JP5083355B2 - Transmitter - Google Patents

Description

  The present invention relates to a transmission apparatus, and more particularly to a transmission apparatus that interferes with hostile wave communication using a TDMA (Time Division Multiple Access) system.

  As a conventional transmission apparatus that interferes with TDMA communication, the one disclosed in Patent Document 1 is known. This is to receive radio waves including TDMA communication waves, analyze the appearance frequency of communication waves, measure the appearance time for each appearance frequency, of which the appearance time of the appearance frequency is divided into specified intervals When assigned to a time slot, a communication wave having the assigned appearance frequency is determined as a communication wave of the TDMA system, and an interference wave having the appearance frequency is transmitted.

JP 2000-295203 A

  The transmission device disclosed in Patent Document 1 uses a method of determining an appearance frequency of a TDMA communication wave and transmitting the interference wave to the appearance frequency, and always transmits the interference wave to the target communication wave. Therefore, it is easy to detect the presence of jamming waves, and when the station (master station) that controls TDMA communication detects the presence of jamming waves, it continuously transmits the jamming waves by changing the frequency used, etc. There was a problem that it was impossible to do.

  The present invention has been made in order to solve the above-described problems, and provides a transmitting apparatus that can prevent interference waves from being detected by a TDMA communication master station and can transmit interference waves more continuously. For the purpose.

  A transmission apparatus according to claim 1 of the present invention includes a receiver that receives a communication wave including a communication wave of a time division multiple access method, a frequency analyzer that analyzes an appearance frequency of the communication wave received by the receiver, , The appearance time is measured for each appearance frequency of this frequency analyzer, and when the appearance time of the appearance frequency is assigned to a time slot divided into a predetermined interval, communication of the assigned appearance frequency A communication wave detector that determines a wave as a time division multiple access communication wave, and an appearance start and end time for each time slot of the communication wave that is determined as a time division multiple access communication wave by the communication wave detector. Of the time slot analyzer to measure, the direction measuring device to measure the arrival direction of the communication wave determined to be a time division multiple access communication wave, and the time slot of the time division multiple access communication wave, A timing controller that determines that the one with the highest frequency of arrival directions is a time slot used by the parent station, and predicts the appearance start and end times of the time slot used by the parent station in the next cycle; And a transmitter that transmits an interference wave in a time slot used by the master station predicted by the timing controller.

  According to a second aspect of the present invention, there is provided a transmitter for receiving a communication wave including a communication wave of a time division multiple access method, a frequency analyzer for analyzing an appearance frequency of a communication wave received by the receiver, , The appearance time is measured for each appearance frequency of this frequency analyzer, and when the appearance time of the appearance frequency is assigned to a time slot divided into a predetermined interval, communication of the assigned appearance frequency A communication wave detector that determines a wave as a time division multiple access communication wave, and an appearance start and end time for each time slot of the communication wave that is determined as a time division multiple access communication wave by the communication wave detector. Time slot analyzer to measure, level measuring device to measure signal level of communication wave determined as time division multiple access communication wave, and time slot of time division multiple access communication wave A timing controller that determines that the one having the highest frequency of the same signal level is a time slot used by the parent station, and predicts the appearance start and end times of the time slot used by the parent station in the next cycle; And a transmitter for transmitting an interference wave in a time slot used by the master station predicted by the timing controller.

  According to a third aspect of the present invention, there is provided a transmitter for receiving a communication wave including a communication wave of a time division multiple access method, a frequency analyzer for analyzing an appearance frequency of a communication wave received by the receiver, , The appearance time is measured for each appearance frequency of this frequency analyzer, and when the appearance time of the appearance frequency is assigned to a time slot divided into a predetermined interval, communication of the assigned appearance frequency A communication wave detector that determines a wave as a time division multiple access communication wave, and an appearance start and end time for each time slot of the communication wave that is determined as a time division multiple access communication wave by the communication wave detector. Time slot analyzer to measure, azimuth measuring device to measure the arrival direction of communication wave determined as time division multiple access communication wave, and communication wave signal determined to be time division multiple access communication wave The time slot used by the master station is the level measuring device that measures the bell and the time slot of the communication wave of the time division multiple access method that has the highest frequency of the same arrival direction and the same signal level. A timing controller for determining and predicting the appearance start and end times of the time slot used by the master station in the next cycle, and transmission for transmitting an interference wave to the time slot used by the master station predicted by the timing controller Equipped with a machine.

