KR102044010B1 - Method and apparatus for detecting jamming signal - Google Patents

Method and apparatus for detecting jamming signal Download PDF

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Publication number
KR102044010B1
KR102044010B1 KR1020120044334A KR20120044334A KR102044010B1 KR 102044010 B1 KR102044010 B1 KR 102044010B1 KR 1020120044334 A KR1020120044334 A KR 1020120044334A KR 20120044334 A KR20120044334 A KR 20120044334A KR 102044010 B1 KR102044010 B1 KR 102044010B1
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South Korea
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received signal
signal strength
change
jamming
received
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KR1020120044334A
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Korean (ko)
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KR20130121285A (en
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김명순
이상욱
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한국전자통신연구원
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/20—Countermeasures against jamming
    • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/20—Countermeasures against jamming
    • H04K3/25—Countermeasures against jamming based on characteristics of target signal or of transmission, e.g. using direct sequence spread spectrum or fast frequency hopping

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

A method and apparatus for detecting jamming signals are disclosed. The jamming signal sensing method may include generating a second analog signal by downconverting and bandpass filtering the received first analog signal, quantizing the second analog signal to generate at least one quantized sample, and at least one Detecting the received signal strength for the quantized sample and detecting whether the first analog signal is a jamming signal based on the received signal strength. Therefore, accurate jamming signal can be detected.

Description

Jamming signal detection method and apparatus {METHOD AND APPARATUS FOR DETECTING JAMMING SIGNAL}

The present invention relates to a jamming signal detection, and more particularly, to a jamming signal detection method and apparatus capable of accurately detecting a jamming signal.

In general, jamming refers to an act of intentionally causing interference in a radio frequency band to disrupt or disturb a communication system.

Since the conventional jamming signal detecting apparatus covers various frequency bands, there is a problem that it is impossible to detect the jamming signal based on the characteristics of the signal received from the satellite through the navigation frequency band.

In addition, the conventional jamming signal detection device is a configuration for detecting a jamming signal using a power detector, etc., before using the assigned frequency to check the presence of intentional or unintentional interference, and using the assigned frequency It is mainly used in communication system adopting frequency division method.

Therefore, the conventional jamming signal detection device has a problem that it is difficult to detect the jamming signal of the navigation frequency band that is continuously transmitting a signal from the satellite.

In addition, since the received signal strength is measured using the output value of the power detector or the control voltage value of the automatic gain controller, the measurement of the received signal strength is inaccurate and the jamming signal must be detected using the incorrectly measured received signal strength. In other words, there is a problem that a probability of a missing alarm or a false alarm is high and precise judgment is impossible.

An object of the present invention for solving the above problems is to provide a jamming signal detection method that can accurately detect a jamming signal.

In addition, another object of the present invention to provide a jamming signal detection device that can accurately detect a jamming signal.

The jamming signal detection method according to an embodiment of the present invention for achieving the object of the present invention comprises the steps of generating a second analog signal by down-converting and bandpass filtering the received first analog signal; Quantizing the two analog signals to generate at least one quantized sample, detecting received signal strength for the at least one quantized sample, and determining whether the first analog signal is a jamming signal based on the received signal strength Sensing may include.

The detecting of the received signal strength of the at least one quantized sample and detecting whether the first analog signal is a jamming signal based on the received signal strength may include receiving the received signal strength of the quantized sample and the first signal. Comparing the received signal strengths of the quantized samples of the second analog signal received before the two analog signals to calculate an amount of change in the received signal strength of the quantized samples; Calculating a change rate of the change amount of the received signal strength of the quantized sample by comparing the received signal strength, and comparing the change rate of the change amount of the received signal strength and the change amount of the received signal intensity with the preset reference to satisfy the preset criterion; Detecting the first analog signal as the jamming signal It can be included.

Here, the number of the at least one quantization sample may be determined based on the signal characteristics of the navigation frequency band.

Here, the number of at least one quantization sample may be a number corresponding to a repetition period of a code or an integer multiple of the repetition period.

Here, when the received signal intensity change amount and the change rate of the received signal intensity change amount are compared with a preset criterion, the step of detecting the first analog signal as the jamming signal when the preset criterion is satisfied is based on the change amount of the received signal strength change amount. The method may include comparing the rate of change with the first preset reference, and comparing the amount of change in the received signal strength with the second preset reference.

