A transmitting module of Beidou active antenna

Abstract

The present application is applicable to the field of Beidou satellite communication technology, and provides a transmitting module of a Beidou active antenna, which receives a direct current signal with a constant voltage provided by a Beidou satellite communication terminal through a radio frequency coaxial cable; the transmitting module includes: a variable gain amplifier unit, which is used to perform power amplification processing on a first radio frequency signal after filtering based on a first gain; a power amplifier unit, which is used to perform power amplification processing on the first radio frequency signal after power amplification processing again after being turned on; a switch control unit, which is used to obtain a first field strength signal corresponding to the power of the first radio frequency signal after filtering, and to control the switch of the power amplifier unit based on the first field strength signal; a gain control unit, which is used to obtain a second field strength signal corresponding to the power of the first radio frequency signal after power amplification processing again, and to reversely adjust the first gain based on the second field strength signal, thereby solving the problem that the antenna power amplifier is easily damaged.

Description

Technical Field

[0001] The present application belongs to the field of Beidou satellite communication technology, and in particular, relates to a transmitting module of a Beidou active antenna. Background Art

[0002] The Beidou satellite navigation system is my country's satellite navigation system with independent intellectual property rights. With the rapid development of the Beidou satellite navigation system, various Beidou satellite communication terminals based on the Beidou satellite navigation system have emerged and are widely used in the fields of electricity, agriculture, water conservancy, sea and land transportation.

[0003] Beidou satellite communication terminals usually communicate with Beidou satellites through Beidou antennas. However, in some specific application environments, Beidou antennas cannot be integrated into Beidou satellite communication terminals and need to be processed. A traditional solution is to connect Beidou satellite communication terminals to Beidou antennas through RF cables, so that RF signals and power signals can be transmitted between Beidou satellite communication terminals and Beidou antennas through the RF cables. However, an existing Beidou antenna designed based on the above scheme needs to be powered by a low-voltage DC power supply when in a signal receiving state, and needs to be powered by a high-voltage DC power supply when in a signal transmitting state. This will cause the Beidou antenna to be in a high-low voltage switching state for a long time, which is easy to cause damage to the antenna power amplifier, reduce the reliability of the Beidou antenna, and shorten the service life of the Beidou antenna; and the power of the RF signal output by the above Beidou antenna is unstable, resulting in poor communication quality or high power consumption of the Beidou antenna. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a transmitting module of a Beidou active antenna to solve the problems that the existing Beidou antenna design scheme is prone to cause damage to the antenna power amplifier, reduce the reliability of the Beidou antenna, shorten the service life of the Beidou antenna, and the power of the RF signal output by the existing Beidou antenna is unstable, resulting in poor communication quality or high power consumption of the Beidou antenna.

[0005] The embodiment of the present application provides a transmitting module of a Beidou active antenna, wherein the transmitting module is connected to a Beidou satellite communication terminal via a radio frequency coaxial cable, and the Beidou satellite communication terminal provides a DC signal with a constant voltage to the transmitting module; the transmitting module includes:

[0006] A filtering unit, used for filtering the first radio frequency signal to be transmitted;

[0007] a variable gain amplification unit, connected to the filtering unit, and configured to perform power amplification processing on the first RF signal after the filtering processing based on a first gain;

[0008] a power amplification unit, connected to the variable gain amplification unit, and configured to perform power amplification again on the first radio frequency signal after the power amplification after being turned on;

[0009] a switch control unit, connected to the filtering unit and the power amplifying unit, and configured to obtain a first field strength signal corresponding to the power of the first radio frequency signal after filtering, and perform switch control on the power amplifying unit based on the first field strength signal;

[0010] a passive transmitting antenna, connected to the power amplifying unit, and configured to convert the first radio frequency signal after the power amplification process into a field signal, and transmit the field signal;

[0011] A gain control unit is connected to the power amplification unit and the variable gain amplification unit, and is used to obtain a second field strength signal corresponding to the power of the first RF signal after the power amplification process is performed again, and reversely adjust the first gain based on the second field strength signal.

