CN114039640B - Mobile satellite baseband channel simulation system suitable for Ka frequency band - Google Patents
Mobile satellite baseband channel simulation system suitable for Ka frequency band Download PDFInfo
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 36
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- 230000007613 environmental effect Effects 0.000 claims description 11
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/40—Monitoring; Testing of relay systems
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Abstract
The invention provides a mobile satellite baseband channel simulation system suitable for Ka frequency band, comprising: the device comprises a parameter setting unit, a Ka frequency band transmitter, a Ka frequency band transmitting antenna, an environment simulation unit, a channel simulation device, a Ka frequency band receiving antenna and an attenuation analysis unit; the Ka frequency band transmitter is used for simulating the Ka frequency band signal generated by the communication terminal, and the Ka frequency band transmitting antenna is used for transmitting the Ka frequency band signal; the environment simulation unit is used for calculating a distribution factor and a distribution random number through Gaussian distribution amplitude mean value, amplitude variance, phase mean value and phase variance based on the environment parameters; the channel simulation device is used for simulating real channels of different scenes according to the distribution factors and the distribution random numbers; the attenuation analysis unit is used for calculating a fading factor according to the Ka frequency band receiving signal and the Ka frequency band signal; and calculating a real fading parameter according to the target flying height and the relative moving speed of the mobile satellite, the simulated communication distance and the fading factor, and determining whether the Ka frequency band signal meets the communication requirement.
Description
Technical Field
The invention relates to the technical field of ship communication, in particular to a mobile satellite baseband channel simulation system suitable for Ka frequency bands.
Background
In a satellite communication system, to realize reliable transmission of connection end and satellite information, the influence of different environmental conditions on communication needs to be considered, and different channels are needed to be adopted specifically for the influence. But the satellite can not be transmitted and then the channel can not be selected, the channel is required to be determined on the ground, a channel simulator is generally adopted to simulate the fading characteristics of the satellite mobile channel under different environmental conditions, and meanwhile, the channel simulator is adopted to simulate and verify the practicability and the effectiveness of various communication technologies. The channel simulator mainly comprises three kinds of intermediate frequency channel simulators, a baseband channel simulator and a radio frequency channel simulator.
In the related art, a channel simulator based on a Ka band includes a real-time channel control device for outputting a binary data stream and setting a working frequency, a track height, a channel type, a modulation mode, a mobile channel condition, and the like; and the simulation parameter setting module is used for setting the environment parameters so as to simulate corresponding environment conditions, such as rainfall, snowfall, rainfall, snowfall and the like. And then, calculating signal fading factors under corresponding environmental conditions, and determining the compensation quantity of the signal fading factors based on a Gaussian algorithm, an exponential algorithm and the like. The error code statistics unit is used for determining the type of the initial error code pattern and the error code threshold value TH according to probability distribution, error codes and the like, generating a transition error code pattern, and inputting the transition error code pattern into the error code superposition module; the error code superposition module is used for superposing the transition error code pattern and the digital baseband binary data stream to obtain the link simulation error code pattern.
Disclosure of Invention
The invention aims to solve the technical problem that the fading characteristics of mobile satellite baseband signals under the Ka frequency band are difficult to simulate under different environmental conditions by adopting a channel simulator, and provides a mobile satellite baseband channel simulation system suitable for the Ka frequency band.
