Data transmission and reception systems using dual polarization

Abstract

The present invention provides a data transmission and reception system using dual polarization that enables the efficient use of limited frequency resources by rapidly transmitting and receiving large amounts of data through a dual polarization method composed of vertical and horizontal polarization, without expanding the data link bandwidth or converting the data structure. The data transmission and reception system using dual polarization according to the present invention for this purpose comprises, in a data transmission and reception system using a data link, a modem that generates two forward intermediate frequency signals containing data and distributes the intermediate frequency signals to two independent paths; a first transceiver that converts the forward intermediate frequency signal received from the modem into a forward single frequency signal, wherein the forward single frequency signal is generated as vertical polarization; a second transceiver that converts the forward intermediate frequency signal received from the modem into a forward single frequency signal, wherein the forward single frequency signal is generated as horizontal polarization; an orthogonal mode converter that generates a dual polarization signal by combining the vertical polarization and horizontal polarization input from the first and second transceivers, or receives a dual polarization signal received from the outside by separating it into vertical polarization and horizontal polarization; and an antenna that transmits the dual polarization signal generated by the orthogonal mode converter or receives a signal from the outside.

Description

Technology Field

[0001] The present invention relates to a data transmission and reception system, and more specifically, to a data transmission and reception system using dual polarization that can improve transmission and reception efficiency without increasing bandwidth by transmitting and receiving a single frequency as a dual polarization signal that transmits a vertically polarized signal and a horizontally polarized signal. Background Technology

[0002] A surveillance and reconnaissance system acquired using manned or unmanned aircraft transmits the collected high-capacity and high-resolution data from the aircraft to a designated recipient under control using a Common Data Link (CDL).

[0003] A public data link is a high-speed data link for transmitting Intelligence Surveillance Reconnaissance (ISR) data, such as data collected from surveillance and reconnaissance aircraft, videos, photos, various sensor data, and signal intelligence data, to a designated recipient in real time.

[0004] Therefore, to transmit collected data to a designated recipient in real time using a public data link, it is necessary to configure a system capable of utilizing broadband frequency resources and supporting high transmission speeds to ensure real-time transmission, as well as to use excellent directional antennas to secure coverage range, implement network redundancy, and provide anti-jamming and encryption functions for point-to-point communication.

[0005] Meanwhile, surveillance and reconnaissance data acquired using aircraft is becoming large in volume as it includes various information along with high-resolution image data.

[0006] Accordingly, a data transmission system using a shared data link transmits data via linear polarization by expanding the frequency bandwidth from a single frequency to increase data transmission capacity.

[0007] For example, Korean Registered Patent No. 2398483 proposes a method for performing large-capacity data communication by allocating additional frequencies to the communication link between the mission ground control equipment and the unmanned aerial vehicle when the unmanned aerial vehicle performs a mission requiring large-capacity data communication.

[0008] However, in surveillance and reconnaissance systems operating with limited bandwidth, it is difficult to allocate a sufficiently wide data link bandwidth—the data transmission channel—and to be allocated additional frequencies.

[0009] As such, there is a problem of transmission delay occurring when transmitting large amounts of data within a limited bandwidth, and to prevent a decrease in transmission speed, Korean Patent Publication No. 2662454 has proposed a technology for converting the data structure of a data link.

[0010] However, the method of converting the data structure of the data link has the disadvantage of requiring additional time for the conversion, making it difficult to quickly grasp tactical information and respond immediately.

[0011] Accordingly, technology is required to efficiently transmit large volumes of collected data to destinations within the allocated limited data link bandwidth. Prior art literature

[0012] 1. Korean Registered Patent No. 2398483 "Method and System for Adaptively Allocating High-Capacity Links for Unmanned Aircraft Frequency Allocation" 2. Korean Registered Patent No. 2662454 "Common Data Link Structure for Application to Unmanned Aircraft Systems and Method for Controlling the Same" 3. Korean Registered Patent No. 2631681 "Method and Apparatus for Controlling the Transmission Rate of Mission Equipment in Unmanned Aerial System" The problem to be solved

[0013] The objective of the present invention is to provide a data transmission and reception system using dual polarization that enables the efficient use of limited frequency resources by rapidly transmitting and receiving large amounts of data through a dual polarization method composed of vertical and horizontal polarization, without expanding the data link bandwidth or converting the data structure.

