Method and system for providing at least one signal and a test and measurement system for robustness testing of a signal receiver

Abstract

A method for providing at least one signal, in particular a superimposed test signal, comprising the steps of collecting information including at least a scrambling code and / or a spreading code of at least one signal transmitter and transmitting at least a first signal during a first preconfigured time slot, wherein the first signal uses the same scrambling code and / or spreading code as the first signal transmitter and wherein the first signal has pseudo noise as a payload. Furthermore, a system for providing at least one signal and a test and measurement system for testing the robustness of a signal receiver are described.

Description

Technical Field

[0001] The invention relates to a method and a system for providing at least one signal. Furthermore, the invention relates to a test and measurement system for testing the robustness of a signal receiver. Background Art

[0002] In the past, aerial drones (e.g., privately controlled drones) have become a growing problem for airports as they can disrupt airport operations. Aerial drones can infiltrate the airspace and endanger aircraft during landing and / or takeoff.

[0003] Furthermore, the use of those aerial drones in other public places is also prohibited for safety reasons. For example, it is not permitted to operate aerial drones in the airspace allocated for spectators of open-air concerts, festivals, etc.

[0004] Typically, aerial drones are controlled by radio signals received from a radio transmitter that emits the corresponding radio signals. However, modern aerial drones can also be controlled by Global Navigation Satellite System (GNSS) signals, for example, signals involving the Global Positioning System (GPS) or the European equivalent known as Galileo. Other GNSS signals involve the Russian Global Navigation Satellite System (GLONASS) and the Chinese system known as BeiDou.

[0005] In any case, a modern aerial drone corresponds to a signal receiver for a corresponding signal emitted by at least one signal transmitter of a corresponding type (e.g. a GNSS signal transmitter, such as a satellite).

[0006] As mentioned above, operating aerial drones is restricted, and therefore, it may be important to prevent the operation of these aerial drones in certain areas. Typically, this is accomplished by jamming the corresponding GNSS signal with a relatively high-power chirp signal used to superimpose the GNSS signal, causing the corresponding signal receiver (i.e., the aerial drone) to receive the jamming signal.

[0007] Since systems for jamming GNSS signals require a lot of power and therefore infrastructure to provide the necessary power, the concept can be used in fixed areas such as airports. However, open air concerts or other public events such as festivals may take place in locations that do not have the infrastructure necessary to operate the systems known in the prior art.

[0008] Furthermore, in addition to devices that are not allowed to operate in certain areas (such as third-party aerial drones), however, other devices that use the same type of signals (e.g. GNSS signals) should also be operated. Therefore, it is also important that those devices are robust to interference.

[0009] Therefore, the devices allowed to operate in the corresponding area are usually pre-tested with respect to their robustness against interference signals by means of test and measurement systems. Usually, these test and measurement systems provide at least one signal, in particular a desired signal and a test signal superimposed with the desired signal, in order to check how robust the corresponding device is against interference.

[0010] Therefore, there is a need for a method and system that ensures that only permitted devices operate in a particular area in an efficient manner while using less power. Summary of the invention

[0011] The present invention provides a method for providing at least one signal, in particular a superimposed test signal, comprising the following steps:

[0012] - collecting information including at least one scrambling code and / or spreading code of at least one signal transmitter; and

[0013] - transmitting at least a first signal during a first preconfigured time slot, wherein the first signal uses the same scrambling code and / or spreading code as the first signal transmitter, and wherein the first signal has pseudo noise as payload.

[0014] In addition, the present invention provides a system for providing at least one signal, the system comprising a waveform processor and at least one antenna assigned to the waveform processor. The waveform processor is configured to create at least one signal to be transmitted by means of at least one antenna during an assigned preconfigured time slot based on the collected information. The information includes at least one scrambling code and / or spreading code of at least one signal transmitter. The waveform processor is configured to create at least one signal to be transmitted so that the at least one signal uses the same scrambling code and / or spreading code as the corresponding signal transmitter. The waveform processor is configured to create a signal so that the signal has pseudo noise as a payload.

