KR20020048496A - Mobile Active Antenna System and its Tracking Method for Multi-satellite signal reception - Google Patents

Abstract

PURPOSE: An active antenna apparatus for the mobile reception of a multi satellite signal and the chasing method are provided to receive the satellite signal of an another different polarization and receive the desired satellite signal in moving under the existence of the multi satellite signal having same polarization and frequency. CONSTITUTION: A radome(1) protects the system from the outside. A radiation module(2) can receive an electric wave of double polarized wave and a multiple satellite signal. The multiple satellite signal is inputted to the radiation module(2) passing through the radome(1). An active channel module(3) amplifies the received satellite signal as a low noise. A beam formation module(4) controls the phase of a phase displacement device. A multiple satellite chasing controller(9) controls the chasing of the desired polarized satellite signal among the multiple satellite signal when moving.

Description

Active antenna system and tracking method for multi-satellite signal mobile reception {Multi-satellite signal reception}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active antenna device for tracking multi-satellite signals and to a tracking method. More particularly, the present invention relates to a tracking antenna that can be mounted on a moving object to receive satellite signals.

Since a tracking antenna for receiving a satellite signal during a conventional movement mainly receives one desired satellite signal or only a predetermined polarized signal, a conventional satellite tracking antenna cannot receive satellite signals of different polarizations of the same satellite. There was a problem that could not be.

1 is a state diagram illustrating an environment in which a multi-satellite signal exists in an arbitrary region X. FIG. As shown in FIG. 1, satellites A and B located at different longitudes simultaneously transmit right hand circular polarization (RHCP) and left hand circular polarization (LHCP) signals to the same frequency channel of the same bandwidth. Send it out. In addition, each channel bandwidth capable of receiving signals of satellite A and satellite B is the same BW. In this case, if a satellite signal of the same polarization on the same frequency channel from two satellites in any X region (e.g. in the United States) is received by the conventional satellite signal mobile receiving tracking antenna, There is a problem that a desired satellite channel cannot be selected and received while moving using a tracking antenna.

2 is a state diagram illustrating an environment in which a multi-satellite signal is present in any Y region. Referring to FIG. 2, FIG. 2 illustrates a case in which a satellite signal of the same polarization is received from an existing satellite signal mobile receiving tracking antenna from the two satellites in the same Y channel as in FIG. However, the two satellites are different in channel frequency and channel bandwidth from the satellites in FIG. In this case, if a tracking antenna that can be received in the region X of FIG. 1 is used in the region Y of FIG. 2, a signal correction, a tracking frequency, and a bandwidth of the tracking channel are changed.

Therefore, the present invention devised to solve this problem can receive satellite signals of different polarizations of the same satellite, and can receive a desired satellite signal during movement in an environment where multiple satellite signals of the same polarization and the same frequency exist. It is also an object of the present invention to provide an apparatus and a method for coping with changes in a satellite's received signal level, tracking frequency, and tracking channel bandwidth according to a change in the reception area.

1 is a state diagram showing an environment in which a multi-satellite signal is present in any X region;

2 is a state diagram showing an environment in which a multi-satellite signal exists in any Y region;

3 is a configuration diagram of an active antenna for receiving multi-satellite signal movement according to the present invention;

Figure 4 is an internal configuration of the beam forming module according to the present invention,

5 is an internal configuration diagram of a tracking signal detector according to the present invention;

6 is an internal configuration diagram of a multi-satellite tracking controller according to the present invention;

7 is a tracking control flowchart for multi-satellite signal movement reception according to the present invention.

