KR101030236B1 - Wavefront device for testing gps adapted antenna - Google Patents

Abstract

The present invention relates to a GPS adaptive array antenna, and more particularly, to an L-band wavefront simulation apparatus for performance testing of a GPS adaptive array antenna.

The present invention consists of a five-channel phase control device configured to arbitrarily generate a phase plane of a GPS jamming signal incident on a five-element array antenna, and a control computer that independently executes phase control commands for each channel. Nulling performance tests on the antenna can be simulated and the incident angle of the jamming signal can be simulated in the laboratory, not in outdoor environments such as GPS signals and jamming in an anechoic chamber.

GPS, adaptive array antenna, antenna, phase simulator, jamming signal invalidation, performance test

Description

Phase plane simulator for WPS adaptive array antenna test {WAVEFRONT DEVICE FOR TESTING GPS ADAPTED ANTENNA}

The present invention relates to a GPS adaptive array antenna, and more particularly, to a wavefront simulation apparatus for performance testing of a GPS adaptive array antenna.

 Satellite navigation technology such as GPS is closely related to real life, which is actively used for civil and military purposes including vehicle navigation. This satellite navigation technology has a wide range of applications. In addition, a signal system of satellite navigation technology such as GPS has been disclosed, and has a disadvantage of being very vulnerable to external electromagnetic interference signals and jamming signals due to reception power below the receiver noise level. Therefore, in order to overcome these drawbacks, many countries, including developed countries, continue to develop related technologies. Among them, a technique related to an adaptive array antenna for GPS is one of attempts to solve the above drawbacks.

Array antenna technology is a nulling and direction detection technique of a jamming signal by receiving a phase difference characteristic of a signal reaching each element and using the phase difference characteristic of the received signal. However, there is a technical limitation that the test is not easy because an expensive anechoic chamber or an outdoor test facility must be used for the performance test of the array antenna technology. Therefore, in the current technical situation, a performance evaluation method for analyzing the various jamming conditions in the array antenna technology at the laboratory level, rather than the expensive anechoic chamber or the outdoor test facility, is being studied.

As described above, in order to perform a jamming signal nulling performance test on an adaptive array antenna for GPS, there is a technical limitation to configure and perform outdoor environmental conditions such as GPS signals and jamming in an anechoic chamber. In order to solve the technical limitations of the prior art, it is an object of the present invention to provide an apparatus and method capable of performing a performance test of a GPS adaptive array antenna in a laboratory. In particular, the present invention provides an L-band wavefront simulation apparatus for performing a performance test of a GPS adaptive array antenna in a laboratory.

 In particular, the present invention is a wavefront simulation apparatus for the performance test of the GPS adaptive array antenna, the angle of incidence of the jamming signal incident on the 5-element array antenna through the phase controller of each channel (Wavefront) The present invention provides an apparatus and method for providing a test such as direction detection and nulling of a jamming signal by inputting a 5-channel electronic part for an adaptive array antenna.

In order to achieve the above object, the test phase plane simulator for GPS adaptive array antenna according to the present invention,

 In performance test such as nulling reception power of jamming direction for GPS (Grobal Positioning System) adaptive array antenna,

A GPS jamming signal generator for generating a GPS jamming signal; A phase plane control device for outputting phase delay information for each channel in order to simulate an arbitrary wavefront of the arrival direction of the GPS jamming signal; By using the GPS jamming signal received from the GPS jamming signal generator and the phase delay information for each channel received from the phase plane control device,

And a GPS jamming signal phase plane controller for generating a phase plane simulation output signal for each channel corresponding to a specific direction with respect to the GPS jamming signal.

Preferably, the GPS jamming signal phase plane controller includes five phase controllers corresponding to five channels for the GPS jamming signal.

Preferably, the GPS jamming signal phase plane controller is for a GPS L band (1 to 2 GHz) reaching each element of a 5-element array antenna, and each channel is used to simulate the phase delay between channels incident on each antenna element. Independent control is possible.

Preferably, the phase delay information is information related to the formation of the phase plane, and the estimated arrival angle information of the GPS jamming signal is calculated as a phase delay.

Preferably, the phase control device receives a command input from a computer that calculates a phase shift signal of each internal channel, calculates the estimated arrival angle information of the GPS jamming signal assigned to each channel as a phase delay, and outputs a DAC. The analog voltage control signal may be generated and output to the phase controller for each channel in the phase controller.

Preferably, the GPS jamming signal phase plane controller is characterized in that it comprises a satellite signal distributor by receiving a GPS signal of a predetermined power level from the GPS / GLONASS satellite signal simulator.

