CN113411149B - Low-orbit satellite mobile communication ground experiment system - Google Patents
Low-orbit satellite mobile communication ground experiment system Download PDFInfo
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- CN113411149B CN113411149B CN202110548771.4A CN202110548771A CN113411149B CN 113411149 B CN113411149 B CN 113411149B CN 202110548771 A CN202110548771 A CN 202110548771A CN 113411149 B CN113411149 B CN 113411149B
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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Abstract
The invention discloses a low-orbit satellite mobile communication ground experiment system which comprises a software platform and a hardware platform, wherein the software platform is responsible for satellite channel real-time parameter calculation, data analysis and visual expression, and the hardware platform comprises a sending signal processing module, a beam user direction simulation module, a satellite channel simulation module and a digital-to-analog conversion module. The transmitting signal processing module is used for processing baseband transmitting signals, the beam user direction simulation module is used for simulating the spatial direction of an antenna domain and a beam domain user channel, the satellite channel simulation module is used for simulating the channel long time delay, large fading, multipath characteristics and large Doppler frequency offset existing in a low-orbit satellite-ground channel, and the digital-to-analog conversion module converts user receiving data into analog intermediate frequency signals for output. The invention supports two scene simulation of an antenna mode and a beam mode, and simultaneously the beam mode combines satellite beam forming and a user channel space direction so as to realize low complexity and greatly reduce the resource consumption of the system.
Description
Technical Field
The invention belongs to the field of satellite mobile communication, and relates to a low-orbit satellite mobile communication ground experiment system.
Background
As an important component of terrestrial fifth Generation (5G, 5th Generation) mobile communication technology, the broadband low-earth satellite communication system is becoming one of the research hotspots in the field of satellite communication. Compared with medium and high orbit satellites, the low orbit satellite has the advantages of light weight, small volume, low cost and the like, and has lower transmission delay, and tens or hundreds of low orbit satellites can also cooperate to form a constellation system to provide transmission coverage in the global range. But at the same time, because the low-earth satellite communication link has significant difference from the ground communication environment, such as large doppler shift caused by high-speed movement of the satellite relative to the ground, many challenges are brought to the air interface signal processing of the ground station.
With the demand of users for satellite communication rate becoming higher and higher, the active frequency band resources are becoming saturated increasingly, and how to adopt a more efficient data transmission scheme is the current research focus. Compared with a single-beam transmission scheme, the multi-beam transmission technology can simultaneously generate a plurality of beams to cover a target area, frequency reuse can be realized among the multiple beams, and the throughput of a communication system is greatly improved. In addition, satellite-borne multi-beam antenna technology has been applied more and more, such as the Iridium system is equipped with 3 pairs of antennas, each of which has 16 spot beams.
Due to the special environmental conditions of satellite operation, if an external field test method is adopted to rent an actual satellite link to verify a related algorithm, the problems of high cost, long test time, high possibility of being affected by severe weather and the like can occur. In order to reduce the simulation cost and the implementation complexity, a ground verification simulation system capable of truly simulating the satellite load and the satellite-ground channel characteristics is required. However, the multi-beam broadband low-earth orbit satellite system is generally implemented with high complexity, and it is a common practice to implement the multi-beam load simulator and the satellite user channel simulator on two hardware platforms, respectively, so that a large amount of hardware resources and computation time are consumed.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a low-orbit satellite mobile communication ground experimental system with low complexity, high integration level and flexible architecture, which is used for truly simulating the multi-beam broadband low-orbit satellite communication load and the satellite ground wireless channel characteristics and further can be used for channel capacity evaluation and related algorithm research of a low-orbit satellite system.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
a low-orbit satellite mobile communication ground experiment system is used for truly simulating multi-beam broadband low-orbit satellite communication load and satellite ground wireless channel characteristics, and comprises a software platform and a hardware platform; the software platform is responsible for generating satellite channel real-time parameters needed in the operation process of the hardware platform through satellite system parameters input by a user, sending the satellite channel real-time parameters to the hardware platform, and receiving the operation result of the hardware platform to perform data analysis and visual expression; the hardware platform comprises a sending signal processing module, a beam user direction simulation module, a satellite channel simulation module and a digital-to-analog conversion module;
