Radar Signal Collision Avoidance via Time-Delayed Transmission
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Solution Overview
Problem
Radar devices experience signal collisions when operating in the same environment, leading to false alarms and reduced performance due to interference, especially when central coordination is not feasible and frequency band constraints are present.
Innovation Solution
Implementing a method where radar devices transmit signals with time delays that are a sum of a common base time and unique delays, shorter than the base time, to minimize signal collisions and false alarms, allowing for independent operation without significant frequency band reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If radar devices transmit signals in the same environment without coordination, then device complexity is reduced and ease of operation is improved, but signal collisions occur causing false alarms and reduced reliability
Solution Approach 1:
The patent changes the time parameter of signal transmission by introducing wait intervals with unique time delays for each radar device. This parameter modification allows devices to operate independently while avoiding signal collisions, thus maintaining both ease of operation and detection reliability
Solution Approach 2:
The patent applies preliminary action by calculating and setting appropriate wait intervals before radar devices begin transmission. This pre-established timing arrangement ensures that signal collisions are avoided from the start, allowing independent operation without compromising detection accuracy
2Reliability
If radar devices use temporal spacing to avoid signal collisions, then reliability is improved, but device complexity increases due to requirement of central control unit
Solution Approach 1:
The patent implements self-service by enabling each radar device to independently determine its own transmission timing based on pre-calculated wait intervals. Each device autonomously adjusts its transmission schedule without requiring continuous communication with a central control unit, thereby maintaining reliability while reducing system complexity
Solution Approach 2:
The patent segments the coordination function by distributing timing control to individual devices rather than centralizing it. Each radar device independently manages its own transmission timing based on its unique time delay, eliminating the need for a complex central control system while maintaining signal collision avoidance
3Reliability
If radar devices increase the time separating consecutive transmissions to accommodate more devices, then signal collision avoidance is improved, but productivity decreases due to reduced detection cycles
Solution Approach 1:
The patent optimizes the time delay parameter by setting it to a specific value that is sufficient to avoid signal collisions but minimal enough to maintain high detection cycle frequency. This optimized parameter allows multiple devices to operate simultaneously without excessive waiting periods, preserving both reliability and productivity
4Reliability
If radar devices use different frequency bands to avoid signal collisions, then reliability is improved, but measurement precision deteriorates due to reduced frequency band width
Solution Approach 1:
The patent transitions from frequency domain separation to time domain separation for avoiding signal collisions. By introducing temporal spacing through wait intervals, the patent maintains the full frequency band width for each device (preserving measurement precision) while achieving reliable signal discrimination through time-based differentiation
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 reduces the occurrence of false alarms by ensuring signal collisions occur outside a critical risk interval, allowing for stable operation without continuous central coordination and maintaining radar resolution by minimizing the overall duration of detection cycles.
Implementation Method 1
detect the presence of objects in an environment by transmitting an electromagnetic signal and detecting the signal reflected from the environment
Implementation Method 2
detecting the signal reflected from the environment
Implementation Method 3
a time delay of the reflected signal from the transmitted signal is generally recognized for determining the distance of the object
Data Source
AI summary
A method of detecting objects in an environment using coexisting radar devices is disclosed. According to the method, the transmission intervals of the devices are spaced apart by a wait time given by the sum of a base time, common to all the radar devices, and respective time delays, differing between devices and shorter than the base time. For each pair of devices the difference between the time delays is less than the transmission time but is at least twice a risk time in which a collision between the signals of different radar devices can be confused for an object to be detected. Given a sequence of detection cycles, a radar device is determined to have detected a target if the result of the detection is positive for a number of consecutive detections which is at least equal to the number of radar devices.