KR101405260B1 - Self calibration Method for Global Positioning System signal beamforming and Apparatus thereof - Google Patents

Abstract

The present invention relates to a GPS signal beamforming technique and, more specifically, to a method and device for beamforming after self-calibration by using only a GPS satellite signal outdoors without an additional calibration device. In order to achieve the task shown above, the present invention provides a self-calibration method for GPS signal beamforming to conveniently perform the beamforming technique without the installation and operation of the additional calibration device. According to the present invention, a weak satellite signal can be precisely measured by measuring the magnitude and phase with a tracking channel of a GPS receiver for self-calibration and differentiating and filtering the same.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a self calibration method and apparatus for GPS signal beamforming,

The present invention relates to GPS signal beamforming techniques, and more particularly, to a method and apparatus for performing beamforming after self calibration using only GPS satellite signals in the field without the aid of additional calibration equipment.

GPS is very vulnerable to interfering signals such as artificial jamming because the satellite signal structure is disclosed and transmitted over a long distance of more than 20,000 km. For example, the satellite signal reaching the GPS receiver is about -160 dBW (1 × 10 ^-16 Watt), whereas the mobile communication signal reaching the mobile phone is -60 dBW (1 × 10 ^-6 Watt) weak.

Therefore, it is very vulnerable to unintentional radio wave interference which may occur in RF application fields such as broadcasting / communication / electricity, and jamming signals that generate intentional radio wave signals.

As described above, the most effective way to cope with radio interference or jamming signals, which poses a serious threat to GPS, is a method of removing jamming signals using an array antenna.

An array antenna is a device that uses a plurality of antenna elements to increase the desired signal by changing the phase of each and reduce unwanted jamming signals.

In the array antenna system, an analog phase shifter is used to change the phase of the L band signal of the GPS to form a null in a specific direction to eliminate the jamming signal. Recently, as shown in FIG. 1, a digital array antenna system which realizes anti-jamming signal processing as a digital phase converter after A / D conversion at a low IF (Intermediate Frequency) is being developed.

1, a signal received by the antenna element 101 is converted into an intermediate frequency through a down-converter 102 and converted into an intermediate frequency by an A / D converter 103 at a low intermediate frequency (IF) A digital GPS array antenna system scheme for implementing anti-jamming signal processing through a digital phase converter 104 and a digital signal processor 106 after A / D conversion is shown.

A method of simply reducing the undesired jamming signal by changing the phase in the digital GPS array antenna is called nulling, and a method of increasing the desired signal while simultaneously reducing the undesired jamming signal is called beamforming.

Since the beamforming can increase the desired signal, the signal to noise ratio (SNR) of the GPS satellite can be improved and the satellite signal loss, which is a side effect of nulling, can be prevented.

However, since the array antenna system has a plurality of antenna elements and an RF stage, each of the gain and phase has a different problem. If the gain and phase of each element and the RF stage are different, a beam is formed in the other direction when beam forming is performed in a specific direction, and a desired result can not be obtained.

As described above, the beam forming in the array antenna system requires a calibration process in which the gain and the phase for each element and the RF stage are matched with each other. 2, calibration is performed by transmitting a radio wave signal in a desired direction using a calibration device 210, receiving the signal after RF termination, measuring the magnitude and phase of the signal, and using the calibrator 220 .

Such a method requires a calibration process from time to time because the signal varies with time and temperature, and it is troublesome and costly to transmit a radio wave signal by using an expensive radio wave transmission equipment equipped with an external calibration device 210 .

1. Korean Registered Patent No. 10-0978535 2. Korean Patent No. 10-1174716 3. Korean Patent Publication No. 10-2010-0081590 4. Korean Patent Publication No. 10-2010-0135594

The present invention provides a self-calibration method and apparatus for GPS signal beamforming, which can easily implement a beam forming technique without installing and operating a virtual calibration device. There is a purpose.

In addition, the present invention can be applied to a general GPS receiver capable of receiving only an existing antenna output, and it is also possible to perform a single beam forming that forms a beam only in a specific direction, thereby improving the utilization of the beam forming anti- It is another object to provide a self-calibrating method and apparatus for beamforming.

