KR20210154132A - Method and device for generating signal using multi cw sweep and narrow bandwidth awgn - Google Patents

Abstract

The present invention relates to a frequency generation method and device, which improve limit of output degradation when generating a disturbance signal and enable more complete coverage of a required band. Provided is the frequency generation method comprising the steps of: dividing two or more CW signals into bands in a multi CW sweep unit (1110) and sweeping the same to generate a multi-CW sweep signal; generating a narrowband AWGN corresponding to a frequency space between steps of the CW signal in a narrowband AWGN generator (1121); and mixing in a mixing unit (1122) to cover the frequency space between steps of the multi-CW sweep signal with the AWGN signal.

Description

Signal generating method and signal generating device using multi-CW sweep and narrow-band AWGN

The present invention relates to blocking and protection of wireless communication, and more particularly, a frequency that improves the limit of output degradation when synthesizing a continuous wave sweep type disturbance signal and enables more complete coverage of a required band. It relates to a production method and an apparatus thereof.

Recently, with the development of wireless communication technology, a request for frequency synthesis is increasing, and a functional request for a frequency synthesizer for this purpose is increasing. In addition, in order to have various functions for security at higher frequencies and wider bandwidths, such frequency synthesizers are gradually being designed as multi-function and high-performance circuits.

Wireless communication networks transmit radio waves to the air so that information can be exchanged in various forms such as one-to-one, many-to-one, and one-to-many. called jamming).

In general, a method of transmitting white noise to block wireless communication is used. White noise is noise that includes the output of all frequencies within a certain frequency band, and the relationship between the frequency and the ratio of its components follows a normal distribution.

When white noise is used, it has the advantage of being able to disturb evenly in a relatively wide frequency band. However, when the bandwidth of white noise is narrow, the effectiveness of the disturbance decreases, and when the bandwidth is wide, the output of the disturbance is low, resulting in poor performance of disturbance. I have a problem.

In addition, a tone sweep method of jamming method is also widely used, and the tone sweep method provides intensive disturbance performance in a specified frequency band.

Korean Patent Laid-Open Publication No. 10-2005-0068668 proposes a radio wave jamming method of a mobile communication terminal.

1 is a graph showing propagation characteristics of such a tone sweep method.

In the frequency band (f-a to f-b) in which the tone sweep is performed, the output (m) is excellent, so that disturbance of wireless communication within a specific area can be smoothly performed, and the circuit implementation is simple. In the case of the white noise method, a drop in output in a predetermined range generally occurs compared to the output m in the tone sweep method.

However, the tone sweep method has a limitation in that it is a relatively narrow band, so that when a frequency band requiring disturbance is wide, there is a problem in that the disturbance performance is deteriorated. In particular, in the continuous wave sweep, there is a limitation in that an empty space of the frequency is generated.

In the case of the above-described white noise method, the entire band may be covered, but compared to the continuous wave sweep method, the signal peak value decreases in proportion to the bandwidth, so the efficiency is low.

The present invention has been devised to overcome the problems of the prior art, and a frequency generation method using CW sweep and AWGN that can completely provide coverage performance for a required band while improving the tone power reduction of the continuous wave sweep method and to provide a device therefor.

The present invention for solving the above problems includes a multi-CW sweep unit 1110 that sweeps a multi-CW signal by dividing a selected frequency band and generates a multi-CW sweep signal, and each frequency band in a state in which each CW signal is swept A narrowband AWGN generating unit 1121 that generates a narrowband AWGN covering both step areas, and a mixing unit 1122 that covers the entire band for jamming by covering the frequency space between the steps of the multi-CW sweep signal with the AWGN signal ) signal generation unit 1100 consisting of; an RF unit 1200 for upconverting the signal of the signal generator to a commercial frequency band; an amplifier unit 1300 amplifying the RF output to a set power level; and the number of CW tones swept by the multi-CW sweep unit, a step and a sweep time, a band of AWGN generated by the narrow-band AWGN generating unit, and the power of the amplifier unit are set. Control unit 1700; provides a signal generating device comprising a.

