KR20160107740A - Anti-jamming signal processing apparatus and method using a dual-polarized antenna - Google Patents

Abstract

The present invention relates to an anti-jamming technique and, more specifically, relates to an apparatus and a method of dual polarized single antenna anti jamming which obtains a certain level of radio wave disturbance counteracting performance by a relatively low volume when compared with a general array antenna technique. According to the present invention, the certain level of radio wave disturbance counteracting performance is able to be obtained even by a relatively low volume when compared with a general array antenna technique. The apparatus for dual polarized single antenna anti jamming comprises: a signal receiving unit receiving a satellite navigation signal through a dual polarized single antenna; a signal converting unit converting the received navigation signal into a digital navigation signal; a signal storing unit storing the converted digital navigation signal; and a signal processing unit diminishing a disturbing signal in a space and a frequency region of the stored digital navigation signal using a finite impulse response (FIR) filter.

Description

[0001] The present invention relates to an anti-jamming signal processing apparatus and a dual-polarized antenna,

The present invention relates to an anti-jamming technique, and more particularly, to a dual-polarized single antenna anti-jamming device and method capable of achieving a certain level of propagation disturbance performance even in a smaller volume compared to a general array antenna technique.

Satellite navigation systems, including GPS (Global Positioning System), are essential infrastructure of modern times, and guide the route to the current location and destination. However, the navigation signal transmitted from the satellite has a weak reception intensity at the terrestrial receiver, so that there is a disadvantage that the position accuracy of the receiver is significantly degraded or the acquisition and / or tracking of the navigation signal becomes impossible at the time of radio disturbance.

One of the ways to compensate for these drawbacks is the anti - jamming signal processing technique using array antennas. The array antenna scheme can overcome the vulnerability to radio interference by stably receiving the satellite navigation signal and attenuating the disturbance signal by assigning appropriate weights to the signals received from the multiple antennas.

However, in the array antenna anti-jamming signal processing technique, the volume and / or cost of the system is inevitably increased due to a plurality of antennas and / or accompanying hardware, and thus the application range of a small unmanned system is limited .

1. Korean Patent No. 10-1405126

1. Jeong, Tae-hee, "Performance Analysis of Adaptive Array Antenna for GPS Anti-jamming" Journal of Military Science and Technology, Vol. 16, No. 3, No. 64, June 2013, pp.382-389. 2. Kim, Ki-Yoon, "Analysis of Anti-Jamming Technique for Satellite Navigation System" Journal of the Korean Institute of Communication Sciences, Vol. 38C No. 12 (December 2013) - Fusion Technology pp.1216-1227

The present invention provides a dual polarization single antenna anti-jamming apparatus and method that can achieve a level of propagation disturbance corresponding to a smaller volume than a conventional array antenna technique, It has its purpose.

It is another object of the present invention to provide a dual polarization single antenna anti-jamming apparatus and method that can be applied to a system having a limited mounting weight such as a small unmanned aerial vehicle.

The present invention provides a dual polarization single antenna anti-jamming device capable of achieving a certain level of propagation disturbance performance even in a smaller volume than a conventional array antenna technique in order to achieve the above-described problems.

Wherein the dual polarization single antenna anti-jamming device comprises:

A signal receiving unit for receiving a satellite navigation signal through a dual polarization single antenna;

A signal converter for converting the received navigation signal into a digital navigation signal;

A signal storage unit for storing the converted digital navigation signal; And

And a signal processing unit for attenuating the disturbance signal in the spatial and frequency domain of the digital navigation signal stored using the finite impulse response filter (FIR).

