Beidou short message transmitting and receiving radio frequency front-end system

Abstract

The utility model discloses a Beidou short message transmit-receive radio frequency front end system, comprising a B1L1 frequency point low noise amplification module used for processing a B1L1 frequency point signal to obtain a processed B1L1 frequency point signal and outputting the processed B1L1 frequency point signal to a rear end satellite navigation receiver; the combiner module is connected with the B1L1 frequency point low-noise amplification module and is used for signal combining processing; the B2B3 frequency point low noise amplification module is connected with the combiner module and is used for processing the B2B3 frequency point signal to obtain a processed B2B3 frequency point signal and outputting the processed B2B3 frequency point signal to a rear-end satellite navigation receiver; and the SL antenna module is connected with the combiner module, is used for processing the RDSS frequency point signal to obtain a processed RDSS transceiving frequency point signal, and is also used for outputting an S frequency point receiving signal of the processed RDSS transceiving frequency point signal to a rear-end satellite navigation receiver and outputting an L frequency band transmitting signal input by the rear-end satellite navigation receiver, so that the reliability and the stability of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field related to Beidou short message reception and transmission, and in particular to a Beidou short message reception and transmission radio frequency front-end system. Background Art

[0002] At present, in the working mode of the low-orbit satellite integrated electronic system and the application scenarios of simultaneous operation of RDSS and RNSS, it is necessary to consider the impact of RDSS short message transmission on GNSS reception and the impact of S-band spread spectrum and USB system spread spectrum measurement and control on RDSS reception. During short message communication, the output power of the power amplifier module is 37dBm, the normal gain of the transmitting antenna is above 4dBi, and the isolation between the transmitting antenna and the GNSS receiving antenna is about 20dB. However, if the signal power entering the GNSS antenna is still at a relatively high level, the transmission power of the S-band measurement and control transmitting unit will also cause blocking of RDSS reception. Utility Model Content

[0003] Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through the practice of the present invention. The present invention provides a Beidou short message transceiver radio frequency front-end system, which can improve system reliability and stability.

[0004] The utility model provides a Beidou short message transceiver radio frequency front-end system, comprising:

[0005] A B1L1 frequency low noise amplifier module is used to process the B1L1 frequency signal to obtain a processed B1L1 frequency signal, and output the processed B1L1 frequency signal to a back-end satellite navigation receiver;

[0006] The combiner module is connected to the B1L1 frequency point low noise amplifier module for signal combining processing;

[0007] A B2B3 frequency point low noise amplifier module, connected to the combiner module, for processing the B2B3 frequency point signal, obtaining a processed B2B3 frequency point signal, and outputting the processed B2B3 frequency point signal to the back-end satellite navigation receiver;

[0008] The SL antenna module is connected to the combiner module, and is used to process the RDSS frequency signal to obtain the processed RDSS frequency signal. It is also used to output the S frequency receiving signal of the processed RDSS transceiver frequency signal to the back-end satellite navigation receiver, and output the L frequency band transmission signal input by the back-end satellite navigation receiver.

[0009] The Beidou short message transceiver radio frequency front-end system provided by the utility model has at least the following beneficial effects:

[0010] The system includes a B1L1 frequency low noise amplifier module, which is used to process the B1L1 frequency signal, obtain the processed B1L1 frequency signal, and output the processed B1L1 frequency signal to the back-end satellite navigation receiver; a combiner module, which is connected to the B1L1 frequency low noise amplifier module and is used for signal combining processing; a B2B3 frequency low noise amplifier module, which is connected to the combiner module and is used to process the B2B3 frequency signal, obtain the processed B2B3 frequency signal, and output the processed B2B3 frequency signal to the back-end satellite navigation receiver; an SL antenna module, which is connected to the combiner module and is used to process the RDSS frequency signal, obtain the processed RDSS transceiver frequency signal, and output the S frequency reception signal of the processed RDSS transceiver frequency signal to the back-end satellite navigation receiver, and output the L-band transmission signal input by the back-end satellite navigation receiver, thereby improving the system reliability and stability.

[0011] According to some embodiments of the present utility model, the Beidou short message transceiver radio frequency front-end system further includes:

[0012] The power amplifier power supply module is connected to the SL antenna module and is used to provide power to the SL antenna module and also to suppress surges on the input power supply.