Here, when the received signal intensity change amount and the change rate of the received signal intensity change amount are compared with a preset criterion, the step of detecting the first analog signal as the jamming signal when the preset criterion is satisfied is based on the change amount of the received signal strength change amount. The first analog signal may be detected as the jamming signal when the rate of change exceeds the preset first criterion and the amount of change in the received signal intensity exceeds the preset second criterion.

Here, the preset criterion may be set based on the moving speed of the device when the device on which the jamming signal sensing method is performed moves.

The jamming signal detection apparatus according to an embodiment of the present invention for achieving another object of the present invention includes a receiver for downconverting and bandpass filtering the received first analog signal to generate a second analog signal; Generating at least one quantized sample by quantizing two analog signals, detecting a received signal strength of the at least one quantized sample, and detecting whether the first analog signal is a jamming signal based on the received signal strength It may include a sensing unit.

The detection unit may include: a quantization module configured to generate at least one quantized sample by quantizing the second analog signal, a received signal strength detection module configured to detect received signal strength of the at least one quantized sample, and the quantized sample. Comparing the received signal strength with respect to the received signal strength of the quantized sample of the second analog signal received before the second analog signal to calculate the received signal strength variation of the quantized sample, and Comparing the received signal strength of the quantized sample to calculate the rate of change of the received signal strength change amount of the quantized sample, and compares the rate of change of the received signal intensity and the change of the received signal intensity change amount with a preset reference to the predetermined reference Jamming the first analog signal if satisfied It may include a jamming signal detection module for detecting arcs.

The jamming signal detection module may be configured to output the first analog signal to the jamming signal when the rate of change of the received signal intensity change exceeds a first predetermined reference value and the amount of change in the received signal intensity exceeds a second predetermined reference value. Can be detected.

The preset criterion may be set based on a moving speed of the jamming signal detecting apparatus.

According to the jamming signal detection method and apparatus according to the present invention as described above, the jamming signal is not detected by using the received signal strength detected using the control voltage of the power detector and the automatic gain controller, and the received signal strength of the quantized sample. Since the jamming signal is detected based on the signal, accurate detection of the jamming signal is possible.

1 is a flowchart illustrating a jamming signal detection method according to an embodiment of the present invention.
2 is a flowchart specifically illustrating a method (step S 300) of detecting the first analog signal of FIG. 1 as a jamming signal.
3 is a flowchart specifically illustrating a method (step S 330) of detecting the first analog signal of FIG. 2 as a jamming signal.
4 is a block diagram illustrating an apparatus for detecting jamming signals according to an exemplary embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating a jamming signal detection method according to an embodiment of the present invention, FIG. 2 is a flowchart specifically illustrating a method (step S 300) of detecting the first analog signal of FIG. 1 as a jamming signal, and FIG. 3 is a flowchart specifically illustrating a method (step S 330) of detecting the first analog signal of FIG. 2 as a jamming signal.

1 to 3, the jamming signal sensing method generates a second analog signal by downconverting and bandpass filtering the first analog signal received through the navigation frequency band (S 100).

In detail, step S 100 amplifies the first analog signal received through the antenna through a low noise amplifier (LNA) and converts the amplified first analog signal into a local oscillator and a mixer. Down-converts to a predetermined intermediate frequency (IF) or baseband frequency (BF), amplifies the down-converted first analog signal through an amplifier, and uses a band-pass filter (BPF). ) May be filtered to generate a second analog signal.

Next, at least one quantized sample may be generated by quantizing the second analog signal (S200).

In detail, step S 200 may generate at least one quantized sample of the second analog signal converted to the intermediate frequency or the baseband frequency through analog-digital converting.

Next, the received signal strength of at least one quantized sample may be detected, and the first analog signal may be detected as a jamming signal based on the received signal strength (S 300).

Specifically, in operation S 300, the received signal strength of the quantized sample is compared with the received signal strength of the quantized sample before the quantized sample to calculate an amount of change in the received signal strength of the quantized sample (S 310). The change rate of the change amount of the received signal strength of the quantized sample is calculated by comparing the change amount of the received signal strength with the received signal intensity of the quantized sample (S 320), and the change rate of the change amount of the received signal strength and the change amount of the received signal strength is preset. The first analog signal may be detected as the jamming signal in comparison with a reference (S330).

Here, the number of at least one quantization sample may be determined based on signal characteristics of the navigation frequency band, and the number of the at least one quantization sample corresponds to a repetition period of a code or an integer multiple of the repetition period. Can be any number.

In addition, the reliability of the received signal strength may be increased when the received signal strength is calculated by using a quantized sample corresponding to a repetition period of a code or an integer multiple of the repetition period.

