KR101554287B1 - Apparatus for correcting amplitude and phase for multi-mode mono pulse antenna using pilot signals - Google Patents

Apparatus for correcting amplitude and phase for multi-mode mono pulse antenna using pilot signals Download PDF

Info

Publication number
KR101554287B1
KR101554287B1 KR1020140062189A KR20140062189A KR101554287B1 KR 101554287 B1 KR101554287 B1 KR 101554287B1 KR 1020140062189 A KR1020140062189 A KR 1020140062189A KR 20140062189 A KR20140062189 A KR 20140062189A KR 101554287 B1 KR101554287 B1 KR 101554287B1
Authority
KR
South Korea
Prior art keywords
amplitude
phase
signal
signals
value
Prior art date
Application number
KR1020140062189A
Other languages
Korean (ko)
Inventor
권건섭
허종완
황기민
Original Assignee
국방과학연구소
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 국방과학연구소 filed Critical 국방과학연구소
Priority to KR1020140062189A priority Critical patent/KR101554287B1/en
Application granted granted Critical
Publication of KR101554287B1 publication Critical patent/KR101554287B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/02—Waveguide horns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The present invention relates to an amplitude phase correction technique for a monopulse antenna, and more particularly, to an amplitude phase correction technique for a monopulse antenna. More particularly, the present invention relates to an amplitude phase correction technique for a monopulse antenna, The present invention relates to an apparatus and method for amplitude phase correction for a multimode monopulse antenna that corrects amplitude and phase in real time using a pilot signal in addition to a fundamental mode signal and a higher-order mode signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for correcting an amplitude phase of a multi-mode monopulse antenna using a pilot signal,

The present invention relates to an amplitude phase correction technique for a monopulse antenna, and more particularly, to an amplitude phase correction technique for a monopulse antenna. More particularly, the present invention relates to an amplitude phase correction technique for a monopulse antenna, The present invention relates to an apparatus and method for amplitude phase correction for a multimode monopulse antenna that corrects amplitude and phase in real time using a pilot signal in addition to a fundamental mode signal and a higher-order mode signal.

It is necessary to have a satellite tracking system in order to track the satellite moving in the real-time satellite tracking or satellite communication in the high-speed mobile body and the satellite moving in the stationary satellite earth station. The satellite automatic tracking method requires higher tracking accuracy as the frequency band used is higher.

Although the multi-mode monopulse method has been widely used in large-sized antenna base stations, it is difficult to apply to a small-sized antenna and it is difficult to mount the antenna in a high-speed mobile body. The OTM (On The Move) satellite terminal, which is required to be compact and lightweight, overcomes these drawbacks and applied a multi-mode monopulse tracking system for high-speed antenna stabilization and satellite tracking.

The multi-mode monopulse tracking method obtains angular error information using a TE21 mode signal with the same frequency as the fundamental mode (TE11 mode) signal excited by the feed horn assembly when the antenna beam axis deviates from the satellite direction. Each error information is based on the beacon signal received from the satellite.

The basic board signal and the higher order mode signal received from the satellites are compared in the amplitude and phase comparison device as shown in the following equation.

Figure 112014048698431-pat00001

Here,? X (t) and? Y (t) are In phase and Quadrature phase signals, respectively, and A is amplitude of the comparison signal,

Figure 112014048698431-pat00002
And? Represents the phase of the comparison signal.

FIG. 1 schematically shows the relationship between the satellite signal direction and the equation (1). That is, FIG. 1 shows a geometric relationship between an amplitude value and a phase value calculated by comparing a fundamental mode signal with a higher-order mode signal and a satellite direction. The amplitude calculated in Equation (1) is related to the offset angle between the satellite and the antenna beam axis, and the phase is related to the azimuth with respect to the beam axis. As can be seen from Equation (1), the amplitude and phase of the comparison signal is an important component of the satellite direction tracking, so reducing the individual errors that can be added to the components of the system is a major challenge for this device.