[0013] According to some embodiments of the present utility model, the B1L1 frequency low noise amplification module includes:

[0014] B1L1 high-gain four-arm helical antenna module, used to receive navigation signals from BDS-B1I, BDS-B1C and GPS-L1 frequencies;

[0015] A B1L1 cavity filter module is connected to the B1L1 high-gain quadrifilar helical antenna module and is used to filter out other clutter and interference signals except the BDS-B1I frequency point, the BDS-B1C frequency point and the GPS-L1 frequency point;

[0016] The B1L1 frequency low noise amplifier module is connected to the B1L1 cavity filter module and is used to perform low noise amplification on the received weak navigation signal of the B1L1 frequency to obtain an amplified signal; and is also used to output the amplified signal to the back-end satellite navigation receiver.

[0017] According to some embodiments of the present utility model, the B2B3 frequency point low noise amplification module includes:

[0018] The B2B3 flat antenna module is used to receive navigation signals from BDS-B2a, BDS-B2b and BDS-B3I frequencies.

[0019] According to some embodiments of the present utility model, the B2B3 frequency point low noise amplification module further includes:

[0020] The B2B3 frequency low noise amplifier module is connected to the B2B3 flat antenna module and is used to perform low noise amplification on the received weak navigation signal of the B2B3 frequency to obtain a low noise amplified signal; it is also used to output the low noise amplified signal to the back-end satellite navigation receiver.

[0021] According to some embodiments of the present utility model, the SL antenna module includes:

[0022] The SL flat antenna module is used to receive short message reception signals at the RDSS-S frequency and send transmission signals at the RDSS-L frequency.

[0023] According to some embodiments of the present utility model, the SL antenna module further includes:

[0024] The short message transmission cavity filter module is connected to the SL flat antenna module and is used to filter out clutter signals except the short message transmission frequency band.

[0025] According to some embodiments of the present utility model, the SL antenna module further includes:

[0026] The RDSS-S frequency low noise amplifier module is connected to the SL flat antenna module, performs low noise amplification on the received weak navigation signal of the RDSS-S frequency to obtain the amplified RDSS-S frequency signal; and is also used to output the amplified RDSS-S frequency signal to the back-end satellite navigation receiver;

[0027] The RDSS-L band power amplifier module is connected to the short message transmission cavity filter module, performs power amplification on the communication of the transmitted RDSS-L frequency point to obtain a power-amplified signal, and is also used to output the power-amplified signal to the L band interface of the SL flat antenna.

[0028] According to some embodiments of the present utility model, the combiner module includes:

[0029] The first combiner module has one end connected to the B1L1 frequency point low noise amplifier module and the other end connected to the B2B3 frequency point low noise amplifier module, and is used for combining the B1L1 frequency point and the B2B3 frequency point.

[0030] According to some embodiments of the present utility model, the combiner module further includes:

[0031] A second combiner module has one end connected to the SL antenna module and the other end connected to the first combiner module, and is used to combine the RDSS frequency signal with the output signal of the first combiner module.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1 It is a structural schematic diagram of a Beidou short message transceiver radio frequency front-end system provided by an embodiment of the utility model;

[0035] Figure 2 It is a specific structural diagram of a Beidou short message transceiver radio frequency front-end system provided by an embodiment of the utility model;

[0036] Figure 3 It is a structural schematic diagram of a power amplifier power supply module provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of this article, it is necessary to understand that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0041] Brief background introduction: At present, in the working mode of low-orbit satellite integrated electronic system and the application scenario of simultaneous operation of RDSS and RNSS, it is necessary to consider the impact of RDSS short message transmission on GNSS reception. During short message communication, the output power of the power amplifier module is 37dBm, the normal gain of the transmitting antenna is above 4dBi, and the isolation between the transmitting antenna and the GNSS receiving antenna is about 20dB. However, if the signal power entering the GNSS antenna is still at a high level, it is necessary to add filtering devices at the front end to avoid blocking of the low-noise amplifier of the receiving channel and the frequency conversion channel at the back end.

[0042] In order to solve the above technical defects, refer to Figure 1 and Figure 2 An embodiment of the utility model provides a Beidou short message transceiver radio frequency front-end system, and the Beidou short message transceiver radio frequency front-end system includes:

[0043] A B1L1 frequency low noise amplifier module is used to process a B1L1 frequency signal to obtain a processed B1L1 frequency signal, and output the processed B1L1 frequency signal to a back-end satellite navigation receiver;

[0044] The combiner module is connected to the B1L1 frequency point low noise amplifier module for signal combining processing;

[0045] The B2B3 frequency point low noise amplifier module is connected to the combiner module, and is used to process the B2B3 frequency point signal, obtain the processed B2B3 frequency point signal, and output the processed B2B3 frequency point signal to the back-end satellite navigation receiver;

[0046] The SL antenna module is connected to the combiner module, and is used to process the RDSS frequency signal to obtain the processed RDSS transceiver frequency signal. It is also used to output the S-frequency receiving signal of the processed RDSS transceiver frequency signal to the back-end satellite navigation receiver, and output the L-band transmitting signal input by the back-end satellite navigation receiver.

