CN215986510U - Five-position ten-channel virtual satellite generating device - Google Patents
Five-position ten-channel virtual satellite generating device Download PDFInfo
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- CN215986510U CN215986510U CN202122098960.4U CN202122098960U CN215986510U CN 215986510 U CN215986510 U CN 215986510U CN 202122098960 U CN202122098960 U CN 202122098960U CN 215986510 U CN215986510 U CN 215986510U
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Abstract
The utility model discloses a five-position ten-channel virtual satellite generating device which comprises a time-frequency and ephemeris synchronization module, five virtual position GNSS signal generating modules, a ten-channel up-conversion module and a power supply module, wherein the five virtual position GNSS radio frequency signals are generated by utilizing time and ephemeris information synchronized with GNSS, the GNSS radio frequency signals at five different positions comprise one path of positionable virtual satellite radio frequency signals, virtual satellite signals with fixed pseudo-range and the other path of virtual satellite signals with fixed pseudo-range. The utility model has the characteristics of small volume and multiple ports, and can cover the tunnel length of 2.5 kilometers by one device when being applied to positioning in the tunnel.
Description
Technical Field
The utility model belongs to the technical field of navigation simulation, and particularly relates to a five-position ten-channel virtual satellite generating device.
Background
In recent years, various indoor positioning technologies are proposed and applied to relevant scenes, such as technologies of RFID, WIFI, UWB ultra wide band, pseudolite and the like, wherein a set of positioning system needs to be reconstructed for the RFID, WIFI and UWB ultra wide band positioning, the cost is high, the positioning of the navigation receiver cannot be realized, and the pseudolite technology is seriously influenced by near-far effect and multipath effect and is not suitable for tunnel positioning.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a five-position ten-channel virtual satellite generating device, so that the defects in the prior art are overcome.
The technical scheme of the utility model is that the device comprises a time-frequency and ephemeris synchronization module, five virtual position GNSS signal generation modules, a ten-channel up-conversion module and a power module;
the time-frequency and ephemeris synchronization module and the five virtual position GNSS signal generation modules are sequentially connected with the ten-channel up-conversion module;
the power supply module is respectively connected with the time-frequency and ephemeris synchronization module, the five virtual position GNSS signal generation modules and the ten-channel up-conversion module and supplies power.
The time-frequency and ephemeris synchronization module is responsible for time-scale signal distribution and management of the whole system, and ensures that the time-frequency and ephemeris information of the whole device is synchronized with a real satellite after acquiring UTC time and ephemeris information.
The five virtual position GNSS signal generation modules mainly complete generation of five simulated intermediate frequency signals at different positions, and ten paths of intermediate frequency signals are required to be simulated simultaneously.
The five virtual position GNSS signal generation modules mainly comprise a CPCI interface, a DSP module, an FPGA module and a DAC module which are connected in sequence; the CPCI interface is used for receiving a synchronous signal and a clock signal, the DSP module carries out signal parameter calculation according to data issued by the CPCI interface, issues the data to the FPGA module and receives reported information of the FPGA module at the same time, the FPGA module completes dynamic pseudo code spreading, dynamic Doppler modulation and multipath signal generation according to the signal parameters and completes message and dynamic parameter data caching and modulation at the same time, and the DAC module converts a digital intermediate frequency signal output by the FPGA module into an analog intermediate frequency signal and outputs the analog intermediate frequency signal.
The ten-channel up-conversion module up-converts ten paths of analog intermediate frequency signals generated by the signal generation unit into navigation radio frequency signals, each path of intermediate frequency signals is distributed with an up-conversion channel to generate five GNSS radio frequency signals at different positions, and the GNSS radio frequency signals at each position comprise one path of positionable virtual satellite radio frequency signals, one path of fixed pseudo-range virtual satellite signals and the other path of fixed pseudo-range virtual satellite signals.
The power module continuously supplies power to the whole device, and converts the externally input 220V alternating voltage into direct voltage for output.