the input signal of the sending signal processing module is a multi-channel signal to be sent on each wave beam, and the output signal is a digital baseband IQ signal of the corresponding wave beam and is input to the wave beam user direction analog module;
the beam user direction simulation module receives and processes digital baseband IQ signals of corresponding beams, two different working modes can be selected, including an antenna test mode and a beam direct-connection mode, channel equivalent coefficients of an antenna domain and a beam domain are simulated respectively, and output signals obtained after processing are corresponding user receiving signals;
the input data of the satellite channel simulation module is the output signal of the beam user direction simulation module, and the channel simulation module is used for simulating the properties of long channel delay, large fading, multipath characteristics and large Doppler frequency offset existing in a low-orbit satellite-ground channel and outputting the processed signal to the digital-to-analog conversion module;
the input signal of the digital-to-analog conversion module is the output data of the satellite channel analog module, and the analog intermediate frequency receiving signal of each user is obtained through digital-to-analog conversion and is output.
Further: the satellite system parameters input by the user comprise satellite orbit altitude, satellite orbit inclination, elevation point longitude, carrier frequency, satellite minimum working elevation, latitude and longitude coordinates of the position of each user, altitude of each user and total simulation duration; the satellite channel real-time parameters required in the operation process of the hardware platform comprise a user space direction matrix, a beam weight matrix, channel transmission delay, Doppler frequency offset and a multipath channel coefficient; the operation result of the hardware platform comprises the real-time transmission delay of the channel detected by each user and the loaded real-time Doppler frequency shift.
Further: the sending signal processing module consists of NbA plurality of parallel transmit baseband signal processing units, wherein NbThe number of downlink beams of the simulation system; each transmitting baseband signal processing unit receives corresponding wave beam transmitting data and transmits the data according to time frequency resourcesInserting downlink synchronous sequence and broadcast signal sequence according to source requirement, and carrying out orthogonal frequency division multiplexing modulation to obtain digital baseband IQ signal p to be transmitted in downlinkk(t),1≤k≤NbAnd outputting the data.
Further: the beam user direction simulation module comprises a channel equivalent coefficient calculation unit and a user channel space direction simulation unit; the whole module has two working modes, namely an antenna test mode and a beam direct-connection mode;
the channel equivalent coefficient calculation unit is used for calculating the channel equivalent coefficient of an antenna domain or a beam domain, selecting different calculation processes according to the current module working mode, and outputting coefficient data of a corresponding mode to the user channel space direction simulation unit;
and the user channel space direction simulation unit selects different channel equivalent coefficients according to the current module working mode to multiply the corresponding domain signals to be sent, so as to obtain the corresponding user receiving signals.
Further: the channel equivalent coefficient calculation unit comprises a user direction vector generation subunit, an antenna type selector subunit and a user beam domain channel space direction weight calculation subunit;
the user direction vector generating subunit calculates the direction vector of each user according to the input position information of each user, and then sends the user direction vector to different modules according to the working mode of the current system; if the system is in the antenna test mode, the system is sent to a user channel space direction simulation unit; if the system is in the beam through mode, the system is sent to a user beam domain channel space direction weight calculation subunit;
the antenna type selector subunit selects beam gain data corresponding to different transmitting antennas according to the working mode of the current system and transmits the beam gain data to the user beam domain channel space direction weight calculation subunit; if the system simulates phased array antenna transmission, selecting a beam weight antenna direction gain vector; if the system simulates multi-beam antenna transmission, selecting a beam direction gain vector;
the user beam domain channel space direction weight value operator unit is used for calculating a beam domain equivalent channel matrix of the system working under the beam direct-through mode and sending the calculation result to the user channel space direction simulation unit; if the system simulates phased array antenna transmission, multiplying the user direction vector by the antenna direction gain coefficient of the beam weight; if the system simulates the transmission of a multi-beam antenna, the channel equivalent coefficient of the corresponding user beam domain is found by looking up a table.
