Target Detection System Mode Switching for Velocity Resolution
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Solution Overview
Problem
Existing automotive radar systems face challenges in designing circuits and increasing system costs due to broadband RF and BB signals when detecting multiple targets with the same velocity, and methods to address these issues often result in reduced spectral efficiency and increased interference.
Innovation Solution
A target information detection system that switches from a Doppler mode to a communication mode when the relative velocity between the measurement-side moving body and the target is equal to or less than a mode switching velocity, using the measurement-side and target-side velocity detection devices to calculate target information using the moving body and target velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If broadband RF signal is used to improve detection resolution, then detection resolution is improved, but circuit design complexity and system cost increase
Solution Approach 1:
The patent applies dynamics by making the radar signal bandwidth adjustable rather than fixed. The control unit dynamically changes the bandwidth of the RF signal based on detection requirements, allowing the system to use narrow bandwidth for cost-effective designs when high resolution isn't critical, and expand to broadband when detection resolution becomes the priority. This resolves the contradiction by making bandwidth a variable parameter rather than a fixed design constraint.
Solution Approach 2:
The patent directly applies parameter changes by modifying the bandwidth parameter of the RF signal. The control unit adjusts the bandwidth parameter dynamically, enabling the system to transition between narrow-band and broadband operation. This allows optimization of both detection resolution and circuit complexity by selecting appropriate bandwidth values based on operational requirements rather than being constrained to fixed broadband designs.
2Measurement precision
If broadband RF signal is used to improve detection resolution, then detection resolution is improved, but system cost increases
Solution Approach 1:
The system dynamically adjusts RF signal bandwidth based on actual detection needs rather than operating continuously at broadband. This dynamic adaptation allows the system to achieve required detection resolution only when necessary, reducing overall system cost by avoiding the permanent infrastructure and component requirements of fixed broadband systems while maintaining the capability to improve detection resolution when conditions warrant it.
Solution Approach 2:
By changing the bandwidth parameter dynamically, the system avoids the high cost associated with fixed broadband hardware designs. The control unit adjusts the bandwidth parameter to match detection requirements, enabling cost-effective narrow-band operation for routine scenarios while allowing resolution improvement through bandwidth expansion only when detection challenges arise, thus optimizing the cost-resolution tradeoff.
3Ease of manufacture
If narrow bandwidth RF signal is used to reduce cost, then system cost is reduced, but detection resolution deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing dynamic bandwidth adjustment. The system operates with narrow bandwidth to maintain cost-effectiveness during normal operation, but the control unit can expand the bandwidth when detection resolution becomes insufficient. This dynamic capability ensures the system maintains acceptable performance at lower cost while having the resolution improvement option available when needed.
Solution Approach 2:
The control unit changes the bandwidth parameter from a fixed narrow value to a variable that can be adjusted based on detection performance requirements. This parameter change allows the system to start with cost-effective narrow-band operation and improve detection resolution by increasing bandwidth only when the detection task demands higher precision, thus resolving the cost-resolution tradeoff dynamically.
4Device complexity
If multi-frequency CW method is used to suppress bandwidth, then RF signal bandwidth is reduced, but ability to detect multiple targets with same velocity deteriorates
Solution Approach 1:
The patent applies dynamics by making the radar operational mode adjustable. The control unit dynamically switches between narrow-band CW mode (for cost-effective operation) and broadband pulse compression mode (for superior target detection capability). This dynamic mode switching allows the system to suppress RF signal bandwidth during normal operation while maintaining the ability to detect multiple targets with the same velocity when required by changing to the appropriate operational mode.
Solution Approach 2:
The radar system achieves multi-functionality by incorporating both narrow-band CW operation and broadband pulse compression capabilities within a single system. The control unit selects the appropriate operational mode based on detection requirements, making the system universal enough to handle both cost-sensitive applications and complex multi-target detection scenarios, thus resolving the contradiction between bandwidth suppression and target detection capability.
5Measurement precision
If pulse compression method is used to improve detection resolution, then detection resolution is improved, but RF signal bandwidth increases
Solution Approach 1:
The patent applies dynamics by making the operational mode and bandwidth adjustable. Rather than being fixed in broadband pulse compression mode, the control unit dynamically selects between narrow-band CW mode and broadband pulse compression mode based on detection requirements. This allows the system to achieve improved detection resolution through pulse compression only when necessary, while spending most operational time in cost-effective narrow-band mode, thus resolving the contradiction between detection resolution and RF signal bandwidth.
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
Enables the separation and detection of multiple targets with the same velocity using inexpensive narrow-band RF and BB signals, reducing circuit design complexity and system costs while maintaining spectral efficiency and avoiding interference.
Implementation Method 1
The presence of the target, the distance (target distance) to the target, and the relative velocity of the target are measured by analyzing a received signal of the received wave (reflected wave)
Data Source
AI summary
The target information detection system according to the present invention includes a measurement-side speed detection device for detecting the speed of a measurement-side moving body as a moving body speed, and a target-side speed detection device for detecting the speed of a target as a target speed, and when it is determined from a Doppler frequency that the relative speed of the measurement-side moving body and the target is equal to or less than a mode switching speed set in advance, a target information detection device switches a target information detection mode from a Doppler mode to a communication mode, acquires a moving-body speed via the measurement-side speed detection device and acquires a target speed via the target-side speed detection device, and calculates target information using the moving-body speed and the target speed.