How to jammer all wireless signals?

The so-called signal shielding means that the receiving device cannot obtain a signal with a signal-to-noise ratio that meets the signal identification requirements. Signal to noise ratio (Signal Noise Ratio, SNR) is the most important content.

We can refer to the formula:

SNR = \frac{P_{Signal}}{P_{Noise}}

Therefore, there are two ideas for reducing the signal-to-noise ratio:

1. Reduce signal strength
2. Increase noise intensity

Based on the above ideas, we can use signal jammers to interfere/shield wireless signals.

The function of a signal jammer is to shield signals and is used in many situations. Nowadays, information spreads very fast. With a mobile device, all kinds of information can be spread to every corner in an instant. For some occasions where information cannot be spread, mobile phone signal cellphone jammer are very necessary.

Within a certain frequency range, mobile phones and base stations are connected through radio waves to complete data and sound transmission at a certain baud rate and modulation method;

Based on the above communication principle, the Dazhan jammer scans from the small-end frequency of the forward channel to the big-end at a certain speed during the working process. This scanning speed can cause garbled interference in the message signals received by the mobile phone. The mobile phone cannot detect normal data sent from the base station, making it impossible for the mobile phone to establish a connection with the base station. Communication equipment exhibits phenomena such as searching the network, no signal, and no service system.

Basic principles of 5G shielding:

Mobile phone signal jammers (jammers) achieve interference and shielding of wireless communication signals by emitting co-channel interference signals. The transmit power of the wifi signal jammer directly affects the strength of the interference signal, thereby indirectly affecting the shielding effect of the signal jammer. There is a positive correlation between these three. In other words, the stronger the transmission power, the stronger the interference signal, and the better the theoretical shielding effect in the same environment.

What factors affect the shielding effect? In the actual use environment, the interference signal emitted by the mobile phone signal jammer is affected by various factors, the most important of which are the following:

• The indoor jammer is recommended to be placed at a height of about 180cm-220cm above the ground, preferably at a forward angle.
• Is there any obstruction (such as walls, metal products, human body, etc.) between the gsm signal jammer and the wireless communication device (mobile phone, etc.). The interference signal emitted by the jammer will attenuate to varying degrees after passing through the obstruction, so please try to avoid it.
• The original wireless communication signal strength in the application environment of the jammer. The weaker the wireless communication signal strength in the use environment, the stronger the theoretical shielding effect of the jammer.
• The distance between the application environment of the jammer and the communication base station. The farther the application environment of the jammer is from the base station, the stronger the theoretical shielding effect of the jammer.

French police destroy start-up Air Colis to transport drones prisons

Deliveries of banned materials to prison inmates via drone are becoming increasingly ambitious and bold around the world, but an aerial smuggling ring busted by police in western France stands out for its quasi-startup organization and efficiency.

This summer, four gang members were arrested after Nantes police launched an investigation into the movement of contraband phones and drugs found during cell phone blocker searches. What they discovered was not only a well-organized and frequently used system for delivering prey using a DJI Mini, but also a Snapchat-based method of acknowledging commands from within Clink.

The perpetrators even gave their illegal company a name: Air Colis

Police became aware of the plan when guards first spotted a drone jammer hovering outside the window of a prison in Nantes. The next morning, authorities discovered 36 smartphones and 1.6 kilograms of drugs hidden by inmates. A month later, staff at another regional correctional facility spotted a drone making similar nighttime deliveries — an activity that was repeated at two other regional prisons around the same time.

Drone deliveries were often made to all four prisons on the same night, prompting local military police to cautiously begin investigations. They gradually discovered an operation (albeit illegal) that could teach the beleaguered Amazon Prime Air a lot.

This is how it functioned

Inmates monitoring contraband sales in their respective prisons placed orders with an outside partner, who in turn contacted four Air Colis organizers. The weight of each drone's payload (whether drugs, iPhones or tobacco) is limited to 500 grams, and transport costs a flat rate of 400 euros ($422). The contraband flown in was exchanged at a not-so-remote clandestine meeting point (a McDonald's parking lot in Nantes), where it was weighed and photographed so that the prisoners could confirm that the content on the Snapchat was what they intended. What’s needed – a crime hedge against unsatisfied customers returning goods.

