Dynamic simulation system and method for wireless two-way channels

Abstract

The present invention discloses a dynamic simulation system and method for a wireless two-way channel, which relates to the field of communications. The system includes an import module, an input AD module, an analog calculation module, a cache module, a dynamic simulation module, and a time delay module; the method includes S1 importing the initial positions and dynamic positions of each node device to be tested, and inputting the digital signals of the node devices to be tested, S2 simulating the relevant parameter information of the node devices to be tested, S3 simulating and analyzing the total time delay from the node device m to be tested to the node device n to be tested according to the relevant parameter information, S4 delaying and storing the digital signals and relevant parameter information and then transmitting them to the dynamic simulation module, S5 performing signal transmission simulation; it can realize the dynamic change of wireless signals in the wireless two-way channel under the motion state of the transceiver device; it provides a convenient test means for the development and test of wireless communication devices under high-speed motion conditions; it provides an effective performance test means for time synchronization devices based on two-way wireless communication.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to a dynamic simulation system and method for a wireless two-way channel. Background Art

[0002] Using radio two-way communication to achieve time synchronization and meet the need for collaborative work among distributed nodes. The common test methods for time synchronization require placing the master and slave devices together and connecting them to an instrument through a cable for testing. However, in actual applications, the baseline distance between the master and slave devices ranges from several kilometers to thousands of kilometers, and the relative positions of the devices change over time. This makes it difficult to complete the test under existing conditions in actual application scenarios. Summary of the Invention

[0003] The object of the present invention is to design a dynamic simulation system and method for a wireless two-way channel to solve the above problems.

[0004] The present invention achieves the above object through the following technical solutions:

[0005] A dynamic simulation system for a wireless two-way channel, comprising:

[0006] An import module; the import module is used to import the initial positions, dynamic positions, and terrain parameters of the simulation space of each node device to be tested;

[0007] A simulation calculation module; the simulation calculation module is used to simulate and calculate the relevant parameter information of each node device to be tested at each moment, and the data signal input end of the simulation calculation module is connected to the data signal output end of the import module;

[0008] N input AD modules; one input AD module is used to input the digital signal of one node device to be tested;

[0009] N buffer modules; one buffer module is used to buffer the digital signal transmitted by one input AD module, and the data signal input end of one buffer module is connected to the data signal output end of one input AD module;

[0010] A time delay module; the time delay module is used to simulate and calculate the total time delay of each moment from the node device m to be tested to the node device n to be tested according to the relevant parameter information, and calculate the buffer time delay for the input AD module to buffer the digital signal into the buffer module. The data signal output end of the simulation calculation module is connected to the data signal input end of the time delay module, and the data signal output end of the time delay module is connected to the data signal input end of each buffer module;

[0011] N dynamic simulation modules; the dynamic simulation modules are used to simulate the signal transmission process from the device under test node m to the device under test node n. The data signal input end of one dynamic simulation module is respectively connected to the data signal output ends of N buffer modules, and the buffer modules delay the stored digital signals and related parameter information according to the buffer delay and then transmit them to the dynamic simulation module.

[0012] A dynamic simulation method for a wireless two-way channel, which is applied to the dynamic simulation system for a wireless two-way channel as described above, includes:

[0013] S1. Import the initial positions, dynamic positions and terrain parameters of the simulation space of each device under test node, and input the digital signals of each device under test node;

[0014] S2. Simulate and calculate the relevant parameter information of each device under test node at each moment according to the initial position signal and the dynamic position signal;

[0015] S3. Simulate and analyze the total delay from the device under test node m to the device under test node n according to the relevant parameter information, and calculate the buffer delay for caching the initial position signal and the dynamic position signal of the device under test node m to the device under test node n;

[0016] S4. The buffer delay delays the stored digital signals and related parameter information and then transmits them to the dynamic simulation module;

[0017] S5. Perform signal transmission simulation on the digital signals and related parameter information.