[0015] The present invention is based on the following definition: the first signal corresponds to the signal transmitted by the corresponding signal transmitter, because the corresponding signal has the same scrambling code and / or spreading code as the signal transmitted by the first signal transmitter. In other words, the signal is created according to the standard of the corresponding signal transmitter while using the same scrambling code and / or spreading code. However, the payload of the signal is pseudo-noise, so that no (useful) information is transmitted by the first signal. This means that since the first signal only provides pseudo-noise (content), the first signal neither transmits correct information nor any false information.

[0016] The signal may be used to perturb communications between a corresponding signal transmitter (ie, a signal transmitter using a scrambling code and / or a spreading code) and a corresponding signal receiver.

[0017] In other words, the method provides a signal, ie an interference signal or more precisely a perturbation signal, for effectively interfering with a GNSS signal, ie at least one signal transmitted by a GNSS signal transmitter, such as a satellite.

[0018] The corresponding signal provided by the system may therefore correspond to an interference signal or, more precisely, a disturbance signal.

[0019] Thus, the signal transmitter may be a Global Navigation Satellite System (GNSS) signal transmitter, in particular a satellite. Thus, the corresponding signal provided by the system, ie the interference signal or more precisely the disturbance signal, may be a GNSS signal.

[0020] Because at least one interference signal has the same scrambling code and / or spreading code as a specific signal transmitted by a first global navigation satellite system signal transmitter (e.g., a corresponding satellite of the system), the specific signal receiver to be disturbed is synchronized with the transmitted interference signal and thus loses communication with the corresponding GNSS signal transmitter. In other words, the transmitted first signal disturbs the communication between the first signal transmitter and the signal receiver, while replacing the communication link previously established between the first signal transmitter and the signal receiver.

[0021] Since the same scrambling code and / or spreading code is used, it is ensured that the disturbance / interference occurs after despreading. In contrast, a typical linear frequency modulation signal disturbs the communication before despreading. Since the interference occurs after despreading, a higher interference efficiency can be obtained even if the same radio frequency (RF) power used to provide the first signal is used. In other words, the same interference efficiency can be obtained when using the first signal with a smaller RF power. Therefore, the corresponding system does not need to require corresponding facilities for providing high RF power.

[0022] One aspect provides a first signal simulating a corresponding signal of a first signal transmitter. As described above, the first interference signal may relate to a corresponding global navigation satellite system signal transmitted by a first global navigation satellite system signal transmitter (i.e., a corresponding satellite). This ensures that the signal emitted by other actual global navigation satellite system signal transmitters is superimposed by the provided interference signal, so that the signal receiver is synchronized with the interference signal instead of the global navigation satellite system signal. However, since the payload involves pseudo-noise, the signal receiver cannot obtain any available information. Therefore, the signal receiver will particularly discard the first signal transmitter from an internal list of possible or more precisely available signal transmitters.

[0023] On the other hand, a second signal is transmitted during a second preconfigured time slot, wherein the second signal uses the same scrambling code and / or spreading code as the second signal transmitter, and wherein the second signal has pseudo noise as a payload. Therefore, a second interference signal using the same scrambling code and / or spreading code as the second global navigation satellite system signal transmitter (i.e., the second satellite) can be transmitted. Similar to the first signal, the second signal is created according to the standard of the corresponding signal transmitter (i.e., the second signal transmitter), while using the same scrambling code and / or spreading code. However, the payload of the signal is pseudo noise, so that no (useful) information is transmitted by the second signal. This means that since the second signal only provides pseudo noise (content), the second signal neither transmits correct information nor any false information.

[0024] The second signal may also disturb the communication between the second signal transmitter (ie the signal transmitter using the scrambling code and / or the spreading code) and the corresponding signal receiver. Therefore, the second signal transmitter may also involve a global navigation satellite system (GNSS) signal transmitter, in particular a satellite.

[0025] In other words, the method provides two signals for effectively interfering with the GNSS signal, i.e. two interference signals or more precisely two perturbation signals. In particular, at least a signal transmitted by a first GNSS signal transmitter (e.g. a first satellite) and a signal transmitted by a second GNSS signal transmitter (e.g. a second satellite) are perturbed.

[0026] Since the interference signal has the same scrambling code and / or spreading code as the specific signal transmitted by the first global navigation satellite system signal transmitter (e.g., the corresponding satellite of the system), the specific signal receiver to be disturbed is synchronized with the transmitted interference signal and thus loses communication with the corresponding GNSS signal transmitter. In other words, the transmitted signal disturbs the communication between the corresponding signal transmitter and the signal receiver.