In general, a multi-mode monopulse antenna apparatus separates the beacon signal into a basic mode beacon signal and a higher-order mode beacon signal, and transmits the signal to the LNA. Therefore, it is a basic design structure that the low noise amplifier has two independent inputs and two outputs. Each of the beacon signals thus output is digitized through an ADC (Aanalog-Digital-Converter) through each independent frequency downconverter through a rotary joint, and the amplitudes and phases of the two beacon signals are compared. A diagram showing this is shown in Fig.

Referring to FIG. 2, a basic mode beacon signal and a higher-order mode beacon signal generated in the antenna feed horn assembly are input to a low noise amplifier. The low noise amplifying device is composed of two independent inputs and two outputs, and low noise amplification is performed on the two signals. Each of the beacon signals thus outputted is passed through an independent frequency down converter through a rotary joint connecting the rotating part and the fixed part Is digitized through an ADC (Aanalog-Digital-Converter) to compare the amplitude and phase of the two beacon signals.

In order to miniaturize a general monopulse antenna, a multimode monopulse antenna reduces the number of horizontal and vertical channels and divides the horizontal and vertical displacements from the amplitude and phase of the higher order mode signal based on the fundamental mode signal.

On the other hand, the fundamental mode signal and the high-order mode signal pass through the reception path composed of each independent RF active element. Due to the characteristics of the active element, each reception path is fine, but the amplitude and phase value independently move with time.

If the relative amplitude and phase values of the fundamental mode signal and the higher order mode signal change with time, the tracking system of the monopulse antenna not only can not distinguish between horizontal and vertical values, but also has a displacement error itself.

In order to reduce the amplitude and phase error, a method of commonly using the local oscillation frequency in the down conversion is used, but it is troublesome to correct it after a certain time.

For the above reason, a multi-mode monopulse antenna is required to compensate the amplitude and phase of the independent reception path in real time.

1. Korean Patent Publication No. 10-2010-0107071 2. Korean Patent Publication No. 10-2008-0070286

A small multi-mode monopulse antenna structure for On-The-Move (OTM) for a vehicle compares the amplitude and phase of a fundamental mode beacon signal with a higher-order mode beacon signal to find the direction of a satellite beacon signal.

Therefore, the multi-mode monopulse antenna structure has independent reception paths of at least two channels for the basic mode beacon signal and the high-order mode beacon signal, and each reception path is composed of various RF active elements.

Therefore, the amplitude and phase of the fundamental mode beacon signal and the high-order mode beacon signal passing through the receiving path change with time. This problem is caused by the fact that the monopulse antenna system Which is a critical error of.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problem, and it is an object of the present invention to provide an apparatus and method for amplitude phase correction for a multimode monopulse antenna for eliminating variations in amplitude and phase over time of independent reception paths .

The present invention provides an apparatus for amplitude phase correction for a multimode monopulse antenna for eliminating variations in amplitude and phase over time of independent receive paths in order to achieve the above objects.

The apparatus for amplitude phase correction for multi-mode monopulse antennas comprises:

A low noise amplifier for generating two low noise amplified signals on the two reception paths generated from the multimode monopulse antenna feed horn assembly;

A coupling section for supplying two pilot signals to the respective reception paths of the two low noise amplified signals;

A rotary joint unit for transmitting the two pilot signals and the two amplified signals from the rotation unit to the fixed unit;

A frequency down conversion unit for generating a frequency down conversion signal by using the generated two channel signals; And

Converts the frequency down conversion signal to a digital signal, compares the amplitude value and the phase value of the output signal output from the two reception paths, generates amplitude and phase error values varying with time, and outputs the generated amplitude and phase error values And an amplitude phase comparing unit for correcting the phase difference.

In this case, the two pilot signals may be a basic mode pilot signal and a higher-order mode pilot signal.

The beacon signals on the two receiving paths may be a basic mode beacon signal and a higher order mode beacon signal.

The apparatus may further include a pilot signal generator for generating the two pilot signals.

The amplitude phase comparator may further comprise: two ADCs (Analog-Digital Converters) for converting the frequency downconversion signal into a digital signal; And an amplitude phase comparator for generating amplitude and phase error values varying with time and comparing the amplitude and phase error values of the output signals output from the reception paths of the two ADCs to correct the generated amplitude and phase error values, And the like.

