Network radio multipoint time difference positioning and simulation design system

Abstract

The invention discloses a network radio multipoint time difference positioning and simulation design system, which relates to the field of network radio, comprises a positioning unit, and is characterized in that the positioning unit comprises a radio signal receiving unit and a time synchronization unit, the output end of the time synchronization unit is electrically connected with the input end of a data processing unit, and the output end of the data processing unit is electrically connected with the output end of the radio signal receiving unit. The output end of the data processing unit is electrically connected with the input end of a calculation unit. According to the network radio multipoint time difference positioning and simulation design system, the position of the target can be determined according to the time difference of the target signals received by the plurality of receiving points in a network radio environment, and when the target transmits radio signals, due to the fact that the distances between the receiving points and the target are different, the positioning accuracy of the target is improved. Time difference exists when signals are transmitted to all receiving points, and the system can calculate the position of a target through a specific algorithm by accurately measuring the time difference and combining known position information of the receiving points.

Description

Technical Field

[0001] The invention relates to the field of network radio, and in particular to a network radio multi-point time difference positioning and simulation design system. Background Art

[0002] Radio waves refer to electromagnetic waves in the radio frequency band that propagate in free space. The shorter the wavelength of the radio waves and the higher the frequency, the more information can be transmitted in the same amount of time. There are the following ways in which radio waves propagate in space: direct radiation, reflection, refraction, penetration, diffraction and scattering.

[0003] When the target transmits a radio signal, due to the different distances between each receiving point and the target, the time it takes for the signal to propagate to each receiving point varies, resulting in major problems in the subsequent time difference positioning and model simulation design.

[0004] Therefore, it is necessary to propose a network radio multi-point time difference positioning and simulation design system to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a network radio multi-point time difference positioning and simulation design system, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A network radio multi-point time difference positioning system, comprising a positioning unit, the positioning unit comprising a radio signal receiving unit and a time synchronization unit, the output end of the time synchronization unit being electrically connected to the input end of a data processing unit, the output end of the data processing unit being electrically connected to the input end of a calculation unit, the input end of the time synchronization unit being electrically connected to the output end of a selection module, the input end of the selection module being electrically connected to the output end of a priority setting module, the output end of the priority setting module being electrically connected to the input ends of a GPS timing receiving module, a network time protocol confirmation module and a precision time protocol confirmation module;

[0008] The radio signal receiving unit is used to receive the time receiving point of the radio signal, the time synchronization unit is used to ensure that each time receiving point works under the same time reference, the data processing unit is used to collect the signal time data of each receiving point and process it, the calculation unit calculates the target position based on the algorithm using the time difference data and the position information of the receiving point, the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module are used to measure the time difference, the priority setting module is used to set the priority of the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module, and the selection module selects the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module based on the priority.

[0009] Preferably, the radio signal receiving unit includes a baseband processing unit and an intermediate frequency processing unit, the baseband processing unit includes a signal processing module, and the output end of the signal processing module is electrically connected to the input end of the display module;

[0010] The baseband processing unit is used to process the demodulated baseband signal, including but not limited to decoding, error correction, demultiplexing of digital signals, channel decoding, and source decoding; amplification, shaping, and other processing of analog signals such as audio and video, so that the signal can be correctly played or displayed by the terminal device.

[0011] Preferably, the input end of the intermediate frequency processing unit is electrically connected to the output end of the receiving antenna and the RF front end, and the output end of the intermediate frequency processing unit is electrically connected to the input end of the demodulation module, the signal strength enhancement module, the digital intermediate frequency processing module and the noise interference suppression module;

[0012] The receiving antenna is used to convert radio waves in space into electrical signals. The RF front end includes a low-noise amplifier, a filter, and a mixer. The low-noise amplifier is used to amplify the weak electrical signals received by the antenna while minimizing the noise introduced by itself to improve the signal-to-noise ratio of the signal; the filter is used to select the signal of the required frequency band, suppress the interference signals of other frequency bands, and ensure the selectivity of the receiving system; the mixer mixes the received RF signal with the local oscillation signal, and converts the RF signal into an intermediate frequency signal for subsequent processing; the intermediate frequency processing unit is used to amplify, filter and demodulate the signals received by the receiving antenna and the RF front end.