  According to the present invention, by identifying a master station and a general station (slave station) in a TDMA communication wave and transmitting a jamming wave in accordance with the transmission of the master station, it is difficult to detect the presence of the jamming wave, Interfering waves can be transmitted more continuously.

It is a functional block diagram showing the structure of the transmitter which concerns on Embodiment 1 of this invention. It is a functional block diagram showing the structure of the transmitter which concerns on Embodiment 2 of this invention. It is a functional block diagram showing the structure of the transmitter which concerns on Embodiment 3 of this invention.

  Embodiment 1

  A transmission apparatus according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a functional block diagram showing the configuration of the transmission apparatus according to Embodiment 1 of the present invention. In FIG. 1, 1 is a receiver that receives a communication wave including a TDMA communication wave, 2 is a frequency analyzer that analyzes the appearance frequency of the received communication wave, and 3 is an appearance time for each appearance frequency, Among them, when the appearance time of the appearance frequency is assigned to a time slot divided into a predetermined interval, the communication wave detector 4 determines that the communication wave of the appearance frequency is a TDMA communication wave. A time slot analyzer that analyzes the start and end times of each time slot constituting the TDMA communication wave, 5 is an azimuth measuring device that measures the arrival azimuth of the appearing frequency, and 6 is the same as the arrival azimuth for each time slot. It is determined that the time slot with the highest frequency of arrival directions is the time slot used by the master station, and then matches the start time of the time slot predicted to be used by the master station. The timing controller for instructing the transmission timing of harm wave, 7 is a transmitter that transmits an interference wave.

  Next, the operation of the transmission apparatus will be described. When a communication wave from the air is captured by the receiver 1, the frequency of the communication wave is analyzed by the frequency analyzer 2 and the appearance frequency is sent to the communication wave detector 3. The communication wave detector 3 measures the appearance time for each appearance frequency, and when the communication wave detector 3 continues for a predetermined time that can be recognized as being assigned to a time slot divided at a predetermined interval, It is determined that the wave is a wave, and the time slot analyzer 4 is notified. The time slot analyzer 4 measures the start time and the end time of the notified TDMA communication wave in each time slot, and notifies the timing controller 6 of them. The direction measuring device 5 measures the arrival direction of the appearance frequency of the TDMA communication wave, gives the time of the communication wave, and notifies the timing controller 6 of it.

  The timing controller 6 collates the appearance start / end time of each time slot notified from the time slot analyzer 4 with the arrival direction and time notified from the direction measuring device 5, and specifies the arrival direction for each time slot. Then, it is determined that the time slot having the highest frequency of the same arrival direction is the time slot used by the master station for TDMA communication. This is because, in the TDMA system, the master station periodically transmits a synchronization signal called a header in order to synchronize time slots, and therefore the transmission frequency of the master station is higher than the transmission frequency of other child stations. Is used.

  Further, the timing controller 6 estimates the periodicity of the time slot used by the parent station from the start and end times of the plurality of time slots determined to be used by the parent station, and then starts the time slot used by the parent station. Predict end time. This is because the TDMA method allocates a plurality of time slots to a master station and a plurality of slave stations, and periodically transmits in the allocated time slots, so that the start / end time of the next time slot can be predicted. is there. Next, the timing controller 6 instructs the transmitter 7 on the next start / end time of the predicted time slot used by the master station and the frequency used by the TDMA communication wave determined by the communication wave detector 3. The transmitter 7 transmits an interfering wave at the designated frequency during the designated start and end times.

