WO2020150857A1

WO2020150857A1 - Vehicle-mounted antenna system and communication method used for the vehicle-mounted antenna system

Info

Publication number: WO2020150857A1
Application number: PCT/CN2019/072498
Authority: WO
Inventors: 彭勇
Original assignee: 华为技术有限公司
Priority date: 2019-01-21
Filing date: 2019-01-21
Publication date: 2020-07-30
Also published as: CN112189378B; CN112189378A

Abstract

The present application provides a vehicle-mounted antenna system. A plurality of transmitting circuits are configured to a plurality of antennas, so that when a part of the antennas are damaged, the vehicle-mounted antenna system can transmit signals directly using undamaged antennas and transmitting circuits of the undamaged antennas without using DPDT to switch a transmitting circuit. Because the vehicle-mounted antenna system has at least two transmitting circuits and at least two antennas, when a main antenna is damaged and an auxiliary antenna is not damaged, the auxiliary antenna can be communicated, without switching by means of a DPDT, with a transmitting circuit to transmit signals, thus avoiding an insertion loss caused by the introducing of the DPDT. Besides, because the DPDT is a device directly connected to antennas, if the DPDT fails, the entire antenna system will not function; therefore, the avoidance of the use of a DPDT further increases the reliability of the vehicle-mounted antenna system.

Description

Vehicle-mounted antenna system and communication method applied to the vehicle-mounted antenna system

Technical field

This application relates to the field of communication, and in particular to a vehicle-mounted antenna system and a communication method applied to the vehicle-mounted antenna system.

Background technique

The vehicle-mounted antenna system is a communication system installed on the car. It includes an antenna and a transceiver circuit. When the car sends information, the electric signal is transmitted to the antenna through the transmitting circuit, and then the electric signal is converted into electromagnetic waves by the antenna and sent out; when the car receives For information, the antenna converts electromagnetic waves containing information into electrical signals and transmits them to the on-board processor through the receiving circuit.

The vehicle antenna system usually includes multiple antennas to improve the reliability of the vehicle antenna system. For example, when a car accident occurs, even if part of the antenna is damaged, the remaining antennas can also complete the transmission and reception of information, so that rescuers can perform rescue operations.

The existing vehicle antenna system uses a dual-pole dual-throw switch (DPDT) to switch between multiple antennas. When one antenna is damaged, the transmitter circuit is switched to the backup antenna through DPDT. After completing the information transmission, however, DPDT will bring insertion loss (insertion loss), resulting in a decrease in communication coverage, which cannot meet the communication safety requirements of the vehicle.

Summary of the invention

This application provides a vehicle-mounted antenna system that configures multiple transmitting circuits for multiple antennas, so that when some antennas are damaged, the vehicle-mounted antenna system can directly use the undamaged antenna and the transmission circuit of the undamaged antenna to transmit signals without Use DPDT to switch the transmitting circuit, thereby improving the communication quality when some antennas are damaged.

In the first aspect, this application provides a vehicle-mounted antenna system, including: a main antenna, an auxiliary antenna, and a multi-mode multi-band power amplifier (MMMPA). The main antenna communicates with each other through a first transmitting circuit. The MMMPA is connected, and the auxiliary antenna is connected to the MMMPA through a second transmitting circuit; the second transmitting circuit includes at least one of the following three circuits: a frequency division duplexing (FDD) transmitting circuit through which the FDD transmitting circuit passes The duplexer is connected to the auxiliary antenna, and the duplexer is also used to connect the FDD receiving circuit and the auxiliary antenna; time division duplexing (TDD) transmitting circuit, the TDD transmitting circuit passes the surface acoustic wave SAW filter and the auxiliary antenna Connection; Global system for mobile communications (GSM) transmission circuit.

Since the vehicle antenna system has at least two transmitting circuits and at least two antennas, when the main antenna is damaged but the auxiliary antenna is not damaged, the auxiliary antenna can be connected to the transmitting circuit without DPDT switching to transmit signals, which can avoid Introduce the insertion loss caused by DPDT. In addition, because DPDT is a device directly connected to the antenna, if the DPDT fails, the entire antenna system will not work. Therefore, avoiding the use of DPDT also improves the reliability of the vehicle antenna system.