[0027] Typically, the first signal (i.e., the first interference signal) and the second signal (i.e., the second interference signal) are transmitted during a preconfigured time slot to ensure that the signal receiver receives the corresponding signal within a specific time period. Typically, if no valid signal is received from the first signal transmitter, the signal receiver switches from the first signal transmitter to the second signal transmitter.

[0028] Since the first (interference) signal includes pseudo noise as a payload, the signal receiver will not receive a valid signal, and therefore, the signal receiver will switch to the second signal transmitter. Since the second (interference) signal also only includes pseudo noise as a payload, the second signal received by the signal receiver is also invalid.

[0029] Typically, if the signal receiver does not receive a valid signal from the corresponding signal transmitter, the signal receiver may eliminate or rather discard the corresponding signal transmitter from the internal list of available signal transmitters. Thus, providing a (interference) signal having the same scrambling code and / or spreading code as the signal transmitted by the corresponding signal transmitter while having pseudo noise as the corresponding payload ensures that the list of available signal transmitters used by the signal receiver to establish a communication link is reduced.

[0030] Typically, the first signal and the second signal are transmitted in a sequential manner. In particular, the second signal is transmitted after a first preconfigured time slot has expired, in which the first signal was transmitted.

[0031] The corresponding preconfigured time slots (ie, the first preconfigured time slot and the second preconfigured time slot) may have the same length or different lengths.

[0032] In addition, a plurality of different signals may be transmitted, in particular in a cyclic manner. A plurality of different signals relate to a plurality of different signal transmitters that can establish communication with a signal receiver. When each single signal is transmitted within a preconfigured time slot, a first signal may be transmitted within a second time after a previous signal (i.e., a signal assigned to a previous signal transmitter) was previously transmitted within its respective preconfigured time slot. Therefore, because a plurality of different signals are repeated in their respective order, different signals may be transmitted in a cyclic manner.

[0033] Typically, this ensures that resynchronization of the signal receiver with one of the different signal transmitters can be effectively avoided.As described above, the signal receiver attempts to identify valid content of one of the plurality of signal transmitters.

[0034] When receiving the corresponding signal, since the signal receiver receives only pseudo noise (content), the signal receiver will try to use another signal transmitter and switch to the next signal transmitter for establishing a communication link.

[0035] Furthermore, the signal receiver may discard a signal transmitter if the signal receiver does not receive a valid signal after a certain number of attempts (eg, two attempts, three attempts, or another number of attempts).

[0036] In addition, each of the plurality of different signals is transmitted during a corresponding preconfigured time slot, wherein the plurality of different signals are assigned to a plurality of different signal transmitters. The collected information may include information about the plurality of different signal transmitters, such as the number of signal transmitters and / or the corresponding scrambling codes and / or spreading codes. As discussed above, the number of signal transmitters indicates the number of different signals to be transmitted in order to ensure that all available signal transmitters can be simulated, so that the signal receiver, for example, discards / eliminates the corresponding signal transmitter from an internal list of the signal receiver.

[0037] The number of different signals generated and transmitted corresponds to the number of signal transmitters previously identified, for example, during the step of collecting information (if the information comprises at least the number of signal transmitters and / or the corresponding scrambling codes and / or spreading codes). This ensures that the corresponding signals of these signal transmitters can be created and transmitted in order to perturb the corresponding communication.

[0038] In addition, different types of signals can be transmitted, where different types of signals can be assigned to at least two different types of signal transmitters. For example, a GNSS signal transmitter can involve GPS, Galileo, GLOAS and / or BeiDou as different types of signal transmitters. When transmitting different types of signals, it is ensured that the signal receiver cannot select between different types of signal transmitters (i.e., different systems) in order to establish a communication link with the signal transmitter.

[0039] In particular, different types of signals can be transmitted in a common time slot. When different types of signals are distinguished from each other, for example by means of scrambling codes and / or spreading codes and other characteristics, different types of signals can be transmitted simultaneously because they do not interfere with each other. Therefore, it can be effectively avoided that a signal receiver uses different types of signal transmitters.