[0018] The beneficial effects of the present invention are as follows: it can realize the dynamic change of wireless signals in the transceiver device motion state of the simulated two-way wireless channel; it provides a convenient test means for the development and test of wireless communication devices under high-speed motion conditions; it provides an effective performance test means for time synchronization devices based on two-way wireless communication. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the dynamic simulation system for a wireless two-way channel of the present invention;

[0020] Figure 2 is a schematic connection diagram of the dynamic simulation system of the present invention and the device under test node;

[0021] Figure 3 is a schematic diagram of the dynamic simulation method for a wireless two-way channel of the present invention;

[0022] Figure 4 is a schematic diagram of the delay analysis of the dynamic simulation method for a wireless two-way channel of the present invention. Detailed Embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.

[0024] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0025] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0027] In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, terms such as "arrangement", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0030] As Figure 1 、 Figure 2 shown, a dynamic simulation system for a wireless two-way channel includes:

[0031] Import module; the import module is used to import the initial positions, dynamic positions, and terrain parameters of the simulation space of each node device to be tested;

[0032] Simulation calculation module; the simulation calculation module is used to simulate and calculate the relevant parameter information of each node device to be tested at each moment. The data signal input end of the simulation calculation module is connected to the data signal output end of the import module;

[0033] N input AD modules; one input AD module is used to input the digital signal of one node device to be tested;

[0034] Delay module; the delay module is used to simulate and calculate the total delay at each moment from the node device m to be tested to the node device n according to the relevant parameter information, and calculate the buffer delay of the input AD module to cache the digital signal into the buffer module. The data signal output end of the simulation calculation module is connected to the data signal input end of the delay module, and the data signal output end of the delay module is connected to the data signal input end of each buffer module;

[0035] Delay module; the delay module is used to simulate and calculate the total delay from the node device m to be tested to the node device n according to the relevant parameter information, and calculate the buffer delay of caching the initial position signal and dynamic position signal of the node device m into the node device n;

[0036] N dynamic simulation modules; the dynamic simulation modules are used to simulate the signal transmission process from the node device m to be tested to the node device n. The data signal input end of one dynamic simulation module is respectively connected to the data signal output ends of the N buffer modules. The buffer module delays the stored digital signal and relevant parameter information according to the buffer delay and then transmits it to the dynamic simulation module.

[0037] Both the initial position signal and the dynamic position signal include three-dimensional coordinates and terrain parameters of the simulation space. The relevant parameter information includes relative distance, radial velocity, radial acceleration, and terrain parameters of the location.

[0038] Each dynamic simulation module includes:

[0039] Doppler frequency shift module; the Doppler frequency shift module simulates and calculates the Doppler frequency shift parameters of the signal from the node device m to be tested to the node device n according to the relevant parameter information. The data signal input end of the Doppler frequency shift module is connected to the data signal output end of the simulation calculation module;

[0040] Frequency shift cross - calculation module; the frequency shift cross - calculation module is used to analyze the digital signal waveforms after the superposition of Doppler frequency shifts when the other N - 1 nodes to be tested reach the node to be tested n. The data signal input terminal of the frequency shift cross - calculation module is connected to the data signal output terminal of the Doppler frequency shift module;

[0041] Channel fading and multipath simulation module; the channel fading and multipath simulation module simulates and calculates the spatial fading of the signals from the other N - 1 nodes to be tested when they reach the node to be tested n and the multipath effect caused by terrain reasons according to relevant parameter information. The data signal input of the channel fading and multipath simulation module is connected to the data signal output terminal of the simulation calculation module;

[0042] Fading and multipath cross - calculation module; the fading and multipath cross - calculation module is used to calculate the digital signal waveforms after the superposition of the signals from the other N - 1 nodes to be tested. The data signal input terminal of the fading and multipath cross - calculation module is connected to the data signal output terminals of the channel fading and multipath simulation module and the frequency shift cross - calculation module.

[0043] Each dynamic simulation module also includes an output DA module. The output DA module is used to convert the digital signal waveform into an analog signal waveform and output it to the node to be tested n. The data signal input terminal of the output DA module is connected to the data signal output terminal of the fading and multipath cross - calculation module.