[0013] Preferably, the time synchronization unit includes a time server and a client, the output end of the time server is electrically connected to the input end of the synchronization module, the output end of the synchronization module is electrically connected to the input end of the time information distribution module, the output end of the client is electrically connected to the input end of the classification module, and the output end of the classification module is electrically connected to the input end of the protocol mode selection module;

[0014] The time server is used to provide the most original accurate time information, to obtain accurate time from a time source, and then distribute the time information to other devices through a network protocol. The client is a terminal of a time synchronization unit, and is used to receive the time synchronization information sent by the time server and adjust its own time according to the information.

[0015] A simulation design system for network radio, using a network radio multi-point time difference positioning system as described in any one of claims 1 to 4, comprising a simulation design unit, wherein the simulation design unit comprises a scene construction unit, a data processing and analysis unit, a signal propagation model unit and a time difference measurement and positioning algorithm unit;

[0016] The scenario construction unit is used to create different types of geographic scenarios according to needs, the data processing and analysis unit is used to process and analyze the received data, the signal propagation model unit is used to simulate the propagation of radio signals in an ideal obstacle-free space, and the time difference measurement and positioning algorithm unit is used to simulate the time difference measurement process in an actual system based on the time when the signal arrives at different receiving points calculated by the signal propagation model.

[0017] Preferably, the scene construction unit includes a geographic environment modeling module and a target and receiving point arrangement module, the output end of the geographic environment modeling module is electrically connected to the input end of the propagation path detection module, and the output end of the target and receiving point arrangement module is electrically connected to the input end of the positioning module, the motion trajectory setting module and the target simulation module;

[0018] The geographic environment modeling module models the environments of cities, mountains and plains based on demand. The propagation path detection module is used to detect the propagation path of radio signals based on the distribution, height and material of buildings. The target and receiving point layout module is used to set the target's position, movement trajectory and distribution of multiple receiving points. The receiving points can be located at different heights and terrain positions to simulate the actual distributed network layout. The target can be simulated as a radio signal transmission source, and its transmission power and signal frequency are set according to demand.

[0019] Preferably, the output end of the data processing and analysis unit is electrically connected to the input end of the data collection module, the output end of the data collection module is electrically connected to the input end of the data storage module and the performance evaluation index calculation module, and the output end of the performance evaluation index calculation module is electrically connected to the input end of the visualization sharing module;

[0020] The data collection module is used to collect relevant data including target position, receiving point data, signal propagation parameters, time difference measurement values, and positioning results. The data storage module is used to store these data in a database. The performance evaluation index calculation module is used to calculate various performance evaluation indicators, including but not limited to positioning accuracy, root mean square error, and positioning success rate. The visualization sharing module is used to present the simulation results in a graphical manner, including but not limited to drawing a comparison chart of the target's actual trajectory and positioning trajectory, a positioning error distribution histogram, and a positioning accuracy change curve under different parameters.

[0021] Preferably, the output end of the signal propagation model unit is electrically connected to the input ends of the free space propagation model, the multipath propagation module and the shadow fading model;

[0022] The free space propagation model is used to simulate the propagation of radio signals in an ideal obstacle-free space, and calculates the attenuation and arrival time of the signal in free space based on the signal's transmission power, frequency and the distance between the transmitting and receiving points; the multipath propagation module is used to consider the situation where the signal reaches the receiving point through multiple paths during the propagation process; the shadow fading model is used to simulate the random changes in signal strength caused by obstacles such as terrain and buildings, and describes the signal fading in a local area through a probability distribution function based on different geographical environment parameters and obstacle distribution.

