Directional Radar Location Detection System
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Solution Overview
Problem
Conventional indoor location detection systems using radar suffer from high false detection rates due to microwave signals passing through walls, leading to increased costs for security measures from unnecessary alarms.
Innovation Solution
A location detection system employing multiple directional radar sensors with partially overlapping radio coverage and a controller to determine the location of objects without complex angle measurements, using a narrow sweep bandwidth and limited range resolution to prevent through-wall detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radar systems use wide sweep bandwidth to achieve high range resolution, then the ability to distinguish between closely-spaced target objects is enhanced, but the complexity of the system increases and false detection rates rise due to through-wall detection
Solution Approach 1:
The system divides the detection space into multiple regions using multiple directional radar sensors, each covering a specific angular sector. This segmentation allows the system to achieve accurate location detection without requiring each sensor to have high range resolution through wide bandwidth, thereby reducing system complexity while maintaining detection precision through spatial division.
Solution Approach 2:
The patent transitions from relying solely on range resolution (one dimension) to using angular information from multiple directional sensors (adding another dimension). By detecting objects in different angular sectors and combining this directional information with range data, the system achieves precise location detection without requiring wide sweep bandwidth, thus resolving the contradiction between measurement precision and device complexity.
2Length of stationary object
If conventional radar systems emit microwave signals with high power to detect objects at long range, then the detection range is extended, but false detection rates increase due to signals passing through walls
Solution Approach 1:
The system employs multiple directional radar sensors, each with a specific facing direction and corresponding radio coverage area. Each sensor is optimized for its local detection zone, creating focused beams that cover specific angular sectors. This local quality approach allows the system to achieve adequate detection range within each sector while preventing signals from propagating through walls into adjacent areas, thereby reducing false detections caused by through-wall penetration.
Solution Approach 2:
By dividing the overall detection space into multiple directional sectors using separate radar sensors, the system limits the propagation of microwave signals to specific zones. This segmentation prevents signals from one detection zone from penetrating through walls into adjacent zones, reducing false detections while maintaining adequate detection range within each segmented area.
3Measurement precision
If conventional radar systems use highly directive antennas with complicated angle measuring processes, then the azimuth and elevation angles of target objects are determined accurately, but the device complexity increases
Solution Approach 1:
The system uses multiple directional radar sensors, each with a predetermined facing direction, to segment the detection space into angular sectors. Instead of using highly directive antennas with complex angle measuring mechanisms, the system achieves angular information by determining which sensor detects the object and in what direction relative to that sensor's facing direction. This segmentation approach provides accurate angle measurement while significantly reducing device complexity.
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
Effectively reduces false detection rates by accurately identifying object locations within defined spaces using a limited bandwidth, enhancing detection accuracy while preventing undesirable through-wall detection.
Implementation Method 1
a location detection system employing multiple radar sensors to detect a location of a moving object
Implementation Method 2
microwave signals emitted from radar passing through walls
Data Source
AI summary
A location detection system includes a first directional radar sensor, a second directional radar sensor and a controller. The first directional radar sensor has a first facing direction and a first radio coverage correspondingly, and is used to receive a first response signal upon detecting an object. The second directional radar sensor has a second facing direction and a second radio coverage correspondingly, the second radio coverage being partially overlapping with the first radio coverage, and is used to receive a second response signal upon detecting the object. The controller is used to determine which region the object is located in according to receptions of the first response signal and the second response signal.