Antenna connection circuits, devices and unmanned equipment

Abstract

The present application discloses an antenna connection circuit, device and unmanned equipment, the antenna connection circuit includes: a satellite antenna, a cellular antenna, a combiner component, an isolation component, a satellite receiver and a cellular baseband, wherein: the satellite receiver is connected to the first end of the isolation component, the cellular baseband is connected to the second end of the isolation component, the third end of the isolation component is connected to the third end of the combiner component, the first end and the second end of the isolation component are mutually isolated ends, the second end and the third end of the isolation component are mutually conductive ends, and the first end and the third end of the isolation component are mutually conductive ends; the first end of the combiner component is connected to the cellular antenna, and the second end of the combiner component is connected to the satellite antenna; the first end and the third end of the combiner component are mutually conductive ends, the second end and the third end of the combiner component are mutually conductive ends, and the first end and the second end of the combiner component are mutually isolated ends. Through the above technical means, the problem of the complex wiring structure and large volume of the coaxial line inside the communication system in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of unmanned equipment, and in particular to an antenna connection circuit, device and unmanned equipment. Background Art

[0002] The unmanned vehicle is equipped with a cellular communication system that connects to the cloud server, as well as a satellite communication system for positioning and navigation. The unmanned vehicle communicates data via the satellite and cellular communication systems to complete various operational tasks.

[0003] Currently, satellite and cellular communication systems for unmanned equipment are equipped with corresponding signal processing units and antennas. These are connected by coaxial cables, with the antennas receiving wireless signals and the signal processing units processing them. However, because the signal processing units and antennas cannot be located close together, each signal processing unit must be connected to its corresponding antenna via a long coaxial cable. This makes the coaxial cable wiring structure within the communication system complex and bulky, hindering the miniaturization of unmanned equipment, production assembly, and troubleshooting. Summary of the Invention

[0004] The present application provides an antenna connection circuit, device and unmanned equipment, which solves the problem of complex and large wiring structure of coaxial lines inside the communication system in the prior art, reduces the number of coaxial lines and simplifies the wiring structure of the coaxial lines, and reduces the operational difficulty of production, assembly and maintenance.

[0005] In a first aspect, the present application provides an antenna connection circuit, comprising: a satellite antenna, a cellular antenna, a combiner component, an isolation component, a satellite receiver, and a cellular baseband, wherein:

[0006] The satellite receiver is connected to the first end of the isolation component, the cellular baseband is connected to the second end of the isolation component, and the third end of the isolation component is connected to the third end of the combiner component. The first end and the second end of the isolation component are mutually isolated ends, the second end and the third end of the isolation component are mutually conductive ends, and the first end and the third end of the isolation component are mutually conductive ends.

[0007] The first end of the combiner component is connected to the cellular antenna, and the second end of the combiner component is connected to the satellite antenna; the first end and the third end of the combiner component are mutually conductive ends, the second end and the third end of the combiner component are mutually conductive ends, and the first end and the second end of the combiner component are mutually isolated ends.

[0008] In a second aspect, the present application provides an antenna connection device, comprising: a signal processing module, an antenna module, and a single coaxial line, wherein the signal processing module includes a cellular baseband, a satellite receiver, and an isolation component, and the antenna module includes a satellite antenna, a cellular antenna, and a combining component, wherein:

[0009] The satellite receiver is connected to the first end of the isolation component, the cellular baseband is connected to the second end of the isolation component, and the third end of the isolation component is connected to the third end of the combiner component via the single coaxial line. The first end and the second end of the isolation component are mutually isolated ends, the second end and the third end of the isolation component are mutually conductive ends, and the first end and the third end of the isolation component are mutually conductive ends.

[0010] The first end of the combiner component is connected to the satellite antenna, and the second end of the combiner component is connected to the satellite antenna; the first end and the third end of the combiner component are mutually conductive ends, the second end and the third end of the combiner component are mutually conductive ends, and the first end and the second end of the combiner component are mutually isolated ends.

[0011] In a third aspect, the present application provides an unmanned device comprising the antenna connection circuit as described in the first aspect.

[0012] The present application sets the satellite receiver and the cellular baseband at the two isolation ends of the isolation component respectively, so as to isolate the cellular uplink signal sent by the cellular baseband from the satellite receiver through the isolation component, thereby preventing the satellite receiver from receiving a large signal and causing the internal low-noise amplifier to be blocked. The satellite downlink signal and the cellular downlink signal are combined by the combining component for coaxial transmission to the isolation component, and the combined signal is transmitted to the satellite receiver and the cellular baseband through the isolation component, thereby realizing the single coaxial line transmission of the uplink signal and the downlink signal. By transmitting multiple antenna signals through a single coaxial line, the number of coaxial lines is reduced and the wiring structure of the coaxial line is simplified, the operational difficulty of production, assembly and maintenance is reduced, the volume of the communication system is reduced, and it is conducive to the miniaturization of unmanned equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a principle block diagram of an antenna connection circuit provided by one embodiment of the present application;

