JPH0591088A - Communication disturbing device - Google Patents

Abstract

PURPOSE:To obtain the disturbing device in which disturbing is implemented to the communication of the spread spectrum communication system. CONSTITUTION:This device is provided with reception means 1-4 receiving the communication wave of the spread spectrum communication system, a storage means 5 storing the waveform signal of a received spread spectrum communication wave, and a transmission means 7 converting the stored waveform signal into a transmission frequency and sending it intermittently as a disturbing radio wave. Then the spectrum communication line is subject to pseudo synchronization by sending the received and stored signal intermittently as the disturbing radio wave to disturb the communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication jamming device, and more particularly to a device for jamming a spread spectrum communication system communication.

[0002]

2. Description of the Related Art Conventional communication jamming devices are mainly AM
(Amplitude modulation), FM (frequency modulation), etc. are targeted for communication waves having a relatively narrow frequency band. This kind of device is
M, FM and other communication waves are received by swept receivers, channelized receivers, microscan receivers, etc. by high-speed detection, and the received waves are measured and analyzed to analyze the center frequency occupied bandwidth, modulation type, etc. .. Then, the optimum interfering wave is set automatically or manually based on the obtained reception specifications, the interfering signal is generated based on this setting information, the power amplifier amplifies to the required power, and the interfering radio wave from the antenna is generated. Are sending as.

[0003]

Since this conventional communication jamming device is intended for communication waves having a relatively narrow occupied frequency band such as AM and FM, it is necessary for information transmission like spread spectrum communication waves. It is impossible to generate a jamming signal by receiving a communication that transmits a radio wave by expanding a frequency band (that is, the same frequency band as the conventional AM and FM waves) to several hundreds to several thousands, and analyzing and identifying the communication. For example, in the case of the direct sequence method, which is a typical example of spread spectrum communication,
Since the power is evenly distributed in a wide band, the power density is extremely small (1 / hundreds to hundreds / thousands of the normal power) and is often lower than the reception density. Further, since the phase changes at a speed of 1 μs or less, reception and analysis are extremely difficult. As a result, there is a problem that it is difficult to interfere with the communication wave. An object of the present invention is to provide a communication jamming device capable of jamming a spread spectrum communication system communication.

[0004]

The communication jamming device of the present invention includes a receiving means for receiving a communication wave of a spread spectrum communication system, a storage means for storing a waveform signal of the received spread spectrum communication wave, and the storing means. And a transmitting means for converting the waveform signal into a transmission frequency and intermittently transmitting this as an interference radio wave.

[0005]

According to the present invention, the received and stored signals are
By intermittently transmitting as an interfering radio wave, the spectrum communication line is pseudo-synchronized and the communication is disturbed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 shows a system diagram of an embodiment of the present invention. The incoming radio wave is received by the receiving antenna 1, amplified by a high frequency amplifier 2 to a required level, and then converted by a local signal generated by a local signal generator 4 into a low frequency range by a frequency converter 3. The received signal whose frequency has been converted into the low frequency range is sampled at high speed in the waveform storage unit 5, converted into a digital signal and stored. Normal,
A spread spectrum communication system signal consists of a synchronization signal (usually transmitted in a preamble pattern) for synchronizing the data to be transmitted and the spread code, and first transmits the synchronization signal and then the transmission data (including the spread code). ) Is transmitted. Therefore, since the communication start point is only the synchronization signal, a fixed period of time has elapsed since the start of communication (the synchronization signal is usually 1 second or less).
By storing the received signals continuously, the synchronization signal of the spread spectrum communication wave can be captured.

In order to add an interfering wave to the spread spectrum communication wave, the received signal (including the sync signal of the spread spectrum communication wave) stored in the waveform storage 5 is intermittently supplied from the high frequency transmitter 7 as shown in FIG. To send. As shown in FIG. 2, the data stored in the waveform memory 5 is read at the timing from the control circuit 6, and the data is D / A converted into the original received signal, which is amplified to the required power. , By transmitting from the transmission antenna 8.

Thus, by intermittently transmitting the synchronization signal, the communication line which is going to communicate by the spread spectrum communication system is pseudo-synchronized as shown by the dotted line in FIG. Can significantly interfere with the communication.

[0009]

As described above, according to the present invention, a signal including a synchronization signal of the communication is captured and stored in the spread spectrum communication system, and this is intermittently transmitted as an interfering radio wave. As a result, the spread spectrum communication line can be pseudo-synchronized to interfere with the spread spectrum communication. In particular, since the stored signal is used for forming the jamming radio wave, it is not necessary to analyze the parameters of the spread spectrum communication, and the jamming can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a communication jamming device of the present invention.

FIG. 2 is a time chart diagram of a signal in performing jamming.

[Explanation of symbols]

 2 high frequency amplifier 3 frequency converter 4 local signal generator 5 waveform memory 6 control circuit 7 high frequency transmitter

Claims (1)

[Claims] 1. A communication interference device for adding interference to a communication wave of a spread spectrum communication system, which spreads and communicates a frequency band required for transmitting information by several hundred to several thousand times, Receiving means for receiving the communication wave of the spread spectrum communication system, storage means for storing the waveform signal of the received spread spectrum communication wave, and converting the stored waveform signal into a transmission frequency, which is intermittently used as an interfering radio wave. A communication jamming device comprising: a transmitting unit for transmitting.