GNSS system and communication device

Abstract

The embodiment of the present application provides a GNSS system and a communication device, the GNSS system comprises: an attenuation unit, a signal amplification unit and a GNSS chip; the output end of the signal amplification unit is connected with the input end of the attenuation unit, and the output end of the attenuation unit is connected with the first input end of the GNSS chip; in the case that the first signal from the GNSS antenna is received at the signal receiving end of the signal amplification unit, the first signal is processed through the signal amplification unit and the attenuation unit to obtain the second signal, and the signal strength of the second signal is within the signal strength range that can be processed by the GNSS chip.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to a GNSS system and communication device. Background Technology

[0002] A Global Navigation Satellite System (GNSS) is an integrated module that includes a GNSS chip. This module does not include an antenna. By connecting this module system to an antenna, it can receive radio frequency signals using the antenna and process the radio frequency signals using the GNSS chip to obtain positioning information.

[0003] Currently, commonly used antenna types include active antennas and passive antennas. When an active antenna is connected to a GNSS system, because the active antenna includes a signal amplification unit, the GNSS system connected to the active antenna does not include a signal amplification unit. This is to prevent the signal received by the active antenna from undergoing two signal amplification units, thus avoiding a signal strength exceeding the signal strength range that the GNSS chip can process. Conversely, when a passive antenna is connected to a GNSS system, because the passive antenna does not include a signal amplification unit, the GNSS system connected to the passive antenna includes a signal amplification unit. This is to prevent the signal received by the passive antenna from bypassing the signal amplification unit, thus avoiding a signal strength range that is less than the signal strength range that the GNSS chip can process. Therefore, different GNSS systems need to be selected depending on the type of antenna used, increasing the maintenance cost of the GNSS system.

[0004] Therefore, there is an urgent need for a feasible solution that can connect to different types of antennas, and where the signals received by the GNSS chip are all within the signal strength range that the GNSS chip can process, even when different types of antennas are connected. Utility Model Content

[0005] This application provides a GNSS system and a communication device, enabling the GNSS system to be adapted to GNSS antenna modules with active antennas and GNSS antennas with passive antennas.

[0006] A first aspect of this application provides a GNSS system for connection to a GNSS antenna to transmit signals received by the GNSS antenna to a GNSS chip in the GNSS system. The GNSS system includes:

[0007] Attenuation unit, signal amplification unit, and the GNSS chip;

[0008] The output terminal of the signal amplification unit is connected to the input terminal of the attenuation unit, and the output terminal of the attenuation unit is connected to the first input terminal of the GNSS chip.

[0009] When the signal receiving end of the signal amplification unit receives a first signal from the GNSS antenna, the first signal is processed by the signal amplification unit and the attenuation unit to obtain a second signal, and the signal strength of the second signal is within the signal strength range that the GNSS chip can process.

[0010] Optionally, the GNSS system further includes:

[0011] The first power supply unit, the first switching unit, and the first DC blocking unit;

[0012] The first end of the first switching unit is connected to the first end of the GNSS antenna, the second end of the first switching unit is connected to the first power supply end of the first power supply unit, the second end of the first DC blocking unit, and the signal receiving end of the signal amplification unit, and the third end of the first switching unit is connected to the first end of the first DC blocking unit.

[0013] When the GNSS antenna is an active antenna, the first end of the first switching unit is connected to the second end of the first switching unit, and the first end of the first switching unit is disconnected from the third end of the first switching unit.

[0014] When the GNSS antenna is a passive antenna and the passive antenna includes a second DC blocking unit, the first end of the first switching unit is connected to the second end of the first switching unit, and the first end of the first switching unit is disconnected from the third end of the first switching unit. The second DC blocking unit is used to block the DC signal output by the first power supply unit.

[0015] When the GNSS antenna is a passive antenna and the passive antenna does not include the second DC blocking unit, the first end of the first switching unit is connected to the third end of the first switching unit, and the first end of the first switching unit is disconnected from the second end of the first switching unit. The first DC blocking unit is used to block the DC signal output by the first power supply unit.

[0016] Optionally, the GNSS system further includes:

[0017] Second power supply unit, second switching unit, third DC blocking unit, fourth DC blocking unit;

[0018] The first end of the second switching unit is connected to the first end of the GNSS antenna, the second end of the second switching unit is connected to the second end of the fourth DC blocking unit, the first end of the third DC blocking unit, and the signal receiving end of the signal amplification unit, the third end of the second switching unit is connected to the first end of the fourth DC blocking unit, and the second end of the third DC blocking unit is connected to the power supply end of the second power supply unit.

[0019] When the GNSS antenna is an active antenna, the first end of the second switching unit is connected to the second end of the second switching unit, and the first end of the second switching unit is disconnected from the third end of the second switching unit. The third DC blocking unit is used to block the first signal from the GNSS antenna.

[0020] When the GNSS antenna is a passive antenna and the passive antenna includes a second DC blocking unit, the first end of the second switching unit is connected to the second end of the second switching unit, and the first end of the second switching unit is disconnected from the third end of the second switching unit. The second DC blocking unit is used to block the DC signal output by the second power supply unit.

[0021] When the GNSS antenna is a passive antenna and the passive antenna does not include the second DC blocking unit, the first end of the second switching unit is connected to the third end of the second switching unit, and the first end of the second switching unit is disconnected from the second end of the second switching unit. The fourth DC blocking unit is used to block the DC signal output by the second power supply unit.

[0022] Optionally, the GNSS system further includes:

[0023] The third switching unit, the third power supply unit, the fifth DC blocking unit, and the sixth DC blocking unit;

[0024] The first end of the GNSS antenna is connected to the first end of the third switching unit. The second end of the third switching unit is connected to the second end of the fifth DC blocking unit, the first end of the sixth DC blocking unit, and the power supply end of the third power supply unit. The second end of the third switching unit is connected to the first end of the fifth DC blocking unit. The second end of the sixth DC blocking unit is connected to the signal receiving end of the signal amplification unit.

[0025] When the GNSS antenna is an active antenna, the first end of the third switching unit is connected to the second end of the third switching unit, and the first end of the third switching unit is disconnected from the third end of the third switching unit. The sixth DC blocking unit is used to block the DC signal from the third power supply unit.

[0026] When the GNSS antenna is a passive antenna and the passive antenna includes a second DC blocking unit, the first end of the third switching unit is connected to the second end of the third switching unit, and the first end of the third switching unit is disconnected from the third end of the third switching unit. The second DC blocking unit is used to block the DC signal output by the third power supply unit.