[0023] Preferably, the output end of the time difference measurement and positioning algorithm unit is electrically connected to the input end of the positioning algorithm implementation module and the time difference measurement simulation module;

[0024] The time difference measurement simulation module is used to simulate the time difference measurement process in the actual system according to the time when the signal arrives at different receiving points calculated by the signal propagation model; the positioning algorithm implementation module includes a variety of common time difference positioning algorithms, including but not limited to Taylor series expansion algorithm and Chan algorithm, and calculates the position of the target based on the algorithm according to the time difference data obtained by simulated measurement and the position information of the receiving point.

[0025] Compared with the prior art, the present invention provides a network radio multi-point time difference positioning and simulation design system, which has the following beneficial effects:

[0026] 1. The network radio multi-point time difference positioning and simulation design system can determine the target's position in a network radio environment by using the time difference between target signals received by multiple receiving points. When the target transmits a radio signal, due to the different distances between each receiving point and the target, the time it takes for the signal to propagate to each receiving point is different. This system can calculate the target's position through a specific algorithm by accurately measuring these time differences and combining them with the known position information of the receiving point.

[0027] 2. The network radio multi-point time difference positioning and simulation design system provides a platform for researchers and engineers to analyze the impact of different factors on the accuracy and effect of time difference positioning by constructing virtual scenes, signal propagation models and positioning algorithms, thereby optimizing the actual positioning system design. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a system block diagram of a positioning unit of the present invention;

[0029] Figure 2 is a system block diagram of a radio signal receiving unit of the present invention;

[0030] Figure 3 is a system block diagram of a time synchronization unit of the present invention;

[0031] Figure 4 It is a system block diagram of the simulation design unit of the present invention. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] Embodiment 1:

[0034] like Figure 1-Figure 3 As shown, a network radio multi-point time difference positioning system includes a positioning unit, the positioning unit includes a radio signal receiving unit, a time synchronization unit, the output end of the time synchronization unit is electrically connected to the input end of the data processing unit, the output end of the data processing unit is electrically connected to the input end of the calculation unit, the input end of the time synchronization unit is electrically connected to the output end of the selection module, the input end of the selection module is electrically connected to the output end of the priority setting module, the output end of the priority setting module is electrically connected to the input end of the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module;

[0035] The radio signal receiving unit is used to receive the time receiving point of the radio signal, the time synchronization unit is used to ensure that each time receiving point works under the same time reference, the data processing unit is used to collect the signal time data of each receiving point and process it, the calculation unit calculates the target position based on the algorithm using the time difference data and the position information of the receiving point, the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module are used to measure the time difference, the priority setting module is used to set the priority of the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module, and the selection module selects the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module based on the priority.

[0036] The radio signal receiving unit includes a baseband processing unit and an intermediate frequency processing unit. The baseband processing unit includes a signal processing module. The output end of the signal processing module is electrically connected to the input end of the display module.

[0037] The baseband processing unit is used to process the demodulated baseband signal, including but not limited to decoding, error correction, demultiplexing of digital signals, channel decoding, and source decoding; amplification, shaping, and other processing of analog signals such as audio and video, so that the signal can be correctly played or displayed by the terminal device.

[0038] The input end of the intermediate frequency processing unit is electrically connected to the output end of the receiving antenna and the RF front end, and the output end of the intermediate frequency processing unit is electrically connected to the input end of the demodulation module, the signal strength enhancement module, the digital intermediate frequency processing module and the noise interference suppression module;

[0039] The receiving antenna is used to convert radio waves in space into electrical signals. The RF front end includes a low-noise amplifier, a filter, and a mixer. The low-noise amplifier is used to amplify the weak electrical signals received by the antenna while minimizing the noise introduced by itself to improve the signal-to-noise ratio of the signal; the filter is used to select the signal in the required frequency band and suppress interference signals in other frequency bands to ensure the selectivity of the receiving system; the mixer mixes the received RF signal with the local oscillation signal and converts the RF signal into an intermediate frequency signal for subsequent processing; the intermediate frequency processing unit is used to amplify, filter, and demodulate the signals received by the receiving antenna and the RF front end.

