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GIDAS’s real-time interference detection makes the navigation system safer

It is estimated that there are currently the same number of navigation receivers on Earth as humans. Positions, navigation and time signals from space-based constellations such as Galileo and GPS form an invisible, indispensable infrastructure that lays the foundation for many modern aspects of modern life (communication, energy, and transportation).

Satellite navigation is helping to control more and more planes, ships, trains and self-driving cars. At the same time, navigation-based time stamps can mark real financial transactions worth billions of euros and coordinate the synchronization of the grid. Satellite navigation is always active and available anywhere on the planet. Therefore, it is easy to take usability for granted. These signals from space are equally important, and they are also susceptible to ground interference.

Andreas Lesch of OHB Digital Solutions in Austria said: “It’s just a matter of output power.” “The navigation signal on the ground corresponds to the light of the 60-watt lamp on the satellite. For Galileo, its distance in space is about 23,222 kilometers. These weaker signals may be accidentally or deliberately destroyed by stronger local radio signals or even misleading false navigation signals (so-called deception).”

“We have developed a new GNSS interference detection and analysis system, GIDAS, to protect critical infrastructure from damage or deception by continuously monitoring important signal frequency bands. In this way, GIDAS can trigger alarms in real time, determine the nature of the failure, and then determine the cause of the failure. The location of those dangerous portable devices so that the authorities can take immediate remedial measures.”

Although at least three stations are required to locate interference sources connected to the entire monitoring center, GIDAS can provide interference detection and orientation through a single reporting station. Monitoring centers can also be connected to each other, which makes the GIDAS system easy to expand, from ensuring a single port, airport or key location of the system to the entire city or region.

Although at least three stations are required to locate the interference source connected to the entire monitoring center, GIDAS can provide interference detection and orientation through a single reporting station. (Photo: ESA)

“People are only catching up with the severity of this problem now,” Andreas added. “In parts of Europe, the highest density surveys show about three to four signal jammers per hour.

These small devices are technically illegal, but can be purchased online for a few hundred dollars or less, and are usually sold as data protection devices. The sales range of the jammer is only a few meters, but the actual use range may reach tens of meters or more, which may cause unnecessary widespread interference. For example, the famous American truck driver takes the jammer while sailing at Newark Airport as long as he passes. Will shut down the system.

Raspberry Pi 4 HDMI is interfering with its own WiFi

Upgrading a popular line of products may sound like a good idea, but adding bigger / better / faster parts to an existing product can lead to unforeseen problems. For example, putting a more powerful motor in an existing vehicle platform seems to work at first until people report that the increased torque is bending the frame. In the Raspberry Pi world it seems that the “updated engine” in the Pi 4 causes the WiFi to stop working under certain circumstances.

Enrico Zini noticed this problem and tried to reproduce exactly what caused the WiFi to fail. After testing various Pi 4 cards, power supplies, operating system versions, and a host of other variables, the cause was isolated on the screen resolution. Apparently the WLAN fails with the setting 2560 × 1440 with HDMI. While you might think that a SoC might not be able to handle high resolution, WiFi, and everything else that tiny computer has to do all at once. However, the root cause seems a little more interesting than a simple problem with system resources.

Mike Walters checked for a radio frequency problem with a HackRF on a Twitter post on this issue. It turns out that at this screen resolution, the Pi 4 emits RF noise that is exactly in the range of WiFi channel 1. It appears that the Pi 4 is acting as a wifi jammer for itself.

This story is pretty new, so hopefully the Raspberry Pi Foundation is aware of the problem and is working on a fix. For now, however, it might be best to use a slightly lower resolution if you encounter this problem.

High quality drone jammers for military applications

Jammer-mart specializes in the production and sale of high quality signal jammers and offers a wide range of jammers for military applications.

Jammers for drones include portable models, desktop models, suitcases, briefcases and models for various purposes.

Other models include bomb jammers designed to protect vehicles from improvised explosive devices (IEDs), prison jammer to protect the area, remote jammers to remove remote controlled devices, and a range of Wi-Fi mobile devices and systems (GSM) jammers for addressing of radio and GSM signals.

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Drones disrupt the remote control and GPS signals

Jammer-mart offers a special range of jammers with which the remote control (RC) of an unmanned drone / quadrocopter for aircraft (UAV) or its GPS signal (Global Positioning System) can be disrupted.

