MIMO Radar Chirp Scheduling for Velocity Aliasing Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
MIMO radar systems face a reduction in maximum velocity measurement range and increased likelihood of velocity aliasing due to the use of multiple transmit antennas, which affects angular resolution and accuracy.
Innovation Solution
Implementing a signal transmission method with varying densities of chirp signal transmission across transmit antennas, utilizing a frequency modulated continuous wave (FMCW) measurement frame with bursts of chirp signals, and employing a Chinese remainder method to expand the velocity measurement range and reduce aliasing coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple transmit antennas send chirp signals in TDM manner to expand virtual antenna aperture, then angular resolution is improved, but velocity aliasing increases
Solution Approach 1:
The transmission density is made dynamic by varying it across different bursts and antennas rather than using a uniform static pattern. This dynamic adjustment of transmission parameters allows the system to adapt and eliminate velocity aliasing while preserving the angular resolution benefits of multiple antennas
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
The method enhances the MIMO radar's velocity measurement range to match that of a SIMO radar, improves angular resolution, and reduces calculation complexity by minimizing velocity aliasing.
Implementation Method 1
a frequency modulated continuous wave (FMCW) measurement frame
Implementation Method 2
a phase difference between receive antennas corresponding to a soft overlapping moment is determined only by a doppler phase caused by a velocity of a target
Data Source
Figure 1
Figure 2
Figure 3~8
AI summary
A signal transmission method and apparatus (1300), a signal processing method and apparatus (1400), and a radar system (1500) are provided, so that a MIMO radar can accurately resume a velocity of a target to a velocity measurement range of a SIMO radar. The signal transmission method is applied to a multiple input multiple output MIMO radar. A transmitter (1301, 1501) in the MIMO radar sends a measurement frame used to measure a velocity of a target (S301). The measurement frame includes a first burst. In the first burst, each low-density transmit antenna sends one chirp signal in each timeslot, and at least one high-density transmit antenna sends more chirp signals in additional timeslots.