Radar System Frequency Modulation Pattern Control
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Solution Overview
Problem
Existing radar systems face interference issues when multiple radars are installed on a vehicle, leading to delayed obstacle detection due to simultaneous radio wave transmission, as they often rely on time-sharing techniques that elongate detection intervals.
Innovation Solution
A radar system with a controller that manages the frequency modulation patterns of multiple radars to ensure their electromagnetic waves never have continuous overlap, using different frequency modulation patterns and alternating between CW and FM-CW modes to prevent interference while maintaining effective obstacle detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If time-sharing technique is used to prevent radio wave interference between multiple radars, then radio wave interference is prevented, but detection time interval is elongated and obstacle detection is delayed
Solution Approach 1:
The patent applies parameter changes by differentiating the frequency modulation patterns of multiple radars. Specifically, radars transmit electromagnetic waves with different frequency modulation characteristics (e.g., different frequency sweep rates or patterns), so that even when transmitting simultaneously, their frequency spectra do not continuously overlap. This resolves the interference problem without requiring time-sharing, thus maintaining continuous detection capability.
2Productivity
If multiple radars transmit electromagnetic waves simultaneously, then obstacle detection coverage is improved, but radio wave interference occurs between radars
Solution Approach 1:
The patent applies local quality by assigning different frequency modulation characteristics to different radars. Each radar operates with a unique frequency modulation pattern localized to its transmission spectrum, allowing simultaneous operation without mutual interference. This enables multiple radars to cover different spatial areas simultaneously while maintaining frequency separation to avoid interference.
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 solution effectively minimizes radio wave interference between multiple radars, allowing for continuous and accurate detection of obstacles without elongating detection intervals, even in overlapping detection ranges.
Implementation Method 1
a first radar that transmits an electromagnetic wave in accordance with one or more frequency modulation patterns
Implementation Method 2
an FM-CW mode of a frequency modulation pattern in which the frequency is increased or decreased along a triangular wave
Data Source
AI summary
A radar system includes radars and a controller. The controller controls waveform patterns of the radars. As a signal processing unit of each of the radars receives an instruction from the controller, the signal processing unit selects a frequency modulation pattern of a VCO between an FM-CW mode and a CW mode stored in a waveform memory to perform mode switching, and then outputs a radio wave from a transmission antenna. Then, the controller instructs each signal processing unit for a frequency modulation pattern of each radar or an output timing of each pattern so that a time, at which continuous wave signals output from the radars have the same frequency, is not continuous.