Radar Direction Determination Using MIMO-SIMO Velocity Ambiguity Correction
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Solution Overview
Problem
Radar systems face ambiguity in determining direction information due to relative velocity exceeding the maximum velocity limit, leading to incorrect compensation and errors in angle determination.
Innovation Solution
A method that involves multiple receive and transmit antennas to process detection information using MIMO and SIMO schemes, performing angle determinations, and comparing them to identify and correct velocity ambiguities, thereby compensating for phase differences and improving direction information accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar signals are transmitted via different transmit antennas one after the other in time, then direction information can be determined using phase difference, but ambiguity occurs when relative velocity exceeds maximum velocity leading to incorrect compensation
Solution Approach 1:
The patent combines MIMO angle determination (using phase difference from multiple transmit and receive antennas) with SIMO angle determination (using signal strength from multiple receive antennas) to create a hybrid approach. By merging these two methods, the system can detect velocity ambiguities in MIMO measurements and correct them using SIMO verification, thereby resolving the reliability issue when velocity exceeds maximum limits
Solution Approach 2:
The patent implements a feedback mechanism where the SIMO angle determination serves as a reference to verify and correct MIMO angle determination results. When velocity ambiguity is detected in the MIMO measurement, the system uses the SIMO measurement as feedback to identify and correct the erroneous velocity compensation, ensuring reliable direction information even at high velocities
2Measurement precision
If phase difference compensation is performed based on relative velocity, then direction information accuracy is improved, but incorrect compensation occurs when velocity exceeds maximum velocity limit
Solution Approach 1:
The patent performs preliminary velocity measurement and compensation using MIMO phase difference analysis before final angle determination. By conducting the compensation action in advance and then verifying it with SIMO measurements, the system can identify and correct velocity information errors before they propagate to the final direction information, preventing loss of accurate velocity data
3Measurement precision
If multiple transmit and receive antennas are used for MIMO transmission, then direction information can be determined, but device complexity increases
Solution Approach 1:
The patent segments the angle determination process into two distinct parts: MIMO angle determination for high-precision phase-based measurement and SIMO angle determination for verification. This segmentation allows each method to be optimized independently and enables the system to use the simpler SIMO method as a fallback when MIMO measurements are ambiguous, thereby managing overall system complexity
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 allows for accurate determination of direction information by verifying and correcting relative velocity measurements, reducing errors caused by ambiguity and enhancing the radar system's resolving power.
Implementation Method 1
the difference in transit time (and thus the phase difference) can also be influenced on the basis of a relative velocity between the object and the vehicle
Data Source
AI summary
A method for determining direction information for at least one target object in a radar system for a vehicle. The first detection information is provided by at least two receive antennas of the radar system, wherein the first detection information is specific for a first radar signal transmitted by a first transmit antenna of the radar system. The second detection information is provided by the at least two receive antennas of the radar system, wherein the second detection information is specific for a second radar signal transmitted by a second transmit antenna of the radar system. A first angle determination and a second angle determination are performed. At least one comparison of the first angle information with the second angle information is performed in order to detect an ambiguity in the first angle determination for the determination of the direction information.