Preferably, the GPS jamming signal phase plane controller is characterized in that it comprises a satellite signal distributor by receiving a GPS signal of a predetermined power level from the GPS / GLONASS satellite signal simulator.

The apparatus may further include a GPS / GLONASS adaptive array antenna N-channel electronic unit configured to receive the phase plane simulation output signal and the GPS signal of the constant power level from the GPS jamming signal phase plane controller.

In addition, in order to achieve the above object, the test phase plane simulation apparatus of the GPS adaptive array antenna according to the present invention,

A 5-channel GPS jamming signal phase plane controller configured to randomly generate a phase plane of the GPS jamming signal incident on the 5-element array antenna; A phase plane controller for independently executing a phase control command for each of the five channels; The GPS jamming signal phase plane is obtained by converting the phase and amplitude characteristics of the GPS jamming signal incident on each element of the GPS jamming signal phase plane controller from the GPS jamming signal generator into wavefront information. And 5 channel electronic parts of the adaptive array antenna received from the controller.

Preferably, each element is characterized in that the phase controller of the GPS adaptive array antenna corresponding to each channel of the five channels.

The present invention is a phase plane simulator for verifying a null formation characteristic test on a space of a GPS adaptive array antenna. The angle of incidence of a jamming signal incident on a 5-element array antenna is determined by a computer such as a phase plane controller. By generating a simulated jamming signal, it can be used for performance testing and analysis of direction detection and nulling technology, which can be used to develop test evaluation equipment for a GPS jamming response device.

The present invention applies to GPS communications and systems. However, the technical idea of the present invention may be applied to a wireless communication and communication system without being limited thereto.

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

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

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

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

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

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 description will be omitted.

Hereinafter, the concept of the present invention will be briefly described with reference to FIGS. 1 to 4.

The present invention focuses on the limitations of the prior art that a jamming signal nulling performance test should be performed on an adaptive array antenna for GPS in an anechoic room and outdoor environment conditions. With this in mind, the present invention can perform the performance test of the GPS adaptive array antenna in the laboratory.

The concept of the present invention is to simulate an arbitrary wavefront of the arrival direction of a GPS jamming signal in a performance test such as nulling reception power in the jamming direction with respect to the GPS adaptive array antenna. In order to simulate the phase plane control device for the GPS L band (1 to 2 GHz) reaching each element of the 5-element array antenna and the phase delay between channels incident on each antenna element, each channel is independently controlled. In addition, in order to implement the concept of the present invention, the present invention inputs a signal output from the phase control device 140 (ie, in FIG. 2) for controlling the phase delay characteristics after receiving the GPS jamming signal Receiving input terminal) and the GPS satellite signal without phase delay (that is, the signal received through the satellite signal divider 126 in Figure 2) can be implemented as a structure, the first RF input terminal for GPS jamming signal input, The second input is for GPS satellite signal simulator signal input. The GPS jamming signal phase controller outputs the GPS signal of constant power level to the output channel individually. Pass in wealth.

The present invention provides a GPS jamming signal phase plane controller 120, a control computer (phase plane control device) 140, and an adaptive array antenna of a multi-channel (limiting five channels as an example for convenience of description) as main components. 5 channels (limited to 5 channels as an example for convenience of description) includes an electronic unit (Antenna Electronics) 150. More specifically, the present invention provides a phase plane controller 120 of five channels for generating a phase plane in a specific direction for a GPS jamming signal, and a phase plane control device that enables independent phase and amplitude control for each channel. Through the configuration of the control computer 140, the incident angle of the jamming signal can be simulated in the laboratory. In addition, since the phase plane controller 120 of the present invention can operate within a frequency range of 1 to 2 GHz, it can be used in the development of an adaptive array antenna for L2 and GLONASS in Russia, including the GPS L1 signal. In addition, the present invention converts the phase and amplitude characteristics of the jamming signal incident to each element of the GPS adaptive array antenna into wavefront information, and then inputs the 5-channel antenna of the adaptive array antenna 150 to the antenna of the adaptive array antenna. It has a structure that is directly applied.

The phase plane controller 120 can change the phase shift of each channel from 0 to 360 degrees by using I (Inphase) and Q (Quadrature) signals as control inputs, and the DAC (Digital to It is performed by transmitting 0 ~ 1000mV voltage signal for phase control using Analog Converter. And it is composed of independent phase controller (121 ~ 125) to facilitate the expansion of the number of channels in preparation for the feature that can generate the phase plane by inputting the independent phase information to each channel and the array antenna shape of the various configurations in the future. Through the configuration of the present invention, performance testing such as jamming nulling on the GPS adaptive array antenna is possible in a laboratory without an anechoic room or an outdoor environment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings of FIGS. 1 to 6.