The signal generator determines the full bandwidth by the sum of the bands of a plurality of CW tones, and sweeps the plurality of CW signals in the IF band by varying the steps and sweep times of the CW tones to obtain a higher peak power than the sweep method of a single CW tone. function to have

The narrowband AWGN generating unit generates and mixes an AWGN having a limited bandwidth corresponding to a band covering both regions between each step in the CW sweep signal, so that the effect of peak power compared to the case of applying white noise to the entire band It can function to reduce the load on the HPA by reducing the

In addition, the multi-CW sweep unit may be configured by selecting a plurality of DDSs and FPGAs to generate a sinusoidal CW signal having the same size, respectively.

Preferably, the amplifier further includes a BPF (1400) for band-passing to reduce interference of adjacent frequencies due to the output frequency among the outputs of the amplifier unit.

On the other hand, the present invention comprises the steps of (a) dividing a band by a plurality of sinusoidal CW signals having the same size in a multi-CW sweep unit and sweeping the band to generate a multi-CW sweep signal, (b) In the narrowband AWGN generator 1121, generating an AWGN having a limited bandwidth corresponding to a band covering both regions between each step in the CW sweep signal, and (c) between the steps of the multi-CW sweep signal in the mixing unit Mixing to cover the frequency space of the AWGN signal, (d) upconverting the mixed signal to a commercial frequency band in the RF unit, (e) the upconverged signal in the amplifier unit 1300 It provides a signal generating method comprising the step of amplifying and outputting from the transmitter 1500 .

According to the present invention, both the advantage of maintaining the peak power of the multi-CW sweep and the advantage of covering the entire range of white noise can be exhibited, and the load is reduced compared to equipment having the same output.

In addition, there is an effect of allowing the user to select a corresponding frequency and disturbing only the signal of the corresponding frequency band, thereby blocking the signal of the corresponding band without wasting resources. In particular, it is possible to efficiently respond to various environments because it is possible to set the frequency, and to adjust the CW step and sweep time.

1 is a graph showing propagation characteristics of a tone sweep method of the prior art.
2 is a block diagram of an embodiment of a signal generator using a multi-CW sweep and narrowband AWGN of the present invention.
3 is a block diagram for explaining an embodiment of the signal generator in the signal generator using the multi-CW sweep and narrowband AWGN of the present invention.
4 is a flowchart for explaining the operation of the signal generator according to the concept of the present invention.
5 is a graph showing peak power in case of single and multi CW signals and white noise as a comparative example.
6 is a graph for explaining the concept of a multi-CW sweep.
7 is a graph for explaining a process of mixing a multi-CW sweep and a narrowband AWGN according to an embodiment of the present invention.
8 is a graph for explaining a signal generated by the process of FIG. 7 .

Hereinafter, an apparatus and method for generating a signal using a multi-CW sweep and narrowband AWGN according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

However, the embodiments described below are merely for explaining in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily implement the invention, which limits the protection scope of the present invention. doesn't mean

In the following description, when a part is 'connected' to another part, it includes not only a case in which it is directly connected, but also a case in which another element or device is interposed therebetween. In addition, when a part 'includes' a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

2 is a block diagram of an embodiment of a signal generator using a multi-CW sweep and narrowband AWGN of the present invention.

The signal generating apparatus of the present invention may transmit a protection signal or a jamming signal that is controlled and generated through a predetermined control operation to a predetermined area or location through the transmitter 1500 . In the present invention, the application of transmission of a signal for radio wave disturbance is basically described as a main example, but the purpose of the signal provided in the present invention is irrespective of the purpose. The transmitter 1500 may perform a function of transmitting a predetermined frequency for the purpose of disturbance to block reception of a signal for microwave communication, however, if the concept of the present invention is applied, a frequency band to be disturbed Of course, it can be set in various ways.

In the present invention, elements such as a required band and output can be selected through operation of the control unit 1700 in the field in order to generate a predetermined signal, but the concept of the control unit 1700 exists on a network and is monitored remotely It can be understood as including the concept of control. In this case, the control unit 1700 may be configured as a network management system (NMS).

The signal generator of the present invention may receive a remote control signal from the control unit 1700 or operate according to a predetermined algorithm, sweep a plurality of CW tones and mix the AWGN in a manner that fills the frequency space between steps, then the commercial frequency A disturbance signal can be generated by upconverging to a band and filtering it. A detailed generation process related thereto will be described later.