  As described above, among the TDMA communication waves to be disturbed, the disturbing wave can be transmitted only when the master station transmits. Since the master station stops the reception function while it is transmitting, the master station cannot grasp the fact of interference and can misrecognize that communication is established. Furthermore, since the communication wave transmitted by the master station is disturbed, it cannot be received by the slave station, and communication between the master station and the slave station is interrupted. As a result, control and telephone call from the master station become impossible, and as a result, TDMA communication can be cut off.

  Embodiment 2

  In the first embodiment, the time slot used by the master station is determined by the arrival direction. However, the second embodiment is different from the first embodiment in that the time slot is determined using the signal level in addition to the arrival direction. Different. This solves the problem that the time slot used by the master station cannot be correctly identified when the master station and the slave station exist in the same direction as seen from the transmitter of the present invention. 2 is a functional block diagram showing the configuration of the transmission apparatus according to Embodiment 2 of the present invention. The transmission apparatus shown in FIG. 2 includes a level measurement device 8 instead of the azimuth measurement device 5 shown in FIG. It is what you are doing.

  In the same manner as in the first embodiment, the communication wave detector 3 determines the TDMA communication wave, the time slot analyzer 4 measures the start / end time of the time slot, and notifies the timing controller 6 of it. The level measuring device 8 measures the signal level of the appearance frequency of the TDMA communication wave, gives the time of the communication wave, and notifies the timing controller 6 of it. The timing controller 6 collates the start / end time of each time slot notified from the time slot analyzer 4 with the signal level and time notified from the level measuring device 8, and specifies the signal level for each time slot. The time slot having the highest frequency of the same signal level is determined as the time slot used by the master station. Thereafter, as in the first embodiment, the timing controller 6 transmits the next start / end time of the time slot used by the predicted master station and the frequency used by the TDMA communication wave determined by the communication wave detector 3 to the transmitter. 7, the transmitter 7 transmits a jamming wave at the designated frequency during the designated start and end times.

  As described above, by specifying the master station transmission timing of the TDMA communication based on the signal level measured by the level measuring device 8, even if the master station and the slave station exist in the same direction, The discrimination of the time slot to be used is improved, and the interference wave can be transmitted only when the parent station transmits.

  Embodiment 3

  In the first embodiment, the time slot used by the master station is determined based on the arrival direction. In the second embodiment, the time slot is determined based on the signal level. In the third embodiment, the time slot is determined using both the arrival direction and the signal level. This is different from the first embodiment or the second embodiment. This solves the problem that the time slot used by the master station cannot be correctly identified when the master station and the slave station exist in the same direction or at the same distance when viewed from the transmitter of the present invention. . FIG. 3 is a functional block diagram showing the configuration of the transmitting apparatus according to the third embodiment of the present invention. The transmitting apparatus shown in FIG. 3 includes a level measuring instrument 8 in addition to the azimuth measuring instrument 5 shown in FIG. doing.

  The TDMA communication wave is determined by the communication wave detector 3 in the same manner as in the first or second embodiment, the time slot start time is measured by the time slot analyzer 4 and notified to the timing controller 6. . The direction measuring device 5 measures the arrival direction of the appearance frequency of the TDMA communication wave, gives the time of the communication wave, and notifies the timing controller 6 of it. The level measuring device 8 measures the signal level of the appearance frequency of the TDMA communication wave, gives the time of the communication wave, and notifies the timing controller 6 of it. The timing controller 6 starts and ends the individual time slots notified from the time slot analyzer 4, the arrival direction and time notified from the direction measuring device 5, the signal level notified from the level measuring device 8, and All the times are collated, the arrival direction and the signal level for each time slot are specified, and the time slot having the highest frequency of the same arrival direction and the same signal level is determined as the time slot used by the master station. Thereafter, as in the first embodiment, the timing controller 6 transmits the next start / end time of the time slot used by the predicted master station and the frequency used by the TDMA communication wave determined by the communication wave detector 3 to the transmitter. 7, the transmitter 7 transmits a jamming wave at the designated frequency during the designated start and end times.