1 is a conceptual diagram of a wavefront simulator for testing a GPS adaptive array antenna according to an embodiment of the present invention. 2 is a diagram illustrating in detail a GPS jamming signal phase plane controller 120 (hereinafter referred to as a 'phase plane controller'). In particular, Figure 2 is an embodiment of the present invention, the output of the five phase controllers 121 to 125 and the GPS / GLONASS satellite simulator 130 built in the phase plane controller 120 to the adaptive array antenna electronics ( 150) It shows a structure that decomposes evenly.

As illustrated in FIGS. 1 and 2, the GPS jamming signal generator 110 generates a jamming signal in a GPS band and sends the jamming signal to the GPS jamming signal phase plane controller 120. The jamming signal input to the phase controller 120 is input to the phase controllers 121 to 125 of each channel of the phase controller 120 shown in detail in FIG. 2.

On the other hand, the phase control device 140 calculates the estimated arrival angle information of the GPS jamming signal as the phase delay, and generates an analog voltage control signal which is a DAC output. In more detail, the phase control device 140 receives a command input from a computer that calculates a phase shift signal of each internal channel (for example, five channels), and assigns a phase controller 121 to each channel. In step 125, the estimated angle of arrival of the GPS jamming signal is calculated as a phase delay, and an analog voltage control signal, which is a DAC output, is input to a separate channel. As such, the analog voltage control signal generated by the phase plane controller 140 (ie, related to the phase delay of the jamming signal) is input to the phase controllers 121 to 125 of each channel in the phase plane controller 120. In particular, the phase plane control device 140 adjusts the phase delay characteristics of the five channels in the GPS phase plane controller 120 and can individually control the precise phase shift at any phase angle from 0 degree to 360 degree.

The phase controllers 121 to 125 of each channel in the phase plane controller 120 receive the GPS jamming signal output from the first GPS jamming signal generator 110 into each channel, and then phase delay associated with the formation of the second phase plane. Information (ie, the analog voltage control signal) from the phase control device 140, and a 'phase simulation output signal' for phase difference information between channels for the third GPS jamming signal (21, 22, 23). , 24 and 25 are applied to the GPS / GLONASS adaptive array antenna N-channel electronic unit 150.

 Meanwhile, the GPS / GLONASS satellite simulator 130 outputs a GPS signal according to a predetermined scenario as an RF (Radio Frequency) signal, and transmits the GPS signal to the GPS L1 / L2 adaptive array antenna electronic unit 150 through the satellite signal power divider 126. It delivers a constant power GPS signal with no phase delay. Thereafter, the GPS jamming signal and the satellite signal simulated with the phase plane in a specific direction are simultaneously input to the satellite navigation receiver 11. Here, the process of generating the GPS jamming signal simulated by the phase plane of the specific direction and the satellite signal will be described as follows. First, a GPS re-blind signal simulated with a phase plane in a specific direction is: 1) The GPS jamming signal generated from the GPS jamming signal generator 110 is transferred to each channel phase controller 121 to 125 in the phase plane controller 120. Input; 2) the phase plane controllers 121 to 125 of each channel use information such as the phase delay associated with the phase plane formation from the phase plane controller 140; 3) Phase plane simulation output signals 21, 22, 23, 24 and 25 are generated. In addition, the satellite signal is a GPS signal of a constant power without phase delay, and a predetermined GPS signal (RF signal) output from the GPS / GLONASS satellite simulator 130 is connected to the GPS L1 / through the satellite signal power divider 126. The signal is input to the L2 adaptive array antenna electronic unit 150.

3 is a diagram illustrating a shape of a phase plane of a jamming signal 11 and a phase difference applied to the adaptive array antenna 310 according to an embodiment of the present invention. 3 shows a geometric relationship between a GPS satellite 340 disposed over 20,000 kilometers over the earth and a jamming signal transmitted near the earth's surface. Using this principle, the phase plane can be simulated for the jamming signal in a specific direction.

4 is an embodiment of the present invention, by transmitting the information on the phase plane of the jamming signal 11, which can be simulated using the present invention to each channel to generate a delay signal by inputting a signal for the phase shift Computer card for phase controller. The above description of FIGS. 1 and 2 applies to the configuration and operation of FIG. 4.

FIG. 5 illustrates an output phase control characteristic curve of an input signal of a five-channel phase shifter applied to FIG. 4.