Further: the user channel space direction simulation unit comprises a mode selection unit and a beam/antenna user direction simulation unit;
the mode selection unit is used for controlling the working modes of the current system, and comprises an antenna test mode and a beam through mode; if the system is in an antenna test mode, transmitting an antenna domain to send a signal to a beam/antenna user direction simulation unit; if the system is in a beam through mode, transmitting a beam domain to send a signal to a beam/antenna user direction simulation unit;
the beam/antenna user direction simulation unit selects different channel equivalent coefficients to multiply with corresponding domain signals to be sent according to the current module working mode; if the system is in an antenna test mode, multiplying the user direction vector by the signal sent by the antenna domain; and if the system is in the beam through mode, multiplying the beam domain equivalent channel matrix by the beam domain transmission signal.
Further: the satellite channel simulation module comprises NrA parallel multipath delay-Doppler analog unit, wherein NrThe number of receiving users simulated for the system; the multi-path time delay Doppler simulation unit comprises a Doppler frequency offset simulation subunit, a dynamic long time delay simulation subunit and a multi-path simulation subunit;
the Doppler frequency offset simulation subunit is used for simulating the large Doppler frequency offset generated by the high-speed movement of the satellite in the low-orbit satellite-ground channel and outputting the processed signal to the dynamic long-time delay simulation subunit;
the dynamic long-time-delay simulation subunit is used for simulating the dynamic long time delay caused by the dynamic long distance between the satellite and the ground station in the low-orbit satellite-ground channel in the motion process and outputting the processed signal to the multi-path simulation subunit;
the multipath simulation subunit is used for simulating multipath signal transmission caused by a ground complex environment in the low-orbit satellite-ground channel and outputting the processed signal to the digital-to-analog conversion module.
The ground experiment system for low earth orbit satellite mobile communication of claim 1, wherein: the digital-to-analog conversion module comprises NrAnd the DAC module is used for respectively carrying out digital-to-analog conversion on the user receiving data of each channel and outputting the analog intermediate frequency signals received by the users.
Has the advantages that: the invention discloses a low-orbit satellite mobile communication ground experimental system, which has the following beneficial effects compared with the prior art:
1) the system can support two different scene simulations including an antenna mode and a beam mode, and can select two modes of simulation phased array antenna transmission and multi-beam antenna transmission in the beam mode, thereby remarkably improving the multi-scene verification capability of the system.
2) The system has low hardware realization complexity, and because the change rate of the beam domain equivalent channel matrix is usually far lower than the signal transmission rate, the satellite beam forming part and the user channel space direction simulation part are combined under the beam mode so as to directly calculate the equivalent beam domain channel matrix, thereby greatly reducing the hardware realization complexity of the multi-beam broadband low-orbit satellite system and improving the utilization efficiency of hardware resources.
3) The system has flexible design architecture and strong expandability. The accurate simulation of the satellite channel characteristics of various different orbit parameters can be realized through software configuration, and the expansion of the number of system simulation users and the number of beams can be easily realized through a hardware architecture.
4) In the operation process of the system, workers can adjust system simulation parameters in real time through a human-computer interaction interface, and simultaneously monitor the attitude and orbit states and operation parameters of the simulated satellite in real time, so that the workers can analyze the performance of the simulated satellite channel in time.
Drawings
Fig. 1 is a system architecture diagram of a low earth orbit satellite mobile communication ground experiment system according to the present invention.
Fig. 2 is a frame composition diagram of the channel equivalent coefficient calculation unit.
Fig. 3 is a block diagram of a user channel spatial direction modeling unit.
Fig. 4 is a block diagram of a multipath delay-doppler simulation unit.
