FMCW Radar Sensor Chirp Delay Stabilization
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Solution Overview
Problem
FMCW radar sensors experience decreased resolution and increased noise levels when measuring distance and velocity of targets, particularly as the distance increases, due to variations in beat frequency measurements.
Innovation Solution
A radar sensor system that adjusts the delay of the chirp signal based on the interest detection range, using a signal generator to emit and delay the chirp signal, and a frequency mixer to calculate the beat frequency, with a low-pass filter to filter out high-frequency components, allowing for stabilization of resolution and noise levels across varying distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FMCW radar continuously emits chirp pulse signals to measure distance and velocity, then the radar can obtain beat frequency information, but resolution decreases and noise level increases as target distance increases
Solution Approach 1:
The patent applies preliminary action by introducing a waiting loop that delays the chirp signal by a predetermined delay time before mixing it with the received signal. This pre-delay compensation counteracts the time delay caused by the target's distance, ensuring that the beat frequency calculation remains accurate regardless of whether the target is near or far. The waiting loop processes the signal in advance to maintain consistent measurement quality across different distances.
2Adaptability or versatility
If the radar detects targets at long distances, then the detection range increases, but the beat frequency measurement becomes less accurate
Solution Approach 1:
The patent implements dynamics by making the delay time adjustable based on the detection range mode. The controller dynamically sets the waiting loop's delay time according to whether the system is operating in short-range, middle-range, or long-range mode. This dynamic adjustment ensures that the beat frequency measurement remains accurate across different detection ranges, allowing the radar to adapt to various operational requirements.
3Device complexity
If the radar uses fixed delay time for all detection ranges, then the system is simpler to control, but resolution and noise level cannot be stabilized across varying distances
Solution Approach 1:
The patent applies dynamics by implementing a controller that adjusts the delay time based on the detection range mode. Rather than using a fixed delay time, the system dynamically switches between different delay time values corresponding to short-range, middle-range, and long-range modes. This dynamic adjustment stabilizes resolution and noise level across varying distances while maintaining manageable control complexity through mode-based organization.
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 solution effectively stabilizes resolution and noise levels in target detection regardless of distance by adjusting the delay time and pulse repetition interval, improving signal-to-noise ratio and reducing trash frequencies, thereby enhancing measurement accuracy.
Implementation Method 1
a frequency mixer configured to receive, as a received chirp signal, the chirp signal reflected from the target through a receiving antenna and to mix the reference signal and the received chirp signal with each other, thereby calculating a beat frequency
Data Source
AI summary
A radar sensor is disclosed. The radar sensor includes a signal generator configured to emit a chirp signal to a target through a transmitting antenna, a waiting loop configured to delay the chirp signal by a predetermined delay time, thereby generating a reference signal, and a frequency mixer configured to receive, as a received chirp signal, the chirp signal reflected from the target through a receiving antenna and to mix the reference signal and the received chirp signal with each other, thereby calculating a beat frequency.