[0012] Optionally, the switch control unit includes:

[0013] a first field intensity sensing subunit, connected to the filtering unit, configured to perform field intensity sensing on the first radio frequency signal after filtering to obtain the first field intensity signal, and convert the first field intensity signal into a corresponding first sensing level;

[0014] A power amplifier switch control subunit is connected to the first field intensity sensing subunit and the power amplifier unit, and is used to generate a switch control signal according to the first sensing level and a first preset level threshold; wherein the switch control signal is used to control the power amplifier unit to be turned on or off.

[0015] Optionally, the power amplifier switch control subunit generates a start signal when determining that the first sensing level is greater than or equal to the first preset level threshold; wherein the start signal is used to control the power amplification unit to turn on.

[0016] Optionally, the power amplifier switch control subunit generates a shutdown signal when determining that the first sensing level is less than the first preset level threshold; wherein the shutdown signal is used to control the power amplification unit to shut down.

[0017] Optionally, the variable gain amplification unit includes:

[0018] A first-stage preamplifier subunit, connected to the filtering unit, and configured to perform a first-stage power amplification process on the first RF signal after the filtering process based on a second gain, wherein the second gain is adjustable;

[0019] The second-stage preamplifier subunit is used to perform a second-stage power amplification process on the first RF signal after the first-stage power amplification process based on a third gain; wherein the product of the second gain and the third gain is the first gain.

[0020] Optionally, the gain control unit includes:

[0021] a second field intensity sensing subunit, connected to the power amplifying unit, configured to perform field intensity sensing on the first radio frequency signal output by the power amplifying unit to obtain the second field intensity signal, and convert the second field intensity signal into a corresponding second sensing level;

[0022] The gain adjustment subunit is connected to the second field intensity sensing subunit and the first stage preamplification subunit, and is used to generate a reverse gain adjustment signal corresponding to the second sensing level; wherein the reverse gain adjustment signal is used to reversely adjust the second gain.

[0023] Optionally, the gain adjustment subunit generates a first reverse gain adjustment signal when the second sensing level is greater than a second preset level threshold; wherein the first reverse gain adjustment signal is used to lower the second gain.

[0024] Optionally, the gain adjustment subunit generates a second reverse gain adjustment signal when the second sensing level is less than a third preset level threshold; wherein the second reverse gain adjustment signal is used to increase the second gain, and the third preset level threshold is less than the second preset level threshold.

[0025] Optionally, the frequency of the first radio frequency signal is within a preset L frequency band.

[0026] Optionally, the first gain is adjustable.

[0027] The implementation of the transmitting module of a Beidou active antenna provided in the embodiment of the present application has the following beneficial effects:

[0028] A transmitting module of a Beidou active antenna provided in an embodiment of the present application is connected to a Beidou satellite communication terminal via a radio frequency coaxial cable. Since the switch control unit in the transmitting module can realize automatic switch control of the power amplification unit based on the power of the first radio frequency signal, thereby realizing automatic switching control of the signal receiving and transmitting state of the Beidou active antenna, the Beidou satellite communication terminal can provide a direct current signal with a constant voltage to the Beidou active antenna, so that the Beidou active antenna always works in a constant voltage state, thereby effectively solving the problem of easy damage to the antenna power amplifier, improving the reliability of the Beidou active antenna, and extending the service life of the Beidou active antenna; at the same time, through A variable gain amplifier unit and a gain control unit are arranged in the transmitting module of the Beidou active antenna. The gain control unit obtains a field strength signal corresponding to the power of the first radio frequency signal output by the power amplifier unit, and reversely adjusts the first gain based on the field strength signal, thereby realizing adaptive adjustment of the power amplification factor of the first radio frequency signal, so that the power of the first radio frequency signal output by the power amplifier unit can be stabilized within a fixed range, avoiding the problem of poor communication quality caused by the small power of the transmitted signal and the problem of high antenna power consumption caused by the large power of the transmitted signal, thereby improving the communication quality and reducing the power consumption of the Beidou active antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 A schematic diagram of the connection relationship between a Beidou active antenna and a Beidou satellite communication terminal provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the structure of a transmitting module of a Beidou active antenna provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the structure of a Beidou active antenna provided in another embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of a Beidou active antenna is provided in another embodiment of the present application. DETAILED DESCRIPTION