[0027] When the GNSS antenna is a passive antenna and the passive antenna does not include the second DC blocking unit, the first end of the third switching unit is connected to the third end of the third switching unit, and the first end of the third switching unit is disconnected from the second end of the third switching unit. The fifth DC blocking unit is used to block the DC signal output by the third power supply unit.

[0028] Optionally, the GNSS system further includes:

[0029] Control unit;

[0030] The output terminal of the control unit is connected to the input terminal of the first switch unit. The control unit is used to control the state of the first switch unit. When the first switch unit is in a first state, the first end and the second end of the first switch unit are connected, and the first end and the third end of the first switch unit are disconnected. When the first switch unit is in a second state, the first end and the third end of the first switch unit are connected, and the first end and the second end of the first switch unit are disconnected.

[0031] Optionally, the attenuation unit includes:

[0032] First resistor, second resistor, third resistor;

[0033] The first end of the first resistor is connected to the output end of the signal amplification unit, the second end of the first resistor is connected to the first end of the second resistor and the first end of the third resistor, the second end of the second resistor is grounded, and the second end of the third resistor is connected to the second input end of the GNSS chip.

[0034] Optionally, the attenuation unit includes:

[0035] Fourth resistor, fifth resistor, sixth resistor;

[0036] The output terminal of the signal amplification unit is connected to the first terminal of the fourth resistor and the first terminal of the fifth resistor, respectively. The second terminal of the fifth resistor is connected to the first terminal of the sixth resistor and the third input terminal of the GNSS chip. The second terminal of the fourth resistor is grounded, and the second terminal of the sixth resistor is grounded.

[0037] Optionally, the first switching unit is a switch capable of transmitting radio frequency signals.

[0038] Optionally, the first switching unit is a radio frequency switch.

[0039] Secondly, embodiments of this application provide a communication device, which includes a GNSS system and a GNSS antenna as described in the first aspect.

[0040] In this embodiment, when the signal receiving end of the signal amplification unit in the GNSS system receives a first signal from the GNSS antenna, it processes the first signal using the signal amplification unit and the attenuation unit to obtain a second signal. The signal strength of this second signal is within the signal strength range that the GNSS chip can process. As can be seen from the above steps, when the GNSS system is connected to different types of GNSS antennas, the signals received by the GNSS chip are all within the signal strength range that the GNSS chip can process. This avoids the need to select different GNSS systems when using different types of antennas, thus reducing the maintenance cost of the GNSS system. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of a GNSS system provided in an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of another GNSS system provided in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of another GNSS system provided in an embodiment of this application;

[0045] Figure 4 This is a schematic diagram of another GNSS system provided in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of another GNSS system provided in an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of another GNSS system provided in an embodiment of this application;

[0048] Figure 7This is a schematic diagram of another GNSS system provided in an embodiment of this application;

[0049] Figure 8 This is a schematic diagram of another GNSS system provided in an embodiment of this application;

[0050] Figure 9 This is a schematic diagram of another GNSS system provided in an embodiment of this application;

[0051] Figure 10 A circuit diagram of a GNSS system provided in an embodiment of this application;

[0052] Figure 11 This is a flowchart illustrating the execution of a GNSS system, as provided in an embodiment of this application. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0055] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0056] It should be understood that the signal strength of the radio frequency signal received by the receiving antenna in a GNSS antenna is lower than the range of radio frequency signal strength that the GNSS chip in the GNSS system can process. Therefore, before using the GNSS chip to process the radio frequency signal received by the receiving antenna, it is usually necessary to amplify the radio frequency signal received by the receiving antenna so that the signal strength of the amplified radio frequency signal is within the range of signal strength that the GNSS chip can process, and then use the GNSS chip to process the amplified radio frequency signal.

[0057] Commonly used GNSS antennas include active antennas and passive antennas. Active antennas include a signal amplification unit, which amplifies the signal received by the active antenna. This ensures that the signal strength of the amplified signal is within the signal strength range that the GNSS chip can process. Therefore, the GNSS system connected to the active antenna does not include a signal amplification unit. This is to avoid the signal received by the active antenna passing through both the signal amplification unit in the active antenna and the signal amplification unit in the GNSS system. Otherwise, the signal strength of the signal after two amplifications would exceed the signal strength range that the GNSS chip can process, leading to reduced efficiency or inability to process the RF signal.

[0058] Passive antennas do not include a signal amplification unit. The signal strength of the signal received by the passive antenna is less than the signal strength range that the GNSS chip can process. Therefore, the GNSS system connected to the passive antenna includes a signal amplification unit. The signal amplification unit in the GNSS system amplifies the signal received by the passive antenna, so that the signal strength of the amplified signal is within the signal strength range that the GNSS chip can process.

[0059] When the GNSS antenna connected to the GNSS system is an active antenna, the GNSS system connected to that antenna does not include a signal amplification unit. When the GNSS antenna connected to the GNSS system is a passive antenna, the GNSS system connected to that antenna includes a signal amplification unit. As can be seen from the above steps, using different GNSS antennas requires using different GNSS systems, thus increasing the maintenance cost of maintaining different GNSS systems.

[0060] Please see Figure 1 , Figure 1This is a schematic diagram of a GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, and a GNSS chip 300. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving terminal 101 and an output terminal 102. The attenuation unit 200 includes an input terminal 201 and an output terminal 202. The GNSS chip 300 includes a first input terminal 301. The signal receiving terminal 101 of the signal amplification unit 100 is connected to the first terminal 401 of the GNSS antenna 400. The output terminal 102 of the signal amplification unit 100 is connected to the input terminal 201 of the attenuation unit 200. The output terminal 202 of the attenuation unit 200 is connected to the first input terminal 301 of the GNSS chip 300.

[0061] It should be understood that the signal received by the GNSS antenna 400 is a radio frequency signal, and the first signal received by the signal receiving end 101 of the signal amplification unit 100 is a radio frequency signal.

[0062] The signal amplification unit 100 is used to amplify the signal strength of the radio frequency signal passing through the signal amplification unit 100. For example, if the signal strength of the radio frequency signal received by the signal receiving end 101 of the signal amplification unit 100 is 10dB, the signal amplification unit 100 can amplify the signal strength of the radio frequency signal passing through the signal amplification unit 100 by 20dB. The signal strength of the aforementioned radio frequency signal after passing through the signal amplification unit 100 is 30dB.

