FMCW Radar Nonlinear Sweep Decoupling Distance Velocity
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Solution Overview
Problem
FMCW radar systems face challenges in decoupling and separating distance and velocity information, leading to reduced detection probability and increased system complexity due to dependencies on target characteristics and the need for additional modulation and filtering modules.
Innovation Solution
A detection method using a nonlinear frequency sweep modulation signal that allows for independent perception of target distance and velocity information, enabling decoupling and separation within a single frequency sweep cycle without time division multiplexing or double sideband modulation, utilizing pre-stored beat frequency signals for matching and determining target parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-frequency sweep modulation or double sideband modulation is used to separate distance and velocity information, then distance and velocity information can be separated, but detection probability decreases and system complexity increases
Solution Approach 1:
The patent changes the frequency modulation parameter from linear to nonlinear (specifically quadratic) frequency sweep. This parameter change allows the beat frequency signal to contain independent distance and velocity information without requiring multiple frequency sweeps or complex modulation schemes, thereby maintaining detection probability while achieving information separation.
Solution Approach 2:
The patent pre-stores multiple beat frequency signals corresponding to different distances and velocities. During detection, the actual beat frequency signal is matched against these pre-stored signals to directly determine target parameters, eliminating the need for complex real-time processing and additional modulation modules.
2Measurement precision
If multi-frequency sweep modulation is used to decouple target information, then distance and velocity can be separated, but the system requires time division multiplexing which increases system complexity
Solution Approach 1:
By changing from linear to nonlinear frequency sweep, the patent enables single-cycle decoupling of distance and velocity information. The nonlinear frequency progression creates unique beat frequency characteristics that encode both target parameters independently within a single modulation cycle, eliminating the need for time division multiplexing and reducing system complexity.
Solution Approach 2:
The patent uses pre-stored beat frequency signals as reference copies for comparison with actual detected signals. This copying approach simplifies the detection process by replacing complex real-time calculations with straightforward signal matching, reducing computational complexity while maintaining accurate target parameter extraction.
3Measurement precision
If double sideband modulation with intensity modulator and phase modulator is used, then distance and velocity information can be obtained, but additional filtering and amplifying modules are required which increases cost and complexity
Solution Approach 1:
The patent replaces the complex double sideband modulation system (requiring both intensity and phase modulators) with a simpler nonlinear frequency sweep approach. By using quadratic frequency modulation, the system directly generates beat frequency signals containing both distance and velocity information, eliminating the need for multiple modulators, filters, and amplifiers, thereby reducing system cost and complexity.
Solution Approach 2:
The patent extracts and utilizes only the essential frequency modulation function needed for target detection, removing unnecessary modulation components (intensity modulator, phase modulator, filters, amplifiers). The nonlinear frequency sweep directly produces the required beat frequency signals, simplifying the system architecture while maintaining the ability to extract distance and velocity information.
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 maintains detection probability and achieves high sensitivity by decoupling distance and velocity information within a single cycle, reducing system complexity and cost by eliminating the need for additional modulation modules.
Implementation Method 1
A frequency modulated continuous wave (FMCW) radar is a continuous wave radar whose transmitting frequency is modulated by a specific signal. FMCW radar obtains distance information of a target by comparing a difference between a frequency of an echo signal at any moment and a frequency of an emitting signal at the moment
Implementation Method 2
A radial velocity and distance of the target may be obtained by processing the measured frequency difference between the two
Data Source
AI summary
A detection method using a frequency modulated continuous wave, a radar, and a computer-readable storage medium. The method includes: emitting a detection wave to detect a target object, where the detection wave is a nonlinear frequency sweep modulated signal; receiving an echo of the detection wave reflected by the target object; obtaining an actual beat frequency signal according to the echo and the detection wave; and obtaining a distance and/or velocity of the target object according to the actual beat frequency signal. By the method, the decoupling and separation of distance/velocity information may be completed in a single cycle. The decoupling and separation of a distance/velocity can be completed within a single frequency sweep cycle, and a detection probability of a system is kept from deteriorating.