※ Explanation of time code in main part of drawing ※

1: Radom, 2: Radiation Module

3: active channel module 4: beam forming module

5: frequency converter 6: signal distributor

7: polarization selection signal separator 8: tracking signal detector

9: Multi-Satellite Tracking Controller 10: Rotary Joiner

11: azimuth drive device 12: elevation drive device

13: angular velocity detector 14: satellite receiver

15: mobile power

According to the present invention for achieving the above object, a driving device for converting the elevation module and the azimuth and azimuth angle of the radiation module for receiving a signal from the satellite and control the operation of the drive device so that the radiation module is directed to the tracking target satellite A satellite system comprising a satellite tracking controller, the satellite tracking controller comprising: a detection circuit for detecting whether a satellite selection signal is input by a user; And a main processor for generating a control signal for controlling the driving device so that the tracking target satellite is replaced according to the detected satellite selection signal and the radiation module is directed to the replaced tracking satellite. This is provided.

In addition, the first step of receiving the desired satellite information and the polarization selection signal from the outside; A second step of receiving the output of the first step, detecting the polarization selection signal and the satellite selection signal, selecting a desired polarization, providing the desired polarization to the beam forming module, and determining a tracking frequency and a bandwidth; A third step of receiving the output of the second step and providing the tracking frequency and bandwidth selection signal to a tracking signal detector; A fourth step of detecting the tracking signal voltage while receiving the output of the third step while controlling the azimuth and elevation angle driving devices with respect to the tracking range; A fifth step of receiving and outputting the output of the fourth step to determine and maintain a desired satellite signal using elevation angles and azimuth information according to positions stored therein by using the detected tracking signal voltage and input satellite information; A sixth step of controlling the phase state of the phase shifter of the beam forming module by receiving the output of the fifth step to generate four beams up, down, left, and right and detecting the size of each beam; A seventh step of determining whether the automatic tracking mode is received from the strength of the tracking signal voltage by receiving the output of the sixth step, determining whether the tracking mode is repeated if negative, and performing repeated tracking if positive; An eighth step of returning to the fourth step if the determination result of the seventh step is not the repeat tracking mode; A ninth step of comparing the size of the upper beam with the size of the lower beam in the automatic tracking mode and moving the antenna beam upward by electron beam control and elevation driving control when the determination result of the seventh step is positive; Performing a ninth step and determining whether the size of the left beam is larger than that of the right beam, and if it is positive, moving the antenna beam to the left by the electron beam control and the elevation driving control; An eleventh step of moving the antenna beam down by the electron beam control and the elevation driving control if the determination result of the seventh step is negative; A twelfth step of moving the antenna beam to the right by the electron beam control and the elevation driving control if the determination result of the ninth step is negative; And a thirteenth step of performing the seventh, tenth and twelfth steps and feeding back to the sixth step.

Hereinafter, with reference to the accompanying drawings will be described in more detail "active antenna device and tracking method for multi-satellite signal movement reception" according to an embodiment of the present invention.

3 is a configuration diagram of an active antenna for multi-satellite signal movement reception according to the present invention. Referring to Figure 3, the radome (1) to protect the system from the outside, the radiation module (2) capable of receiving double polarized wave and can receive multiple satellite signals, active to amplify the received satellite signal low noise Channel module (3), beam shaping module (4) for controlling phase of phase shifter, multi-satellite tracking controller (9) for controlling tracking of satellite signals of desired polarization among multiple satellite signals during movement and frequency converter (5), signal divider (6), polarization selection signal separator (7), tracking signal detector (8), rotary joiner (10), azimuth driver (11), elevation driver (12), angular velocity detector (13) ), Including the satellite receiver 14, the mobile power supply 15, which will be described in detail as follows,

First, multiple satellite signals are input to the radiation module 2 through the radome (1). The radiation module is a planar array antenna capable of receiving radio waves of dual polarization and has four equally divided output terminals, each output providing a dual polarized satellite signal to each of the active channel modules 3. . Each active channel module 3 low noise amplifies the received satellite signal and provides the beam shaping module 4 to the beam shaping module 4 and is polarized from the multi-satellite tracking controller 9 via the beam shaping module 4. It selects the desired polarization according to the control signal. The beamforming module 4 receives satellite signals of desired polarization from each active channel, combines the signals passing through the phase shifter of each channel in the beamforming module, and provides them to the frequency converter 5. In addition, the beam shaping module 4 receives a beam control signal from the multi-satellite tracking controller 9 to control the phase of the phase shifter to generate beams in the up, down, left, and right directions, and the electronic beams in the desired direction during the movement. And a polarization control signal received from the multi-satellite tracking controller 9 and multiplexed with a satellite reception signal to provide the active channel module 3 to the active channel module 3.

