
The patent introduces cross correlation components as an intermediary element in the power calculation process. These components serve as a mediator that connects the total received power to the individual target powers, allowing the system to accurately determine each target's power by using the cross correlation terms as intermediate calculation steps
3Device complexity
If there are a small number of receive antennas or snapshots, then the system is simpler, but the receive power cannot be accurately calculated when multiple targets are present
Solution Approach 1:
The patent changes the calculation parameters by introducing a specific formula that accounts for cross correlation components. Instead of relying on the number of antennas or snapshots to ensure accuracy, the system changes the mathematical parameters of the power calculation by explicitly incorporating and removing cross correlation terms, thereby achieving accurate power calculation regardless of the number of antennas or snapshots
Data Source
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AI summary
An electronic scan type radar device which uses a high resolution performance processing to estimate directions of arrival of radio waves, wherein powers of arrival waves received for targets are accurately calculated, that is, a vehicle-mounted radar device utilizing electronic scan which uses a predetermined angle estimation system to estimate directions of arrival of reflected waves, comprising finding mode vectors for angles calculated from the receive signals of the antennas, decomposing a vector of the receive signals into directions of the mode vectors, and defining the lengths of the decomposed vectors the receive powers of the reflected waves arriving from the targets. Due to this method, even if there are targets, it is possible to accurately calculate the powers of the arrival waves, whereby pairing is accurately performed, the precision of detection of targets is improved, and erroneous operation of a vehicle-mounted radar device utilizing electronic scans is prevented.