In addition, the vehicle antenna system equipped with multiple transmission circuits can adapt to different communication scenarios. When one frequency band is not available, the vehicle antenna system can switch the transmission circuit and communicate through other frequency bands. Therefore, the vehicle antenna system equipped with multiple transmission circuits Has higher reliability.

In a possible design, the vehicle antenna system also includes a TDD receiving circuit; the TDD transmitting circuit includes a surface acoustic wave (SAW) filter and a single-pole dual-throw (SPDT), SPDT The common terminal is connected with the SAW filter, and the two switching terminals of the SPDT are respectively connected with the TDD transmitting circuit and the TDD receiving circuit.

The TDD transmitting circuit and the TDD receiving circuit share a SAW filter, which reduces the amount of SAW filter used and reduces the cost of the radio frequency circuit.

In the second aspect, this application provides another vehicle-mounted antenna system, including: a main antenna, an auxiliary antenna, and MMMPA, wherein the main antenna is connected to MMMPA through a first transmitting circuit; the auxiliary antenna is connected to MMMPA through a second transmitting circuit, And/or, the auxiliary antenna is connected to the GSM transmitting circuit through a front end module (FEM); the FEM includes a power amplifier (PA), and the PA is used to connect the auxiliary antenna to the GSM transmitting circuit; the second transmitting circuit It includes at least one of the following two circuits: FDD transmitting circuit, the FDD transmitting circuit is connected to the auxiliary antenna through a duplexer, and the duplexer is also used to connect the FDD receiving circuit and the auxiliary antenna; TDD transmitting circuit, the TDD transmitting The circuit is connected to the auxiliary antenna through the SAW filter.

Since the vehicle antenna system has at least two transmitting circuits and at least two antennas, when the main antenna is damaged but the auxiliary antenna is not damaged, the auxiliary antenna can be connected to the transmitting circuit without DPDT switching to transmit signals, thereby avoiding Introduce the insertion loss caused by DPDT. In addition, because DPDT is a device directly connected to the antenna, if the DPDT fails, the entire antenna system will not work. Therefore, avoiding the use of DPDT also improves the reliability of the vehicle antenna system.

In a possible design, the vehicle antenna system further includes a TDD receiving circuit and an SPDT; the common end of the SPDT is connected to the SAW filter, and the two switching ends of the SPDT are respectively connected to the TDD transmitting circuit and the TDD receiving circuit.

In a third aspect, this application provides a communication method applied to the vehicle antenna system described in the first aspect. The method includes: detecting whether the main antenna is normal; when the main antenna is abnormal, detecting whether the auxiliary antenna is normal; When the signal is transmitted through the auxiliary antenna and the second transmitting circuit.

Since the vehicle antenna system has at least two transmitting circuits and at least two antennas, when the main antenna is damaged but the auxiliary antenna is not damaged, the signal can be transmitted through the auxiliary antenna and the transmitting circuit connected to the auxiliary antenna, without switching through DPDT The transmitting circuit can avoid the insertion loss caused by the introduction of DPDT. In addition, because DPDT is a device directly connected to the antenna, if the DPDT fails, the entire antenna system will not work. Therefore, avoiding the use of DPDT also improves the reliability of the vehicle antenna system.

In a fourth aspect, the present application provides a communication method applied to the vehicle antenna system described in the second aspect. The method includes: detecting whether the main antenna is normal; when the main antenna is abnormal, detecting whether the auxiliary antenna is normal; when the auxiliary antenna is normal When the signal is transmitted through the auxiliary antenna and the second transmitting circuit.

In the fifth aspect, the present application also provides a computer-readable storage medium in which a computer program is stored. When the computer program is executed by the processor of the on-board antenna system, the processor executes the third aspect or The method described in the fourth aspect.

In the sixth aspect, the present application also provides a computer program product, the computer program product comprising: computer program code, when the computer program code is run by the processor of the vehicle antenna system, the processor executes the third aspect or the fourth aspect The method described in the aspect.