Detailed Description
The invention is further described with reference to the following figures and specific examples, which are intended to illustrate the invention and are not intended to limit the scope of the invention.
With reference to fig. 1, the embodiment of the invention discloses a low earth orbit satellite mobile communication ground experiment system, which is composed of a software platform and a hardware platform, wherein the software platform is responsible for satellite channel real-time parameter calculation, data analysis and visual expression, and the hardware platform comprises a sending signal processing module, a beam user direction simulation module, a satellite channel simulation module and a digital-to-analog conversion module. The input signal of the hardware platform is N transmitted in a corresponding beambParallel baseband signals of NbThe number of downlink beams of the simulation system. The method comprises the steps that a sending baseband signal is firstly input into a sending signal processing module, an output signal of the sending signal processing module is input into a beam user direction simulation module, an output signal of the beam user direction simulation module is input into a satellite channel simulation module, an output signal of the satellite channel simulation module is input into a digital-to-analog conversion module, and an output signal of the digital-to-analog conversion module is NrAnalog intermediate frequency reception signals of individual beam users.
Specifically, the software platform is responsible for generating satellite channel real-time parameters needed in the hardware platform operation process through satellite system parameters input by a user, sending the satellite channel real-time parameters to the hardware platform, and receiving the operation result of the hardware platform to perform data analysis and visual expression. The satellite system parameters input by the user comprise satellite orbit altitude, satellite orbit inclination, elevation point longitude, carrier frequency, satellite minimum working elevation, latitude and longitude coordinates of the position of each user, altitude of each user and total simulation duration; the satellite channel real-time parameters required in the operation process of the hardware platform comprise a user space direction matrix, a beam weight matrix, channel transmission delay, Doppler frequency offset and a multipath channel coefficient; the operation result of the hardware platform comprises the real-time transmission delay of the channel detected by each user and the loaded real-time Doppler frequency shift; the visual expression comprises the steps that a software interface displays user input parameters and hardware platform output parameters through a control, and simultaneously video display is carried out on the real-time running state of the satellite relative to the earth and the beam coverage area.
Said N isbThe channel parallel baseband data signals are mapped according to data signal time frequency resources required by a 5G novel wireless air interface technology (NR, New Radio) protocol, and the data signals are generated in a QPSK modulation mode.
The sending signal processing module consists of NbEach transmitting baseband signal processing unit receives corresponding wave beam transmitting data, inserts a downlink synchronous sequence and a broadcast signal sequence with a period of 10ms according to the 5G NR time Frequency resource requirement, and carries out Orthogonal Frequency Division Multiplexing (OFDM) modulation to obtain a digital baseband IQ signal p to be transmitted in a downlink mannerk(t),1≤k≤NbAnd outputting the data.
The beam user direction simulation module comprises a channel equivalent coefficient calculation unit and a user channel space direction simulation unit. The whole module has two working modes, namely an antenna test mode and a beam direct-connection mode;
the channel equivalent coefficient calculation unit is used for calculating the channel equivalent coefficient of an antenna domain or a beam domain, selecting different calculation processes according to the current module working mode, and outputting coefficient data of the corresponding mode to the user channel space direction simulation unit.
And the user channel space direction simulation unit selects different channel equivalent coefficients according to the current module working mode to multiply the channel equivalent coefficients with corresponding domain signals to be sent so as to obtain user receiving signals of corresponding beams.
Further, with reference to fig. 2, the channel equivalent coefficient calculating unit includes a user direction vector generating subunit, an antenna type selector subunit, and a user beam domain channel space direction weight calculating subunit;
the user direction vector generating subunit calculates the direction vector of each user according to the input position information of each user, and then sends the user direction vector matrix to different modules according to the working mode of the current system. If the system is in the antenna test mode, the system is sent to a user channel space direction simulation unit; if the system is in the beam through mode, the system is sent to a user beam domain channel space direction weight calculation subunit;
specifically, the calculation result of the user direction matrix may be represented as:
where f is the carrier frequency, NtIndicating the number of satellite transmitting antennas, NrIndicating the number of receiver users, tau, simulated in the systemjiWhich represents the time delay of the transmission signal of the ith transmit antenna to the jth user with respect to the reference position.