[0040] Another aspect provides that each signal is assigned to a dedicated time slot and / or each signal is assigned to a dedicated signal transmitter. Thus, each signal transmitted can be transmitted in a regular or more precisely time-controlled manner to disturb the signal receiver's attempt to establish a communication link with a specific signal transmitter (i.e., a specific satellite). For the same reason, the corresponding signal is also assigned to a dedicated signal transmitter so that the signal of the corresponding signal transmitter can be simulated.

[0041] In other words, the corresponding signal is transmitted in a predefined time period in a preconfigured time slot, wherein the corresponding signal is a corresponding signal simulating a specific signal transmitter. Therefore, only the signal of a specific signal transmitter of a specific type is simulated and transmitted during the corresponding time slot.

[0042] The collected information can be provided automatically and / or by an operator, in particular by means of a user interface. Thus, the system comprises a receiving antenna for receiving the signal of the at least one signal transmitter and / or a user interface enabling an operator of the system to input information. Thus, an operator or user can input corresponding information about the scrambling code and / or the spreading code of the signal transmitter via the user interface. In addition, in particular the number of signal transmitters available to the corresponding signal receiver is also input by the operator via the user interface. The user interface can be part of a system for perturbing the corresponding communication.

[0043] Additionally or alternatively, the respective system may comprise a receiver that receives respective signals of different signal transmitters, such that information about the scrambling codes and / or spreading codes of the signal transmitters (and the number of signal transmitters) is automatically obtained by means of the system (in particular by means of the receiver of the system). The receiver may comprise a receiving antenna and an analysis module for analyzing signals received via the receiving antenna.

[0044] Furthermore, at least the first signal can be used to test the robustness of the signal receiver by superimposing a desired signal for the signal receiver with the first signal. Thus, the first signal can be superimposed with the desired signal in order to test the robustness of the respective signal receiver against interference by the first signal. In effect, it is verified whether the signal receiver is resistant to the first signal.

[0045] In other words, at least one signal (ie the first signal) relates to a test signal for testing the robustness of the signal receiver.

[0046] Typically, the corresponding signal of the signal transmitter (ie the GNSS signal) is simulated by means of the system. This means that modulation and / or coding, such as scrambling codes and / or spreading codes, are used according to the corresponding GNSS standard.

[0047] Furthermore, the cycling or rather the successive simulation of the different signal transmitters (ie the signals of those signal transmitters) ensures that the entire available power of the system is concentrated on a single signal within the respective preconfigured time slot.

[0048] After the expiration of the corresponding preconfigured time slot, the entire power of the available system is focused on the other (ie, next) single signal.

[0049] Therefore, all reception paths of the signal receiver are effectively disturbed or rather interfered, since the different signal transmitters are deemed invalid because the payload of the respective signal corresponds to pseudo noise instead of real or false information.

[0050] In order to provide pseudo noise (content) (ie, static content), an arbitrary waveform processor is sufficient. Therefore, due to the simple waveform processor, the cost for establishing the system can be reduced.

[0051] The information collected at the outset may involve defining a test or interference constellation.

[0052] Typically, the collected information may relate to the corresponding standard of one or more signal transmitters, ie, the GNSS standard, the available signal transmitters (satellites in view), and information about the time, date and location of one or more corresponding signal transmitters.

[0053] Parameters are extracted from the collected information that can be used by a waveform processor to create at least one signal.

[0054] The waveform processor may generate signals, such as IQ signals (in-phase and quadrature data).

[0055] Based on the IQ signal or more precisely the IQ data, a signal to be transmitted is generated by means of a high-frequency modulator and / or an amplifier.

[0056] According to one aspect, the system includes a high frequency modulator and / or amplifier, wherein the high frequency modulator and / or amplifier is located between the waveform processor and the antenna. Thus, the signal created by the waveform processor is modulated to a high frequency by the high frequency modulator. Furthermore, the signal can be amplified by the amplifier. The amplified and / or modulated signal is then forwarded to the antenna for being transmitted.

[0057] For example, the system is a portable system. The invention relates to a movable system. Thus, a plurality of components of the system, in particular all components of the system, can be incorporated into a housing. Thus, the system relates to a device whose housing contains the respective components. In particular, the system can be used in field applications. With lower power of the transmitted signal or signals, it is more difficult to detect a system that disturbs the communication.