Nantes police, who busted the aerial quartet, said the drone-dropped shipments would be delivered directly to recipients waiting at the prison windows, and light jamming signal would be used to guide the ships to their location. The flights were flown in the middle of the night to four different prisons in western France, with each mission divided into five to ten missions, meaning multiple missions to the same prison were sometimes carried out in quick succession.

It is estimated that Air Colis made at least 50 shipments before police tracked down the gang in late September and revealed details of the operation.

The raid, which halted an illegal prison airlift, uncovered nine DJI Minis (including at least one original Mavic, according to police photos), several spare batteries, 500 grams of cocaine, a kilogram of marijuana and 900 euros ($950). Cash and thermal binoculars control the drone to identify the correct unit window at night.

"It's like an Uber delivering directly to the window," Nantes prosecutor Renaud Gaudeul said when announcing the arrest. "This is definitely not a trivial operation. As far as I know, France has never Things like this happen ... and it's good for criminals to see investigators doing their best as well."

If things continue this way, French police will need to further refine their counter-drone efforts. This summer alone, Air Colis is estimated to have transported more than 50 drones, bringing the number of confirmed drones entering French prisons in 2022 to 68, according to corrections officials. The number was more than 37 the year before. At this rate, the occupants of the car will be discovered the next time police conduct a search using a special app.

Suspect uses cell interference technology avoid surveillance cameras

Cellular interference involves the use of equipment that interferes with radio or wireless signals

Cell destruction can be done with a device placed about 30 feet away from the intended target or via a home camera.

CMPD says thieves have figured out how to bypass security cameras and use technology in some burglaries.

This is called "cell interference" and occurs when a person uses a device to interfere with a radio or wireless signal.

According to the Federal Communications Commission, "It is a violation of federal law to use a phone jammer, GPS blocker, or other signal jamming device designed to intentionally prevent, interfere with, or disrupt authorized radio communications." A business, classroom, residence or vehicle. "

Cell destruction can be done with a device placed about 30 feet away from the intended target or via a home camera.

Video from a south Charlotte neighborhood shows a suspect sneaking through yards at night, but not all of the incident was caught on camera.

"Anytime you have wireless devices, whether it's Wi-Fi or whatever, you know people are going to find a way - how to jam them, how to try to prevent something from communicating," CPI Security Customer Operations said.

Within a few moments, someone is visible on camera, but as cells burst, with the push of a button or button, the person disappears or is not recorded.

CMPD says this problem has been seen in some break-ins in south Charlotte

“We haven’t seen any activity like this, so we’re aware of that and the most important thing is making sure we have the best technology and the latest technology,” Shocknesse said.

WBTV asked him which devices are more susceptible to cellular interference

"I think it will work on some older wireless devices that don't have encryption," Shocknesse said.

Newer security systems and surveillance systems have better encryption and are more secure, he said.

“I really don’t think we can emphasize enough the importance of having cameras and some onboard video,” Shockness said. “The cameras we put in there are equipped with storage so if something goes wrong, you can still record what happened and report it to the police.”

To complement this advice, he said the best solution to prevent cell phone interference is to use current encryption technology and wired devices rather than WiFi.

To prevent break-ins, simple tricks such as maintaining good lighting, turning on alarm systems and trimming shrubs to a height of no more than one meter can be effective.

The Army electronic warfare cupboard bare no jammers until 2023

PENTAGON: The United States Army is straining to phone fund the increasingly important electronic warfare wifi capabilities it has developed since the gps fall of the Soviet Union. The Army possesses over 32,000 short-range defensive jammer device to block roadside explosives, but an offensive handheld jammer will not be available until 2023, according to current plans.

"Can that be sped up?" "Yes," replied Col. Jeffrey Church, the Army's Pentagon staff's chief of electronic warfare. "Technology exists today that does a lot of things that we would like MFEW [the Multi-Function Electronic Warfare system] to do," he said, adding that some of it might even phone be purchased commercially by the Army.

However, with the Army decreasing faster than any other service and sequestration looming, "there's no money tree," Church told me in an interview. "So if you're going to grow a robust electronic warfare program, who's going to pay for that?"

where is the Army's electronic warfare today?

"I have a theory. I've got folks. "I have facilities," Church explained. "What we lack is equipment."

"If you go to a unit gps today in the Army and phone you say, let me see your 'electronic warfare equipment,' and you go to the EWO (Electronic Warfare Officer) and he opens up his wall locker, it's empty," Church went on to explain. "Right now, the Army relies on borrowing assets from other people," such as the Growler aircraft from the Navy.

