Abstract: Systems and methods are disclosed that include measuring power within at least one part of a wireless frequency band. These systems and methods also include calculating a variance, a mean, and a mean-to-variance ratio based upon the power measured in at least one part of the wireless frequency band using a processor. In addition, these systems and methods include comparing the mean, variance, and mean-to-variance ratio to known thresholds and determining if jamming is present within the at least one part of the wireless frequency band.

Abstract: A filtering circuit with a jammer generator cancels a jammer in wireless signals with little degradation of the signal-to-noise ratio (SNR). The filtering circuit may include a jammer generator which acquires information of period and phase of a sinusoidal jammer signal in a composite input sinusoidal signal, which includes the jammer signal and a desired signal, and outputs a pseudo sine-wave with a period and phase corresponding with the period and phase of the jammer signal acquired, and an adder which outputs a difference between the input and output signals of the jammer generator as the desired signal.

Abstract: A wireless communication system for geographically controlling a communication area includes an access point for communicating with a terminal in a first area, and a jammer for generating noise for intercepting communication between the access point and a terminal in a second area. A jamming boundary for dividing an area in which the terminal can communicate with the access point and an area in which the terminal cannot communicate with the access point in an area in which the first area and the second area are overlapped is formed, and the jamming boundary is formed by a ratio between power of a signal transmitted to the terminal by the access point and power of a signal of the noise.

Abstract: A system and method for suppressing radio frequency (“RF”) transmissions includes a transmitter for transmitting electronic signals that suppresses (e.g., prevents, disrupts, jams, interferes with or otherwise disables) RF transmissions. Some embodiments of the invention include a transmitter that suppresses one or more signals transmitted from a target transmitter in an RF transmission system to a target receiver in a wireless device operating in the RF transmission system to prevent, disrupt, jam, interfere with or otherwise disable an RF transmission between the target transmitter and the target receiver in the wireless device (i.e., target wireless device). These systems and methods may be used to interrupt communication, command and control of non-friendly combatant. These systems and methods may also be used to suppress RF transmissions to prevent the detonation of improvised explosive devices, or IEDs.

Abstract: The present invention relates to a wireless communication system and, more particularly, to a spectrum sensing method in cognitive radio communication. According to an aspect of the present invention, a method of canceling an introduced transmission signal includes generating a first signal, having an inverse phase, using a data transmission signal transmitted by a data transmission unit, adjusting a path and/or an amplitude of the first signal, and generating a first signal, having an inverse phase, using a data transmission signal transmitted by a data transmission unit, adjusting a path and/or an amplitude of the first signal, and canceling a second signal, introduced through a data receiving unit, and the first signal by the data transmission signal.

Abstract: A method and system for disabling a wireless communication device, including: capturing a signal stream from the wireless communication device by satisfying a signal control protocol using a mobile broadcast antenna; and routing signals to and from the wireless communication device according to a non-standard protocol, thereby disabling normal operation of the wireless communication device. The mobile broadcast antenna includes a signal capturing module configured to receive information relevant to satisfaction of the signal control protocol and to alter a signal of the mobile broadcast antenna. The signal capturing module detects signal strengths from other broadcast antenna and alters a broadcast strength of the mobile broadcast antenna to be higher than the detected signal strengths.

Abstract: The VoIP Management System is capable of identifying voice-based wireless devices and denying wireless communication services to these devices. The VoIP Management System also identifies VoIP packet data traffic, and this communication connection can be denied. The VoIP Management System can also identify encrypted VoIP packet data traffic (for a unique Source -Destination IP pair) based upon VoIP packet data traffic characteristics: packet timing, packet rate, and packet size, since VoIP services have a distinct packet data traffic pattern. When a VoIP call is detected, the VoIP Management System disrupts the identified VoIP packet data traffic, without modifying the packet data content, such as by adding sufficient latency to the Packet Data Unit of the packet data traffic to make the VoIP services unusable.

Abstract: A device and method for estimating the operational effectiveness, status, and protection range of an electronic countermeasures system in real time or near real time are provided. The device and method calculate a predicted ECM power at a given location using a propagation and scenario model. Then a measured ECM power at the given location is used to determine a correction value equal to the difference between the calculated and measured ECM powers. The correction value and the propagation model are then used with a heuristic method to refine estimates of propagation and scenario parameters. The refined parameter set is used to produce a refined prediction of ECM power, which is used to create a refined correction factor. The refined correction factor is used to determine predicted ECM powers at a plurality of locations in an area around the device to determine a boundary of protection.