The invention adopts the following technical means for solving the technical problems:
The invention provides a mobile satellite baseband channel simulation system suitable for Ka frequency band, which comprises: the device comprises a parameter setting unit, a Ka frequency band transmitter connected with the parameter setting unit, a Ka frequency band transmitting antenna connected with the Ka frequency band transmitter, an environment simulation unit, a channel simulation device, a Ka frequency band receiving antenna and an attenuation analysis unit connected with the Ka frequency band receiving antenna;
The Ka frequency band transmitter is used for simulating a Ka frequency band signal generated by the communication end based on the Ka parameter set by the user and received by the parameter setting unit, and the Ka frequency band transmitting antenna is arranged at one end of the simulation device and used for transmitting the Ka frequency band signal;
The environment simulation unit is arranged in the channel simulation device and is used for calculating a distribution factor and a distribution random number based on environment parameters set by a user through a Gaussian distribution amplitude mean value, a Gaussian distribution amplitude variance, a Gaussian distribution phase mean value and a Gaussian distribution phase variance, wherein the distribution factor and the distribution random number are used for representing the distribution condition of influence factors in each simulation channel area in the channel simulation device;
The channel simulation device is used for simulating real channels in each simulation channel area according to the distribution factors and the distribution random numbers so as to simulate real channels of the communication terminal and the mobile satellite in different communication distances and different relative movement speeds under different weather scenes;
The attenuation analysis unit is used for analyzing and calculating a mobile channel fading factor according to the signal intensity of the Ka frequency band receiving signal aiming at the Ka frequency band signal and the signal intensity of the Ka frequency band signal received by the Ka frequency band receiving antenna; and is combined with the other components of the water treatment device,
According to the target flying height and the relative moving speed of the mobile satellite, the simulated communication distance provided by the channel simulation device and the mobile channel fading factor, calculating the real fading parameters of the mobile satellite, wherein the real fading parameters comprise at least one of path loss, shadow fading and Doppler frequency shift, and determining whether the Ka frequency band signal meets the communication requirement of the mobile satellite according to the real fading parameters.
Preferably, the environment simulation unit is specifically configured to:
Randomly determining a space track of an initial influence factor according to the environmental parameter, and calculating a space extremum scale of the space track of the influence factor according to the Gaussian distribution amplitude average value and the Gaussian distribution phase average value;
calculating a plurality of local special trajectories of the influence factors according to the spatial extremum scale based on a KLT characteristic tracking algorithm;
randomly selecting a preset number of local special motion tracks according to the Gaussian distribution amplitude variance and the Gaussian distribution phase variance, and constructing subspaces according to the selected local special motion tracks;
Determining a projection matrix according to the constructed subspaces, reconstructing the plurality of local special motion tracks, and calculating a reconstruction error until the number of times for randomly selecting a preset number of the local special motion track construction subspaces meets the preset iteration number;
And selecting the subspace with the minimum reconstruction error as a target subspace, and calculating the distribution factor and the distribution random number according to a projection matrix of the target subspace.
Preferably, the channel simulation system includes an interference frequency band generating unit, configured to simulate an interference frequency band signal existing in a channel of the channel simulation device based on the received interference frequency band parameter set by the user.
Preferably, the interference frequency band generating unit is specifically configured to simulate interference frequency band signals with different directions, different interference areas and different intensities by setting interference parameters of the first channel jammer.
Preferably, the interference frequency band signal includes: at least one of an operating frequency band of FSS fixed satellite service, an operating frequency band of FS fixed service, and an operating frequency band of WLAN wireless local area network.
Preferably, the attenuation analysis unit is specifically configured to:
Determining an amplification factor of the mobile channel fading factor according to the target flying height of the mobile satellite and the analog communication distance provided by the channel analog device;
Calculating the compensation quantity of the amplification coefficient of the mobile channel fading factor according to the relative movement speed;
Compensating the amplification factor according to the compensation quantity;
and calculating the real fading parameters of the mobile satellite according to the compensated amplification coefficient and the mobile channel fading factor.
Preferably, the attenuation analysis unit is specifically configured to:
determining the number of attenuation pyramid layers according to the target flying height of the mobile satellite and the simulation communication distance provided by the channel simulation device, and constructing an optical flow pyramid according to the attenuation pyramid layers;
Determining an initial amplification factor of the highest pyramid according to the ratio between the target flying height and the analog communication distance;
And calculating the amplification factor of each layer according to the initial amplification factor based on a least square method, and integrating and calculating the amplification factor of the mobile channel fading factor according to the attenuation pyramid layer number, the initial amplification factor and the amplification factor of each layer, wherein the amplification factor of each layer is calculated based on the amplification factor of the previous layer.