Description of the drawings

Fig. 1 is a schematic diagram of a vehicle including an antenna system provided by the present application;

Figure 2 is a schematic diagram of a vehicle-mounted antenna system suitable for the present application;

Fig. 3 is a schematic diagram of another vehicle-mounted antenna system suitable for the present application;

Fig. 4 is a schematic diagram of a vehicle-mounted antenna system provided by the present application;

Fig. 5 is a schematic diagram of another vehicle-mounted antenna system provided by the present application;

Fig. 6 is a schematic diagram of still another vehicle-mounted antenna system provided by the present application;

FIG. 7 is a schematic diagram of still another vehicle-mounted antenna system provided by this application;

Fig. 8 is a schematic diagram of yet another vehicle-mounted antenna system provided by the present application;

FIG. 9 is a schematic diagram of another vehicle-mounted antenna system provided by the present application;

FIG. 10 is a schematic diagram of still another vehicle-mounted antenna system provided by this application;

FIG. 11 is a schematic diagram of another vehicle-mounted antenna system provided by the present application;

FIG. 12 is a schematic diagram of still another vehicle-mounted antenna system provided by this application;

FIG. 13 is a schematic diagram of a communication method based on a vehicle antenna system provided by the present application.

detailed description

Fig. 1 shows a schematic diagram of a vehicle including an antenna system provided by the present application.

The vehicle shown in Fig. 1 is equipped with two antennas, antenna 1 and antenna 2, which can be used for receiving and transmitting. Among them, antenna 1 is the main antenna and antenna 2 is the auxiliary antenna. Under normal conditions, the vehicle-mounted antenna system mainly transmits and receives through antenna 1, and transmits and receives through antenna 2 to increase the transmission gain and reception gain. Therefore, the auxiliary The antenna may also be called a diversity antenna or a multiple-input multiple-output (MIMO) antenna.

The antenna system shown in FIG. 1 is only an example, and the vehicle-mounted antenna system suitable for the present application may also include more antennas. In addition, this application does not limit the shape and function of the antenna of the vehicle-mounted antenna system. For example, the antenna of the vehicle-mounted antenna system can be a one-dimensional antenna composed of metal wires or a dish antenna; for example, the antenna of the vehicle-mounted antenna system It can be a microwave antenna or a long wave antenna.

Fig. 2 is a schematic diagram of an on-board antenna system that can be applied to the vehicle shown in Fig. 1.

In the vehicle antenna system shown in Figure 2, the main antenna is connected to the main transmit/receive path (main path for TX/RX) and the receive diversity path (div path for RX) through DPDT, and the auxiliary antenna is also connected to the transmit/receive main path for RX through the DPDT. Receive main path) and receive diversity path connection.

When the main antenna is working normally, DPDT connects the main antenna and the main transmitting/receiving path, and the vehicle antenna system transmits signals through the main antenna and the main transmitting/receiving path. Among them, the other two ends of the DPDT are connected to the auxiliary antenna and the receiving diversity path to facilitate the vehicle The antenna system receives signals through the auxiliary antenna and the receive diversity path to improve the receive gain.

When the main antenna fails to work normally, DPDT switches the antenna connected to the main transmit/receive path from the main antenna to the auxiliary antenna. The vehicle antenna system transmits signals through the auxiliary antenna and the transmit/receive main path, thereby improving the reliability of the vehicle antenna system .

Fig. 3 is a schematic diagram of another vehicle-mounted antenna system that can be applied to the vehicle shown in Fig. 1.

In the vehicle antenna system shown in Figure 3, the main antenna is connected to the main transmit/receive path and MIMO path 2 (MIMO path2 for RX) through DPDT1; the auxiliary antenna 2 is connected to the main transmit/receive path and MIMO path through DPDT2 and DPDT1. 2 is connected, the auxiliary antenna 2 is connected to the receiving MIMO path 3 through DPDT2; the auxiliary antenna 3 is connected to the transmitting/receiving main path and the receiving MIMO path 2 through DPDT3, DPDT2 and DPDT1, and the auxiliary antenna 3 is also connected to the receiving MIMO path 3 through DPDT3 and DPDT2 The auxiliary antenna 3 is also connected to the receiving MIMO path 4 through DPDT3; the auxiliary antenna 4 is connected to the transmitting/receiving main path and the receiving MIMO path 2 through DPDT3, DPDT2 and DPDT1, and the auxiliary antenna 4 is also connected to the receiving MIMO path 3 through DPDT3 and DPDT2. Connected, the auxiliary antenna 4 is also connected to the receiving MIMO path 4 through the DPDT3.