[0040] The time synchronization unit includes a time server and a client, the output end of the time server is electrically connected to the input end of the synchronization module, the output end of the synchronization module is electrically connected to the input end of the time information distribution module, the output end of the client is electrically connected to the input end of the classification module, and the output end of the classification module is electrically connected to the input end of the protocol mode selection module;

[0041] The time server is used to provide the most original and accurate time information, to obtain accurate time from the time source, and then distribute the time information to other devices through the network protocol. The client is the terminal of the time synchronization unit, which is used to receive the time synchronization information sent by the time server and adjust its own time according to this information.

[0042] Embodiment 2:

[0043] like Figure 4 As shown, a simulation design system for network radio includes a simulation design unit, which includes a scenario construction unit, a data processing and analysis unit, a signal propagation model unit, and a time difference measurement and positioning algorithm unit;

[0044] The scenario construction unit is used to create different types of geographic scenarios according to needs. The data processing and analysis unit is used to process and analyze the received data. The signal propagation model unit is used to simulate the propagation of radio signals in an ideal obstacle-free space. The time difference measurement and positioning algorithm unit is used to simulate the time difference measurement process in the actual system based on the time when the signal arrives at different receiving points calculated by the signal propagation model.

[0045] The scene construction unit includes a geographic environment modeling module and a target and receiving point arrangement module, wherein the output end of the geographic environment modeling module is electrically connected to the input end of the propagation path detection module, and the output end of the target and receiving point arrangement module is electrically connected to the input end of the positioning module, the motion trajectory setting module and the target simulation module;

[0046] The geographic environment modeling module models and processes the environments of cities, mountains, and plains based on needs. The propagation path detection module is used to consider the distribution, height, and material of buildings, and detect the propagation path of radio signals based on this. The target and receiving point layout module is used to set the target's position, movement trajectory, and distribution of multiple receiving points. The receiving points can be located at different heights and terrain positions to simulate the actual distributed network layout. The target can be simulated as a radio signal transmission source, and its transmission power and signal frequency are set according to needs.

[0047] The output end of the data processing and analysis unit is electrically connected to the input end of the data collection module, the output end of the data collection module is electrically connected to the input end of the data storage module and the performance evaluation index calculation module, and the output end of the performance evaluation index calculation module is electrically connected to the input end of the visualization sharing module;

[0048] The data collection module is used to collect relevant data including target position, receiving point data, signal propagation parameters, time difference measurement values, and positioning results. The data storage module is used to store these data in the database. The performance evaluation index calculation module is used to calculate various performance evaluation indicators, including but not limited to positioning accuracy, root mean square error, and positioning success rate. The visualization sharing module is used to present the simulation results in a graphical manner, including but not limited to drawing a comparison chart of the target's actual trajectory and positioning trajectory, a positioning error distribution histogram, and a positioning accuracy change curve under different parameters.

[0049] The output end of the signal propagation model unit is electrically connected to the input ends of the free space propagation model, the multipath propagation module and the shadow fading model;

[0050] The free space propagation model is used to simulate the propagation of radio signals in an ideal obstacle-free space. The signal attenuation and arrival time in free space are calculated based on the signal's transmission power, frequency, and the distance between the transmitting and receiving points. The multipath propagation module is used to consider the situation where the signal reaches the receiving point through multiple paths during the propagation process. The shadow fading model is used to simulate the random changes in signal strength caused by obstacles such as terrain and buildings. According to different geographical environment parameters and obstacle distribution, the probability distribution function is used to describe the signal attenuation in the local area.

