Radar Apparatus Uneven Doppler Shift Multiplexing
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Solution Overview
Problem
Existing radar apparatuses, particularly MIMO radars, face challenges in achieving comprehensive sensing accuracy for target objects, especially in wide-angle sensing scenarios.
Innovation Solution
The proposed radar apparatus employs a plurality of transmission antennas with different directional characteristics to form multiple beams, and applies multiplexing transmission using a combination of time-division and Doppler multiplexing techniques. Specifically, the system applies phase rotations corresponding to assigned Doppler shift amounts to each transmission antenna, resulting in uneven Doppler shift intervals on the Doppler frequency axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If Doppler multiplexing transmission is used with multiple transmission antennas, then the sensing range and coverage are improved, but the sensing accuracy deteriorates due to difficulty in separating Doppler multiplexed signals
Solution Approach 1:
The patent segments the Doppler frequency axis into multiple regions and assigns different Doppler shift amounts to different transmission antennas. This segmentation allows the receiver to separate signals from different antennas by filtering specific Doppler frequency regions, thereby maintaining sensing accuracy while expanding sensing range through multiplexed transmission
Solution Approach 2:
The patent applies partial action by selectively assigning Doppler shift amounts only to specific transmission antennas rather than all antennas, or applying different levels of Doppler shift patterns. This allows the system to maintain accurate signal separation for assigned antennas while still utilizing multiple antennas for expanded coverage
2Ease of operation
If uniform Doppler shift intervals are assigned to all transmission antennas, then the signal separation is simplified, but the sensing accuracy deteriorates in wide-angle scenarios with varying reception power levels
Solution Approach 1:
The patent introduces asymmetry by assigning different Doppler shift amount patterns to different transmission antennas. Some antennas are assigned with Doppler shifts while others are not, or different antennas have different shift patterns. This asymmetric assignment improves sensing accuracy in wide-angle scenarios by accounting for varying reception power levels across different beam directions
Solution Approach 2:
The patent applies local quality by tailoring the Doppler shift assignment to specific transmission antennas based on their individual characteristics and beam directions. Each antenna receives a customized Doppler shift pattern appropriate for its local sensing conditions, improving overall sensing accuracy while maintaining manageable signal separation
3Quantity of substance
If Doppler shift amounts are assigned to all transmission antennas, then the multiplexing capacity is maximized, but the system complexity increases due to coordination requirements
Solution Approach 1:
The patent applies partial action by assigning Doppler shift amounts to only some transmission antennas rather than all antennas. This reduces the coordination complexity and computational burden while still achieving effective multiplexing capacity through the subset of assigned antennas
Solution Approach 2:
The patent segments the set of transmission antennas into groups: those assigned with Doppler shift amounts and those without. This segmentation allows the system to manage complexity by handling only the necessary subset of antennas for multiplexing while keeping the overall system architecture simple and manageable
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 enhances the sensing accuracy of the radar apparatus by allowing for improved separation and detection of Doppler multiplexed signals, even in scenarios with varying reception power levels across different beam directions.
Implementation Method 1
a phase rotation corresponding to a Doppler shift amount assigned to each of the plurality of transmission antennas has been applied
Data Source
AI summary
A radar apparatus includes: a plurality of transmission antennas including a first transmission antenna forming a first beam and a second transmission antenna forming a second beam different from the first beam; and transmission circuitry, which, in operation, performs multiplexing transmission of a transmission signal from the plurality of transmission antennas, the transmission signal being a signal to which a phase rotation corresponding to a Doppler shift amount assigned to each of the plurality of transmission antennas has been applied. In the radar apparatus, a Doppler shift interval by the plurality of transmission antennas is uneven on a Doppler frequency axis, and a first pattern of the Doppler shift amount assigned to the first transmission antenna is different from a second pattern of the Doppler shift amount assigned to the second transmission antenna.