Millimeter-Wave Radar Bandwidth Expansion via Multi-Frequency Sweep
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Solution Overview
Problem
Millimeter-wave radar systems face limitations in bandwidth usage due to regulatory constraints, necessitating an efficient method to utilize limited bandwidth resources for effective operation.
Innovation Solution
The method involves transmitting two radar signals on different frequency bands, with the radar signal processing apparatus receiving reflected signals to obtain range, velocity, and angle information, thereby expanding the frequency sweep bandwidth and improving range resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar uses limited bandwidth resources due to regulatory constraints, then radar can operate legally, but range resolution deteriorates
Solution Approach 1:
The patent transitions from single-frequency band operation to multi-frequency band operation, utilizing different frequency dimensions (first frequency band and second frequency band) to simultaneously achieve regulatory compliance and improved range resolution. By operating in multiple frequency dimensions, the radar system expands its effective bandwidth without violating regulatory constraints on individual frequency bands.
Solution Approach 2:
The patent divides the radar operation into segmented frequency band usage, transmitting signals on a first frequency band and a second frequency band separately. This segmentation allows the system to comply with regulatory bandwidth limits on each individual band while achieving cumulative bandwidth expansion through coordinated processing of reflections from both bands.
2Device complexity
If radar transmits on single frequency band, then device complexity is low, but frequency sweep bandwidth is limited
Solution Approach 1:
The radar system maintains a universal signal transmission architecture that can operate on multiple frequency bands using the same hardware components. The transmitting unit and receiving unit are designed to handle both first frequency band and second frequency band operations, enabling bandwidth expansion without proportionally increasing device complexity through dedicated separate systems for each band.
3Quantity of substance
If radar uses consecutive frequency domain resources, then frequency sweep bandwidth is limited, but signal processing is simpler
Solution Approach 1:
The patent employs non-consecutive frequency domain resources by utilizing distinct first and second frequency bands separated by frequency gaps. This approach expands the overall frequency sweep bandwidth by jumping between frequency dimensions rather than using contiguous bands, while the signal processing complexity is managed through coordinated processing of reflections from these separated frequency regions.
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 approach allows for enhanced range resolution and reduced time for measuring target information, while maintaining radar resolution, by utilizing non-overlapping frequency domain resources.
Implementation Method 1
receiving a first reflected signal and a second reflected signal, where the first reflected signal is an electromagnetic wave obtained after the first radar signal is reflected by a target object, and the second reflected signal is an electromagnetic wave obtained after the second radar signal is reflected by the target object
Data Source
AI summary
This application provides a radar signal processing method and apparatus, which are applicable to the waveform design of a millimeter-wave radar. The radar signal processing method is applicable to an apparatus, for example, a millimeter-wave radar or a chip system inside the millimeter-wave radar, and the method includes: transmitting a first radar signal on a first frequency band; transmitting a second radar signal on a second frequency band; receiving a first reflected signal and a second reflected signal, where the first reflected signal is an electromagnetic wave reflected by a target object in response to the first radar signal, and the second reflected signal is an electromagnetic wave reflected by the target object in response to the second radar signal; and obtaining at least one of range information, velocity information, and angle information of the target object.