The utility model has the following advantages: 1. unlike other analog GNSS signal generators, in addition to outputting real visible satellite analog signals, virtual satellite signals containing fixed pseudoranges may be output for accurate position correction. 2. The whole device has the characteristics of small volume and multiple channels, and can cover the tunnel length of 2.5 kilometers by using the device for positioning in the tunnel. 3. An indoor virtual satellite positioning system is formed by combining a time service receiver, a receiving antenna, a leaky cable and an integrated accessory, seamless high-precision positioning inside and outside a tunnel is achieved, and therefore the problems that GNSS signals in the tunnel are attenuated, positioning precision is low and a navigation receiving terminal is not compatible can be solved.
Drawings
FIG. 1 is a block diagram of the present invention.
FIG. 2 is a block diagram of five virtual position GNSS signal generation modules.
Fig. 3 is a schematic diagram of the application of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The utility model will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The embodiments of the present invention will be described with reference to fig. 1 to 3, as shown in fig. 1, including a time-frequency and ephemeris synchronization module 1, five virtual position GNSS signal generation modules 2, a ten-channel up-conversion module 3, and a power supply module 4;
the time-frequency and ephemeris synchronization module 1, the five virtual position GNSS signal generation modules 2 and the ten-channel up-conversion module 3 are sequentially connected;
the power module 4 is respectively connected with the time-frequency and ephemeris synchronization module 1, the five virtual position GNSS signal generation modules 2 and the ten-channel up-conversion module 3 and supplies power.
The time-frequency and ephemeris synchronization module 1 is responsible for time-scale signal distribution and management of the whole system, and ensures that the time-frequency and ephemeris information of the whole device is synchronized with a real satellite after acquiring UTC time and ephemeris information.
The five virtual position GNSS signal generation modules 2 mainly complete generation of five simulated intermediate frequency signals at different positions, and need to simultaneously simulate ten paths of intermediate frequency signals.
The five virtual position GNSS signal generating modules 2 mainly comprise a CPCI interface 21, a DSP module 22, an FPGA module 23 and a DAC module 24 which are connected in sequence; the CPCI interface 21 is configured to receive (board card) synchronization signals and clock (time frequency) signals, the DSP module 22 performs signal parameter calculation according to data issued by the CPCI interface 21, issues the signal parameter calculation to the FPGA module 23, and receives report information of the FPGA module 24, the FPGA module 24 completes dynamic pseudo code spreading, dynamic doppler modulation, and multipath signal generation according to the signal parameters, and completes text and dynamic parameter data caching and modulation, and the DAC module 24 converts digital intermediate frequency signals output by the FPGA module 23 into analog intermediate frequency signals and outputs the analog intermediate frequency signals.
The ten-channel up-conversion module 3 up-converts ten paths of analog intermediate frequency signals generated by the signal generation unit to navigation radio frequency signals, each path of intermediate frequency signals is allocated with an up-conversion channel to generate five GNSS radio frequency signals at different positions, and the GNSS radio frequency signals at each position comprise one path of positionable virtual satellite radio frequency signals, one path of virtual satellite signals with fixed pseudo-range and the other path of virtual satellite signals with fixed pseudo-range.
Specifically, the positionable virtual satellite radio frequency signals are all visible satellite signals at the current simulation time at the position corresponding to the position point coordinates, the simulated satellite signals of the fixed pseudo-range have the same power and different satellite numbers, and the health control words in the telegraph text are set to be unhealthy and do not participate in positioning calculation.
According to one embodiment of the present invention, the power module 4 continuously supplies power to the whole device, and converts the externally input 220V ac voltage into a dc voltage for output.
According to an embodiment of the utility model, the virtual satellite radio frequency signals of each position output by the five-position ten-channel virtual GNSS signal generation device are used for rough position solution in the tunnel, and two paths of virtual satellite signals with fixed pseudo ranges are used for precise position correction.
Fig. 3 is a schematic diagram illustrating the principle of indoor virtual satellite navigation positioning according to an embodiment of the present invention. The system is used for positioning in a tunnel of 2.5 kilometers and is divided into 5 areas, 5 leaky cables of 500 meters are distributed in each area along the direction of the tunnel, and output signals of five-position ten-channel virtual GNSS signal generating devices are respectively connected to the near end and the far end of each leaky cable (the virtual GNSS signal generating devices are used as reference points).
