CN211184264U - Positioning base station - Google Patents

Abstract

The utility model provides a location basic station, include: the device comprises a main control module, a baseband module, a communication module, a synchronization module and a power supply module; the master control module is respectively connected with the baseband module, the communication module and the power supply module; the power supply module is connected with the main control module and the baseband module; the baseband module is connected with the main control module, the power supply module and the synchronization module. In the utility model, the user can obtain high-precision positioning signals; the base station can generate 1 or 2 paths of positioning signals, so that the implementation cost can be reduced in medium and small scenes; the nanosecond-level high-precision time synchronization is realized between the positioning base stations in a mode of the atomic clock common-view satellite or optical fiber interconnection; the radio frequency output power can be adjusted to meet various application scenes; in addition, the base station also provides equipment power-on self-test and gives prompt and alarm in real time; and provide 10MHz reference signal, 1PPS monitoring output externally, facilitate users to detect the running state of the base station.

Description

Positioning base station

Technical Field

The utility model belongs to the technical field of communication, concretely relates to location basic station.

Background

Currently, outdoor positioning is basically implemented by satellite-based positioning technology, such as Global Positioning System (GPS) in the united states, global navigation satellite System (G L OBA L navinformation LL ITE SYSTEM, abbreviated G L ONASS) in russia, BeiDou navioningalite System (BDS) in china, and Galileo satellite navigation System (Galileo satellite navigation System) in europe.

In addition, the demand of indoor user to communication network is also very high, user terminal needs different functional module, like wiFi module, bluetooth module etc. to real-time transmission data information, and each module dispersion is laid, both taken great indoor space, extravagant hardware cost, be unfavorable for the user to the management of each equipment again, how to improve equipment integration, can enough realize indoor location accurately, can reduce equipment cost again, make things convenient for equipment maintenance and management, become the problem that technical staff in the field await the solution urgently.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model is realized through the following technical scheme.

Specifically, the utility model provides a location basic station, include: the device comprises a main control module, a baseband module, a communication module, a synchronization module and a power supply module; the master control module is respectively connected with the baseband module, the communication module and the power supply module; the power supply module is connected with the main control module and the baseband module; the baseband module is connected with the main control module, the power supply module and the synchronization module.

Further, the baseband module is a TC-OFDM baseband module.

Further, the baseband module comprises a radio frequency daughter board.

Furthermore, the main control module is an industrial-grade embedded computer.

Further, the baseband module includes: the system comprises an FPGA, a clock modulation circuit, a mixing circuit, a transmitting local oscillator and a radio frequency daughter board; the FPGA is connected with the clock modulation circuit and the mixing circuit, the transmitting local oscillator is connected between the clock modulation circuit and the mixing circuit, and the mixing circuit is further connected with the radio frequency sub-board.

Further, the radio frequency daughter board comprises a digital-to-analog converter, a radio frequency unit, a gain amplifier and a power amplifier which are connected in series.

Furthermore, the FPGA adopts a Xilinx Kintex-7 FPGA and further comprises a 1PPS input interface, a 1PPS output interface, a general I/O interface, a gigabit Ethernet interface, a memory interface and a flash memory physical interface.

Further, the communication module adopts an RFC33A module containing an nRF905 chip.

Further, the nRF905 chip is a short-range wireless communication chip, and a frequency synthesizer, a power amplifier, a crystal oscillator, and a modulator are built in the nRF905 chip.

Further, the synchronization module adopts one of the following three ways: the system comprises an ad hoc network channel wireless time synchronization module, a Beidou/GPS satellite common-view time synchronization module and an optical fiber time synchronization module.

The utility model has the advantages that: in the utility model, the user can obtain high-precision positioning signals; the base station can generate 1 or 2 paths of positioning signals, so that the implementation cost can be reduced in medium and small scenes; the nanosecond-level high-precision time synchronization is realized between the positioning base stations in a mode of the atomic clock common-view satellite or optical fiber interconnection; the radio frequency output power can be adjusted to meet various application scenes; in addition, the base station also provides equipment power-on self-test and gives prompt and alarm in real time; and provide 10MHz reference signal, 1PPS monitoring output externally, facilitate users to detect the running state of the base station.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic diagram of a hardware structure of a positioning base station according to an embodiment of the present invention;

fig. 2 shows a hardware structure diagram of a baseband module according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Fig. 1 is a schematic structural diagram of a positioning base station according to an embodiment of the present invention; as shown in fig. 1, the positioning base station of the present invention includes: the device comprises a main control module, a baseband module, a communication module, a synchronization module and a power supply module; the master control module is respectively connected with the baseband module, the communication module and the power supply module; the power supply module is connected with the main control module and the baseband module; the baseband module is connected with the main control module, the power supply module and the synchronization module. The baseband module is a TC-OFDM baseband module. The baseband module comprises a radio frequency daughter board to send out radio frequency signals. Ups (uniterrupted Power supply), which is an uninterruptible Power supply, provides backup Power for the Power modules. The external air pressure module collects environmental air pressure information.

