CN218679062U - Receiving-transmitting frequency synthesis fast switching unit and satellite terminal radio frequency channel system - Google Patents
Receiving-transmitting frequency synthesis fast switching unit and satellite terminal radio frequency channel system Download PDFInfo
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- CN218679062U CN218679062U CN202222455130.7U CN202222455130U CN218679062U CN 218679062 U CN218679062 U CN 218679062U CN 202222455130 U CN202222455130 U CN 202222455130U CN 218679062 U CN218679062 U CN 218679062U
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Abstract
The utility model discloses a receiving and transmitting frequency synthesis fast switching unit and a satellite terminal radio frequency channel system, wherein the system comprises a receiving channel unit, a transmitting channel unit and a receiving and transmitting frequency synthesis fast switching unit; the receiving channel unit and the transmitting channel unit are respectively connected with the receiving and transmitting frequency synthesis fast switching unit; the design of a hardware circuit can be effectively simplified, the reliability of a finished product is improved, and the hardware cost is reduced.
Description
Technical Field
The utility model relates to a satellite communication technical field, in particular to receiving and dispatching are combined fast switch over unit and satellite terminal radio frequency channel system frequently.
Background
Currently, america and Europe are rapidly promoting satellite Internet engineering construction, and China also brings satellite Internet into new infrastructure. Some leading-edge commercial companies have begun a tight layout of large-scale satellites, and the emerging low-orbit satellite constellation plans are continuously followed up, with the conflict between space frequency and orbit contention.
As a consumer support for the satellite internet, satellite communication terminals occupy an extremely important part of the overall constellation plan. On one hand, due to the rapid development of the mobile internet era, the ultra-wideband and high-throughput satellite communication terminal technology with large data capacity is the key point of the current application research. On the other hand, based on the existing numerous satellite constellation plans and frequency and orbit resource contention for each operation, the satellite communication terminal technology that the ultra-wideband multi-beam can be compatible with multiple satellites in the same constellation and multiple satellites in different constellations (even supporting simultaneous online communication of multiple satellite constellations) also needs to pay attention.
The method is a final target of technical development and breakthrough, and aims to provide a quick, flexible and low-cost satellite communication terminal for a final consumer user, improve the use comfort and satisfaction of the client and ensure good user experience.
At present, a fixed single-beam scheme is adopted by a ground satellite communication terminal aiming at high, medium and low orbit satellites, and the ground satellite communication terminal is designed and used only aiming at a specific satellite, can only provide a narrow-band working frequency range, and does not support broadband multi-beam switching of multiple frequency bands.
The existing satellite communication terminals adopt a fixed frequency point single-beam scheme, and a radio frequency channel adopts fixed single-frequency point frequency conversion or narrow-band two-to-three point frequency conversion. The radio frequency channel does not have a multi-band frequency conversion function, and the narrow-band two-to-three-point frequency conversion is only fixed to a single frequency point in application and is not public for frequency band switching. The method is specifically designed for only performing a specific constellation and a specific function of the specific constellation;
in a multi-beam scheme in high-end industry, each beam is realized by an independent phased array antenna array surface unit, a radio frequency channel unit and a baseband unit basic function unit, and a plurality of independent complete systems are combined to finally realize the multi-beam scheme.
In the current single-beam low-orbit satellite communication terminal, in the satellite communication switching process, the radio frequency channel frequency switching time is long, the requirement of realizing satellite capturing by fast beam control switching cannot be met, the traditional low-orbit satellite has no accurate constellation ephemeris information, the satellite capturing time is also influenced, the communication signal is interrupted in the satellite switching process, the continuous and stable communication state cannot be ensured, and the user experience is poor;
the radio frequency channels of the existing terminal products are designed aiming at specific satellite constellations, fixed single-frequency point frequency conversion or narrow-band two-to-three point frequency conversion is adopted, the range of variable frequency bands of radio frequency is very narrow, and as a result, the terminal only supports a single satellite constellation with specific frequency points and cannot be compatible with the explosive growth requirements of low-orbit high-flux constellation development;
the existing multi-beam schemes all use a way of combining multiple sets of independent complete terminal systems. In the technical scheme, each complete terminal system is provided with an independent phased array antenna array surface unit, a radio frequency channel unit, a baseband unit and other parts. The scheme is more complex, the reliability is relatively lower, and the hardware cost is higher.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists among the above-mentioned prior art, the utility model provides a receiving and dispatching are combined fast switch over unit and multi-beam high flux satellite communication terminal radio frequency channel system frequently, wherein the receiving and dispatching are combined fast switch over unit frequently and can be provided a plurality of variable frequency points to provide local oscillator signal, combine fast switch over unit basis frequently simultaneously on, provide a multi-beam high flux satellite communication terminal radio frequency channel system, can effectual simplification hardware circuit design, improve the finished product reliability, reduce the hardware cost simultaneously.