And the antenna type selector subunit selects beam gain data corresponding to different transmitting antennas according to the working mode of the current system and transmits the beam gain data to the user beam domain channel space direction weight calculation subunit. If the system simulates phased array antenna transmission, selecting a beam weight antenna direction gain matrix; if the system simulates multi-beam antenna transmission, then the beam direction gain vector is selected.
Specifically, the beam weight antenna directional gain matrix may be represented as:
wherein wk,iIs the weight of antenna i to beam k andis a plurality of numbers.
And the user beam domain channel space direction weight value operator unit is used for calculating a beam domain equivalent channel matrix of the system working under the beam through mode and sending the calculation result to the user channel space direction simulation unit. If the system simulates phased array antenna transmission, multiplying the user direction vector by the antenna direction gain coefficient of the beam weight, and expressing the obtained beam domain equivalent channel matrix as B as AW; if the system simulates the transmission of a multi-beam antenna, the channel equivalent coefficient of the corresponding user beam domain is found by looking up a table.
Further, referring to fig. 3, the user channel spatial direction simulation unit includes a mode selection unit and a beam/antenna user direction simulation unit.
The mode selection unit is used for controlling the working modes of the current system, including an antenna test mode and a beam through mode. If the system is in the antenna test mode, transmitting the antenna domain sending signal
A beam/antenna user direction analog unit; if the system is in the beam through mode, transmitting the beam domain sending signal
A beam/antenna user direction analog unit;
and the beam/antenna user direction simulation unit selects different channel equivalent coefficients to multiply with corresponding domain signals to be sent according to the current module working mode. If the system is in an antenna test mode, multiplying a user direction vector by an antenna domain sending signal to obtain an antenna domain receiving signal X (t) ═ AS (t); if the system is in the beam-through mode, the beam domain equivalent channel matrix is multiplied by the beam domain transmission signal to obtain a beam domain reception signal x (t) ═ awp (t).
Further, in conjunction with fig. 4, the satellite channel simulation module includes NrAnd a parallel multipath time delay Doppler analog unit. The multipath time delay Doppler analog unit comprises a Doppler frequency offset moduleThe simulation unit comprises a simulation subunit, a dynamic long-delay simulation subunit and a multipath simulation subunit.
The Doppler frequency offset simulation subunit is used for simulating the large Doppler frequency offset generated by the high-speed movement of the satellite in the low-orbit satellite-ground channel, determining the Doppler frequency offset existing in the channel according to the current running speed of the satellite, converting the Doppler frequency offset into a corresponding phase rotation angle to perform phase rotation on the input signal, and outputting the processed signal to the dynamic long-delay simulation subunit.
The dynamic long-time-delay simulation subunit is used for simulating the dynamic long time delay caused by the long distance between the satellite and the ground station in the low-orbit satellite-ground channel and outputting the processed signal to the multi-path simulation subunit. For the dynamic long delay simulation method, reference may be made to "a dynamic delay and doppler simulation method for low earth orbit satellite communication" disclosed in patent CN112311449A, which is not described herein again.
The multipath simulation subunit is used for simulating multipath signal transmission caused by a ground complex environment in the low-orbit satellite-ground channel, firstly determining the multipath quantity, time delay and coefficient of each path, calculating through a filter structure and outputting a result to the received signal processing module.