[0014] Figure 2 This is a first schematic diagram of an antenna connection circuit provided in an embodiment of the present application;

[0015] Figure 3 is a second schematic diagram of the antenna connection circuit provided in an embodiment of the present application;

[0016] Figure 4 is a structural diagram of a first directional coupler provided in an embodiment of the present application;

[0017] Figure 5 is a third schematic diagram of an antenna connection circuit provided in an embodiment of the present application;

[0018] Figure 6 is a structural diagram of a circulator provided in an embodiment of the present application;

[0019] Figure 7 is a fourth schematic diagram of an antenna connection circuit provided in an embodiment of the present application;

[0020] Figure 8 is a structural diagram of an antenna connection device provided in an embodiment of the present application;

[0021] In the figure, 100, satellite receiver; 101, RTK receiver; 200, cellular baseband; 201, LTE baseband; 300, isolation component; 301, first directional coupler; 302, first circulator; 303, second circulator; 304, first coupler; 400, combiner component; 401, second directional coupler; 500, cellular antenna; 501, LTE antenna; 600, satellite antenna; 601, RTK antenna; 602, amplifier; 700, WiFi baseband; 701, first duplexer; 702, second duplexer; 703, WiFi antenna; 800, signal processing module; 801, control unit; 900, antenna module. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application more clear, the specific embodiments of this application are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain this application, rather than to limit this application.

[0023] In the description of the embodiments of this application, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0024] In one embodiment, the cellular communication system carried by the unmanned device is an LTE communication system, the satellite communication system is an RTK positioning system, and the unmanned device is also equipped with a WIFI communication system. Each communication system is equipped with a corresponding antenna and signal processing module. The signal processing module is generally located near the main control board of the unmanned device. The signal processing module is connected to the main control board via an antenna serial port. The antenna is located on the top of the unmanned device, and the antenna and signal processing module are connected via a long coaxial cable. Since the LTE communication system, the RTK positioning system, and the WIFI communication system all require coaxial cables to connect the antenna and the signal processing module, the number of coaxial cables used by the unmanned device is excessive, resulting in cost waste. At the same time, it also increases the weight and volume of the unmanned device, which is not conducive to the miniaturization of the unmanned device. The wiring structure of the coaxial cables between each antenna and the signal processing module is complex, which is not conducive to production assembly and fault repair.

[0025] To solve the above problems, an embodiment of the present application provides an antenna connection circuit.

[0026] In one embodiment, to address the complex coaxial cable wiring issues associated with configuring three coaxial lines to connect antennas and signal processing modules for three communication systems, multiple antenna signals can be combined and then transmitted using a single coaxial line, reducing the number of coaxial lines. Existing methods for combining and transmitting multiple antenna signals use an inter-frequency combiner to combine the multiple antenna signals and then separate the combined signal into multiple antenna signals. Inter-frequency combiners use integrated filters, which cannot guarantee isolation between two antenna signals when their frequencies are close. Therefore, antenna signals with similar frequencies cannot be combined or separated using an inter-frequency combiner. RTK is a dual-band system with a frequency range of 1176-1590 MHz. The frequency used by RTK is close to the 1710 MHz frequency used by LTE Band 3, making existing inter-frequency combiners unsuitable for low-loss combining and separation of RTK L5 and LTE Band 3 antenna signals. Therefore, if the communication system in the existing technology wants to combine the WiFi antenna signal, RTK antenna signal and LTE antenna signal for transmission, the communication system needs to discard the RTK antenna signal or the LTE antenna signal. Otherwise, combined transmission is achieved, making the existing communication system unable to achieve full network communication.

[0027] Therefore, based on the working characteristics of RTK and LTE, this embodiment adopts an isolation component in the antenna connection circuit to combine the RTK and LTE antenna signals through the isolation component while ensuring high isolation between the two, so that the two antenna signals do not affect each other.

[0028] Figure 1 This is a principle block diagram of an antenna connection circuit provided by an embodiment of the present application. Figure 1As shown, the antenna connection circuit includes a satellite antenna 600, a cellular antenna 500, a combiner component 400, an isolation component 300, a satellite receiver 100 and a cellular baseband 200. The satellite receiver 100 is connected to the first end of the isolation component 300, the cellular baseband 200 is connected to the second end of the isolation component 300, and the third end of the isolation component 300 is connected to the third end of the combiner component 400. The first end and the second end of the isolation component 300 are mutually isolated ends, the second end and the third end of the isolation component 300 are mutually conductive ends, and the first end and the third end of the isolation component 300 are mutually conductive ends; the first end of the combiner component 400 is connected to the cellular antenna 500, and the second end of the combiner component 400 is connected to the satellite antenna 600; the first end and the third end of the combiner component 400 are mutually conductive ends, the second end and the third end of the combiner component 400 are mutually conductive ends, and the first end and the second end of the combiner component 400 are mutually isolated ends. When the two ports of an isolation component or a combiner are connected to each other, a signal input from one port can be output from the other port. When the two ports of an isolation component or a combiner are isolated from each other, a signal input from one port cannot be output from the other port. For example, when a signal is input to one end of isolation component 300, the signal is output from the connected end but not from the isolated end. When different signals are simultaneously input to the second and first ends of combiner component 400, the different signals are combined and output from the third end.