Abstract: A system includes a generator and at least one device. The generator includes a waveform oscillator and a blanking pulse generator. Each device includes a transmit antenna, a receive antenna, an antenna unit, a mixer and a detector. The antenna unit includes a receiver coupled to the receive antenna, an amplifier coupled to the receiver and a transmitter coupled to the transmit antenna and the blanking pulse generator. The mixer has inputs coupled to the amplifier and the waveform oscillator. The detector is coupled to the mixer.

Abstract: An airborne jammer for transport by an aircraft for jamming communications in a communications system where the communications system operates with digital bursts having burst periods measured in time and occurring in a communication frequency band such as GSM having a transmit band and a receive band. The jammer includes a tone comb generator for providing repetitions of jamming signals for the communication frequency band where the jamming signals have jamming signal intervals providing frequency separation between the jamming signals. The jamming signals are generated with a dwell time substantially less than a burst period for the communications system. The jamming signals are transmitted as RF jamming signals to jam communications for mobile stations.

Abstract: A network system comprises a first logic block providing a link to a first network via an access point of a WLAN and a second logic block communicating with a node of a second network (such as a WPAN) and configured to provide a link between the node and the first network via the access point. The network system is configured to maintain continuous connections to both the access point and the node while receiving power. The second logic block can communicate with the node using a modified communication protocol that is only partially compliant with an 802.11x communications protocol. A wireless hub can integrate a WPAN with a WLAN including, in part, a wireless circuit compliant with the WLAN standard (such as an 802.11x standard), a processor, and a memory. The wireless circuit can connect to the WPAN without losing connectivity (such as association and synchronization) to the WLAN.

Abstract: A method and system are presented for restricting the use of a portable electronic device by a driver who is operating a vehicle. A body area network (BAN) signal is sent from a vehicle device in the vehicle in close proximity to the driver. The BAN signal is transmitted using the driver's biological body as a signal transmission path. The portable electronic device includes a receiver configured to detect the BAN signal when the device is in close proximity to the driver. The portable electronic device is further configured to disable or restrict at least one function in response to detection of the BAN signal, thereby preventing or restricting use of the portable electronic device when the driver is seated in and operating the vehicle.

Abstract: A jamming system includes at least three jamming units. Each jamming unit is separately positionable and pointable. Each jamming unit covers different frequency bands. A method of using the jamming system includes moving a first jamming unit relative to a second jamming unit, and yawing a first jamming unit relative to an orientation of a third jamming unit.

Abstract: A method (300) and cognitive radio (CR) wireless device (102) are provided for dynamically accessing spectrum in an opportunistic spectrum access wireless communication system (100). The method includes: transmitting, from a CR wireless device, a signal (216) having a first bandwidth within an unoccupied portion of spectrum (206), and after a time interval (T3) following the transmitting, and upon determining that an adjacent spectral quantum is occupied, transmitting from the CR wireless device a signal (216) having a second bandwidth, the second bandwidth being less than the first bandwidth. The method doubles a rate of growth of bandwidth of a transmitted signal when a spectral quantum adjacent to one side of the signal is unoccupied and a spectral quantum adjacent to the other side of the signal is occupied. The method utilizes knowledge of location of the CR wireless device and of band-edges to intelligently use spectral fence quanta.

Abstract: Techniques for detecting wireless devices that are signaling in high proximity to a convoy or other operation and preventing messages from reaching the wireless devices. One class of the techniques uses surgical jamming methodologies that minimize power consumption and collateral interference, while being maximally inconspicuous; another class uses baiting beacons to prevent the messages from reaching the wireless devices. Still another class of techniques denies wireless devices access to a wireless network. An exemplary embodiment applies the techniques to wireless devices and beacons in a GSM network.

Abstract: A mobile phone detection and interruption system and method are provided. The system is operative to transmit different blocking signals capable of degrading or blocking mobile phone communication in a vehicle responsive to a velocity of the vehicle reaching different pre-configured velocity levels.

Abstract: A low-cost and power-saving system and methodology that reduces interference, unnecessary signaling and allows for more pertinent network listen measurements, by employing Bluetooth® technology in a femto access point (FAP) is provided. Moreover, a cellular transmitter in the FAP remains deactivated and is activated only if a UE, authorized for femtocell access, is within the femtocell coverage area. Bluetooth pairing is employed to identify authorized UEs within the femtocell coverage area. In an aspect, the FAP includes a Bluetooth modem that broadcasts a unique Bluetooth identity (ID) and facilitates Bluetooth pairing with nearby UEs. During the interval when the cellular transmitter is deactivated, the FAP performs background activities (e.g., network listen scanning and/or femto jamming of macro pilot). Additionally, a Bluetooth repeater is embedded within the FAP that extends the range of a Bluetooth-enabled device to the femtocell coverage area.