Most commercial 3km to 5km high-end UAV drones / quad copters only use 2.4GHz Wi-Fi and GPS L1. All other drones with 5.8 GHz, 433 MHz, 928 MHz can control a maximum length between 500 m and 1,000 m.

We offer devices with proven radio technology and guarantee reliable operation and stability.

Remote controlled jammers series

Jammer-mart is developing a special series of jammers designed to restrict RC signals from various devices including RC cars, boats and toys, as well as quadcopters, alarms and wireless sensors.

Jail jammer for military locations

Prison Jammers are intended for prisons and other large sensitive locations such as military or government buildings. They can also be used in military units, security and intelligence services, oil and gas storage facilities and fields, and in museums.

The jammers can be used to block occupant phone communication if necessary.

Portable briefcase jammers for RC bomb protection

The Portable Briefcase with Radio Controlled Improvised Explosive Device is a portable broadband jamming system that protects VIPs and citizens from radio controlled improvised explosions by deactivating radio signals to control exploders in dangerous areas.

Briefcase jammers emit radio frequency (RF) interference, creating an “RF protected zone” around the object (or a group of objects in that zone) that allows radio-frequency remote activation of bombs (activation of cells / mobiles, radios, and others various radio devices) in the vicinity with a sufficient anti-trap safety radius to save lives and avoid serious injuries.

Vehicle and briefcase jammers also guard police and government offices, security forces, dignitaries and VIPs, checkpoint and border crossings, roadblocks and embassies.

Jammers are available in different models depending on frequency and output power, but can also be customized to meet user requirements.

GPS tracking and location of jammers

The GPS signal jammer models are designed to cover GPS tapes and other tracking and positioning devices to provide an effective combat solution that goes undetected by GPS trackers and Wi-Fi Android tracking devices.

About wretched world

Jammer-mart focuses on the market needs and security trends and then develops drone jammers to meet the growing demands of the security market such as the rapidly growing UAV market.

We supply an extensive selection for every possible application.

Signal jammers can sometimes prevent tragic events

The use of cell phones is an explosive risk in gas stations. Turn off your cell phone while filling your car. There are usually warnings at petrol stations about banning the use of a cell phone. While in many countries, cell phone signal blocker has been a good choice for stopping the phone call at gas stations. Buying a trendy, modern cell phone signal blocking kit is the latest tip for cell phone and gas station users, who recently advised all of its affiliates to be mindful of who pays the bill. gas. cause explosions. Come here professional online GPS jammer store www.jammer-mart.com and pick up strong signal jammer to avoid unnecessary dangerous occasions, you will need it at your gas stations. You know that there have been several explosions because of the telephone used in gas stations. You can stop the miserable spell with the phone signal jammer right now.

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According to reports, a driver in Indonesia was burned and his car was severely damaged when gasoline vapor exploded after being ignited by static electricity from the cell phone he was using. It’s so terrible. It is very necessary to install high power cell phone blocker to protect you from danger. The threat that mobile phones pose to gas stations and their users around the world is largely due to their ability to generate sparks. To stop the sparks, our stone has produced many jammers for your picking. Some people, especially teenagers, easily fall in love with a cell phone for these reasons when in the gas station, as they have no idea of the hidden threat and can easily overlook the warning.

Now it is your mission to best buy mobile phone signal blocker to prevent miserable things from happening. What will you do, then? Go get one now!

Blockage with jammers

A jamming transmitter sends a random signal (noise or pulses) with the greatest possible strength at a certain frequency and thus superimposes the original transmission. If jammers are used specifically, they are referred to as strategic jammer. These devices are also known as jammers and the process is known as noise jamming.

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Jammers are available for various radio protocols such as Bluetooth, WiFi, GSM, UMTS, LTE and GPS. Whereby the specific frequency of the radio protocols is disturbed. There are very simple and small devices that can only interfere with radio signals within a limited radius. For example, there is a small adapter for the car cigarette lighter with the function of interfering with the GPS signal. Portable devices with an integrated battery have a range of up to 20 meters under optimal conditions, depending on the version. Usually they can interfere with the signals in a room. Powerful stationary devices can have a range of up to 80 meters.