[0029] In one embodiment, Figure 2 This is a first schematic diagram of the antenna connection circuit provided by the embodiment of the present application. Figure 2As shown, the combining component 400 is a second directional coupler 401, the cellular antenna 500 is connected to the first end of the second directional coupler 401, the satellite antenna 600 is connected to the second end of the second directional coupler 401, and the third end of the second directional coupler 401 is connected to the third end of the isolation component 300. The first and third ends of the second directional coupler 401 are through-ends, and the second and third ends of the second directional coupler 401 are coupled ends. When a signal is input to one end of the coupler, most of the signal is output from the through-end, and a small portion of the signal is output from the coupled end. Exemplarily, the satellite antenna 600 is an RTK antenna 601, the cellular antenna 500 is an LTE antenna 501, the satellite downlink signal is an RTK downlink signal, and the cellular downlink signal is an LTE downlink signal. The RTK antenna 601 is used to receive the RTK downlink signal and transmit it to the second end of the second directional coupler 401, and the LTE antenna 501 is used to receive the LTE downlink signal and transmit it to the first end of the second directional coupler 401. When the first end of the second directional coupler 401 receives an LTE downlink signal and the second end receives an RTK downlink signal, the third end of the second directional coupler 401 combines the LTE downlink signal and the RTK downlink signal and then transmits the combined signal to the isolation component 300 via a single coaxial line. The isolation component 300 transmits the LTE downlink signal and / or the RTK downlink signal to the LTE baseband 201 and the RTK receiver 101, thus achieving coaxial transmission of multiple downlink signals.

[0030] It should be noted that combiner assembly 400 also uses a conventional three-port coupler. To eliminate signal reflection at each port of a conventional coupler, the impedance of the signal input port must be equal to the parallel value of the impedances of the other ports. However, if every port can serve as a signal input port, it is impossible to determine the optimal impedance design. However, when combiner assembly 400 uses a directional coupler, the ports are not directly connected, which eliminates signal reflection at each port and improves energy efficiency.

[0031] In one embodiment, the satellite receiver 100 is an RTK receiver 101, and the cellular baseband 200 is an LTE baseband 201. The RTK receiver 101 is used to receive RTK downlink signals transmitted by the RTK antenna 601, and the LTE baseband 201 is used to receive LTE downlink signals transmitted by the LTE antenna 501 and to transmit LTE uplink signals to the LTE antenna 501. Because the RTK receiver 101 only receives but does not transmit, the only signal that can interfere with the RTK downlink signal is the LTE uplink signal. If the LTE uplink signal is not isolated from the RTK receiver 101, a larger LTE uplink signal will enter the RTK receiver 101, blocking the low-noise amplifier within the RTK receiver and causing the RTK receiver 101 to malfunction. Therefore, the signal entering the RTK receiver 101 must be sufficiently small, for example, less than 0 dBm. The LTE downlink signal received by LTE antenna 501 is typically low, such as -60dBm. The RTK downlink signal received by RTK antenna 601 is also relatively low, for example, less than -125dBm. Even after amplification and attenuation, the RTK downlink signal is still relatively low, for example, less than -100dBm, before reaching RTK receiver 101. Therefore, the RTK downlink signal and the LTE downlink signal will not block the low-noise amplifier within RTK receiver 101. Therefore, to achieve coaxial transmission of LTE and RTK signals, the LTE uplink signal must be isolated from the RTK receiver 101.

[0032] In this embodiment, the RTK receiver 101 is connected to the first end of the isolation component 300, and the LTE baseband 201 is connected to the second end of the isolation component 300. The first and second ends of the isolation component 300 are mutually isolated. The signals at the first and second ends of the isolation component 300 cannot communicate with each other, so the LTE uplink signal sent by the LTE baseband 201 cannot be transmitted to the RTK receiver 101, achieving high isolation between the LTE uplink signal and the RTK receiver 101. Furthermore, the third end of the second directional coupler 401 is connected to the third end of the isolation component 300. The third end and the first end of the isolation component 300 are mutually conductive, and the third end and the second end are mutually conductive. That is, the signals at the third end and the first end can communicate with each other, and the signals at the third end and the second end can also communicate with each other. Therefore, the RTK downlink signal and / or LTE downlink signal transmitted from the third end of the second directional coupler 401 to the third end of the isolation component 300 via a single coaxial line can be transmitted to the RTK receiver 101 and the LTE baseband 201. The LTE uplink signal transmitted by the LTE baseband 201 to the second end of the isolation component 300 can also be normally transmitted to the combining component 400, thereby realizing coaxial transmission of the LTE signal and the RTK signal.