SUMMARY OF THE INVENTION The present invention provides a self calibration method for GPS signal beamforming that enables a simple beamforming technique to be implemented without the installation and operation of a voluntary calibration device.

The self-

A satellite signal receiving step of receiving a transmitted GPS satellite signal from a GPS (Global Positioning System);

A satellite signal conversion step of converting the transmitted GPS satellite signals to generate a plurality of converted GPS satellite signals;

A phase signal magnitude phase generation step of measuring the plurality of converted GPS satellite signals to generate a plurality of measured GPS satellite signal magnitudes and a measured GPS satellite signal phase;

A calibration value calculation step of calculating a difference between a plurality of measured GPS satellite signal magnitudes and a difference between a plurality of measured GPS satellite signal phases and calculating a calibration value using the calculated difference value;

A satellite signal calibration step of calibrating the plurality of converted GPS satellite signals using the calibration values; And

And generating a beamforming GPS satellite signal by summing the final GPS satellite signals generated by multiplying the corrected GPS satellite signals by weights.

The generating of the phase signal magnitude phase includes generating a plurality of GPS satellite signal magnitudes using the code tracking channel. And generating the plurality of measured GPS satellite signal phases using the phase tracking channel.

In addition, the calculated difference value may be a difference value of the plurality of tracking channels with respect to the reference channel.

The calibration value may be a value obtained by taking a product of a first difference value, which is a difference value between the measured GPS satellite signal magnitudes, and a second difference value, which is a difference value between the measured GPS satellite signal phases, as an inverse number .

Also, the weight may be generated using a beamforming algorithm.

The calibration value calculating step may further include removing noise of the calculated difference value using a low-pass filter.

Another embodiment of the present invention, on the other hand, comprises a plurality of antennas for receiving transmitted GPS satellite signals from a GPS; A signal converter for converting the transmitted GPS satellite signal to generate a plurality of converted GPS satellite signals; A plurality of tracking channels for measuring the plurality of transformed GPS satellite signals to produce a plurality of measured GPS satellite signal magnitudes and a measured GPS satellite signal phase, a plurality of measured GPS satellite signal magnitudes and a plurality of measured GPS satellite signal phases A calibration unit for calculating the difference and calculating a calibration value using the calculated difference value; an calibration unit for calibrating the plurality of converted GPS satellite signals using the calibration value; And a field formable gate array (FPGA) having a beam former for generating a beam forming GPS satellite signal by summing the final GPS satellite signals generated by multiplying the final GPS satellite signals by the weights, and a self-calibration device for GPS signal beamforming to provide.

Wherein each of the plurality of tracking channels comprises: a code tracking channel for generating a plurality of measured GPS satellite signal magnitudes; And a phase tracking channel for generating the plurality of measured GPS satellite signal phases.

Also, the weight may be generated using a beamforming algorithm.

The apparatus may further include a low-pass filter for removing noise of the calculated difference value.

On the other hand, another embodiment of the present invention is a self-calibrating apparatus for GPS signal beamforming that beamforms a satellite signal received from a highest elevation satellite, the apparatus comprising: a calibration unit for receiving and calibrating a satellite signal from the highest elevation- ; A single beamformer for synthesizing a single beamforming signal by performing only beamforming of the corrected satellite signal; And an RF (Radio Frequency) up-converter for up-converting the synthesized single beam forming signal.

According to the present invention, it is possible to precisely measure a weak satellite signal by measuring the magnitude and phase using the tracking channel of the GPS receiver for self-calibration and filtering the result after filtering.

Another advantage of the present invention is that signal-to-noise ratio can be increased by performing beamforming on a GPS satellite signal, and phase distortion and size loss can be prevented.

Further, as another effect of the present invention, beamforming for a general GPS receiver capable of receiving only an existing antenna output can be performed using a maximum elevation correction method, and single beam forming for forming a beam in a specific direction is also possible, The use of anti-jamming technology can be enhanced, which is useful because it can have a wide beam width as a small number of array antennas.