[0058] Furthermore, the present invention relates to a test and measurement system for testing the robustness of a signal receiver, wherein the test and measurement system comprises a system as described above. The test and measurement system may comprise a device under test established by the signal receiver. The test and measurement system may comprise a test chamber, such as an anechoic chamber, in which the device under test is placed for testing purposes. The system creates and transmits at least one signal for testing the robustness of the device under test, in particular a specific signal receiver to be tested.

[0059] In addition, the system may include multiple antennas. The multiple antennas may be used to simultaneously transmit multiple different types of signals during a common time slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The present invention will now be described with reference to the preferred embodiments shown in the accompanying drawings. In the accompanying drawings,

[0061] - Figure 1 shows a schematic diagram of a test and measurement system according to the present invention,

[0062] - Figure 2 A schematic diagram showing a system for providing at least one signal according to the present invention, and

[0063] - Figure 3 A flow chart of a method for providing at least one signal according to the present invention is shown. DETAILED DESCRIPTION

[0064] exist Figure 1In FIG. 1 , a test and measurement system 10 for testing the robustness of a signal receiver is shown. The test and measurement system 10 comprises a test space 12 in which a device under test 14 to be tested is located.

[0065] In the embodiment shown, the test space 12 is a test chamber, namely an anechoic chamber.

[0066] Furthermore, the device under test 14 corresponds to a signal receiver 16 , the robustness of which is tested by means of the test and measurement system 10 .

[0067] The test and measurement system 10 also includes a system 18 for providing at least one signal that is transmitted by the system 18 and received by the signal receiver 16 (ie, the device under test 14 ) in order to test the robustness of the signal receiver 16 .

[0068] The system 18 includes a waveform processor 20 and at least one antenna 22 assigned to the waveform processor 20 .

[0069] The waveform processor 20 is configured to create at least one signal to be transmitted via at least one antenna 22 during an assigned preconfigured time slot based on information used by the system 18 to create a corresponding signal in a particular manner as will be described below.

[0070] This information includes at least the scrambling code and / or spreading code to be used by the created signal. The corresponding scrambling code and / or spreading code relates to the code used by the signal transmitter for the signal receiver 16. Therefore, the corresponding signal transmitter is simulated by means of the system 18. In fact, the created signal relates to the signal to be transmitted by the corresponding signal transmitter when communicating with the signal receiver 16.

[0071] Furthermore, the information may include information about the number of signal transmitters that can communicate with the signal receiver 12 .

[0072] The waveform processor 20 creates at least one signal such that the signal uses the same scrambling code and / or spreading code as the corresponding one or more signal transmitters that communicate with the signal receiver 16 (ie, the device under test).

[0073] The at least one signal is created by means of the waveform processor 20 so that the signal has pseudo noise as a payload. In other words, the at least one signal does not have any valid information. In fact, the payload does not even include false information.

[0074] Hence, since a GNSS signal with simple pseudo noise (content) may be generated by means of the waveform processor 20 , the waveform processor 20 may relate to an arbitrary waveform processor.

[0075] The signal created by the waveform processor 20 is forwarded to high frequency in an amplifier 24 and a modulator 26 before being forwarded to an antenna 22 assigned to the waveform processor 20. Thus, the higher frequency modulator 26 and the amplifier 24 are positioned between the waveform processor and the antenna 22.

[0076] Thus, the signal is modulated to a high frequency and amplified so that the test signal provided by the test and measurement system 10 (particularly the system 18 ) corresponds to the real signal that would be generated by the simulated signal transmitter.

[0077] The information used by the waveform processor 20 to create the at least one signal is input via a user interface 28 of the system 18, which enables an operator of the system 18 to input the corresponding information used to create the at least one signal.

[0078] Alternatively, the system 18 may include a receiver 30 via which the real signal is received and analyzed. For this purpose, the receiver 30 includes a receiving antenna 32 and an analysis module 34 assigned thereto in order to receive signals from one or more signal transmitters and analyze these signals. Thus, the information used to create at least one signal is automatically retrieved.

[0079] exist Figure 2 , system 18 is shown separately from test and measurement system 10 .