[0033] In one embodiment, when the first and second ends of the combiner assembly 400 simultaneously receive an LTE downlink signal transmitted by the LTE antenna and an RTK downlink signal transmitted by the RTK antenna, the two downlink signals are combined and transmitted via a single coaxial line and isolation assembly 300 to the RTK receiver 101 and LTE baseband 201. The downlink signals are then separated internally by the RTK receiver 101 and LTE baseband 201. In this embodiment, the satellite receiver 100 includes a first mixing module and a first filtering module. The first mixing module is configured to mix the signal received by the satellite receiver 100 into a first intermediate frequency signal, and the first filtering module is configured to filter the first intermediate frequency signal to obtain a satellite downlink signal. Similarly, the cellular baseband 200 includes a second mixing module and a second filtering module. The second mixing module is configured to mix the signal received by the cellular baseband 200 into a second intermediate frequency signal, and the second filtering module is configured to filter the second intermediate frequency signal to obtain a cellular downlink signal. For example, although the RTK receiver 101 receives both the RTK downlink signal and the LTE downlink signal, the mixed intermediate frequency signal is not within the intermediate frequency bandwidth of the LTE downlink signal, and thus the LTE downlink signal can be filtered out. Similarly, although the LTE baseband 201 receives both the RTK downlink signal and the LTE downlink signal, the mixed intermediate frequency signal is not within the intermediate frequency bandwidth of the RTK downlink signal, and thus the RTK downlink signal can be filtered out.

[0034] In one embodiment, Figure 3 This is a second schematic diagram of the antenna connection circuit provided in the embodiment of the present application. Figure 3 As shown, the isolation component 300 is a first directional coupler 301, the satellite receiver 100 is connected to the first end of the first directional coupler 301, the cellular baseband 200 is connected to the second end of the first directional coupler 301, and the third end of the first directional coupler 301 is connected to the third end of the combiner component 400. The first end and the second end of the first directional coupler 301 are mutually isolated ends, the first end and the third end of the first directional coupler 301 are mutually coupled ends, and the second end and the third end of the first directional coupler 301 are mutually direct ends. For example, Figure 4 Schematic diagram of the structure of the first directional coupler provided in the embodiment of the present application. Figure 4As shown, terminals A and B of the first directional coupler 301 serve as through-ports, terminals C and D serve as through-ports, terminals A and C serve as isolated ports, terminals B and D serve as isolated ports, terminals B and C serve as coupled ports, and terminals A and D serve as coupled ports. If a signal is input from one end of the first directional coupler 301, most of the signal is output from the through-port, a small portion is output from the coupled port, and no signal is output from the isolated port. Therefore, when the RTK receiver 101 and the LTE baseband 201 are connected to terminals C and A of the first directional coupler 301, which serve as isolated ports, the first directional coupler 301 isolates the LTE uplink signal transmitted by the LTE baseband 201 from the RTK receiver 101. When the LTE baseband 201 and the combiner assembly 400 are connected to the A and B ends of the first directional coupler 301, which are the through ends, the first directional coupler 301 sends the downlink signal transmitted by the combiner assembly 400 to the LTE baseband 201, and the first directional coupler 301 transmits the LTE uplink signal transmitted by the LTE baseband 201 to the combiner assembly 400. When the RTK receiver 101 and the combiner assembly 400 are connected to the C and B ends of the first directional coupler 301, which are the coupled ends, the first directional coupler 301 sends the downlink signal transmitted by the combiner assembly 400 to the RTK receiver 101.