을 측정할 수 있는 일반적인 GPS 수신기의 코드 트랙킹 채널(Tracking channel)을 나타내는 회로 블럭도이다.
도 5는 도 3에 도시된 트랙킹 채널(311-1 내지 311-N) 중 위상

을 측정할 수 있는 일반적인 GPS 수신기의 위상 트랙킹 채널(Tracking channel)을 나타내는 회로 블럭도이다.
도 6은 본 발명의 일실시예에 따른 자체적으로 교정한 후 위성신호를 빔포밍하는 구성도이다.
도 7은 본 발명의 일실시예에 따른 기존 GPS 수신기에 적용 가능한 특정방향 빔포밍 장치의 구성도이다.
도 8은 본 발명의 일실시예에 따른 위성신호를 교정하여 빔포밍 위성신호를 생성하는 과정을 보여주는 흐름도이다.1 is a general digital type GPS anti-jamming array antenna system.
FIG. 2 is a block diagram of a calibration apparatus for GPS beamforming to which a general calibration method is applied.
3 is a block diagram of a self-calibration apparatus 300 using a GPS satellite signal according to an embodiment of the present invention.
Fig. 4 is a view showing the size of the tracking channels 311-1 to 311-N shown in Fig.

Which is a circuit block diagram showing a tracking channel of a general GPS receiver capable of measuring a GPS signal.
FIG. 5 is a timing chart showing the phase of the tracking channels 311-1 to 311-N shown in FIG.

In which the phase of the GPS signal is measured.
FIG. 6 is a diagram illustrating beamforming of a satellite signal after calibration according to an embodiment of the present invention.
7 is a configuration diagram of a specific direction beam forming apparatus applicable to an existing GPS receiver according to an embodiment of the present invention.
8 is a flowchart illustrating a process of generating a beamforming satellite signal by calibrating a satellite signal according to an embodiment of the present invention.

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.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

The present invention is characterized in that it self-calibrates using GPS satellite signals as shown in FIG. 3 without the aid of the additional calibration equipment shown in FIG. 3 is a block diagram of a self-calibration apparatus 300 using a GPS satellite signal according to an embodiment of the present invention.

In general, GPS satellite signals are less than thermal noise, which is a natural state noise, and can not be directly measured. In order to overcome this problem, the present invention uses a signal tracking algorithm used in a GPS receiver. First, the GPS satellite signal can be expressed by the following equation.

= 위성신호 크기,

= 의사잡음코드,

= 반송파 주파수,

= 위상이다. here,

= Satellite signal size,

= Pseudo noise code,

= Carrier frequency,

= Phase.

도 고정되었기 때문에

번째 안테나(330-1 내지 330-N) 및 신호 변환부(320-1 내지 320-N)를 통과하면 수학식 2와 같이 변환되어 변환 GPS 위성 신호가 생성된다. 여기서, 신호 변환부(320-1 내지 320-N)는 RF(Radio Frequency)단(미도시) 및 A/D(Analog/Digital) 컨버터(미도시) 등으로 구성된다. The GPS satellite signal is defined by an elevation angle (an angle at which an antenna looks at a GPS satellite) and an azimuth angle (indicating an antenna position and a hardness difference between GPS satellites)

Is also fixed

Th antennas 330-1 to 330-N and the signal converters 320-1 to 320-N, the converted GPS satellite signals are generated as shown in Equation (2). The signal converters 320-1 to 320-N include an RF (Radio Frequency) stage (not shown) and an A / D (analog / digital) converter (not shown).

는 각 RF 채널에서 입사되는 GPS 위성신호의 크기이고,

는 각 RF 채널에서 입사되는 GPS 위성신호의 위상을 나타낸다.here,

Is the magnitude of the GPS satellite signal incident on each RF channel,

Represents the phase of a GPS satellite signal incident on each RF channel.

을 측정하여 보상해줘야 한다. In order to perform beamforming in the GPS satellite direction or in a specific direction, the signal distortion terms of the antenna and the RF stage

Should be measured and compensated.