The use of jammers is illegal in Germany. They are primarily used by investigative authorities and the military services. Some of them are used in prisons to prevent illegal communication from prisoners. The challenge here is that no signals from outside are blocked, for example the cell phone signal to call the emergency call. Abroad, jammers are sometimes used in cinemas and theaters so that the events are not interrupted by a cell phone signal. Another use is, for example, the blocking of control signals from drones.

If such a jamming transmitter is used by attackers, it can be used, for example, to block the radio connections of surveillance cameras or window sensors of alarm systems. Therefore, interrupted connections must always be equated with an alarm. In addition, jammers can be detected by continuously testing a radio connection between two components with a cable connection. If the connection is interrupted, a jammer is active. Alternatively, but also more difficult to solve technically, the signal level, the strength of the radio signals, can be tested. If a new strong source is detected here, it could be a jamming transmitter.

Why the actual working range of jammers is different

Here we are going to talk about the scope of work of whining, which is one of the most controversial equipment issues on the Internet and is the concern of most of the customers.

We know that every storage device has a different restricted area, which has already been mentioned. In general, the higher the force, the longer the stagnation radius. And the higher the force, the bigger the size of the WiFi jammer, and they also need a cooling system. For this reason, desktop jammers generally have a wider range of interference than portable jammers. So before you buy a jammer, you need to determine the type of whine you will need and the storage area you want. Both should be considered, then you can get what you want.

desktop mobile phone blocker

In the introduction of each interferer, we emphasized that the interference range of the jammer is only used as a reference, please anticipate the current situation. Jamming range depends on the local signal strength. Here we will try to explain why the manufacturer’s workspace often differs from the actual fact.

At the beginning, when the woe is made, it is tested. There are many necessary tests, such as battery life, transmission frequency, etc., including test congestion radius. The manufacturer always thinks that the test results are more effective than the actual range, as these devices are often tested in empty fields. They know that buildings and various concrete structures can impede the transmission of signals. And most of us live in big cities, we are surrounded by skyscrapers. While the local cell phone signal strength is also a factor of the impact. So don’t be surprised if your clogged device can’t block the phone within 30 meters of you.

Of course, you don’t have to worry about the woes that don’t suit your needs. There are many different types of signal jammers here. You can get what you want according to your situation. Like a general portable jammer, they have a very decent work area, especially if your main goal is to stop people around. I think they got to 5 meters which is enough, especially now that you are on the bus you want people to stop for a minute or two. Such a device will definitely help you.

Detailed introduction of mobile communication jammer

KZXJ-1D communication signal intelligent monitoring and cutting equipment is a series of electromagnetic interference products of Chengdu Anze’s national distributor, which can effectively shield CDMA, GSM, DCS, PHS, TD-SCDMA, WCDMA, CDMA2000, FDD-LTE in a certain place , TD-LTE, WIFI mobile phone signal and Bluetooth communication.

The mobile phone signal jammer adopts advanced shielding technology with completely own intellectual property rights, which shields the downlink signal of the base station within a certain range, so that any mobile phone (including 2G, 3G, 4G, WIFI) in the location fails to send and receive functions and cannot make calls. And answering calls, unable to receive/send text messages, and unable to access the Internet, so as to achieve the purpose of forcibly banning mobile phones. The mobile communication jammer has the characteristics of low radiation intensity, large interference radius and no interference to mobile phone base stations, stable performance, convenient installation, and harmless to the human body. It is an ideal product for purifying the mobile communication environment in specific places.

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The main function

1. It can quickly find the communication signal in the restricted area and have a signal alarm display;

2. It can block and cut calls, text messages, Bluetooth communication and wireless Internet access in the restricted area in real time;

3. It can detect the bug in this working frequency band and prevent it from working;

4. It can prevent the explosion of remote control bombs in this working frequency band;

5. It is convenient to set the attenuation of the received signal strength according to the requirements of the scope of use;

6. The decision threshold can be flexibly set according to the electromagnetic environment of the use area to ensure that no missed or wrong judgments are made;

7. The set judgment threshold and various values have memory function, if the environment does not change, it can be used permanently, once there is a change, it can be reset flexibly; the device will automatically scan the local level when it is turned on.