The frequency converter 5 converts the satellite signal into a satellite receiver input signal and provides it to the signal distributor 6. The signal divider 6 distributes the satellite signal output from the frequency converter 5 in two directions, one of which is provided to the polarization selection signal separator 7 and the other signal is provided to the tracking signal detector 8. To provide. The polarization selection signal separator 7 receives the satellite reception signal from the signal distributor 6 and provides the received signal to the rotary joint 10, and separates the polarization selection signal from the rotary joint 10 from the satellite reception signal. It serves to provide the satellite tracking controller (9).

The tracking signal detector 8 receives a tracking frequency selection signal and a tracking signal bandwidth signal from the multi-satellite tracking controller 9, selects a tracking frequency, converts the tracking frequency into an intermediate frequency, and converts the power of the received tracking signal into an optical dynamic signal detector. And the analog tracking signal voltage is provided to the multi-satellite tracking controller 9. In particular, the tracking signal detector 8 has a fast response characteristic in order to increase the wideband dynamic range and tracking performance so as to detect a wide range of received signals received from a plurality of satellites and temperature changes.

The multi-satellite tracking controller 9 controls to track a satellite signal of a desired polarization out of the multiple satellite signals during the movement. The multi-satellite tracking controller 9 detects the polarization control signal from the polarization selection signal separator 7 and the satellite selection signal from the rotary joint 10, and selects a selection signal of a desired tracking frequency and a bandwidth signal of the tracking signal. The tracking signal detector 8 is provided. In addition, the multi-satellite tracking controller 9 uses an internal control algorithm to receive a desired satellite signal during the movement by using the tracking signal voltage of the tracking signal detector 8 and the angular velocity detection signal of the angular velocity detector 13. Accordingly, an electron beam control signal, an azimuth driving control signal, and an elevation driving control signal are generated and provided to the beam forming module 4, the azimuth driving device 11, and the elevation driving device 12, respectively, to track a desired satellite signal. .

4 is an internal configuration diagram of the beam forming module 4 of FIG. 3 according to the present invention. Referring to FIG. 4, the beamforming module includes four polarization control signal multiplexers 401-404, four phase shifters 405-408, and a power combiner 409. As follows.

The four received satellite signals are passed through the polarization control signal multiplexers 401 to 404 and the satellite shifters 405 to 408, respectively, and then summed by the power combiner 409 to output satellite signals. . The input polarization control signal is multiplexed to the satellite reception signal by each of the polarization control signal multiplexers and transmitted to the active channel module. The polarization control signal multiplexer controls the phase value of each phase shifter according to the input beam control signal to electronically move the beam direction of the received signal in the center and up, down, left, and right directions.

5 is an internal configuration diagram of the tracking signal detector 8 of FIG. 3 according to the present invention. Referring to FIG. 5, the tracking signal detector includes a dual band tuner 801 and an optical dynamic signal detector 802, which will be described in detail as follows.

The dual band tuner 801 receives a tracking frequency and a bandwidth selection signal and converts the signal into an intermediate frequency tracking signal, and the optical dynamic signal detector 802 amplifies and detects the power of the intermediate frequency tracking signal with a log amplifier. Then, the magnitude of the input signal level is detected over a wide range and converted into a tracking voltage.

6 is an internal configuration diagram of the multi-satellite tracking controller of FIG. 3 according to the present invention. Referring to FIG. 6, the multi-satellite tracking controller includes a satellite selection signal separator 91, a satellite selection signal detection circuit 92, a main processor 93, a polarization control signal generation circuit 94, and a polarization selection signal detection circuit ( 95), the elevation drive processing device 96, the azimuth drive processing device 97, the angular velocity detection signal processing device 98 and the electron beam processing device 99, which will be described in detail as follows.