[0034] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0035] It should be understood that the term "and / or" used in the specification of this application and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. In addition, in the description of the specification of this application and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] It should also be understood that references to "one embodiment" or "some embodiments" etc. described in the specification of the present application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Thus, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in the specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0037] See also Figure 1 , Figure 1 A schematic diagram of the connection relationship between a Beidou active antenna and a Beidou satellite communication terminal provided in an embodiment of the present application. Figure 1 As shown, the Beidou active antenna 10 provided in the embodiment of the present application can be connected to the Beidou satellite communication terminal 30 through the radio frequency coaxial cable 20. As an example but not a limitation, the Beidou satellite communication terminal 30 can be an electric power metering device for collecting electric parameter values ​​recorded by an electric meter.

[0038] Specifically, the Beidou active antenna 10 is provided with a unique communication interface, namely, a radio frequency interface 11. The type of the radio frequency interface 11 can be set according to actual needs, and is not limited here. For example, the type of the radio frequency interface 11 can be a nut (Nut, N) type interface, a subminiature version A (SubMiniature version A, SMA) interface, or a radio frequency interface (TNC interface) of TNC Electric Company, etc.

[0039] The Beidou active antenna 10 is connected to one end of the RF coaxial cable 20 through its RF interface 11, and the other end of the RF coaxial cable 20 is connected to the Beidou satellite communication terminal 30. The RF signal and the DC signal can be transmitted between the Beidou active antenna 10 and the Beidou satellite communication terminal 30 through the RF coaxial cable 20, that is, by connecting a RF coaxial cable 20 between the Beidou active antenna 10 and the Beidou satellite communication terminal 30, the transmission of two different signals can be realized, thereby reducing costs and being more convenient to install.

[0040] In the embodiment of the present application, the Beidou satellite communication terminal 30 provides a direct current signal with a constant voltage to the Beidou active antenna 10, that is, no matter whether the Beidou active antenna 10 is in a signal receiving state or a signal transmitting state, the voltage of the direct current signal provided by the Beidou satellite communication terminal 30 to the Beidou active antenna 10 remains unchanged. This can effectively solve the problem of easy damage to the antenna power amplifier, improve the reliability of the Beidou active antenna, and extend the service life of the Beidou active antenna.

[0041] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of a transmitting module of a Beidou active antenna provided in an embodiment of the present application. Figure 2 As shown, the transmitting module 12 in the Beidou active antenna 10 specifically includes:

[0042] The filtering unit 121 is used to perform filtering processing on the first radio frequency signal to be transmitted.

[0043] The variable gain amplifying unit 122 is connected to the filtering unit 121 and is used to perform power amplification processing on the first RF signal after filtering based on a first gain; wherein the first gain is adjustable.

[0044] The power amplifying unit 123 is connected to the variable gain amplifying unit 122 and is used to perform power amplification again on the first RF signal after power amplification after being turned on.

[0045] The switch control unit 124 is connected to the filter unit 121 and the power amplification unit 123, and is used to obtain a first field strength signal corresponding to the power of the first RF signal after filtering, and to perform switch control on the power amplification unit 123 based on the first field strength signal.

[0046] The passive transmitting antenna 125 is connected to the power amplifying unit 123, and is used to convert the first radio frequency signal after the power amplification process again into a field signal, and transmit the field signal.

[0047] The gain control unit 126 is connected to the power amplification unit 123 and the variable gain amplification unit 122, and is used to obtain a second field strength signal corresponding to the power of the first RF signal after the power amplification process is performed again, and reversely adjust the first gain based on the second field strength signal.