"Our senior army leaders have known and continue to know that electronic warfare is something the Army must have," said Church, the Army's senior electronic warfare specialist. (The fact that the highest senior EWO is a colonel rather than a general demonstrates how nascent the field is). "It's a matter of resource prioritization and wifi where do you fall in those priorities."

What category does electronic warfare fit under? The Pentagon's fiscal 2016 budget contains $2.5 million for something called the Electronic Warfare Planning & Management Tool, which is a rounding error for a significant weapons program. EWPMT, which went into service in September 2016, is much-needed software that will allow electronic warfare forces to gather data from sensors such as Navy Growlers and the Army's DCGS-A intelligence network.

"EWPMT is what allows them to see the phone battlefield in the electromagnetic environment," Church explained, "so you can tell your commander, 'this is where we have interference.'" This is the situation. This is where the adversary is. I'm not sure what it is, but gps I'm getting some sort of signal."

EWPMT, on the other hand, is now a command-and-control system with nothing to command and control. The 32,000 CREWS gps blocker that defend wifi Army vehicles from roadside explosives are strong at short range, but they aren't connected to any type of network, so EWPMT can't utilize them as a data source, much alone manage them. For the particular circumstances of Afghanistan and Iraq, the Army possesses just a few longer-range systems purchased using emergency funding and/or quick equipping authorities.

"We got good technology into wifi the field to save soldiers' lives," he remarked. "We didn't get any programs of record, so we phone don't have budgets, we don't have base dollars."

The Multi-Function Electronic Warfare system is designed to address this issue. MFEW will be a network of sensors and wifi blocker deployed on various sized drones, ground vehicles ranging from Humvees to heavy trucks, stationary locations, troops' backpacks, and maybe helicopters.

Church underlined that, unlike Cold War electronic warfare units, MFEW will not require a specialized vehicle to carry it: "The Army can't afford it," he stated, and current miniaturized electronics don't require it. Instead, MFEW will ride on ground vehicles while they go about their regular tasks, giving data to and receiving commands from Army electronic warfare experts at the gps command post. MFEW will be another plug-and-play module on drones, to be used or not depending on the task, as many specialized sensors already are.

How near is this vision to becoming a reality? "Right now, MFEW is not a program," Church explained, limiting the Army's capacity to support it. MFEW is now a "concept" in the arduous process of becoming a formal Army requirement. "We're on about the fifth rewrite of the MFEW CDD (Capabilities Development Document)," Church stated in a statement. MFEW can become a program of record and receive base budget money after thephone CDD is completed and authorized.

The MFEW is expected to start service in 2023 and achieve full operational capability (FOC) in 2027. We're still playing catch-up till then.

"Guys like the Russians, guys like the Chinese, their surrogates, they've spent the last 20 years continuing the development and acquisition of an electronic warfare capability, whereas… the Army got out of the business," he stated. When the battlefield was brought back to life, he stated, "Army electronic warfare started from nothing, and it started from nothing in a combat environment where a lot of US soldiers were being killed or wounded due to the radio-controlled IED."

Church stated, "Now we have to take this to the phone next level, and MFEW is the next level."

Of course, all of this is taking place as the Pentagon's senior leadership assesses its electronic warfare portfolio. The newly formed Electronic Warfare Programs Council is the place to be; it is led by Frank Kendall, the undersecretary for acquisition, technology, and logistics, and Adm. James Winnefeld, vice chairman of the Joint Chiefs of Staff.

How accurate is mobile tracking?

There are three ways to determine the location of your Tracki GPS tracker using geolocation data.

1. Global Positioning System (GPS) functionality, which uses satellite signal jammers to determine location very accurately.

2. Connect to WiFi by tracking the router’s MAC ID. If Tracki GPS Tracker cannot find a GPS signal, it listens to all nearby WiFi routers and reports their MAC ID to our servers, which have access to a map of wifi blocker routers and their locations around the world. Accuracy is approximately 100-300 feet.

3. A less precise method is often called "cell tower triangulation," which refers to how cell towers calculate a tracker's geophysical location.

What is Cell Tower Triangulation?