Further, the received signal processing module comprises NrAnd the parallel DAC module is used for respectively carrying out digital-to-analog conversion on the user receiving data of each channel and outputting the user receiving analog intermediate frequency signals.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A low orbit satellite mobile communication ground experimental system is used for truly simulating the communication load of a multi-beam broadband low orbit satellite and the ground wireless channel characteristics of the satellite, and is characterized in that: the system comprises a software platform and a hardware platform; the software platform is responsible for generating satellite channel real-time parameters needed in the operation process of the hardware platform through satellite system parameters input by a user, sending the satellite channel real-time parameters to the hardware platform, and receiving the operation result of the hardware platform to perform data analysis and visual expression; the hardware platform comprises a sending signal processing module, a beam user direction simulation module, a satellite channel simulation module and a digital-to-analog conversion module;
the input signal of the sending signal processing module is a multi-channel signal to be sent on each wave beam, and the output signal is a digital baseband IQ signal of the corresponding wave beam and is input to the wave beam user direction analog module;
the beam user direction simulation module receives and processes digital baseband IQ signals of corresponding beams, two different working modes can be selected, including an antenna test mode and a beam direct-connection mode, channel equivalent coefficients of an antenna domain and a beam domain are simulated respectively, and output signals obtained after processing are corresponding user receiving signals;
the input data of the satellite channel simulation module is the output signal of the beam user direction simulation module, and the channel simulation module is used for simulating the properties of long channel delay, large fading, multipath characteristics and large Doppler frequency offset existing in a low-orbit satellite-ground channel and outputting the processed signal to the digital-to-analog conversion module;
the input signal of the digital-to-analog conversion module is the output data of the satellite channel analog module, and the analog intermediate frequency receiving signal of each user is obtained through digital-to-analog conversion and is output.
2. The ground experiment system for low earth orbit satellite mobile communication of claim 1, wherein: the satellite system parameters input by the user comprise satellite orbit altitude, satellite orbit inclination, elevation point longitude, carrier frequency, satellite minimum working elevation, latitude and longitude coordinates of the position of each user, altitude of each user and total simulation duration; the satellite channel real-time parameters required in the operation process of the hardware platform comprise a user space direction matrix, a beam weight matrix, channel transmission delay, Doppler frequency offset and a multipath channel coefficient; the operation result of the hardware platform comprises the real-time transmission delay of the channel detected by each user and the loaded real-time Doppler frequency shift.
3. The ground experiment system for low earth orbit satellite mobile communication of claim 1, wherein: the sending signal processing module consists of NbA plurality of parallel transmit baseband signal processing units, wherein NbThe number of downlink beams of the simulation system; each transmitting baseband signal processing unit receives corresponding beam transmitting data, inserts a downlink synchronous sequence and a broadcast signal sequence according to time-frequency resource requirements and carries out orthogonal frequency division multiplexing modulation to obtain a digital baseband IQ signal p to be transmitted in a downlink mannerk(t),1≤k≤NbAnd outputting the data.
4. The ground experiment system for low earth orbit satellite mobile communication of claim 1, wherein: the beam user direction simulation module comprises a channel equivalent coefficient calculation unit and a user channel space direction simulation unit; the whole module has two working modes, namely an antenna test mode and a beam direct-connection mode;
the channel equivalent coefficient calculation unit is used for calculating the channel equivalent coefficient of an antenna domain or a beam domain, selecting different calculation processes according to the current module working mode, and outputting coefficient data of a corresponding mode to the user channel space direction simulation unit;
and the user channel space direction simulation unit selects different channel equivalent coefficients according to the current module working mode to multiply the corresponding domain signals to be sent, so as to obtain the corresponding user receiving signals.
5. The ground experiment system for low earth orbit satellite mobile communication of claim 4, wherein: the channel equivalent coefficient calculation unit comprises a user direction vector generation subunit, an antenna type selector subunit and a user beam domain channel space direction weight calculation subunit;
the user direction vector generating subunit calculates the direction vector of each user according to the input position information of each user, and then sends the user direction vector to different modules according to the working mode of the current system; if the system is in the antenna test mode, the system is sent to a user channel space direction simulation unit; if the system is in the beam through mode, the system is sent to a user beam domain channel space direction weight calculation subunit;
the antenna type selector subunit selects beam gain data corresponding to different transmitting antennas according to the working mode of the current system and transmits the beam gain data to the user beam domain channel space direction weight calculation subunit; if the system simulates phased array antenna transmission, selecting a beam weight antenna direction gain vector; if the system simulates multi-beam antenna transmission, selecting a beam direction gain vector;
the user beam domain channel space direction weight value operator unit is used for calculating a beam domain equivalent channel matrix of the system working under the beam direct-through mode and sending the calculation result to the user channel space direction simulation unit; if the system simulates phased array antenna transmission, multiplying the user direction vector by the antenna direction gain coefficient of the beam weight; if the system simulates the transmission of a multi-beam antenna, the channel equivalent coefficient of the corresponding user beam domain is found by looking up a table.