[0048] In the embodiment of the present application, since the signal transmission frequency of the Beidou active antenna 10 needs to be within the L frequency band, after the filtering unit 121 receives the first RF signal from the Beidou satellite communication terminal 30, the clutter whose frequency is not within the L frequency band in the first RF signal is filtered, that is, in the embodiment of the present application, the frequency of the first RF signal is within the L frequency band. In a specific application, the center frequency of the L frequency band can be 1615.68 megahertz (MHz), and the L frequency band can be specifically 1615.68 MHz ± 4.08 MHz.

[0049] In the embodiment of the present application, the field strength value of the first field strength signal corresponding to the power of the first RF signal obtained by the switch control unit 124 is positively correlated with the power of the first RF signal after filtering, that is, when the power of the first RF signal after filtering is greater, the field strength value of the first field strength signal corresponding to the power of the first RF signal obtained by the switch control unit 124 is greater; when the power of the first RF signal after filtering is smaller, the field strength value of the first field strength signal corresponding to the power of the first RF signal obtained by the switch control unit 124 is smaller.

[0050] In specific applications, when the Beidou satellite communication terminal 30 transmits a radio frequency signal through the Beidou active antenna 10, the power of the first radio frequency signal output by the filtering unit 121 is usually large, and at this time, the field strength value of the first field strength signal corresponding to the power of the first radio frequency signal obtained by the switch control unit 124 is also large; and when the Beidou active antenna 10 does not transmit a radio frequency signal, the power of the first radio frequency signal output by the filtering unit 121 is usually small, and at this time, the field strength value of the first field strength signal corresponding to the power of the first radio frequency signal obtained by the switch control unit 124 is also small.

[0051] Therefore, in one embodiment of the present application, when the switch control unit 124 detects that the field strength value of the first field strength signal corresponding to the power of the first RF signal is greater than the preset field strength value threshold, it indicates that the Beidou active antenna needs to transmit the RF signal outward at this time. Therefore, the switch control unit 124 can control the power amplification unit 123 to turn on, so that the power amplification unit 123 performs power amplification processing on the first RF signal after filtering, so that the power of the first RF signal output by the power amplification unit 123 meets the transmission requirements.

[0052] In another embodiment of the present application, when the switch control unit 124 detects that the field strength value of the first field strength signal corresponding to the power of the first radio frequency signal is greater than a preset field strength value threshold, it indicates that the Beidou active antenna does not need to transmit a radio frequency signal to the outside at this time. Therefore, the switch control unit 124 can control the power amplification unit 123 to turn off to reduce the power consumption of the Beidou active antenna.

[0053] The embodiment of the present application can realize automatic switching control of the power amplification unit 123 based on the power size of the first RF signal received by the transmitting module 12, thereby realizing automatic switching control of the signal receiving and transmitting state of the Beidou active antenna, and at the same time can also reduce the power consumption of the Beidou active antenna.

[0054] In the embodiment of the present application, the field strength value of the second field strength signal corresponding to the power of the first RF signal obtained by the gain control unit 126 is positively correlated with the power of the first RF signal output by the power amplification unit 123, that is, the greater the power of the first RF signal output by the power amplification unit 123, the greater the field strength value of the second field strength signal corresponding to the power of the first RF signal obtained by the gain control unit 126; the smaller the power of the first RF signal output by the power amplification unit 123, the smaller the field strength value of the second field strength signal corresponding to the power of the first RF signal obtained by the gain control unit 126.

[0055] The gain control unit 126 reversely adjusts the first gain based on the acquired second field strength signal corresponding to the power of the first RF signal, and specifically includes: when the field strength value of the second field strength signal corresponding to the power of the first RF signal is greater than the first preset field strength value threshold, lowering the first gain, thereby reducing the power of the first RF signal output by the power amplification unit 123; when the field strength value of the second field strength signal corresponding to the power of the first RF signal is less than the second preset field strength value threshold, raising the first gain, thereby increasing the power of the first RF signal output by the power amplification unit 123, so that the power of the first RF signal output by the power amplification unit 123 can always be stabilized between the power corresponding to the second preset field strength value threshold and the power corresponding to the first preset field strength value threshold. Wherein, the second preset field strength value threshold is less than the first preset field strength value threshold.