The weight of each tap of the finite impulse response filter may be calculated according to the angle of incidence of the satellite navigation signal and the disturbance signal through an MVDR (Minimum Variance Distortionless Response) algorithm to which a dual polarization single antenna model is applied.

subject to

(여기서,

,

,

, S는 제약 벡터(constraint vector)이고, R은 수신신호의 공분산 행렬이고, W^H는 가중치 벡터, w^* _R1....w^* _RM은 우회전 원편파(RHCP:Right Hand Circularly Polarized) 성분 신호의 가중치이고, w^* _L1...w^* _LM은 좌회전 원편파(LHCP:Light Hand Circularly Polarized) 성분 신호의 가중치이고, E는 평균값, X는 수신신호 벡터, x_R1...x_RM은 수신신호의 RHCP 성분 신호이고, x_L1...x_LM은 수신신호의 LHCP 성분 신호이고, T는 전치(Transpose) 연사자이고, H는 에르미트(Hermitian) 연사자이다로 정의되는 것을 특징으로 할 수 있다.Further, the MVDR algorithm can be expressed by Equation

subject to

(here,

,

,

, S is a vector constraints (constraint vector) and, R is a covariance matrix of the received signal, W ^H is the weight vector, w .... w ^* _R1 ^* _RM is right circular polarization (RHCP: Right Hand Circularly Polarized) component signal and a weight, w ^* _L1 ... w ^* _LM is left circular polarization: and (LHCP Hand Circularly polarized Light) weight of the component signal, E is the mean value, X is the received signal vector, x x _R1 ... _RM are received a RHCP signal component of the signal, x ... x _{L1 LM} is a LHCP signal component of the received signal, T is also characterized in that a preamplifier (transpose) dead soft, H is defined as the Hermitian (Hermitian) open lion .

(여기서,

는 위성항법신호의 입사각으로써 위성항법신호의 항법데이터로부터 얻어지는 값이다)으로 정의되는 것을 특징으로 할 수 있다.Also,

(here,

Is a value obtained from the navigation data of the satellite navigation signal as an incident angle of the satellite navigation signal).

In addition, the weight may be calculated through a Lagrange multiplier.

으로 정의되는 것을 특징으로 할 수 있다.In addition, the Langmuir-number multiplication method can be expressed by the following equation

As shown in FIG.

In the attenuation of the disturbance signal, a null is formed in the incident angle direction of the disturbance signal by applying the weight to each tap of the finite impulse response filter, and a notch is formed in the center frequency band of the disturbance signal And the second electrode is formed.

On the other hand, another embodiment of the present invention is a method for receiving a satellite navigation signal, comprising: receiving a satellite navigation signal through a dual polarization single antenna; Converting the received navigation signal into a digital navigation signal; Storing the digital navigation signal converted by the signal storage unit; And a step of attenuating the disturbance signal in the spatial and frequency domain of the digital navigation signal stored using the finite impulse response filter (FIR) of the signal processing unit. to provide.

According to the present invention, a certain level of propagation disturbance corresponding performance can be obtained even with a smaller volume compared with a general array antenna technique.

Another advantage of the present invention is that the present invention can be applied to a system having a limited mounting weight such as a small unmanned aerial vehicle.

FIG. 1 is a configuration diagram of a dual polarization single antenna anti-jamming device 100 for dual polarization single antenna anti-jamming signal processing according to an embodiment of the present invention.
FIG. 2 is a block diagram of a Finite-Impulse-Response (FIR) filter in the signal processing unit 121 shown in FIG.
3 is a flowchart illustrating a process of receiving a satellite navigation signal and attenuating a disturbance signal according to an embodiment of the present invention.
FIG. 4 is a flow chart showing in detail the disturbance signal attenuation step (S340) shown in FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. 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 a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

Hereinafter, an apparatus and method for dual polarization single antenna anti-jamming according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of a dual polarization single antenna anti-jamming device 100 for dual polarization single antenna anti-jamming signal processing according to an embodiment of the present invention. Referring to FIG. 1, the dual polarization single antenna anti-jamming apparatus 100 includes a signal collector 110 for collecting signals and a signal processor 120 for receiving the collected signals and attenuating the disturbance signals.

The signal collector 110 includes a signal receiving unit 111 for receiving a satellite navigation signal through a dual polarized single antenna (not shown), a converting unit 113 for converting the received navigation signal into a digital navigation signal, And a storage unit 115 for storing the data.