Abstract: Systems and methods provide for the selective prevention of data transfer from a medical device to allow the patient to have privacy when desired. These systems and methods provide medical devices that can be instructed to stop recording data and/or transmitting data to external devices and systems. These systems and methods also provide external repeater devices that can be instructed to stop recording data being received, stop forwarding data that is being or has already been received, and/or to stop soliciting data from the medical device. These systems and methods also provide for a blocking device that may be separate from the medical device and repeater to prevent data transfer such as by stopping the recording or transmission of data. The blocking device may be configured to provide a jamming signal to prevent data transmissions from being successfully communicated between the medical device and the repeater.

Abstract: An information processing terminal system includes an information processing terminal (6); and a transmitting and receiving unit (5) which is attached to the information processing terminal. The transmitting and receiving unit (5) converts a reception wave signal from a network into a reception analog baseband signal. The transmitting and receiving unit (5) converts the reception analog baseband signal into a reception digital baseband signal in synchronization with a clock. The information processing terminal (6) converts the reception digital baseband signal into a reception data in synchronization with a clock, and a transmission data into a transmission digital baseband signal in synchronization with the clock. The transmitting and receiving unit (5) converts the transmission digital baseband signal into a transmission analog baseband signal in synchronization with the clock.

Abstract: An apparatus operable to disable operation of wireless communications devices, for use within a vehicle, includes a drive circuit coupled to at least one active antenna element to produce interference within at least one wireless communications band of frequencies in response to the wireless communications device transmitting at a transmission power above a defined power threshold for a defined amount of time. The interference may take the form of a bare carrier wave, or may take the form of noise, and is transmitted at sufficient power to interfere with communication between the wireless communications device and a destination device.

Abstract: A jamming system includes at least three jamming units. Each jamming unit is separately positionable and pointable. Each jamming unit covers different frequency bands. A method of using the jamming system includes moving a first jamming unit relative to a second jamming unit, and yawing a first jamming unit relative to an orientation of a third jamming unit.

Abstract: An apparatus operable to disable operation of wireless communications devices, for use within a vehicle, includes a drive circuit coupled to at least one active antenna element to produce interference within at least one wireless communications band of frequencies in response to movement of a vehicle above a defined threshold. The drive circuit being selectively disabled while the vehicle is moving above the defined threshold. The interference may take the form of a bare carrier wave, or may take the form of noise, and is transmitted at sufficient power to interfere with communication between the wireless communications device and a destination device.

Abstract: The invention provides a radio frequency identification (RFID) tag. The RFID tag includes a receiving module, a judging module, and a jamming module. The judging module includes a first judging unit and a second judging unit. When a jamming function of the RFID tag is activated, the first judging unit judges whether a request signal received by the receiving module contains a reading command. If a judgment result of the judging module is positive, the second judging unit then judges whether an authorization code of the reading command is valid. If either the judgment result of the first judging unit or the second judging unit is negative, the judging module controls the jamming module to generate a radio frequency (RF) jamming signal.

Abstract: A device and method for estimating the operational effectiveness, status, and protection range of an electronic countermeasures system in real time or near real time are provided. The device and method calculate a predicted ECM power at a given location using a propagation and scenario model. Then a measured ECM power at the given location is used to determine a correction value equal to the difference between the calculated and measured ECM powers. The correction value and the propagation model are then used with a heuristic method to refine estimates of propagation and scenario parameters. The refined parameter set is used to produce a refined prediction of ECM power, which is used to create a refined correction factor. The refined correction factor is used to determine predicted ECM powers at a plurality of locations in an area around the device to determine a boundary of protection.

Abstract: Methods and apparatus for re-acquiring a WiMAX network after a relatively long power saving mode (e.g., sleep or idle mode) using a “pre-wakeup” scheme are provided. According to this pre-wakeup scheme, a mobile station (MS) may power up receiving circuitry to search for the current channel or, if unsuccessful, a neighbor channel. After a successful network search during sleep mode, the MS may return to sleep for the remainder of the sleep window until the circuitry is powered up a second time to wakeup and then listen for an expected message. By pre-waking up and searching before waking up for the expected message, the MS may counteract the effects of the potential error in the local oscillator frequency accumulated during the long sleep mode. In this manner, the message miss rate may be reduced, thereby saving power and extending the time in which the MS may operate between battery rechargings.

