CN216531312U - Satellite radio frequency signal forwarding system - Google Patents
Satellite radio frequency signal forwarding system Download PDFInfo
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- CN216531312U CN216531312U CN202122795649.5U CN202122795649U CN216531312U CN 216531312 U CN216531312 U CN 216531312U CN 202122795649 U CN202122795649 U CN 202122795649U CN 216531312 U CN216531312 U CN 216531312U
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Abstract
The utility model provides a satellite radio frequency signal forwarding system. The method comprises the following steps: a transmitting antenna assembly comprising a Ku transmitting antenna and a Ka transmitting antenna; a receiving antenna assembly comprising a Ku receiving antenna and a Ka receiving antenna; the signal forwarding assembly comprises an up-conversion piece and a down-conversion piece, wherein the up-conversion piece comprises a first receiving module, a first crystal oscillator module, a first frequency mixer and a first output module; the down-conversion component comprises a second receiving module, a second crystal module, a second mixer and a second output module. The utility model realizes the propagation of the simulated true satellite communication frequency band signal through the transmitting antenna assembly, the receiving antenna assembly and the information forwarding assembly, and simulates the true channel characteristic and restores the true satellite channel through the middle simulated satellite communication signal propagation.
Description
Technical Field
The utility model relates to the technical field of satellite communication, in particular to a satellite radio frequency signal forwarding system.
Background
In the field of satellite communication, in order to reduce cost and reduce the influence on the service life of a satellite radio-frequency signal forwarding system in daily equipment maintenance, system test and signal monitoring of a satellite earth station, a simulated satellite signal forwarding system is generally used to replace a real satellite radio-frequency signal forwarding system.
At present, most of the existing simulated satellite signal forwarding systems are connected with a transmitter and a receiver through wires at two ends, then channel characteristics are simulated by software, and a wireless channel of a real system link cannot be restored, so that a satellite signal forwarding system which can provide a simulated environment close to practical application and realize comprehensive training is lacked to restore a real satellite channel.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a satellite radio frequency signal forwarding system, which aims to solve the technical problem that a satellite signal repeater capable of providing a real satellite channel is lacked in the related technology.
The utility model provides a satellite radio frequency signal forwarding system. The method comprises the following steps:
a transmitting antenna assembly comprising a Ku transmitting antenna and a Ka transmitting antenna for outputting a radio frequency signal;
a receiving antenna assembly comprising a Ku receiving antenna and a Ka receiving antenna for receiving radio frequency signals;
the signal forwarding assembly comprises an up-conversion piece and a down-conversion piece, wherein the up-conversion piece comprises a first receiving module, a first crystal oscillator module, a first frequency mixer and a first output module, the first receiving module and the first crystal oscillator module are respectively connected with the input end of the first frequency mixer, and the output end of the first frequency mixer is connected with the first output module;
the down-conversion component comprises a second receiving module, a second crystal oscillator module, a second mixer and a second output module, wherein the second receiving module and the second crystal oscillator module are respectively connected with the input end of the second mixer, and the output end of the second mixer is connected with the second output module;
the Ku transmitting antenna and the Ka transmitting antenna are respectively connected with the input end of the first receiving module, and the Ku receiving antenna and the Ka receiving antenna are respectively connected with the output end of the second output module.
Optionally, the first receiving module includes a first attenuator, a first band-pass filter, and a second attenuator, which are connected in sequence, and the second attenuator is connected to an input end of the first mixer;
the first crystal oscillator module comprises a constant-temperature crystal oscillator, a power divider, a first phase-locked loop, a second band-pass filter and a first amplifier which are connected in sequence, and the first amplifier is connected with the input end of the first frequency mixer;
the first output module comprises a third attenuator, a first low-pass filter, a second amplifier, a first numerical control attenuator, a third band-pass filter, a third amplifier and a second low-pass filter which are sequentially connected, and the third attenuator is connected with the output end of the first frequency mixer.
Optionally, the second low-pass filter is connected to the first coupler and the first detector in sequence.