[0044] As Figure 3 、 Figure 4 shown, the dynamic simulation method for a wireless two - way channel, which is applied to the dynamic simulation system for a wireless two - way channel as described above, includes:

[0045] S1. The user imports the initial positions and dynamic positions of each node to be tested through the import module, and inputs the digital signals of each node to be tested through the input AD module.

[0046] S2. Simulate the relevant parameter information of each node to be tested at each moment according to the initial position signal and the dynamic position signal. The relevant parameter information includes relative distance, radial velocity, radial acceleration, and terrain parameters of the location.

[0047] S3. Simulate and analyze the total time delay from the node to be tested m to the node to be tested n according to the relevant parameter information, and calculate the caching time delay for caching the initial position signal and the dynamic position signal of the node to be tested m to the node to be tested n.

[0048] S4. The caching time delay delays the stored digital signals and relevant parameter information and then transmits them to the dynamic simulation module.

[0049] S5. Conduct signal transmission simulation on the digital signals and relevant parameter information; specifically including:

[0050] S51. Simulate and calculate the Doppler frequency shift of the signal from the device under test m to the device under test n according to the relative radial velocity;

[0051] S52. Analyze the digital signal waveforms after the superposition of the Doppler frequency shift when the other N - 1 devices under test reach the device under test n;

[0052] S53. Calculate the spatial fading of the signals from the other N - 1 devices under test to the device under test n and the multipath effect caused by the terrain according to the relative distance and terrain parameters;

[0053] S54. Analyze the digital signal waveforms after the superposition of the spatial fading and the multipath effect when the other N - 1 devices under test reach the device under test n;

[0054] S55. Convert the two digital signal waveforms into analog signal waveforms and output them to the corresponding device under test n.

[0055] Specific process example: As Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, in this description, the total number of devices under test N = 3;

[0056] Due to the differences in physical devices, T1 and T3 of each port are different, that is, the input physical delay: T 11 ≠T 12 ≠T 13 , the output physical delay: T 31 ≠T 32 ≠T 33 . In order to accurately control the delay, correction delays ΔT 1m and ΔT 3n need to be introduced for each port to standardize the input delay T1 and the output delay T3, satisfying:

[0057] T1 = T 11 +ΔT 11 = T 12 +ΔT 12 = T 13 +ΔT 13

[0058] T3 = T 31 +ΔT 31 = T 32 +ΔT 32 = T 33 +ΔT 33

[0059] At T 2mnIn the compensation calculation, the input physical delays (T 11 , T 12 , T 13 ), the output physical delays (T 31 , T 32 , T 33 ), and the correction delays (ΔT 1m , ΔT 3n ) are incorporated into the delay calculation, i.e.:

[0060] T 2mn = T 总mn - (T1 + T3) = T 总mn - (T 1m + ΔT 1m + T 3n + ΔT 3n )

[0061] Thus, T 总mn satisfies the following equation to achieve accurate calculation of the delay from port m to port n;

[0062] T 总mn = T1 + T 2mn + T3 = T 1m + ΔT 1m + T 2mn + T 3n + ΔT 3n

[0063] First, through physical measurement methods, the input physical delays (T 11 , T 12 , T 13 ), and the output physical delays (T 31 , T 32 , T 33 ) are determined.

[0064] Let the input nominal delay T1 = T 11 , then the input compensation delay is determined as:

[0065] ΔT 11 = 0

[0066] ΔT 12 = T 11 - T 12

[0067] ΔT 13 = T 11 - T 13

[0068] Let the output nominal delay T3 = T 31 , then the output compensation delay is determined as:

[0069] ΔT 31 = 0

[0070] ΔT 32 = T 31 - T 32

[0071] ΔT 33 = T 31 - T 33

[0072] The import module inputs the initial positions, dynamic positions, and terrain parameters of the nodes to be tested corresponding to the three ports. The initial positions and dynamic positions include three-dimensional coordinates;

[0073] The simulation calculation module calculates the relative distances, radial velocities, radial accelerations, and terrain parameters of the corresponding devices at each moment according to the input initial positions, dynamic positions, and terrain parameters of the simulation space;

