Near-Field Radar Reflector Pitch Compensation for Vehicle Sensing
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Solution Overview
Problem
Existing radar systems for vehicles face design tradeoffs between performance and cost, with increased capabilities in one area often leading to decreased capabilities in others, and stringent size and packaging limitations complicating design optimizations.
Innovation Solution
A radar detector system with a radiation emitter and reflectors in the near field region, where the reflectors have a refractive index less than 1 and a thickness greater than the skin depth, allowing for phase-shift-free radiation reflection and dynamic orientation adjustment to compensate for vehicle pitch changes, using materials like gold, copper, or silver, and actuators for real-time control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the vertical field of view is increased to accommodate vehicle pitch changes, then the angular field coverage is improved, but the useful field decreases and radar design resources are underutilized
Solution Approach 1:
The patent employs a movable reflector assembly that can dynamically adjust its orientation angle relative to the emitter. This dynamic adjustment allows the system to adapt the vertical field of view to match actual vehicle pitch conditions, ensuring full utilization of the fixed angular field while maintaining effective coverage across varying operating conditions
Solution Approach 2:
The system changes the orientation parameter of the reflector assembly to optimize performance. By adjusting the reflector angle based on detected pitch conditions, the system maximizes the useful field within the fixed angular field boundaries, thereby improving resource utilization while maintaining adaptability
2Measurement precision
If the angular field and angular resolution are increased to improve detection performance, then the detection capability is improved, but the power and sensitivity requirements increase leading to higher expense
Solution Approach 1:
The patent segments the radar field of view control into two independent components: a fixed emitter providing the radiation source and a movable reflector assembly for field of view adjustment. This segmentation allows the emitter to operate at fixed, optimized power levels while the reflector handles angular resolution adjustments mechanically, avoiding the need to increase emitter power for improved resolution
Solution Approach 2:
The reflector assembly acts as an intermediary between the fixed emitter and the target environment. By positioning and orienting the reflector, the system achieves variable angular resolution and field coverage without requiring the emitter to increase its power output, thus improving measurement precision while maintaining constant power requirements
3Adaptability or versatility
If the detector is made more capable to handle various vehicle orientations, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The movable reflector assembly serves multiple functions: it adjusts the vertical field of view to accommodate pitch changes, maintains optimal beam orientation relative to the ground, and compensates for various vehicle orientations. This single multi-functional component achieves adaptability without proportionally increasing device complexity
Solution Approach 2:
The system incorporates pitch detection feedback to control the reflector assembly orientation. The pitch detector provides real-time information about vehicle orientation, and this feedback controls the actuator that positions the reflector, creating a closed-loop system that achieves adaptability through simple feedback control rather than complex mechanical structures
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
The system achieves efficient angular compensation without phase shift, maintaining performance while minimizing unused capabilities and accommodating various vehicle orientations, thus optimizing radar design within size and power constraints.
Implementation Method 1
A radiation steering device includes a plurality of reflectors... The plurality of reflectors are situated to reflect the radiation emitted by the radiation emitter
Implementation Method 2
the at least one characteristic of the plurality of reflectors comprises an index of refraction of a reflecting material of the reflectors and the index of refraction is less than 1
Implementation Method 3
The actuator is configured to adjust an orientation of the plurality of reflectors. The controller is configured to control the actuator to achieve the determined orientation
Data Source
Figure 1~2
Figure 3~4
AI summary
An illustrative example detector (20) for use on a vehicle (22) includes a radiation emitter (30) having a near field region that is defined at least in part by a wavelength of radiation emitted by the radiation emitter. A radiation steering device includes a plurality of reflectors (32), an actuator (40), and a controller (42). The reflectors (32) are situated to reflect the radiation emitted by the radiation emitter (30). The reflectors (32) are in the near field region and have at least one characteristic that limits any phase shift of the reflected radiation. The actuator (40)is configured to adjust an orientation of the reflectors (32). The controller (42) is configured to determine an orientation of the plurality of reflectors (32) relative to the radiation emitter (30) to steer the emitted radiation reflected from the reflectors (32) in a determined direction. The controller (42) is configured to control the actuator (42) to achieve the determined orientation.