In order to realize the technical purpose, the utility model provides a following technical scheme:
a transmit-receive frequency synthesizer fast switching unit, comprising: the receiving and transmitting frequency synthesis fast switching unit is used for phase-locking and outputting a plurality of variable frequency points so as to provide local oscillation signals; the receiving and transmitting frequency synthesis fast switching unit comprises a crystal oscillator circuit, a first phase locking circuit and a second phase locking circuit; the first phase locking circuit and the second phase locking circuit are respectively connected with the crystal oscillator circuit; the crystal oscillator circuit is used for generating a reference signal and performing power division on the reference signal; the first phase-locked circuit and the second phase-locked circuit are respectively used for processing the reference signals after power division to generate a plurality of variable frequency points so as to provide local oscillation signals.
Optionally, the crystal oscillator circuit includes a first constant temperature crystal oscillator and a first power divider; the first constant temperature crystal oscillator is connected with the first power divider.
Optionally, the first phase-locked circuit includes a plurality of receiving integrated VCO phase-locked loops, a receiving first radio frequency switch, a receiving first low-pass filter, a receiving first driving amplifier, and a receiving second low-pass filter; the receiving integrated VCO phase-locked loops are respectively connected with the first power divider and the receiving first radio frequency switch; the receiving first radio frequency switch, the receiving first low-pass filter, the receiving first driving amplifier and the receiving second low-pass filter are connected in sequence; the receiving second low-pass filter provides the local oscillator signal to the external output.
Optionally, the number of the receiving integrated VCO phase-locked loops is N, and the receiving integrated VCO phase-locked loops are used for outputting M different frequency point signals in a phase-locked manner, where 1-N-M.
Optionally, the second phase-locked loop circuit includes a plurality of transmit integrated VCO phase-locked loops, a transmit first radio frequency switch, and a transmit first low-pass filter; the transmitting integrated VCO phase-locked loops are respectively connected with the first power divider and the transmitting first radio frequency switch; the transmitting first radio frequency switch is connected with the transmitting first low-pass filter; the transmitting first low-pass filter provides a local oscillator signal to the external output.
Optionally, the number of the plurality of transmit integrated VCO phase-locked loops is N, and the transmit integrated VCO phase-locked loops are used for outputting M different frequency point signals in a phase-locked manner, where 1-N-M.
Optionally, the transmitting first radio frequency switch is a multiple-to-1 switch, and is configured to gate one path of signals in the multiple transmitting integrated VCO phase-locked loops to the transmitting first low-pass filter; and/or the receiving first radio frequency switch is a multiple-selection-1 switch and is used for gating one path of signals in the multiple receiving integrated VCO phase-locked loops to the receiving first low-pass filter.
Based on the same concept, the present application further provides a satellite terminal radio frequency channel system, including: the receiving channel unit, the transmitting channel unit and the receiving and transmitting frequency synthesis fast switching unit; the receiving channel unit and the transmitting channel unit are respectively connected with the receiving and transmitting frequency synthesis fast switching unit; the receiving and transmitting frequency synthesis fast switching unit provides local oscillation signals with fast switchable frequency points for the receiving channel unit and the transmitting channel unit through the double phase-locked circuit; the receiving channel unit down-converts the 17.5-20 GHz satellite signals to 4.4GHz +/-250 MHz intermediate frequency signals based on the local oscillation signals; the transmitting channel unit up-converts the baseband intermediate frequency signal of 3.8GHz +/-250 MHz to a transmitting signal of 27.5-30 GHz based on the local oscillation signal.
Optionally, the receiving channel unit includes a first low noise amplifier, a first bandpass filter, a second low noise amplifier, a first low pass filter, a first down-conversion mixer, a second bandpass filter, a third low noise amplifier, a first digital step attenuator, a third bandpass filter, a fourth low noise amplifier, and a second low pass filter, which are connected in sequence.
Optionally, the transmit channel unit includes a fourth band-pass filter, a second digital step attenuator, a third low-pass filter, a first harmonic mixer, a fifth band-pass filter, a fifth low-noise amplifier, a fourth low-pass filter, and a first power amplifier, which are connected in sequence.