The beneficial effects are that:
The Ka frequency band transmitter is used for simulating the Ka frequency band signal generated by the communication end based on the Ka parameter set by the user and received by the parameter setting unit, and the Ka frequency band transmitting antenna is arranged at one end of the simulation device and used for transmitting the Ka frequency band signal; the environment simulation unit is arranged in the channel simulation device and is used for calculating a distribution factor and a distribution random number based on environment parameters set by a user and through a Gaussian distribution amplitude mean value, a Gaussian distribution amplitude variance, a Gaussian distribution phase mean value and a Gaussian distribution phase variance, wherein the distribution factor and the distribution random number are used for representing the distribution condition of influence factors in each simulation channel area in the channel simulation device; the channel simulation device is used for simulating real channels in each simulation channel area according to the distribution factors and the distribution random numbers so as to simulate real channels of the communication terminal and the mobile satellite in different communication distances and different relative movement speeds under different weather scenes; the attenuation analysis unit is used for analyzing and calculating a mobile channel fading factor according to the signal intensity of the Ka frequency band receiving signal aiming at the Ka frequency band signal and the signal intensity of the Ka frequency band signal received by the Ka frequency band receiving antenna; according to the target flying height and the relative moving speed of the mobile satellite, the simulated communication distance provided by the channel simulation device and the mobile channel fading factor, calculating the real fading parameters of the mobile satellite, wherein the real fading parameters comprise at least one of path loss, shadow fading and Doppler frequency shift, and determining whether the Ka frequency band signal meets the communication requirement of the mobile satellite according to the real fading parameters. In this way, based on the influencing factors provided by the environment simulation unit and the real channel provided by the channel simulation device, the attenuation analysis unit can calculate the mobile channel fading factor and calculate the real fading parameters of the mobile satellite, so as to determine whether the Ka frequency band signal meets the communication requirement of the mobile satellite. The method achieves the purpose of simulating fading characteristics of mobile satellite baseband signals under Ka frequency bands by adopting a channel simulator under different environmental conditions. The convenience of mobile satellite baseband channel simulation is improved.
Drawings
Fig. 1 is a schematic structural diagram of a mobile satellite baseband channel simulation system suitable for Ka band according to the present invention.
Fig. 2 is a schematic structural diagram of another mobile satellite baseband channel simulation system suitable for Ka band according to the present invention.
The invention has the advantages of realizing the purpose, functional characteristics and advantages, and further description with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a schematic structure diagram of a mobile satellite baseband channel simulation system suitable for Ka band according to an embodiment of the present invention, the system 100 includes: a parameter setting unit 110, a Ka band transmitter 120 connected to the parameter setting unit 110, a Ka band transmitting antenna 130 connected to the Ka band transmitter 120, an environment simulation unit 140, a channel simulation device 150, a Ka band receiving antenna 160, and an attenuation analysis unit 170 connected to the Ka band receiving antenna 160;
The Ka band transmitter 120 is configured to simulate a Ka band signal generated by the communication terminal based on the Ka parameter set by the user and received by the parameter setting unit 110, and the Ka band transmitting antenna 130 is disposed at one end of the analog device and is configured to transmit the Ka band signal;
The environment simulation unit 140 is disposed inside the channel simulation device 150, and is configured to calculate a distribution factor and a distribution random number based on the environmental parameters set by the user and through a gaussian distribution amplitude mean value, a gaussian distribution amplitude variance, a gaussian distribution phase mean value and a gaussian distribution phase variance, where the distribution factor and the distribution random number are used to characterize the distribution condition of the influencing factors in each simulation channel region inside the channel simulation device 150;
the channel simulation device 150 is configured to simulate real channels in each of the simulated channel regions according to the distribution factor and the distribution random number, so as to simulate real channels of the communication terminal and the mobile satellite in different communication distances and different relative movement speeds in different weather scenes;
The Ka band receiving antenna 160 is disposed at the other end of the analog device, and is configured to receive a Ka band receiving signal for the Ka band signal;
The attenuation analysis unit 170 is configured to analyze and calculate a mobile channel fading factor according to the signal strength of the Ka band received signal for the Ka band signal and the signal strength of the Ka band signal received by the Ka band receiving antenna 160; and is combined with the other components of the water treatment device,
And calculates a real fading parameter of the mobile satellite according to the target altitude and the relative moving speed of the mobile satellite, the simulated communication distance provided by the channel simulation device 150 and the mobile channel fading factor, wherein the real fading parameter comprises at least one of path loss, shadow fading and Doppler frequency shift, and determines whether the Ka frequency band signal meets the communication requirement of the mobile satellite according to the real fading parameter.
The distribution condition of the influencing factors in each simulation channel area can be the rainfall distribution condition of different simulation channel areas, including rainfall intensity, rainfall range and rainfall duration. The snowfall distribution conditions of different simulated channel areas can also be adopted, including snowfall intensity, snowfall range and snowfall duration. The temperature and humidity distribution conditions and the illumination distribution conditions of different simulation channel areas can be adopted.