First, the satellite selection signal separator 91 separates the satellite selection signal multiplexed from the rotary joint 10 to the power supply and provides the satellite selection signal to the satellite selection signal detection circuit 92. The satellite selection signal detection circuit 92 receives the satellite selection signal from the satellite selection signal separator 91 and detects the satellite selection signal to provide it to the main processor 93. The polarization selection signal detection circuit 95 receives the polarization selection signal from the rotary joint 10 and detects the polarization selection signal to provide to the main processor 93. The main processor 93 provides a polarization control signal to the polarization selection signal generation circuit 94 from the detected polarization selection signal. The polarization selection signal generating circuit 94 stores the information on each satellite and the elevation angle and azimuth information of each satellite according to a reception position in an internal memory in a table form and stores the input satellite selection signal and the polarization selection signal. To generate a tracking frequency and bandwidth selection signal. In addition, it serves to control the beam of the antenna in the desired direction in accordance with the control flow diagram described in FIG.

The electron beam processing apparatus 99 generates the upper, lower, left and right electron beam control signals to detect the direct error and provides them to the phase shifter of the beam forming module 4, and receives the tracking signal voltage, which is the size of each beam, into a digital signal. In addition, an electron beam control signal for electronically controlling the beam by +/- x degrees in the elevation angle and +/- y degrees in the azimuth direction is generated and provided to the beam forming module 4.

The angular velocity detection signal processing apparatus 98 receives an angular velocity detection signal from the angular velocity detector 13, converts the angular velocity detection signal into a digital signal, and provides it to the main processor 93. The azimuth driving processor 97 receives an azimuth beam control signal from the main processor 93 and provides an azimuth driving control signal to the azimuth driving apparatus 11 of FIG. 3. The elevation drive processing device 96 receives an elevation beam control signal from the main processor 93 and provides an elevation drive control signal to the elevation drive device 12. The main processor 93 detects the satellite tracking error by using the angular velocity detection signal of the angular velocity detection signal processing apparatus 98 and the tracking signal voltage of the electron beam processing apparatus 99 to generate an electron beam and a mechanical driving signal. Via the elevation drive processor 96, the azimuth drive processor 97, and the electron beam processor 99, the beam direction of the antenna is directed in the desired satellite direction.

7 is a tracking control flow diagram for multi-satellite signal movement reception in accordance with the present invention. This will be described in more detail as follows.

First, when power is supplied to the system and operation starts (S1), the satellite information and polarization selection signal are input from the outside (S2) and the process proceeds to S3. In S3, the input polarization control signal is generated and supplied to the beam shaping module 4, and the tracking signal frequency and bandwidth are determined. In S4, the tracking frequency and bandwidth selection signal is supplied to the tracking signal detector 8, and the flow proceeds to S5. In S5, the tracking signal voltage is detected while the azimuth and elevation drivers 11 and 12 are controlled for the tracking range, and then the process proceeds to S6.

In S6, using the tracking signal voltage detected in S5 and the inputted satellite information, a desired satellite signal is determined and obtained using elevation and azimuth information according to a location stored therein, and the process proceeds to S7. In S7, the phase state of the phase shifter of the beam shaping module 4 is controlled to generate four beams of up, down, left and right, and the size of each beam is detected. In S8, it is determined whether the automatic tracking mode is determined from the intensity of the tracking signal voltage, and then, in the automatic tracking mode, the process proceeds to S11; otherwise, the process proceeds to S9.

In S9, it is determined whether the repetitive tracking mode is determined from the strength of the tracking signal voltage, and then, in the repetitive tracking mode, the process proceeds to S10; otherwise, the process proceeds to S5. In S10, after repeating the tracking for a predetermined time by using the angular velocity detection signal, it returns to S7. In S11, the difference between the intensity of the upper beam and the intensity of the lower beam is compared, and if the intensity of the upper beam is large, the process proceeds to S12; otherwise, the process proceeds to S13. In S12, the electron beam control and the driving control are mixed according to the difference in signal strength to move the antenna beam upward, and then the process proceeds to S14.