[0014] In addition, the present invention provides a data transmission and reception system using dual polarization that can further improve frequency efficiency by comparing the magnitude and phase of vertical polarization and horizontal polarization when dual polarization is applied, and making the magnitude and phase of vertical polarization and horizontal polarization identical. means of solving the problem

[0015] The data transmission and reception system using dual polarization according to the present invention is a data transmission and reception system using a data link, comprising: a modem that generates two forward intermediate frequency signals containing data and distributes the intermediate frequency signals to two independent paths; a first transceiver that converts the forward intermediate frequency signal received from the modem into a forward single frequency signal; a second transceiver that converts the forward intermediate frequency signal received from the modem into a forward single frequency signal; an orthogonal mode converter that generates the forward single frequency signal input from the first transceiver into vertical polarization and generates the forward single frequency signal input from the second transceiver into horizontal polarization and combines them into dual polarization, or receives a dual polarization signal received from the outside by separating it into vertical polarization and horizontal polarization; and an antenna that transmits the dual polarization signal generated by the orthogonal mode converter to the outside or receives a signal from the outside.

[0016] Additionally, it may further include a magnitude and phase comparison controller that compares the magnitude and phase of a forward single-frequency signal generated by a first transmitter and a forward single-frequency signal generated by a second transceiver, and generates a control signal to correct the frequency magnitude and phase of each forward single-frequency signal so that the magnitude and phase of the two signals become the same, thereby controlling the first and second transceivers.

[0017] At this time, the magnitude and phase comparison controller may include a first splitter that divides a signal input from a first transceiver into two signals, a second splitter that divides a signal input from a second transceiver into two signals, a first detector that detects the magnitude of the signal input from the first splitter, a second detector that detects the magnitude of the signal input from the second splitter, a phase converter that converts the phase of the signal input from the second splitter by 180°, a frequency mixer that combines the signal input from the first splitter and the two signals converted by the phase converter, and a controller that controls the first transceiver and the second transceiver based on the difference in magnitude between the two signals detected by the first detector and the second detector and the signal output from the frequency mixer so that the magnitude and phase of the forward single-frequency signals output from the first transceiver and the second transceiver become identical.

[0018] Additionally, the first and second transceivers may include a frequency upconverter that converts a forward intermediate frequency signal generated by a modem into a forward single frequency signal, a magnitude and phase variable that adjusts the magnitude and phase values ​​of the forward single frequency signal according to a control signal of a magnitude and phase comparison controller, a high-power amplifier that amplifies the forward single frequency signal input from the magnitude and phase variable, a coupler that distributes and outputs a portion of the forward single frequency signal input from the high-power amplifier, a duplexer that separates the forward single frequency signal input from the coupler from the reverse single frequency signal input from the orthogonal mode converter, a low-noise amplifier that amplifies the reverse single frequency signal input from the duplexer, and a frequency downconverter that converts the reverse single frequency input from the low-noise amplifier into a reverse intermediate frequency signal receivable by the modem. Effects of the invention

[0019] According to the present invention, in a data transmission and reception system using a data link, the reliability of a surveillance and reconnaissance system can be improved by efficiently using limited frequency resources to rapidly exchange tactical information and surveillance / reconnaissance image information in real time. Brief explanation of the drawing

[0020] FIG. 1 is a configuration diagram of a data transmission and reception system using dual polarization according to an embodiment of the present invention. Figure 2 is a diagram comparing the transmission characteristics of a single-polarization signal and the transmission characteristics of a dual-polarization signal. FIG. 3 is a detailed configuration diagram of the first transceiver and the second transceiver of FIG. 1. Figure 4 is a detailed configuration diagram of the size and phase comparison controller of Figure 1. Specific details for implementing the invention

[0021] The embodiments described in the present invention and the configurations illustrated in the drawings are merely preferred embodiments of the present invention and do not represent all of the technical concept of the present invention; therefore, the scope of the rights of the present invention should not be interpreted as being limited by the embodiments and drawings described in the text. That is, since the embodiments are subject to various modifications and may take various forms, the scope of the rights of the present invention should be understood to include equivalents capable of realizing the technical concept. Furthermore, the objectives or effects presented in the present invention do not imply that a specific embodiment must include all of them or only such effects; therefore, the scope of the rights of the present invention should not be understood as being limited by them.