3 to 5, the operation and effects of the phase planar simulator for the GPS adaptive array antenna configured in this embodiment of FIGS. 1 and 2 will be described in detail.

In order to configure the performance test equipment such as the nulling technique and the direction finding of the GPS adaptive array antenna 300, the arrival angle information of the jamming signal as shown in FIG. 3 is required, which is an array antenna. This can be obtained by analyzing the phase difference characteristic of the jamming signal applied to each element of. And it is necessary to receive at least four GPS satellite signals that can be observed from the ground. Through such a condition, the angle of arrival of the jamming signal is obtained based on the array antenna 1 (310) element to obtain a relative phase difference with respect to the remaining elements of the RF signal incident. The delay characteristics of the signal incident on the remaining elements calculated thereafter are converted into phase differences between channels and input to the phase control device 140 to simulate a three-dimensional phase plane for a GPS jamming signal reached in a desired direction. Through this, performance test of GPS adaptive array antenna can be performed without indoor and outdoor test facilities.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a conceptual diagram of a phase planar simulator for testing a GPS adaptive array antenna according to an embodiment of the present invention.

FIG. 2 is a block diagram of a phase plane simulator showing FIG. 1 in detail as an embodiment of the present invention.

3 is a diagram illustrating schematic and phase delay characteristics of an outdoor jamming environment according to one embodiment of the present invention.

4 is a diagram illustrating a phase control processing module and a computer between input channels according to one embodiment of the present invention.

5 is a diagram illustrating a controller phase shift characteristic using a phase control computer according to an embodiment of the present invention.

Claims (10)

 In the performance test such as nulling reception power in the jamming direction for a GPS (Global Positioning System) adaptive array antenna, A GPS jamming signal generator for generating a GPS jamming signal; A phase plane control device for outputting phase delay information for each channel in order to simulate an arbitrary wavefront of the arrival direction of the GPS jamming signal; By using the GPS jamming signal received from the GPS jamming signal generator and the phase delay information for each channel received from the phase plane control device. And a GPS jamming signal phase plane controller configured to generate a phase plane simulation output signal for each channel corresponding to a specific direction with respect to the GPS jamming signal. The method of claim 1, wherein the GPS jamming signal phase plane controller A phase plane simulator for testing an adaptive array antenna comprising five phase controllers corresponding to five channels of a GPS jamming signal. The method of claim 1, wherein the GPS jamming signal phase plane controller GPS adaptive array for GPS L band (1 ~ 2GHz) reaching each element of 5-element array antenna, and independent control between each channel is possible to simulate phase delay between channels incident on each antenna element Phase plane simulator for testing antennas. The method of claim 1, wherein the phase delay information is And a phase delay simulation device for the GPS adaptive array antenna, wherein the estimated arrival angle information of the GPS jamming signal is calculated as a phase delay. The method of claim 1, wherein the phase control device Receives a command inputted from a computer that calculates phase shift signals for each internal channel, calculates estimated arrival angle information of the GPS jamming signal assigned to each channel as phase delay, and generates an analog voltage control signal that is a DAC output. Phase plane simulation apparatus for a GPS adaptive array antenna characterized in that the output to the phase controller for each channel in the controller. The method of claim 1, wherein the GPS jamming signal phase plane controller A phase plane simulator for testing a GPS adaptive array antenna, characterized by converting phase and amplitude characteristics of the GPS jamming signal incident to each phase controller of the GPS adaptive array antenna into wavefront information. The method of claim 1, wherein the GPS jamming signal phase plane controller GPS / GLONASS Test phase plane simulator for GPS adaptive array antenna, comprising: a satellite signal divider for receiving and transmitting GPS signals from a satellite signal simulator. The method according to claim 1 or 7, And a GPS / GLONASS adaptive array antenna N-channel electronic unit configured to receive the phase plane simulation output signal and the GPS signal from the GPS jamming signal phase plane controller. A 5-channel GPS jamming signal phase plane controller configured to randomly generate a phase plane of the GPS jamming signal incident on the 5-element array antenna;  A phase plane controller for independently executing a phase control command for each of the five channels; The GPS jamming signal phase plane is obtained by converting the phase and amplitude characteristics of the GPS jamming signal incident on each element of the GPS jamming signal phase plane controller from the GPS jamming signal generator into wavefront information. A phase plane simulator for testing an GPS adaptive array antenna comprising five channel electronics of an adaptive array antenna received from a controller. 10. The device of claim 9, wherein each device is And a phase controller of a GPS adaptive array antenna corresponding to each of the five channels.

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