KR102132896B1 - Interference signal removal device and method of JTDLS anti-jamming terminal - Google Patents

Abstract

The present invention relates to an apparatus for removing an interference signal of a joint tactical data link system (JTDLS) anti-jamming terminal for improving an error in determining an acquisition signal due to a frequency interference in the high-speed JTDLS anti-jamming terminal, and a method thereof. According to the present invention, the apparatus comprises: a synchronization unit for detecting whether or not a signal is received, and correcting a characteristic of the signal through a detected parameter when the signal is detected; a decoder which decodes the corrected received signal provided from the synchronization unit and then outputs the decoded signal; and a jamming detection and removal unit which detects whether or not there is interference with the received signal decoded by the decoder according to a relative distance from a transmission platform, a received frame error, and a previous received symbol, removes a detected interference signal, and outputs the symbol from which the interference is removed.

Description

Interference signal removal device and method of JTDLS anti-jamming terminal

The present invention relates to an apparatus and method for removing an interference signal of a Joint Tractical Data Link System (JTDLS) anti-jamming terminal, and in particular, a JTDLS anti-jamming terminal for improving an error in determining an acquired signal due to frequency interference in a JTDLS high-speed anti-jamming terminal. It relates to an apparatus for removing interference signals and a method therefor.

The JTDLS system is a DTDMA protocol communication method, and terrestrial/maritime/air power constitutes a network.

When the communication is interrupted by an interference signal such as a jamming signal, the JTDLS high-speed anti-jamming terminal of the JTDLS system overcomes this through interference frequency recognition, high-speed frequency hopping, and repetitive transmission.

Before transmitting data, it recognizes whether it is available for all bands in use frequency in real time, and transmits signals to available frequency channels.

In addition, it is repeated at a fast cycle to minimize the occurrence of frequency interference occurring during transmission.

Nevertheless, after repeatedly transmitting to multiple frequency channels in order to remove frequency interference and noise generated in the transmission section, the signals are determined by synthesizing the repeatedly received signals.

As such, a method for minimizing signal transmission failure due to frequency interference has been conventionally applied. The processing of the received signal in the baseband can be roughly divided into two types.

The first is a synchronization unit. The synchronization unit detects whether a signal is received, and when a signal is detected, corrects a signal characteristic through parameters detected through the synchronization unit.

Second, as a demodulator, the demodulator demodulates the detected signal, and the interference cancellation function for repetitive transmission is performed within the demodulator.

Since the interference signal has a probability that it has little or no correlation with the synchronization unit, the interference signal alone is difficult to pass through the synchronization unit.

In order for a signal contaminated with an interference signal to pass through the synchronization unit, it must have a form added to a transmission signal to be transmitted.

In order for a signal contaminated with an interference signal to pass through the synchronous unit, the characteristics of the transmitted signal must be maintained so as to pass through the synchronous unit. In general, when the size of the interference signal is significantly larger than the transmitted signal, it is difficult to pass the synchronous unit.

If the effect of the interference signal and noise added in the process of transmitting the transmission signal is expressed as an equation, Equation 1 below is given. That is, the received signal r is expressed as the sum of the transmitted signal s and AWGN w.

If the same data is repeatedly transmitted to the transmission signal 5 times, the reception signal is expressed as Equation 2 below, and the noise power is reduced to 1/5.

If 4 pulses are normally received, but +6dBc of interference signal I is received in 1 pulse, the received signal is expressed as Equation 3 below.

That is, the reception level when a signal is normally received without an interference signal is as shown in FIG. 1, and when the signal is normally received, the constellations before and after the repeated reception processing are as shown in FIGS. 2 and 3.

Meanwhile, the reception level when the interference signal is included in the received signal is the same as in FIG. 4, and the constellations before and after repeated reception processing when the interference signal is included in the received signal are shown in FIGS. 5 and 6. same.

The interference signal included in the received signal may change with time. When transmitting a signal in an environment in which an interference signal is present, even if interference that satisfies the performance of the synchronization unit of the transmission signal is achieved, interference sufficient to deteriorate the overall reception performance of the signal after the synchronization unit may occur. have.

In this case, the received signal may be lost as a signal having an ability to remove an interference signal due to repeated transmission after the synchronization unit.

Therefore, the present invention is to solve the above-described conventional problems, the object of the present invention is a JTDLS anti-jamming terminal interference signal removal apparatus and to improve the error determination of the acquired signal due to frequency interference in the JTDLS high-speed anti-jamming terminal and In providing the method.

That is, according to the present invention, when the signal of the JTDLS high-speed anti-jamming terminal interferes with the received signal recovery capability through the repetitive transmission after the synchronization unit during the transmission section of the signal, the interference signal removal apparatus of the JTDLS anti-jamming terminal to overcome this And its purpose is to provide the method.

An apparatus for removing interference signals of a JTDLS anti-jamming terminal according to the present invention for achieving the above object includes: a synchronization unit that detects whether a signal is received and corrects characteristics of the signal through detected parameters when the signal is detected; A decoder which decodes the corrected received signal provided from the synchronization unit and then outputs the decoded signal; And a relative distance from a transmission platform, a received frame error, and interference detection of a received signal decoded by the decoder according to a previous received symbol, jamming detection that removes the detected interference signal, and outputs a symbol with interference removed. It may include a removing portion.