Optionally, the second receiving module includes a fourth band-pass filter and a fourth attenuator, which are connected in sequence, and the fourth attenuator is connected to the input end of the second mixer;
the second crystal oscillator module comprises a constant-temperature crystal oscillator, a power divider, a second phase-locked loop, a fifth band-pass filter and a fourth amplifier which are connected in sequence, and the fourth amplifier is connected with the input end of the second frequency mixer;
the second output module comprises a fifth attenuator, a sixth band-pass filter, a fifth amplifier, a second numerical control attenuator, a third numerical control attenuator, a sixth amplifier and a third low-pass filter which are sequentially connected, and the fifth attenuator is connected with the output end of the second frequency mixer.
Optionally, the third low-pass filter is connected to a second coupler and a second detector in sequence.
Optionally, the signal forwarding component further includes a delay processing module, the first output module of the up-converter is connected to an input end of the delay processing module, and the second receiving module of the down-converter is connected to an output end of the delay processing module.
Optionally, the system further comprises a measurement and control module, wherein the measurement and control module comprises a test unit, and the test unit is respectively connected with the input end of the first receiving module and the output end of the first output module; the test unit is also respectively connected with the input end of the second receiving module and the output end of the second output module.
Optionally, the measurement and control module further includes a beacon forwarding unit, and the beacon forwarding unit is connected to the input end of the first receiving module and the output end of the first output module respectively; the beacon forwarding unit is further connected with the input end of the second receiving module and the output end of the second output module respectively.
Optionally, the measurement and control module further includes a DSP processing unit, and the DSP processing unit is connected to the input end of the second receiving module and the output end of the second output module, respectively.
Compared with the prior art, the utility model has the following beneficial effects:
in the technology of the utility model, the transmission of the real satellite communication frequency band signal is simulated through the transmitting antenna assembly, the receiving antenna assembly and the information forwarding assembly, and the real channel characteristic is simulated through the middle simulated satellite communication signal transmission to restore the real satellite channel.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the up-down frequency conversion principle of the present invention.
Fig. 3 is a schematic structural diagram of a signal forwarding module according to the present invention.
Description of reference numerals: 1. a first attenuator; 2. a first band pass filter; 3. a second attenuator; 4. a first mixer; 5. a constant temperature crystal oscillator; 6. a power divider; 7. a first phase-locked loop; 8. a second band-pass filter; 9. a first amplifier; 10. A third attenuator; 11. a first low-pass filter; 12. a second amplifier; 13. a first digitally controlled attenuator; 14. a third band-pass filter; 15. a third amplifier; 16. a second low-pass filter; 17. a fourth band-pass filter; 18. a fourth attenuator; 19. a second phase-locked loop; 20. a fifth bandpass filter; 21. a fourth amplifier; 22. a fifth attenuator; 23. A sixth band-pass filter; 24. a fifth amplifier; 25. a second digitally controlled attenuator; 26. a third numerical control attenuator; 27. a sixth amplifier; 28. a third low-pass filter; 29. a first coupler; 30. a first detector; 31. a second coupler; 32. A second detector; 33. a second mixer.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and beneficial effects of the present invention more clearly apparent, the technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1, the present invention provides a satellite radio frequency signal repeating system. The method comprises the following steps:
a transmitting antenna assembly comprising a Ku transmitting antenna and a Ka transmitting antenna for outputting a radio frequency signal;
a receiving antenna assembly comprising a Ku receiving antenna and a Ka receiving antenna for receiving radio frequency signals;
the signal forwarding assembly comprises an up-conversion piece and a down-conversion piece, wherein the up-conversion piece comprises a first receiving module, a first crystal oscillator module, a first mixer 4 and a first output module, the first receiving module and the first crystal oscillator module are respectively connected with the input end of the first mixer, and the output end of the first mixer 4 is connected with the first output module;
the down-conversion component comprises a second receiving module, a second crystal module, a second mixer 33 and a second output module, wherein the second receiving module and the second crystal module are respectively connected with the input end of the second mixer, and the output end of the second mixer 33 is connected with the second output module;
the Ku transmitting antenna and the Ka transmitting antenna are respectively connected with the input end of the first receiving module, and the Ku receiving antenna and the Ka receiving antenna are respectively connected with the output end of the second output module.