[0074] The delay module simulates the time delay T of the signal from one device (port) to another device (port) according to the relative distances of the nodes to be tested corresponding to the three ports output by the simulation calculation module at each moment 总mn , and calculates T according to the following formula 2mn :

[0075] T 2mn = T 总mn - (T 1m + ΔT 1m + T 3n + ΔT 3n )

[0076] The AD module at port m (m ∈ (1, 2, 3)) samples the analog signal of the test device connected to port m, converts it into a digital signal, and caches the sampled data in the cache module corresponding to port m;

[0077] The cache module corresponding to port m stores the digital signal sampled by the upstream input AD module, and delays the stored signal according to the time delay parameter T determined by the delay module 2mn and outputs it to the subsequent dynamic simulation module;

[0078] The Doppler frequency shift module simulates and calculates the Doppler frequency shift of the signal from the node to be tested device m to the node to be tested device n according to the relative radial velocity;

[0079] The frequency shift cross calculation module at port n (n ∈ (1, 2, 3)) is composed of frequency shift cross calculation modules at 3 ports respectively. Using the frequency shift parameters output by the Doppler frequency shift module, it calculates the signal waveforms after superimposing the Doppler frequency shift when the signals from the other two ports arrive at this port; Figure 4 For example

[0080] The channel fading and multipath simulation module calculates the spatial fading of signals from the other two device nodes to be tested reaching the device node n to be tested and the multipath effect caused by terrain based on the relative distance and terrain parameters;

[0081] The fading and multipath cross - calculation module for port n (n ∈ (1, 2, 3)) calculates the signal waveform after the superposition of various signals according to the spatial fading signal and multipath effect reaching this port output by the channel fading and multipath simulation module;

[0082] The DA module at port n (n ∈ (1, 2, 3)) outputs converts the digital waveforms output by the upstream frequency - shift cross - calculation module and the fading and multipath cross - calculation module into analog waveforms and outputs them to the device node n to be tested;

[0083] The clock module provides a unified sampling and calculation clock for the AD module at port n, the buffer module at port n, the frequency - shift cross - calculation module, the fading and multipath cross - calculation module at port n, and the DA module at port n, enabling each module to work synchronously. Thus, the time delay for signals to reach other ports through any port can be reliably controlled.

[0084] The model of the frequency - shift cross - calculation module is provided, enabling the dynamic simulation system to have more than 3 physical interfaces, so that the communication and timing performance of multi - node wireless communication devices under moving conditions can be tested;

[0085] A strict time - delay module, buffer module and related time - delay calculation formulas are provided, offering an effective means for performance testing of time - synchronization devices based on two - way wireless communication;

[0086] The present invention provides a means to simulate the dynamic change of wireless signals in a two - way wireless channel under the moving state of transceiver devices;

[0087] The present invention provides a convenient testing means for the development and testing of wireless communication devices under high - speed moving conditions.

[0088] The technical solution of the present invention is not limited to the limitations of the above - mentioned specific embodiments. Any technical deformation made according to the technical solution of the present invention falls within the protection scope of the present invention.