The jamming detection and removal unit includes: a buffer for storing a received signal decoded by the decoder and determining an output of the received signal according to an interference signal detection result; A first power measuring unit measuring a maximum power value of an n-point input pulse for the received signal and outputting it as a signal for determining whether a received signal has passed as a parameter value; A second power measuring unit for calculating a maximum power value for an n-1 th pulse for a received signal at a time n-1 stored in the buffer according to a system demodulation result signal; a maximum power prediction value calculating unit calculating a maximum power value of the n-th input pulse; Outputting a parameter for determining signal interference using the maximum effective power sequence of the received pulses from the maximum power prediction value calculated by the maximum power prediction value calculation unit to n-1 times and a relative distance from a transmitter provided from the platform. Error correction unit; A threshold value calculating unit calculating a threshold value of jamming detection by using the maximum power prediction value of the n-th input pulse calculated by the maximum power prediction value calculation unit and parameters provided by the error correction unit; And a jamming detection unit for determining whether to interfere with the signal using the maximum power for the nth pulse measured by the first power measurement unit based on the threshold calculated by the threshold calculation unit, and then providing the determination signal as a buffer. can do.

The second power measurement unit measures the maximum power only for a false value in which no error is detected as a result of demodulation of the nth pulse.

The maximum power prediction value calculating unit updates the maximum power of the n-1th pulse measured by the second power measurement unit in pulse units to calculate a maximum power prediction value for the nth input pulse through linear prediction.

The maximum power prediction value may be calculated using Equation 4 below.

The error correction unit limits the effective maximum power sequence of the received pulses from n-1 to 1-1 provided from the maximum power prediction value calculation unit to information on m pulses from n-1.

The jamming detection unit provides a true signal as a buffer when signal interference is detected, and provides a false signal as a buffer when signal interference is not detected.

The buffer passes the received signal stored only when the signal provided by the jamming detection unit is a false signal.

The threshold calculation unit is calculated by adding the maximum power prediction value of the n-th input pulse calculated by the maximum power prediction value calculation unit and the parameters provided by the error correction unit.

The parameter output from the error correction unit is a value greater than “0” and is always a value greater than the absolute value of the prediction value calculated by the maximum power prediction value calculation unit.

On the other hand, the interference signal removal method of the JTDLS anti-jamming terminal according to the present invention includes: detecting whether a signal is received through a synchronization unit, and correcting a characteristic of the signal through the detected parameter when the signal is detected; Decoding the corrected received signal provided from the synchronization unit through a decoder; And the jamming detection and removal unit detects the interference with the transmission platform, the received frame error, and the received signal decoded by the decoder according to the previous received symbol, removes the detected interference signal, and removes the interference. And outputting the symbol.

The step of outputting the symbol from which interference has been removed includes: storing an n-th received signal in a buffer; Measuring, by the first power measuring unit, the maximum power value of the n-point input pulse for the received signal and outputting it as a signal for determining whether the received signal has passed as a parameter value; Calculating, by the second power measurement unit, a maximum power value for the received pulse at the point of time n-1 stored in the buffer according to a system demodulation result signal; Calculating a maximum power value of the n-th input pulse in the maximum power prediction value calculating unit; In the error correction unit, for determining signal interference using the maximum effective power sequence of the received pulse from the maximum power prediction value calculated by the maximum power prediction value calculation unit to n-1 times, and the relative distance between the transmitter provided from the platform Outputting parameters; Calculating a threshold value of jamming detection by using a maximum power prediction value of an n-th input pulse calculated by the maximum power prediction value calculation unit and a parameter provided by the error correction unit in a threshold calculation unit; And in the jamming detection unit, determining whether there is signal interference with respect to the maximum power for the nth pulse measured by the first power measurement unit based on the threshold calculated by the threshold calculation unit, and then providing the determination signal as a buffer. It may include.

In the second power measurement unit, the maximum power is measured only for a false value in which no error is detected as a result of demodulation of the nth pulse.

In the maximum power prediction value calculation unit, the maximum power prediction value for the nth input pulse is calculated through linear prediction by updating the maximum power of the n-1th pulse measured by the second power measurement unit in pulse units.

The maximum power prediction value may be calculated using Equation 4 below.

In the error correction unit, the effective maximum power sequence of the received pulses up to n-1 provided by the maximum power prediction value calculating unit is limited to information on m pulses from n-1.

The jamming detection unit provides a true signal as a buffer when signal interference is detected, and provides a false signal as a buffer when signal interference is not detected.

In the buffer, the stored received signal is passed only when the signal provided by the jamming detector is a false signal.

In the threshold calculation unit, the maximum power prediction value of the n-th input pulse calculated by the maximum power prediction value calculation unit and the parameters provided by the error correction unit are calculated.

The parameter output from the error correction unit is a value greater than “0” and is always a value greater than the absolute value of the prediction value calculated by the maximum power prediction value calculation unit.