[0056] From the above, it can be seen that a transmitting module of a Beidou active antenna provided in an embodiment of the present application is connected to a Beidou satellite communication terminal via a radio frequency coaxial cable. Since the switch control unit in the transmitting module can realize automatic switch control of the power amplification unit based on the power of the first radio frequency signal, thereby realizing automatic switching control of the signal receiving and transmitting state of the Beidou active antenna, the Beidou satellite communication terminal can provide a direct current signal with a constant voltage for the Beidou active antenna, so that the Beidou active antenna always operates under a constant voltage state, thereby effectively solving the problem of easy damage to the antenna power amplifier, improving the reliability of the Beidou active antenna, and extending the service life of the Beidou active antenna; When the power amplifier is used for transmitting the first RF signal, the power amplifier is used to transmit the first RF signal to the first RF signal output by the power amplifier. ...

[0057] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of a Beidou active antenna provided by another embodiment of the present application. Figure 3 As shown, in this embodiment, the switch control unit 124 may specifically include:

[0058] The first field intensity sensing subunit 1241 is connected to the filtering unit 121, and is used for performing field intensity sensing on the filtered first radio frequency signal to obtain a first field intensity signal, and converting the first field intensity signal into a corresponding first sensing level.

[0059] The power amplifier switch control subunit 1242 is connected to the first field intensity sensing subunit 1241 and the power amplifier unit 123, and is used to generate a switch control signal according to the first sensing level and the first preset level threshold; wherein the switch control signal is used to control the power amplifier unit 123 to be turned on or off.

[0060] In a specific application, the first field intensity sensing subunit 1241 may be a field intensity detection circuit, which may convert the sensed first field intensity signal into a corresponding first induction level according to the conversion relationship between the field intensity value of the field intensity signal and the induction level. The greater the field intensity value of the first field intensity signal, the higher the corresponding first induction level. In a specific application, the field intensity detection circuit may be composed of a detection circuit and a filter circuit.

[0061] In this embodiment, after receiving the first sensing level output by the first field intensity sensing subunit 1241 , the power amplifier switch control subunit 1242 compares the first sensing level with the first preset level threshold.

[0062] The first preset level threshold may be determined according to an induction level corresponding to the radio frequency signal output by the filtering unit 121 when the Beidou active antenna 10 transmits the radio frequency signal.

[0063] In one implementation of this embodiment, the power amplifier switch control subunit 1242 may generate a start signal when it is determined that the first sensing level is greater than or equal to the first preset level threshold; wherein the start signal is used to control the power amplifier unit 123 to turn on. In another implementation of this embodiment, the power amplifier switch control subunit 1242 may generate a shutoff signal when it is determined that the first sensing level is less than the first preset level threshold; wherein the shutoff signal is used to control the power amplifier unit 123 to turn off.

[0064] Please continue reading Figure 3 In another embodiment of the present application, the variable gain amplification unit 122 may specifically include:

[0065] The first stage preamplifier subunit 1221 is connected to the filtering unit 121, and is used to perform a first stage power amplification processing on the first RF signal after filtering based on a second gain; wherein the second gain is adjustable.

[0066] The second stage preamplifier subunit 1222 is used to perform a second stage power amplification processing on the first RF signal after the first stage power amplification processing based on the third gain; wherein the third gain is not adjustable, and the product of the second gain and the third gain is the first gain.

[0067] Furthermore, the gain control unit 126 may specifically include:

[0068] The second field intensity sensing subunit 1261 is connected to the power amplifying unit 123 and is used for performing field intensity sensing on the first radio frequency signal output by the power amplifying unit 123 to obtain a second field intensity signal and converting the second field intensity signal into a corresponding second sensing level.

[0069] The gain adjustment subunit 1262 is connected to the second field intensity sensing subunit 1261 and the first stage preamplification subunit 1221, and is used to generate a reverse gain adjustment signal corresponding to the second sensing level; wherein the reverse gain adjustment signal is used to reversely adjust the second gain.