[0047] Specifically, in some embodiments, the size and weight of the integrated electronic GNSS module and its preamplifier unit are 500g. The use of the present application can reduce the size of the RF front-end amplifier unit to 100×105×15mm and the weight to 215g, reducing the weight by 285g. At the same time, multiple components are combined into one unit, reducing the number of system components and improving system reliability.

[0048] The system includes a B1L1 frequency low noise amplifier module, which is used to process the B1L1 frequency signal, obtain the processed B1L1 frequency signal, and output the processed B1L1 frequency signal to the back-end satellite navigation receiver; a combiner module, which is connected to the B1L1 frequency low noise amplifier module and is used for signal combining processing; a B2B3 frequency low noise amplifier module, which is connected to the combiner module and is used to process the B2B3 frequency signal, obtain the processed B2B3 frequency signal, and output the processed B2B3 frequency signal to the back-end satellite navigation receiver; an SL antenna module, which is connected to the combiner module and is used to process the RDSS frequency signal, obtain the processed RDSS transceiver frequency signal, and output the S frequency reception signal of the processed RDSS transceiver frequency signal to the back-end satellite navigation receiver, and output the L-band transmission signal input by the back-end satellite navigation receiver, thereby improving the system reliability and stability.

[0049] In some embodiments of the present utility model, the Beidou short message transceiver radio frequency front-end system further includes:

[0050] The power amplifier power module is connected to the SL antenna module to provide power to the SL antenna module and to suppress surges on the input power supply.

[0051] Specifically, refer to Figure 3 , the receiver is directly fed with power. This application adopts a signal +3.3V power supply one-line design. After the power enters each receiving channel, LDO is used internally for power supply, and the output voltage is 3.0V. This can reduce the long-term power consumption of the channel as much as possible. At the same time, the use of ultra-low noise LDO can ensure that the low-noise amplifier is not affected by the noise on the external power supply and can work in a relatively stable environment.

[0052] Specifically, the Beidou short message transmitting unit of the present application adopts a separate power supply and separate amplification design. Taking into account that the power amplifier itself generates a lot of noise when working, if its power supply and receiving end are in the same cavity, it is difficult to avoid entering the low-noise unit through the power ground. Therefore, the transmitting end power amplifier adopts a +28V power supply and directly draws power from the power bus of the integrated electronic unit. This not only reduces the energy consumption pressure of the main power supply of the integrated electronic long-term working unit; it also reduces the impact on other systems of the integrated electronics during transmission; and improves the working stability of the transmitting unit.

[0053] Specifically, the power input end of the power amplifier of the present application adopts a fuse plus MOS method, which can limit the surge when the transmitting power is turned on to within the range allowed by the system, thereby protecting the back-end DC / DC and other units from being damaged by surge current. The DC / DC unit adopts a high-reliability mature power supply design to reduce its own ripple output and improve the quality of the power amplifier signal.

[0054] Specifically, the power amplifier of the present application is controlled simultaneously by power detection and external control signals. The Vref output of the power amplifier is turned on only when the detection unit and the control signal are sent out at the same time. Only then does the power amplifier start working, thus avoiding possible erroneous triggering of the power amplifier transmission in the system and ensuring the reliability of the system.

[0055] In some embodiments of the present invention, the B1L1 frequency low noise amplifier module includes:

[0056] B1L1 high-gain four-arm helical antenna module, used to receive navigation signals from BDS-B1I, BDS-B1C and GPS-L1 frequencies;

[0057] The B1L1 cavity filter module is connected to the B1L1 high-gain quadrifilar helical antenna module to filter out clutter and interference signals other than the BDS-B1I frequency point, BDS-B1C frequency point and GPS-L1 frequency point;

[0058] The B1L1 frequency low noise amplifier module is connected to the B1L1 cavity filter module and is used to perform low noise amplification on the received weak navigation signal of the B1L1 frequency to obtain an amplified signal; it is also used to output the amplified signal to the back-end satellite navigation receiver.

[0059] Specifically, refer to Figure 2 The B1L1 receiver uses a four-arm helical antenna, which has excellent reception characteristics and spectrum distribution characteristics. The reception gain of other frequency bands is low and has good isolation. After connecting to the cavity filter at the back end, it can ensure that the reception performance of the receiver is not affected when short messages are transmitted.