[0022] Unless otherwise defined, all terms used herein have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having meanings consistent with the context of the relevant technology and should not be interpreted as having an ideal or overly formal meaning not explicitly defined in this invention.

[0023] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0024] FIG. 1 is a configuration diagram of a data transmission and reception system using dual polarization according to an embodiment of the present invention.

[0025] Referring to FIG. 1, the present invention includes a modem (100), a first transceiver (200), a second transceiver (300), a magnitude and phase comparison controller (400), an orthogonal mode converter (500), and an antenna (600).

[0026] The modem (100) generates two forward intermediate frequency signals containing data and distributes the intermediate frequency signals to two independent paths.

[0027] The first transceiver (200) receives one of two forward frequencies from the modem (100) and generates the received forward intermediate frequency signal into a forward single frequency signal.

[0028] The second transceiver (300) receives one of two forward frequencies from the modem (100) and generates the received forward intermediate frequency signal into a forward single frequency signal.

[0029] The magnitude and phase comparison controller (400) compares the magnitude and phase of the forward single-frequency signal generated by the first transceiver (200) and the forward single-frequency signal generated by the second transceiver (300), and generates a control signal to correct the magnitude and phase of the frequency so that the magnitude and phase of the two forward single frequencies become the same, thereby controlling the first transceiver (200) and the second transceiver (300).

[0030] The orthogonal mode converter (500) converts a forward single-frequency signal input from the first transceiver (200) into vertical polarization and converts a forward single-frequency signal input from the second transceiver (300) into horizontal polarization, and then combines them to generate a dual-polarization signal, or receives a dual-polarization signal received from the outside through the antenna (600) by separating it into vertical polarization and horizontal polarization.

[0031] The antenna (600) transmits a dual-polarized signal generated by the orthogonal mode converter (500) or receives a dual-polarized signal from the outside.

[0032] As such, the present invention transmits data signals in a data link system using a dual polarization method consisting of vertical polarization and horizontal polarization, thereby increasing transmission capacity without expanding the frequency bandwidth and enabling efficient use of frequency resources.

[0033] Figure 2 is a diagram comparing the transmission characteristics of a single-polarized signal and a double-polarized signal.

[0034] Referring to FIG. 2(a), when a single polarization signal is applied, the baud rate of QPSK (Quadrature Phase Shift Keying) is 2 bits, and referring to FIG. 2(b), when a dual polarization signal is applied, the baud rate of QPSK (Quadrature Phase Shift Keying) is 4 bits.

[0035] That is, the present invention can double the transmission capacity compared to when a single polarization signal is used by applying dual polarization.

[0036] Figure 3 is a detailed configuration diagram of the first transceiver and the second transceiver of Figure 1.

[0037] Referring to FIG. 3, the first transceiver (200) and the second transceiver (300) include a frequency up-converter (202, 302), a magnitude and phase variable (204, 304), a high-power amplifier (206, 306), a coupler (208, 308), a duplexer (210, 310), a low-noise amplifier (212, 312), and a frequency down-converter (214, 314).

[0038] The frequency up-converter (202, 302) converts the forward intermediate frequency signal generated by the modem (100) into a forward single frequency signal.

[0039] The magnitude and phase variable (204, 304) adjusts the magnitude and phase values ​​of the forward single-frequency signal according to the control signal of the magnitude and phase comparison controller (400).

[0040] The high-power amplifier (206, 306) amplifies the forward single-frequency signal input from the magnitude and phase variable device (204, 304).

[0041] The coupler (208, 308) distributes and outputs a portion of the forward single-frequency signal input from the high-power amplifier (206, 306).

[0042] The duplexer (210, 310) separates the forward single-frequency signal input from the coupler (208, 308) and the reverse single-frequency signal input from the orthogonal mode converter (500) from each other.

[0043] The low-noise amplifier (212, 312) amplifies the reverse single-frequency signal input from the duplexer (210, 310).

[0044] The frequency down-converter (214, 314) converts the reverse single frequency input from the low-noise amplifier (212, 312) into a reverse intermediate frequency signal receivable by the modem.

[0045] Figure 4 is a detailed configuration diagram of the size and phase comparison controller of Figure 1.