In this embodiment, the Ku frequency band is 14GHz to 14.5GHz uplink, the Ku downlink is 12.25GHz to 12.75GHz, and the intermediate frequency output frequency: 950-1450 MHz; the Ka frequency band is 29.4 GHz-31 GHz in uplink and 19.6 GHz-21.2 GHz in Ka downlink; the Ku transmitting antenna and the Ku receiving antenna are provided with a standard pyramid horn antenna, the pyramid horn antenna is fed by a TE10 mode of a waveguide, and an opened metal pyramid horn is excited to form radiation. The pyramid horn antenna has the advantages that under the condition that the gain is smaller than 22dB, the horn antenna has E-plane directional diagram wave beam widths and H-plane directional diagram wave beam widths which are simple in structure, can be controlled respectively, and is stable and reliable in performance. The satellite radio-frequency signal forwarding system can be integrated on a circuit board of 20cm multiplied by 20cm, but not limited to, and can also comprise a power supply assembly, and the weight of the system is about 5 kilograms after the power supply assembly is contained, so that the miniaturization is realized, the system is convenient to carry on platforms such as iron towers or unmanned planes, and the training is convenient;
the signal forwarding component is used for receiving the signal input by the transmitting antenna component, processing the signal and outputting the processed signal to the receiving antenna component, and restoring a wireless channel of a real system link by processing the input signal through low-pass, amplification, filtering and the like.
Optionally, the first receiving module includes a first attenuator 1, a first bandpass filter 2, and a second attenuator 3, which are connected in sequence, where the second attenuator 3 is connected to an input end of the first mixer 4;
the first crystal oscillator module comprises a constant-temperature crystal oscillator 5, a power divider 6, a first phase-locked loop 7, a second band-pass filter 8 and a first amplifier 9 which are connected in sequence, and the first amplifier 9 is connected with the input end of the first frequency mixer 4;
the first output module comprises a third attenuator 10, a first low-pass filter 11, a second amplifier 12, a first numerical control attenuator 13, a third band-pass filter 14, a third amplifier 15 and a second low-pass filter 16 which are connected in sequence, and the third attenuator 10 is connected with the output end of the first mixer 4.
Referring to fig. 2, in this embodiment, an input signal of 14GHz to 14.5GHz in the Ku frequency band sequentially passes through the first attenuator 1 and the first bandpass filter 2 to filter out an out-of-band spurious and an image signal, and then enters the first mixer 4 through the second attenuator 3, and is mixed with a local oscillator signal of 13.05GHz (the local oscillator signal generated by the 100HZ constant temperature crystal oscillator 5 is generated after being processed by the power divider 6, the first phase-locked loop 7 of 13.05GHz, the second bandpass filter 8, and the first amplifier 9, and the device of the first phase-locked loop 7 of 13.05GHz is HMC807LP6CE), and then the intermediate frequency output signal of 950 to 1450MHz is generated after low pass, amplification, and amplitude control. Wherein the first digitally controlled attenuator 13 steps by 0.25db and has a dynamics of 31.75 db.
Optionally, the second low-pass filter is connected in turn to a first coupler 29 and a first detector 30.
In this embodiment, the first coupler 29 and the first detector 30 are sequentially used for coupling signals and then converting the signals into direct-current voltage signals through the first detector.
Optionally, the second receiving module includes a fourth bandpass filter 17 and a fourth attenuator 18 connected in sequence, where the fourth attenuator 18 is connected to the input end of the second mixer 33;
the second crystal oscillator module comprises a constant temperature crystal oscillator 5, a power divider 6, a second phase-locked loop 19, a fifth bandpass filter 20 and a fourth amplifier 21 which are connected in sequence, and the fourth amplifier 21 is connected with the input end of the second mixer 33;
the second output module comprises a fifth attenuator 22, a sixth band-pass filter 23, a fifth amplifier 24, a second digital controlled attenuator 25, a third digital controlled attenuator 26, a sixth amplifier 27 and a third low-pass filter 28 which are connected in sequence, and the fifth attenuator 22 is connected with the output end of the second mixer 33.