The utility model discloses to high flux satellite communication design, adopt Ka working frequency channel, the intermediate frequency channel adopts the C frequency channel, can provide wider bandwidth, obtains the data transmission of bigger capacity, is applicable to high flux satellite communication terminal and uses; the adopted receiving and transmitting double phase-locked loop structure can support the rapid beam switching of the satellite communication terminal in a frequency point ping-pong switching mode between the phase-locked loops and can also support the rapid beam switching of the satellite communication terminal in a frequency point switching mode of the phase-locked loops; compared with a single phase-locked loop, the double phase-locked loop structure can ensure wider local oscillator output frequency, can ensure wider receiving and transmitting frequency range of a radio frequency channel, and enhances the compatibility of the radio frequency channel to terminal products in different frequency bands; the adopted double phase-locked loops and the frequency conversion and gain conditioning circuit share the design, so that the hardware circuit design is effectively simplified, the reliability of a finished product is improved, and the hardware cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is an overall schematic view of a system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a system circuit structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit structure of a receiving channel unit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a circuit structure system of a transmitting channel unit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a circuit structure system of the receiving/transmitting frequency synthesizer fast switching unit provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model can instantly realize the fast switching of two beams, and can ensure the communication continuity of the satellite communication switched by the low orbit satellite by assisting the ephemeris information algorithm, thereby effectively improving the communication interruption problem caused by the switching of single beam; the broadband multi-beam design can be compatible with multi-satellite constellations, the switching between satellites in the same constellation can be realized, the switching between satellites in different constellations can also be realized, and the terminal has wide compatibility; the multi-beam implementation scheme is based on a frequency conversion channel multiplexing form, instantaneous rapid switching of more than two beams can be met only by one set of baseband unit and one set of antenna array surface unit, arbitrary switching of broadband multi-beams can be achieved, cost of the phased array terminal can be greatly reduced, and reliability and compatibility of products are improved.
As shown in fig. 1-2, an embodiment of the present invention provides a multi-beam high-throughput satellite communication terminal rf channel system, which includes a receiving channel unit, a transmitting channel unit, and a receiving-transmitting frequency synthesizer fast switching unit;
and the receiving channel unit is used for down-converting the 17.5-20 GHz satellite signals to 4.4GHz +/-250 MHz intermediate frequency signals, and performing signal filtering, amplification and amplitude gain conditioning.
And the transmitting channel unit is used for up-converting the baseband intermediate frequency signal of 3.8GHz +/-250 MHz to a transmitting signal of 27.5-30 GHz, and performing filtering, amplification and amplitude gain conditioning on the signal.
The receiving and transmitting frequency synthesis fast switching unit provides frequency conversion local oscillation signals of the receiving channel unit and the transmitting channel unit. The local oscillators for providing the receiving and transmitting channel units are respectively provided by two independent phase-locked loops, each phase-locked loop can realize frequency switching, and the local oscillator phase-locked loops belonging to the receiving and transmitting channels are combined by a switch to realize ping-pong type rapid switching of the frequency.
As shown in fig. 3, the receiving channel unit includes a first low noise amplifier, a first band pass filter, a second low noise amplifier, a first low pass filter, a first down-conversion mixer, a second band pass filter, a third low noise amplifier, a first digital step attenuator, a third band pass filter, a fourth low noise amplifier, and a second low pass filter.
The first and second low noise amplifiers function to amplify the received weak satellite signals.
The first band-pass filter and the first low-pass filter have the function of filtering interference signals, image frequency signals and harmonic signals of working signals out of the working frequency band.
The first down-conversion mixer is used for carrying out frequency conversion on a K frequency band (17.5-20 GHz) signal issued by a satellite to obtain an intermediate frequency signal of a C frequency band (4.4 GHz +/-250 MHz).
The second band-pass filter, the third band-pass filter and the second low-pass filter are used for filtering interference signals outside the working frequency band in the C frequency band and improving harmonic signals of the working signals in the C frequency band.
The third low noise amplifier and the fourth low noise amplifier have the function of amplifying the useful signal of the C frequency band after frequency conversion.
The first digital step attenuator is used for conditioning the amplitude of the intermediate frequency signal of the C frequency band, so that the intermediate frequency signal after frequency conversion meets the amplitude requirement of baseband sampling.
As shown in fig. 4, the transmit channel unit includes a fourth band-pass filter, a second digital step attenuator, a third low-pass filter, a first harmonic mixer, a fifth band-pass filter, a fifth low-noise amplifier, a fourth low-pass filter, and a first power amplifier.
