GPS Radar Detection for Filtering Stationary False Alarms
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Solution Overview
Problem
Radar detectors frequently generate false alarms due to unrelated microwave signals from sources like automatic door systems, traffic management systems, and other devices, reducing their credibility and effectiveness.
Innovation Solution
A GPS-enabled radar detector that uses geolocation to identify and filter out signals from known stationary sources by comparing its position to a database of unwanted locations, enhancing its ability to distinguish between police radar and other microwave signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar detectors monitor all microwave signals in X, K, and Ka bands, then detection capability is improved, but false alarm rate increases due to unrelated sources like automatic door systems
Solution Approach 1:
The patent segments the detection space into multiple geographic zones using GPS coordinates. Each zone is independently characterized and stored in a database. The detector divides the monitoring task by location, applying different alerting strategies to different zones, thereby reducing false alarms in areas with known unrelated sources while maintaining detection capability.
Solution Approach 2:
The patent introduces an intermediary database that stores pre-characterized geographic zones with their associated signal patterns. This intermediary layer acts as a mediator between the raw signal detection and the final alert generation, allowing the system to distinguish between police radar and unrelated sources by comparing detected signals against the stored zone characteristics.
2Measurement precision
If radar detectors generate alerts for all detected signals, then detection sensitivity is improved, but user credibility decreases due to excessive false alarms
Solution Approach 1:
The patent implements dynamic alerting behavior that adapts to the detector's current location. The system continuously updates its alerting strategy based on real-time GPS position and the stored zone database. In zones with high false alarm rates, the system dynamically suppresses alerts, while in zones with potential police radar activity, it maintains high sensitivity, thereby preserving user credibility.
Solution Approach 2:
The patent changes the alerting parameter (alert suppression) based on the geographic zone. By modifying the alerting behavior parameter according to location, the system achieves high detection sensitivity in relevant zones while reducing false alarms in zones with known unrelated sources, thus maintaining user credibility.
3Object-generated harmful factors
If radar detectors use GPS location data to filter signals, then false alarm reduction is improved, but device complexity increases
Solution Approach 1:
The patent makes the GPS receiver serve multiple functions: it provides location data for both navigation purposes and for false alarm reduction by identifying geographic zones. This multi-functionality allows the system to reduce false alarms without adding dedicated hardware, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent performs preliminary characterization of geographic zones and stores this information in a database before actual detection operations. By pre-processing and storing zone information, the system avoids complex real-time analysis during detection, reducing the computational complexity and hardware requirements while still achieving effective false alarm reduction.
Data Source
AI summary
Provided is a radar detector that aids in management of unimportant sources, dynamically improving handling of such sources based upon previously-stored geographically-referenced information on such sources. The detector determines location of the detector, and compares it to locations of known sources, to improve handling of such detections. The detector may ignore detections received in an area known to contain a stationary source, or may only ignore specific frequencies or handle frequencies differently based upon historic trends of spurious police radar signals at each frequency, or based on geofenced locations. GPS is used to establish current physical coordinates. The detector maintains a list of the coordinates of known stationary source “offenders” and geofence coordinates or boundaries in nonvolatile memory. When a microwave or laser source is detected, it may compare current coordinates to geofence boundaries and/or sources in this list. Notification varies depending on the stored information and current operating modes.