Further, the amplitude error value varying with time may be expressed by the following equation

Figure 112014048698431-pat00003
And

Figure 112014048698431-pat00004

(here

Figure 112014048698431-pat00005
Means an absolute value operation,
Figure 112014048698431-pat00006
Wow
Figure 112014048698431-pat00007
Is an initial gain value measured in each path and represents a value that does not change with time).

Further, the phase error value varying with time may be expressed by the following equation

Figure 112014048698431-pat00008
(here
Figure 112014048698431-pat00009
Denotes a phase operation,
Figure 112014048698431-pat00010
Is an initial measured value and represents a value that does not change with time).

In addition, the amplitude phase comparator performs fast Fourier transform (FFT) on the basic mode beacon signal to compensate for the Doppler phenomenon caused by movement of the terminal, calculates a frequency offset, and then moves the narrowband filter by a frequency offset .

On the other hand, another embodiment of the present invention includes a method of generating a beacon signal on two receive paths generated from a multi-mode monopulse antenna feed horn assembly by a noise amplifying unit, as two low noise amplified signals; The coupling section supplying two pilot signals to each of the reception paths of the two low noise amplified signals; The rotary joint unit transmitting the two pilot signals and the two amplified signals from the rotation unit to the fixed unit; Generating a frequency down conversion signal using the two channel signals to which the frequency down converter is input; And an amplitude / phase comparison unit converts the frequency down conversion signal to a digital signal, compares amplitude values and phase values of output signals output from the two reception paths, generates amplitude and phase error values varying with time, And correcting the phase error value using the pilot signal. The present invention provides a method for correcting an amplitude phase for a multi-mode monopulse antenna using a pilot signal.

According to the present invention, even if a multimode monopulse signal passes through a receiving path having the same structure, there is a variation in amplitude and phase independent of time, depending on the characteristics of the RF active element. It is possible to more flexibly design the receiving path.

Another advantage of the present invention is that the multi-mode monopulse antenna can be used more efficiently by using such phase and amplitude real-time correction techniques, which is an important factor in achieving miniaturization and weight reduction of the satellite terminal.

1 is a conceptual diagram showing a geometric relationship between an amplitude value and a phase value calculated by comparing a general fundamental mode signal with a higher-order mode signal and a satellite direction.
2 is a block diagram of a general multi-mode monopulse antenna system.
3 is a block diagram of a multi-mode monopulse antenna system 300 according to an embodiment of the present invention.
4 is a detailed configuration diagram of the amplitude phase comparison unit 370 shown in FIG.
5 is a flowchart illustrating a process of correcting an amplitude and a phase for a multi-mode monopulse antenna using a pilot 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 present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

3 is a block diagram of a multi-mode monopulse antenna system 300 according to an embodiment of the present invention. 3, the multi-mode monopulse antenna system 300 includes a multi-mode monopulse antenna feed horn assembly 310, a basic mode beacon signal output from the multi-mode monopulse antenna feed horn assembly 310, A low noise amplifier 320 for low noise amplifying the mode beacon signal, a pilot signal generator 340 for generating a pilot signal input to the signal output from the low noise amplifier 320, A rotary joint unit 350 for receiving a signal output from the low noise amplifier 320, and a control unit 350 for controlling the two channels output from the rotary joint unit 350, A downconverter 360 for downconverting a signal, an amplitude phase ratio (A / D) converter 360 for converting the downconverted signal into a digital signal and comparing the amplitudes and phases of the signals output from the two reception paths, It is configured to include a unit 370 and the like.

The low-noise amplifier 320 includes a first low-noise amplifier 321 for amplifying a basic mode beacon signal generated by the antenna feed horn assembly 310 and a second low-noise amplifier 322 for amplifying a higher-order mode beacon signal.

In particular, the pilot signal generator 340 separately generates two pilot signals in addition to the basic mode beacon signal and the high-order mode beacon signal generated in the antenna feed horn assembly 310.

The coupling unit 330 finally couples the two generated pilot signals to the receive path of the basic mode beacon signal and the higher-order mode beacon signal, and finally inputs the two pilot signals to the amplitude phase comparator 370. To this end, the coupling portion 330 includes a first coupler 331 and a second coupler 332. That is, the first coupler 331 supplies the pilot signal to the reception path of the basic mode beacon signal, and the second coupler 332 supplies the pilot signal to the reception path of the higher-order mode beacon signal.