On the other hand, when the preset reference is set based on a value calculated using an average value of the received signal strength, for example, a number of quantization samples corresponding to an integer multiple of the code repetition period, Missing Alarm or False Alarm It can reduce the probability of generating a false alarm.

For example, if the sampling frequency is 20 MHz, the standard deviation of the received signal strength value calculated from the quantization sample corresponding to one period of the code corresponding to 1 msec and the quantization corresponding to one period of the code corresponding to 10 msec Since the ratio of the standard deviation of the received signal strength value calculated from the sample has a power of 10 2 (order), a more precise value is obtained at a faster time than the received signal strength measured based on the control voltage value of the power detector or automatic gain controller. Through this, it is possible to set sophisticated preset criteria, so that fast and precise jamming signals can be detected.

Here, the step S 330 compares the change rate of the change amount of the received signal strength with a preset first reference (S 331), and compares the change amount of the received signal strength with a preset second reference (S 333) to the first analog. The signal can be detected as a jamming signal.

Specifically, in step S 331, the change rate of the change amount of the received signal strength is compared with a preset first criterion, and as a result of the comparison, the change rate of the change amount of the received signal intensity exceeds the preset first criterion (S 332). In step S 333, the received signal strength change amount is compared with a preset second criterion, and when the received signal strength change amount exceeds the preset second criterion (S 334), the first analog signal is output to the jamming signal. It can be detected as (S 335).

The preset reference may be set based on a moving speed of the device when the device on which the jamming signal sensing method is performed moves.

4 is a block diagram illustrating an apparatus for detecting jamming signals according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the jamming signal detecting apparatus 100 may include a receiver 110 and a detector 120.

The receiver 110 may generate a second analog signal by downconverting and bandpass filtering the first analog signal received through the navigation frequency band, and the receiver 110 may include an antenna 111 and a low noise amplifier (LNA). Low Noise Amplifier (112), Local Oscillator (LO) 113, Mixer (Mixer, 114), an amplifier 115 and a Band-Pass Filter (BPF) 116 may be included.

The antenna 111 may receive the first analog signal through the navigation frequency band.

The low noise amplifier 112 may perform low noise amplification of the first analog signal received from the antenna 111.

The local oscillator 113 and the mixer 114 may down-convert the low noise amplified first analog signal to a predetermined intermediate frequency (IF) or baseband frequency (BF).

The amplifier 115 may amplify the downconverted first analog signal.

The bandpass filter 116 may filter the amplified downconverted first analog signal to generate a second analog signal.

The detector 120 quantizes the second analog signal to generate at least one quantized sample, detects the received signal strength of the at least one quantized sample, and detects the first analog signal based on the received signal strength. The detection unit 120 may detect a jamming signal, and the detection unit 120 may include a quantization module 121, a reception signal strength detection module 122, a jamming signal detection module 123, and a digital signal processing module 124. .

The quantization module 121 may generate at least one quantization sample by quantizing the second analog signal.

The received signal strength detection module 122 may detect the received signal strength of at least one quantized sample.

Here, the number of at least one quantization sample may be determined based on signal characteristics of the navigation frequency band, and the number of the at least one quantization sample corresponds to a repetition period of a code or an integer multiple of the repetition period. Can be any number.

In addition, the reliability of the received signal strength can be increased when the received signal strength is calculated by using a quantized sample corresponding to a repetition period of a code or an integer multiple of the repetition period.

On the other hand, when the preset reference is set based on a value calculated using an average value of received signal strength, for example, a number of quantization samples corresponding to an integer multiple of a code repetition period, a missing alarm or a false alarm. It can reduce the probability of generating a false alarm.

For example, if the sampling frequency is 20 MHz, the standard deviation of the received signal strength value calculated from the quantization sample corresponding to one period of the code corresponding to 1 msec and the quantization corresponding to one period of the code corresponding to 10 msec Since the ratio of the standard deviation of the received signal strength value calculated from the sample has a power of 10 2 (order), a more precise value is obtained at a faster time than the received signal strength measured based on the control voltage value of the power detector or automatic gain controller. Through this, it is possible to set sophisticated preset criteria, so that fast and precise jamming signals can be detected.

The jamming signal detection module 123 compares the received signal strength of the quantized sample with the received signal strength of the quantized sample before the quantized sample, and calculates an amount of change in the received signal strength of the quantized sample, and receives the received signal strength of the quantized sample. The change rate of the received signal strength change amount of the quantized sample is calculated by comparing the change amount and the received signal strength of the quantized sample, and the change rate of the received signal strength change amount and the change rate of the received signal intensity change amount are compared with a preset reference. An analog signal may be detected as the jamming signal.

