MIMO Radar Chirp Frequency Offsets for DDM Channel Separation
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Solution Overview
Problem
Existing MIMO radar systems face challenges in achieving large virtual array synthesis with high resolution and accurate identification of corresponding transmitters, particularly in co-located configurations where radar signals from different transmit channels are indistinguishable.
Innovation Solution
Implementing a Doppler Division Multiplexing (DDM) scheme in MIMO radar systems by varying the start and stop frequencies of FMCW radar chirps across multiple transmit channels and applying unique phase sequences to each channel, allowing for concurrent transmission and separation of signals based on phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmit channels transmit FMCW radar chirps with identical start and stop frequencies concurrently, then the system achieves high productivity through parallel transmission, but the signals from different transmit channels become indistinguishable, worsening measurement precision
Solution Approach 1:
The patent applies parameter changes by varying the start and stop frequencies of FMCW radar chirps across different transmit channels. Specifically, each transmit channel is assigned a unique frequency configuration (different start frequencies, stop frequencies, or both), which allows concurrent transmission while maintaining signal distinguishability. This frequency parameter differentiation enables the receiver to identify the transmit channel of each reflected signal, resolving the contradiction between parallel transmission capability and channel identification accuracy.
2Ease of operation
If FMCW radar chirps have fixed start and stop frequencies, then the system achieves ease of operation with simple transmission control, but the effective modulation bandwidth is limited, worsening range resolution
Solution Approach 1:
The patent implements dynamics by transitioning from fixed frequency chirps to variable frequency chirps. The system dynamically adjusts the start and stop frequencies of FMCW radar chirps across different transmit channels and time slots. This dynamic frequency variation increases the effective modulation bandwidth, thereby improving range resolution while maintaining manageable complexity through systematic frequency assignment patterns.
3Ease of manufacture
If transmit channels use the same frequency bandwidth, then the system achieves ease of manufacture with uniform channel configuration, but the virtual array synthesis resolution is limited, worsening measurement precision
Solution Approach 1:
The patent applies local quality by assigning different frequency characteristics to different transmit channels. Instead of uniform frequency bandwidth across all channels, each transmit channel is configured with specific start and stop frequencies tailored to its role in the MIMO system. This localized frequency differentiation enables higher resolution virtual array synthesis while maintaining systematic configuration that balances manufacturing 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 enhances effective modulation bandwidth, improving range resolution and enabling precise identification of transmit channels, thereby optimizing the virtual array synthesis and target detection capabilities.
Implementation Method 1
a first sequence of FMCW radar chirps, start and/or stop frequencies of each of at least a portion of the FMCW radar chirps of the first sequence are different from each other
Implementation Method 2
controlling the first and second transmit channels to set phases of the FMCW radar chirps of the first sequence and the second sequence in accordance with a predefined Doppler Division Multiplex (DDM) scheme
Implementation Method 3
Automotive radar systems enable the detection of objects and obstacles, their position, and speed relative to a vehicle
Data Source
AI summary
The present disclosure relates to a MIMO radar apparatus, comprising a transmitter circuit configured to transmit, via a first transmit channel, a first sequence of FMCW radar chirps such that start and/or stop frequencies of each of at least a portion of the FMCW radar chirps of the first sequence are different from each other. The transmitter circuit is configured to transmit, via a second transmit channel, a second sequence of FMCW radar chirps, wherein start and/or stop frequencies of each of at least a portion of the FMCW radar chirps of the second sequence are different from each other. The first and the second sequence of FMCW radar chirps are transmitted concurrently. Control circuit is configured to control the first and second transmit channels to set phases of the FMCW radar chirps of the first sand second sequences in accordance with a predefined Doppler Division Multiplex scheme.