The rotary joint unit 350 separates the rotary unit and the fixed unit and transmits the two channel signals (basic mode signal and high-order mode signal) coupled with the pilot signal from the rotation unit to the fixed unit. A satellite antenna mounted on a moving platform is required to rotate 360 degrees in azimuth direction for satellite tracking. Therefore, in order to transmit the RF transmission / reception signal to the moving antenna, a rotation unit (antenna pedestal, etc.) rotating 360 degrees and a device for connecting the fixed unit (transceiver, etc.) fixed to the platform are required.

The basic mode beacon signal and the higher-order mode beacon signal generated at the output terminal of the low-noise amplifier 320 can be expressed by Equation 2 and Equation 3, respectively.

Figure 112014048698431-pat00011

Figure 112014048698431-pat00012

here

Figure 112014048698431-pat00013
,
Figure 112014048698431-pat00014
Represents the amplitudes of the basic mode beacon signal and the higher order mode beacon signal,
Figure 112014048698431-pat00015
,
Figure 112014048698431-pat00016
Represent the phases of the basic mode beacon signal and the higher order mode beacon signal, respectively.

The beacon signals are subjected to down-conversion and digitization of independent paths and input to the phase amplitude comparison unit 370. Of course, a frequency down conversion unit 360 for frequency down conversion is configured in the middle. The frequency down converter 360 includes a first frequency down converter 361 and a second frequency down converter 362. The first frequency down converter 361 downconverts the basic mode beacon signal and the basic mode pilot signal And the second frequency downconverter 362 frequency downconverts the higher order mode beacon signal and the higher order mode pilot signal.

In addition, the phase amplitude comparing unit 370 can obtain a phase value and / or an amplitude value related to the direction of the antenna from the comparison signal of the basic mode beacon signal and the high-order mode beacon signal. To this end, the phase amplitude comparator 370 includes a first ADC 371 and a second ADC 372 for converting the frequency downconverted signal to a digital signal, a phase value and / or amplitude value And a phase amplitude comparator 373 for comparing the phase of the output signal from the phase comparator 373. Accordingly, the signals at the input terminals of the phase amplitude comparator 373 can be expressed by the following equations.

Figure 112014048698431-pat00017

Figure 112014048698431-pat00018

here

Figure 112014048698431-pat00019
,
Figure 112014048698431-pat00020
Expresses each initial gain value of the independent path,
Figure 112014048698431-pat00021
,
Figure 112014048698431-pat00022
Represents that the gain of the independent path varies independently with time. Similarly, in terms of phase
Figure 112014048698431-pat00023
,
Figure 112014048698431-pat00024
Denotes an initial phase value of an independent path,
Figure 112014048698431-pat00025
,
Figure 112014048698431-pat00026
Represents a change in phase with time.

In general, all RF (Radio Frequency) components (especially frequency mixers) cause a change in gain and phase, although they are insignificant to the channel characteristics of the system path due to changes in ambient conditions (especially temperature changes) and degradation of characteristics due to long- .

Since the multi-mode monopulse antenna compares the basic mode beacon signal with the higher-order mode beacon signal and finds the direction of the antenna from the amplitude and phase obtained therefrom, the amplitude and phase errors cause a serious error in the entire system.

To prevent such errors, there is a method of periodically correcting the phase and amplitude values of the system, but this is not time and cost effective. In addition, there is a disadvantage in that, if there is a slight change in the system (cable replacement, etc.), correction must be performed again. That is, Equation (1) can be expressed as Equation (4) and Equation (5) as follows.

Figure 112014048698431-pat00027

The term " amplitude error " refers to a time error in the output comparison value between the basic mode beacon signal and the higher order mode beacon signal of Equation (6)

Figure 112014048698431-pat00028
,
Figure 112014048698431-pat00029
In phase,
Figure 112014048698431-pat00030
It is necessary to remove this value.

In order to solve this inefficiency, in one embodiment of the present invention, the pilot signal is inputted to the output terminal of the low noise amplifier 320 to remove the amplitude error value and the phase error value in real time. The basic mode pilot signal and the higher-order mode pilot signal at the input terminal of the low-noise amplifier 320 can be expressed by Equations (7) and (8).

