MIMO Radar Chirp Scheduling to Reduce Velocity Aliasing
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Solution Overview
Problem
MIMO radar systems face a reduction in maximum velocity measurement range and increased likelihood of velocity aliasing due to a larger number of transmit antennas, affecting angular resolution and accuracy.
Innovation Solution
Implementing a signal transmission method with varying transmission densities and using a Chinese remainder method (staggered algorithm) to expand the velocity measurement range and reduce aliasing, by configuring transmit antennas to send chirp signals at different periods, including bursts with varying durations and co-prime intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a larger quantity of transmit antennas is used in TDM MIMO radar, then angular resolution is improved, but velocity aliasing increases
Solution Approach 1:
The system uses feedback from multiple measurement frames with different transmission densities to resolve velocity aliasing. By comparing velocity measurements from different bursts and using the Chinese remainder theorem, the system can identify and correct aliased velocity values, ensuring accurate velocity measurement
Solution Approach 2:
The patent changes transmission parameters dynamically by varying the transmission density of different antennas across multiple bursts. This parameter change creates diverse measurement conditions that help distinguish between aliased velocity values and the true velocity, reducing velocity aliasing while maintaining angular resolution
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
Accurately resumes the velocity measurement range of MIMO radar to that of a SIMO radar, ensuring accurate azimuth angle calculation and improved angular resolution.
Implementation Method 1
each of the Nt transmit antennas is configured to send a chirp (chirp) signal at a period of N1*T1
Implementation Method 2
a phase difference between receive antennas corresponding to a soft overlapping moment is determined only by a doppler (doppler) phase caused by a velocity of a target
Data Source
AI summary
The disclosure provides signal transmission methods, signal processing methods, apparatuses, and a radar system. One example signal transmission method is applied to a multiple input multiple output (MIMO) radar. A transmitter in the MIMO radar sends a measurement frame used to measure a velocity of a target. 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.