Radar Signal Reception Timing to Reject Window Reflections
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Solution Overview
Problem
Conventional radar systems in autonomous driving vehicles suffer from inaccurate detection results due to reflected signals from windows interfering with obstacle detection, leading to unclear road conditions and potential deviations in vehicle movement.
Innovation Solution
A radar system structure that includes a signal receiving circuit with a control circuit and converter, which delays the reception of reflected signals from windows by determining a preset duration based on signal transmission rates, ensuring the processor receives only obstacle-related signals, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar receiver receives reflected signals without time delay, then the detection range is extended, but the detection accuracy deteriorates due to window reflection interference
Solution Approach 1:
The patent applies preliminary action by pre-calculating the time delay value based on the known distance between the radar transmitter and the window, and the signal transmission speed. This pre-computed time delay is then used to configure the signal receiving circuit, ensuring that only reflected signals from obstacles (not window reflections) are captured. The preliminary calculation of time delay parameters resolves the contradiction by enabling accurate obstacle detection while avoiding window reflection interference.
2Reliability
If the signal receiving circuit operates continuously, then the detection coverage is maximized, but the false detection rate increases due to window reflection signals
Solution Approach 1:
The patent extracts and removes the harmful window reflection signals from the detection process by using time-domain filtering. The signal receiving circuit is configured to only receive signals after a predetermined time delay, effectively extracting and excluding the window reflection component from the total received signal. This extraction approach improves detection reliability by eliminating false detections while avoiding complex multi-stage filtering systems.
3Area of stationary object
If the radar system uses a window for signal transmission, then the field of view is expanded, but the detection accuracy deteriorates due to multiple reflected signals
Solution Approach 1:
The patent applies preliminary action by pre-calculating the time delay value based on the known distance between the radar transmitter and the window, and the signal transmission speed. This pre-computed time delay is then used to configure the signal receiving circuit, ensuring that only reflected signals from obstacles (not window reflections) are captured. The preliminary calculation of time delay parameters resolves the contradiction by enabling accurate obstacle detection while avoiding window reflection interference.
4Loss of information
If the processor processes all received signals, then the data processing volume is maximized, but the detection accuracy decreases due to interference from window reflection signals
Solution Approach 1:
The patent extracts and removes the harmful window reflection signals from the detection process by using time-domain filtering. The signal receiving circuit is configured to only receive signals after a predetermined time delay, effectively extracting and excluding the window reflection component from the total received signal. This extraction approach improves detection reliability by eliminating false detections while avoiding complex multi-stage filtering systems.
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 proposed system enhances the accuracy of radar detection by eliminating the impact of window-reflected signals, ensuring precise obstacle information is processed, thus improving the reliability of autonomous vehicle navigation.
Implementation Method 1
The radar transmitter is configured to: transmit a radar detection signal, and transmit the radar detection signal to an obstacle in front of the radar system through a window. The radar receiver is configured to receive a reflected signal generated when the radar detection signal encounters the obstacle.
Implementation Method 2
The signal receiving circuit may be configured to: when the radar transmitter transmits the radar detection signal, receive, after preset duration, the reflected signal transmitted by the radar receiver, convert the reflected signal into an electrical signal, and output the electrical signal to the processor.
Data Source
AI summary
This application discloses a signal receiving method and device, a medium, and a radar system. The radar system includes: a window, a radar transmitter, a radar receiver, a processor, and a signal receiving circuit. The radar transmitter is configured to: transmit a radar detection signal to a front obstacle through the window. The radar receiver is connected to the signal receiving circuit, and receive a reflected signal generated by the obstacle, and transmit the reflected signal to the signal receiving circuit. The signal receiving circuit is connected to the processor, and when the radar transmitter transmits the radar detection signal, receive, after preset duration, the reflected signal where the preset duration is a sum of first duration required for the radar detection signal to arrive at the window and second duration required for the reflected signal to arrive at the radar receiver from the window.