The JTDLS high-speed anti-jamming terminal operates in high-speed pulse units to reflect a rapidly changing reception environment such as a high-speed maneuvering environment and an interference environment, and tens to hundreds of pulse signals are received within a short unit time. The reception pulse has a lot of information about the reception environment of the current transmission signal.

According to the present invention, the reception tendency of the received pulse signal is tracked and learned, and the range of the received signal optimized for the currently received signal is estimated.

Therefore, even if a signal contaminated with interference contaminates a part of the transmission signal and passes through the synchronization unit, interference cancellation can prevent the reception performance from being deteriorated due to the influence of the contaminated signal.

In addition, according to the present invention, since the JTDLS high-speed anti-jamming terminal needs to simultaneously receive signals generated by multiple transmitters, it is possible to improve detection accuracy of interference signals by reflecting each operating characteristic for each communication object. That is, due to the characteristics of a system operating with various platforms in a wide range of operating environments, when calculating a range of valid signals for the entire environment, the area where interference detection is possible is limited, and only a part of the target signal of the invention can be detected. .

The interference cancellation method presented in the present invention has the following differences from the conventional interference cancellation method.

When a method for removing interference in a wireless communication system is applied before a demodulation unit, it is necessarily applied after the synchronization unit in a synchronous manner, and as described in the background of the present invention, the signal passing through the synchronization unit has characteristics close to the target signal. Therefore, it is intended to improve and demodulate my signal by reflecting the characteristics of the estimated channel, such as an equalizer, as a signal for extracting my signal.

The present invention is different from the conventional method and purpose because it does not affect the judgment of the signal received at different frequencies by intentionally omitting it even though it has passed through the synchronization unit to exclude the effect of the contaminated signal in the repetitive transmission environment. Is clear.

The method of real-time application to the received signal through the signal strength suggested in the present invention has the following differences from the conventional method.

Since the JTDLS high-speed anti-jamming terminal is capable of 1:N communication in a TDL method, it is possible to receive several different signals at the same time. Therefore, it is necessary to be able to simultaneously receive signals at short and long distances, and even signals received at similar distances have different characteristics depending on the operating characteristics of the transmission platform.

Normally, signal strength estimation is not made by classifying the senders within the baseband. To reflect this in the next reception function based on the measured signal strength, it is used stepwise or proportionally, but is not selectively used for the reception signal.

The step of selectively using this is performed after analyzing demodulated data, that is, received information, that is, an output signal of the baseband.

The method in the present invention is distinct from the conventional method because it tracks a number of different received signals separately and tracks them in the baseband to reflect them in real time.

The accompanying drawings are provided to help understanding of the present embodiment, and provide embodiments together with a detailed description. However, the technical features of the present embodiment are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form a new embodiment.
1 is a diagram showing a reception level when a signal is normally received without an interference signal from a JTDLS terminal.
2 and 3 are diagrams showing constellations before and after repeated reception processing when a signal is normally received.
4 is a view showing a reception level when an interference signal is included and received in a received signal at a JTDLS terminal.
5 and 6 are diagrams showing constellations before and after repeated reception processing in the case of signal interference.
7 is a block diagram of an apparatus for removing interference signals in a JTDLS anti-jamming terminal according to the present invention.
8 is a diagram illustrating a detailed block configuration of the jamming detection and removal unit shown in FIG. 7.
9 is a view showing an operation flowchart for a method for removing interference signals in a JTDLS anti-jamming terminal according to the present invention

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are exemplified only for the purpose of explaining the embodiments of the present invention, and the embodiments of the present invention can be implemented in various forms, and It should not be construed as being limited to the described embodiments.

The present invention can be applied to various changes and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosure form, and it should be understood that all modifications, equivalents, and substitutes included in the spirit and scope of the present invention are included.

Terms such as first and second 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 other components. For example, the first component may be referred to as the second component without departing from the scope of the present invention, and similarly, the second component may also be referred to as the first component.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It 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 no other component exists in the middle.

Terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to indicate the existence of a disclosed feature, number, step, operation, component, part, or combination thereof, one or more other features or numbers, It should be understood that the presence or addition possibilities of steps, actions, components, parts or combinations thereof are not excluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in many different forms, and is not limited to the described embodiments. In addition, in order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals in the drawings indicate the same members.

Throughout the specification, when a part “includes” a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise specified. In addition, terms such as "... unit", "... group", "module", and "block" described in the specification mean a unit that processes at least one function or operation, which is hardware or software or hardware. And software.

First, the present invention seeks to improve the performance degradation of a system that will be caused by an interfering signal that has not been detected by the system. Here, the target signal for detection is a signal in which interference is generated in one pulse unit, which is a section from the frequency recognition to the next frequency recognition, and the interference corresponds to a signal strongly added after the synchronization unit.

When the interference signal is confirmed in the frequency recognition process, it does not transmit and strong interference occurs in the transmission section. In addition, since the correlation of the synchronization unit is lost, it does not pass, and if weak interference is made in the transmission section, the effect of interference is sufficiently attenuated during repeated reception processing.