Abstract: An apparatus includes a voltage generator and a superstructure. The voltage generator includes a conductive base, an insulating spacer and a conductive top. The superstructure includes a platform and an antenna system. The voltage generator provides a voltage difference between the conductive base and the conductive top that is greater than 10,000 volts.

Abstract: Devices and methods of preventing data transfer between an RFID reader and an RFID device to be protected, are provided. An example of an embodiment of an RFID signal capture device includes a container, a signal capture circuit configured to substantially disrupt the signal provided by the RFID reader when the RFID signal capture device is positioned to protect the RFID device, and an interrogation indictor configured to indicate to a user of the RFID device that an unauthorized RFID reader is attempting to interrogate the RFID device when the RFID signal capture device is positioned in close proximity to the RFID device to provide protection thereto and when the RFID reader is producing the interrogation signal.

Abstract: In a first step, it is proposed that tunable transmitters and detectors (receivers) be included in a detection system and that a narrowband, preferably variable frequency signal be used in order to determine the frequencies for optimum injection into the electronics of a target. When the detection system identifies these frequencies, destruction can be initiated in the second step of the invention for a transmitter or receiver which is communicating with the target. For this purpose, once the optimum frequencies have been determined, a high-power signal is transmitted into the local area of the target at the specific/determined frequency. The evaluation unit, which is integrated in the detection system, controls the transmission frequencies, evaluates the harmonic signals, selects the optimum frequencies for an attack, and controls and checks the attack process.

Abstract: A method and system for disabling a wireless communication device, including: capturing a signal stream from the wireless communication device by satisfying a signal control protocol using a mobile broadcast antenna; and routing signals to and from the wireless communication device according to a non-standard protocol, thereby disabling normal operation of the wireless communication device. The mobile broadcast antenna includes a signal capturing module configured to receive information relevant to satisfaction of the signal control protocol and to alter a signal of the mobile broadcast antenna. The signal capturing module detects signal strengths from other broadcast antenna and alters a broadcast strength of the mobile broadcast antenna to be higher than the detected signal strengths.

Abstract: A method and apparatus for attacking a plurality of dispersed targets are herein presented. In particular, the method and apparatus herein presented allow the user to upload target data onto a pod mounted on a host aircraft. Upon reaching the pre loaded target location, the pod releases a plurality of individually targeted Micro Air Vehicles (MAVs), thereby allowing the user to attack a plurality of dispersed targets from a single aircraft standing off at a significant distance from the target area.

Abstract: Methods and systems for identifying mobile communication terminals that are used in an unauthorized manner in a restricted environment. A monitoring system monitors mobile communication terminals that operate in the vicinity of a restricted environment, such as a prison. A profiling system analyzes the communication of the solicited terminals, and produces respective activity profiles of the terminals. Based on the activity profiles, the profiling system identifies communication terminals that are operated illegitimately. Various actions can be taken with respect to such illegitimate terminals. In a prison application, the profiling system identifies communication terminals that are operated illegitimately by prisoners.

Abstract: Systems and methods are provided for projecting a virtual image of an object. A projector mounted on the object for projecting a light beam. A photographic plate is provided that includes an interference pattern imprinted onto at least one surface, wherein the interference pattern manipulates the light to form a hologram beam such that a detector detecting the hologram beam detects a virtual image of the object that has a light signature at a greater intensity than a light signature of the object.

Abstract: An RF signal processing device which includes a countermeasure set connected to the processing device. The RF signal processing device shifts an incoming RF signal by ninety degrees and combines the phase shifted RF signal with RF jamming signals from a jammer. The processing device next transmits the RF signal including the RF jamming signals from the jammer.

Abstract: According to one embodiment, a radio has a memory for the storage of a number of records. Each record has a number of operating parameters that are used by a controller subsystem to control the radio's operation. The controller subsystem is operable to communicate with a first communication device using a first electro-magnetic signal while communicating with a second communication device using a second electro-magnetic signal configured according to one of the records. The first electro-magnetic signal uses a portion of the information transfer capacity of the radio and is devoid of a counter-intelligence signal. The second electro-magnetic signal comprises a counter-intelligence signal that is operable to eavesdrop or disrupt communication of the second communication device.

