Radar Null Position Control via Phase Shifting
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Solution Overview
Problem
Radar devices face challenges in efficiently detecting objects using antennas with simple structures while maintaining high gain, which is essential for applications like autonomous driving, as increasing antenna numbers increase technical requirements and costs.
Innovation Solution
A radar apparatus and control method utilizing a phased array antenna system with a first transmitting antenna and a second transmitting antenna, where the phase of the source signal is inverted and shifted, respectively, to create null positions in the radiation pattern, allowing for efficient object detection by controlling the nulls to appear in specific areas, excluding those detected by other sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of antennas is increased to increase gain and improve detection accuracy, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the phase parameters of transmission signals to create null positions in the radiation pattern. By adjusting phase shift values of the second transmission signal relative to the first transmission signal, the system creates directional nulls that improve detection accuracy without adding more antennas. This parameter-based approach resolves the contradiction by achieving improved measurement precision through signal processing rather than hardware expansion.
2Power
If the number of antennas is increased to increase gain, then gain is improved, but cost increases
Solution Approach 1:
The patent achieves improved antenna gain by changing the phase parameters of existing transmission signals rather than adding more antenna elements. By creating controlled null positions through phase shifting, the system concentrates energy in desired directions, effectively increasing gain without the cost of additional antennas. This resolves the contradiction by achieving power improvement through parameter optimization rather than hardware expansion.
3Measurement precision
If beam width is adjusted to improve detection accuracy, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent achieves beam width adjustment and detection accuracy improvement by changing phase parameters of transmission signals. By adjusting the phase shift values between first and second transmission signals, the system creates null positions at specific angles, effectively controlling beam characteristics without complex mechanical or electronic beamwidth adjustment mechanisms. This resolves the contradiction by achieving precise detection through simple phase parameter changes.
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 efficient object detection using a simple antenna structure by leveraging the null positions in the radiation pattern, reducing costs and improving detection accuracy without the need for complex beam width adjustments, while also ensuring non-overlap with areas detected by other sensors.
Implementation Method 1
a first modulator for generating a first transmission signal having an inverted phase of a source signal and transmitting the first transmission signal through the first transmitting antenna, and a second modulator for generating a second transmission signal having a shifted phase of the source signal and transmitting the second transmission signal through the second transmitting antenna
Implementation Method 2
receiving a reflection signal in which the first transmission signal and the second transmission signal are reflected from the object through the receiving antenna
Data Source
AI summary
The present disclosure provides a radar apparatus including: an antenna including a first transmitting antenna, a second transmitting antenna, and a receiving antenna; a transmitter including a first modulator for generating a first transmission signal having an inverted phase of a source signal and transmitting the first transmission signal through the first transmitting antenna, and a second modulator for generating a second transmission signal having a shifted phase of the source signal and transmitting the second transmission signal through the second transmitting antenna; a receiver for receiving a reflection signal of the first transmission signal and the second transmission signal reflected from the object through the receiving antenna; and a controller for obtaining information for the object based on the reflection signal. According to the present disclosure, it is possible to efficiently detect the object using the antenna having a simple structure.