In S13, the electron beam control and the driving control are mixed according to the difference in the signal strength to move the antenna beam downward, and then the process proceeds to S14. In S14, the difference between the intensity of the left beam and the intensity of the right beam is compared, and if the intensity of the left beam is large, the process proceeds to S15, otherwise, the process proceeds to S16. In S15, the electron beam control and the driving control are mixed according to the difference in the signal strength to move the antenna beam to the left and then return to S7. In S16, the electron beam control and the driving control are mixed according to the difference in the signal strength to move the antenna beam to the right, and then return to S7.

While the invention has been described above based on the preferred embodiments thereof, these embodiments are intended to illustrate rather than limit the invention. It will be apparent to those skilled in the art that various changes, modifications, or adjustments to the above embodiments can be made without departing from the spirit of the invention. Therefore, the protection scope of the present invention should not be limited only by the appended claims, but should be construed to include all such changes, modifications or adjustments.

As described above, unlike the conventional satellite tracking antenna, the present invention can first receive satellite signals of different polarizations of the same satellite, and secondly, while moving in an environment in which multiple satellite signals of the same polarization and the same frequency exist. It is possible to receive the desired satellite signal, and can cope with the change of the received signal level of the satellite, the tracking frequency and the bandwidth of the tracking channel according to the change of the receiving area.

Claims (9)