6. The ground experiment system for low earth orbit satellite mobile communication of claim 4, wherein: the user channel space direction simulation unit comprises a mode selection unit and a beam/antenna user direction simulation unit;
the mode selection unit is used for controlling the working modes of the current system, and comprises an antenna test mode and a beam through mode; if the system is in an antenna test mode, transmitting an antenna domain to send a signal to a beam/antenna user direction simulation unit; if the system is in a beam through mode, transmitting a beam domain to send a signal to a beam/antenna user direction simulation unit;
the beam/antenna user direction simulation unit selects different channel equivalent coefficients to multiply with corresponding domain signals to be sent according to the current module working mode; if the system is in an antenna test mode, multiplying the user direction vector by the signal sent by the antenna domain; and if the system is in the beam through mode, multiplying the beam domain equivalent channel matrix by the beam domain transmission signal.
7. The ground experiment system for low earth orbit satellite mobile communication of claim 1, wherein: the satellite channel simulation module comprises NrA parallel multipath delay-Doppler analog unit, wherein NrThe number of receiving users simulated for the system; the multi-path time delay Doppler simulation unit comprises a Doppler frequency offset simulation subunit, a dynamic long time delay simulation subunit and a multi-path simulation subunit;
the Doppler frequency offset simulation subunit is used for simulating the large Doppler frequency offset generated by the high-speed movement of the satellite in the low-orbit satellite-ground channel and outputting the processed signal to the dynamic long-time delay simulation subunit;
the dynamic long-time-delay simulation subunit is used for simulating the dynamic long time delay caused by the dynamic long distance between the satellite and the ground station in the low-orbit satellite-ground channel in the motion process and outputting the processed signal to the multi-path simulation subunit;
the multipath simulation subunit is used for simulating multipath signal transmission caused by a ground complex environment in the low-orbit satellite-ground channel and outputting the processed signal to the digital-to-analog conversion module.
8. The ground experiment system for low earth orbit satellite mobile communication of claim 1, wherein: the digital-to-analog conversion module comprises NrAnd the DAC module is used for respectively carrying out digital-to-analog conversion on the user receiving data of each channel and outputting the analog intermediate frequency signals received by the users.
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| CN114301514B (en) * | 2021-12-27 | 2023-04-07 | 浙江时空道宇科技有限公司 | Satellite simulator for low-orbit satellite constellation communication system and control method |
| CN114826460B (en) * | 2022-03-30 | 2022-11-25 | 中国人民解放军战略支援部队航天工程大学 | Satellite communication simulation teaching link calculation simulation system |
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| CN111147169A (en) * | 2019-12-27 | 2020-05-12 | 东方红卫星移动通信有限公司 | Modeling model and modeling method for low-orbit satellite space-ground communication channel |
| CN112311449A (en) * | 2020-11-16 | 2021-02-02 | 东南大学 | Low-earth-orbit satellite communication dynamic time delay and Doppler simulation method |
| CN112468223A (en) * | 2020-11-25 | 2021-03-09 | 中国科学院微小卫星创新研究院 | Operation simulation method and system for broadband communication constellation |
| CN112468220A (en) * | 2020-11-25 | 2021-03-09 | 中国科学院微小卫星创新研究院 | Distributed broadband communication constellation ground test verification system suitable for multiple scenes |
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