Abstract: The invention concerns a scrambling electronic device adapted to be magnetically coupled with an inductive element (L3) of a contact-free external communication station (LEC). The scrambling device comprises active scrambling means (DB) adapted, in response to the magnetic field radiated by the external communication station (LEC), to generate a charge modulation capable of causing a collision with the charge modulation generated by the contact-free electronic device (CSC) when the latter is arranged relative to said scrambling electronic device in accordance with a selected relationship, said resulting collision disabling data exchange between the contact-free external communication station (LEC) and the contact-free electronic device (CSC).

Abstract: Precision surgical jamming of a target located at a distance uses GPS to coherently focus the jamming energy transmitted from a plurality of nodes. One of the nodes is designated as a master node and the remaining nodes are designated as auxiliary nodes. Each node tracks the carrier phases of satellite signals transmitted by a plurality of GPS satellites relative to a carrier phase of a reference oscillator in the respective node. The master node provides the tracked phase measurements along with its position information to all of the auxiliary nodes. The auxiliary nodes determine the phase offset of its reference oscillator relative to the reference oscillator of the master node based on the transmitted data. The transmit phase of a jammer transmitter in each of the nodes is then aligned to the phase of the reference oscillator to transmit a coherent focused beam to a distant target.

Abstract: A crisis response system including a throw module and a command unit connected by a communication cable. The throw module includes at least one covert video camera hidden from view. The covert video camera provides a video signal to the command unit showing the current conditions that exist in the immediate area surrounding the throw module. The throw module further includes a covert microphone hidden within the throw module that transmits an audio signal including the sounds occurring the immediate vicinity of the throw module. The crisis response system includes a cellular phone jamming circuit contained within the throw module that is selectively activated by a switch contained on the command unit. The cellular phone jamming circuit prevents cellular communication within a prescribed radius surrounding the throw phone.

Abstract: The invention refers to a method for a screening device and a screening device (1), for a cellular communication system comprising a user equipment, UE, (UE) in a cellular network The invention is characterized in the screening device (1) is arranged to generate a pulsed first signal (S1) being matched to screen a control channel (S, F, B) in a second signal (S2) generated in the cellular network.

Abstract: A system for impeding reception of confidential information is disclosed. The system comprises a point-of-sale transceiver configured to receive confidential information transmitted by a mobile device incorporating an electronic wallet and a signal generator in communication with the point-of-sale transceiver and configured to broadcast a jamming signal substantially concurrently with the point-of-sale transceiver receiving the confidential information.

Abstract: A method and apparatus for suppressing a transmit leakage signal of a radio frequency identification (RFID) reader is provided. The apparatus includes: a first power distributor distributing a transmission signal to output a first transmission signal and a second transmission signal; a second power distributor distributing the second transmission signal to output a third transmission signal and a fourth transmission signal; a first amplitude/phase converter converting an amplitude and a phase of the first transmission signal to generate a first converted signal; a second amplitude/phase converter converting an amplitude and a phase of the third transmission signal to generate a second converted signal; a first power combiner combining the first converted signal with a first leakage signal generated in association with the fourth transmission signal; and a second power combiner combining the second converted signal with a second leakage signal generated in association with the fourth transmission signal.

Abstract: A system and method are provided for transmitting a broadband interference signal and allowing communication through the transmitted interference signal. The system includes an interference transmitter for transmitting the interference signal, the interference transmitter having a transmitter feeder and a first antenna; a radio receiver for receiving a radio signal, the radio receiver having a radio feeder and a second antenna collocated with the first antenna of the interference transmitter; a steering signal generator for introducing at least one steering signal into the interference signal at the transmit feeder; a first directional coupler for sampling a portion of the interference signal that includes at least one of the steering signals; a negative feedback loop for adjusting the amplitude and phase of the sampled portion of the interference signal; and a second directional coupler for coupling the adjusted sampled portion of the interference signal into the radio feeder.

Abstract: A vehicle wireless communications blocker may be used in a vehicle for an occupant's wireless communications device and may include a long-range and short-range wireless transceiver both coupled to a controller. The controller may be switchable between off-hook and on-hook states based upon control signals via the short-range wireless transceiver, and the occupant's wireless communications device may be blocked from occupant communication via the long-range transceiver when in the off-hook state.