The storage unit 115 may be a flash memory (SSD), a hard disk drive, a flash memory, an electrically erasable programmable read-only memory (EEPROM), a static random access memory (SRAM), a ferro- Volatile memory such as a phase-change RAM, an MRAM (Magnetic RAM), and / or a volatile memory such as a DRAM (Dynamic Random Access Memory), an SDRAM (Synchronous Dynamic Random Access Memory), a DDR-SDRAM (Double Date Rate- Memory. ≪ / RTI >

The signal processor 120 includes a signal processing unit 121 for attenuating a disturbance signal in a spatial and frequency domain of a digital navigation signal stored using a finite impulse response filter (FIR).

A dual polarized single antenna is an antenna that functions to receive vertical polarization and horizontal polarization. In general, the satellite navigation signal transmitted from the GPS satellite has a disadvantage in that the intensity of the signal received by the GPS receiver on the ground is so weak that it is vulnerable to intentional and / or unintentional interference signals. Such an interference signal may not only reduce the position accuracy of the GPS receiver but also make it impossible to acquire and track the satellite navigation signal.

Therefore, in one embodiment of the present invention, the signal applied to the dual polarization single antenna is modeled as a function of the incident angle according to the polarization characteristic of each signal, and the optimal weight vector is calculated by applying a MVDR (Minimum Variance Distortionless Response) algorithm. The calculated weight vector attenuates the influence of the interference signal by forming a null in the direction of the interference signal.

FIG. 2 is a block diagram of a Finite-Impulse-Response (FIR) filter in the signal processing unit 121 shown in FIG. Referring to FIG. 2, the FIR filter includes a Right Hand Circular Polarized (FIR) filter 220 and a Left Hand Circular Polarized (LHCP) FIR filter 230, and a signal generated by the RHCP FIR filter and the LHCP FIR filter And a final summing unit 240 for synthesizing the output signals to generate an output signal.

)를 곱하는 탭(223), 각 신호들을 합산하는 합산기(225) 등을 포함하여 구성된다.The RHCP FIR filter 220 includes a delayer 221 for giving a delay value (z- ¹ ) to the right-hand circularly polarized signal (x _R1 ... x _RM ), a weight

), A summer 225 for summing the signals, and the like.

)를 곱하는 탭(233), 각 신호들을 합산하는 합산기(235) 등을 포함하여 구성된다.Similarly, the LHCP FIR filter 230 includes a delayer 321 that gives a delay value z ^-1 to the left-handed circular polarization signal x _L1 ... x _LM ,

), A summer 235 for summing the signals, and the like.

The weights of the respective tapes 223 and 233 are calculated according to the incidence angles of the satellite navigation signal and the disturbance signal through a MVDR (Minimum Variance Distortionless Response) algorithm using a dual polarization single antenna model.

The MVDR algorithm for calculating the weights is as follows.

[Equation 1]

subject to

minimize

subject to

,

,

이다.here,

,

,

to be.

In addition, S is a vector constraints (constraint vector) and, R is a covariance matrix of the received signal, W ^H is the weight vector, w .... w ^* _R1 ^* _RM is right circular polarization (RHCP: Right Hand Circularly Polarized) component and the weight of the signal, w ^* _L1 ... w ^* _LM is left circular polarization: and (LHCP Hand Circularly polarized Light) weight of the component signal, E is the mean value, X is the received signal vector, x x _R1 ... _RM are Where x _L1 ... x _LM is the LHCP component signal of the received signal, T is the transpose operator, and H is the Hermitian operator.

In particular, the weights satisfying Equation (1) are calculated through the Lagrange Multiplier.

&Quot; (2) "

Then, by applying the calculated weights to the RHCP FIR filter 220 and the LHCP FIR filter 230, null is formed in the incident angle direction of the disturbance signal, a notch is formed in the center frequency band of the disturbance signal, The effect is attenuated. Since the MVDR algorithm minimizes the received signal power and maintains the gain of 1 at the incidence angle of the satellite navigation signal, when the disturbance signal of strong intensity is input compared to the satellite navigation signal, the gain of the disturbance signal is lowered, As a result, null is formed in the incident angle direction of the disturbance signal, and notch is formed in the frequency band of the disturbance signal. Since the notch formed in the frequency band means having a very low frequency response in the corresponding band, the received disturbance signal attenuates its influence while passing through the FIR.

