Radar Presence Detection with Electronic Range Gating
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Solution Overview
Problem
Current radar-based presence detection systems, particularly Doppler and FMCW radars, face challenges in efficiently and cost-effectively detecting multiple moving objects within a detection area without disturbing ongoing traffic and are difficult to reconfigure due to mechanical adjustments and high hardware costs.
Innovation Solution
A method using a Doppler or FMCW radar that dynamically adjusts the detection range based on object speed, allowing electronic reconfiguration and reducing angle dependency, enabling precise detection and speed measurement even with multiple vehicles, using a speed sensor and control unit to estimate object entry and position within a predetermined area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical adjustment is used to reconfigure the detection area, then the detection range can be adjusted to a specific distance range, but access to the sensor is required which disturbs ongoing traffic and is difficult to implement
Solution Approach 1:
The patent replaces mechanical adjustment mechanisms with electronic control of the radar sensor. The detection range is configured through software parameters (gate start and gate length) rather than physical adjustment, eliminating the need for technician access to the sensor during traffic operations.
Solution Approach 2:
The invention changes the detection range by modifying electronic parameters (gate position and gate length) rather than physical configuration. This allows flexible adjustment of the detection area through software without requiring mechanical intervention or access to the sensor hardware.
2Measurement precision
If FMCW radar is used for distance and speed measurement, then both parameters can be measured, but the hardware costs increase due to required tunable signal sources and complex signal processing
Solution Approach 1:
The patent extracts only the necessary measurement capability from FMCW radar by using a simplified approach: measuring distance at a single gate position. This eliminates the need for complex tunable signal sources and sophisticated signal processing while maintaining adequate distance measurement functionality for traffic applications.
Solution Approach 2:
The invention uses a simpler, more cost-effective radar implementation that sacrifices some measurement sophistication for reduced hardware complexity and cost. The system uses fixed-frequency or simple FMCW radar with limited range gating rather than full-featured tunable FMCW systems.
3Productivity
If FMCW radar superimposes distance and speed signals, then both measurements can be obtained simultaneously, but complex signal processing is required to separate the signals
Solution Approach 1:
The patent extracts only the essential measurement data by focusing on distance measurement at a specific gate position rather than attempting to fully separate and process both distance and speed signals. This selective approach eliminates complex signal processing requirements while maintaining productivity for traffic detection applications.
4Device complexity
If simplified FMCW radar is used with alternate speed and distance measurement, then hardware costs are reduced, but the method only works with one vehicle in the detection area
Solution Approach 1:
The patent segments the detection area into multiple range gates, allowing simultaneous measurement of multiple vehicles at different distances. By dividing the detection range into discrete segments (gates), the system can track multiple objects independently while using simplified hardware architecture.
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 provides a simple, robust, and cost-effective solution for presence detection and speed measurement, allowing for dynamic adjustment of the detection area and reducing hardware costs, while maintaining precision and accuracy even at high speeds and with multiple vehicles.
Implementation Method 1
radar sensors are used for presence detection, particularly in applications in traffic engineering for detecting vehicle presence, distance and speed... only a change in the reflection phase of the reflecting object or scenario can be detected in addition to the reflection amplitude. Consequently, only the movement or speed of an object can be measured
Data Source
Figure 1~2
AI summary
The invention relates to method for the detection of at least one moving object (1) in a pre-determined detection range (ZD) by means of a speed sensor (2), comprising the following steps: determining a detection range (ZD) within an illumination region (ZL) of the speed sensor (2); detecting a speed signal, particularly a Doppler signal, at least with the entry of a moving object (1) into the illumination region (ZL); estimating an entry of the moving object (1) into the detection range (ZD) on the basis of a speed (V; Vr) of the object (1), and of a distance (d) between a boundary (dl; d4) of the illumination region (ZL) and the detection range (ZD).