GPS interference is the process of using frequency transmitting equipment to prevent or interfere with radio communication. Communication types that may be interfered include telephone, SMS, GPS system and Wi-Fi network. This term is also called GPS spoofing, and the equipment used can also be called mobile phone or signal jammer.

　　These devices are then adapted to consumers who wish to ensure privacy or prevent tracking. However, without proper technical knowledge or in the wrong hands, GPS jammers can cause potentially disruptive interruptions in communications.

　　Global Positioning System jamming devices can be used in a variety of applications, such as:

　　Concealing the location of a device or vehicle.

　　Hides, changes, or obscures GPS positioning signals.

　　Prevent Wi-Fi enabled devices from successfully connecting to the Internet.

　　Mobile devices are prohibited from making or receiving calls, text messages, or e-mails.

　　While GPS interference opportunities cause minor interference, such as signal loss, they also pose a significant risk to public safety. For example, GPS jammers cannot differentiate between communication types and may block incoming or outgoing calls from emergency responders. In addition, these devices can block more than one call and interrupt all communications over a wide frequency range.

　　As more and more industries, such as law enforcement and transportation, rely on GPS devices, interference has the potential to interfere with business-critical operations and data. In fleet management tracking, GPS information can be linked to data such as fuel ge, driving behaviour, engine health, vehicle synchronization and safety indicators. As a result, jammers can destroy all this information and cause serious interruptions.

　　Once the cell phone jammer starts working, you can practically test it by monitoring the signal on the average user's GPS receiver or on the high-quality communications receiver. A GPS receiver close to the jammer will not be able to obtain a C / A code lock and any operating GPS in the jammer radiation mode will lose the C / A code lock. High-quality GPS receivers tend to be less susceptible to low-power interference, so you need to be in the antenna's near-field radiation mode (i.e. close) to operate.

　　Any obstruction near the jammer's own antenna (trees, houses, hills, walls, etc.) will reduce the interference range. The best position is between the jammer's antenna and the line of sight of the GPS receiver antenna you're trying to jam. Real-world results will vary widely, but you should be able to get hundreds of feet of interference radius even in heavily obstructed areas with higher power (AH102) options and a simple antenna.

　　You can even practice anti-jamming techniques to protect yourself from hostile or accidental GPS interference. Place your body, trees, hills, rocks, or other obstacles between your position and the source to protect your GPS receiver from the source. More advanced methods include using a directional or maneuverable phased array antenna on a GPS receiver (pointing into the sky) to counteract any ground-based interference.

　　The main functions that GPS positioning system can realize in civil use are:

　　Call the traffic command function, and the command center can monitor the operation of vehicles in the area, and reasonably dispatch and monitor vehicles. The command center can also communicate with the tracking target at any time to realize management.

　　Route navigation function: providing route planning is an important auxiliary function of vehicle navigation system, including automatic route planning and manual route design. Automatic route planning means that the driver determines the starting point and destination, and the computer software automatically designs the optimal route according to the needs, it includes calculating the fastest route, the easiest route, and the least number of routes. In the artificial route design, the driver designs the starting point, the ending point and the road point according to own destination, and establishes the route database automatically. After the path planning is completed, the display can display the designed path on the electronic map, showing the vehicle's path and driving mode at the same time.

　　Vehicle tracking function; GPS and electronic map can display the actual position of the vehicle in real time, and can be enlarged, reduced, restored and changed at will; It can move with the target and keep the target on the screen; Vehicles, multi-screen synchronous tracking. Use this function to track and transport important vehicles and goods.

　　Information inquiry function: It provides the user with the database of the main objects such as tourist attractions, hotels, hospitals, etc., and the user can display his position on the electronic map. At the same time, the monitoring center can inquire the location of any target in the area through the monitoring console, and the vehicle information will be displayed on the electronic map of the control center in digital form.

　　Interference is likely to become more common as 5G systems enter the frequencies used by gps blocker. The point is that civil jammers are completely open, they're not encrypted, they're not authenticated, they're completely open, and they're completely immune to spoofing attacks. Mobile direction finding system can detect and locate GPS interference source. Spectral analysis to determine interference duration and signal type can also be used to indicate whether the interference is accidental or intentional.

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