In detail, the jamming signal detection module 123 may generate the first analog signal when the rate of change of the received signal intensity change exceeds a preset first criterion and the amount of change in the received signal intensity exceeds a preset second criterion. The jamming signal may be detected.

In addition, the preset criterion may be set based on a moving speed of the jamming signal detecting apparatus 100.

The digital signal processing module 124 may receive at least one quantized sample and perform digital signal processing to output a received signal corresponding to the received first analog signal.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

100: jamming signal detection device 110: receiver
111: antenna 112: low noise amplifier
113: local oscillator 114: mixer
115: amplifier 116: bandpass filter
120: detector 121: quantization module
122: received signal strength detection module 123: jamming signal detection module
124: digital signal processing module

Claims (13)

Generating a second analog signal by downconverting and bandpass filtering the first analog signal received through the navigation frequency band;
Quantizing the second analog signal to generate at least one quantized sample; And
Detecting whether the first analog signal is a jamming signal by detecting a received signal strength of the at least one quantized sample and calculating a change amount and a change rate of the received signal strength based on the received signal strength and a previous received signal strength; Detecting,
Detecting whether the first analog signal is a jamming signal,
Calculating an amount of change in the received signal strength of the quantized sample by comparing the received signal strength of the quantized sample with the received signal strength of the quantized sample of the second analog signal received before the second analog signal;
Calculating a change rate of the change amount of the received signal strength of the quantized sample by comparing the change amount of the received signal strength of the quantized sample with the received signal strength of the quantized sample; And
And detecting the first analog signal as the jamming signal by comparing the change amount of the received signal strength and the change rate of the change amount of the received signal strength with a preset criterion. delete The method according to claim 1,
The step of detecting the first analog signal as the jamming signal when the amount of change in the received signal strength and the rate of change in the amount of change in the received signal strength is satisfied with the preset criterion,
Comparing a change rate of the received signal intensity change amount with a first preset reference; And
And comparing the received signal strength variation with a second predetermined reference. The method according to claim 3,
The step of detecting the first analog signal as the jamming signal when the amount of change in the received signal strength and the rate of change in the amount of change in the received signal strength is satisfied with the preset criterion,
And detecting the first analog signal as the jamming signal when the rate of change of the received signal strength change amount exceeds the preset first criterion and the received signal strength change amount exceeds the preset second criterion. Jamming signal detection method. The method according to claim 1,
The preset criteria,
And a preset criterion is set based on a moving speed of the device when the device on which the jamming signal detection method is performed moves. The method according to claim 1,
The at least one quantization sample,
Jamming signal detection method characterized in that the number of the at least one quantized sample is determined based on the signal characteristics of the navigation frequency band. The method according to claim 6,
The number of the at least one quantization sample,
Jamming signal detection method characterized in that the number of repetition period of the code or the number corresponding to the integer multiple of the repetition period. A receiver configured to downconvert and bandpass filter the first analog signal received through the navigation frequency band to generate a second analog signal; And
Quantize the second analog signal to generate at least one quantized sample, detect received signal strength for the at least one quantized sample, and determine the received signal strength based on the received signal strength and the previous received signal strength. Comprising a sensing unit for detecting whether the first analog signal is a jamming signal by calculating the amount of change and the rate of change,
The detection unit,
A quantization module quantizing the second analog signal to generate at least one quantized sample;
A received signal strength detection module detecting a received signal strength of the at least one quantized sample; And
The received signal strength of the quantized sample is compared with the received signal strength of the quantized sample of the second analog signal received before the second analog signal to calculate an amount of change in the received signal strength of the quantized sample, and the reception of the quantized sample is received. The change rate of the received signal strength change amount of the quantized sample is calculated by comparing the change amount of the signal strength with the received signal strength of the quantized sample, and the change rate of the received signal strength change amount and the change rate of the received signal intensity change amount are compared with a preset reference. And a jamming signal sensing module configured to sense the first analog signal as the jamming signal when a preset criterion is satisfied. delete The method according to claim 8,
The jamming signal detection module,
Jamming, characterized in that the first analog signal is detected as the jamming signal when the rate of change of the received signal strength change amount exceeds a first predetermined criterion and the received signal intensity change amount exceeds a preset second criterion. Signal detector. delete delete delete
KR1020120044334A 2012-04-27 2012-04-27 Method and apparatus for detecting jamming signal KR102044010B1 (en)

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