Figure 112014048698431-pat00031

Figure 112014048698431-pat00032

here

Figure 112014048698431-pat00033
,
Figure 112014048698431-pat00034
Represents the amplitude values of the basic mode pilot signal and the higher-order mode pilot signal,
Figure 112014048698431-pat00035
,
Figure 112014048698431-pat00036
Represent the initial phase values of the basic mode pilot signal and the higher-order mode pilot signal, respectively.

Equation (7) and Equation (8) are input to the phase amplitude comparator 373 through down-conversion and digitization of independent paths, and the input signal can be expressed by Equations (9) and (10).

Figure 112014048698431-pat00037

Figure 112014048698431-pat00038

The error value according to the time of the amplitude can be calculated by comparing amplitudes of Equations (7), (9), (8) and (10). These are the same as the following.

Figure 112014048698431-pat00039

Figure 112014048698431-pat00040

here

Figure 112014048698431-pat00041
Means an absolute value operation,
Figure 112014048698431-pat00042
Wow
Figure 112014048698431-pat00043
Is an initial gain value measured in each path and represents a value that does not change with time.

On the other hand, a phase change can be calculated by comparing phases of Equation (9) and Equation (10) with respect to a time-dependent error value of the phase. This is shown in the following equation.

Figure 112014048698431-pat00044

here

Figure 112014048698431-pat00045
Denotes a phase operation,
Figure 112014048698431-pat00046
Is an initial measured value that does not change with time.

By correcting the value of Equation (6) using Equations (11) to (13), it is possible to calculate an amplitude value and a phase value that do not vary with time.

4 is a detailed configuration diagram of the amplitude phase comparison unit 370 shown in FIG. Referring to FIG. 4, the basic mode pilot signal is input to the amplitude phase comparator 370 together with the basic mode beacon signal. Similarly, the higher-order mode pilot signal is input to the amplitude-phase comparison unit 370 together with the higher-order mode beacon signal.

The four signals input through the two paths are respectively down-converted by a DDC (Digital-to-Digital Converter) 410 and appropriately filtered by an FPGA (Field-Programmable Gate Array) Lt; / RTI >

The transmitted signal is narrow-band filtered (BPF BW: approximately 500 Hz) at 500 Hz again by a narrowband filter (BPF) 430 After sufficient removal of the noise, each phase comparison value and amplitude comparison value for the base mode / higher order mode beacon signal and the base mode / higher order mode pilot signal is calculated.

The satellite signal magnitude phase difference extraction unit 433 extracts the satellite signal magnitude phase difference, the pilot signal magnitude phase difference extraction unit 434 extracts the pilot signal magnitude phase difference difference, and the error value calculated in the pilot signal, The error value is corrected. In the compensation and error calculator 435, pilot signal compensation and EL (elevation angle) / AZ (azimuth) errors are calculated.

On the other hand, in a mobile terminal, a frequency offset of a beacon signal occurs in proportion to a moving speed due to a Doppler phenomenon. Due to this frequency offset, the center frequency of the narrowband filter must be shifted by the frequency offset so that the beacon signal does not deviate from the pass band during narrowband filtering.

Therefore, the fast Fourier transform (FFT) operation unit 432 performs frequency offset calculation through the FFT of the basic mode signal, and the narrowband filter 431 (BPF BW: about 500 Hz) moves by the calculated frequency offset, Perform filtering.

5 is a flowchart illustrating a process of correcting an amplitude and a phase for a multi-mode monopulse antenna using a pilot signal according to an embodiment of the present invention. Referring to FIG. 5, the noise amplification unit 320 of FIG. 3 generates two low noise amplified signals on the two reception paths generated from the multi-mode monopulse antenna feed horn assembly 310 (FIG. 3) S510, S520).

When the amplified signal is generated, the coupling unit 330 supplies the two pilot signals to the respective receiving paths of the two low-noise amplified signals (step S530).

Then, the rotary joint unit (350 in FIG. 3) transmits the two pilot signals and the two amplified signals from the rotation unit to the fixed unit (step S540).