[0080] The system 18 is set up in a portable manner. Therefore, the system 18 is a portable system. This means that the system 18 can be used in field applications to perturb signals emitted by (different) signal transmitters and received by a specific receiver (e.g. a signal receiver).

[0081] The respective receiver may be a signal receiver that was previously tested by means of the test and measuring system 10 .

[0082] Typically, system 18 (particularly Figure 2 The system shown and the system 18 of the test and measurement system 10 are configured to perform Figure 3 Thus, at least one signal may be provided by the system 18, which signal may be used to test the device under test 14, in particular by superimposing a desired signal with a test signal provided by the system 18, or more precisely, disturbing the communication of a signal receiver with at least one signal transmitter.

[0083] System 18 may send a test signal and a desired signal simultaneously.

[0084] In a first step S1, information is collected, the information including at least one scrambling code and / or spreading code of at least one signal transmitter that may communicate with the signal receiver. The signal transmitter is called a first signal transmitter and is used to distinguish between a plurality of different signal transmitters, as will be described later.

[0085] In a second step S2, a first signal is created by means of a waveform processor 20, wherein the waveform processor 20 creates the first signal so that the signal uses the same scrambling code and / or spreading code as the corresponding signal transmitter (i.e., the first signal transmitter). In addition, the corresponding signal created is referred to as the first signal, which is used to distinguish a plurality of different signals from each other, as will be described later. Therefore, the first signal created relates to the first signal transmitter, in particular to the signal to be transmitted by the first signal transmitter. In other words, the first signal relates to the analog signal of the first signal transmitter.

[0086] In addition, the waveform processor 20 creates the first signal so that the first signal has pseudo noise as a payload. Therefore, the first signal transmits neither real information nor any false information, but transmits pseudo noise.

[0087] Therefore, the content of the first signal can be static. Accordingly, an arbitrary waveform can be provided for the first signal.

[0088] In a third step S3, the first signal created by means of the waveform processor 20 is transmitted via the antenna 22 assigned to the waveform processor 20 during a first preconfigured time slot.

[0089] Previously, the created signal was processed by an amplifier 24 and / or a high-frequency modulator 26 in order to amplify or rather modulate the respective signal before it was fed to the antenna 22 .

[0090] A signal receiver (eg, one of the test and measurement systems 10 or more specifically, a signal receiver in the field) receives a first signal transmitted by the system 18 using the same scrambling code and / or spreading code as the first signal transmitter that normally communicates with the corresponding signal receiver.

[0091] For example, the first signal simulates a signal of a first satellite whose communications should be disturbed by the system 18 .

[0092] Since the transmitted first signal has pseudo noise as a payload, the signal receiver receives invalid information. In other words, the payload has neither real information nor false information, so the information is considered invalid by the signal receiver.

[0093] Therefore, the signal receiver processes pseudo noise (content) received via the corresponding signal after decoding, while collecting meaningless information from the payload of the corresponding signal.

[0094] Since the information is invalid, the signal receiver cannot process the information obtained from the first signal in a meaningful way.

[0095] Therefore, the signal receiver will switch from the first signal transmitter (ie, the first GNSS signal transmitter) to the second signal transmitter (ie, the second GNSS signal transmitter) while attempting to establish communication in order to receive valid information from the second signal transmitter.

[0096] Typically, the signal receiver switches from the first signal transmitter to the second signal transmitter after a certain time period. The time period may correspond to a first preconfigured time slot during which the first signal is transmitted by the system 18.

[0097] In practice, it is previously verified how long the corresponding signal receiver attempts to establish communication with a specific signal transmitter. This time period is measured and stored in the system 18, so that the system 18 transmits a corresponding signal simulating the signal of the corresponding signal transmitter within a specific time period.

[0098] Thus, the system 18 (particularly the waveform processor 20 thereof) creates a first signal within a first preconfigured time slot in which a corresponding signal is transmitted.

[0099] After the first preconfigured time slot, system 18 creates and transmits a second signal that is different from the first signal.

[0100] In other words, when the signal receiver attempts to establish communication with the second signal transmitter instead of the first signal transmitter, the system 18 changes the signal or signals transmitted.