Referring to fig. 2, in this embodiment, after filtering out an out-of-band spurious signal by using a fourth band-pass filter 17 and attenuating by using a fourth attenuator 18, an intermediate frequency input signal of 950 to 1450MHz enters a second mixer 33 to be mixed with a local oscillator signal of 11.3GHz (the local oscillator signal generated by the 100HZ constant temperature crystal oscillator 5 is processed by a power divider 6, a second phase-locked loop 19 of 11.3GHz, a fifth band-pass filter 20, and a fourth amplifier 21 and then generated, a device selected by the second phase-locked loop 19 of 11.3GHz is HMC783LP6CE), and a signal of 12.25 to 12.75GHz is output after amplification, amplitude control, and a low-pass filter, so that simulation of a real satellite channel is achieved;
the selected model of the first numerical control attenuator 13 and the second numerical control attenuator 25 is HMC1119, the two-stage numerical control attenuators are connected in series and are practical, the step-by-step and dynamic 63.5db amplification control can be realized, and the frequency of a down-conversion channel image signal is LO-2IF (local oscillator-frequency) which is 12.1 GHz; and inhibiting the image signal through a 14-14.5GHz band-pass filter to ensure that the index meets the requirement.
Optionally, the third low-pass filter 28 is connected with a second coupler 31 and a second detector 32 in sequence.
In this embodiment, the functions of the second coupler 31 and the second detector 32 are the same as those described above, and are not described herein again.
Optionally, the signal forwarding component further includes a delay processing module, the first output module of the up-converter is connected to an input end of the delay processing module, and the second receiving module of the down-converter is connected to an output end of the delay processing module.
In the embodiment, because the satellite communication process has a large transmission delay, and because the antenna elevation angles of the earth stations are different, the propagation delay from one earth station to another earth station through the satellite is 250-300 ms regardless of the ground distance between the two earth stations (separated by one street or by tens of thousands of kilometers). Generally, 270ms is available, and 540ms is needed for double-hop communication, so that after a signal interacted between a terminal (such as ground equipment like a satellite simulator) and a satellite radio-frequency signal forwarding system is received by a delay processing module, signal data is cached, and when the caching duration of the signal data reaches a set delay duration, the signal data is sent out. The delay time is the number of sampling points set based on the distance between the terminal and the satellite radio frequency signal forwarding system and the sampling frequency of the terminal.
Optionally, the system further comprises a measurement and control module, wherein the measurement and control module comprises a test unit, and the test unit is respectively connected with the input end of the first receiving module and the output end of the first output module; the test unit is also respectively connected with the input end of the second receiving module and the output end of the second output module.
In this embodiment, the measurement and control module is configured to implement each infinite data transmission between the satellite radio frequency signal forwarding system and the ground receiving device. Including but not limited to, detecting the antenna states of the transmitting antenna assembly and the receiving antenna assembly, including the orientation, elevation, etc. of the antenna, the parameters and gain adjustments of the up-conversion element and the down-conversion element, and adding test equipment and authority adjustment, etc.
Optionally, the measurement and control module further includes a beacon forwarding unit, and the beacon forwarding unit is connected to the input end of the first receiving module and the output end of the first output module respectively; the beacon forwarding unit is further connected with the input end of the second receiving module and the output end of the second output module respectively.
In this embodiment, the beacon forwarding module is configured to automatically track the output radio frequency signal and the received radio frequency signal, and perform automatic uplink power control on a Ku band signal. The beacon signal does not contain a single carrier of modulation information, and the frequency of the beacon signal is set at the lower end of the frequency resource in order to minimize the influence on the communication signal.
Optionally, the measurement and control module further includes a DSP processing unit, and the DSP processing unit is connected to the input end of the second receiving module and the output end of the second output module, respectively.