[0035] In one embodiment, Figure 5 : is a third schematic diagram of the antenna connection circuit provided in the embodiment of the present application. Figure 5 As shown, the isolation component 300 includes a first circulator 302, a second circulator 303 and a first coupler 304, wherein: the cellular baseband 200 is connected to the first end of the first circulator 302, the second end of the first circulator 302 is connected to the first end of the second circulator 303, the second end of the second circulator 303 is connected to the third end of the combiner component 400, the third end of the second circulator 303 is connected to the first end of the first coupler 304, the second end of the first coupler 304 is connected to the satellite receiver 100, and the third end of the first coupler 304 is connected to the third end of the first circulator 302; the first end, the second end and the third end of the first circulator 302 are arranged in a clockwise direction, the first end, the second end and the third end of the second circulator 303 are arranged in a clockwise direction, the first end and the second end of the first coupler 304 are coupled ends to each other, and the first end and the third end of the first coupler 304 are straight-through ends to each other. For example, Figure 6 This is a schematic diagram of the structure of the circulator provided in the embodiment of the present application. Figure 6As described above, the circulator's E, F, and G terminals are arranged clockwise in sequence. Signals input to the E terminal are output from the F terminal, signals input to the F terminal are output from the G terminal, and signals input to the G terminal are output from the E terminal. When the LTE uplink signal transmitted by the LTE baseband 201 is input from the E terminal of the first circulator 302 and output from the F terminal of the first circulator 302, then input from the E terminal of the second circulator 303 and output from the F terminal of the second circulator 303, the LTE uplink signal is transmitted to the combiner assembly 400. Because the RTK receiver 101 is connected to the G terminal of the second circulator 303 via the first coupler 304, the LTE uplink signal input from the E terminal of the second circulator 303 does not enter the RTK receiver 101, thus isolating the RTK receiver 101 from the LTE uplink signal. Furthermore, the RTK downlink signal and / or LTE downlink signal transmitted by the third terminal of the combiner assembly 400 is input from the F terminal of the second circulator 303 and output from the G terminal to the first terminal of the first coupler 304. The RTK receiver 101 is connected to the second end of the first coupler 304. The first coupler 304 transmits a small portion of the RTK downlink signal and / or LTE downlink signal to the RTK receiver 101. The first coupler 304 inputs the majority of the RTK downlink signal and / or LTE downlink signal to the G end of the first circulator 302. The E end of the first circulator 302 transmits the RTK downlink signal and / or LTE downlink signal to the LTE baseband 201, thus achieving coaxial transmission of multiple signals.

[0036] In this embodiment, the coupler in the isolation component 300 may be a low-coupling coupler, such as a -10 dB coupler, to prevent the LTE downlink signal from affecting the receiving sensitivity due to excessive attenuation during the downlink process.

[0037] In this embodiment, reference Figure 3 and Figure 5 The antenna connection circuit 400 further includes an amplifier 602. The satellite antenna 600 is connected to a first end of the amplifier 602, and a second end of the amplifier 602 is connected to a second end of the second directional coupler 401. For example, because the signal link from the RTK antenna 601 to the RTK receiver 101 is always provided at the coupling end of the coupler or the first directional coupler 301, the power of the RTK downlink signal will be attenuated when passing through the coupler or the first directional coupler 301. Therefore, the amplifier 602 is provided to amplify the RTK downlink signal to prevent the attenuation of the RTK downlink signal from reducing the receiving sensitivity of the RTK receiver 101.

[0038] It should be noted that since the LTE antenna 501 is a passive antenna, if excessive insertion loss is introduced into the LTE signal link, the loss of the LTE uplink signal can be compensated by increasing the transmit power of the LTE baseband 201. However, the loss of the LTE downlink signal will directly affect the receiving sensitivity of the LTE baseband 201. For example, if the receiving sensitivity of the LTE baseband 201 is relatively low, such as -120dBm, if the loss from the LTE antenna 501 to the LTE baseband 201 is relatively low, such as 1dB, then the receiving sensitivity of the LTE baseband 201 is -119dBm. However, if the loss is relatively high, such as 10dBm, then the receiving sensitivity of the LTE baseband 201 will drop to -110dBm. Therefore, the signal link from the LTE antenna 501 to the LTE baseband 201 is always set at the through end of the coupler or directional coupler to prevent the loss of the LTE downlink signal from affecting the receiving sensitivity. The RTK antenna 601 is an active antenna, and the RTK downlink signal can be amplified by the amplifier 602. Even after attenuation by the coupler or directional coupler, the amplified RTK downlink signal remains stronger than when received by the RTK antenna 601, without reducing the receiving sensitivity of the RTK receiver 101. Therefore, even if the signal link from the RTK antenna 601 to the RTK receiver 101 is always set at the coupling end of the coupler or directional coupler, the receiving sensitivity of the RTK receiver 101 to the RTK downlink signal will not be affected.

[0039] In another embodiment, if the LTE antenna 501 is an active antenna, the signal link from the LTE antenna 501 to the LTE baseband 201 can be set up at the coupling end of a coupler or directional coupler. Although the coupling end of the coupler or directional coupler will cause significant loss to the LTE downlink signal, an amplifier can be installed on the LTE antenna side to amplify the LTE downlink signal. Similarly, even after attenuation by the coupler or directional coupler, the amplified LTE downlink signal can still be stronger than when received by the LTE antenna 601, without reducing the receiving sensitivity of the LTE baseband 201.

