Fractalet Radar Waveform Generation for Resolution and Foliage Penetration
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Solution Overview
Problem
Current automotive radar systems face limitations in dense environments due to limited penetration in foliage or snow and high clutter levels, which can mask targets of interest, especially at higher frequencies.
Innovation Solution
The use of fractalet radar waveforms, modeled after a fractal pattern, which combine both high and low frequency components to provide improved detection and resilience to noise and clutter, allowing for better penetration and target identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high frequency RADAR signals are used, then spatial resolution is improved, but penetration capability in dense foliage or snow deteriorates
Solution Approach 1:
The patent combines multiple frequency bands (e.g., 24 GHz and 77 GHz) into a single RADAR waveform. The lower frequency component (24 GHz) provides penetration capability through dense foliage and snow, while the higher frequency component (77 GHz) provides spatial resolution. By merging these frequency components into one waveform, the system achieves both penetration and resolution simultaneously, resolving the contradiction between the two parameters.
2Measurement precision
If high frequency RADAR signals are used, then spatial resolution is improved, but clutter levels increase
Solution Approach 1:
The patent merges lower frequency (better penetration, lower clutter) and higher frequency (better resolution) components into a single waveform. The lower frequency portion reduces clutter interaction while the higher frequency portion maintains spatial resolution, thereby resolving the contradiction between resolution and clutter levels.
3Device complexity
If single frequency band RADAR architecture is used, then device complexity is reduced, but adaptability to different environments deteriorates
Solution Approach 1:
The patent creates a universal RADAR waveform that functions effectively across multiple environments by incorporating multiple frequency bands. This single multifunctional waveform can adapt to different scenarios (open roads, dense foliage, snow) without requiring separate dedicated systems, thereby achieving environmental adaptability while maintaining relatively simple architecture.
Data Source
AI summary
A radio detection and ranging (RADAR) sensor system signal generator is disclosed. The signal generator includes a lower frequency oscillator circuit to generate a first reference signal having a first frequency, a higher frequency oscillator circuit to generate a second reference signal having a second frequency that is higher than the first frequency, a set of frequency multipliers and signal mixers coupled to receive the first reference signal and the second reference signal, the set of frequency multipliers and signal mixers to generate a plurality of baseline signals, voltage-to-frequency converters to generate radar frequency waveforms at a plurality of specified frequencies according to chirp parameters for a plurality of frequency bands, and modulating radio frequency mixers to mix the plurality of baseline signals with the radar frequency waveforms at the plurality of specified frequencies to generate a multifrequency wavelet RADAR waveform.