When two channel signals are generated, the frequency down converter 360 in FIG. 3 generates a frequency down conversion signal using the generated two channel signals (step S550).

Thereafter, the amplitude phase comparison unit (370 in Fig. 3) converts the frequency down conversion signal to a digital signal (step S560).

Then, the amplitude and phase error values varying with time are generated by comparing the amplitude values and phase values of the output signals output from the reception paths of the two frequency down-converted signals, and the generated amplitude and phase error values are corrected Step S580).

300: Multi-mode monopulse antenna system
310: Antenna feeding horn assembly
320: Low noise amplifier
321,322: Low-noise amplifier
330: Coupling portion
331,332: Coupler
340: Pilot signal generator
350: Lotion joint part
360: frequency down-
361,362: frequency down converter
370: amplitude phase comparison section
371,372: ADC (Analog-Digital Converter)
373: Amplitude Phase Comparator
410: Digital-Digital Converter (DDC)
420: Field-Programmable Gate Array (FPGA)
430: (Digital Signal Processor)
431: Narrow band filter
432: Fast Fourier Transform (FFT)

Claims (8)

A low noise amplifier for generating two low noise amplified signals on the two reception paths generated from the multimode monopulse antenna feed horn assembly;
A coupling section for supplying two pilot signals to the respective reception paths of the two low noise amplified signals;
A rotary joint unit for transmitting the two pilot signals and the two amplified signals from the rotation unit to the fixed unit;
A frequency down conversion unit for generating a frequency down conversion signal using two channel signals transmitted to the fixed unit; And
Converts the frequency down conversion signal to a digital signal, compares the amplitude value and the phase value of the output signal output from the two reception paths, generates amplitude and phase error values varying with time, and outputs the generated amplitude and phase error values And an amplitude phase comparing unit for correcting the amplitude phase,
Wherein the two pilot signals are a basic mode pilot signal and a higher order mode pilot signal and the beacon signals on the two receive paths are a basic mode beacon signal and a higher order mode beacon signal,
The amplitude error value that varies with the time is expressed by Equation
Figure 112015046684761-pat00060
And

Figure 112015046684761-pat00061

(here
Figure 112015046684761-pat00062
Means an absolute value operation,
Figure 112015046684761-pat00063
Wow
Figure 112015046684761-pat00064
Is an initial gain value measured in each path and represents a value that does not vary with time). The apparatus for amplitude phase correction for a multi-mode monopulse antenna using a pilot signal.
delete The method of claim 1, wherein
And a pilot signal generator for generating the two pilot signals based on the pilot signals.
The method of claim 1, wherein
Wherein the amplitude phase comparison unit comprises:
Two ADCs (Analog-Digital Converters) for converting the frequency down-converted signals into digital signals; And
And an amplitude phase comparator for generating amplitude and phase error values varying with time and for correcting the generated amplitude and phase error values by comparing amplitude values and phase values of output signals output from the reception paths of the two ADCs Wherein the pilot signal is used as a reference signal.
delete The method according to claim 1,
The phase error value varying with time may be expressed by the following equation
Figure 112015046684761-pat00052
(here
Figure 112015046684761-pat00053
Denotes a phase operation,
Figure 112015046684761-pat00054
Is an initial measured value and is a value that does not vary with time).
The method of claim 6, wherein
Wherein the amplitude phase comparator performs Fast Fourier Transform (FFT) on a basic mode beacon signal to compensate for a Doppler phenomenon caused by movement of a terminal, calculates a frequency offset, and then moves the narrowband filter by a frequency offset An apparatus for amplitude phase correction for a multi - mode monopulse antenna using a pilot signal.

delete
KR1020140062189A 2014-05-23 2014-05-23 Apparatus for correcting amplitude and phase for multi-mode mono pulse antenna using pilot signals KR101554287B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140062189A KR101554287B1 (en) 2014-05-23 2014-05-23 Apparatus for correcting amplitude and phase for multi-mode mono pulse antenna using pilot signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140062189A KR101554287B1 (en) 2014-05-23 2014-05-23 Apparatus for correcting amplitude and phase for multi-mode mono pulse antenna using pilot signals