When the main antenna is working normally, DPDT1 is connected to the main antenna and the main transmitting/receiving path, and the vehicle antenna system transmits signals through the main antenna and the main transmitting/receiving path; DPDT1 is also connected to DPDT2 and receiving MIMO path 2, so that the vehicle antenna system can pass through the auxiliary antenna 2Receive signals and increase the reception gain. Among them, DPDT2 is connected to the auxiliary antenna 2 and DPDT1; DPDT2 is connected to DPDT3 and the receiving MIMO path 3, so that the vehicle antenna system can receive signals through the auxiliary antenna 3 and the receiving MIMO path 3 to increase the reception gain. Among them, DPDT3 is connected to the auxiliary antenna 3 and DPDT2; DPDT3 is also connected to the auxiliary antenna 4 and the receiving MIMO path 4, so that the vehicle antenna system can receive signals through the auxiliary antenna 4 and the receiving MIMO path 4 and improve the receiving gain.

When the main antenna cannot work normally, DPDT1 connects DPDT2 with the main transmitting/receiving path, so that the auxiliary antenna 2, auxiliary antenna 3 or auxiliary antenna 4 is connected to the main transmitting/receiving path through DPDT1.

For example, when the main antenna is not working normally, and when the auxiliary antenna 2 is working normally, the vehicle antenna system can be connected to the main transmitting/receiving path through DPDT2 and DPDT1, and transmitting signals through the auxiliary antenna 2 and the main transmitting/receiving path, thereby improving Improve the reliability of the vehicle antenna system.

For another example, when the main antenna and the auxiliary antenna 2 are not working normally, and when the auxiliary antenna 3 is working normally, the vehicle antenna system can switch one end of DPDT2 from receiving MIMO path 3 to DPDT1, and switch one end of DPDT1 from receiving MIMO Path 2 is switched to the main transmitting/receiving path, thereby connecting the auxiliary antenna 3 and the main transmitting/receiving path. Then, the vehicle antenna system transmits signals through the auxiliary antenna 3 and the main transmitting/receiving path, which improves the reliability of the vehicle antenna system.

Fig. 4 is a schematic diagram of a vehicle-mounted antenna system provided by the present application.

In this antenna system, the main antenna is connected to MMMPA through a first transmitting circuit, and the auxiliary antenna is connected to MMMPA through a second transmitting circuit. The circuit shown in Fig. 4 may also contain other necessary devices for realizing communication functions.

For example, MMMPA is a radio frequency integrated circuit (RFIC), which can be connected to an intermediate frequency integrated circuit (IFIC). MMMPA is used to enhance the analog signal received from IFIC so that the analog signal can be The form of electromagnetic waves is transmitted to farther places through the main antenna or the auxiliary antenna. IFIC can be connected to a baseband chip to convert the digital signal received from the baseband chip into an analog signal.

When the vehicle antenna system receives a signal, the main antenna or auxiliary antenna converts the electromagnetic wave into an analog signal (current) through the receiving circuit and transmits it to the RFIC. The analog signal is processed by the RFIC and then transmitted to IFIC, and the IFIC converts the analog signal into a digital signal Transmit to the baseband chip.

RFIC and IFIC can be composed of different devices, as shown in Figure 5.

After the baseband chip generates a digital signal, it transmits the digital signal to a modulator; the modulator converts the digital signal into an analog signal, and transmits the analog signal to the mixer; the mixer is responsible for the analog Signal frequency conversion to meet the frequency requirements of different communication systems.

For example, if the vehicle antenna system needs to transmit a signal that meets the requirements of the GSM system (ie, GSM signal), the mixer can convert the frequency of the analog signal to a frequency in the range of 885-909MHZ; if the vehicle antenna system needs to transmit to meet the long-term evolution (long term evolution, LTE) the TDD signal required by the system, the mixer can convert the frequency of the analog signal to a frequency in the range of 1900～1920MHZ; if the vehicle antenna system needs to send FDD signals that meet the requirements of the LTE system, mix The frequency converter can convert the frequency of the analog signal to a frequency in the interval of 1920-1980MHZ.

The frequency required by the mixer is provided by a synthesizer, and the frequency of the synthesizer can be provided by a phase locked loop (PLL) and a voltage controlled oscillator (VCO).