[0060] Specifically, the B1L1 receiving amplifier unit is placed in a SAW filter after the SPF-5043Z completes amplification. Its suppression characteristics for S and other L frequencies are used to ensure the out-of-band suppression characteristics of the channel. The separate amplification solution can accurately adjust its channel gain to be consistent with other channels. This is also the design method of the other two channels. Although it increases the cost and system complexity, each channel can be designed independently and each frequency band can be filtered separately. The out-of-band suppression performance of the system can be relatively good, avoiding non-working frequency band signals from entering the amplification and frequency conversion links of the satellite navigation receiver.

[0061] In some embodiments of the present utility model, the B2B3 frequency point low noise amplification module includes:

[0062] The B2B3 flat antenna module is used to receive navigation signals from BDS-B2a, BDS-B2b and BDS-B3I frequencies.

[0063] The B2B3 frequency low noise amplifier module is connected to the B2B3 flat antenna module and is used to perform low noise amplification on the received weak navigation signal of the B2B3 frequency to obtain a low noise amplified signal; it is also used to output the low noise amplified signal to the back-end satellite navigation receiver.

[0064] Specifically, the B2 and B3 frequencies of GNSS and the B2b receiving frequency of the global short message use flat patch antennas that are directly connected to the active amplifier component. By suppressing the short message transmitter at the antenna end, the isolation of the system can be ensured.

[0065] Specifically, the B2B3 receiving channel is the receiving channel for GNSS and global short beam, which utilizes the gain characteristics of the passive antenna unit and the working characteristics of the surface acoustic wave filter to ensure the out-of-band suppression of the channel. The working mode of the two-stage amplifier is also to ensure the consistency of the channel gain and avoid the different noise powers after combining affecting the channel characteristics after combining. The present application ensures the stability of each receiving system by combining the L-band signal first and then combining it with the S-band signal.

[0066] In some embodiments of the present invention, the SL antenna module includes:

[0067] The SL flat antenna module is used to receive short message reception signals at the RDSS-S frequency and send transmission signals at the RDSS-L frequency.

[0068] The short message transmission cavity filter module is connected to the SL flat antenna module and is used to filter out clutter signals except the short message transmission frequency band.

[0069] The RDSS-S frequency low noise amplifier module is connected to the SL flat antenna module to perform low noise amplification on the received weak navigation signal of the RDSS-S frequency to obtain the amplified RDSS-S frequency signal; it is also used to output the amplified RDSS-S frequency signal to the back-end satellite navigation receiver;

[0070] The RDSS-L band power amplifier module is connected to the short message transmission cavity filter module to amplify the power of the transmitted RDSS-L frequency communication to obtain the power amplified signal, and is also used to output the power amplified signal to the L band interface of the SL flat antenna.

[0071] Specifically, the S-frequency low noise amplifier built-in dielectric filter in the RDSS-S-frequency low noise amplifier module can select the working frequency band according to the working frequency of the S-band measurement and control, ensuring that short message S-band reception and S-band measurement and control work simultaneously.

[0072] Specifically, the SL antenna is a Beidou regional short message receiving and sending and global short message transmitting antenna. Due to the relatively large transmission power, it is necessary to design an out-of-band suppression cavity filter internally to ensure that the noise interference during transmission is reduced to the range that the system can allow.

[0073] Specifically, a dielectric filter is placed at the front end of the RDSS receiving unit to filter out out-of-band clutter signals. Combined with the near-end suppression performance of the SAW filter, the suppression performance of far-end and near-end out-of-band signals can be well achieved. Similarly, the multi-stage amplification method can ensure the channel gain requirements.

[0074] In some embodiments of the present invention, the combiner module includes:

[0075] The first combiner module has one end connected to the B1L1 frequency point low noise amplifier module and the other end connected to the B2B3 frequency point low noise amplifier module, and is used for combining the B1L1 frequency point and the B2B3 frequency point.

[0076] The second combiner module has one end connected to the SL antenna module and the other end connected to the first combiner module, and is used to combine the RDSS frequency signal with the output signal of the first combiner module.

[0077] This application integrates all the functions of the original GNSS positioning module and the short message communication unit front-end transceiver unit, and expands the GNSS receiving frequency from the original B1L1 frequency to five receiving frequencies: B1I, B1C, L1CA, B3I and B2b, thereby improving the reliability of positioning and speed measurement while reducing procurement costs.

[0078] The present application solves the problem of simultaneous operation of low-orbit satellite S measurement and control, Beidou short message S reception, GNSS reception and short message sending; improves the system stability of short message transmission control of low-orbit satellite platform; improves the reliability and stability of the low-orbit satellite platform transceiver front end; realizes low-orbit satellite platform GNSS multi-frequency reception and Beidou regional and global short message same-platform operation, and improves the reliability of satellite platform operation.