8. The system has a complete self-check function, which is convenient for finding and finding faults.

Military heavy ground needs UAV countermeasure system defense

With the development of science and technology, drones have become more and more common. They are not only used in the military, but also in civilians. Moreover, drones are widely used. They have night-time camera functions and can quietly disappear at night. Flight at various places. People can use it to take pictures, to video, to explore, to peep, etc. It depends on what kind of behavior the drone owner will have. If it is a military powerhouse, drone countermeasures systems are needed for defense.

Since drones are more common and common, if a military site is peeped or attacked by drones, it will bring serious consequences. Because the drone has an intelligent form, it can also be controlled. As long as the operator connects to the computer, he can see everything the drone sees through the computer, and some can also launch an attack. There are many military secrets in military powerhouses. Once snooped by drones, it often leads to the leakage of military secrets.

If there is a drone jammer in a military powerhouse, once the UAV enters, the surveillance system can be used for monitoring and the UAV can also be landed. Destroying devices can also be used, but generally as long as the drone is knocked down, it can be studied through the drone to know the main messenger behind the scenes.

Common questions and answers about signal interference

Can someone send me a text message when the phone is blocked?

After the mobile phone is blocked, the text messages sent by others will not be received, nor will it be possible to make and receive calls. After unblocking, that is, the cell phone jammer is turned off or you leave the area where the phone signal jammer works. If it is a text message sent to you by someone else on the same day, you will receive it. If it is earlier, such as yesterday or earlier, this It depends on whether the SMS service of your mobile communication service provider has this function.

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Similarly, if you are blocked by your mobile phone, after someone dials your call, if your mobile phone is activated with Caller or similar services, after the signal is restored, you will receive a short message reminder of missed calls.

Can smartphones be immune to the influence of mobile phone jammers?

There is no way. The unshielded cell phone has nothing to do with whether the cell phone is smart or not.
The frequency of GSM mobile phone is 900MHz/1800MHz, CDMA is 800MHz, PHS is 1900MHz, mobile phone signal jammer usually shields the frequency interference of these four frequency bands, if you have a way to keep the phone out of this frequency, you can I don’t like jammer interference, so there is no way, because if the mobile phone is not within this frequency range, it is not a mobile phone (including PHS).

Does the jammer consume a lot of mobile phone batteries?

Mobile phone jammers consume a lot of battery for most mobile phones. Since the mobile phone jammer is turned on, the signal between the mobile phone and the base station will be shielded. Actually, it is interfered and cannot form normal communication with the base station. Then, many mobile phones have this function: when there is no signal, the mobile phone must be very Efforts to search for the signal, which leads to a lot more power consumption than the normal standby state!

How far is the most suitable shielding range of a mobile phone signal jammer?

The shielding distance of the device has a great relationship with the power of the device and the use environment, and several aspects that are helpful to the shielding effect: one is the output power of the device, the other is the working method of the shield, and the third is the use environment (indoor or outdoor). The fourth is to shield the interference intensity of the surrounding environment.

Nowadays, mobile phones are all digital signals, and the anti-interference ability of digital signals is very strong. Generally, the effect of using analog signal technology to interfere with digital signals is poor. Therefore, digital signals must be used to interfere with digital signals. The interference effect is quite different. The signal jammer using digital jamming signal technology has lower power and higher efficiency than the jammer using analog signal jamming technology.

desktop mobile phone blocker

The synthesis, attenuation, and reflection analysis of indoor mobile phone signals and interference signals is very complicated. Before shielding, the strength and quality of local cell phone signals have a great impact on shielding. Different mobile phones have different effects. Generally, mobile phones with strong ability to receive weak signals may not have good anti-interference effects.

The direction of the base station and the direction of the shielded area of the mobile phone also affect the shielding effect. Generally, the spatial signal strength is about -60 to -70dbm, and the base station can reach about -40dbm within a few hundred meters, and the mobile phone reception strength range is generally between -35 to -95dbm. The higher the signal power of the space mobile phone, the shorter the shielding distance.

The above conclusions are based on the law of radio signal transmission in free space. In reality, there are many obstacles on the ground that affect the transmission of radio waves. The above can only be qualitatively used as a reference, especially indoors. The above law is very different from the actual situation. Therefore, this problem is difficult to calculate accurately at the time, and can only be determined based on the actual situation on site. Precise construction projects must carry out preliminary research and signal testing, and then design specific solutions. In the later period, timely follow-up tests are required, and certain corresponding supplements can be foolproof, that is, to achieve the effect of strict shielding.