  As described above, by specifying the master station transmission timing of the TDMA communication based on the arrival direction measured by the direction measuring device 5 and the signal level measured by the level measuring device 8, the master station and the slave station have the same distance in the same direction. Except for the case of existing at the same signal level, the discrimination of the time slot used by the parent station can be improved, and the interference wave can be transmitted only when the parent station transmits.

DESCRIPTION OF SYMBOLS 1 Receiver 2 Frequency analyzer 3 Communication wave detector 4 Time slot analyzer 5 Direction measuring device 6 Timing controller 7 Transmitter 8 Level measuring device

Claims (3)

A receiver that receives a communication wave including a communication wave of a time division multiple access method;
A frequency analyzer for analyzing the appearance frequency of the communication wave received by the receiver;
Appearance time is measured for each appearance frequency of this frequency analyzer, and when an appearance time of the appearance frequency is assigned to a time slot divided into a predetermined interval, a communication wave of the assigned appearance frequency. A communication wave detector that determines a communication wave of a time division multiple access method,
A time slot analyzer that measures the appearance start and end times for each time slot of a communication wave determined as a time division multiple access communication wave by the communication wave detector;
An azimuth measuring device that measures the arrival direction of a communication wave determined to be a time division multiple access communication wave;
Of the time slots of time-division multiple access communication waves, the time slot with the same arrival direction with the highest frequency is determined to be the time slot used by the master station, and the time slot used by the master station in the next cycle A timing controller that predicts the appearance start and end times of
And a transmitter for transmitting an interference wave in a time slot used by the master station predicted by the timing controller. A receiver that receives a communication wave including a communication wave of a time division multiple access method;
A frequency analyzer for analyzing the appearance frequency of the communication wave received by the receiver;
Appearance time is measured for each appearance frequency of this frequency analyzer, and when an appearance time of the appearance frequency is assigned to a time slot divided into a predetermined interval, a communication wave of the assigned appearance frequency. A communication wave detector that determines a communication wave of a time division multiple access method,
A time slot analyzer that measures the appearance start and end times for each time slot of a communication wave determined as a time division multiple access communication wave by the communication wave detector;
A level measuring device for measuring a signal level of a communication wave determined to be a time division multiple access communication wave;
Of the time slots of time division multiple access communication waves, the time slot with the same signal level that is determined to be the time slot used by the parent station is determined, and the time slot used by the parent station in the next cycle A timing controller that predicts the appearance start and end times of
And a transmitter for transmitting an interference wave in a time slot used by the master station predicted by the timing controller. A receiver that receives a communication wave including a communication wave of a time division multiple access method;
A frequency analyzer for analyzing the appearance frequency of the communication wave received by the receiver;
Appearance time is measured for each appearance frequency of this frequency analyzer, and when an appearance time of the appearance frequency is assigned to a time slot divided into a predetermined interval, a communication wave of the assigned appearance frequency. A communication wave detector that determines a communication wave of a time division multiple access method,
A time slot analyzer that measures the appearance start and end times for each time slot of a communication wave determined to be a time-division multiple access communication wave by the communication wave detector;
An azimuth measuring device that measures the arrival direction of a communication wave determined to be a time division multiple access communication wave;
A level measuring device for measuring a signal level of a communication wave determined to be a time division multiple access communication wave;
Among time slots of time division multiple access communication waves, the time slot with the highest frequency of the same arrival direction and the same signal level is determined to be the time slot used by the master station, and the parent slot is used in the next cycle. A timing controller that predicts the appearance start and end times of the time slots used by the station;
And a transmitter for transmitting an interference wave in a time slot used by the master station predicted by the timing controller.

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