[0063] The attenuation unit 200 is used to reduce the signal strength of the radio frequency (RF) signal after passing through the attenuation unit 200. For example, if the signal strength of the RF signal received at the input terminal 201 of the attenuation unit 200 is 30 dB, the attenuation unit 200 can reduce the signal strength of the RF signal after passing through the attenuation unit 200 by 20 dB. The signal strength of the RF signal after passing through the attenuation unit 200 is 10 dB.

[0064] The GNSS chip 300 is used to analyze the radio frequency (RF) signal received at its first input terminal 301. The GNSS chip 300 can only analyze RF signals with signal strengths within its processable range. For example, the processable signal strength range of the GNSS chip 300 is [20dB, 40dB]. If the RF signal received by the GNSS chip 300 has a signal strength of 10dB, this signal is less than the processable range, and the GNSS chip 300 cannot analyze it. As another example, if the processable signal strength range of the GNSS chip 300 is [20dB, 40dB], and the RF signal received by the GNSS chip 300 has a signal strength of 60dB, this signal is greater than the processable range, and the GNSS chip 300 cannot analyze it. Again, as another example, the processable signal strength range of the GNSS chip 300 is [20dB, 40dB]. When the signal strength of the radio frequency signal received by the GNSS chip 300 is 30dB, the radio frequency signal is within the signal strength range that the GNSS chip 300 can process, and the GNSS chip 300 analyzes the radio frequency signal.

[0065] When the signal receiving end 101 of the signal amplification unit 100 receives the first signal from the first end 401 of the GNSS antenna 400, the first signal is processed by the signal amplification unit 100 and the attenuation unit 200 to obtain the second signal. The signal strength of the second signal is within the signal strength range that the GNSS chip 300 can process. For example, the signal strength range that the GNSS chip 300 can process is [10dB, 40dB]. The GNSS antenna 400 connected to the GNSS system is a passive antenna. The signal strength of the first signal transmitted from the passive antenna to the signal receiving end 101 of the signal amplification unit 100 is 2dB. The signal amplification unit 100 can amplify the signal strength by 30dB, and the attenuation unit 200 can attenuate the signal strength by 15dB. Therefore, the signal strength of the second signal obtained after processing by the signal amplification unit 100 and the attenuation unit 200 is 17dB, and the signal strength of the second signal is within [10dB, 40dB].

[0066] For example, the GNSS chip 300 can process signal strengths in the range of [10dB, 40dB]. The GNSS antenna 400 connected to the GNSS system is an active antenna. The signal strength of the first signal transmitted from the active antenna to the signal receiving end 101 of the signal amplification unit 100 is 20dB. The signal amplification unit 100 can amplify the signal strength by 30dB, and the attenuation unit 200 can attenuate the signal strength by 15dB. Therefore, the signal strength of the second signal obtained after processing by the signal amplification unit 100 and the attenuation unit 200 is 35dB. The signal strength of the second signal is within the range of [10dB, 40dB].

[0067] In one possible implementation, the signal amplification unit 100 is a low noise amplifier (LNA).

[0068] In another possible implementation, the signal amplification unit 100 is an operational amplifier.

[0069] In one possible implementation, the attenuation unit 200 is a T-type attenuation circuit. See also... Figure 2 , Figure 2 This is a schematic diagram of another GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, and a GNSS chip 300. The attenuation unit 200 includes a first resistor R1, a second resistor R2, and a third resistor R3. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving terminal 101 and an output terminal 102. The GNSS chip 300 includes a second input terminal 302. The signal receiving terminal 101 of the signal amplification unit 100 is connected to the first terminal 401 of the GNSS antenna 400. The output terminal 102 of the signal amplification unit 100 is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to one end of the second resistor R2 and one end of the third resistor R3. The other end of the second resistor R2 is grounded, and the other end of the third resistor R3 is connected to the second input terminal 302 of the GNSS chip 300.

[0070] In another possible implementation, the attenuation unit 200 is a PI-type attenuation circuit. See also... Figure 3 , Figure 3This is a schematic diagram of another GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, and a GNSS chip 300. The attenuation unit 200 includes a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving terminal 101 and an output terminal 102. The GNSS chip 300 includes a third input terminal 303. The signal receiving terminal 101 of the signal amplification unit 100 is connected to the first terminal 401 of the GNSS antenna 400. The output terminal 102 of the signal amplification unit 100 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5. The other end of the fourth resistor R4 is grounded. The other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the third input terminal 303 of the GNSS chip 300. The other end of the sixth resistor R6 is grounded.

[0071] In this embodiment, when the signal receiving end 101 of the signal amplification unit 100 in the GNSS system receives a first signal from the GNSS antenna 400, it processes the first signal using the signal amplification unit 100 and the attenuation unit 200 to obtain a second signal. The signal strength of this second signal is within the signal strength range that the GNSS chip 300 can process. Through the above steps, it can be seen that when the GNSS system is connected to different types of GNSS antennas 400, the signals received by the GNSS chip 300 are all within the signal strength range that the GNSS chip 300 can process. This avoids the need to select different GNSS systems when using different types of antennas, thus reducing the maintenance cost of the GNSS system.

[0072] Please see Figure 4 , Figure 4 This is a schematic diagram of another GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, a GNSS chip 300, a first power supply unit 500, a first switching unit 600, and a first DC blocking unit 700. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving terminal 101 and an output terminal 102. The attenuation unit 200 includes an input terminal 201 and an output terminal 202. The GNSS chip 300 includes a first input terminal 301. The first power supply unit 500 includes a power supply terminal 501. The first switching unit 600 includes a first terminal 601, a second terminal 602, and a third terminal 603. The first DC blocking unit 700 includes a first terminal 701 and a second terminal 702.

[0073] The first end 401 of the GNSS antenna 400 is connected to the first end 601 of the first switching unit 600. The second end 602 of the first switching unit 600 is connected to the second end 702 of the first DC blocking unit 700, the signal receiving end 101 of the signal amplification unit 100, and the power supply end 501 of the first power supply unit 500. The third end 603 of the first switching unit 600 is connected to the first end 701 of the first DC blocking unit 700. The output end 102 of the signal amplification unit 100 is connected to the input end 201 of the attenuation unit 200. The output end 202 of the attenuation unit 200 is connected to the first input end 301 of the GNSS chip 300.

[0074] It should be understood that an active antenna includes a module with signal amplification capabilities, and this module requires power to perform the signal amplification function. When the GNSS antenna 400 is an active antenna, it requires power from the first power supply unit 500. A passive antenna does not include a module with signal amplification capabilities. When the GNSS antenna 400 is a passive antenna, it does not require power from the first power supply unit 500.