와 위상

을 측정할 수 있다. As described above, since the GPS satellite signal is weak, the size of the satellite signal incident on each RF channel through the despread gain obtained by multiplying the demodulated signal by the tracking channels 311-1 through 311-N of FIG.

And phase

Can be measured.

및 측정 GPS 위성신호 위상

을 생성하는 회로 블럭도가 도 4 및 도 5에 도시된다. 즉, 도 4는 도 3에 도시된 트랙킹 채널(311-1 내지 311-N) 중 크기

을 측정할 수 있는 일반적인 GPS 수신기의 코드 Tracking channel을 나타내고, 최종적으로 출력되는 값을 측정 위성신호 크기

로 표현한다. These measured GPS satellite signal magnitudes

And GPS satellite signal phase measurement

Are shown in Figs. 4 and 5. Fig. That is, FIG. 4 is a view showing the size of the tracking channels 311-1 to 311-N shown in FIG. 3

And the final output value is the measurement satellite signal size

.

을 측정할 수 있는 일반적인 GPS 수신기의 위상 Tracking channel을 나타내고, 최종적으로 출력되는 값을 위성신호 위상

로 표현한다. 도 4 및 도 5에 대하여는 후술하기로 한다.FIG. 5 is a timing chart showing the phase of the tracking channels 311-1 to 311-N shown in FIG.

And the last output value is the satellite signal phase

. 4 and 5 will be described later.

및 측정 GPS 위성신호 위상

은 안테나(330-1 내지 330-N) 및 RF단의 이득 및 위상이 반영된 값으로서 잡음이 크고 상대적인 값이다. 3, the measured GPS satellite signal magnitudes generated in the calibration value calculation units 313-1 through 313-N

And GPS satellite signal phase measurement

Is a value reflecting the gain and phase of the antennas 330-1 to 330-N and the RF stage, and has a large noise and a relative value.

,

)의 각각의 차이를 역수로 취한

,

의 역수값(

내지

)이 된다. 이를 보여주는 도면이 도 6에 도시된다, 도 6에 대하여는 후술하기로 한다.Therefore, as shown in FIG. 3, the difference value with respect to the reference channel is passed through a low pass filter 315 and is used as a calibration value in the calibration unit 317. That is, the calibration value is based on the measured GPS satellite signal magnitude and phase (

,

), Taking the inverse of each difference

,

The reciprocal of (

To

). The drawing showing this is shown in Fig. 6, which will be described later with reference to Fig.

=

-

,

=

-

,...이고,

=

-

,

=

-

...,이다.At this time, the first measured GPS satellite signal magnitude and the second measured GPS satellite signal magnitude produced by the first calibration value calculator 313-1 become the values of the reference channel. In other words,

=

-

,

=

-

,...ego,

=

-

,

=

-

...,to be.

Accordingly, the first measured GPS satellite signal magnitude and the first measured GPS satellite signal phase value, the second measured GPS satellite signal magnitude generated by the second calibration value calculator 313-2, and the second measured GPS satellite signal magnitude, The difference value of the phase is input to the low-frequency pass filter 315 and filtered.

The filtered measured GPS satellite signal magnitude and / or measured GPS satellite signal phase values are calibrated by the calibrator 317 and generated as a beamformed GPS signal at the beam former 319. This beamforming GPS signal is transmitted to the GPS receiver 350.

을 측정할 수 있는 일반적인 GPS 수신기의 코드 트랙킹 채널(Tracking channel)을 나타내는 회로 블럭도이다. 도 4를 참조하면, IF 신호와 EPL(470)의 해당값을 곱하는 다수의 곱셈기(400)와, 곱셈기(400)에 의해 생성된 신호를 적분 및 덤프하는 적분-덤프 회로(410)와, 코드 루프를 판별하여 측정 GPS 위성신호 크기

을 생성하는 코드 루프 판별기(430)와, 코드 루프가 있으면 이를 필터링하는 코드 루프 판별기(430)와, 코드를 위한 클럭 신호를 발진하는 코드 NCO(Numeric Controlled Oscillator)(450)와, 클럭 신호에 따라 코드를 생성하는 코드 발생기(460)와, 생성된 코드에 따라 구비된 데이터베이스에서 해당값을 출력하는 EPL(470) 등을 포함하여 구성된다.Fig. 4 is a view showing the size of the tracking channels 311-1 to 311-N shown in Fig.

