Multi-mode MIMO Radar Sensor Antenna Configuration
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Solution Overview
Problem
Current MIMO radar systems face challenges in efficiently operating in multiple modes, such as short-range, mid-range, and long-range radar modes, due to the need for separate high and low gain antennas, which increases size, cost, and power consumption, while also suffering from lower signal-to-noise ratio in long-range modes.
Innovation Solution
The implementation of multi-mode MIMO radar sensors that use the same transmitter chains to generate signals for different modes by activating different sets of transmitter antenna elements, maintaining consistent phase center distances across modes, allowing for the same virtual array geometry and processing algorithm, thereby reducing physical size, power consumption, and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate high gain and low gain antennas are used for different radar modes, then the radar system can operate in multiple ranges, but the physical size, cost, and power consumption increase
Solution Approach 1:
The patent implements multi-mode operation by enabling a single antenna array to function in both short-range and long-range modes through dynamic configuration. The same physical antenna elements are reused across different operating modes, eliminating the need for separate high-gain and low-gain antenna sets. This universal approach allows the radar system to adapt to multiple detection ranges while maintaining consistent hardware architecture, thereby reducing complexity, size, and cost.
Solution Approach 2:
The system dynamically switches between short-range and long-range modes by adjusting the activation state of specific antenna elements within the same array. Rather than using fixed separate antennas for different ranges, the patent employs dynamic configuration where antenna elements can be selectively activated or deactivated based on the required operating mode, enabling flexible adaptation without hardware changes.
2Adaptability or versatility
If separate high gain and low gain antennas are used for different radar modes, then the radar system can operate in multiple ranges, but power consumption increases
Solution Approach 1:
The same antenna array serves multiple functions across different operating modes, eliminating the need to power separate high-gain and low-gain antenna systems. By reusing the same hardware infrastructure for both short-range and long-range detection, the system reduces overall power consumption while maintaining multi-mode operational capability.
Solution Approach 2:
The system dynamically activates only the necessary antenna elements for the current operating mode, avoiding the continuous power consumption that would result from maintaining separate antenna systems ready for different ranges. This dynamic activation strategy optimizes energy usage by ensuring that only required components are powered at any given time.
3Adaptability or versatility
If separate high gain and low gain antennas are used for different radar modes, then the radar system can operate in multiple ranges, but the signal-to-noise ratio decreases in long-range modes
Solution Approach 1:
The patent resolves the signal-to-noise ratio issue by transitioning from a spatial dimension solution (separate physical antennas with different gains) to a signal processing dimension solution. Virtual array synthesis and digital beamforming techniques are employed to achieve the required signal enhancement and directional sensitivity for long-range detection using the same physical antenna elements, thereby maintaining high signal-to-noise ratio without requiring separate high-gain antennas.
Data Source
AI summary
Multi-mode multi-input multi-output (MIMO) radar sensors are described herein. An example MIMO radar sensor includes a receiver module including an array of receiver antenna elements to receive radar signals and a transmitter module including an array of transmitter antenna elements. Groups of the transmitter antenna elements form transmitter chains. The example MIMO radar sensor further includes a control system to, in a first mode, activate a first set of the transmitter antenna elements of each of the transmitter chains, and, in a second mode, activate a second set of the transmitter antenna elements of each of the transmitter chains, where the second set is larger than the first set. The transmitter antenna elements are arranged such that distances between phase centers of the transmitter chains in the first mode and the second mode are the same.