MIMO Radar Beamforming via Phase Shift Noise Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Radar devices with MIMO technology face increased complexity and reduced target detection ability due to the need for signal processing to generate and apply a whitening matrix, which complicates noise power management across different beams.
Innovation Solution
The radar device shifts the phase of the MIMO signal and adjusts weighting coefficients based on phase shifts to manage noise power across beams, eliminating the need for whitening matrix generation and multiplication processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal processing for generating and applying a whitening matrix is performed to manage noise power, then noise power balance across beams is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the whitening matrix generation and application processes from the signal processing chain. By removing these complex computational steps while maintaining noise power balance through alternative means, the invention resolves the contradiction between reliability improvement and device complexity reduction.
Solution Approach 2:
The invention changes the approach from computational parameter adjustment (whitening matrix) to physical parameter optimization (weighting coefficients and beamforming parameters). This parameter substitution maintains noise power management effectiveness while reducing computational complexity and device requirements.
2Reliability
If whitening matrix generation and multiplication processes are executed, then noise power uniformity is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary optimization of weighting coefficients and beamforming parameters before signal processing to pre-establish noise power uniformity. This preliminary action eliminates the need for time-consuming whitening matrix computations during real-time processing, thereby maintaining noise uniformity while reducing processing time.
Solution Approach 2:
The invention replaces the computationally expensive and time-consuming whitening matrix operations with simpler, faster weighting coefficient adjustments. This substitution uses less computationally intensive methods that achieve the same noise power uniformity goal with significantly reduced processing time.
3Measurement precision
If multiple signal processing steps are performed, then detection accuracy is improved, but computational load increases
Solution Approach 1:
The patent merges the functions of noise power management and target detection into a unified beamforming process with optimized weighting coefficients. By combining these previously separate processing steps into one integrated operation, the invention maintains detection accuracy while reducing computational load and simplifying the processing chain.
Solution Approach 2:
The optimized weighting coefficients serve multiple functions simultaneously: they perform beamforming, noise power balancing, and detection optimization in a single operation. This multi-functionality eliminates the need for separate whitening matrix processing steps, thereby maintaining detection accuracy while reducing overall computational requirements.
Data Source
AI summary
A radar device includes: a signal transmission unit for generating a MIMO signal including a plurality of pulse signals, and radiating the MIMO signal into space; a signal reception unit for receiving a reflection signal resulting from reflection, by a target, of the MIMO signal radiated from the signal transmission unit; a demodulation unit for demodulating the MIMO signal from the reflection signal received by the signal reception unit; a beam-forming unit for forming beams in a plurality of different directions, by multiplying the plurality of pulse signals included in the MIMO signal demodulated by the demodulation unit by a respective plurality of different weighting coefficients; a control unit for changing noise power included in each of the beams in the plurality of directions formed by the beam-forming unit, by shifting a phase of the MIMO signal generated by the signal transmission unit and adjusting the plurality of weighting coefficients on the basis of an amount of phase shift of the phase; and a target detection unit for detecting the target from each of the beams in the plurality of directions formed by the beam-forming unit.