Therefore, a signal that is strongly added after the synchronization part that is a part of the pulse, which is a case where the signal flows into the demodulator except for this case, corresponds to the object to be overcome.

The operation for detecting this will be described. The present invention detects an abnormal signal including interference by tracking the signal for each communication target by reflecting the relative navigation information between the transmitter and the receiver that can be checked and detected by the receiver, and the characteristics of the platform on which the transmitter is installed.

Reflecting the relative navigation information between the transmitter and the receiver, the direction, and the starting characteristics of the installed platform, the channel environment model of the received signal can be limited, so that the effective signal range currently input through the past received signal can be accurately estimated. .

The apparatus and method for removing an interference signal of a JTDLS anti-jamming terminal according to the present invention will be described in detail with reference to the accompanying drawings.

7 is a block diagram of an apparatus for removing interference signals in a JTDLS anti-jamming terminal according to the present invention.

As illustrated in FIG. 7, the apparatus for removing interference signals of a JTDLS anti-jamming terminal according to the present invention may include a synchronization unit 1100 and a demodulator 1200. Here, the synchronization unit 1100 and the demodulation unit 1200 may be included in the baseband system 1000.

In addition, the demodulator 1200 may include a decoder 1210 and a jamming detection and removal unit 1220.

The synchronization unit 1100 of the baseband system 1000 detects whether a signal is received, and when the signal is detected, corrects the characteristics of the signal through the detected parameters, and then the decoder 1210 of the demodulation unit 1200 To provide.

The decoder 1210 of the demodulation unit 1200 decodes the corrected received signal provided from the synchronization unit 1100, and then provides the decoded signal to the jamming detection and removal unit 1220.

The jamming detection and removal unit 1220 removes the detected interference signal and outputs it when detecting whether the received signal is interfering or not and detecting the interference signal from the signal decoded by the decoder 1210. That is, the jamming detection and removal unit 1220 removes the interference signal according to the relative distance from the transmission platform, the received frame error, and the previous received symbol, and then outputs the symbol with the interference removed.

As described above, a specific configuration and operation of the jamming detection and removal unit 1220 in the demodulation unit 1200 will be described in detail with reference to FIG. 8.

8 is a diagram illustrating a detailed block configuration of the jamming detection and removal unit 1220 illustrated in FIG. 7.

Referring to FIG. 8, the jamming detection and removal unit 1220 includes a buffer 1221, a first power measurement unit 1222, a jamming detection unit 1223, a threshold calculation unit 1224, and an error correction unit 1225. A power estimation unit 1226 and a second power measurement unit 1227 may be included.

The buffer 1221 stores the signal s[n] decoded from the decoder 1210, that is, the terminal reception signal, and waits for a result of the determination as to whether the signal has passed. Here, s[n] refers to an input pulse sequence at n time points of the received signal, and is a vector sequence as an IQ signal.

Meanwhile, the buffer 1221 determines whether to output the received signal s[n] according to the detection result signal r _dec [n] of the jamming signal (interference signal) of the jamming detection unit 1223.

The first power measuring unit 1222 measures the maximum power of the input pulse of the n time point with respect to the received received signal s[n], and the maximum power signal P _s[n] for the measured received signal _s[n] To the jamming detection unit 1223. That is, the first power measurement unit 1222 outputs to the jamming detection unit 1223 as a parameter value for determining whether the received signal s[n] has passed.

The second power measurement unit 1227 is the maximum power (p _s [n-1]) of the received signal at the n-1 time point stored in the buffer 1221, that is, the n-1 th pulse S[n-1]. Is calculated and provided to the maximum power prediction value calculation unit 1226.

Here, the second power measurement unit 1227 is the n-1 th pulse (s[n-1]) according to the demodulation result r _pe [n] of the demodulation unit 1220 for use only when the demodulation result is normal. Is to calculate the maximum power (p _s [n-1]).

The demodulation result r _pe [n] has two values, true and false. If no error is detected in the demodulation result of the nth pulse, the demodulation result r _pe [n] has a false value. , If an error is detected, it has a value of true.

Therefore, in the second power measurement unit 1227, the value of r _pe [n], which is the demodulation result, calculates the maximum power value only for the false value.

을 산출하고, 산출된 n번째 입력펄스의 최대 파워 예측값(

을 임계값 산출부(1224)로 제공한다. The maximum power prediction value calculation unit 1226 is a maximum power prediction value of the n-th input pulse (

Is calculated, and the maximum power prediction value of the calculated n-th input pulse (

Is provided to the threshold calculation unit 1224.

That is, the maximum power prediction value calculation unit 1226 updates the maximum power value (p _s [n-1]) of the n-1 th pulse measured by the second power measurement unit 1227 in units of pulses, that is, linear prediction It is calculated through, and the calculation method is as shown in Equation 4 below.

Then, the threshold calculation unit 1224 calculates a threshold value (p _th [n]) for determining signal interference and provides it to the jamming detection unit 1223.

