Software-Defined MIMO Radar for Flexible 4D Imaging
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Solution Overview
Problem
Prior millimeter wave (mmWave) radar imaging technologies for advanced driver-assistance systems (ADAS) and autonomous vehicles (AVs) face limitations in resolution and sensitivity due to the number of transmitters and receivers, and are inflexible in adapting to different operating environments, especially in dense scenarios with multiple AVs.
Innovation Solution
The implementation of a software defined radar architecture with a digital, multiple-input multiple-output (MIMO) radar system using a chipset that includes multiple transmitter and receiver chips, each with serial-deserializer (SerDes) circuitry for fully digital operation, enabling flexible transmission and reception of multiple waveforms and signals, and processing to achieve high-resolution four-dimensional (4D) radar imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of transmitters and receivers is increased to improve resolution and sensitivity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The radar system is divided into multiple transmit antennas and multiple receive antennas, creating a MIMO architecture where each antenna element can be independently controlled and processed. This segmentation allows the system to achieve high angular resolution through spatial diversity without requiring a single complex antenna structure.
Solution Approach 2:
The patent transitions from traditional single-dimensional or two-dimensional radar imaging to four-dimensional radar imaging by adding temporal and spectral dimensions. This is achieved through advanced signal processing of the multiple antenna signals, creating a virtual array that provides high-resolution imaging in range, azimuth, elevation, and Doppler frequency without proportionally increasing physical antenna count.
2Adaptability or versatility
If traditional radar architectures are used, then device complexity is reduced, but adaptability to different operating environments deteriorates
Solution Approach 1:
The radar system employs a universal MIMO architecture that can operate in multiple modes and adapt to different environmental conditions. The same hardware platform supports various waveform types, modulation schemes, and signal processing algorithms, allowing the system to function effectively in dense AV scenarios, open roads, adverse weather, and different lighting conditions without requiring hardware changes.
Solution Approach 2:
The radar system implements dynamic adaptability through software-defined radio (SDR) principles, where signal processing parameters, waveform characteristics, and detection algorithms can be dynamically adjusted based on the operating environment. This allows real-time optimization of radar performance for different scenarios such as urban canyons, highways, or adverse weather conditions.
3Reliability
If analog radar systems are used, then device complexity is reduced, but reliability deteriorates due to analog noise and interference
Solution Approach 1:
The patent replaces analog signal processing with digital signal processing throughout the radar system. Instead of using analog filters, amplifiers, and mixers that are susceptible to noise and interference, the system uses digital filters, processors, and algorithms that provide superior noise immunity and signal integrity. This digital substitution occurs from the antenna interface through to the final image processing stage.
Solution Approach 2:
The system introduces digital signal processing as an intermediary between the antenna reception and the final target detection. This digital intermediary layer includes steps such as digital down-conversion, filtering, Fourier transformation, and signal integration that effectively separate the desired radar signals from noise and interference, thereby improving reliability without requiring additional physical components.
Data Source
AI summary
Example software defined radar architectures are disclosed. Example chipsets disclosed herein to implement a software defined radar architecture include a digital processor chip including a first serial port and a second serial port. Disclosed example chipsets also include a transmitter chip to generate a plurality of transmit signals based on baseband radar waveform data to be obtained from the digital processor chip, the transmitter chip including a third serial port to communicate with the first serial port of the digital processor chip to obtain the baseband radar waveform data. Disclosed example chipsets further include a receiver chip to determine baseband received radar data from a plurality of radar signals, the receiver chip including a fourth serial port to communicate with the second serial port of the digital processor chip to provide the baseband received radar data to the digital processor chip.