Publications (1)

Publication Number Publication Date
KR101554287B1 true KR101554287B1 (en) 2015-09-18

Family

ID=54248675

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020140062189A KR101554287B1 (en) 2014-05-23 2014-05-23 Apparatus for correcting amplitude and phase for multi-mode mono pulse antenna using pilot signals

Country Status (1)

Country Link
KR (1) KR101554287B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106856407A (en) * 2017-01-10 2017-06-16 四川九洲电器集团有限责任公司 A kind of car-mounted device and method for amplifying RF signal
KR101927129B1 (en) 2017-01-24 2018-12-11 국방과학연구소 Apparatus and method for receiving beacon signal
KR102427728B1 (en) * 2021-05-21 2022-08-01 국방과학연구소 Operating method for electronic apparatus for processing interference suprressed signal using higer order signal and electronic apparatus supporting thereof
CN118381570A (en) * 2024-06-24 2024-07-23 西安欣创电子技术有限公司 Automatic rapid calibration system for ultra-wideband multichannel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101313052B1 (en) * 2012-05-03 2013-09-30 국방과학연구소 Multi mode monopulse tracking system and multi mode monopulse tracking method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101313052B1 (en) * 2012-05-03 2013-09-30 국방과학연구소 Multi mode monopulse tracking system and multi mode monopulse tracking method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106856407A (en) * 2017-01-10 2017-06-16 四川九洲电器集团有限责任公司 A kind of car-mounted device and method for amplifying RF signal
KR101927129B1 (en) 2017-01-24 2018-12-11 국방과학연구소 Apparatus and method for receiving beacon signal
KR102427728B1 (en) * 2021-05-21 2022-08-01 국방과학연구소 Operating method for electronic apparatus for processing interference suprressed signal using higer order signal and electronic apparatus supporting thereof
CN118381570A (en) * 2024-06-24 2024-07-23 西安欣创电子技术有限公司 Automatic rapid calibration system for ultra-wideband multichannel

Similar Documents

Publication Publication Date Title
US10374730B2 (en) Calibration techniques for an antenna array
US9667335B2 (en) Wireless communication with interference mitigation
KR101554287B1 (en) Apparatus for correcting amplitude and phase for multi-mode mono pulse antenna using pilot signals
CN109120561B (en) Medium frequency offset correction method for low-orbit satellite mobile communication system
CN101957444B (en) Multichannel radar amplitude and phase automatic correcting method and device
US20200292713A1 (en) Systems and methods for frequency drift compensation for radio receivers
US9154217B1 (en) Direct conversion remote satellite communications terminal
US7999738B2 (en) Systems and methods for tracking a remote source and orientation control
WO2016031108A1 (en) Fmcw radar
EP2099141A2 (en) Reduced cost mobile satellite antenna system using a plurality of satellite transponders
US10509106B2 (en) Method for calibrating a radar system
US10330775B2 (en) Transmitter, transmission method, phase adjustment device, and phase adjustment method
CN110855346A (en) Satellite signal receiving device and Doppler frequency offset processing method
CN111736124A (en) Radar signal channel error processing method
US20240204811A1 (en) Wireless communication with interference mitigation
JP5694240B2 (en) Tracking antenna device and transmission phase compensation method
KR101556067B1 (en) Apparatus and method for phase error detection in active array antenna
EP3559700B1 (en) Systems and methods for frequency drift compensation for radio receivers
JP4982406B2 (en) Multi static radar device
US20200028475A1 (en) METHOD AND APPARATUS FOR CALIBRATION AND EQUALIZATION OF MULTIPORT AMPLIFIERS (MPAs)
KR102478751B1 (en) Estimation device of radar direction of arrival based on time division analog to digital converter, and method thereof
JP2007225319A (en) Pulse radar system
KR102518670B1 (en) Digital monopulse antenna reception module, antenna apparatus for monopulse satellite tracking with the same, and method of tracking satellite
Vilnrotter et al. Demonstration and evaluation of the ka-band array feed compensation system on the 70-meter antenna at DSS 14
US20230076883A1 (en) Apparatus and method for controlling radar in vehicle

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20180904

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20190903

Year of fee payment: 5