The signal generating apparatus of the present invention comprises a signal generating unit 1100, an RF unit 1200, an amplifier unit 1300, a BPF 1400, a transmitting unit 1500, a power supply unit 1600, and a control unit 1700. can be

The signal generator 1100 performs, for example, a function of sweeping a multi-CW signal in an intermediate frequency (IF) band. The CW signal (Continuous Wave) may be understood as a continuous wave, and the frequency band may be selected by a user's selection and input through the controller 1700 . That is, it is linearly swept across the RF band in the selected frequency region.

One or more Direct Digital Synthesizer (DDS) or Field Programmable Gate Array (FPGA) may be selected and combined to generate a plurality of CW tones in the signal generator 1100. However, in this regard, various known elements may be applied. Of course you can. The bandwidth (BandWidth) of the CW signal generated by the signal generator 1100 may be 5 MHz to 40 MHz depending on the channel, but this bandwidth may be optional.

According to the concept of the present invention, AWGN (Additive Gaussian White Noise) capable of filling the frequency band between each step at the frequency swept by the signal generator 1100 is applied, and precisely generated between each step of the multi-CW sweep signal Narrowband AWGNs that can fill the frequency space that are used can be mixed. In this regard, a detailed description will be provided later.

Meanwhile, the sweep time of the CW tone may be 1 ms to 100 ms, which is optional.

The power supply unit 1600 receives power of a predetermined voltage, as an embodiment, single-phase alternating current (AC) 220V from the outside, and a predetermined direct current ( DC) power can be supplied. In this way, when the power supply unit is connected to the power source, it may be combined with an uninterruptible power supply (UPS). In addition, as another embodiment, the power supply unit 1600 may be configured as a power supply unit (PSU), and in this case, may be combined with a backup power unit for stable power supply.

The RF unit 1200 receives a predetermined DC power from the power supply unit 1600 and converts the signal of the IF band generated by the signal generation unit 1100 into the RF band. That is, the RF unit 1200 functions to upconvert the IF frequency generated by the signal generator 1100 into a commercial frequency band.

The RF unit 1200 converts the carrier signal of each channel generated by the signal generator 1100 into an RF frequency band of a predetermined band. The frequency band converted by the RF unit 1200 may be a microwave frequency band. However, this is an example, and the frequency band upconverted in the present invention is not limited thereto.

As a preferred embodiment, the input frequency (Input Frequency) of the RF unit 1200 may have a band of 55 to 85 MHz or 140 to 180 MHz, which can be changed according to the bandwidth. Also, the output frequency may be in a band of 2 GHz to 40 GHz.

The amplifier unit 1300 receives predetermined power from the power supply unit 1600 and amplifies a signal output from the RF unit 1200 . The power level of the signal output from the amplifier unit 1300 may have a higher power level than the power level of the signal of the band to be disturbed.

The BPF 1400 functions to suppress an unwanted wave signal of an unwanted band among the signals output from the amplifying unit 300 , select only a signal within a designated band, and output it to the transmitter 1500 as a jamming signal. The BPF 1400 may function to reduce the influence of interference on adjacent frequencies due to the output frequency of the amplifier unit 1300 . In addition, it is possible to additionally perform a protection function of the equipment due to lightning. However, in the case of the filter, various well-known elements may be applied.

When a frequency band for which disturbance is desired is selected, the controller 1700 receives an input for the corresponding selection. The controller 1700 may set a signal band, the number and steps of CW tones, a sweep time, a band of AWGN, power, and the like. As described above, the control unit 1700 may be connected to the remote management unit by a relay network to receive a centralized control signal, and in some cases, an individual user's operation unit may be provided.

In the present invention, the band is determined by the user's selection, and the signal generator 1100 generates a carrier by generating a CW signal through DDS or FPGA to correspond thereto. When the selected bandwidth is 40 MHz, 8 channels of 5 MHz are may be selectable. This bandwidth is determined by the sum of the bands of a plurality of CW tones, and in this case, the bandwidths of the RF unit 1200 and the amplifier unit 1300 may also correspond to the generation bandwidths of the digital signal generation unit 1100 . An example of application of bandwidth and output to a plurality of CW signals in preparation for a case in which the CW signal generated by the signal generator 1100 is single will be described later.

3 is a block diagram for explaining an embodiment of the signal generator in the signal generator using the multi-CW sweep and narrowband AWGN of the present invention, and FIG. 4 is a flowchart for explaining the operation of the signal generator.