A time service receiver in the system receives outdoor real satellite signals, calculates UTC time and real ephemeris information and transmits the UTC time and the real ephemeris information to a five-position ten-channel virtual GNSS signal generating device, the five-position ten-channel virtual GNSS signal generating device generates GNSS radio frequency signals of five positions by using real ephemeris and coordinates of any point in the center of a current leaky cable after being synchronized with the real satellite signals in time, each position signal comprises a path of first virtual satellite signal for rough position positioning and a path of second virtual satellite signal for fine position adjustment, and the other path of third virtual satellite signal for fine position adjustment, the first virtual satellite signal and the second virtual satellite signal are connected to a near port of each section of leaky cable for radiation, the other path of the third virtual satellite signal is connected to a far port of each section of leaky cable through an optical fiber and an optical-electrical conversion module for radiation, when a user passes below the leaky cable, the navigation receiver receives the first virtual satellite signal to perform positioning calculation, and then obtains the coordinates in the WGS84 geodetic coordinate system by using the pseudo-range difference between the second virtual satellite signal and the third virtual satellite signal.
The utility model provides a five-position ten-channel virtual GNSS signal generating device for tunnel positioning based on an indoor virtual satellite positioning method, and combines a time service receiver, a receiving antenna, a leaky cable and an integrated accessory to form a low-cost indoor positioning system, which can cover the tunnel length of 2.5 kilometers and realize high-precision positioning in the tunnel.
It will be clear that the described embodiments are preferred embodiments of the utility model and are not intended to limit the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (6)
1. The five-position ten-channel virtual satellite generation device is characterized by comprising a time-frequency and ephemeris synchronization module, five virtual position GNSS signal generation modules, a ten-channel up-conversion module and a power supply module;
the time-frequency and ephemeris synchronization module and the five virtual position GNSS signal generation modules are sequentially connected with the ten-channel up-conversion module;
the power supply module is respectively connected with the time-frequency and ephemeris synchronization module, the five virtual position GNSS signal generation modules and the ten-channel up-conversion module and supplies power.
2. The five-position ten-channel virtual satellite generating apparatus of claim 1,
the time-frequency and ephemeris synchronization module is responsible for time-scale signal distribution and management of the whole system, and ensures that the time-frequency and ephemeris information of the whole device is synchronized with a real satellite after acquiring UTC time and ephemeris information.
3. The five-position ten-channel virtual satellite generating apparatus of claim 1,
the five virtual position GNSS signal generation modules mainly complete generation of five simulated intermediate frequency signals at different positions, and ten paths of intermediate frequency signals are required to be simulated simultaneously.
4. The five-position ten-channel virtual satellite generating apparatus of claim 3,
the five virtual position GNSS signal generation modules mainly comprise a CPCI interface, a DSP module, an FPGA module and a DAC module which are connected in sequence; the CPCI interface is used for receiving a synchronous signal and a clock signal, the DSP module carries out signal parameter calculation according to data issued by the CPCI interface, issues the data to the FPGA module and receives reported information of the FPGA module at the same time, the FPGA module completes dynamic pseudo code spreading, dynamic Doppler modulation and multipath signal generation according to the signal parameters and completes message and dynamic parameter data caching and modulation at the same time, and the DAC module converts a digital intermediate frequency signal output by the FPGA module into an analog intermediate frequency signal and outputs the analog intermediate frequency signal.
5. The five-position ten-channel virtual satellite generating apparatus of claim 1,
the ten-channel up-conversion module up-converts ten paths of analog intermediate frequency signals generated by the signal generation unit into navigation radio frequency signals, each path of intermediate frequency signals is distributed with an up-conversion channel to generate five GNSS radio frequency signals at different positions, and the GNSS radio frequency signals at each position comprise one path of positionable virtual satellite radio frequency signals, one path of fixed pseudo-range virtual satellite signals and the other path of fixed pseudo-range virtual satellite signals.
6. The five-position ten-channel virtual satellite generating apparatus of claim 1,
the power module continuously supplies power to the whole device, and converts the externally input 220V alternating voltage into direct voltage for output.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113640835A (en) * | 2020-05-10 | 2021-11-12 | 张勇虎 | Indoor virtual satellite navigation positioning method, system and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113640835A (en) * | 2020-05-10 | 2021-11-12 | 张勇虎 | Indoor virtual satellite navigation positioning method, system and device |
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