Radar Segmented Chirp Phase Compensation
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Solution Overview
Problem
Radar systems using segmented chirp signals face phase errors due to time gaps between chirp segments, especially in environments with moving objects, leading to decreased performance and increased computational and memory requirements.
Innovation Solution
The radar system transmits a set of chirps with each chirp consisting of a first and second chirp segment having different frequency ranges, with the second segment transmitted after a specific time. The system samples received signals, performs column-wise Doppler Fourier transforms, applies phase compensation, and combines data to obtain range and velocity information without significant increases in computations or memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If segmented chirp signals are used to achieve wide bandwidth, then range resolution is improved, but phase errors occur due to time gaps between segments
Solution Approach 1:
The chirp signal is divided into multiple segments with different frequency ranges (e.g., first segment: 77-81 GHz, second segment: 81-85 GHz). Each segment is transmitted separately with a time gap, allowing the system to achieve wide total bandwidth while managing phase errors through subsequent compensation techniques
Solution Approach 2:
The patent applies phase compensation by adjusting the phase parameter of the received signals from different segments. By calculating and applying appropriate phase correction values, the system compensates for phase errors introduced by time gaps, enabling coherent integration of signals from all segments
2Measurement precision
If segmented chirp signals are transmitted, then bandwidth is increased, but computational complexity increases
Solution Approach 1:
The patent performs preliminary phase compensation on the received signals from different chirp segments before combining them. By pre-correcting the phase errors in the time domain, the system avoids more complex post-processing operations, reducing overall computational complexity while maintaining signal integrity
Solution Approach 2:
The patent combines the processed signals from multiple chirp segments after phase compensation. By merging the compensated data sets, the system achieves the benefits of wide bandwidth while managing computational load through efficient combination operations rather than separate processing of each segment
3Measurement precision
If segmented chirp signals are used, then frequency range is expanded, but memory requirements increase
Solution Approach 1:
The patent performs preliminary processing and phase compensation on each chirp segment before storage or further processing. By preparing the data in advance and correcting phase errors early in the pipeline, the system reduces the memory burden that would otherwise be required to store and manage raw data from multiple wideband segments
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 effectively compensates for phase differences due to time gaps, improving the radar system's accuracy and sensitivity while maintaining efficient processing requirements.
Implementation Method 1
Many driving assistance systems implement frequency modulated continuous wave (FMCW) radar systems to aid in collision warning, blind spot warning, lane change assistance, parking assistance, and rear collision warning.
Implementation Method 2
The reflected signal is down-converted, digitized and then processed to obtain the range, velocity, and angle of arrival for objects in front of the radar system.
Implementation Method 3
apply phase compensation to one of the first and second sets of velocity data to obtain a phase-corrected set of velocity data
Data Source
AI summary
Radar systems, devices, methods, and non-transitory mediums storing instructions for causing execution of radar signal processing operations are provided. Multiple chirps are transmitted, in which each chirp includes a first chirp segment having a first bandwidth spanning a first frequency range and a second chirp segment having a second bandwidth spanning a second, different, frequency range. For each chirp, the second chirp segment is transmitted a specific time after the first chirp segment. The chirps are sampled to generate first and second sets of sampled data corresponding to the first chirp segments and second chirp segments, respectively. After processing the sets of sampled data individually to obtain first and second frequency representations, respectively, phase compensation is applied to the second frequency representation, the result of which is then combined with the first frequency representation to obtain a set of aggregate data, on which a transform is performed to generate range and velocity data.