Radar Waveform Dynamic Doppler Resolution
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Solution Overview
Problem
Conventional radar systems in autonomous vehicles face latency issues in signal processing, particularly in estimating Doppler information, which affects the accuracy and reliability of object detection and tracking, especially in adverse weather conditions.
Innovation Solution
The described technique reduces latency by initiating Doppler processing before all ramps in a reflected signal have been received, allowing for early estimation of Doppler information in short ranges where high resolution is less critical, and maintaining sensitivity in longer ranges by adjusting the start time and size of Doppler FFT processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Doppler processing is performed after receiving all ramps in the reflected signal, then Doppler resolution is improved, but processing latency increases
Solution Approach 1:
The patent applies preliminary action by performing Doppler processing on a subset of ramps before receiving all ramps in the reflected signal. This allows the radar system to initiate Doppler estimation earlier, reducing processing latency while maintaining adequate Doppler resolution for the application
2Measurement precision
If the FMCW signal duration is extended, then Doppler resolution and sensitivity are improved, but processing latency increases
Solution Approach 1:
The patent performs Doppler processing on a subset of ramps received during the FMCW signal duration, rather than waiting for the complete signal. This preliminary processing approach reduces latency while the extended signal duration continues to provide improved Doppler resolution and sensitivity
Solution Approach 2:
The patent segments the FMCW signal into subsets of ramps, processing Doppler information from the first subset before receiving the remaining ramps. This segmentation allows earlier processing initiation while maintaining the benefits of the full signal duration for resolution
3Loss of time
If Doppler processing is initiated early on a subset of ramps, then processing latency is reduced, but Doppler resolution deteriorates
Solution Approach 1:
The patent applies partial action by performing Doppler processing on a subset of ramps rather than requiring all ramps. This provides sufficient Doppler resolution for the application while enabling earlier processing and reduced latency
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 significantly reduces overall processing time while maintaining radar sensitivity and accuracy, enabling timely and reliable object detection and tracking in real-time driving scenarios.
Implementation Method 1
Radar sensors are conventionally used in connection with detecting and classifying objects in an environment
Implementation Method 2
to estimate the Doppler information for the detected object
Data Source
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AI summary
A radar system comprises a receive antenna that receives a radar return, and circuitry configured to perform certain acts. The acts comprise processing the radar return to generate a radar signal comprising a plurality of ramps. The acts also comprise performing range fast Fourier transform (FFT) processing on the ramps as the ramps are received. The acts further comprise performing Doppler FFT processing on received ramps prior to receipt of all ramps in the radar signal. The acts also comprise outputting range and Doppler data.