A: Urban environments are primarily influenced by two factors: 1) Multipath effects (accounting for 60–80% of the error): Signals are reflected off high-rise buildings, making it impossible for the receiver to distinguish between direct and reflected signals, which results in a positional shift; 2) Degraded satellite geometry: High-rises obstruct the view, causing visible satellites to cluster within a narrow section of the sky, thereby worsening the Dilution of Precision (DOP). The combined effect of these two factors causes the positioning error to expand from the 2–5 meters typically observed in open terrain to 10–30 meters.

A: GPS signals are completely lost while inside a tunnel. Our devices utilize Inertial Navigation (IMU) assistance: upon entering a tunnel, the device estimates the vehicle's position based on its last valid location, speed, and heading; for short tunnels (under 500 meters), the recorded trajectory remains continuous and uninterrupted. After exiting a tunnel, aided by A-GPS (which downloads satellite ephemeris data via the cellular network), signal re-acquisition typically takes 3 to 10 seconds. All data generated inside the tunnel is cached locally and automatically uploaded once the vehicle exits, ensuring that no data is lost.

A: When traveling at high speeds, the Doppler effect causes a shift in signal frequency, which may result in a brief positioning lag. Our devices utilize high-dynamic reception algorithms; consequently, the decline in accuracy is negligible at speeds up to 150 km/h (with an error increase of approximately 20%). Based on actual test data: at a speed of 120 km/h, the 95% error margin increases by approximately 3–5 meters compared to a stationary state. While the trajectory may exhibit a slight "trailing" effect, this does not compromise the overall determination of the travel path.

A: Every product batch undergoes RF calibration and positioning consistency testing; under identical environmental conditions, the variation is typically less than 10%. We can provide factory test reports and support consistency verification using sample units prior to bulk purchasing. Any batch-to-batch variations are primarily caused by changes in component suppliers; we ensure consistency through rigorous IQC (Incoming Quality Control) and IPQC (In-Process Quality Control) procedures.

A: The antenna and RF circuitry themselves will not experience significant degradation due to aging. However, a drop in battery voltage may affect the receiver's sensitivity (particularly in devices utilizing non-rechargeable batteries). We recommend regularly monitoring the battery status; the platform provides a low-battery alert (triggered when the remaining charge reaches 20%) to ensure that batteries are replaced or recharged in a timely manner—before any decline in accuracy occurs.

A: Firmware upgrades may include algorithm optimizations; however, we conduct rigorous testing prior to every release to ensure that positioning accuracy remains undiminished. We employ a phased rollout strategy, allowing you to first test the update on a small subset of devices and proceed with a mass upgrade only after confirming everything is functioning correctly. Should any issues arise, you can utilize our one-click rollback feature to revert to the previous version, thereby ensuring business continuity.

A: We strongly recommend conducting a pilot test: purchase 2–5 sample units and operate them in your actual deployment environment for 1–2 weeks. We provide remote technical support to assist with setting up the test protocol, collecting data, and analyzing the results. The cost of the sample units can be credited against a subsequent bulk order. The resulting test report will serve as the basis for your evaluation and decision-making.

A: We offer a three-tiered support system: 1) Remote Diagnosis: Analyzing the issue through platform logs (covering installation location, signal obstruction, and parameter configuration); 2) Parameter Optimization: Adjusting reporting frequency, filtering parameters, and auxiliary positioning strategies; 3) On-site Support: For major projects, we can dispatch engineers to the site to conduct troubleshooting. The vast majority of accuracy-related issues can be resolved through the first two steps.

A: The two technologies operate on different principles and cannot be directly compared. In open outdoor environments, the positioning accuracy of a GPS tracker (2–5 meters) is superior to that of an AirTag (5–20 meters), and it provides real-time updates. Indoors, at close range (<10 meters) and when paired with UWB technology, an AirTag can achieve an accuracy of 0.3 meters; however, its location updates rely on passing devices and are not real-time. For scenarios requiring continuous, real-time monitoring—such as vehicle anti-theft or personal safety—a GPS tracker is the only viable choice.