과, 오차 보정부(1225)에서 제공되는 임계값 산출부(1224)에서 출력되는 임계값(p_th[n])의 오차 범위를 한정짓는 n번째 펄스에서의 매개 변수 값 α[n]을 이용하여 임계값을 산출한다. 여기서, 상기 임계값 산출부(1224)로 입력되는 n번째 입력펄스의 최대 파워 예측값(

은 임계값 산출부(1224)의 출력값인 임계값(p_th[n])의 기준값으로 활용된다. The threshold value calculation unit 1224 is a maximum power prediction value of the n-th input pulse calculated by the maximum power prediction value calculation unit 1226 (

And, using the parameter value α[n] in the nth pulse that defines the error range of the threshold value (p _th [n]) output from the threshold calculation unit 1224 provided by the error correction unit 1225 To calculate the threshold. Here, the maximum power prediction value of the n-th input pulse input to the threshold calculating unit 1224 (

Is used as a reference value of the threshold value p _th [n], which is an output value of the threshold calculation unit 1224.

과, 오차 보정부(1225)에서 제공되는 매개 변수값 α[n]을 이용하여 아래의 수학식 5를 이용하여 계산될 수 있다. 여기서, 최대 파워 예측값 산출부(1226)에서 출력되는 최대 파워 예측값(

과, 오차 보정부(1225)에서 제공되는 매개 변수값 α[n]은 반드시 "0"이상이 되며, 오차 보정부(1225)에서 제공되는 매개 변수값 α[n]은 -

보다 항상 큰 값이다. On the other hand, the threshold value (p _th [n]) output from the threshold calculating unit 1224 is the maximum power predicted value of the nth input pulse calculated by the maximum power predicting unit 1226 (

And, using the parameter value α [n] provided by the error correction unit 1225 may be calculated using the following equation (5). Here, the maximum power prediction value output from the maximum power prediction value calculation unit 1226 (

And, the parameter value α[n] provided by the error correction unit 1225 must be equal to or greater than “0”, and the parameter value α[n] provided by the error correction unit 1225 is −

It is always higher.

은 이전 펄스의 수신 경향으로부터 추정될 수 있다. 따라서, 기동특성이 반영되지 않은 예측은 빠른 기동변화 시 발산하며, 목적하는 기능을 수행하지 못할 뿐만 아니라 시스템의 성능마저 저해시킬 수 있다. The maximum power prediction value output from the maximum power prediction value calculation unit 1226 (

Can be estimated from the tendency to receive the previous pulse. Therefore, predictions that do not reflect maneuvering characteristics are divergent during a rapid maneuvering change, and are not able to perform the desired function and can even impair the performance of the system.

Accordingly, the error correction unit 1225 monitors and corrects it. That is, the error correction unit 1225 outputs a parameter for calculating the threshold value in the threshold calculation unit 1224, and the parameter is the maximum through the distance between the transmitter and the receiver, the starting characteristics, and the past data of the received pulse. The estimation error of the power prediction value calculation unit 1226 is corrected and compensated. Here, the correction means that the divergence is reflected by reflecting the maneuvering characteristics that are not reflected in the estimation, and the complementary meaning is adaptively adapting the error range generated by the maneuvering characteristics between platforms. It means reflecting in parameters.

That is, the error correcting unit 1225 is the effective maximum power train (P _n-1 ) of the received pulses up to n-1 provided from the maximum power prediction value calculating unit 1226 and the relative distance between the transmitter provided from the platform. The parameter α[n] can be output using (d _rel [n-1]). Here, the effective maximum power sequence (P _n-1 ) of the received pulses up to n-1 provided by the maximum power prediction value calculator 1226 is limited to information on m pulses from n-1.

The jamming detection unit 1223 determines whether the received signal is interfering. Here, the parameter used for the determination is received and updated in pulse units from the threshold calculation unit 1224 and applied. That is, the jamming detection unit 1223 has the maximum power value for the n-th pulse provided from the first power measurement unit 1222 and the threshold value p _th [provided by the threshold calculation unit 1224 for p _s[n] . After determining whether the n-th signal is interfering based on n], the determination signal r _det [n] is provided to the buffer 1221.

R _det [n] output from the jamming detector 1223 may have two values, true and false.

A true value is a case where signal interference is detected, and false means a case where signal interference is not detected.

Therefore, the buffer 1221 passes the stored received signal s[n] only when the signal interference determination signal r _det [n] output from the jamming detection unit 1223 is a false value. In FIG. 8, an output signal to which the determination of coral interference is applied is expressed as s _ft [n] to distinguish it from a signal to which determination is not applied.

Also, the signal interference determination signal r _det [n] output from the jamming detection unit 1223 is used to determine the cumulative number of data repeatedly received.

The method for removing the interference signal of the JTDLS anti-jamming terminal according to the present invention corresponding to the operation of the apparatus for removing the interference signal of the JTDLS anti-jamming terminal according to the present invention will be described step by step with reference to FIG.

9 is a view showing an operation flow chart for a method for removing interference signals in a JTDLS anti-jamming terminal according to the present invention.