[0101] The second signal uses the same scrambling code and / or spreading code as the second signal transmitter to which the signal receiver has switched to establish corresponding communications.

[0102] In addition, the second signal also has pseudo noise as a payload, so that the signal receiver does not receive valid information.

[0103] In a similar manner as discussed above with respect to the first signal, the second signal is also created by means of the waveform processor 20 and transmitted by means of the at least one antenna 22 during a second preconfigured time slot.

[0104] Therefore, the signal receiver attempting to establish communication with the second signal transmitter only receives the second signal provided by the system 18 instead of the real signal of the second signal transmitter. In addition, the signal receiver attempts to establish communication within a specific time period corresponding to the second preconfigured time slot during which the second signal is transmitted by the system 18.

[0105] After a certain period of time, the signal receiver switches to another signal transmitter (ie, the third signal transmitter) in order to receive valid information from the third signal transmitter.

[0106] However, the system 18 also creates and transmits another signal (ie, a third signal) in order to interfere with the communication of the signal receiver with the third signal transmitter.

[0107] In addition, the third signal also includes the same scrambling code and / or spreading code as the third signal transmitter, while having pseudo noise as a payload. Therefore, the signal receiver will also have to switch to another signal transmitter for establishing communication.

[0108] This process is repeated in a round-robin fashion for all signal transmitters available to the signal receiver until a signal receiver is found providing valid information.

[0109] However, the information collected at the beginning includes information of all available signal transmitters, in particular the number of available signal transmitters and the scrambling codes and / or spreading codes of the signal transmitters.

[0110] In other words, the system 18 is capable of creating and transmitting multiple different signals, each signal having the same scrambling code and / or spreading code as a corresponding signal transmitter, wherein the different signals each have pseudo noise as a payload.

[0111] The created respective signals are transmitted in respective preconfigured time slots corresponding to the time periods during which the signal receiver attempts to establish communication with the respective signal transmitter.

[0112] Thus, it is ensured that the signal receiver cannot establish effective communication with one of the multiple signal transmitters that are available and intended for communication. In other words, the system 18 avoids effective communication between the signal receiver and any signal transmitter. Therefore, the system 18 effectively disturbs or rather interferes with the communication of the signal receiver and the available signal transmitters.

[0113] The signal receiver may attempt to establish communication with any one of the signal transmitters multiple times.

[0114] Therefore, the system 18 creates and transmits different signals in a round-robin manner in order to avoid resynchronization with any signal transmitter during the second or further attempts.

[0115] The signals may be created and transmitted in a round-robin fashion in the same order as used by the signal receiver or in another order.

[0116] After one or more attempts to establish communication with a specific signal transmitter, the signal receiver typically eliminates / discards the corresponding signal transmitter from an internal list of available signal transmitters. The signal receiver will then no longer attempt to establish communication with the corresponding signal transmitter.

[0117] When elimination / discarding of a corresponding signal transmitter is completed for each available signal transmitter after a certain time, the signal receiver can no longer communicate with one of the plurality of signal transmitters.

[0118] Therefore, the communication is effectively disturbed.

[0119] Generally, the system 18 enables perturbing communications with signal receivers in an efficient manner because all available power can be concentrated in a single signal during a corresponding preconfigured time slot in order to perturb only the signal assigned to one of the multiple signal transmitters.

[0120] When the concentration of available power is completed in a cyclical manner, the system 18 simulates all available signal transmitters in a sequential manner so that all reception paths of signal receivers are effectively disturbed. Therefore, no communication is available after a certain time.

[0121] In general, signals transmitted by system 18 may involve different types of signal transmitters.

[0122] Typically, the signals may relate to Global Navigation Satellite System (GNSS) signals, with different types relating to different types of satellite communication systems, such as GPS, Galileo, GLONASS and / or BeiDou.

[0123] This ensures that a respective signal receiver cannot establish communication with one of the plurality of different global navigation satellite systems, since all global navigation satellite systems of the respective type are disturbed in an effective manner.

[0124] Different types of signals may be transmitted in a sequential or simultaneous manner.

[0125] Since the corresponding signals of different types generally have different scrambling codes and / or spreading codes, the different types of signals do not interfere with each other, and therefore, those signals can be transmitted simultaneously.

