Radar Antenna Channel Layout for Angular Resolution Without Grating Lobes
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Solution Overview
Problem
Current vehicle radar systems face challenges in improving angular resolution while maintaining cost-effectiveness, as increasing channel spacing in MIMO antennas leads to grating lobes and increased complexity, and planar arrangement of reception channels is costly and complicated.
Innovation Solution
The antenna device features a transmitting antenna with specific channel configurations, including wider and narrower intervals between elements, and a receiving antenna with strategically arranged reception channels to enhance angular resolution without increasing cost, allowing for both high-resolution and wide-angle modes using shared components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the channel spacing of the receiving antenna is increased to increase the antenna aperture and decrease the beamwidth, then the angular resolution is improved, but grating lobes appear during beam scanning which causes difficulty in identifying the angle of the target
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of receiving channels to a three-dimensional configuration by introducing multiple transmitting antennas at different heights and positions. This spatial dimensionality change allows the system to achieve high angular resolution without the grating lobe problems that plague two-dimensional wide-spaced arrays.
Solution Approach 2:
The patent implements dynamic beam scanning capability where the beam direction can be changed by controlling the phase and amplitude of signals from multiple transmitting antennas. This dynamic control allows the system to scan through different angles and identify target positions accurately even with non-uniform channel spacing.
2Measurement precision
If the receiving channels are arranged in a planar manner to measure both horizontal and vertical angles, then the angular measurement capability is improved, but the cost and device complexity increase significantly
Solution Approach 1:
The patent makes the receiving antenna serve multiple functions: it can measure both horizontal and vertical angles, it can operate in both MIMO mode for high resolution and phased array mode for wide scanning, and it can share the same physical hardware for different measurement modes. This multi-functionality eliminates the need for separate planar arrays for different measurement purposes.
Solution Approach 2:
The patent combines the MIMO radar functionality with phased array radar capabilities in a single receiving antenna system. By merging these two approaches, the system achieves both high angular resolution through MIMO and wide-angle scanning through phased array techniques, while using shared hardware components to reduce complexity.
3Measurement precision
If the antenna aperture is increased to decrease the beamwidth and improve angular resolution, then the measurement precision is improved, but the device size and cost increase
Solution Approach 1:
The patent creates virtual antenna elements through signal processing that replicate the functionality of additional physical antennas. By using MIMO techniques with multiple transmitting antennas and processing their combined signals, the system achieves the effect of a larger antenna aperture without physically building a proportionally larger receiving array.
Solution Approach 2:
The patent changes the spatial parameters of the transmitting antennas (positions at different heights and locations) to effectively increase the antenna aperture. This parameter change in the transmitting side configuration allows the receiving antenna to achieve high angular resolution without needing to be physically large.
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 configuration improves angular resolution while preventing cost increases, enabling effective target identification with reduced grating lobes and simplified device complexity, allowing for both high-resolution and wide-angle observations.
Implementation Method 1
The transmitting antenna radiates radio waves
Implementation Method 2
The receiving antenna receives a reflected wave of the radio waves radiated from the transmitting antenna and reflected by the target
Data Source
AI summary
An antenna device includes a transmitting antenna including a transmission channel, a transmitting antenna including a transmission channel, a transmitting antenna including a transmission channel, a transmitting antenna including a transmission channel, and a receiving antenna including reception channels. An interval between the transmitting antenna and the transmitting antenna is wider than an overall width of the receiving antenna. An interval between the transmitting antenna and the transmitting antenna is narrower than an interval between adjacent channels among the reception channels.