[0075] The first DC blocking unit 700 is used to block the DC signal output by the first power supply unit 500. When the first terminal 601 of the first switching unit 600 is connected to the third terminal 603 of the first switching unit 600, and the first terminal 601 of the first switching unit 600 is disconnected from the second terminal 602 of the first switching unit 600, the DC signal output by the first power supply unit 500 passes through the first DC blocking unit 700, thereby preventing it from supplying power to the GNSS antenna 400.

[0076] Therefore, when the GNSS antenna is a passive antenna and the passive antenna does not contain a second DC blocking unit, the first end 601 of the first switching unit 600 is connected to the third end 603 of the first switching unit 600, and the first end 601 of the first switching unit 600 is disconnected from the second end 602 of the first switching unit 600. The second DC blocking unit is used to block the DC signal output by the first power supply unit 500.

[0077] When the GNSS antenna 400 is a passive antenna and includes a second DC blocking unit, the first terminal 601 of the first switching unit 600 is connected to the second terminal 602 of the first switching unit 600, and the first terminal 601 of the first switching unit 600 is disconnected from the third terminal 603 of the first switching unit 600. Since the second DC blocking unit in the GNSS antenna 400 can block the DC signal output by the first power supply unit 500, preventing the first power supply unit 500 from supplying power to the GNSS antenna 400, it is not necessary to use the first DC blocking unit 700 to block the DC signal output by the first power supply unit 500. Therefore, it is not necessary to connect the first terminal 601 and the third terminal 603 of the first switching unit 600.

[0078] When the GNSS antenna 400 is an active antenna, the first terminal 601 of the first switching unit 600 is connected to the second terminal 602 of the first switching unit 600, and the first terminal 601 of the first switching unit 600 is disconnected from the third terminal 603 of the first switching unit 600. The first power supply unit 500 supplies power to the GNSS antenna 400.

[0079] Optionally, the first switching unit 600 is a switch capable of transmitting radio frequency signals.

[0080] Alternatively, the first switching unit 600 may be a radio frequency switch.

[0081] Please see Figure 5 , Figure 5 This is a schematic diagram of another GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, a GNSS chip 300, a first power supply unit 500, a first switching unit 600, a first DC blocking unit 700, and a control unit 800. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving terminal 101 and an output terminal 102. The attenuation unit 200 includes an input terminal 201 and an output terminal 202. The GNSS chip 300 includes a first input terminal 301. The first power supply unit 500 includes a power supply terminal 501. The first switching unit 600 includes a first terminal 601, a second terminal 602, a third terminal 603, and a fourth terminal 604. The first DC blocking unit 700 includes a first terminal 701 and a second terminal 702. The control unit 800 includes an output terminal 801.

[0082] The first end 401 of the GNSS antenna 400 is connected to the first end 601 of the first switching unit 600. The second end 602 of the first switching unit 600 is connected to the second end 702 of the first DC blocking unit 700, the signal receiving end 101 of the signal amplification unit 100, and the power supply end 501 of the first power supply unit 500. The third end 603 of the first switching unit 600 is connected to the first end 701 of the first DC blocking unit 700. The output end 102 of the signal amplification unit 100 is connected to the input end 201 of the attenuation unit 200. The output end 202 of the attenuation unit 200 is connected to the first input end 301 of the GNSS chip 300. The output end 801 of the control unit 800 is connected to the fourth end 604 of the first switching unit 600.

[0083] The control unit 800 is used to control the state of the first switching unit 600. When the first switching unit 600 is in a first state, its first terminal 601 is connected to its second terminal 602, and its first terminal 601 is disconnected from its third terminal 603. When the first switching unit 600 is in a second state, its first terminal 601 is connected to its third terminal 603, and its first terminal 601 is disconnected from its second terminal 602.

[0084] Optionally, the control unit 800 controls the state of the first switching unit 600 by sending control commands to the first switching unit 600. Specifically, the control unit 800 sends first control information to the first switching unit 600 to control the first switching unit 600 to be in a first state. The control unit 800 sends second control information to the first switching unit 600 to control the first switching unit 600 to be in a second state.

[0085] Optionally, the GNSS system also includes resistor R7; please refer to [link / reference]. Figure 6 , Figure 6This is a schematic diagram of another GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, a GNSS chip 300, a first power supply unit 500, a first switching unit 600, a first DC blocking unit 700, a control unit 800, and a resistor R7. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving terminal 101 and an output terminal 102. The attenuation unit 200 includes an input terminal 201 and an output terminal 202. The GNSS chip 300 includes a first input terminal 301. The first power supply unit 500 includes a power supply terminal 501. The first switching unit 600 includes a first terminal 601, a second terminal 602, a third terminal 603, and a fourth terminal 604. The first DC blocking unit 700 includes a first terminal 701 and a second terminal 702. The control unit 800 includes an output terminal 801, a first input terminal 802, and a second input terminal 803.

[0086] The first terminal 401 of the GNSS antenna 400 is connected to one end of the resistor R7 and the first input terminal 802 of the control unit 800. The other end of the resistor R7 is connected to the first terminal 601 of the first switching unit 600 and the second input terminal 803 of the control unit 800. The second terminal 602 of the first switching unit 600 is connected to the second terminal 702 of the first DC blocking unit 700, the signal receiving terminal 101 of the signal amplification unit 100, and the power supply terminal 501 of the first power supply unit 500. The third terminal 603 of the first switching unit 600 is connected to the first terminal 701 of the first DC blocking unit 700. The output terminal 102 of the signal amplification unit 100 is connected to the input terminal 201 of the attenuation unit 200. The output terminal 202 of the attenuation unit 200 is connected to the first input terminal 301 of the GNSS chip 300. The output terminal 801 of the control unit 800 is connected to the fourth terminal 604 of the first switching unit 600.

[0087] The control unit 800 acquires the voltage across the detection resistor R7 and determines the first current flowing through the resistor R7 based on the voltage difference across the resistor R7 and the resistance value of the resistor R7.

[0088] When the GNSS antenna 400 connected to the GNSS system is an active antenna, the first current is relatively small. When the first current is less than or equal to the first threshold, the control unit 800 sends a first control command to the first switching unit 600 to put the first switching unit 600 into a first state.

[0089] When the GNSS antenna 400 connected to the GNSS system is a passive antenna and contains a second DC blocking element, the first current is relatively small. When the first current is less than or equal to the first threshold, the control unit 800 sends a first control command to the first switching unit 600 to put the first switching unit 600 into a first state.