[0070] In a specific application, the second field strength sensing subunit 1261 may be a field strength detection circuit, which may convert the sensed second field strength signal into a corresponding second sensing level according to the conversion relationship between the field strength value of the field strength signal and the sensing level. The greater the field strength value of the second field strength signal, the higher the corresponding second sensing level. In a specific application, the field strength detection circuit may be composed of a detection circuit and a filtering circuit.

[0071] In this embodiment, after receiving the second sensing level output by the second field intensity sensing subunit 1261, the gain adjustment subunit 1262 can compare the second sensing level with the second preset level threshold and the third preset level threshold, and generate a corresponding response gain adjustment signal based on the comparison result.

[0072] The second preset level threshold may be determined according to a preset maximum power of the transmitted signal, and the third preset level threshold may be determined according to a preset low power of the transmitted signal.

[0073] In one implementation of this embodiment, the gain adjustment subunit 1262 generates a first reverse gain adjustment signal when determining that the second sensing level is greater than the second preset level threshold; wherein the first reverse gain adjustment signal is used to lower the second gain. In another implementation of this embodiment, the gain adjustment subunit 1262 generates a second reverse gain adjustment signal when determining that the second sensing level is less than the third preset level threshold; wherein the second reverse gain adjustment signal is used to increase the second gain.

[0074] Please continue reading Figure 3 In another embodiment of the present application, the receiving module 13 may include:

[0075] The passive receiving antenna 132 is used to receive the second radio frequency signal.

[0076] The receiving path 131 is connected to the passive receiving antenna, and is used to pre-process the second RF signal and send the pre-processed second RF signal to the Beidou satellite communication terminal; wherein the pre-processing at least includes filtering processing and power amplification processing.

[0077] In this embodiment, the passive receiving antenna 132 can specifically convert the field signal based on the electromagnetic field transmission mode into a radio frequency signal based on the radio frequency transmission mode, thereby achieving reception of the second radio frequency signal.

[0078] In this embodiment, since the signal receiving frequency of the Beidou active antenna 10 needs to be within the S band, the frequency of the second RF signal needs to be within the S band. In a specific application, the center frequency of the S band can be 2491.75 MHz, and the S band can specifically be 2491.75 MHz ± 4.08 MHz.

[0079] In a specific application, the receiving path 131 can filter out the clutter signal in the second RF signal whose frequency is not within the S band, and power amplify the filtered second RF signal so that the power of the second RF signal meets the signal reception requirement of the Beidou active antenna.

[0080] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of a Beidou active antenna provided in another embodiment of the present application. Figure 4 As shown, in this embodiment, the Beidou active antenna 10 also includes:

[0081] The feeding module 14 is connected to the Beidou satellite communication terminal 30 and is used to separate the radio frequency signal and the direct current signal transmitted between the Beidou active antenna 10 and the Beidou satellite communication terminal 30 .

[0082] The combining module 15 is connected to the feeding module 14 , the transmitting module 12 and the receiving module 13 , and is used for combining radio frequency signals of different frequency bands transmitted by the Beidou active antenna 10 .

[0083] The power processing module 16 is connected to the feeding module 14 , the transmitting module 12 and the receiving module 13 , and is used to output a DC signal with a constant voltage to the transmitting module 12 and the receiving module 13 .

[0084] In this embodiment, the feeding module 14 separates the RF signal and the DC signal transmitted between the Beidou active antenna 10 and the Beidou satellite communication terminal 30, so that the RF signal and the DC signal are isolated from each other and are not affected by each other.

[0085] The combining module 15 is specifically used to combine the L-band radio frequency signal and the S-band radio frequency signal so that the two are transmitted on the same radio frequency link.

[0086] The power processing module 16 can process the DC signal with a constant voltage provided by the Beidou satellite communication terminal 30 and provide a constant working voltage for the transmitting module 12 and the receiving module 13 .

[0087] It should be noted that, in addition to supplying power to the transmitting module 12 and the receiving module 13 , the power processing module 16 also supplies power to other modules in the Beidou active antenna 10 .