[0046] Referring to FIG. 4, the magnitude and phase comparison controller (400) includes a first divider (402), a second divider (404), a first detector (406), a second detector (408), a phase converter (410), a frequency mixer (412), and a controller (414).

[0047] The first splitter (402) divides the signal input from the first transceiver (200) into two signals, outputting one signal to the first detector (406) and the other signal to the frequency mixer (412).

[0048] The second distributor (404) divides the signal input from the second transceiver into two signals, outputting one signal to the second detector (408) and the other signal to the phase converter (410).

[0049] The first detector (406) detects the magnitude of the signal input from the first distributor (402), and the second detector (408) detects the magnitude of the signal input from the second distributor (404).

[0050] The phase converter (410) converts the phase of the signal input from the second splitter (404) by 180°, and the frequency mixer (412) combines the signal output from the first splitter (402) and the signal converted by the phase converter (410) and outputs it to the controller (414).

[0051] At this time, in the embodiment of the present invention, the signal of the first splitter (402) is output to the frequency mixer (412) and the signal of the second splitter (404) is output to the phase converter (410), but it can be modified and implemented by outputting the signal of the first splitter (402) to the phase converter (410) and the signal of the second splitter (404) to the frequency mixer (412).

[0052] Meanwhile, the frequency mixer (412) has the characteristic that when two signals of the same size and a phase difference of 180° are combined, the output value becomes 0.

[0053] Accordingly, the present invention converts the phase of either the output signal of the first splitter (402) or the output signal of the second splitter (404) by 180°.

[0054] The controller (414) adjusts the magnitude and phase variable (204, 304) so ​​that the magnitude and phase of the output signal of the first detector (406) and the first transceiver (200) and the output signal of the second transceiver (300) become the same, thereby correcting the magnitude and phase of each signal.

[0055] At this time, the controller (414) controls the magnitude and phase variable (204, 304) until the difference in magnitude between the output value of the frequency mixer (412) and the two signals detected by the first detector (406) and the second detector (408) approaches zero.

[0056] The data transmission operation of a data transmission and reception system using dual polarization according to an embodiment of the present invention will be explained with reference to FIGS. 3 and 4 as follows.

[0057] First, the modem (100) receives data such as a tactical message from a data link processor, generates two forward intermediate frequency signals including the received data, and distributes the intermediate frequency signals to two independent paths.

[0058] One of the signals distributed from the modem (100) is received by the first frequency up-converter (202) of the first transceiver (200), and the other is received by the second frequency up-converter (302) of the second transceiver (300).

[0059] The first frequency up-converter (202) and the second frequency up-converter (302) convert the received intermediate frequency signal into a forward single frequency signal.

[0060] The magnitude and phase variable (204, 304) adjusts and outputs the magnitude and phase values ​​of a single frequency signal when there is a control signal from the magnitude and phase comparison controller (400).

[0061] The first high-power amplifier (206) and the second high-power amplifier (206) amplify the signal input from the magnitude and phase variable (204, 304) and output it to the first coupler (208) and the second coupler (308), respectively.

[0062] The first coupler (208) distributes a portion of the forward single-frequency signal input from the first high-power amplifier (206) and outputs it to the magnitude and phase comparison controller (400) or to the first duplexer (210).

[0063] Likewise, the second coupler (308) distributes a portion of the forward single-frequency signal input from the second high-power amplifier (306) and outputs it to the magnitude and phase comparison controller (400) or to the second duplexer (310).

[0064] The first splitter (402) of the magnitude and phase comparison controller (400) divides the signal input from the first coupler (208) into two signals, one of which is output to the first detector (406) and the other is output to the frequency mixer (410).

[0065] Additionally, the second distributor (404) of the magnitude and phase comparison controller (400) divides the signal input from the first coupler (308) into two signals, one of which is output to the second detector (408) and the other is output to the phase converter (410).

[0066] The phase converter (410) converts the phase of the signal input from the second splitter (404) by 180°, and the frequency mixer (412) combines the signal input from the first splitter (402) and the two signals converted by the phase converter (410).

[0067] The controller (414) controls the first magnitude and phase variable (204) and the second magnitude and phase variable (304) based on the difference in magnitude between two signals detected by the first detector (406) and the second detector (408) and the output value of the frequency mixer (412) to adjust the magnitude and phase of the forward single-frequency signal.