Abstract: A system includes a radio frequency transceiver. A baseband processor includes an automatic gain control module. The automatic gain control module has a gain that changes from and subsequently returns to a predetermined value each time the radio frequency transceiver receives a radio frequency signal. The baseband processor is configured to selectively generate an interrupt signal each time a radio frequency signal is received based on a magnitude of the change in the gain of the automatic gain control module and a length of time in which the gain returns to the predetermined value. A control module is configured to identify a radio frequency signal received by the radio frequency transceiver as a radar signal in response to the baseband processor having generated a plurality of interrupt signals at substantially equal time intervals.

Abstract: Systems and methods provide for the selective prevention of data transfer from a medical device to allow the patient to have privacy when desired. These systems and methods provide medical devices that can be instructed in various ways to stop recording data and/or transmitting data to external devices and systems. These systems and methods also provide external repeater devices that can also be instructed in various ways to stop recording data being received, stop forwarding data that is being or has already been received, and/or to stop soliciting data from the medical device. These systems and methods also provide for a blocking device that may be separate from the medical device and repeater to provide instruction to the medical device and/or repeater to prevent data transfer such as by stopping the recording or transmission of data.

Abstract: An airborne jammer for transport by an aircraft for jamming communications in a communications system where the communications system operates with digital bursts having burst periods measured in time and occurring in a communication frequency band such as GSM having a transmit band and a receive band. The jammer includes a tone comb generator for providing repetitions of jamming signals for the communication frequency band where the jamming signals have jamming signal intervals providing frequency separation between the jamming signals. The jamming signals are generated with a dwell time substantially less than a burst period for the communications system. The jamming signals are transmitted as RF jamming signals to jam communications for mobile stations.

Abstract: A Radio Frequency based security system for providing security for wireless Local Area Networks (WLAN) that allows the creation and maintenance of arbitrarily shaped secure wireless access areas with boundaries around said wireless Local Area Network and prevents access to the said wireless LAN from outside the perimeter of the secure area. The system includes a plurality of perimeter Radio Frequency Sentry Devices (RFSDs) that are employed to establish the boundaries of said secure area around said wireless LAN. The wireless LAN being secured may be an industry standard IEEE 802.11a, 801.11b or 802.11g based wireless LAN or any other wireless LAN that uses packet based communication protocols. The said RFSDs may be stand-alone devices or they may be connected to a wired or wireless Local Area Network.

Abstract: Wireless telecommunications is inhibited within a limited region by generating a noise signal within a frequency range of the wireless telecommunications and broadcasting the noise signal into the limited region. A system for inhibiting wireless communications includes a radio frequency noise generator generating a noise signal within a frequency range of the wireless telecommunication. At least one antenna broadcasts the noise signal into the region. Control logic initiates or suspends broadcasting of the noise signal based on at least one control input.

Abstract: A multiband heterodyne receiver, and method, having a source of a received signal, a local oscillator that outputs a local oscillator signal, and a mixer that combines the received signal and the local oscillator signal to generate a combined signal. The local oscillator signal can be adjusted in accordance with a detected jamming signal. A DC filter receives the combined signal and attenuates a DC component of the combined signal so as to output a DC filtered signal, and an analog-to-digital converter receives the DC filtered signal and converts the DC filtered signal to a digital signal.

Abstract: A method and system of disabling a remote improvised explosive device (IED) that is triggered by a cell phone. A portable wideband network system, installed in a vehicle, is used to determine operator frequency or frequencies active on a route along which the vehicle will travel. The vehicle includes a wideband transmitter for raising a radio frequency noise floor across all of the active cellular frequencies in a limited area surrounding the portable wideband network system during passage along the route. A notch filter is used by the system for filtering a particular frequency from the noise floor. The power level of the portable wideband network system is increased so that the strongest signal at the particular frequency in the limited area is provided by the portable system's base station. All mobile terminals in the limited area around the vehicle are connected to the portable system and the portable system prevents call completion of any of the connected mobile terminals.

Abstract: In various areas of application, it is desirable to have a jamming apparatus for jamming radio signals which is greatly limited in geographical terms and ensures reliable jamming of the radio signals. The present application solves this problem by providing a jamming apparatus which comprises: at least one detection device for detecting a target signal which is transmitted to at least one communication device; at least one jamming device for jamming the target signal by means of a jamming signal; a control device which is communicatively connected to the jamming device for the purpose of controlling it; wherein the control device for controlling the at least one jamming device receives at least one input signal for determining a transmission power of the jamming device and/or a communication device. Therefore, a central idea behind the present invention is to regulate the jamming signal in a dynamic manner. Efficient jamming of the device which transmits the target signal can thus be ensured.