Which is a circuit block diagram showing a tracking channel of a general GPS receiver capable of measuring a GPS signal. 4, there are a multiplier 400 for multiplying an IF signal and a corresponding value of the EPL 470, an integration-dump circuit 410 for integrating and dumping the signal generated by the multiplier 400, Loop is determined and measured GPS satellite signal size

A code loop detector 430 for filtering the code loop if it exists, a code numeric controlled oscillator (NCO) 450 for generating a clock signal for the code, A code generator 460 for generating a code according to the generated code, and an EPL 470 for outputting a corresponding value in a database provided according to the generated code.

Here, the EPL (Elint Parameter List) 470 comprises a database containing various electromagnetic characteristics of the allied and enemy groups.

을 측정할 수 있는 일반적인 GPS 수신기의 위상 트랙킹 채널(Tracking channel)을 나타내는 회로 블럭도이다. 도 5를 참조하면, IF 신호와 반송파 NCO(560)로부터의 Cosine 신소 및 Sine 신호를 각각 곱하는 2개의 곱셈기(500)와, 이 곱셈기(500)에 의해 생성된 신호를 누적 계산하는 누산기(510)와, 누적된 신호로부터 위상을 판별하여 측정 GPS 위성신호 위상

을 생성하는 위상 판별기(530)와, 위상 lock 루프가 있으면 이를 필터링하는 PLL(Phase Locked Loop) 필터(540)와, 2개의 곱셈기(500)에 분리된 I, Q신호로부터 Lock을 검출하는 검출기(520) 등을 포함하여 구성된다.FIG. 5 is a timing chart showing the phase of the tracking channels 311-1 to 311-N shown in FIG.

In which the phase of the GPS signal is measured. 5, there are two multipliers 500 for multiplying the IF signal with the cosine sine and sine signals from the carrier NCO 560, an accumulator 510 for accumulating the signals generated by the multiplier 500, And a GPS satellite signal phase

A PLL (Phase Locked Loop) filter 540 for filtering the phase lock loop if there is a phase lock loop, a detector 540 for detecting lock from the I and Q signals separated by the two multipliers 500, (520), and the like.

내지

)(610-1 내지 610-N)과 변환 GPS 위성신호(s_k1 내지 s_kN)를 곱하여 안테나 및 RF단의 이득 및/또는 위상을 교정한 교정 GPS 위성신호를 생성한다. 부연하면, 교정부(317)에서 측정 GPS 위성신호 역수값(610-1 내지 610-N)과 변환 GPS 위성신호(s_k1 내지 s_kN)를 곱함으로써 교정 GPS 위성신호(

내지

)가 생성된다.FIG. 6 is a diagram illustrating beamforming of a satellite signal after calibration according to an embodiment of the present invention. That is, FIG. 6 shows a calibration and beamforming process. The calibration values (FIGS. 4 and 5)

To

) 610-1 through 610-N and the converted GPS satellite signals s _k1 through s _kN to produce a calibration GPS satellite signal that calibrated the gain and / or phase of the antenna and RF stage. The calibration unit 317 multiplies the measured GPS satellite signal reciprocal values 610-1 through 610-N by the converted GPS satellite signals s _k1 through s _kN to obtain a calibration GPS satellite signal

To

) Is generated.

Of course, the converted GPS satellite signal is the GPS satellite signal converted as shown in Equation (2) while passing through the antennas 330-1 to 330-N and the signal converters 320-1 to 320-N.