Claims

1. A dynamic simulation system for a wireless two-way channel, characterized in that, Including: Import module; The import module is used to import the initial position, dynamic position and terrain parameters of the simulation space of each node device to be tested; Simulation calculation module; The simulation calculation module is used to simulate and calculate the relevant parameter information of each node device to be tested at each moment. The data signal input end of the simulation calculation module is connected to the data signal output end of the import module; N input AD modules; one input AD module is used to input the digital signal of one node device to be tested; N buffer modules; one buffer module is used to buffer the digital signal transmitted by one input AD module. The data signal input end of one buffer module is connected to the data signal output end of one input AD module; Delay module; The delay module is used to simulate and calculate the total delay at each moment from node device m to node device n to be tested according to the relevant parameter information, and calculate the buffer delay for the input AD module to buffer the digital signal into the buffer module. The data signal output end of the simulation calculation module is connected to the data signal input end of the delay module, and the data signal output end of the delay module is connected to the data signal input end of each buffer module; N dynamic simulation modules; the dynamic simulation modules are used to simulate the signal transmission process from node device m to node device n to be tested. The data signal input end of one dynamic simulation module is respectively connected to the data signal output ends of N buffer modules. The buffer module delays the stored digital signal and relevant parameter information according to the buffer delay and then transmits it to the dynamic simulation module; Each dynamic simulation module includes: Doppler frequency shift module; the Doppler frequency shift module simulates and calculates the Doppler frequency shift parameter of the signal from node device m to node device n to be tested according to the relevant parameter information. The data signal input end of the Doppler frequency shift module is connected to the data signal output end of the simulation calculation module; Frequency shift cross calculation module; the frequency shift cross calculation module is used to analyze the digital signal waveform after superimposing the Doppler frequency shift when the other N-1 node devices to be tested reach node device n to be tested. The data signal input end of the frequency shift cross calculation module is connected to the data signal output end of the Doppler frequency shift module; Channel fading and multipath simulation module; the channel fading and multipath simulation module simulates and calculates the spatial fading of the signal from the other N-1 node devices to be tested to node device n to be tested and the multipath effect formed due to terrain reasons. The data signal input of the channel fading and multipath simulation module is connected to the data signal output end of the simulation calculation module; Fading and multipath cross calculation module; the fading and multipath cross calculation module is used to calculate the digital signal waveform after superimposing the signals of the other N-1 node devices to be tested. The data signal input end of the fading and multipath cross calculation module is connected to the data signal output ends of the channel fading and multipath simulation module and the frequency shift cross calculation module.

2. The dynamic simulation system for a wireless two-way channel according to claim 1, wherein Both the initial position signal and the dynamic position signal include three-dimensional coordinates, and the relevant parameter information includes relative distance, radial velocity, radial acceleration, and terrain parameters of the location.

3. The dynamic simulation system for a wireless two-way channel according to claim 1, characterized in that Each dynamic simulation module further includes an output DA module, which is used to convert the digital signal waveform into an analog signal waveform and output it to the device under test node n. The data signal input end of the output DA module is connected to the data signal output end of the fading and multipath cross calculation module.

4. A dynamic simulation method for a wireless two-way channel, applied to the dynamic simulation system for a wireless two-way channel according to any one of claims 1-3, characterized in that, Including: S1. Import the initial positions and dynamic positions of each device under test node and input the digital signals of each device under test node; S2. Simulate and calculate the relevant parameter information of each device under test node at each moment according to the initial position signal and the dynamic position signal; S3. Simulate and analyze the total time delay from the device under test node m to the device under test node n according to the relevant parameter information, and calculate the cache time delay for caching the initial position signal and the dynamic position signal of the device under test node m to the device under test node n; S4. After delaying the cached digital signals and relevant parameter information by the cache time delay, transmit them to the dynamic simulation module; S5. Simulate the signal transmission of the digital signals and relevant parameter information; specifically including: S51. Simulate and calculate the Doppler frequency shift of the signal from the device under test node m to the device under test node n according to the relative radial velocity; S52. Analyze the digital signal waveforms after superimposing the Doppler frequency shift when the other N - 1 devices under test nodes reach the device under test node n; S53. Calculate the spatial fading of the signal from the other N - 1 devices under test nodes to the device under test node n and the multipath effect formed due to the terrain according to the relative distance and terrain parameters; S54. Analyze the digital signal waveforms after superimposing the spatial fading and the multipath effect when the other N - 1 devices under test nodes reach the device under test node n; S55. Convert the digital signal waveform into an analog signal waveform and output it to the corresponding device under test node n.

5. The dynamic simulation method for a wireless two-way channel according to claim 4, characterized in that, Both the initial position signal and the dynamic position signal include three-dimensional coordinates and terrain parameters of the simulated space. The relevant parameter information includes relative distance, radial velocity, radial acceleration, and terrain parameters of the location.

6. The dynamic simulation method for a wireless two-way channel according to claim 4, characterized in that In S3, it includes: S31. Simulate and analyze the total delay from the device under test m to the device under test n according to the relative distance ; S32. Determine the input physical delay through physical measurement and the output physical delay ; S33. Calculate the cache latency , expressed as: .

Images