Virtual Doppler Radar Using Dynamic Chirp Patterns
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Solution Overview
Problem
Doppler-based analysis in typical radar systems is limited by the chirp period, restricting the maximum unambiguous radial velocity that can be discerned, leading to challenges in accurately determining target velocities without aliasing.
Innovation Solution
The system employs a method that includes transmitter and receiver arrays with phase control elements and signal processors to transmit and analyze frequency shift keyed or frequency-modified continuous wave signals, enabling the creation of virtual Doppler and aperture enhancements by adjusting chirp patterns, idle times, and phase variance to increase the maximum unambiguous radial velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional chirp patterns are used in radar systems, then the system structure remains simple, but the maximum unambiguous radial velocity is limited and aliasing occurs
Solution Approach 1:
The patent implements dynamic chirp patterns where the chirp rate and idle times are varied between different transmit elements rather than using static, uniform patterns. This dynamic approach allows the system to achieve virtual Doppler enhancement and increased maximum unambiguous radial velocity while managing the complexity through structured variation rather than complete randomness.
Solution Approach 2:
The patent introduces a temporal dimension to the chirp patterns by implementing different idle times between chirps for different transmit elements. This temporal differentiation, combined with frequency modulation, creates a multi-dimensional signal structure that enables virtual aperture enhancement and improved velocity measurement beyond the limitations of traditional single-dimension chirp patterns.
2Measurement precision
If the chirp period is reduced to increase maximum unambiguous radial velocity, then velocity measurement capability improves, but the time available for signal processing decreases
Solution Approach 1:
The patent segments the radar transmit function across multiple independent transmit elements, each capable of generating chirps with different idle times. This segmentation allows the system to process signals from different elements with different timing characteristics, effectively increasing the overall processing capability and compensating for the reduced time available per individual chirp cycle.
Solution Approach 2:
The patent maintains continuous radar operation by implementing overlapping chirp sequences from multiple transmit elements. While individual chirps may have reduced processing time, the continuous transmission and reception across multiple elements ensures that useful signal processing action is ongoing without interruption, effectively utilizing all available time for measurement.
3Measurement precision
If virtual aperture enhancement is implemented to improve detection capability, then target position and velocity accuracy improves, but the system complexity increases
Solution Approach 1:
The patent creates virtual copies of the physical aperture by implementing synthetic transmit and receive elements through signal processing. These virtual elements are generated by combining signals from physical elements with different idle times and frequency modulations, effectively creating additional aperture samples without adding physical hardware, thus improving detection accuracy while limiting complexity growth to software processing.
4Measurement precision
If different idle times are assigned to different transmit elements, then virtual Doppler enhancement is achieved, but the control system complexity increases
Solution Approach 1:
The patent systematically varies the idle time parameter across different transmit elements according to a predetermined pattern or sequence. This parameter change approach allows the system to achieve virtual Doppler enhancement by creating measurable phase differences in the returned signals, while the structured nature of the parameter variation keeps the control system complexity manageable through algorithmic generation rather than manual configuration.
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 allows for higher unambiguous radial velocity detection and improved radar detection capabilities by decoupling the limitations of traditional chirp patterns, enhancing the system's ability to accurately determine target velocities and positions.
Implementation Method 1
Doppler-based analysis in typical radar systems is often limited by the chirp period
Implementation Method 2
transmitter and receiver arrays with phase control elements to transmit and analyze frequency shift keyed or frequency-modified continuous wave signals
Data Source
AI summary
A system for virtual Doppler and/or aperture enhancement, preferably including one or more transmitter arrays, receiver arrays, and/or signal processors, and optionally including one or more velocity sensing modules. A method for virtual Doppler and/or aperture enhancement, preferably including transmitting a set of probe signals, receiving a set of reflected probe signals, and/or analyzing the set of received probe signals.