GSM Base Station Simulator (IMSI Catcher)

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System for Detecting GPS Trackers, GSM Bugs and Cellular Transmitters

The Harpoon GSM Base Station Simulator is a professional counter-surveillance system designed to detect and locate hidden tracking, listening and data-transmission devices operating through cellular networks.

The system creates a controlled GSM environment in which any device using a SIM card must register and reveal its activity. This makes it possible to detect even covert devices that normally operate silently or transmit only for short periods of time.

The system is used by security services, corporate security departments and private asset owners to protect vehicles, facilities and confidential information.

The complex can simultaneously operate up to four independent GSM base stations on arbitrary GSM900 and DCS1800 channels. It works in isolated or shielded environments without connecting to real cellular networks, allowing operators to identify and localize active devices as well as detect sleeping GPS trackers regardless of their transmission interval.

In many situations companies and vehicle owners search for ways to detect a hidden GPS tracker in a car or vehicle. Tracking devices can be installed without the owner’s knowledge and transmit location data through GSM cellular networks. In such cases professional counter-surveillance equipment such as a GSM base station simulator (IMSI catcher) is used to detect hidden GPS trackers, GSM listening devices and other cellular transmitters. This type of system creates a controlled GSM environment and allows security specialists to identify any device with a SIM card operating nearby, including covert GPS trackers installed in vehicles or devices that transmit only periodically. For this reason, GPS tracker detection systems and GSM surveillance detection equipment are increasingly used for vehicle protection and corporate security in the United States, Europe and other regions.

What Devices Can Be Detected

Tracking Devices

Hidden GPS trackers
Magnetic vehicle trackers
“Sleeping” trackers with any transmission interval

GSM Surveillance Devices

Hidden GSM listening devices (GSM bugs)
GSM surveillance transmitters
SIM-based surveillance modules (A8 mini and similar devices)
GSM-controlled detonators

The system can also detect any device operating in GSM networks, including legitimate cellular modules installed in vehicles, such as:

satellite security systems (Pandora, Cobra, Caesar Satellite, etc.)

ERA-GLONASS modules

factory telematics systems

Why Conventional Detection Methods Often Fail

Non-linear junction detectors
Modern vehicles contain large amounts of semiconductor electronics and metal components. In most cases, manual inspection with lighting and endoscopic tools is more effective than using a non-linear junction detector.
RF field detectors
These devices require multiple conditions simultaneously: a quiet environment, proximity to the transmitter and an active transmission moment. In real conditions, detection becomes unreliable.
Radio monitoring systems
Traditional spectrum monitoring systems cannot reliably distinguish GSM devices from each other or determine their installation location. They also require disabling all legitimate GSM modules in the vehicle.
Vehicle disassembly
Disassembling the vehicle does not guarantee results. A tracker can be hidden inside wiring insulation or integrated into another electronic module.

GSM Base Station Simulator – System Capabilities

Up to 4 independent GSM channels simultaneously
The SIM card used in a surveillance device and its roaming configuration are usually unknown. Multiple channels ensure coverage of all possible scenarios.
Long-term stable operation
The system can operate continuously for extended periods without synchronization loss or frequency drift.
Full GSM activity simulation
Calls, SMS and mobile data sessions are fully supported. The device performs its complete activity cycle, allowing operators to collect maximum intelligence for classification and analysis.
IMEI, IMSI and APN identification
Critical parameters for identifying the detected device.
Registration logs
The system records when each subscriber appears and disappears from the network, making it possible to analyze device behavior over time (for example: a tracker appearing every five hours).
Call logging
If a hidden GSM bug calls its operator, the system records all relevant data.
SMS capture
Service SMS messages sent by trackers (for example, with coordinates) can be captured and analyzed.
Forced device activation
Devices can be forced into active radio exchange, enabling precise localization using RF detectors.
Tracker retention in the network
If technically possible, the system can keep a sleeping tracker online to prevent it from powering down.
Internet traffic logging
Provides an additional channel for analyzing unknown devices without physical access.
Signal level monitoring (RX level)
Additional data for device localization.
Remote monitoring
Operators can monitor the system remotely without constant physical presence.

The system is delivered fully ready to operate out of the box.
Control is performed through a simple graphical interface, and system launch requires only a single command.

Training and Demonstration

Comprehensive training for security personnel can be provided, covering the detection methodology and operation of the system until practical results are achieved. Technical support is also available.

A live demonstration of the system is available in Moscow. For clients from other regions or countries, remote demonstrations via the Internet can be arranged.

On-site demonstrations or training worldwide may also be considered, subject to travel cost and time compensation.

Price of the GSM Base Station Simulator

The price of the system depends on configuration, number of simultaneous channels and selected options. The system can be supplied in different configurations tailored to specific operational requirements.

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