A step for the tone of the basic CW signal generated by the multi-CW sweep unit 1110 may be set, for example, a step of 5KHz, a step of 10KHz, a step of 20KHz, a step of 50KHz, a step of 150KHz , 300KHz step, 500KHz step, and 1MHz step, but this is optional, and the tone means a sinusoidal signal having a single frequency.

In the multi-CW sweep unit 1110, DDS and FPGA may be selected and combined, respectively, and, for example, when each signal generating unit is formed of DDS, a predetermined sinusoidal first CW signal and a second CW signal are generated and these Signals can be formed to be of equal magnitude. In this way, the first CW signal and the second CW signal output from each generator may be swept in the IF band. This process corresponds to the multi-CW signal generation (S110) and the IF band sweep (S111) with reference to FIG. 4 .

As another embodiment, a case in which a CW signal of one tone is input to a plurality of signal generators to perform a sweep and sweeps a plurality of CW signals to a predetermined IF band based on this may be considered. In this case, compared to the case of the above embodiment, the interference efficiency of noise may be remarkably improved.

In the case of such a multi-CW tone sweep, various known sweep methods may be applied, and the step and sweep time of the continuous wave are variable depending on circumstances, and the description of the present invention is not limited thereto.

On the other hand, for the multi-CW swept signal, the narrowband AWGN generator 1121 generates an AWGN having a predetermined limited bandwidth (S120) and mixes it in the mixing unit 1122 (S121) to generate a desired signal. .

Preferably, the band of the AWGN is sufficient to cover an area equal to or greater than the frequency space of the step in at least one CW signal, and a plurality of narrowband AWGNs can be mixed at each step interval to cover the entire band. do.

5 is a graph for comparing power characteristics in multi-CW sweep and white noise.

5A shows a single CW sweep method, the vertical axis is the output (dBm), and the horizontal axis is the frequency (f). In the case of the single CW sweep method, the output power itself is relatively high, but when the sweep speed is increased, the peak power of the CW tone is lowered due to the PRF (Pulse Repetition Frequency) phenomenon.

5(b) shows the multi-CW sweep method, and it is confirmed that the reduction in tone power is reduced as opposed to the case of a single continuous wave sweep. At this time, the entire band is divided into n pieces (n1 to n5) for each sweep, and the sweep speed is reduced to 1/n to reduce the influence of the PRF.

FIG. 5(c) is a white noise method that generates noise for the entire band, and has a characteristic that the peak value is proportionally reduced to the BW compared to the case where the CW tone is swept.

Because the power reduction in proportion to the band has such a large effect, the white noise method is not easily applied to jamming devices that actively respond in various environments.

6 is a graph showing the case of sweeping multi CW tones in more detail, and will be described together with FIG. 5 .

For example, let's take a look at peak power as an example of setting the total bandwidth as 100 MHz, which is the entire 5G, 20 ns for duration (τ), and 30 KHz for step. Here, we calculate the reduction in peak power at 50dBm of equipment output.

In the case of the single CW sweep in (a) of FIG. 5, the bandwidth T is calculated as 100 MHz/30 KHz * 20 ns and 66.7 μs is obtained. Accordingly, the reduction in carrier power is calculated as -70.5dB as 20log (20ns/66.7μs).

The power reduction per Hz is 20.5 dBm,

RBW 30KHz Power 24 is based 3dBm.

In the case of the multi-CW sweep of FIG. 5 (b), the frequency BW is divided into 5 20 MHz each, and the bandwidth T is calculated as 20 MHz/30 KHz*20 ns, and 13.3 μs is obtained. Accordingly, the reduction of the carrier power is calculated as -63.5dB as 20log(20ns/13.3μs)-10log(1/5).

The power reduction per Hz is 13.5 dBm,

RBW 30KHz Power 31 is based 3dBm.

5 (c) in the case of white noise,

The power reduction per Hz is 30 dBm, [50 dBm-10 log (100 MHz)]

RBW 30KHz Power 14 is based 8dBm.

In the end, under the above conditions, the multi-CW tone sweep method exhibits an effect of 7.0 dBm higher peak power than the single CW tone sweep method and 16.5 dBm higher than the white noise method.

