FMCW Radar Frequency Selection Through a Protective Cover
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Solution Overview
Problem
Existing radar systems face challenges in accurately detecting objects due to signal attenuation caused by the thickness of the outer case and installation distance, leading to deteriorated sensor performance.
Innovation Solution
An electronic device employing a frequency modulated continuous wave radar (FMCW radar) with a signal generator that generates chirp signals, a synthesizer to raise frequencies, and a phase controller for beamforming, along with a controller to manage operations, enhances object detection by minimizing signal loss through a radar cover made of materials like synthetic resin or rubber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the outer case is increased to protect the sensor, then the mechanical strength and protection are improved, but the signal attenuation increases and sensor performance deteriorates
Solution Approach 1:
The patent applies parameter changes by selecting specific material properties for the outer case. The outer case is made of synthetic resin with controlled thickness (0.5-2.0mm) and specific material composition to optimize the balance between mechanical protection and radio wave transmission. This parameter optimization reduces signal attenuation while maintaining adequate protection.
Solution Approach 2:
The patent uses composite material approach by combining synthetic resin with specific additives and fillers in the outer case. The composite material structure includes base resin, coupling agents, and other components in controlled ratios to achieve both mechanical strength and electromagnetic wave transmission properties.
2Reliability
If the installation distance between the sensor and the outer case is increased to reduce signal attenuation, then the sensor performance is improved, but the structural compactness and ease of installation are worsened
Solution Approach 1:
The patent optimizes the installation distance parameter to between 0.5-2.0mm from the inner surface of the outer case. This controlled parameter range achieves the best compromise between signal transmission quality and structural compactness, eliminating the need for complex adjustment mechanisms.
3Measurement precision
If multiple frequencies are tested to find the optimal operating frequency, then the detection accuracy is improved, but the time required for frequency selection and system initialization increases
Solution Approach 1:
The patent implements preliminary action by pre-storing multiple test frequencies in the frequency selection unit before operation. The system performs frequency measurement and selection in advance during initialization, so that the optimal frequency is already determined when detection begins, avoiding time-consuming frequency searches during actual operation.
Solution Approach 2:
The patent uses feedback mechanism where the reception level measurement unit continuously monitors signal strength at different frequencies, and the frequency selection unit adjusts the operating frequency based on this feedback to maintain optimal detection accuracy.
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 improves object detection accuracy and reliability by reducing signal attenuation, enabling precise distance, speed, and angle measurements of objects around a vehicle.
Implementation Method 1
transmitting a transmitted wave T having a frequency in a predetermined frequency band from a transmitting antenna 25
Implementation Method 2
receiving a reflected wave R obtained by reflection of the transmitted wave T by a predetermined object 200, from the receiving antenna 31
Implementation Method 3
determining a frequency at which an intensity of the received signal received as each of the reflected waves R is maximum, as the frequency of the transmitted wave T to be transmitted from the transmitting antenna 25
Data Source
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AI summary
An electronic device 1 comprises: a transmitting antenna configured to transmit transmitted waves; a receiving antenna configured to receive reflected waves obtained by reflection of the transmitted waves; and a controller. The controller detects, based on transmitted signals transmitted as the transmitted waves and received signals received as the reflected waves, an object reflecting the transmitted waves. The controller determines frequencies of transmitted waves to be transmitted from the transmitting antenna based on results of receiving, from the receiving antenna, each of reflected waves obtained by reflection of a plurality of transmitted waves with different frequencies transmitted from the transmitting antenna.