[0126] As mentioned above, the information used to create the signal, such as the scrambling code and / or the spreading code and the number of signal transmitters available at the respective time, can be manually collected. In fact, the operator can input the information via the user interface 28.

[0127] Alternatively, the receiver 30 of the system 18 receives different signals of the signal transmitter, which are analyzed internally (ie by means of the analysis module 34 ).

[0128] In fact, the information is collected automatically, i.e. by analyzing the information of one or more signals received in an automatic manner. Since the information required to generate the interference or rather perturbation signal is collected automatically, the corresponding information is processed by the system 18 so that (satellite) communications can be effectively perturbed without any manual input.

[0129] Since the corresponding power required to perturb the (satellite) communication is low compared to using a chirp signal, it is ensured that the operator of the system 18 cannot be easily identified. In other words, the system 18 itself has low radiation, which ensures that it is more difficult to detect.

Claims

1. A method for providing at least one signal, comprising the steps of: - collecting information including at least one scrambling code and a spreading code of at least one signal transmitter, wherein the collected information is provided automatically by means of a receiving antenna receiving signals of said at least one signal transmitter, and / or provided by an operator by means of a user interface enabling said operator to input information; as well as - transmitting at least a first signal during a first preconfigured time slot, wherein the first signal uses the same scrambling code and spreading code as the first signal transmitter, and wherein the first signal has pseudo noise as a payload.

2. The method according to claim 1, characterized in that: The first signal simulates a corresponding signal of the first signal transmitter.

3. The method according to claim 1 or 2, characterized in that: A second signal is transmitted during a second preconfigured time slot, wherein the second signal uses the same scrambling code and spreading code as the second signal transmitter, and wherein the second signal has pseudo noise as a payload.

4. The method according to claim 1 or 2, characterized in that: Transmits multiple different signals.

5. The method according to claim 4, characterized in that The plurality of different signals are transmitted in a cyclic manner.

6. The method according to claim 4, characterized in that Each of the plurality of different signals is transmitted during a respective preconfigured time slot, wherein the plurality of different signals are assigned to a plurality of different signal transmitters.

7. The method according to claim 6, characterized in that The collected information includes information about these multiple different signal transmitters, such as the number of signal transmitters and / or corresponding scrambling codes and spreading codes.

8. The method according to claim 1 or 2, characterized in that: Different types of signals are transmitted, wherein the different types of signals are assigned to at least two different types of signal transmitters.

9. The method according to claim 8, characterized in that The different types of signals are transmitted in common time slots.

10. The method according to claim 1 or 2, characterized in that: Each signal is assigned to a dedicated time slot and / or each signal is assigned to a dedicated signal transmitter.

11. The method according to claim 1 or 2, characterized in that: At least the first signal is used for testing the robustness of the signal receiver by superimposing a signal which is wanted for the signal receiver with the first signal.

12. A system (18) for providing at least one signal, comprising a waveform processor (20) and at least one antenna (22) assigned to the waveform processor (20), wherein the waveform processor (20) is configured to create at least one signal to be transmitted by means of the at least one antenna (22) during an assigned preconfigured time slot based on collected information, wherein the information comprises at least a scrambling code and a spreading code of at least one signal transmitter, wherein the system (18) comprises a receiving antenna for receiving signals of the at least one signal transmitter in order to automatically collect the information and / or a user interface enabling an operator of the system (18) to input the information, wherein the waveform processor (20) is configured to create at least one signal to be transmitted such that the at least one signal uses the same scrambling code and spreading code as a corresponding signal transmitter, and The waveform processor (20) is configured to create a signal such that the signal has pseudo noise as a payload.

13. The system (18) according to claim 12, characterized in that The system (18) includes a high frequency modulator (26) and / or an amplifier (24), wherein the high frequency modulator (26) and / or the amplifier (24) are positioned between the waveform processor (20) and the antenna (22).

14. The system (18) according to claim 12 or 13, characterized in that The system (18) is a portable system.

15. A test and measurement system (10) for testing the robustness of a signal receiver (16), wherein the test and measurement system (10) comprises a system (18) according to claim 12 or 13.

16. The test and measurement system (10) according to claim 15, characterized in that The test and measurement system (10) includes a device under test (14) established by the signal receiver (16).

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