The fourth band-pass filter and the third low-pass filter are used for filtering interference signals outside the intermediate frequency working frequency band and harmonic signals of the C-band intermediate frequency signals.
The second digital step attenuator is used for conditioning the amplitude of the intermediate frequency signal in the C frequency band, so that the amplitude of the finally transmitted output signal meets the requirement.
The function of the first harmonic mixer is to up-convert the C-band if signal transmitted by the baseband unit to the Ka-band transmit signal.
The functions of the fifth band-pass filter and the fourth low-pass filter are to filter out interference signals outside the Ka operating frequency band and improve harmonics of the Ka frequency band transmission signals.
The function of the fifth low noise amplifier is to amplify the Ka band transmission signal.
The first power amplifier has the function of carrying out power amplification on the Ka frequency band transmitting signal and outputting the Ka frequency band transmitting signal to the outside.
As shown in fig. 5, the frequency-receiving and frequency-transmitting integrated fast switching unit includes a first constant temperature crystal oscillator, a first power divider, a receiving first integrated VCO phase-locked loop, a receiving second integrated VCO phase-locked loop, a receiving first radio frequency switch, a receiving first low-pass filter, a receiving first driving amplifier, a receiving second low-pass filter, a transmitting first integrated VCO phase-locked loop, a transmitting second integrated VCO phase-locked loop, a transmitting first radio frequency switch, and a transmitting first low-pass filter.
The function of the first constant temperature crystal oscillator of the frequency receiving and transmitting integrated rapid switching unit is to provide a 10MHz reference signal.
The first power divider of the receiving and transmitting frequency synthesis fast switching unit has the function of dividing the 10MHz reference signal into four paths of power, and respectively supplying the four paths of power to the receiving and transmitting local oscillator phase-locked loops.
The function of the receiving and frequency-transmitting integrated fast switching unit for receiving the first integrated VCO phase-locked loop is to perform phase-locking on a 10MHz reference signal and output variable frequency points of 13.35GHz, 14.35GHz and 15.35GHz.
The function of the receiving and frequency-transmitting integrated fast switching unit for receiving the second integrated VCO phase-locked loop is to perform phase-locking on a 10MHz reference signal and output variable frequency points of 13.85GHz and 14.85GHz.
The receiving and transmitting frequency synthesis fast switching unit receives the first radio frequency switch and has the function of receiving one of the signals in the first integrated VCO phase-locked loop and the second integrated VCO phase-locked loop according to the control instruction.
The receiving and transmitting frequency synthesis fast switching unit receives the first low-pass filter and the second low-pass filter, and has the functions of filtering interference signals of output local oscillator signals and improving local oscillator harmonic signals.
The receiving and transmitting frequency synthesis fast switching unit receives the first driving amplifier and has the function of amplifying the power of a useful signal to drive the mixer.
The function of the transmitting and receiving frequency synthesis fast switching unit for transmitting the first integrated VCO phase-locked loop is to perform phase locking on a 10MHz reference signal and output variable frequency points of 15.775GHz, 16.275GHz and 16.775GHz.
The function of the transmitting and receiving frequency synthesis fast switching unit for transmitting the second integrated VCO phase-locked loop is to perform phase locking on a 10MHz reference signal and output variable frequency points of 16.025GHz and 16.525GHz.
The transmitting and receiving frequency synthesis fast switching unit transmits the first radio frequency switch, and the function of the transmitting and receiving frequency synthesis fast switching unit is to transmit one path of signals in the first integrated VCO phase-locked loop and the second integrated VCO phase-locked loop in a gating mode according to a control instruction.
The transmitting and receiving frequency synthesis fast switching unit transmits the first low-pass filter, and has the functions of filtering out interference signals of output local oscillator signals and improving local oscillator harmonic signals. The utility model discloses above-mentioned equipment that adopts is existing equipment, and above-mentioned conventional function can be realized to its existing equipment homoenergetic, simultaneously the utility model discloses the aforesaid is connected and all is adopted current electric wire and signal line to connect, need not carry out too much to be repeated, the utility model discloses protect this system overall structure.
The foregoing illustrates and describes the general principles, features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A receiving-transmitting frequency synthesis fast switching unit is characterized in that:
the receiving and transmitting frequency synthesis fast switching unit is used for phase-locking and outputting a plurality of variable frequency points so as to provide local oscillation signals; the receiving and transmitting frequency synthesis fast switching unit comprises a crystal oscillator circuit, a first phase locking circuit and a second phase locking circuit; the first phase locking circuit and the second phase locking circuit are respectively connected with the crystal oscillator circuit; the crystal oscillator circuit is used for generating a reference signal and performing power division on the reference signal; the first phase-locked circuit and the second phase-locked circuit are respectively used for processing the reference signals after power division to generate a plurality of variable frequency points so as to provide local oscillation signals.