Referring to FIG. 9, first, the decoded signal s[n] (referred to as the received signal s[n] of the terminal) decoded from the decoder 1210 is stored, and then the determination result of passing the signal is determined. Wait (S901). Here, s[n] refers to an input pulse sequence at a time point n of the received signal, and is in the form of a vector sequence as an IQ signal.

Subsequently, the first power measuring unit 1222 measures the maximum power of the input pulse of the n time point with respect to the input received signal s[n], and the maximum power signal p _s for the measured received signal s[n] _[n] is output to the jamming detection unit 1223 (S902), that is, the first power measurement unit 1222 is a parameter value for determining whether the received signal s[n] passes or not, the jamming detection unit 1223 Output as

In addition, in the second power measurement unit 1227, the maximum power (p _s [n-) of the received signal at the point of time n-1 stored in the buffer 1221, that is, the n-1 th pulse s[n-1]. 1]) is calculated and provided to the maximum power prediction value calculation unit 1226 (S903). Here, the second power measurement unit 1227 is the n-1 th pulse (S[n-1]) according to the demodulation result r _pe [n] of the demodulation unit 1220 for use only when the demodulation result is normal. Is to calculate the maximum power (P _s [n-1]).

On the other hand, the result of the demodulation r _pe [n] has two values, true and false. If no error is detected in the demodulation result of the nth pulse, the demodulation result r _pe [n] has a false value. It has a true value when an error is detected.

Therefore, in the second power measurement unit 1227, the value of r _pe [n], which is the demodulation result, calculates the maximum power value only for the false value.

을 산출하고, 산출된 n번째 입력펄스의 최대 파워 예측값(

을 임계값 산출부(1224)로 제공한다(S904). Subsequently, in the maximum power prediction value calculation unit 1226, the maximum power prediction value of the n-th input pulse (

Is calculated, and the maximum power prediction value of the calculated n-th input pulse (

Is provided to the threshold calculation unit 1224 (S904).

That is, the maximum power prediction value calculation unit 1226 updates the maximum power value P _s [n-1] of the n-1 th pulse measured by the second power measurement unit 1227 in units of pulses, that is, linearly. It is calculated through prediction, and the calculation method is as shown in Equation 4 above.

은 이전 펄스의 수신 경향으로부터 추정될 수 있다. 따라서, 기동특성이 반영되지 않은 예측은 빠른 기동변화 시 발산하며, 목적하는 기능을 수행하지 못할 뿐만 아니라 시스템의 성능마저 저해시킬 수 있다. The maximum power prediction value output from the maximum power prediction value calculation unit 1226 (

Can be estimated from the tendency to receive the previous pulse. Therefore, predictions that do not reflect maneuvering characteristics are divergent during a rapid maneuvering change, and are not able to perform the desired function and can even impair the performance of the system.

Accordingly, the error correction unit 1225 outputs the parameter α[n] for calculating the threshold value in the threshold calculation unit 1224, and the parameters are the distance between the transmitter and the receiver, the starting characteristics, and the reception. The estimation error of the maximum power prediction value calculation unit 1226 is corrected and compensated for through the past data of the pulse. Here, the correction means that the divergence is reflected by reflecting the maneuvering characteristics that are not reflected in the estimation, and the complementary meaning is adaptively adapting the error range generated by the maneuvering characteristics between platforms. It means reflecting in parameters.

That is, in the error correction unit 1225, the effective maximum power train P _n-1 of the received pulses up to n-1 provided from the maximum power prediction value calculating unit 1226 and the relative distance between the transmitter provided from the platform The parameter α[n] may be output using (d _rel [n-1]) (S905). Here, the effective maximum power sequence (P _n-1 ) of the received pulses up to n-1 provided by the maximum power prediction value calculator 1226 is limited to information on m pulses from n-1.

Subsequently, the threshold calculation unit 1224 calculates a threshold value P _th [n] for determining signal interference and provides it to the jamming detection unit 1223.

과, 오차 보정부(1225)에서 제공되는 임계값 산출부(1224)에서 출력되는 임계값(P_th[n])의 오차 범위를 한정짓는 n번째 펄스에서의 매개 변수 값 α[n]을 이용하여 임계값을 산출한다(S906). 여기서, 상기 임계값 산출부(1224)로 입력되는 n번째 입력펄스의 최대 파워 예측값(

은 임계값 산출부(1224)의 출력값인 임계값(p_th[n])의 기준값으로 활용된다. That is, in the threshold value calculation unit 1224, the maximum power prediction value of the n-th input pulse calculated by the maximum power prediction value calculation unit 1226 (

And, using the parameter value α[n] in the nth pulse that defines the error range of the threshold value P _th [n] output from the threshold calculation unit 1224 provided by the error correction unit 1225 To calculate the threshold (S906). Here, the maximum power prediction value of the n-th input pulse input to the threshold calculating unit 1224 (

Is used as a reference value of the threshold value p _th [n], which is an output value of the threshold calculation unit 1224.