Moving antenna for receiving a signal from the satellite, a driving device for converting the elevation and azimuth angle of the radiation module and a mobile mounting antenna including a satellite tracking controller for controlling the operation of the driving device to direct the radiation module to the tracking target satellite In the system, The satellite tracking controller, A detection circuit for detecting whether a satellite selection signal is input by a user; And a main processor for generating a control signal for controlling the driving device so that the tracking target satellite is replaced according to the detected satellite selection signal and the radiation module is directed to the replaced tracking satellite. The method of claim 1, The radiation module is configured to receive a dual polarized signal from the tracking target satellite, The satellite tracking controller further includes a detection circuit for detecting whether a polarization selection signal is input from a satellite receiver using the received satellite signal, And the main processor is configured to generate a polarization control signal according to the detected polarization selection signal. The method of claim 2, A beam shaping module for selecting one polarization signal from an active channel module for amplifying the dual polarization signals input from the plurality of radiation modules and a dual polarization signal input from the active channel module according to the polarization control signal input from the main processor and, And a tracking signal detector for detecting a voltage of a received signal supplied from the beam shaping module to the satellite receiver and inputting the received signal to the satellite tracking controller. The main processor of the satellite tracking controller is configured to control the driving device and the beam forming module according to the voltage detector input from the tracking signal detector The method of claim 3, wherein The radiation module is a planar array antenna having four output terminals for receiving a signal of dual polarization and outputting four channels of signals. The active channel module has a four-channel antenna system, characterized in that having a channel The method of claim 3, wherein The beam shaping module receives satellite signals from each active channel module, combines the signals passed through the phase shifters of each channel, supplies them to the satellite receiver, and also generates signals for satellite tracking. The beam control signal is input from the multi-satellite tracking controller to control the phase of each phase shifter to generate beams in the center, up, down, left, and right directions, and generate electronic beams in a desired direction during the movement. Receiving a polarization control signal from the multi-satellite tracking controller multiplexed with the satellite reception signal to provide to the active channel module antenna system for mounting the mobile unit The method of claim 3, wherein The tracking signal detector receives a tracking frequency and a bandwidth selection signal from the satellite tracking controller, selects a tracking signal, and has a wideband dynamic detection range using a log amplifier detector. A first step of receiving desired satellite information and a polarization selection signal from the outside; A second step of receiving the output of the first step, detecting the polarization selection signal and the satellite selection signal, selecting a desired polarization, providing the desired polarization to the beam forming module, and determining a tracking frequency and a bandwidth; A third step of receiving the output of the second step and providing the tracking frequency and bandwidth selection signal to a tracking signal detector; A fourth step of detecting the tracking signal voltage while receiving the output of the third step while controlling the azimuth and elevation angle driving devices with respect to the tracking range; A fifth step of receiving and outputting the output of the fourth step to determine and maintain a desired satellite signal using elevation angles and azimuth information according to positions stored therein by using the detected tracking signal voltage and input satellite information; A sixth step of controlling the phase state of the phase shifter of the beam forming module by receiving the output of the fifth step to generate four beams up, down, left, and right and detecting the size of each beam; A seventh step of determining whether the automatic tracking mode is received from the strength of the tracking signal voltage by receiving the output of the sixth step, determining whether the tracking mode is repeated if negative, and performing repeated tracking if positive; An eighth step of returning to the fourth step if the determination result of the seventh step is not the repeat tracking mode; A ninth step of comparing the size of the upper beam with the size of the lower beam if the automatic tracking mode is larger than the lower beam if the automatic tracking mode determines that the antenna beam is moved upward by the electron beam control and the elevation driving control; Performing a ninth step and determining whether the size of the left beam is larger than that of the right beam, and if it is positive, moving the antenna beam to the left by the electron beam control and the elevation driving control; An eleventh step of moving the antenna beam down by the electron beam control and the elevation driving control if the determination result of the seventh step is negative; A twelfth step of moving the antenna beam to the right by the electron beam control and the elevation driving control if the determination result of the ninth step is negative; And And a thirteenth step of performing the seventh, tenth, and twelfth steps, and returning to the sixth step. The method of claim 7, wherein By generating the upper, lower, left and right beams by controlling the phase shifters connected to each array antenna divided into four equal parts to generate the elevation electron beam control signal and the elevation driving control signal to be equal to each other, Compensating the direction error by generating the azimuth electron beam control signal and the azimuth driving control signal to be equal to each other by comparing the size of the left and right beams. On your computer, A first step of receiving desired satellite information and a polarization selection signal from the outside; A second step of receiving the output of the first step, detecting the polarization selection signal and the satellite selection signal, selecting a desired polarization, providing the desired polarization to the beam forming module, and determining a tracking frequency and a bandwidth; A third step of receiving the output of the second step and providing the tracking frequency and bandwidth selection signal to a tracking signal detector; A fourth step of detecting the tracking signal voltage while receiving the output of the third step while controlling the azimuth and elevation angle driving devices with respect to the tracking range; A fifth step of receiving and outputting the output of the fourth step to determine and maintain a desired satellite signal using elevation angles and azimuth information according to positions stored therein by using the detected tracking signal voltage and input satellite information; A sixth step of controlling the phase state of the phase shifter of the beam forming module by receiving the output of the fifth step to generate four beams up, down, left, and right and detecting the size of each beam; A seventh step of determining whether the automatic tracking mode is received from the strength of the tracking signal voltage by receiving the output of the sixth step, determining whether the tracking mode is repeated if negative, and performing repeated tracking if positive; An eighth step of returning to the fourth step if the determination result of the seventh step is not the repeat tracking mode; A ninth step of comparing the size of the upper beam with the size of the lower beam in the automatic tracking mode and moving the antenna beam upward by electron beam control and elevation driving control when the determination result of the seventh step is positive; Performing a ninth step and determining whether the size of the left beam is larger than that of the right beam, and if it is positive, moving the antenna beam to the left by the electron beam control and the elevation driving control; An eleventh step of moving the antenna beam down by the electron beam control and the elevation driving control if the determination result of the seventh step is negative; A twelfth step of moving the antenna beam to the right by the electron beam control and the elevation driving control if the determination result of the ninth step is negative; And And a thirteenth step of performing the seventh, tenth, and twelfth steps, and returning to the sixth step.