In a perfect world, the GPS tracker's signal would be picked up by three or more cell towers, allowing triangulation to function. If you know the distance to a place from each of three unique points, you may compute the approximate position of that location in respect to the three reference points. We know the locations of the cell towers that receive our jammer GSM signal at Tracki because we have access to mapping of all cellular tower locations worldwide, and we can estimate the distance of the GPS tracker from each of those antenna towers based on the lag time between when the tower sends a ping to Tracki GPS tracker and receives the answering ping back.

In rare situations, a GPS tracker's signal may be received by more than three cell towers, providing for even greater precision. Because there are frequently many cell towers with overlapping signal coverage regions in big metropolitan urban areas, GPS tracker pinpointing accuracy is pretty good. When the GPS tracker is not exposed to the open sky, such as when it is within a building or underground, and there are no Wi-Fi networks nearby, cell tower triangulation may be the only means to determine location if GPS signal is not accessible.

However, there are numerous areas with fewer cell towers available, such as on the outskirts of towns and in rural areas. When there are less than three cell towers accessible, locating a anti-tracking jammer device becomes significantly less precise. To have good coverage in cities with a lot more vertical structures that might be obstacles to GPS tracker transmitting and receiving, there must be a lot more cell towers spread. There are fewer cell towers in the countryside, and a GPS tracker's signal may be picked up by only one tower at a considerably longer distance.

Those places where the GPS tracker is only picked up by a single tower, and if it just has a single omnidirectional antenna, the accuracy is considerably worse.

Tracking accuracy in rural locations might range from 0.25 mile to several miles, depending on how many obstructions may be obstructing the tower's signal.

How does a GPS tracker work?

GPS, or global positioning system, uses 24 to 32 solar-powered satellites and ground stations to relay data to GPS-enabled devices.

The primary goal of GPS systems is to identify the exact location of an object or person in real time. The global navigation satellite system (GNSS) network is used by GPS tracking systems. Each satellite in orbit transmits microwave signals to a receiver. The GPS tracker's receiver then utilizes these signals to compute your precise location from at least four GPS satellites. Finally, your location is calculated when the system triangulates your actual position on the earth based on these distances to the closest meters.

The method is based on a basic mathematical idea known as trilateration. GPS receivers use the exact location of at least four satellites and the distance between them to estimate four values: earth latitude, earth longitude, elevation, and time. The position of the receiver is determined by the position and distances to a certain satellite. The precise position of a satellite is regularly sent to all receivers within line of sight, which normally necessitates an unobstructed sky. The precise moment the satellite broadcast arrives at the receiver determines the distance to a satellite. The time created by each satellite's atomic clock is relayed at predetermined intervals by the satellite.

What a GPS Tracking Device Is and How It Works

GPS tracking devices operate on the same concept, but instead of displaying information on the device, the gadget's CPU calculates its location and transmits the resulting data to a server over the Internet via the international GSM cellular network. That server offers a platform from which end users may monitor the device's present and historical path, speed, and alarms. All of this data is then delivered over the internet and shown on a desktop software or a smart phone jammer utilizing an iPhone or Android app.

Anyone may profit from a GPS tracking device. It may be used by company owners to monitor fleets, staff conduct, and by households to keep track of elderly, children, or pets. To prevent their luggage from being lost or stolen, travelers embed a GPS tracker in it.

Active trackers, on the other hand, use a SIM and a GSM transceiver to process and send data in real time. Dispatchers receive real-time information via the GSM cellular network, allowing them to keep a close eye on their assets or valuables. Cellular network services are paid for with monthly fees.

In the event that the GPS satellites signal is obstructed due to being indoors or by a structure, and there is no sky, the device looks for cell tower signals and attempts to determine rough position using cell tower signal strength triangulation.

The GPS tracker determine where the device is located and roughly estimate the distance between the cellphone towers by interpolating signals between adjacent towers. A precision of down to 300 feet may be obtained in urban areas where density of cellphone towers is very high. Rural and county side areas which has less towers per square mile may see many miles between base stations and therefore inaccurately determine locations often showing a location miles away from the device real location.

For conclusion, when GPS satellite signal is available that is preferable to use. But in those cases when a GPS tracking device is blocked from open sky by structures, tall buildings, trees or even heavy clouds, cell tower approximation can mean the difference between knowing a general area whereabouts of GPS tracker or being in a complete dark.

Signal interference defense not up to the task?

How criminals use jammers to compromise WiFi security cameras