과, 오차 보정부(1225)에서 제공되는 매개 변수값 α[n]을 이용하여 상기한 수학식 5를 이용하여 계산될 수 있다. 여기서, 최대 파워 예측값 산출부(1226)에서 출력되는 최대 파워 예측값(

과, 오차 보정부(1225)에서 제공되는 매개 변수값 α[n]은 반드시 "0"이상이 되며, 오차 보정부(1225)에서 제공되는 매개 변수값 α[n]은 -

보다 항상 큰값이다. On the other hand, the threshold value (p _th [n]) output from the threshold calculating unit 1224 is the maximum power predicted value of the nth input pulse calculated by the maximum power predicting unit 1226 (

And, it may be calculated using the above equation (5) using the parameter value α [n] provided by the error correction unit 1225. Here, the maximum power prediction value output from the maximum power prediction value calculation unit 1226 (

And, the parameter value α[n] provided by the error correction unit 1225 must be equal to or greater than “0”, and the parameter value α[n] provided by the error correction unit 1225 is −

It is always higher.

은 이전 펄스의 수신 경향으로부터 추정될 수 있다. 따라서, 기동특성이 반영되지 않은 예측은 빠른 기동변화 시 발산하며, 목적하는 기능을 수행하지 못할 뿐만 아니라 시스템의 성능마저 저해시킬 수 있다.In addition, the maximum power prediction value output from the maximum power prediction value calculation unit 1226 (

Can be estimated from the tendency to receive the previous pulse. Therefore, predictions that do not reflect maneuvering characteristics are divergent during a rapid maneuvering change, and are not able to perform the desired function and can even impair the performance of the system.

Subsequently, the jamming detection unit 1223 determines whether the received signal is interfering. Here, the parameter used for the determination is received and updated in pulse units from the threshold calculation unit 1224 and applied. That is, the jamming detection unit 1223 has the maximum power value for the n-th pulse provided from the first power measurement unit 1222 and the threshold value p _th [provided by the threshold calculation unit 1224 for p _s[n] . After determining whether the n-th signal is interfering based on n], the determination signal r _det [n] is provided to the buffer 1221 (S907).

R _det [n] output from the jamming detector 1223 may have two values, true and false. A true value is a case where signal interference is detected, and a false value means a case where signal interference is not detected.

Therefore, the buffer 1221 passes the stored received signal s[n] only when the signal interference determination signal r _det [n] output from the jamming detection unit 1223 is a false value (S908). In FIG. 8, an output signal to which the determination of coral interference is applied is expressed as s _ft [n] to distinguish it from a signal to which determination is not applied.

Meanwhile, the buffer 1221 determines whether to output the received signal s[n] according to the detection result signal r _dec [n] of the jamming signal (interference signal) of the jamming detection unit 1223.

Also, the signal interference determination signal r _det [n] output from the jamming detection unit 1223 is used to determine the cumulative number of data repeatedly received.

Even if all components constituting the embodiments of the present invention described above are described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the object scope of the present invention, all of the components may be selectively combined and operated. In addition, although all of the components may be implemented as one independent hardware, a part or all of the components are selectively combined to perform a program module that performs some or all functions combined in one or more hardware. It may be implemented as a computer program having a.

In addition, although the interference signal removal apparatus and method of the JTDLS anti-jamming terminal according to the present invention have been described according to embodiments, the scope of the present invention is not limited to a specific embodiment, and has ordinary knowledge in connection with the present invention. Various alternatives, modifications and changes can be carried out within the scope obvious to the person.

Therefore, the embodiments described in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings. . The scope of protection of the present invention should be interpreted by the claims, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

1000: baseband system
1100: synchronous part
1200: demodulator
1210: decoder
1220: Jamming detection and removal unit
1221: buffer
1222: first power measuring unit
1223: Jamming detection unit
1224: Threshold calculation unit
1225: error correction unit
1226: Maximum power predicted value calculator
1227: second power measuring unit

Claims (20)

In the interference signal removal apparatus of the JTDLS anti-jamming terminal,
A synchronization unit that detects whether a signal is received and corrects the characteristics of the signal through the detected parameters when the signal is detected;
A decoder which decodes the corrected received signal provided from the synchronization unit and then outputs the decoded signal; And
Jamming detection and removal to detect the interference with the received distance decoded by the decoder according to the relative distance from the transmission platform, the received frame error and the previous received symbol, remove the detected interference signal, and output the symbol with the interference removed. Including wealth,
The jamming detection and removal unit,
A buffer for storing the received signal decoded by the decoder and determining the output of the received signal according to an interference signal detection result;
A first power measuring unit measuring a maximum power value of an n-point input pulse for the received signal and outputting it as a signal for determining whether a received signal has passed as a parameter value;
A second power measuring unit for calculating a maximum power value for an n-1 th pulse for a received signal at a time n-1 stored in the buffer according to a system demodulation result signal;
a maximum power prediction value calculating unit calculating a maximum power value of the n-th input pulse;
Outputting a parameter for determining signal interference using the maximum effective power sequence of the received pulses from the maximum power prediction value calculated by the maximum power prediction value calculation unit to n-1 times and a relative distance from a transmitter provided from the platform. Error correction unit;
A threshold value calculating unit calculating a threshold value of jamming detection by using the maximum power prediction value of the n-th input pulse calculated by the maximum power prediction value calculation unit and parameters provided by the error correction unit; And
And a jamming detection unit for determining whether to interfere with the signal for the maximum power for the nth pulse measured by the first power measurement unit based on the threshold calculated by the threshold calculation unit, and then providing a determination signal as a buffer,
The second power measurement unit measures the maximum power only for a false value in which no error is detected as a result of demodulation of the nth pulse,
The threshold value calculation unit, the interference signal removal apparatus of the JTDLS anti-jamming terminal is calculated by the sum of the maximum power prediction value of the n-th input pulse calculated by the maximum power prediction value calculation unit and the parameters provided by the error correction unit .
delete delete According to claim 1,
The JTDLS term for calculating the maximum power prediction value for the n-th input pulse through linear prediction by updating the maximum power of the n-1th pulse measured by the second power measurement unit in units of pulses. Device for removing interference signals from jamming terminals.
According to claim 4,
The maximum power prediction value is calculated using the following equation: JTDLS anti-jamming terminal interference signal removal apparatus.
[Mathematics]

