In-Car Pulse Radar Noise Isolation via Signal Delay
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Solution Overview
Problem
Conventional in-vehicle pulse radar systems face challenges in accurately detecting objects due to noise signal interference caused by electromagnetic coupling in downsized multi-pin board-to-board connectors, which complicates the structure and increases costs.
Innovation Solution
The implementation of a delay circuit that applies a predetermined delay time to the baseband signal and control signal, using a low-pass filter to prevent noise signal overlap, allowing for accurate object detection with a simple configuration and reducing the complexity and cost of the connector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a downsized multi-pin board-to-board connector is used to reduce size and cost, then the connector size and cost are reduced, but electromagnetic coupling between terminals increases causing noise signal interference
Solution Approach 1:
The patent applies preliminary action by introducing a delay circuit that preemptively delays the control signal before it reaches the terminal. This delay ensures that the control signal and receiving signal do not overlap in time at the terminal, preventing electromagnetic coupling and noise interference before it can occur during signal transmission through the downsized connector.
2Object-affected harmful factors
If ferrite or grounding terminals are added to prevent noise signal leak, then noise isolation is improved, but connector structure becomes complicated and size increases
Solution Approach 1:
The patent extracts the noise isolation function from the physical connector structure and relocates it to the signal processing domain. Instead of modifying the connector hardware with ferrite or grounding terminals, the invention extracts the control signal timing and adjusts it through a delay circuit, separating the noise isolation function from the connector itself and achieving it through temporal separation rather than structural modification.
3Volume of moving object
If terminal pitch is narrowed to reduce connector size, then connector compactness is improved, but electromagnetic coupling between terminals increases
Solution Approach 1:
The patent applies preliminary action by introducing a delay circuit that preemptively delays the control signal before it reaches the terminal. This delay ensures that the control signal and receiving signal do not overlap in time at the terminal, preventing electromagnetic coupling and noise interference before it can occur during signal transmission through the downsized connector.
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 separates noise signals from the receiving signal, enabling accurate object detection while using a small, low-cost connector, thereby addressing the interference issues and simplifying the connector structure.
Implementation Method 1
a delay circuit that outputs the baseband signal by applying a predetermined delay time to the baseband signal
Implementation Method 2
using a low-pass filter to prevent noise signal overlap
Implementation Method 3
a receiving antenna configured to receive reflected wave of the radio wave emitted from the transmitting antenna and returned by being reflected by an object
Implementation Method 4
a transmitting antenna configured to emit the transmission signal generated by the transmitting section to the air as radio wave
Data Source
Figure 1~2
Figure 3~4
AI summary
There is provided an in-vehicle pulse radar that permits to detect information on an object accurately by temporally separating a noise signal mixed into a receiving signal by applying a delay time with a simple configuration. A baseband signal down-converted by a frequency converter (152) is output to a signal processing section (102) through a board-to-board connector (103) after passing through a delay circuit (153). Still further, a control signal is output to a switching circuit (151) from a control signal generating section (162) through the board-to-board connector (103). The delay circuit (153) increases a time lag from when the control signal passes through the board-to-board connector (103) until when the baseband signal passes through the board-to-board connector (103) by applying a predetermined delay time to the baseband signal. Thereby, the baseband signal receives no interference from the control signal.