Radar Chirp Scheduling for Accurate DOA and Range-Doppler Mapping
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Solution Overview
Problem
Existing radar systems face challenges in efficiently determining the direction of arrival (DOA) and range-Doppler mapping of targets using chirp signals, particularly in complex environments, which affects the accuracy of advanced driver assistance systems (ADAS) like adaptive cruise control and emergency braking.
Innovation Solution
A radar sensor system that transmits chirp signals through multiple antennas using a combination of single input multiple output (SIMO) and multiple input multiple output (MIMO) techniques, along with varying carrier frequencies, to enhance DOA and range-Doppler mapping, allowing for precise target detection and vehicle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chirp signals are transmitted through multiple antennas using MIMO techniques, then DOA determination accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the chirp signal transmission into two distinct groups: some chirp signals are transmitted through a single antenna while other chirp signals are transmitted through multiple antennas using MIMO techniques. This segmentation allows the system to obtain sufficient data for DOA determination without requiring all signals to use complex MIMO transmission, thereby reducing overall system complexity while maintaining measurement precision.
Solution Approach 2:
The patent applies partial MIMO action by using multiple antennas for only some chirp signals rather than all signals. This partial application of MIMO provides enough information for accurate DOA determination without the full complexity of MIMO for every transmission, achieving a balance between measurement precision and device complexity.
2Measurement precision
If carrier frequency is varied for different chirp signals, then range-Doppler mapping accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent changes the carrier frequency parameter for different groups of chirp signals. By varying the carrier frequency, the system can distinguish between range and Doppler effects more accurately in the range-Doppler map. The processing complexity is managed by systematically assigning different frequencies to different signal groups and using corresponding frequency-based processing techniques.
3Device complexity
If all chirp signals are transmitted through single antenna, then device complexity is reduced, but DOA determination accuracy deteriorates
Solution Approach 1:
The patent segments the chirp signal transmission into two distinct groups: some chirp signals are transmitted through a single antenna while other chirp signals are transmitted through multiple antennas using MIMO techniques. This segmentation allows the system to obtain sufficient data for DOA determination without requiring all signals to use complex MIMO transmission, thereby reducing overall system complexity while maintaining measurement precision.
4Measurement precision
If MIMO is applied to all chirp signals, then resolving power is improved, but processing time increases
Solution Approach 1:
The patent applies partial MIMO action by using multiple antennas for only some chirp signals rather than all signals. This partial application of MIMO provides enough information for accurate DOA determination and range-Doppler mapping without the full processing burden of MIMO for every transmission, achieving a balance between resolving power and processing time.
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 the accuracy of target detection and vehicle control by enhancing resolving power, enabling precise range, Doppler velocity, and angle determination, thereby improving ADAS functions such as adaptive cruise control and emergency braking.
Implementation Method 1
a radar sensor configured to radiate a radar signal and receive a reflected signal of the radiated radar signal
Implementation Method 2
determine a direction of arrival (DOA) of the target from radar data determined based on the at least some chirp signals, the other chirp signals, and the reflected signal
Data Source
AI summary
An electronic device includes: a radar sensor configured to radiate a radar signal and receive a reflected signal of the radiated radar signal by: transmitting at least some chirp signals among a plurality of chirp signals belonging to the same frame through a single antenna among a plurality of antennas of the radar sensor; and transmitting other chirp signals among the plurality of chirp signals belonging to the same frame through at least two antennas among the plurality of antennas; and one or more processors configured to detect a target and determine a direction of arrival (DOA) of the target from radar data determined based on the at least some chirp signals, the other chirp signals, and the reflected signal.