TC-OFDM (Time Code Division-Orthogonal Frequency Division multiplexing), just-in-Time Division-coded Orthogonal Frequency Division multiplexing.

The main modules of the positioning base station are composed and have the following functions:

(1) main control module

The base station configuration information is stored, after the base station configuration information is started, the external air pressure module is used for acquiring environmental air pressure information regularly, the high-speed network port is used for communicating with the baseband module in real time, and the base station configuration information controls operation, issues data, acquires state information and gives an alarm. And an external interface is provided for operators to check the running state and function debugging of the base station.

The utility model discloses a master control module hardware selects the industrial grade embedded computer (MIO-5251J) that stability, scalability are very strong, has the multiple advantage of embedded single board computer and modularization computer. Not only can be used independently as a single-board computer, but also can be elastically extended to have more I/O functions through an expansion interface of the MIOe. Meanwhile, the structure and the heat dissipation are optimized more and more, so that the integration of the system is facilitated; and a uniform MIOe interface is configured, and a more flexible customized I/O module can be expanded through the MIOe interface.

The main control module is initialized after being powered on and started, and then sends an interaction command to the baseband module through the high-speed network interface; after the command is successfully sent, receiving power-on detection information of the baseband module, and judging whether the state of the baseband module is normal or not; reading local system configuration information and sending the local system configuration information to a baseband module after the local system configuration information is normal, periodically detecting a baseband board data frame in the period, and sending base station state information to a service platform; configuration information and power and frequency adjustment commands can be issued through the service platform in the working process, the main control module stores and updates local configuration information after receiving the commands, and sends power and frequency adjustment commands to the baseband module; in the working process of the base station, a manager can send a debugging command through a local network port or a console port and inquire the current working state, debugging information and telegraph text of the base station so as to facilitate debugging and fault repair.

(2) Baseband module

As shown in FIG. 2, the hardware structure of the baseband module of the present invention comprises an FPGA, a clock modulation circuit, a mixing circuit, a transmitting local oscillator (TX L O), and a radio frequency daughter board (including a digital-to-analog converter DAC, a radio frequency unit RF, a gain and a power amplifier PA), wherein the FPGA is connected with the clock modulation circuit and the mixing circuit, the transmitting local oscillator is connected between the clock modulation circuit and the mixing circuit, and the mixing circuit is further connected with the radio frequency daughter board.

The utility model discloses a FPGA adopts and is based on Xilinx Kintex-7 FPGA, further has 1PPS input interface, 1PPS output interface, general IO interface (GPIO), gigabit Ethernet interface, memory interface (connect DDR3 SDRAM), flash memory physical interface (PHY, connect flash memory flash).

The utility model discloses a baseband module receives configuration and the environmental data that master control module provided, modulates TC-OFDM telegraph text signal and realizes DAC, enlargies the output through the radio frequency daughter board. The baseband module can feed back the internal state information to the main control module through the interface.

Based on the Xilinx Kintex-7 FPGA, the high-performance digital signal processing capability is provided, the signal processing and phase synchronization calibration of 40MHz bandwidth are supported, and the frequency covers 10 MHz-6 GHz.

And a high-speed data transmission interface between the main control module and the main control module is provided, so that high-speed real-time data transmission is ensured.

Through the external 10MHz reference clock signal and the 1PPS signal, nanosecond clock synchronization can be realized. Meanwhile, a high-precision clock reference can be provided for an external third-party communication system (such as a 4G emergency private network base station and the like).

(3) Communication module

The utility model discloses a communication module adopts the RFC33A module that contains the nRF905 chip. The RFC33A module is embedded with an nRF905 single-chip radio frequency transceiver chip, and the working frequency of the nRF905 single-chip radio frequency transceiver chip is in an ISM frequency band of 433/868/915 MHz. The nRF905 chip is a Nordic short-range wireless communication chip, and functional modules such as a frequency synthesizer, a power amplifier, a crystal oscillator, a modulator and the like are built in the Nordic short-range wireless communication chip. The short-distance wireless communication can be realized only by programming and configuring the chip output power and the communication channel. Secondly, the whole power consumption of the chip is low, for example, when the chip is transmitted with the power of 10dBm, the working current is only 30 mA; the current in standby mode is only 12.5 mua. The ShockBurst technology arranged in the chip can automatically generate a lead code and CRC check bits during communication. The RFC33A module adds a power amplifier circuit to the peripheral circuit of the original nRF905 to increase the transmission power (about 2W at 33 dBm), so that the actual communication distance reaches more than 2000 m.