2. The unit of claim 1, wherein:
the crystal oscillator circuit comprises a first constant-temperature crystal oscillator and a first power divider; wherein the first constant temperature crystal oscillator is connected with the first power divider.
3. The unit of claim 2, wherein:
the first phase-locked circuit comprises a plurality of receiving integrated VCO phase-locked loops, a receiving first radio frequency switch, a receiving first low-pass filter, a receiving first driving amplifier and a receiving second low-pass filter;
the receiving integrated VCO phase-locked loops are respectively connected with the first power divider and the receiving first radio frequency switch;
the receiving first radio frequency switch, the receiving first low-pass filter, the receiving first driving amplifier and the receiving second low-pass filter are sequentially connected; and the receiving second low-pass filter provides a local oscillation signal to the external output.
4. The unit of claim 3,
the receiving integrated VCO phase-locked loops are N and are used for outputting M different frequency point signals in a phase-locked manner, wherein 1-N-M.
5. The unit according to claim 4, characterized in that:
the second phase-locked circuit comprises a plurality of transmitting integrated VCO phase-locked loops, a transmitting first radio frequency switch and a transmitting first low-pass filter;
the transmitting integrated VCO phase-locked loops are respectively connected with the first power divider and the transmitting first radio frequency switch;
the transmitting first radio frequency switch is connected with the transmitting first low-pass filter; the transmitting first low-pass filter provides a local oscillator signal to the external output.
6. The unit of claim 5,
the number of the transmitting integrated VCO phase-locked loops is N, and the transmitting integrated VCO phase-locked loops are used for outputting M different frequency point signals in a phase-locked manner, wherein 1-N-M.
7. The unit of claim 6,
the transmitting first radio frequency switch is a 1-out-of-multiple switch and is used for gating one path of signals in the transmitting integrated VCO phase-locked loops to the transmitting first low-pass filter; and/or the presence of a gas in the atmosphere,
the receiving first radio frequency switch is a multiple-to-1 switch and is used for gating one path of signals in the receiving integrated VCO phase-locked loops to the receiving first low-pass filter.
8. A satellite terminal radio frequency channel system, comprising:
a receiving channel unit, a transmitting channel unit and the transceiving frequency synthesis fast switching unit according to any one of claims 1 to 7; the receiving channel unit and the transmitting channel unit are respectively connected with the receiving and transmitting frequency synthesis fast switching unit;
the receiving and transmitting frequency synthesis fast switching unit provides local oscillation signals with fast switchable frequency points for the receiving channel unit and the transmitting channel unit through the double phase-locked circuit of the receiving and transmitting frequency synthesis fast switching unit;
the receiving channel unit down-converts the 17.5-20 GHz satellite signals to 4.4GHz +/-250 MHz intermediate frequency signals based on the local oscillation signals;
the transmitting channel unit up-converts the baseband intermediate frequency signal of 3.8GHz +/-250 MHz to a transmitting signal of 27.5-30 GHz based on the local oscillation signal.
9. The system of claim 8, wherein:
the receiving channel unit comprises a first low noise amplifier, a first band pass filter, a second low noise amplifier, a first low pass filter, a first down-conversion mixer, a second band pass filter, a third low noise amplifier, a first digital step attenuator, a third band pass filter, a fourth low noise amplifier and a second low pass filter which are connected in sequence.
10. The system of claim 8, wherein:
the transmitting channel unit comprises a fourth band-pass filter, a second digital step attenuator, a third low-pass filter, a first harmonic mixer, a fifth band-pass filter, a fifth low-noise amplifier, a fourth low-pass filter and a first power amplifier which are connected in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222455130.7U CN218679062U (en) | 2022-09-16 | 2022-09-16 | Receiving-transmitting frequency synthesis fast switching unit and satellite terminal radio frequency channel system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222455130.7U CN218679062U (en) | 2022-09-16 | 2022-09-16 | Receiving-transmitting frequency synthesis fast switching unit and satellite terminal radio frequency channel system |
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| CN218679062U true CN218679062U (en) | 2023-03-21 |
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| CN202222455130.7U Active CN218679062U (en) | 2022-09-16 | 2022-09-16 | Receiving-transmitting frequency synthesis fast switching unit and satellite terminal radio frequency channel system |
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