[0040] In one embodiment, when the unmanned equipment is equipped with a WIFI communication system, since the WIFI signal is mainly distributed in the 2.4G and 5G frequency bands, the frequency difference between the WIFI signal and the LTE signal is large, and the frequency difference between the WIFI signal and the RTK signal is also large. Therefore, the WIFI signal and the other two signals can be combined or isolated through a duplexer. The WIFI signal can be combined with the combined signal of the LTE signal and the RTK signal through a duplexer and transmitted to another duplexer, and the WIFI signal can be separated from the combined signal of the LTE signal and the RTK signal through another duplexer and the WIFI signal can be transmitted to the WIFI baseband, and the combined signal of the LTE signal and the RTK signal can be transmitted to the LTE baseband and the RTK receiver to achieve coaxial transmission of these three signals. In this embodiment, Figure 7 : is a fourth schematic diagram of the antenna connection circuit provided in the embodiment of the present application. Figure 7 As shown, the antenna connection circuit also includes: a WIFI baseband 700, a first duplexer 701, a second duplexer 702 and a WIFI antenna 703. The WIFI baseband 700 is connected to the first end of the first duplexer 701, the third end of the isolation component 300 is connected to the second end of the first duplexer 701, the third end of the first duplexer 701 is connected to the third end of the second duplexer 702, the first end of the second duplexer 702 is connected to the third end of the combiner component 400, and the second end of the second duplexer 702 is connected to the WIFI antenna 703.

[0041] Exemplarily, the WIFI baseband 700 sends the WIFI uplink signal to the first end of the first duplexer 701, the isolation component 300 sends the LTE uplink signal to the second end of the first duplexer 701, and the first duplexer 701 combines the WIFI uplink signal and the LTE uplink signal and outputs it from the third end. A single coaxial line is provided between the first duplexer 701 and the second duplexer 702. The first duplexer 701 transmits the combined signal to the third end of the second duplexer 702 via the single coaxial line. The second duplexer 702 separates the WIFI uplink signal and the LTE uplink signal in the combined signal, outputs the WIFI uplink signal from the second end, and outputs the LTE uplink signal from the first end. The WIFI uplink signal is transmitted to the WIFI antenna 703, and the LTE uplink signal is transmitted to the LTE antenna 501, thus achieving coaxial transmission of multiple uplink signals.

[0042] Furthermore, the WiFi antenna 703 transmits the WiFi downlink signal to the second end of the second duplexer 702. The combiner 400 transmits the RTK downlink signal and / or the LTE downlink signal to the first end of the second duplexer 702. The second duplexer 702 combines the WiFi downlink signal with the RTK downlink signal and / or the LTE downlink signal and outputs it from the third end. The second duplexer 702 transmits the combined signal to the third end of the first duplexer 701 via a single coaxial line. The first duplexer 701 combines the WiFi downlink signal with the RTK downlink signal and / or the LTE downlink signal in the combined signal and outputs the RTK downlink signal and / or the LTE downlink signal from the second end and the WiFi downlink signal from the first end. The WiFi downlink signal is transmitted to the WiFi baseband 700, and the RTK downlink signal and / or the LTE downlink signal are transmitted to the LTE baseband 201 and the RTK receiver 101. The LTE baseband 201 and the RTK receiver 101 separate the mixed signal internally, thus achieving coaxial transmission of multiple downlink signals.

[0043] In this embodiment, due to the large frequency gap between LTE and Wi-Fi signals, the duplexer loss is small, for example, set to 0.3 dB. The loss between the second directional coupler 401 and the first directional coupler 301 is large, for example, set to 10 dB, or the loss between the first coupler 304 and the second directional coupler 401 is large, for example, set to 10 dB. The amplification factor of amplifier 602 is set to, for example, 40 dB, so that the RTK downlink signal received by the RTK receiver is greater than the downlink signal received by the RTK antenna. For example, the RTK downlink signal is amplified by 40 dB by amplifier 602, then loses 10 dB by the second directional coupler 401, loses 0.6 dB by the first duplexer 701 and the second duplexer 702, and loses 10 dB by the first directional coupler 301 or the first coupler 304. Finally, the RTK downlink signal still has a gain of 19.4 dB greater than the original signal, ensuring the receiver sensitivity of the RTK downlink signal. In this embodiment, when the coupling coefficient between the coupler and the first directional coupler 301 is 10dB, the differential loss at the through-port is 0.4dB. Therefore, the loss during transmission of the LTE uplink or downlink signal is 1.4dB, which has a minimal impact. The Wi-Fi uplink or downlink signal only passes through two duplexers, resulting in a loss of 0.6dB, which also has a minimal impact. The antenna connection circuit provided in this embodiment can ensure signal reception sensitivity.