[0090] When the GNSS antenna 400 connected to the GNSS system is a passive antenna and does not contain a second DC blocking element, a short circuit to ground occurs due to the absence of a second DC blocking element, resulting in a large first current. When the first current exceeds a first threshold, the control unit 800 sends a second control command to the first switching unit 600 to put the first switching unit 600 into a second state.

[0091] Optionally, the first control command is a low-level signal, and the second control command is a high-level signal.

[0092] Please see Figure 7 , Figure 7 This is a schematic diagram of another GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, a GNSS chip 300, a second switching unit 900, a third DC blocking unit 1000, a fourth DC blocking unit 1100, and a second power supply unit 1200. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving terminal 101 and an output terminal 102. The attenuation unit 200 includes an input terminal 201 and an output terminal 202. The GNSS chip 300 includes a first input terminal 301. The second power supply unit 1200 includes a power supply terminal 1201. The second switching unit 900 includes a first terminal 901, a second terminal 902, and a third terminal 903. The third DC blocking unit 1000 includes a first terminal 1001 and a second terminal 1002. The fourth DC blocking unit includes a first terminal 1101 and a second terminal 1102.

[0093] The first end 401 of the GNSS antenna 400 is connected to the first end 901 of the second switching unit 900. The second end 902 of the second switching unit 900 is connected to the second end 1102 of the fourth DC blocking unit 1100, the first end 1001 of the third DC blocking unit 1000, and the signal receiving end 101 of the signal amplification unit 100. The third end 903 of the second switching unit 900 is connected to the first end 1101 of the fourth DC blocking unit 1100. The second end 1002 of the third DC blocking unit 1000 is connected to the power supply end 1201 of the second power supply unit 1200. The output end 102 of the signal amplification unit 100 is connected to the input end 201 of the attenuation unit 200. The output end 202 of the attenuation unit 200 is connected to the first input end 301 of the GNSS chip 300.

[0094] The fourth DC blocking unit 1100 is used to block the DC signal output by the second power supply unit 1200. When the first terminal 901 of the second switch unit 900 is connected to the third terminal 903 of the second switch unit 900, and the first terminal 901 of the second switch unit 900 is disconnected from the second terminal 902 of the second switch unit 900, the DC signal output by the second power supply unit 1200 passes through the fourth DC blocking unit 1100, thereby preventing it from supplying power to the GNSS antenna 400.

[0095] Therefore, when the GNSS antenna 400 is a passive antenna and does not contain a second DC blocking unit, the first end 901 of the second switching unit 900 is connected to the third end 903 of the second switching unit 900, and the first end 901 of the second switching unit 900 is disconnected from the second end 902 of the second switching unit 900. The second DC blocking unit is used to block the DC signal output by the second power supply unit 1200.

[0096] When the GNSS antenna 400 is a passive antenna and includes a second DC blocking unit, the first terminal 901 of the second switching unit 900 is connected to the second terminal 902 of the second switching unit 900, and the first terminal 901 of the second switching unit 900 is disconnected from the third terminal 903 of the second switching unit 900. Since the second DC blocking unit in the GNSS antenna 400 can block the DC signal output by the first power supply unit 500, preventing the second power supply unit 1200 from supplying power to the GNSS antenna 400, it is not necessary to use the fourth DC blocking unit 1100 to block the DC signal output by the second power supply unit 1200. Therefore, it is not necessary to connect the first terminal 901 and the third terminal 903 of the second switching unit 900.

[0097] When the GNSS antenna 400 is an active antenna, the first terminal 901 of the second switching unit 900 is connected to the second terminal 902 of the second switching unit 900, and the first terminal 901 of the second switching unit 900 is disconnected from the third terminal 903 of the second switching unit 900. The second power supply unit 1200 supplies power to the GNSS antenna 400.

[0098] The third DC blocking unit 1000 is used to block the first signal from the GNSS antenna 400, which is an AC signal. By blocking the first signal, the power supply terminal 1201 of the second power supply unit 1200 is prevented from receiving the first signal, thus avoiding a degradation in the performance of the second power supply unit 1200.

[0099] Please see Figure 8 , Figure 8This is a schematic diagram of another GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, a GNSS chip 300, a third switching unit 1300, a third power supply unit 1400, a fifth DC blocking unit 1500, and a sixth DC blocking unit 1600. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving terminal 101 and an output terminal 102. The attenuation unit 200 includes an input terminal 201 and an output terminal 202. The GNSS chip 300 includes a first input terminal 301. The third switching unit 1300 includes a first terminal 1301, a second terminal 1302, and a third terminal 1303. The third power supply unit 1400 includes a power supply terminal 1401. The fifth DC blocking unit 1500 includes a first terminal 1501 and a second terminal 1502. The sixth DC blocking unit 1600 includes a first terminal 1601 and a second terminal 1602.

[0100] The first end 401 of the GNSS antenna 400 is connected to the first end 1301 of the third switching unit 1300. The second end 1302 of the third switching unit 1300 is connected to the second end 1502 of the fifth DC blocking unit 1500, the first end 1601 of the sixth DC blocking unit 1600, and the power supply end 1401 of the third power supply unit 1400. The third end 1303 of the third switching unit 1300 is connected to the first end 1501 of the fifth DC blocking unit 1500. The second end 1602 of the sixth DC blocking unit 1600 is connected to the signal receiving end 101 of the signal amplification unit 100. The output end 102 of the signal amplification unit 100 is connected to the input end 201 of the attenuation unit 200. The output end 202 of the attenuation unit 200 is connected to the first input end 301 of the GNSS chip 300.

[0101] The fifth DC blocking unit 1500 is used to block the DC signal output by the third power supply unit 1400. When the first terminal 1301 of the third switching unit 1300 is connected to the third terminal 1303 of the third switching unit 1300, and the first terminal 1301 of the third switching unit 1300 is disconnected from the second terminal 1302 of the third switching unit 1300, the DC signal output by the third power supply unit 1400 passes through the fifth DC blocking unit 1500, thereby preventing it from supplying power to the GNSS antenna 400.

[0102] Therefore, when the GNSS antenna 400 is a passive antenna and does not contain a second DC blocking unit, the first terminal 1301 of the third switching unit 1300 is connected to the third terminal 1303 of the third switching unit 1300, and the first terminal 1301 of the third switching unit 1300 is disconnected from the second terminal 1302 of the third switching unit 1300. The second DC blocking unit is used to block the DC signal output by the third power supply unit 1400.