[0079] The above is a specific description of the preferred implementation of the embodiments of the present application, but the embodiments of the present application are not limited to the above-mentioned implementation methods. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the embodiments of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the embodiments of the present application.

Claims

1. A Beidou short message transceiver radio frequency front-end system, characterized in that: include: A B1L1 frequency low noise amplifier module is used to process the B1L1 frequency signal to obtain a processed B1L1 frequency signal, and output the processed B1L1 frequency signal to a back-end satellite navigation receiver; The combiner module is connected to the B1L1 frequency point low noise amplifier module for signal combining processing; A B2B3 frequency point low noise amplifier module is connected to the combiner module, and is used to process the B2B3 frequency point signal, obtain the processed B2B3 frequency point signal, and output the processed B2B3 frequency point signal to the back-end satellite navigation receiver; The SL antenna module is connected to the combiner module, and is used to process the RDSS frequency signal to obtain the processed RDSS frequency signal, and is also used to output the S frequency receiving signal of the processed RDSS transceiver frequency signal to the back-end satellite navigation receiver, and output the L frequency band transmitting signal input by the back-end satellite navigation receiver; The power amplifier power supply module is connected to the SL antenna module and is used to provide power to the SL antenna module and also to suppress surges on the input power supply.

2. The Beidou short message transceiver radio frequency front-end system according to claim 1, characterized in that: The B1L1 frequency low noise amplifier module includes: B1L1 high-gain four-arm helical antenna module, used to receive navigation signals from BDS-B1I, BDS-B1C and GPS-L1 frequencies; A B1L1 cavity filter module is connected to the B1L1 high-gain quadrifilar helical antenna module and is used to filter out other clutter and interference signals except the BDS-B1I frequency point, the BDS-B1C frequency point and the GPS-L1 frequency point; The B1L1 frequency low noise amplifier module is connected to the B1L1 cavity filter module and is used to perform low noise amplification on the received weak navigation signal of the B1L1 frequency to obtain an amplified signal; and is also used to output the amplified signal to the back-end satellite navigation receiver.

3. The Beidou short message transceiver radio frequency front-end system according to claim 1, characterized in that: The B2B3 frequency low noise amplification module includes: The B2B3 flat antenna module is used to receive navigation signals from BDS-B2a, BDS-B2b and BDS-B3I frequencies.

4. The Beidou short message transceiver radio frequency front-end system according to claim 3, characterized in that: The B2B3 frequency low noise amplification module also includes: The B2B3 frequency low noise amplifier module is connected to the B2B3 flat antenna module and is used to perform low noise amplification on the received weak navigation signal of the B2B3 frequency to obtain a low noise amplified signal; it is also used to output the low noise amplified signal to the back-end satellite navigation receiver.

5. The Beidou short message transceiver radio frequency front-end system according to claim 1, characterized in that: The SL antenna module includes: The SL flat antenna module is used to receive short message reception signals at the RDSS-S frequency and send transmission signals at the RDSS-L frequency.

6. The Beidou short message transceiver radio frequency front-end system according to claim 5, characterized in that: The SL antenna module also includes: The short message transmission cavity filter module is connected to the SL flat antenna module and is used to filter out clutter signals except the short message transmission frequency band.

7. The Beidou short message transceiver radio frequency front-end system according to claim 6, characterized in that: The SL antenna module also includes: The RDSS-S frequency low noise amplifier module is connected to the SL flat antenna module, performs low noise amplification on the received weak navigation signal of the RDSS-S frequency to obtain the amplified RDSS-S frequency signal; and is also used to output the amplified RDSS-S frequency signal to the back-end satellite navigation receiver; The RDSS-L band power amplifier module is connected to the short message transmission cavity filter module, performs power amplification on the communication of the transmitted RDSS-L frequency point to obtain a power-amplified signal, and is also used to output the power-amplified signal to the L band interface of the SL flat antenna.

8. The Beidou short message transceiver radio frequency front-end system according to claim 1, characterized in that: The combiner module comprises: The first combiner module has one end connected to the B1L1 frequency point low noise amplifier module and the other end connected to the B2B3 frequency point low noise amplifier module, and is used for combining the B1L1 frequency point and the B2B3 frequency point.

9. The Beidou short message transceiver radio frequency front-end system according to claim 8, characterized in that: The combiner module also includes: A second combiner module has one end connected to the SL antenna module and the other end connected to the first combiner module, and is used to combine the RDSS frequency signal with the output signal of the first combiner module.

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