[0044] In summary, the antenna connection circuit provided in the embodiment of the present application, by respectively arranging the satellite receiver 100 and the cellular baseband 200 at the two isolation ends of the isolation component 300, isolates the cellular uplink signal sent by the cellular baseband 200 from the satellite receiver 100 through the isolation component 300, thereby preventing the satellite receiver 100 from receiving a large signal and causing the internal low-noise amplifier 602 to be blocked. The satellite downlink signal and the cellular downlink signal are combined by the combining component 400 for coaxial transmission to the isolation component 300, and the combined signal is transmitted to the satellite receiver 100 and the cellular baseband 200 through the isolation component 300, thereby realizing single coaxial line transmission of the uplink signal and the downlink signal. By transmitting multiple antenna signals through a single coaxial line, the number of coaxial lines is reduced and the wiring structure of the coaxial line is simplified, the operational difficulty of production assembly and maintenance is reduced, the volume of the communication system is reduced, and it is conducive to the miniaturization of unmanned equipment.

[0045] Based on the above embodiments, Figure 8 Schematic diagram of the structure of the antenna connection device provided in the embodiment of the present application. Figure 8 As shown, the antenna connection device includes a signal processing module 800, an antenna module 900 and a single coaxial line. The signal processing module 800 includes a cellular baseband 200, a satellite receiver 100 and an isolation component 300. The antenna module 900 includes a satellite antenna 600, a cellular antenna 500 and a combiner component 400. The satellite receiver 100 is connected to a first end of the isolation component 300, the cellular baseband 200 is connected to a second end of the isolation component 300, and the third end of the isolation component 300 is connected to the combiner component 400 via a single coaxial line. 00, the first end and the second end of the isolation component 300 are isolation ends, the second end and the third end of the isolation component 300 are conductive ends, and the first end and the third end of the isolation component 300 are conductive ends; the first end of the combining component 400 is connected to the satellite antenna 600, and the second end of the combining component 400 is connected to the satellite antenna 600; the first end and the third end of the combining component 400 are conductive ends, the second end and the third end of the combining component 400 are conductive ends, and the first end and the second end of the combining component 400 are isolation ends.

[0046] In one embodiment, reference Figure 8The signal processing module 800 further includes a control unit 801, a WIFI baseband 700, and a first duplexer 701. The antenna module 900 further includes a second duplexer 702 and a WIFI antenna 703. The WIFI baseband 700 is connected to the first end of the first duplexer 701, the third end of the isolation component 300 is connected to the second end of the first duplexer 701, the third end of the first duplexer 701 is connected to the third end of the second duplexer 702, the first end of the second duplexer 702 is connected to the third end of the combiner component 400, and the second end of the second duplexer 702 is connected to the WIFI antenna 703. The control unit 801 is connected to the WIFI baseband 700, the cellular baseband 200, and the satellite receiver 100.

[0047] Exemplarily, the antenna module is used to receive downlink signals through the cellular antenna 500, the satellite antenna 600, and the WiFi antenna 703, and then combine the downlink signals and transmit them to the signal processing module 800 via a single coaxial line. The signal processing module 800 separates the combined signal into downlink signals for multiple antennas and sends them to the main control board in sequence through the control unit 801. The signal processing module 800 receives the signal transmission instruction from the main control board, controls the WiFi baseband 700 and the cellular baseband 200 to transmit uplink signals according to the signal transmission instruction, and combines the two uplink signals and transmits them to the antenna module 900 via a channel. The antenna module 900 separates the combined signal and sends the corresponding uplink signal through the WiFi antenna 703 and the cellular antennas 500500.

[0048] In summary, the antenna connection device provided in the embodiments of the present application reduces the size of the antenna terminal by integrating the WIFI antenna 703, cellular antenna 500, and satellite antenna 600 into an antenna module 900. The WIFI baseband 700, cellular baseband 200, and satellite receiver 100 are integrated into a signal processing module 800 to reduce the size of the signal processing terminal. Connecting the signal processing module 800 and antenna module 900 via a single coaxial line reduces the number of coaxial lines and simplifies the wiring structure of the coaxial line, facilitating production assembly and troubleshooting, and facilitating the miniaturization of unmanned equipment.

[0049] Based on the above embodiments, an embodiment of the present application also provides an unmanned device, which is provided with an antenna connection circuit as provided in the above embodiments, and data communication is performed through the antenna connection circuit to realize the miniaturization of the unmanned device.

[0050] As described above, an antenna connection device equipped with an antenna connection circuit is installed in the unmanned equipment. By placing the satellite receiver 100 and the cellular baseband 200 at the two isolated ends of the isolation assembly 300, the isolation assembly 300 isolates the cellular uplink signal transmitted by the cellular baseband 200 from the satellite receiver 100, thereby preventing the satellite receiver 100 from receiving a large signal and blocking the internal low-noise amplifier 602. The satellite downlink signal and the cellular downlink signal are combined by the combiner assembly 400 and coaxially transmitted to the isolation assembly 300. The combined signal is then transmitted to the satellite receiver 100 and the cellular baseband 200 via the isolation assembly 300, thus achieving single-coaxial transmission of the uplink and downlink signals. Transmitting multiple antenna signals through a single coaxial line reduces the number of coaxial lines and simplifies the wiring structure of the coaxial lines, making production, assembly, and maintenance operations easier and reducing the size of the communication system, thus facilitating the miniaturization of the unmanned equipment.