After the mixer performs frequency conversion processing on the analog signal, it transmits the analog signal to a band pass filter (BPF). The BPF is used to filter the analog signal in a specific frequency band. For example, when a vehicle antenna system needs to send a GSM signal At this time, you can only allow analog signals with frequencies in the range of 885-909MHZ to pass, and filter analog signals in other frequency bands. Subsequently, BPF transmits the filtered analog signal to MMMPA.

The MMMPA performs power amplification processing on the analog signal, and transmits the analog signal to a transmitter receiver (transciver) 1 through the first transmitting circuit, and/or transmits the analog signal to the transmitter receiver 2 through the second transmitter circuit. If the transmitter receiver 1 receives an analog signal from MMMPA, it transmits the analog signal to the main antenna, and the main antenna transmits the analog signal in the form of electromagnetic waves. If the transmitter receiver 2 receives an analog signal from MMMPA, it transmits the analog signal to the auxiliary antenna, and the auxiliary antenna transmits the analog signal in the form of electromagnetic waves.

Since the vehicle-mounted antenna system provided by this application has at least two transmitting circuits and at least two antennas, when the main antenna is damaged but the auxiliary antenna is not damaged, the auxiliary antenna can transmit signals without going through the DPDT switching circuit, thereby avoiding Introduce the insertion loss caused by DPDT. Since DPDT is a device directly connected to the antenna, if the DPDT fails, the entire antenna system will not work. Therefore, avoiding the use of DPDT also improves the reliability of the vehicle antenna system.

In addition, because the antenna system is a complex system in the communication field, it not only requires a reasonable layout and correct control logic design, but also needs to be debugged to work normally. Auto manufacturers are manufacturers in the mechanical field and use antenna systems that do not include DPDT. The architecture of the on-board antenna system is simplified, which can reduce the development cost and maintenance cost of automobile manufacturers.

It should be noted that the foregoing embodiment is only an example, and should not be construed as a limitation on the vehicle antenna system provided in this application. Any vehicle-mounted antenna system that includes at least two transmitting circuits and at least two antennas and does not require switching of different transmitting circuits falls within the protection scope of the present application.

The first transmitting circuit and the second transmitting circuit may be the same type of transmitting circuit, for example, both are GSM transmitting circuits; the first transmitting circuit and the second transmitting circuit may also be different types of transmitting circuits, for example, the first transmitting circuit The circuit is a TDD transmitting circuit, and the second transmitting circuit is an FDD transmitting circuit. Among them, the GSM transmitting circuit is a transmitting circuit for transmitting GSM radio frequency signals, the TDD transmitting circuit is a transmitting circuit for transmitting TDD radio frequency signals, and the FDD transmitting circuit is a transmitting circuit for transmitting FDD radio frequency signals.

The TDD radio frequency signal can be the TDD radio frequency signal of the third generation (3G) mobile communication system, it can also be the TDD radio frequency signal of the fourth generation (4G) mobile communication system, and it can also be the fifth generation (5th generation). generation, 5G) TDD radio frequency signal of mobile communication system and TDD radio frequency signal in future mobile communication system.

Similarly, the FDD radio frequency signal can be the FDD radio frequency signal of the 3G mobile communication system, the FDD radio frequency signal of the 4G mobile communication system, the FDD radio frequency signal of the 5G mobile communication system and the FDD radio frequency signal of the future mobile communication system. .

The vehicle antenna system configured with multiple transmitting circuits can adapt to different communication scenarios. When one frequency band is not available, the vehicle antenna system can switch the transmitting circuit and communicate through other frequency bands. Therefore, the vehicle antenna system configured with multiple transmitting circuits has more advantages. High reliability.

The above describes the transmitting circuit of the vehicle antenna system. In some possible designs, the transmitting circuit of the vehicle antenna system can also be multiplexed by the receiving circuit.

Fig. 6 shows another vehicle-mounted antenna system provided by this application.

In the antenna system, the first transmitting circuit includes an FDD transmitting circuit 1 and an FDD receiving circuit 1. The FDD transmitting circuit 1 and the FDD receiving circuit 1 are connected to the transmitting receiver 1 through a duplexer 1; the second transmitting circuit The circuit includes an FDD transmitting circuit 2 and an FDD receiving circuit 2, wherein the FDD transmitting circuit 2 and the FDD receiving circuit 2 are connected to the transmission receiver 2 through the duplexer 2. The duplexer 1 is used for isolating the transmission signal of the FDD transmitting circuit 1 and the receiving signal of the FDD receiving circuit 1, and the duplexer 2 is used for isolating the transmitting signal of the FDD transmitting circuit 2 and the receiving signal of the FDD receiving circuit 2. MMMPA can be connected with BPF or connected with other devices.