In this way, based on the influencing factors provided by the environment simulation unit and the real channel provided by the channel simulation device, the attenuation analysis unit can calculate the mobile channel fading factor and calculate the real fading parameters of the mobile satellite, so as to determine whether the Ka frequency band signal meets the communication requirement of the mobile satellite. The method achieves the purpose of simulating fading characteristics of mobile satellite baseband signals under Ka frequency bands by adopting a channel simulator under different environmental conditions. The convenience of mobile satellite baseband channel simulation is improved.
Preferably, the environment simulation unit 140 is specifically configured to:
Randomly determining a space track of an initial influence factor according to the environmental parameter, and calculating a space extremum scale of the space track of the influence factor according to the Gaussian distribution amplitude average value and the Gaussian distribution phase average value;
calculating a plurality of local special trajectories of the influence factors according to the spatial extremum scale based on a KLT characteristic tracking algorithm;
randomly selecting a preset number of local special motion tracks according to the Gaussian distribution amplitude variance and the Gaussian distribution phase variance, and constructing subspaces according to the selected local special motion tracks;
Determining a projection matrix according to the constructed subspaces, reconstructing the plurality of local special motion tracks, and calculating a reconstruction error until the number of times for randomly selecting a preset number of the local special motion track construction subspaces meets the preset iteration number;
And selecting the subspace with the minimum reconstruction error as a target subspace, and calculating the distribution factor and the distribution random number according to a projection matrix of the target subspace.
Preferably, referring to fig. 2, which is a schematic structural diagram of another mobile satellite baseband channel simulation system suitable for Ka band in an embodiment of the present invention, the channel simulation system 100 includes an interference band generating unit 180 configured to simulate an interference band signal existing in a channel of the channel simulation device 150 based on the received interference band parameter set by a user.
Preferably, the interference frequency band generating unit 180 is specifically configured to simulate interference frequency band signals with different directions, different interference areas and different intensities by setting interference parameters of the first channel interferer.
Preferably, the interference frequency band signal includes: at least one of an operating frequency band of FSS fixed satellite service, an operating frequency band of FS fixed service, and an operating frequency band of WLAN wireless local area network.
Preferably, the attenuation analysis unit 170 is specifically configured to:
Determining an amplification factor of the mobile channel fading factor according to the target altitude of the mobile satellite and the analog communication distance provided by the channel analog device 150;
Calculating the compensation quantity of the amplification coefficient of the mobile channel fading factor according to the relative movement speed;
Compensating the amplification factor according to the compensation quantity;
and calculating the real fading parameters of the mobile satellite according to the compensated amplification coefficient and the mobile channel fading factor.
Preferably, the attenuation analysis unit 170 is specifically configured to:
determining the number of attenuation pyramid layers according to the target flying height of the mobile satellite and the analog communication distance provided by the channel analog device 150, and constructing an optical flow pyramid according to the attenuation pyramid layers;
Determining an initial amplification factor of the highest pyramid according to the ratio between the target flying height and the analog communication distance;
And calculating the amplification factor of each layer according to the initial amplification factor based on a least square method, and integrating and calculating the amplification factor of the mobile channel fading factor according to the attenuation pyramid layer number, the initial amplification factor and the amplification factor of each layer, wherein the amplification factor of each layer is calculated based on the amplification factor of the previous layer.