[0103] When the GNSS antenna 400 is a passive antenna and includes a second DC blocking unit, the first terminal 1301 of the third switching unit 1300 is connected to the second terminal 1302 of the third switching unit 1300, and the first terminal 1301 of the third switching unit 1300 is disconnected from the third terminal 1303 of the third switching unit 1300. Since the second DC blocking unit in the GNSS antenna 400 can block the DC signal output by the first power supply unit 500, preventing the third power supply unit 1400 from supplying power to the GNSS antenna 400, it is not necessary to use the fifth DC blocking unit 1500 to block the DC signal output by the third power supply unit 1400. Therefore, it is not necessary to connect the first terminal 1301 and the third terminal 1303 of the third switching unit 1300.

[0104] When the GNSS antenna 400 is an active antenna, the first terminal 1301 of the third switching unit 1300 is connected to the second terminal 1302 of the third switching unit 1300, and the first terminal 1301 of the third switching unit 1300 is disconnected from the third terminal 1303 of the third switching unit 1300. The third power supply unit 1400 supplies power to the GNSS antenna 400.

[0105] The sixth DC blocking unit 1600 is used to block the DC signal output by the third power supply unit 1400, so as to prevent the GNSS chip 300 from receiving the DC signal output by the third power supply unit 1400 and thus avoid affecting the performance of the GNSS chip 300 in resolving the radio frequency signal from the GNSS antenna.

[0106] based on Figure 6 The provided GNSS system, in this application embodiment, provides another GNSS system, please refer to [link to relevant documentation]. Figure 9 , Figure 9This is a schematic diagram of another GNSS system provided in an embodiment of this application. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, a GNSS chip 300, a first power supply unit 500, a first switching unit 600, a first DC blocking unit 700, a control unit 800, a resistor R7, a seventh DC blocking unit 1700, and an eighth DC blocking unit 1800. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401. The signal amplification unit 100 includes a signal receiving end 101 and an output end 102; the attenuation unit 200 includes an input end 201 and an output end 202; the GNSS chip 300 includes a first input end 301; the first power supply unit 500 includes a power supply end 501; the first switching unit 600 includes a first terminal 601, a second terminal 602, a third terminal 603, and a fourth terminal 604; the first DC blocking unit 700 includes a first terminal 701 and a second terminal 702; the control unit 800 includes an output end 801, a first input end 802, and a second input end 803; the seventh DC blocking unit 1700 includes a first terminal 1701 and a second terminal 1702; and the eighth DC blocking unit 1800 includes a first terminal 1801 and a second terminal 1802.

[0107] The first terminal 401 of the GNSS antenna 400 is connected to one end of the resistor R7 and the first input terminal 802 of the control unit 800. The other end of the resistor R7 is connected to the first terminal 601 of the first switching unit 600 and the second input terminal 803 of the control unit 800. The second terminal 602 of the first switching unit 600 is connected to the second terminal 702 of the first DC blocking unit 700, the first terminal 1801 of the eighth DC blocking unit 1800, and the first terminal 1701 of the seventh DC blocking unit 1700. The third terminal 603 of the first switching unit 600 is connected to the first DC blocking unit 700. The first terminal 701 is connected, the second terminal 1702 of the seventh DC blocking unit 1700 is connected to the power supply terminal 501 of the first power supply unit 500, the second terminal 1802 of the eighth DC blocking unit 1800 is connected to the signal receiving terminal 101 of the signal amplification unit 100, the output terminal 102 of the signal amplification unit 100 is connected to the input terminal 201 of the attenuation unit 200, the output terminal 202 of the attenuation unit 202 is connected to the first input terminal 301 of the GNSS chip 300, and the output terminal 801 of the control unit 800 is connected to the fourth terminal 604 of the first switching unit 600.

[0108] The seventh DC blocking unit 1700 is used to block the first signal from the GNSS antenna 400, which is an AC signal. By blocking the first signal, the power supply terminal 501 of the first power supply unit 500 is prevented from receiving the first signal, thus avoiding a degradation in the performance of the first power supply unit 500.

[0109] The eighth DC blocking unit 1800 is used to block the DC signal output by the first power supply unit 500, so as to prevent the GNSS chip 300 from receiving the DC signal output by the first power supply unit 500 and thus avoid affecting the performance of the GNSS chip 300 in resolving the radio frequency signal from the GNSS antenna.

[0110] based on Figure 9 For the provided GNSS system, please refer to [link / reference]. Figure 10 , Figure 10 This application provides a circuit diagram of a GNSS system according to an embodiment. The GNSS system includes a signal amplification unit 100, an attenuation unit 200, a GNSS chip 300, a first power supply unit 500, a first switching unit 600, a first DC blocking unit 700, a control unit 800, resistors R7 and R8, a seventh DC blocking unit 1700, an eighth DC blocking unit 1800, a first anti-static circuit 1900, a first radio frequency matching circuit 2000, a first filter circuit 2100, a second radio frequency matching circuit 2200, a third radio frequency matching circuit 2300, a second filter circuit 2400, and a fourth radio frequency matching circuit 2500. The GNSS system is connected to a GNSS antenna 400, which includes a first terminal 401.

[0111] The signal amplification unit 100 includes a signal receiving terminal 101, an output terminal 102, an enable terminal 103, a power supply terminal 104, a ground terminal 105, and a ground terminal 106. The signal receiving terminal 101 receives radio frequency (RF) signals, the output terminal 102 outputs amplified RF signals, and the enable terminal 103 receives an activation level signal to activate the signal amplification unit 100. For example, if the level signal received by the enable terminal 103 is not an activation level signal, the signal amplification unit 100 is not activated; if the received level signal is an activation level signal, the signal amplification unit 100 is activated. Ground terminals 105 and 106 are grounded to provide a stable electrical reference potential for the signal amplification unit 100, ensuring the normal operation of the circuitry within the signal amplification unit 100. The power supply terminal 104 is connected to the first power supply, which is used to power the signal amplification unit 100. The power supply terminal 104 is also connected to one end of the capacitor C4, and the other end of the capacitor C4 is grounded. The capacitor C4 is connected in parallel with the first power supply. The capacitor C4 is used to store the redundant electrical energy released by the first power supply. When the power consumption of the signal amplification unit 100 increases, the redundant electrical energy stored in the capacitor C4 can be used to power the signal amplification unit 100.

[0112] The attenuation unit includes resistors R1, R2, and R3.

[0113] The GNSS chip 300 includes a first input terminal 301.

[0114] The first power supply unit 500 includes a power supply terminal 501.

[0115] The first switching unit 600 includes a first terminal 601, a second terminal 602, a third terminal 603, a fourth terminal 604, a power supply terminal 605, and a ground terminal 606. The ground terminal 606 is grounded to maintain the stability of the circuit in the first switching unit 600. The power supply terminal 605 is connected to a second power supply, which supplies power to the first switching unit 600.