According to claim 1,
The error correction unit, the effective maximum power sequence of the received pulses from n-1 to 1 provided by the maximum power prediction value calculation unit is limited to information about m pulses from n-1 interference signal of the JTDLS anti-jamming terminal Removal device.
According to claim 1,
The jamming detection unit provides a true signal as a buffer when signal interference is detected, and provides a false signal as a buffer when signal interference is not detected.
The method of claim 7,
The buffer, the interference signal removal apparatus of the JTDLS anti-jamming terminal to pass the received signal stored only when the signal provided by the jamming detection unit is a false signal.
delete According to claim 1,
The parameter outputted from the error correction unit is a value greater than “0”, and is always a value greater than the absolute value of the prediction value calculated by the maximum power prediction value calculation unit.
In the interference signal removal method of the JTDLS anti-jamming terminal,
Detecting whether a signal is received through the synchronization unit, and correcting the characteristics of the signal through the detected parameter when the signal is detected;
Decoding the corrected received signal provided from the synchronization unit through a decoder; And
The jamming detection and removal unit detects the interference with the transmission platform, the received frame error, and the received signal decoded by the decoder according to the previous received symbol, removes the detected interference signal, and removes the interference symbol Including the step of outputting,
The step of outputting the symbol from which the interference has been removed,
storing the n-th received signal in a buffer;
Measuring, by the first power measuring unit, the maximum power value of the n-point input pulse for the received signal and outputting it as a signal for determining whether the received signal has passed as a parameter value;
Calculating, by the second power measuring unit, a maximum power value for the n-1 th pulse for the received signal at the time of n-1 stored in the buffer according to a system demodulation result signal;
Calculating a maximum power value of the n-th input pulse in the maximum power prediction value calculating unit;
In the error correction unit, for determining signal interference using the maximum effective power sequence of the received pulse from the maximum power prediction value calculated by the maximum power prediction value calculation unit to n-1 times, and the relative distance between the transmitter provided from the platform Outputting parameters;
Calculating a threshold value of jamming detection by using a maximum power prediction value of an n-th input pulse calculated by the maximum power prediction value calculation unit and a parameter provided by the error correction unit in a threshold calculation unit; And
In the jamming detection unit, determining whether there is signal interference for the maximum power for the nth pulse measured by the first power measurement unit based on the threshold value calculated by the threshold calculation unit, and then providing a determination signal as a buffer. Includes,
In the second power measurement unit, the maximum power is measured only for a false value in which no error is detected as a result of demodulation of the nth pulse,
The threshold value calculation unit, the maximum power prediction value of the n-th input pulse calculated by the maximum power prediction value calculation unit, and is calculated as the sum of the parameters provided by the error correction unit interference signal removal of the JTDLS anti-jamming terminal Way.
delete delete The method of claim 11,
JTDLS, in which the maximum power prediction value calculation unit calculates the maximum power prediction value for the nth input pulse through linear prediction by updating the maximum power of the n-1th pulse measured by the second power measurement unit in pulse units. Method for removing interference signal of anti-jamming terminal.
The method of claim 14,
The maximum power prediction value is calculated using the following equation: JTDLS anti-jamming terminal interference signal removal method.
[Mathematics]

The method of claim 11,
In the error correction unit, the effective maximum power sequence of the received pulses from n-1 to 1-1 provided from the maximum power prediction value calculating unit is limited to information on m pulses from n-1. How to remove the signal.
The method of claim 11,
The jamming detection unit provides a true signal as a buffer when signal interference is detected, and provides a false signal as a buffer when signal interference is not detected.
The method of claim 17,
In the buffer, the interference signal removal method of the JTDLS anti-jamming terminal to pass the received signal stored only when the signal provided by the jamming detection unit is a false signal.
delete The method of claim 11,
The parameter outputted from the error correction unit is a value greater than “0” and is always a value greater than the absolute value of the prediction value calculated by the maximum power prediction value calculation unit.

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