In this way, based on the influencing factors provided by the environment simulation unit and the real channel provided by the channel simulation device, the attenuation analysis unit can calculate the mobile channel fading factor and calculate the real fading parameters of the mobile satellite, so as to determine whether the Ka frequency band signal meets the communication requirement of the mobile satellite. The method achieves the purpose of simulating fading characteristics of mobile satellite baseband signals under Ka frequency bands by adopting a channel simulator under different environmental conditions. The convenience of mobile satellite baseband channel simulation is improved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A mobile satellite baseband channel simulation system suitable for Ka band, said system comprising: the device comprises a parameter setting unit, a Ka frequency band transmitter connected with the parameter setting unit, a Ka frequency band transmitting antenna connected with the Ka frequency band transmitter, an environment simulation unit, a channel simulation device, a Ka frequency band receiving antenna and an attenuation analysis unit connected with the Ka frequency band receiving antenna;
The Ka frequency band transmitter is used for simulating the Ka frequency band signal generated by the communication end based on the Ka parameter set by the user and received by the parameter setting unit, and the Ka frequency band transmitting antenna is arranged at one end of the simulation device and used for transmitting the Ka frequency band signal;
The environment simulation unit is arranged in the channel simulation device and is used for calculating a distribution factor and a distribution random number based on environment parameters set by a user through a Gaussian distribution amplitude mean value, a Gaussian distribution amplitude variance, a Gaussian distribution phase mean value and a Gaussian distribution phase variance, wherein the distribution factor and the distribution random number are used for representing the distribution condition of influence factors in each simulation channel area in the channel simulation device;
The channel simulation device is used for simulating real channels in each simulation channel area according to the distribution factors and the distribution random numbers so as to simulate real channels of the communication terminal and the mobile satellite in different communication distances and different relative movement speeds under different weather scenes;
The attenuation analysis unit is used for analyzing and calculating a mobile channel fading factor according to the signal intensity of the Ka frequency band receiving signal aiming at the Ka frequency band signal and the signal intensity of the Ka frequency band signal received by the Ka frequency band receiving antenna; and is combined with the other components of the water treatment device,
According to the target flying height and the relative moving speed of the mobile satellite, the simulated communication distance provided by the channel simulation device and the mobile channel fading factor, calculating the real fading parameters of the mobile satellite, wherein the real fading parameters comprise at least one of path loss, shadow fading and Doppler frequency shift, and determining whether the Ka frequency band signal meets the communication requirement of the mobile satellite according to the real fading parameters.
2. The channel simulation system according to claim 1, wherein the environment simulation unit is specifically configured to:
Randomly determining a space track of an initial influence factor according to the environmental parameter, and calculating a space extremum scale of the space track of the influence factor according to the Gaussian distribution amplitude average value and the Gaussian distribution phase average value;
calculating a plurality of local special trajectories of the influence factors according to the spatial extremum scale based on a KLT characteristic tracking algorithm;
randomly selecting a preset number of local special motion tracks according to the Gaussian distribution amplitude variance and the Gaussian distribution phase variance, and constructing subspaces according to the selected local special motion tracks;
Determining a projection matrix according to the constructed subspaces, reconstructing the plurality of local special motion tracks, and calculating a reconstruction error until the number of times for randomly selecting a preset number of the local special motion track construction subspaces meets the preset iteration number;
And selecting the subspace with the minimum reconstruction error as a target subspace, and calculating the distribution factor and the distribution random number according to a projection matrix of the target subspace.
3. The channel simulation system according to claim 1, wherein the channel simulation system comprises an interference frequency band generating unit for simulating an interference frequency band signal existing in a channel of the channel simulation apparatus based on the received interference frequency band parameter set by the user.
4. The channel simulation system according to claim 3, wherein the interference frequency band generating unit is specifically configured to simulate interference frequency band signals with different directions, different interference areas and different intensities by setting interference parameters of the first channel interferer.
5. The channel simulation system according to claim 3 or 4, wherein the interference band signal comprises: at least one of an operating frequency band of FSS fixed satellite service, an operating frequency band of FS fixed service, and an operating frequency band of WLAN wireless local area network.
6. The channel simulation system according to claim 1, wherein the attenuation analysis unit is specifically configured to:
Determining an amplification factor of the mobile channel fading factor according to the target flying height of the mobile satellite and the analog communication distance provided by the channel analog device;
Calculating the compensation quantity of the amplification coefficient of the mobile channel fading factor according to the relative movement speed;
Compensating the amplification factor according to the compensation quantity;
and calculating the real fading parameters of the mobile satellite according to the compensated amplification coefficient and the mobile channel fading factor.
7. The channel simulation system according to claim 6, wherein the attenuation analysis unit is specifically configured to:
determining the number of attenuation pyramid layers according to the target flying height of the mobile satellite and the simulation communication distance provided by the channel simulation device, and constructing an optical flow pyramid according to the attenuation pyramid layers;
Determining an initial amplification factor of the highest pyramid according to the ratio between the target flying height and the analog communication distance;
And calculating the amplification factor of each layer according to the initial amplification factor based on a least square method, and integrating and calculating the amplification factor of the mobile channel fading factor according to the attenuation pyramid layer number, the initial amplification factor and the amplification factor of each layer, wherein the amplification factor of each layer is calculated based on the amplification factor of the previous layer.
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