[0068] At this time, the controller (414) controls the first magnitude and phase variable (204) and the second magnitude and phase variable (304) until the difference value of the output signals of the first detector (406) and the second detector (408) and the output value of the frequency mixer (412) approach 0.

[0069] Next, the first duplexer (210) and the second duplexer (310) separate the forward single-frequency signal input from the coupler (208, 308) and the reverse single-frequency signal input from the orthogonal mode converter (500).

[0070] The orthogonal mode converter (500) generates signals input from the first transceiver (200) and the second transceiver (300) into vertical polarization and horizontal polarization, respectively, and combines them to generate a dual-polarization signal, and the antenna (600) transmits the signal generated by the orthogonal mode converter (500) to the outside.

[0071] Although the present invention has been described in relation to the preferred embodiments mentioned above, various modifications and variations are possible without departing from the essence and scope of the invention. Accordingly, the appended claims will include such modifications and variations that fall within the essence of the invention. Explanation of the symbols

[0072] 100 : Modem 200 : 1st transceiver 300 : 2nd Transceiver 202, 302: Frequency up-converter 204, 304: Magnitude and phase variable 206, 306: High-power amplifiers 208, 308: Couplers 210, 310: Duplexer 212, 312: Low-noise amplifier 214, 314: Frequency down-converter 400: Magnitude and phase comparison controller 402, 404: Distributors 406, 408: Detectors 410: Phase converter 412: Frequency mixer 414 : Controller

Claims

Claim 1 A data transmission and reception system comprises: a modem that generates two forward intermediate frequency signals containing data and distributes the intermediate frequency signals to two independent paths; a first transceiver that converts a forward intermediate frequency signal received from the modem into a forward single frequency signal; a second transceiver that converts a forward intermediate frequency signal received from the modem into a forward single frequency signal; an orthogonal mode converter that generates a forward single frequency signal input from the first transceiver into vertical polarization and generates a forward single frequency signal input from the second transceiver into horizontal polarization and combines them into dual polarization, or receives a dual polarization signal received from an external source by separating it into vertical polarization and horizontal polarization; and an antenna that transmits the dual polarization signal generated by the orthogonal mode converter or receives a signal from an external source. A data transmission and reception system using dual polarization, further comprising a magnitude and phase comparison controller that compares the magnitude and phase of a forward single-frequency signal generated by the first transceiver and a forward single-frequency signal generated by the second transceiver, and generates a control signal to correct the frequency magnitude and phase of each forward single-frequency signal so that the magnitude and phase of the two signals become identical, thereby controlling the first and second transceivers. Claim 2 delete Claim 3 In claim 1, the magnitude and phase comparison controller comprises: a first splitter that distributes a signal input from the first transceiver into two signals; a second splitter that distributes a signal input from the second transceiver into two signals; a first detector that detects the magnitude of the signal input from the first splitter; a second detector that detects the magnitude of the signal input from the second splitter; a phase converter that converts the phase of the signal input from the second splitter by 180°; a frequency mixer that combines the signal input from the first splitter and the two signals converted by the phase converter; and a controller that controls the first transceiver and the second transceiver based on the magnitude difference between the two signals detected by the first detector and the second detector and the signal output from the frequency mixer so that the magnitude and phase of the forward single-frequency signals output from the first transceiver and the second transceiver become identical. Data transmission and reception system used. Claim 4 A data transmission and reception system using dual polarization according to claim 1, wherein the first and second transceivers comprise: a frequency upconverter that converts a forward intermediate frequency signal generated by the modem into a forward single frequency signal; a magnitude and phase variable that adjusts the magnitude and phase values ​​of the forward single frequency signal according to a control signal of the magnitude and phase comparison controller; a high-power amplifier that amplifies the forward single frequency signal input from the magnitude and phase variable; a coupler that distributes and outputs a portion of the forward single frequency signal input from the high-power amplifier; a duplexer that separates the forward single frequency signal input from the coupler and the reverse single frequency signal input from the orthogonal mode converter; a low-noise amplifier that amplifies the reverse single frequency signal input from the duplexer; and a frequency downconverter that converts the reverse single frequency input from the low-noise amplifier into a reverse intermediate frequency signal receivable by the modem.

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