In this embodiment, the DSP processing unit processes the intermediate frequency signal output by the down conversion component, so as to achieve an effect similar to a transmission link through a satellite communication channel. In addition, because the DSP can not process the broadband signal, the hardware adopts the structural system and algorithm based on the FPGA, and the hardware adopts the structural system and algorithm based on the FPGA. The satellite channel simulator can simulate maximum 12 multipath components on each channel, and is used for simulating Rayleigh and Rician fading environments. And each channel may individually or simultaneously simulate rayleigh fading and rice fading. Meanwhile, the simulator can be upgraded, non-correlated additive white Gaussian noise is superposed on a link and used for testing the Eb/No bit error rate, the non-correlated additive white Gaussian noise is generated by an additive signal generator, an external noise signal is simulated, the level of introduced noise is adjustable, the carrier-to-noise ratio is reduced from 10 to 4.5, and the real satellite channel is further simulated by stepping 1 dB.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (9)
1. A satellite radio frequency signal repeating system, comprising:
a transmitting antenna assembly comprising a Ku transmitting antenna and a Ka transmitting antenna for outputting a radio frequency signal;
a receiving antenna assembly comprising a Ku receiving antenna and a Ka receiving antenna for receiving radio frequency signals;
the signal forwarding assembly comprises an up-conversion piece and a down-conversion piece, wherein the up-conversion piece comprises a first receiving module, a first crystal oscillator module, a first frequency mixer and a first output module, the first receiving module and the first crystal oscillator module are respectively connected with the input end of the first frequency mixer, and the output end of the first frequency mixer is connected with the first output module;
the down conversion part comprises a second receiving module, a second crystal oscillator module, a second mixer and a second output module, wherein the second receiving module and the second crystal oscillator module are respectively connected with the input end of the second mixer, and the output end of the second mixer is connected with the second output module;
the Ku transmitting antenna and the Ka transmitting antenna are respectively connected with the input end of the first receiving module, and the Ku receiving antenna and the Ka receiving antenna are respectively connected with the output end of the second output module.
2. The satellite radio frequency signal forwarding system of claim 1, wherein the first receiving module comprises a first attenuator, a first band-pass filter and a second attenuator connected in sequence, the second attenuator being connected to an input of the first mixer;
the first crystal oscillator module comprises a constant-temperature crystal oscillator, a power divider, a first phase-locked loop, a second band-pass filter and a first amplifier which are connected in sequence, and the first amplifier is connected with the input end of the first frequency mixer;
the first output module comprises a third attenuator, a first low-pass filter, a second amplifier, a first numerical control attenuator, a third band-pass filter, a third amplifier and a second low-pass filter which are sequentially connected, and the third attenuator is connected with the output end of the first frequency mixer.
3. The satellite radio frequency signal repeating system of claim 2, wherein the second low pass filter is connected to the first coupler and the first detector in sequence.
4. The satellite radio frequency signal repeating system of claim 1, wherein the second receiving module comprises a fourth band-pass filter and a fourth attenuator connected in series, the fourth attenuator being connected to an input of the second mixer;
the second crystal oscillator module comprises a constant-temperature crystal oscillator, a power divider, a second phase-locked loop, a fifth band-pass filter and a fourth amplifier which are connected in sequence, and the fourth amplifier is connected with the input end of the second frequency mixer;
the second output module comprises a fifth attenuator, a sixth band-pass filter, a fifth amplifier, a second numerical control attenuator, a third numerical control attenuator, a sixth amplifier and a third low-pass filter which are sequentially connected, and the fifth attenuator is connected with the output end of the second frequency mixer.
5. The satellite radio frequency signal repeating system of claim 4, wherein the third low pass filter is connected to a second coupler and a second detector in sequence.
6. The satellite radio frequency signal repeating system of claim 1, wherein the signal repeating assembly further comprises a delay processing module, the first output module of the up-converting element is connected to an input of the delay processing module, and the second receiving module of the down-converting element is connected to an output of the delay processing module.
7. The satellite radio frequency signal forwarding system of claim 1, further comprising a measurement and control module, wherein the measurement and control module comprises a test unit, and the test unit is respectively connected to the input end of the first receiving module and the output end of the first output module; the test unit is also respectively connected with the input end of the second receiving module and the output end of the second output module.
8. The satellite radio frequency signal forwarding system of claim 7, wherein the measurement and control module further comprises a beacon forwarding unit, and the beacon forwarding unit is respectively connected to the input end of the first receiving module and the output end of the first output module; the beacon forwarding unit is further connected with the input end of the second receiving module and the output end of the second output module respectively.
9. The satellite rf signal forwarding system of claim 7, wherein the measurement and control module further comprises a DSP processing unit, and the DSP processing unit is respectively connected to the input end of the second receiving module and the output end of the second output module.
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| CN202122795649.5U CN216531312U (en) | 2021-11-15 | 2021-11-15 | Satellite radio frequency signal forwarding system |
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