[0116] The first DC blocking unit 700 includes a capacitor C1, which is used to block DC signals from the first power supply unit 500.

[0117] The control unit 800 includes an output terminal 801, a first input terminal 802, and a second input terminal 803.

[0118] The seventh DC blocking unit 1700 includes an inductor L1, which is used to block the first signal from the GNSS antenna 400.

[0119] The eighth DC blocking unit 1800 includes a capacitor C2, which is used to block DC signals from the first power supply unit 500.

[0120] The first RF matching circuit 2000 is located on the path formed by the eighth DC blocking unit 1800 and the first filter circuit 2100 to reduce the transmission loss of the RF signal in the aforementioned path and improve the integrity of the RF signal transmission in the aforementioned path. The first RF matching circuit 2000 includes an inductor L2 and a capacitor C3.

[0121] The first filter circuit 2100 is used to filter signals within the frequency band of the radio frequency signals that the GNSS chip 300 can process. The first filter circuit 2100 includes an input terminal 2101, an output terminal 2102, a ground terminal 2103, a ground terminal 2104, and a ground terminal 2105. The input terminal 2101 is used to receive radio frequency signals, the output terminal 2102 is used to output the filtered radio frequency signals, and the ground terminals 2103, 2104, and 2105 are grounded to reduce noise and interference in the first filter circuit 2100 and improve its filtering effect.

[0122] The second RF matching circuit 2200 is located on the path formed by the eighth DC blocking unit 1800 and the signal amplification unit 100, in order to reduce the transmission loss of the RF signal in the aforementioned path and improve the integrity of the RF signal transmission in the aforementioned path. The second RF matching circuit 2200 includes an inductor L3 and a capacitor C4.

[0123] The third RF matching circuit 2300 is located on the path formed by the signal amplification unit 100 and the second filter circuit 2400 to reduce the transmission loss of the RF signal in the aforementioned path and improve the integrity of the RF signal transmission in the aforementioned path. The third RF matching circuit 2300 includes capacitors C5 and C6.

[0124] The second filter circuit 2400 is used to filter signals within the frequency band of the radio frequency signals that the GNSS chip 300 can process. The second filter circuit 2400 includes an input terminal 2401, an output terminal 2402, a ground terminal 2403, a ground terminal 2404, and a ground terminal 2405. The input terminal 2401 receives the radio frequency signal, the output terminal 2402 outputs the filtered radio frequency signal, and the ground terminals 2403, 2404, and 2405 are grounded to reduce noise and interference in the second filter circuit 2400 and improve its filtering effect.

[0125] The fourth RF matching circuit 2500 is located on the path formed by the attenuation unit 200 and the GNSS chip 300 to reduce the transmission loss of the RF signal in the aforementioned path and improve the integrity of the RF signal transmission in the aforementioned path. The fourth RF matching circuit 2500 includes a capacitor C7 and an inductor L4.

[0126] Resistor R8 is used to limit the current transmitted to GNSS antenna 400 to prevent damage to GNSS antenna 400 due to excessive current.

[0127] The first terminal 401 of the GNSS antenna 400 is connected to one end of resistor R7 and the first input terminal 802 of the control unit 800. The other end of resistor R7 is connected to the second input terminal 803 of the control unit 800 and the first terminal 601 of the first switching unit 600. The fourth terminal 604 of the first switching unit 600 is connected to the output terminal 801 of the control unit 800. The third terminal 603 of the first switching unit 600 is connected to one end of capacitor C1. The second terminal 602 of the first switching unit 600 is connected to the other end of capacitor C1, one end of capacitor C2, one end of the first anti-static circuit 1900, and one end of inductor L1. The other end of inductor L1 is connected to one end of resistor R8. The other end of resistor R8 is connected to the power supply terminal 501 of the first power supply unit 500. The other end of capacitor C2 is connected to one end of inductor L2 and one end of capacitor C3. The other end of inductor L2 is grounded. The other end of capacitor C3 is connected to the first filter circuit. The input terminal 2101 of circuit 2100 is connected, the output terminal 2102 of the first filter circuit 2100 is connected to one end of capacitor C4 and one end of inductor L3 respectively, the other end of capacitor C4 is grounded, the other end of inductor L3 is connected to the signal receiving terminal 101 of signal amplification unit 100, the output terminal 102 of signal amplification unit 100 is connected to one end of capacitor C5, the other end of capacitor C5 is connected to one end of capacitor C6 and the input terminal 2401 of second filter circuit 2400 respectively, the other end of capacitor C6 is grounded, the output terminal 2402 of second filter circuit 2400 is connected to one end of resistor R1, the other end of resistor R1 is connected to one end of resistor R2 and one end of resistor R3 respectively, the other end of resistor R2 is grounded, the other end of resistor R3 is connected to one end of capacitor C7 and one end of inductor L4 respectively, the other end of capacitor C7 is grounded, and the other end of inductor L4 is connected to the first input terminal 301 of GNSS chip 300.

[0128] Please see Figure 11 , Figure 11This application provides a flowchart of an implementation of a GNSS system. First, the GNSS chip in the GNSS system is identified to determine the signal strength range that the GNSS chip can handle. Then, the attenuation value of the attenuation circuit is adjusted to ensure that the second signal obtained after processing by the signal amplification unit and attenuation unit is within the signal strength range that the GNSS chip can handle. Next, antenna compatibility is tested to ensure that the GNSS system can be connected to either an active antenna or a passive antenna. After confirming the above steps are correct, the first power supply unit in the GNSS system is powered on, the GNSS antenna is connected, and the voltage across resistor R7 is read. The first current passing through resistor R7 is calculated to determine the antenna type of the connected GNSS antenna. If the first current is less than or equal to a first threshold, the GNSS antenna is either an active antenna or a passive antenna including a second DC blocking unit. The first terminal of the first switching unit is connected to the second terminal of the first switching unit, and the first terminal of the first switching unit is disconnected from the third terminal of the first switching unit. When the first current exceeds the first threshold, the GNSS antenna is a passive antenna excluding the second DC blocking unit. The first terminal of the first switching unit is connected to the third terminal of the first switching unit, and the first terminal of the first switching unit is disconnected from the second terminal of the first switching unit. The signal received by the GNSS antenna passes through the first DC blocking unit. After the above steps, the GNSS antenna transmits the first signal to the GNSS chip and terminates the execution of the GNSS system.

