Radar Phase Noise Detection via Frequency-Modulated Signal Sequences
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Solution Overview
Problem
Radar systems face reduced detection accuracy and ambiguity in determining object distances and speeds due to strong phase noise, especially when covered by absorptive radomes or detecting weak targets, which can lead to sensor blindness and unreliable detection regions.
Innovation Solution
The method employs frequency-modulated signal sequences with ramps and time offsets to generate two-dimensional spectra, comparing measured phase differences to precalculated models, using criteria like signal-to-noise ratio and detection quality to identify and mitigate phase noise, thereby enhancing detection accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar systems use absorptive radome coverings to protect sensors, then sensor protection and environmental resistance are improved, but phase noise increases and detection accuracy deteriorates
Solution Approach 1:
The system performs preliminary identification of phase noise affected regions by comparing measured phase differences against precalculated models before final object detection. This allows the radar to detect and mark unreliable spectral ranges in advance, preventing phase noise from degrading the overall detection accuracy while maintaining the protective radome covering.
2Productivity
If radar systems detect weak targets, then detection capability is improved, but phase noise becomes stronger and measurement accuracy deteriorates
Solution Approach 1:
The system uses feedback by continuously monitoring phase differences in the frequency-modulated signal sequences and comparing them against precalculated models. When phase noise is detected in specific spectral ranges, the system adjusts by marking these regions as unreliable and excluding them from final detection results, thereby maintaining measurement accuracy while preserving the ability to detect weak targets.
3Productivity
If radar systems use frequency-modulated signal sequences with multiple ramps, then detection capability is improved, but system complexity increases
Solution Approach 1:
The system segments the frequency-modulated signal into multiple ramp sequences with different time offsets and compares phase differences across these segments. By dividing the detection process into separate ramp comparisons and using precalculated models for each segment, the system improves detection capability through multiple measurements while managing complexity through modular signal processing.
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 detects strong phase noise, improves measurement accuracy, and provides reliable detection even in regions affected by absorptive radome coverings or weak targets, enabling better performance in driver assistance functions by marking unreliable spectral ranges.
Implementation Method 1
emitting electromagnetic radiation and receiving partial radiation reflected by objects
Implementation Method 2
a device is provided for emitting a frequency-modulated signal which has at least two signal sequences that have ramps
Implementation Method 3
an apparatus having a mixer for mixing the frequency-modulated transmit signal with the signal received by the at least one antenna
Data Source
AI summary
An apparatus for emitting electromagnetic radiation and receiving partial radiation reflected by objects, and determines the instantaneous performance of its system detection. The apparatus includes a device for emitting a frequency-modulated transmit signal that has at least two signal sequences which have ramps, each succeeding one another in the frequency characteristic, with gaps in between, the signal sequences being interleaved with each other with a predetermined time offset so that in each case a first ramp of each of the signal sequences is output before a second ramp of one of the at least two signal sequences is output. The apparatus includes a mixer, an analog-to-digital converter, a transform device, and a device for detecting phase noise. The phase changes of the receive signals are compared over all two-dimensional spectra to a precalculated model, and the cause of the phase noise is ascertained with the aid of predetermined criteria.