Since the FDD transmitting circuit and the FDD receiving circuit share some circuits, the above-mentioned vehicle antenna system simplifies the structure of the radio frequency circuit.

In addition to the FDD transmitting circuit and the FDD receiving circuit may share some circuits, the TDD transmitting circuit and the TDD receiving circuit may also share some circuits.

As shown in FIG. 7, the first transmitting circuit includes SAW filter 1, SPDT1, TDD transmitting circuit 1, and TDD receiving circuit 1. SPDT1 is used to switch between TDD transmitting circuit 1 and TDD receiving circuit 1. Among them, SPDT1 includes a common terminal and two switching terminals. The common terminal is connected to SAW filter 1. The two switching terminals are respectively connected to TDD transmitting circuit 1 and TDD receiving circuit 1. When the vehicle antenna system transmits TDD through antenna 1, When signal, SPDT1 connects TDD transmitting circuit 1 and SAW filter 1, and disconnects TDD receiving circuit 1 and SAW filter 1. When the vehicle antenna system receives TDD signals through antenna 1, SPDT1 connects TDD receiving circuit 1 and SAW filter 1 , Disconnect TDD transmitting circuit 1 and SAW filter 1.

The second transmitting circuit includes SAW filter 2, SPDT2, TDD transmitting circuit 2, and TDD receiving circuit 2. SPDT2 is used to switch between TDD transmitting circuit 2 and TDD receiving circuit 2. Among them, SPDT2 includes a common terminal and two switching terminals. The common terminal is connected to SAW filter 2. The two switching terminals are connected to TDD transmitting circuit 2 and TDD receiving circuit 2 respectively. When the vehicle antenna system transmits TDD through antenna 2, When signal, SPDT2 connects TDD transmitting circuit 2 and SAW filter 2, and disconnects TDD receiving circuit 2 and SAW filter 2. When the vehicle antenna system receives TDD signals through antenna 2, SPDT2 connects TDD receiving circuit 2 and SAW filter 2. , Disconnect TDD transmitting circuit 2 and SAW filter 2.

Since the TDD transmitting circuit and the TDD receiving circuit share some circuits, the above-mentioned vehicle antenna system simplifies the structure of the radio frequency circuit.

In the above example, both the first transmitting circuit and the second transmitting circuit are one circuit. Optionally, the first transmitting circuit may be multiple circuits, and the second transmitting circuit may also be multiple circuits. For example, the second transmission circuit may include at least two of a GSM transmission circuit, a TDD transmission circuit, and an FDD transmission circuit.

FIG. 8 shows a schematic diagram of a vehicle-mounted antenna in which the first transmitting circuit is one transmitting circuit and the second transmitting circuit is two transmitting circuits.

In the vehicle-mounted antenna system, the first transmitting circuit includes an FDD transmitting circuit 1 and an FDD receiving circuit 1. The FDD transmitting circuit 1 and the FDD receiving circuit 1 are connected to the transmitting receiver 1 through a duplexer 1; the second transmitting circuit includes The FDD transmitting circuit 2 and the FDD receiving circuit 2 are connected to the transmitting receiver 2 through the duplexer 2 and the FDD receiving circuit 2. The second transmitting circuit also includes a GSM transmitting circuit 2. Since the auxiliary antenna is connected to the two transmitting circuits, a switch needs to be connected between the auxiliary antenna and the two transmitting circuits. The switch is used to switch the transmitting circuit connected to the auxiliary antenna. The switch is, for example, an integrated transmitter receiver. FEM2.

FIG. 9 shows a schematic diagram of a vehicle-mounted antenna in which the first transmitting circuit is two transmitting circuits and the second transmitting circuit is two transmitting circuits. The difference from the vehicle antenna system shown in FIG. 8 is that the first transmitting circuit also includes a GSM transmitting circuit 1 and an FEM 1 integrated with a transmitting receiver.

Figures 10 and 11 respectively show two other vehicle-mounted antenna systems provided by this application.

