Radar Pulse Duration Jitter for Interference Suppression
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Solution Overview
Problem
Existing methods for determining parameters to correlate two objects, such as vehicles and their surroundings, are susceptible to interference from electromagnetic signals, leading to incorrect warnings and reduced driver acceptance.
Innovation Solution
A method that varies the transmission duration of electromagnetic pulses in consecutive sequences to introduce 'jitter', which blurs strong interference peaks, reducing the need for active filtering and improving evaluation accuracy by making interference signals less distinct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic signals are used to monitor adjacent lanes and detect vehicles, then the ability to detect objects is improved, but susceptibility to interference from jamming transmitters and power supply signals increases
Solution Approach 1:
The invention applies dynamics by continuously varying the transmission duration of radar pulses in a pseudo-random manner. This dynamic adjustment prevents stationary interference sources (such as power supply signals and jamming transmitters) from establishing consistent correlation peaks, while still allowing moving vehicles to be detected through their Doppler-shifted return signals.
Solution Approach 2:
The invention changes the parameter of transmission duration dynamically. By varying the pulse width in a pseudo-random sequence, the system alters the temporal characteristics of transmitted signals, which disrupts the correlation between stationary interference sources and received signals, thereby reducing false detections from interference.
2Reliability
If transmission duration is varied to reduce interference susceptibility, then false alarms are reduced, but the complexity of the transmission control increases
Solution Approach 1:
The invention uses a pseudo-random sequence generator to control transmission duration variations. This copying approach generates a reproducible yet unpredictable pattern that can be regenerated at both transmitter and receiver, simplifying the control mechanism while maintaining effective interference suppression through consistent pseudo-random variation.
3Object-affected harmful factors
If groups of eight long pulses and eight short pulses are alternately generated, then interference susceptibility is reduced, but the device complexity and structural complexity increase
Solution Approach 1:
Instead of using fixed alternating groups of long and short pulses, the invention dynamically varies transmission duration in a pseudo-random manner. This dynamic approach achieves interference suppression without requiring complex group structures, reducing both device and structural complexity while maintaining effectiveness.
Solution Approach 2:
The invention simplifies the approach by continuously varying the transmission duration parameter in a pseudo-random sequence rather than using fixed alternating patterns. This reduces the structural complexity of pulse generation while maintaining the ability to suppress interference through parameter variation.
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 suppresses interference peaks, reducing false alarms and enhancing system acceptance by drivers, as the method does not require additional filtering and maintains accuracy in determining parameters like distance and relative speed.
Implementation Method 1
a plurality of successive transmission pulse sequences, each containing at least one transmission pulse of an electromagnetic signal, are emitted
Implementation Method 2
In the receiving circuit, this high frequency is downconverted
Implementation Method 3
the transmission duration of the individual transmission pulses is varied from transmission pulse sequence to transmission pulse sequence in order to reduce the susceptibility to interference
Data Source
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AI summary
The present invention relates to a method for determining at least one parameter for correlating two objects (10, 20), in particular the distance (r) therebetween, and/or the relative velocity (v) of said two objects (10, 20), wherein a plurality of successive transmission pulse sequences, each having at least one transmission pulse of an electromagnetic signal, forms a series of transmission pulse sequences, wherein the transmission duration of the individual transmission pulses varies from transmission pulse sequence to transmission pulse sequence, in order to reduce the interference as the at least one parameter is being determined.