3 is a flowchart illustrating a process of receiving a satellite navigation signal and attenuating a disturbance signal according to an embodiment of the present invention. Referring to FIG. 3, a signal receiving unit (111 in FIG. 1) receives a satellite navigation signal through a dual polarization single antenna (step S310).

When the satellite navigation signal is received, the signal converter (113 in FIG. 1) converts the received navigation signal into a digital navigation signal and stores the converted digital navigation signal in the signal storage unit (115 in FIG. 1) , S340).

Thereafter, the signal processing unit 121 of FIG. 1 attenuates the disturbance signal in the space and / or the frequency domain of the digital navigation signal stored using the finite impulse response filter (FIR) (step S340).

FIG. 4 is a flow chart showing in detail the disturbance signal attenuation step (S340) shown in FIG. Referring to FIG. 4, weights to be applied to the taps 223 and 233 of the FIR filters 220 and 230 are calculated, and the calculated weights are applied to the FIR filter (steps S410 and S420).

Thereafter, a null is formed in the incident angle direction of the disturbance signal, and a notch is formed in the center frequency band of the disturbance signal (steps S430 and S440).

100: Dual polarized single antenna anti-jamming device
110: Signal collector
111: Satellite navigation signal receiver
113: Signal conversion section
120: Signal processor
121: Signal processor
210: Dual polarized antenna
220: Right Hand Circular Polarized (RHCP) Finite Impulse Response (FIR) filter
221,231: retarder
223, 233:
225,235:
230: Left Hand Circular Polarized (LHCP) Finite Impulse Response (FIR) filter
240: Final totalizer

Claims (8)

A signal receiving unit for receiving a satellite navigation signal through a dual polarization single antenna;
A signal converter for converting the received navigation signal into a digital navigation signal;
A signal storage unit for storing the converted digital navigation signal; And
A signal processor for attenuating a disturbance signal in a spatial and frequency domain of a digital navigation signal stored using a finite impulse response filter (FIR);
Wherein the dual-polarized single-antenna anti-jamming device comprises:
The method according to claim 1,
Wherein a weight of each tap of the finite impulse response filter is calculated according to an incident angle of a satellite navigation signal and a disturbance signal through an MVDR (Minimum Variance Distortionless Response) algorithm using a dual polarization single antenna model. Jamming device.
3. The method of claim 2,
The MVDR algorithm can be expressed as Equation

subject to

(here,

,

,

, S is a vector constraints (constraint vector) and, R is a covariance matrix of the received signal, W ^H is the weight vector, w .... w ^* _R1 ^* _RM is right circular polarization (RHCP: Right Hand Circularly Polarized) component signal and a weight, w ^* _L1 ... w ^* _LM is left circular polarization: and (LHCP Hand Circularly polarized Light) weight of the component signal, E is the mean value, x is the received signal vector, x x _R1 ... _RM are received a RHCP signal component of the signal, x ... x _{L1 LM} is a LHCP signal component of the received signal, T is the transpose (transpose) dead soft, H is characterized in that which is defined as the Hermitian (Hermitian) open lion Dual polarized single antenna anti - jamming device.
The method of claim 3,
The above S is expressed by the following equation

(here,

Is a value obtained from the navigation data of the satellite navigation signal as an incident angle of the satellite navigation signal).
The method of claim 3,
Wherein the weight is calculated by a Lagrange Multiplier. ≪ RTI ID = 0.0 > 11. < / RTI >
6. The method of claim 5,
The Lagrange multiplier method can be expressed by the following equation

Wherein the antenna is defined as a single-pole single-antenna anti-jamming device.
3. The method of claim 2,
In the attenuation of the disturbance signal, a null is formed in the incident angle direction of the disturbance signal by applying the weight to each tap of the finite impulse response filter, and a notch is formed in the center frequency band of the disturbance signal Wherein the first and second polarized single-antenna anti-
Receiving a satellite navigation signal through a dual polarization single antenna;
Converting the received navigation signal into a digital navigation signal;
Storing the digital navigation signal converted by the signal storage unit; And
And a step of attenuating the disturbance signal in a spatial and frequency domain of the digital navigation signal stored by using the finite impulse response filter (FIR) of the signal processing unit.

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