[0129] In one possible implementation, the communication device provided in this application embodiment includes the above-described GNSS system and GNSS antenna, and its functions or included modules can be used to execute the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0130] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a particular embodiment can be found in the relevant descriptions of other embodiments. It should be understood that the disclosed apparatus can be implemented in other ways based on the embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative.

[0131] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A GNSS system, characterized in that, The GNSS system is used to connect with a GNSS antenna to transmit signals received by the GNSS antenna to a GNSS chip in the GNSS system. The GNSS system includes: Attenuation unit, signal amplification unit, and the GNSS chip; The output terminal of the signal amplification unit is connected to the input terminal of the attenuation unit, and the output terminal of the attenuation unit is connected to the first input terminal of the GNSS chip. When the signal receiving end of the signal amplification unit receives a first signal from the GNSS antenna, the first signal is processed by the signal amplification unit and the attenuation unit to obtain a second signal, and the signal strength of the second signal is within the signal strength range that the GNSS chip can process.

2. The GNSS system according to claim 1, characterized in that, The GNSS system also includes: The first power supply unit, the first switching unit, and the first DC blocking unit; The first end of the first switching unit is connected to the first end of the GNSS antenna, the second end of the first switching unit is connected to the first power supply end of the first power supply unit, the second end of the first DC blocking unit, and the signal receiving end of the signal amplification unit, and the third end of the first switching unit is connected to the first end of the first DC blocking unit. When the GNSS antenna is an active antenna, the first end of the first switching unit is connected to the second end of the first switching unit, and the first end of the first switching unit is disconnected from the third end of the first switching unit. When the GNSS antenna is a passive antenna and the passive antenna includes a second DC blocking unit, the first end of the first switching unit is connected to the second end of the first switching unit, and the first end of the first switching unit is disconnected from the third end of the first switching unit. The second DC blocking unit is used to block the DC signal output by the first power supply unit. When the GNSS antenna is a passive antenna and the passive antenna does not include the second DC blocking unit, the first end of the first switching unit is connected to the third end of the first switching unit, and the first end of the first switching unit is disconnected from the second end of the first switching unit. The first DC blocking unit is used to block the DC signal output by the first power supply unit.

3. The GNSS system according to claim 1, characterized in that, The GNSS system also includes: Second power supply unit, second switching unit, third DC blocking unit, fourth DC blocking unit; The first end of the second switching unit is connected to the first end of the GNSS antenna, the second end of the second switching unit is connected to the second end of the fourth DC blocking unit, the first end of the third DC blocking unit, and the signal receiving end of the signal amplification unit, the third end of the second switching unit is connected to the first end of the fourth DC blocking unit, and the second end of the third DC blocking unit is connected to the power supply end of the second power supply unit. When the GNSS antenna is an active antenna, the first end of the second switching unit is connected to the second end of the second switching unit, and the first end of the second switching unit is disconnected from the third end of the second switching unit. The third DC blocking unit is used to block the first signal from the GNSS antenna. When the GNSS antenna is a passive antenna and the passive antenna includes a second DC blocking unit, the first end of the second switching unit is connected to the second end of the second switching unit, and the first end of the second switching unit is disconnected from the third end of the second switching unit. The second DC blocking unit is used to block the DC signal output by the second power supply unit. When the GNSS antenna is a passive antenna and the passive antenna does not include the second DC blocking unit, the first end of the second switching unit is connected to the third end of the second switching unit, and the first end of the second switching unit is disconnected from the second end of the second switching unit. The fourth DC blocking unit is used to block the DC signal output by the second power supply unit.

4. The GNSS system according to claim 1, characterized in that, The GNSS system also includes: The third switching unit, the third power supply unit, the fifth DC blocking unit, and the sixth DC blocking unit; The first end of the GNSS antenna is connected to the first end of the third switching unit. The second end of the third switching unit is connected to the second end of the fifth DC blocking unit, the first end of the sixth DC blocking unit, and the power supply end of the third power supply unit. The second end of the third switching unit is connected to the first end of the fifth DC blocking unit. The second end of the sixth DC blocking unit is connected to the signal receiving end of the signal amplification unit. When the GNSS antenna is an active antenna, the first end of the third switching unit is connected to the second end of the third switching unit, and the first end of the third switching unit is disconnected from the third end of the third switching unit. The sixth DC blocking unit is used to block the DC signal from the third power supply unit. When the GNSS antenna is a passive antenna and the passive antenna includes a second DC blocking unit, the first end of the third switching unit is connected to the second end of the third switching unit, and the first end of the third switching unit is disconnected from the third end of the third switching unit. The second DC blocking unit is used to block the DC signal output by the third power supply unit. When the GNSS antenna is a passive antenna and the passive antenna does not include the second DC blocking unit, the first end of the third switching unit is connected to the third end of the third switching unit, and the first end of the third switching unit is disconnected from the second end of the third switching unit. The fifth DC blocking unit is used to block the DC signal output by the third power supply unit.

5. The GNSS system according to claim 2, characterized in that, The GNSS system also includes: Control unit; The output terminal of the control unit is connected to the input terminal of the first switch unit. The control unit is used to control the state of the first switch unit. When the first switch unit is in a first state, the first end and the second end of the first switch unit are connected, and the first end and the third end of the first switch unit are disconnected. When the first switch unit is in a second state, the first end and the third end of the first switch unit are connected, and the first end and the second end of the first switch unit are disconnected.

6. The GNSS system according to claim 1, characterized in that, The attenuation unit includes: First resistor, second resistor, third resistor; The first end of the first resistor is connected to the output end of the signal amplification unit, the second end of the first resistor is connected to the first end of the second resistor and the first end of the third resistor, the second end of the second resistor is grounded, and the second end of the third resistor is connected to the second input end of the GNSS chip.

7. The GNSS system according to claim 1, characterized in that, The attenuation unit includes: Fourth resistor, fifth resistor, sixth resistor; The output terminal of the signal amplification unit is connected to the first terminal of the fourth resistor and the first terminal of the fifth resistor, respectively. The second terminal of the fifth resistor is connected to the first terminal of the sixth resistor and the third input terminal of the GNSS chip. The second terminal of the fourth resistor is grounded, and the second terminal of the sixth resistor is grounded.

8. The GNSS system according to claim 2, characterized in that, The first switching unit is a switch capable of transmitting radio frequency signals.

9. The GNSS system according to claim 2, characterized in that, The first switching unit is a radio frequency switch.

10. A communication device, characterized in that, The communication device includes a GNSS system and a GNSS antenna as described in any one of claims 1-9.

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