와 교정 GPS 위성신호(

내지

)를 곱하여 최종 GPS 위성신호(

내지

)를 산출한다. 이후, 합산기(630)는 이러한 최종 GPS 위성신호를 합하여 빔형성된 빔형성 GPS 위성신호를 생성한다. 여기서, 빔포밍 알고리즘은 아래 수학식 3 및 4와 같은 최적해 문제의 해이다.The multipliers 600-1 to 600-N multiply the weight vectors generated by the weight vector generator 640 and the steering vector machine 650, which are components of the beamforming algorithm,

And calibration GPS satellite signals (

To

) To obtain the final GPS satellite signal (

To

). The summer 630 then combines these final GPS satellite signals to generate a beamformed beamforming GPS satellite signal. Here, the beamforming algorithm is a solution of the optimal solution problem expressed by the following equations (3) and (4).

Where R _xx is a correlation matrix of digital converted values of each channel and T is a transpose. The weight w is a value that minimizes the value of w (T) Rxxw while being limited to the steering vector C and the limit value F.

When the beamformed satellite signal is transmitted to the GPS receiver by the above algorithm, the signal-to-noise ratio becomes large, and phase distortion and signal size loss can be prevented.

7 is a configuration diagram of a specific direction beam forming apparatus applicable to an existing GPS receiver according to an embodiment of the present invention. In addition, the beamforming for a general GPS receiver capable of receiving only the conventional antenna output is a configuration diagram for implementing.

7, the satellite signal is received from the highest elevation angle satellite 700, and the calibration is performed in the calibration unit 710 to perform beamforming only in the single beamformer 720 to synthesize a single beamforming signal, Up converter 730 and interworks with the existing GPS receiver 740.

In general, the GPS anti-jamming device having 7 or less arrays has a wide beam at the time of beamforming, so that it can receive many GPS satellite signals inputted from various angles.

8 is a flowchart illustrating a process of generating a beamforming satellite signal by calibrating a satellite signal according to an embodiment of the present invention. Referring to FIG. 8, a GPS satellite signal is received from a GPS (Global Positioning System), and the converted GPS satellite signal is converted to generate a plurality of converted GPS satellite signals (steps S800 and S810). In other words, the satellite signals received from the GPS are converted through the antennas 330-1 to 330-N and the signal change units 320-1 to 320-N shown in FIG.

Thereafter, the plurality of converted GPS satellite signals are measured using the tracking channels 311-1 to 311-N to generate a plurality of measured GPS satellite signal magnitudes and a measured GPS satellite signal phase (step S820). Of course, the measured GPS satellite signal magnitude at this time uses the code tracking channel shown in FIG. 4, and the measured GPS satellite signal phase is generated using the phase tracking channel shown in FIG.

When the GPS satellite signal magnitude and phase are calculated, a difference between the plurality of measured GPS satellite signal magnitudes and a difference between a plurality of measured GPS satellite signal phases is calculated, and a calibrated value is calculated using the calculated difference value (step S830) .

When the calibration value is calculated, the calibration unit 317 calibrates the plurality of converted GPS satellite signals using the calibration value (step S830).

At the same time, there is a process of calculating a weight using a beam forming algorithm (step S850). The weight calculation process may be calculated and stored in advance.

When the weight is calculated, the beam former 319 multiplies the corrected GPS satellite signal by a weight, and then combines the final GPS satellite signal to generate a beamforming GPS satellite signal (step S860).

101, 330-1 to 330-N: antennas
102: RF down converter
103: A / D converter
104: Digital phase converter
105, 350: GPS receiver
106: digital signal processing processor
210: calibration equipment 220: calibrator
300: Self-calibrating device
310: Field Programmable Gate Array (FPGA)
311-1 to 311-N: a tracking channel
313-1 to 313-N: Calibration value calculating section
315: Low-frequency pass filter
317: Calibration 319: Beamformer
320-1 to 320-N:
400, 500, 600-1 to 600-N: multiplier
410: integral-dump circuit
420, 520: Lock detector
430: code loop discriminator 440: code loop filter
450: Code NCO (Numeric Controlled Oscillator)
460: Code generator
470: Elint Parameters List (EPL)
510: Accumulator 520: Carrier NCO
530: Phase discriminator
540: PLL (Phase Locked Loop)
630:
640: weight generator 650: steering vector machine