In these two vehicle antenna systems, the first transmitting circuit is three transmitting circuits, and the second transmitting circuit is three transmitting circuits. The difference between these two vehicle antenna systems is that the same SAW filter is multiplexed between the TDD transmitting circuit and the TDD receiving circuit in the vehicle antenna system shown in FIG. 11.

Fig. 12 is another vehicle-mounted antenna system provided by this application.

In this vehicle antenna system, FEM1 and FEM2 respectively contain PAs. Therefore, the GSM transmitting circuit 1 does not need to be connected to MMMPA, but to the PA in FEM1. The PA is used to amplify the radio frequency signal output by the GSM transmitting circuit 1; similarly The GSM transmitting circuit 2 does not need to be connected to the MMMPA, but is connected to the PA in the FEM2, which is used to amplify the radio frequency signal output by the GSM transmitting circuit 2.

For any of the above-mentioned vehicle-mounted antenna systems, after the vehicle-mounted antenna system is activated, the method shown in FIG. 13 can be used to determine which antenna to use for communication.

S1301: Detect the working state of the main antenna.

When the working state of the main antenna is normal, the signal is transmitted through the main antenna; when the working state of the main antenna is abnormal, S1302 is executed.

S1302: Detect the working state of the auxiliary antenna.

When the working state of the auxiliary antenna is normal, the signal is transmitted through the auxiliary antenna; when the working state of the auxiliary antenna is abnormal, other backup antennas can be switched.

It should be noted that in S1301, if the auxiliary antenna is normal, the on-board antenna system can receive signals through the main antenna and the auxiliary antenna at the same time, so as to improve the signal reception gain.

In the several embodiments provided in this application, the disclosed system, device, and method may be implemented in other ways. For example, some features of the method embodiments described above may be ignored or not implemented. The device embodiments described above are merely illustrative. The division of units is only a logical function division. In actual implementation, there may be other division methods, and multiple units or components may be combined or integrated into another system. In addition, the coupling between the units or the coupling between the components may be direct coupling or indirect coupling, and the foregoing coupling includes electrical, mechanical, or other forms of connection.

It should be understood that in the various embodiments of the present application, the size of the sequence number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application. The implementation process constitutes any limitation.

In short, the above descriptions are only preferred embodiments of the technical solutions of the present application, and are not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A vehicle-mounted antenna system is characterized in that it includes a main antenna, an auxiliary antenna and a multi-frequency multi-mode power amplifier MMMPA,

The main antenna is connected to the MMMPA through a first transmitting circuit;

The auxiliary antenna is connected to the MMMPA through a second transmitting circuit;

The second transmitting circuit includes at least one of the following three circuits:

A frequency division duplex FDD transmitting circuit, where the FDD transmitting circuit is connected to the auxiliary antenna through a duplexer, and the duplexer is also used to connect the FDD receiving circuit and the auxiliary antenna;

A time division duplex TDD transmitting circuit, where the TDD transmitting circuit is connected to the auxiliary antenna through a surface acoustic wave SAW filter;

Global System for Mobile Communications GSM transmitting circuit.
The vehicle-mounted antenna system according to claim 1, wherein the vehicle-mounted antenna system further comprises a TDD receiving circuit and a single-pole double-throw switch SPDT; the common end of the SPDT is connected to the SAW filter, and the SPDT The two switching terminals are respectively connected with the TDD transmitting circuit and the TDD receiving circuit.
A vehicle-mounted antenna system is characterized in that it includes a main antenna, an auxiliary antenna and a multi-frequency multi-mode power amplifier MMMPA,

The main antenna is connected to the MMMPA through a first transmitting circuit;

The auxiliary antenna is connected to the MMMPA through a second transmitting circuit, and/or the auxiliary antenna is connected to the global system for mobile communication GSM transmitting circuit through a radio frequency front-end module FEM;

The FEM includes a power amplifier PA, and the PA is used to connect the auxiliary antenna and the GSM transmitting circuit;

The second transmitting circuit includes at least one of the following two circuits:

A frequency division duplex FDD transmitting circuit, where the FDD transmitting circuit is connected to the auxiliary antenna through a duplexer, and the duplexer is also used to connect the FDD receiving circuit and the auxiliary antenna;