[0051] The output end of the time difference measurement and positioning algorithm unit is electrically connected to the input end of the positioning algorithm implementation module and the time difference measurement simulation module;

[0052] The time difference measurement simulation module is used to simulate the time difference measurement process in the actual system based on the time when the signal arrives at different receiving points calculated according to the signal propagation model; the positioning algorithm implementation module includes a variety of common time difference positioning algorithms, including but not limited to the Taylor series expansion algorithm and the Chan algorithm, and calculates the position of the target based on the algorithm according to the time difference data obtained from the simulated measurement and the position information of the receiving point.

[0053] The network radio multi-point time difference positioning and simulation design system can determine the position of the target in a network radio environment by using the time difference of the target signal received by multiple receiving points. When the target transmits a radio signal, due to the different distances between each receiving point and the target, there are differences in the time it takes for the signal to propagate to each receiving point. This system can calculate the position of the target through a specific algorithm by accurately measuring these time differences and combining them with the known position information of the receiving point. By constructing virtual scenes, signal propagation models and positioning algorithms, it provides researchers and engineers with a platform to analyze the impact of different factors on the accuracy and effect of time difference positioning, thereby optimizing the actual positioning system design.

[0054] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A network radio multi-point time difference positioning system, comprising a positioning unit, characterized in that: The positioning unit includes a radio signal receiving unit and a time synchronization unit, the output end of the time synchronization unit is electrically connected to the input end of the data processing unit, the output end of the data processing unit is electrically connected to the input end of the calculation unit, the input end of the time synchronization unit is electrically connected to the output end of the selection module, the input end of the selection module is electrically connected to the output end of the priority setting module, and the output end of the priority setting module is electrically connected to the input ends of the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module; The radio signal receiving unit is used to receive the time receiving point of the radio signal, the time synchronization unit is used to ensure that each time receiving point works under the same time reference, the data processing unit is used to collect the signal time data of each receiving point and process it, the calculation unit calculates the target position based on the algorithm using the time difference data and the position information of the receiving point, the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module are used to measure the time difference, the priority setting module is used to set the priority of the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module, and the selection module selects the GPS timing receiving module, the network time protocol confirmation module and the precision time protocol confirmation module based on the priority.

2. A network radio multi-point time difference positioning system according to claim 1, characterized in that: The radio signal receiving unit includes a baseband processing unit and an intermediate frequency processing unit, the baseband processing unit includes a signal processing module, and the output end of the signal processing module is electrically connected to the input end of the display module; The baseband processing unit is used to process the demodulated baseband signal, including but not limited to decoding, error correction, demultiplexing of digital signals, channel decoding, and source decoding; amplification, shaping, and other processing of analog signals such as audio and video, so that the signal can be correctly played or displayed by the terminal device.

3. A network radio multi-point time difference positioning system according to claim 2, characterized in that: The input end of the intermediate frequency processing unit is electrically connected to the output end of the receiving antenna and the RF front end, and the output end of the intermediate frequency processing unit is electrically connected to the input end of the demodulation module, the signal strength enhancement module, the digital intermediate frequency processing module and the noise interference suppression module; The receiving antenna is used to convert radio waves in space into electrical signals. The RF front end includes a low-noise amplifier, a filter, and a mixer. The low-noise amplifier is used to amplify the weak electrical signal received by the antenna while minimizing the noise introduced by itself to improve the signal-to-noise ratio of the signal; the filter is used to select the signal of the required frequency band and suppress the interference signals of other frequency bands to ensure the selectivity of the receiving system; the mixer mixes the received RF signal with the local oscillation signal and converts the RF signal into an intermediate frequency signal for subsequent processing; The intermediate frequency processing unit is used to amplify, filter and demodulate the signals received by the receiving antenna and the radio frequency front end.

4. The network radio multi-point time difference positioning system according to claim 1, characterized in that: The time synchronization unit includes a time server and a client, the output end of the time server is electrically connected to the input end of the synchronization module, the output end of the synchronization module is electrically connected to the input end of the time information distribution module, the output end of the client is electrically connected to the input end of the classification module, and the output end of the classification module is electrically connected to the input end of the protocol mode selection module; The time server is used to provide the most original accurate time information, to obtain accurate time from a time source, and then distribute the time information to other devices through a network protocol. The client is a terminal of a time synchronization unit, and is used to receive the time synchronization information sent by the time server and adjust its own time according to the information.