[0088] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A transmitting module of a Beidou active antenna, characterized in that: The transmitting module is connected to the Beidou satellite communication terminal through a radio frequency coaxial cable, and the Beidou satellite communication terminal provides a DC signal with a constant voltage for the transmitting module; the transmitting module includes: A filtering unit, used for filtering the first radio frequency signal to be transmitted; a variable gain amplification unit, connected to the filtering unit, and configured to perform power amplification processing on the first RF signal after the filtering processing based on a first gain; a power amplification unit, connected to the variable gain amplification unit, and configured to perform power amplification again on the first radio frequency signal after the power amplification after being turned on; a switch control unit, connected to the filtering unit and the power amplifying unit, configured to obtain a first field strength signal corresponding to the power of the first radio frequency signal after filtering, and to perform switch control on the power amplifying unit based on the first field strength signal; a passive transmitting antenna, connected to the power amplifying unit, and configured to convert the first radio frequency signal after the power amplification process into a field signal, and transmit the field signal; A gain control unit, connected to the power amplification unit and the variable gain amplification unit, is used to obtain a second field strength signal corresponding to the power of the first RF signal after the power amplification processing is performed again, and reversely adjust the first gain based on the second field strength signal; the field strength value of the second field strength signal is positively correlated with the power of the first RF signal after the power amplification processing is performed again.

2. The transmitting module according to claim 1, characterized in that: The switch control unit comprises: a first field intensity sensing subunit, connected to the filtering unit, and configured to perform field intensity sensing on the first radio frequency signal after filtering to obtain the first field intensity signal, and convert the first field intensity signal into a corresponding first sensing level; A power amplifier switch control subunit is connected to the first field intensity sensing subunit and the power amplifier unit, and is used to generate a switch control signal according to the first sensing level and a first preset level threshold; wherein the switch control signal is used to control the power amplifier unit to be turned on or off.

3. The transmitting module according to claim 2, characterized in that: The power amplifier switch control subunit generates a start signal when determining that the first sensing level is greater than or equal to the first preset level threshold; wherein the start signal is used to control the power amplifier unit to turn on.

4. The transmitting module according to claim 2, characterized in that: The power amplifier switch control subunit generates a shutdown signal when determining that the first sensing level is less than the first preset level threshold; wherein the shutdown signal is used to control the power amplifier unit to shut down.

5. The transmitting module according to claim 1, characterized in that: The variable gain amplification unit comprises: A first-stage preamplifier subunit, connected to the filtering unit, and configured to perform a first-stage power amplification process on the first RF signal after the filtering process based on a second gain, wherein the second gain is adjustable; The second-stage preamplifier subunit is used to perform a second-stage power amplification process on the first RF signal after the first-stage power amplification process based on a third gain; wherein the product of the second gain and the third gain is the first gain.

6. The transmitting module according to claim 5, characterized in that: The gain control unit comprises: a second field intensity sensing subunit, connected to the power amplifying unit, configured to perform field intensity sensing on the first radio frequency signal output by the power amplifying unit to obtain the second field intensity signal, and convert the second field intensity signal into a corresponding second sensing level; The gain adjustment subunit is connected to the second field intensity sensing subunit and the first stage preamplification subunit, and is used to generate a reverse gain adjustment signal corresponding to the second sensing level; wherein the reverse gain adjustment signal is used to reversely adjust the second gain.

7. The transmitting module according to claim 6, characterized in that: The gain adjustment subunit generates a first reverse gain adjustment signal when the second sensing level is greater than a second preset level threshold; wherein the first reverse gain adjustment signal is used to reduce the second gain.

8. The transmitting module according to claim 6, characterized in that: The gain adjustment subunit generates a second reverse gain adjustment signal when the second sensing level is less than a third preset level threshold; wherein the second reverse gain adjustment signal is used to increase the second gain, and the third preset level threshold is less than the second preset level threshold.

9. The transmitting module according to any one of claims 1 to 8, characterized in that: The frequency of the first radio frequency signal is within a preset L frequency band.

10. The transmitting module according to any one of claims 1 to 8, characterized in that: The first gain is adjustable.

Images