A time division duplex TDD transmitting circuit, the TDD transmitting circuit is connected to the auxiliary antenna through a surface acoustic wave SAW filter.
The vehicle-mounted antenna system according to claim 3, wherein the vehicle-mounted antenna system further comprises a TDD receiving circuit and a single-pole double-throw switch SPDT; the common end of the SPDT is connected to the SAW filter, and the SPDT The two switching terminals are respectively connected with the TDD transmitting circuit and the TDD receiving circuit.
A communication method, characterized in that it is applied to a vehicle-mounted antenna system, the vehicle-mounted antenna system includes a main antenna, an auxiliary antenna, and a multi-frequency multi-mode power amplifier MMMPA; the main antenna is connected to the MMMPA through a first transmitting circuit; The auxiliary antenna is connected to the MMMPA through a second transmitting circuit; the second transmitting circuit includes at least one of the following three circuits: a frequency division duplex FDD transmitting circuit, and the FDD transmitting circuit is connected to the MMMPA through a duplexer. The auxiliary antenna is connected, the duplexer is also used to connect the FDD receiving circuit and the auxiliary antenna; the time division duplex TDD transmitting circuit, the TDD transmitting circuit is connected to the auxiliary antenna through a surface acoustic wave SAW filter; GSM transmitting circuit of mobile communication system;

The method includes:

Detecting whether the main antenna is normal;

When the main antenna is abnormal, detecting whether the auxiliary antenna is normal;

When the auxiliary antenna is normal, a signal is transmitted through the auxiliary antenna and the second transmitting circuit.
The communication method according to claim 5, wherein the vehicle-mounted antenna system further comprises a TDD receiving circuit and a single-pole double-throw switch SPDT; the common end of the SPDT is connected to the SAW filter, and the two of the SPDT Each switching terminal is respectively connected to the TDD transmitting circuit and the TDD receiving circuit;

The transmitting a signal through the auxiliary antenna and the second transmitting circuit includes:

The signal is transmitted through the auxiliary antenna and the TDD transmitting circuit.
The communication method according to claim 6, wherein before the signal is transmitted through the auxiliary antenna and the TDD transmitting circuit, the method further comprises:

Switching the switching end of the SPDT from the TDD receiving circuit to the TDD transmitting circuit.
A communication method, characterized in that it is applied to a vehicle-mounted antenna system, the vehicle-mounted antenna system includes a main antenna, an auxiliary antenna, and a multi-frequency multi-mode power amplifier MMMPA; the main antenna is connected to the MMMPA through a first transmitting circuit; The auxiliary antenna is connected to the MMMPA through a second transmitting circuit, and/or, the auxiliary antenna is connected to a global system for mobile communication GSM transmitting circuit through a radio frequency front-end module FEM; the FEM includes a power amplifier PA, and the PA is used for connection The auxiliary antenna and the GSM transmitting circuit; the second transmitting circuit includes at least one of the following two circuits: a frequency division duplex FDD transmitting circuit, the FDD transmitting circuit communicates with the auxiliary antenna through a duplexer Connected, the duplexer is also used to connect an FDD receiving circuit and the auxiliary antenna; a time division duplex TDD transmitting circuit, the TDD transmitting circuit is connected to the auxiliary antenna through a surface acoustic wave SAW filter;

The method includes:

Detecting whether the main antenna is normal;

When the main antenna is abnormal, detecting whether the auxiliary antenna is normal;

When the auxiliary antenna is normal, a signal is transmitted through the auxiliary antenna and the second transmitting circuit, and/or a signal is transmitted through the auxiliary antenna and the GSM transmitting circuit.
The communication method according to claim 8, wherein the vehicle-mounted antenna system further comprises a TDD receiving circuit and a single-pole double-throw switch SPDT; the common end of the SPDT is connected to the SAW filter, and two of the SPDT Each switching terminal is respectively connected to the TDD transmitting circuit and the TDD receiving circuit;

The transmitting a signal through the auxiliary antenna and the second transmitting circuit includes:

The signal is transmitted through the auxiliary antenna and the TDD transmitting circuit.
The communication method according to claim 9, characterized in that, before the signal is transmitted through the auxiliary antenna and the TDD transmitting circuit, the method further comprises:

Switching the switching end of the SPDT from the TDD receiving circuit to the TDD transmitting circuit.