[0051] The above are only preferred embodiments of the present application and the technical principles employed. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions that are possible for those skilled in the art will not depart from the scope of protection of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments and may include more other equivalent embodiments without departing from the concept of the present application. The scope of the present application is determined by the scope of the claims.

Claims

1. An antenna connection circuit, characterized in that: include: Satellite antennas, cellular antennas, combiner components, isolation components, satellite receivers, and cellular basebands, including: The satellite antenna is an RTK antenna, and the cellular antenna is an LTE antenna; The isolation component includes a first circulator, a second circulator, and a first coupler; the cellular baseband is connected to the first end of the first circulator, the second end of the first circulator is connected to the first end of the second circulator, the second end of the second circulator is connected to the third end of the combiner component, the third end of the second circulator is connected to the first end of the first coupler, the second end of the first coupler is connected to the satellite receiver, and the third end of the first coupler is connected to the third end of the first circulator; the first end, the second end, and the third end of the first circulator are arranged in a clockwise direction, the first end, the second end, and the third end of the second circulator are arranged in a clockwise direction, the first end and the second end of the first coupler are coupled ends to each other, and the first end and the third end of the first coupler are through ends to each other; wherein the LTE antenna is a passive antenna; The first end of the combiner component is connected to the cellular antenna, and the second end of the combiner component is connected to the satellite antenna; the first end and the third end of the combiner component are mutually conductive ends, and the second end and the third end of the combiner component are mutually conductive ends.

2. The antenna connection circuit according to claim 1, wherein: The combining component is a second directional coupler, wherein: The cellular antenna is connected to the first end of the second directional coupler, the satellite antenna is connected to the second end of the second directional coupler, and the third end of the second directional coupler is connected to the third end of the isolation component; the first end and the third end of the second directional coupler are through ends, the second end and the third end of the second directional coupler are coupled ends, and the first end and the second end of the second directional coupler are mutually isolated ends.

3. The antenna connection circuit according to claim 2, wherein: The antenna connection circuit further includes an amplifier, the satellite antenna is connected to a first end of the amplifier, and a second end of the amplifier is connected to a second end of the second directional coupler.

4. The antenna connection circuit according to claim 1, wherein: The satellite receiver includes a first frequency mixing module and a first filtering module, wherein: The first mixing module is used to mix the signal received by the satellite receiver into a first intermediate frequency signal; The first filtering module is used to filter the first intermediate frequency signal to obtain a satellite downlink signal.

5. The antenna connection circuit according to claim 1, wherein: The cellular baseband includes a second mixing module and a second filtering module, wherein: The second mixing module is used to mix the signal received by the cellular baseband into a second intermediate frequency signal; The second filtering module is configured to filter the second intermediate frequency signal to obtain a cellular downlink signal.

6. The antenna connection circuit according to claim 1, wherein: The antenna connection circuit further includes: a WIFI baseband, a first duplexer, a second duplexer and a WIFI antenna, wherein: The WIFI baseband is connected to the first end of the first duplexer, the third end of the isolation component is connected to the second end of the first duplexer, the third end of the first duplexer is connected to the third end of the second duplexer, the first end of the second duplexer is connected to the third end of the combiner component, and the second end of the second duplexer is connected to the WIFI antenna.

7. An antenna connection device, characterized in that: include: A signal processing module, an antenna module, and a single coaxial line. The signal processing module includes a cellular baseband, a satellite receiver, and an isolation component. The antenna module includes a satellite antenna, a cellular antenna, and a combiner component. The satellite antenna is an RTK antenna, and the cellular antenna is an LTE antenna; the satellite receiver is connected to the first end of the isolation component, the cellular baseband is connected to the second end of the isolation component, and the third end of the isolation component is connected to the third end of the combiner component via the single coaxial line. The first end and the second end of the isolation component are mutually isolated ends, the second end and the third end of the isolation component are mutually conductive ends, and the first end and the third end of the isolation component are mutually conductive ends; The first end of the combiner component is connected to the satellite antenna, and the second end of the combiner component is connected to the satellite antenna; the first end and the third end of the combiner component are mutually conductive ends, the second end and the third end of the combiner component are mutually conductive ends, and the first end and the second end of the combiner component are mutually isolated ends.

8. An unmanned device, characterized in that: The invention comprises the antenna connection circuit as described in any one of claims 1 to 6.

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