7 is a diagram for explaining a signal generating process using a multi-CW sweep and a narrowband AWGN according to the concept of the present invention.

This signal generation process will be described with reference to FIGS. 3 and 4 , and FIG. 7A shows the result of sweeping the band with 5 CW tones. 7 (b) is an enlarged view of one step section, and shows that a space is generated at a frequency between each step. The signal by the multi-CW tone has a characteristic of a shape substantially similar to that of a comb on a spectrum.

According to the concept of the present invention, the space between each step is filled with AWGN. The narrowband AWGN generating unit 1121 and the mixing unit 1122 function in this regard, and the narrowband may correspond to a band that approximately covers the step regions of both sides in the CW sweep signal.

Accordingly, as shown in (c) of FIG. 7 , in a state in which the multi-CW tone is swept over the entire band, additive Gaussian noise becomes very high in the empty space of the frequency, so that the effect of covering the entire band with the jamming signal occurs.

8 shows a state in which the AWGN covers all multi-CW tones to generate a jamming signal.

As a result, both the advantage of maintaining the peak power of the multi-CW sweep without straining the HPA (high power amplifier) and the advantage of covering the entire range of white noise can be realized.

The concepts of the present invention are not necessarily limited to 1:1 communication such as a wireless telephone network, RC ground/water model machine, model machine, wireless device, vehicle remote starter, 2G, 3G, LTE, general wireless network, It may be flexibly applied for protection or disturbance of radio waves transmitting and receiving various information such as GPS, LTE, WCDMA, Wibro or Wi-Fi High.

While covering the entire band according to the present invention, it is possible to set the frequency, and to adjust the CW step and sweep time, so that it is possible to efficiently respond to various environments.

In the above, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the following claims.

1100...Signal generator 1110...Multi CW sweep unit
1121...Narrowband AWGN generating unit 1122...Mixing unit
1200...RF part 1300...Amp part
1400...BPF 1500...Transmitter
1600...Power supply unit 1700...Control unit

Claims (3)

A multi-CW sweep unit 1110 that sweeps a multi-CW signal by dividing the selected frequency band and generates a multi-CW sweep signal, and a narrow-band AWGN that covers both step areas of each frequency band while each CW signal is swept A signal generating unit 1100 comprising a narrowband AWGN generating unit 1121 for generating , and a mixing unit 1122 for covering the entire band for jamming by covering the frequency space between the steps of the multi-CW sweep signal with the AWGN signal;
an RF unit 1200 for upconverting the signal of the signal generator to a commercial frequency band;
an amplifier unit 1300 amplifying the RF output to a set power level; and
A control unit in which the number of CW tones swept by the multi-CW sweep unit, a step and a sweep time, a band of the AWGN generated by the narrow-band AWGN generating unit, and the power of the amplifier unit are set (1700); including,
The signal generator,
The total bandwidth is determined by the sum of the bands of multiple CW tones, and the step and sweep times of CW tones are varied to sweep multiple CW signals in the IF band to have a higher peak power than the sweep method of single CW tones.
The narrowband AWGN generator,
In the CW sweep signal, it is possible to create and mix an AWGN having a limited bandwidth corresponding to the band that covers both sides between each step, thereby reducing the effect of peak power compared to the case where white noise is applied to the entire band. A signal generator capable of reducing
The method of claim 1,
The multi-CW sweep unit,
A plurality of DDSs and FPGAs are selected and configured to generate sinusoidal CW signals each having the same size,
and a BPF (1400) for band-passing the output of the amplifier to reduce interference of adjacent frequencies due to the output frequency.
A signal generating method through the signal generating device of claim 1 or 2, comprising:
(a) a multi-CW sweep unit sweeps a plurality of sinusoidal CW signals having the same size by dividing a band to generate a multi-CW sweep signal;
(b) generating, in the narrowband AWGN generator 1121, an AWGN having a limited bandwidth corresponding to a band covering both regions between each step in the CW sweep signal;
(c) mixing in the mixing unit to cover the frequency space between steps of the multi-CW sweep signal with the AWGN signal;
(d) upconverting the mixed signal to a commercial frequency band in the RF unit; and
(e) amplifying the upconverged signal in the amplifier unit 1300 and outputting the amplified signal in the transmitter 1500; a signal generating method comprising a.

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