The utility model discloses a communication module realizes and positioning terminal's narrowband long distance communication, gathers the locating information that positioning terminal reported to pass back to command center through the high-speed channel.

The communication module plays a role of data conversion and relay in the whole positioning system. The communication module can be controlled by two MCUs, and each MCU is specially used for controlling one wireless module. One MCU controls the sending module to send broadcast signals continuously; and the other MCU receives the terminal return signal through the receiving module. The wireless transceiving function of the communication module in the scheme is formed by two wireless modules independently and continuously works in the same state, so that the time for switching the transceiving function is shortened, and the probability of data missing transmission and data missing reception is reduced. Meanwhile, the positioning terminal can be in a timing monitoring state, and whether broadcast signals exist around is monitored only at intervals, so that the positioning terminal is in a low-power consumption state for a long time, and the time of endurance work of the positioning terminal is guaranteed.

The terminal communication module broadcasts data information in a code division mode, the positioning base station decodes and uniformly packages data after receiving the position information returned by the terminal, and the data is returned to the command center server through communication links such as a mobile data network, an emergency communication network, satellite communication and the like.

(4) Synchronization module

The utility model discloses a synchronization module provides the high accuracy time synchronization between the different basic stations.

The synchronization module can adopt the following three different ways: the system comprises an ad hoc network channel wireless time synchronization module, a Beidou/GPS satellite common-view time synchronization module and an optical fiber time synchronization module. The former two can realize nanosecond synchronization, and the latter can reach sub-nanosecond synchronization precision.

The optical fiber time transmission technology utilizes the advantages of low loss, large bandwidth, high stability, low cost and the like of an optical fiber channel, and is the current highest-precision time transmission means.

The utility model discloses in, the user can set up location basic station serial number, and the electricity starts the back on the basic station, according to modulation TC-OFDM high accuracy positioning signal such as serial number, self positional information, the sensor data of collection of setting for, exports to the antenna feed system through front panel SMA interface. Aiming at the condition that the distance between two base stations in partial indoor scenes is not more than 200 meters, the base stations are designed to generate 1 or 2 paths of positioning signals, so that the implementation cost is reduced in small and medium scenes.

And nanosecond-level high-precision time synchronization is realized between the positioning base stations in a mode of common view of an atomic clock and a satellite or optical fiber interconnection.

In order to meet various application scenes, the radio frequency output is designed to be adjustable in output power, and the adjustment range is 0-31 dBm; the frequency of the central point of the output signal can be adjusted within the range of 400 MHz-1.8 GHz.

In addition, the base station also provides equipment power-on self-test and gives prompt and alarm in real time; and provide 10MHz reference signal, 1PPS monitoring output externally, facilitate users to detect the running state of the base station.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A positioning base station, comprising:

the device comprises a main control module, a baseband module, a communication module, a synchronization module and a power supply module;

the master control module is respectively connected with the baseband module, the communication module and the power supply module; the power supply module is connected with the main control module and the baseband module; the baseband module is connected with the main control module, the power supply module and the synchronization module.

2. A positioning base station according to claim 1,

the baseband module is a TC-OFDM baseband module.

3. A positioning base station according to claim 1,

the baseband module comprises a radio frequency daughter board.

4. A positioning base station according to claim 1,

the main control module is an industrial grade embedded computer.

5. A positioning base station according to claim 1,

the baseband module includes: the system comprises an FPGA, a clock modulation circuit, a mixing circuit, a transmitting local oscillator and a radio frequency daughter board; the FPGA is connected with the clock modulation circuit and the mixing circuit, the transmitting local oscillator is connected between the clock modulation circuit and the mixing circuit, and the mixing circuit is further connected with the radio frequency sub-board.

6. A positioning base station according to claim 5,

the radio frequency daughter board comprises a digital-to-analog converter, a radio frequency unit, a gain amplifier and a power amplifier which are connected in series.

7. A positioning base station according to claim 5,

the FPGA adopts a Xilinx Kintex-7 FPGA and further comprises a 1PPS input interface, a 1PPS output interface, a general I/O interface, a gigabit Ethernet interface, a memory interface and a flash memory physical interface.

8. A positioning base station according to claim 1,

the communication module adopts an RFC33A module containing an nRF905 chip.

9. A positioning base station according to claim 8,

the nRF905 chip is a short-distance wireless communication chip and internally provided with a frequency synthesizer, a power amplifier, a crystal oscillator and a modulator.

10. A positioning base station according to claim 1,

the synchronization module adopts one of the following three modes: the system comprises an ad hoc network channel wireless time synchronization module, a Beidou/GPS satellite common-view time synchronization module and an optical fiber time synchronization module.

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