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Active Cellular Direction Finder

SDR‑based active cellular location solution supporting vehicle‑mounted and man‑pack deployment, used to capture IMSI/IMEI and geolocate 2G‑5G mobile handsets for tactical law‑enforcement operations.

Active Detection IMSI/IMEI Capture Target Locking
Active Cellular Direction Finder workflow diagram showing virtual neighbour‑cell emulation, vehicle & man‑pack deployment, target‑phone attachment and non‑target release logic.

Overview

Active Cellular Direction Finder. Built upon software‑defined radio architecture, this all‑in‑one tactical system supports dual deployment modes: vehicle‑mounted chassis and portable man‑pack unit. It emulates cellular neighbour‑cell to interact with surrounding mobile terminals, extract subscriber identifiers and achieve geolocation for 2G‑5G devices. Non‑target mobile phones are handed‑back to real base‑stations without disrupting normal subscriber communications for field investigation tasks.

Workflow

Virtual Neighbour‑Cell Working Flow. The system acts as a simulated cellular base‑station. Nearby mobile phones attach to this virtual neighbour‑cell. Target devices are retained for data acquisition and locking. All non‑target handsets are immediately released and handed over back to operator real‑world BTS, avoiding interference to ordinary mobile‑phone services. Operators conduct target monitoring and positioning from the control terminal.

Highlight Features

Dual‑Mode Deployment Supports vehicle‑mounted heavy‑duty chassis and compact field‑ready man‑pack configurations with swappable battery.
Multi‑Band 2G‑5G Support Covers major cellular bands, hardware channel count and frequency ranges can be custom‑configured for mission needs.
Automatic Environment Survey Scans surrounding cellular networks automatically, collects parameters and provides configuration recommendations for operators.
IMSI & IMEI Harvesting Detects surrounding mobile subscribers and captures IMSI / IMEI identifiers for intelligence recording and analysis.
Black‑White List Alerting Import target identifiers for black‑list or white‑list; triggers real‑time alerts when matching mobile terminals are detected.
Multi‑Target Lock & Hot‑Swap Attach and lock selected targets, supports manual or automatic positioning and seamless switching among multiple tracked devices.
Frequency Redirect Capability Redirect locked‑on target terminals onto user‑specified cellular frequency cells for sustained tracking sessions.
GPS Route Logging & GIS Display Record vehicle GPS trajectories and visualise movement history within integrated GIS map view for situational awareness.

Specifications

Key Brief Parameters

  • Vehicle Unit: 8‑channel, 20 W per‑channel, max coverage up to 2000 m, powered by 220 V AC
  • Man‑Pack Unit: 4‑channel, 5 W per‑channel, coverage 100‑300 m, 2‑h removable battery runtime
  • Positioning Accuracy: < 1 m under proper deployment conditions
  • Operating Temperature: −20 °C ~ +65 °C; Storage Temperature: −30 °C ~ +70 °C
  • Supported Bands: Customizable B1/B3/B5/B8/B40 cellular frequency bands