Claims (13)

A satellite signal receiving step of receiving a transmitted GPS satellite signal from a GPS (Global Positioning System);
A satellite signal conversion step of converting the transmitted GPS satellite signals to generate a plurality of converted GPS satellite signals;
A phase signal magnitude phase generation step of measuring the plurality of converted GPS satellite signals to generate a plurality of measured GPS satellite signal magnitudes and a measured GPS satellite signal phase;
A calibration value calculation step of calculating a difference between a plurality of measured GPS satellite signal magnitudes and a difference between a plurality of measured GPS satellite signal phases and calculating a calibration value using the calculated difference value;
A satellite signal calibration step of calibrating the plurality of converted GPS satellite signals using the calibration values; And
Generating a beamforming GPS satellite signal by summing the final GPS satellite signals generated by multiplying the corrected GPS satellite signals by weights;
Wherein the GPS signal beamforming method comprises the steps < RTI ID = 0.0 > of: < / RTI >
The method according to claim 1,
Generating the phase signal magnitude phase comprises: generating a plurality of measured GPS satellite signal magnitudes using a code tracking channel; And generating the plurality of measured GPS satellite signal phases using a phase tracking channel. ≪ Desc / Clms Page number 19 >
The method according to claim 1,
Wherein the calculated difference value is a difference value with respect to a reference channel among the plurality of tracking channels.
The method of claim 3,
Wherein the calibration value is a value obtained by taking a product of a first difference that is a difference between the measured GPS satellite signal magnitudes and a second difference value that is a difference between the measured GPS satellite signal phases as a reciprocal of the GPS signal beamforming A self calibration method for.
The method according to claim 1,
Wherein the weight is generated using a beamforming algorithm. ≪ RTI ID = 0.0 > 8. < / RTI >
The method according to claim 1,
Wherein the calibrating value calculating step further comprises removing noise of the calculated difference value using a low frequency pass filter.
A plurality of antennas for receiving transmitted GPS satellite signals from GPS;
A signal converter for converting the transmitted GPS satellite signal to generate a plurality of converted GPS satellite signals;
A plurality of tracking channels for measuring the plurality of transformed GPS satellite signals to produce a plurality of measured GPS satellite signal magnitudes and a measured GPS satellite signal phase, a plurality of measured GPS satellite signal magnitudes and a plurality of measured GPS satellite signal phases A calibration unit for calculating the difference and calculating a calibration value using the calculated difference value; an calibration unit for calibrating the plurality of converted GPS satellite signals using the calibration value; An FPGA (Field Programmable Gate Array) having a beamformer for multiplying a final weighted GPS satellite signal by a weight and generating a beamforming GPS satellite signal;
And a self-calibration device for GPS signal beamforming.
8. The method of claim 7,
Each of the plurality of tracking channels comprising: a code tracking channel for generating a plurality of measured GPS satellite signal magnitudes; And a phase tracking channel for generating the plurality of measured GPS satellite signal phases.
8. The method of claim 7,
Wherein the calculated difference value is a difference value with respect to the reference channel among the plurality of tracking channels.
10. The method of claim 9,
Wherein the calibration value is a value obtained by taking a product of a first difference that is a difference between the measured GPS satellite signal magnitudes and a second difference value that is a difference between the measured GPS satellite signal phases as a reciprocal of the GPS signal beamforming A self-calibrating device for.
8. The method of claim 7,
Wherein the weight is generated using a beamforming algorithm. ≪ RTI ID = 0.0 > 8. < / RTI >
8. The method of claim 7,
And a low-pass filter for removing the noise of the calculated difference value.
A self-calibrating device for GPS signal beamforming for beamforming a satellite signal received from a highest elevation satellite,
A calibration unit for receiving and calibrating a satellite signal from the highest elevation satellite;
A single beamformer for synthesizing a single beamforming signal by performing only beamforming of the corrected satellite signal; And
And an RF (Radio Frequency) up-converter for up-converting the synthesized single beam forming signal.

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