The Basic Idea

• Towers measure signal timing and strength
• Network estimates distance and direction to you
• Where measurements overlap, your location emerges

The Overlap Zone

• Three towers each measure your sector
• Their estimates intersect into one zone
• Trilateration narrows that zone tighter

Network Signals

• Cell ID flags the serving tower
• Timing advance gives rough distance
• Angle of arrival adds directional estimate

Directional Methods

• TDOA compares signal arrival times
• Antenna arrays infer angle of arrival
• Signal strength supports but rarely stands alone

Sensor Fusion

• GPS sharpens the carrier estimate
• Wi-Fi and Bluetooth add nearby anchors
• App telemetry tightens the picture further

Accuracy By Area

• Rural fixes span 500 metres to kilometres
• Suburban tightens to 100 to 500 metres
• Dense city fusion can fix you precisely

What Degrades It

• Few towers and hills widen the zone
• Concrete, steel, and shielding reflect signals
• Congestion and fast movement blur the fix

Operative Takeaways

• Assume an idle phone still reports
• Treat carrier records as one layer only
• Expect apps and Wi-Fi to sharpen tracking