5. A network radio simulation design system, using a network radio multi-point time difference positioning system as described in any one of the above claims, including a simulation design unit, characterized in that: The simulation design unit includes a scenario construction unit, a data processing and analysis unit, a signal propagation model unit and a time difference measurement and positioning algorithm unit; The scenario construction unit is used to create different types of geographic scenarios according to needs, the data processing and analysis unit is used to process and analyze the received data, the signal propagation model unit is used to simulate the propagation of radio signals in an ideal obstacle-free space, and the time difference measurement and positioning algorithm unit is used to simulate the time difference measurement process in an actual system based on the time when the signal arrives at different receiving points calculated by the signal propagation model.

6. A network radio simulation design system according to claim 5, characterized in that: The scene construction unit includes a geographic environment modeling module and a target and receiving point arrangement module, wherein the output end of the geographic environment modeling module is electrically connected to the input end of the propagation path detection module, and the output end of the target and receiving point arrangement module is electrically connected to the input end of the positioning module, the motion trajectory setting module and the target simulation module; The geographic environment modeling module models the environments of cities, mountains and plains based on demand. The propagation path detection module is used to detect the propagation path of radio signals based on the distribution, height and material of buildings. The target and receiving point layout module is used to set the target's position, movement trajectory and distribution of multiple receiving points. The receiving points can be located at different heights and terrain positions to simulate the actual distributed network layout. The target can be simulated as a radio signal transmission source, and its transmission power and signal frequency are set according to demand.

7. The network radio simulation design system according to claim 5, characterized in that: The output end of the data processing and analysis unit is electrically connected to the input end of the data collection module, the output end of the data collection module is electrically connected to the input end of the data storage module and the performance evaluation index calculation module, and the output end of the performance evaluation index calculation module is electrically connected to the input end of the visualization sharing module; The data collection module is used to collect relevant data including target position, receiving point data, signal propagation parameters, time difference measurement values, and positioning results. The data storage module is used to store these data in a database. The performance evaluation index calculation module is used to calculate various performance evaluation indicators, including but not limited to positioning accuracy, root mean square error, and positioning success rate. The visualization sharing module is used to present the simulation results in a graphical manner, including but not limited to drawing a comparison chart of the target's actual trajectory and positioning trajectory, a positioning error distribution histogram, and a positioning accuracy change curve under different parameters.

8. The network radio simulation design system according to claim 5, characterized in that: The output end of the signal propagation model unit is electrically connected to the input ends of the free space propagation model, the multipath propagation module and the shadow fading model; The free space propagation model is used to simulate the propagation of radio signals in an ideal obstacle-free space, and calculates the attenuation and arrival time of the signal in free space based on the signal's transmission power, frequency and the distance between the transmitting and receiving points; the multipath propagation module is used to consider the situation where the signal reaches the receiving point through multiple paths during the propagation process; the shadow fading model is used to simulate the random changes in signal strength caused by obstacles such as terrain and buildings, and describes the signal fading in a local area through a probability distribution function based on different geographical environment parameters and obstacle distribution.

9. The network radio simulation design system according to claim 5, characterized in that: The output end of the time difference measurement and positioning algorithm unit is electrically connected to the input end of the positioning algorithm implementation module and the time difference measurement simulation module; The time difference measurement simulation module is used to simulate the time difference measurement process in the actual system according to the time when the signal arrives at different receiving points calculated by the signal propagation model; the positioning algorithm implementation module includes a variety of common time difference positioning algorithms, including but not limited to Taylor series expansion algorithm and Chan algorithm, and calculates the position of the target based on the algorithm according to the time difference data obtained by simulated measurement and the position information of the receiving point.

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