CN219780402U - Ad hoc network system based on satellite time service - Google Patents
Ad hoc network system based on satellite time service Download PDFInfo
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- CN219780402U CN219780402U CN202320985894.9U CN202320985894U CN219780402U CN 219780402 U CN219780402 U CN 219780402U CN 202320985894 U CN202320985894 U CN 202320985894U CN 219780402 U CN219780402 U CN 219780402U
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Abstract
The utility model relates to the technical field of satellite time service, and discloses an ad hoc network system based on satellite time service, which comprises a satellite base station, an ad hoc network base station, a radio station and communication equipment; the communication equipment comprises a power amplifier module, a radio frequency module, a baseband board, a switch module, a power interface, a data exchange interface and a receiving and transmitting antenna interface; the satellite base station is in communication with the self-organizing network base station through a satellite module to carry out satellite time service, the receiving and transmitting module of the self-organizing network base station is in communication connection with the receiving and transmitting module of the radio station, and the radio station is in communication connection with the receiving and transmitting antenna interface of the communication equipment. The utility model can solve the problem that the time slot synchronization can not be carried out among the self-organizing network base stations.
Description
Technical Field
The utility model relates to the technical field of satellite time service, in particular to an ad hoc network system based on satellite time service.
Background
TDMA is an abbreviation for time division multiple access, a technique widely used in radio communications. By dividing one frequency band into a plurality of time slots, each time slot only allows one user to transmit data, thereby achieving the purpose that a plurality of users communicate on the same frequency band. Since only one user performs transmission and reception operations in one slot, if slot synchronization is not performed, different users simultaneously use the same slot, so that interference occurs, resulting in degradation of communication quality, and thus it is very important to perform slot synchronization.
Current radio communication devices mostly use infrastructure for signal transfer and slot synchronization. After disasters such as earthquakes, floods, and strong tropical storms, fixed communication network facilities may be destroyed or not work properly, and in such a requisite application scenario, a rapidly deployed emergency ad hoc network may be used instead of an infrastructure communication facility. However, in the same ad hoc network, the time slots are difficult to synchronize between the base stations, and the severe environment has offset influence on the crystal oscillator device of the ad hoc network equipment. Therefore, the problem that the time slot synchronization cannot be performed between the ad hoc network base stations needs to be solved.
Disclosure of Invention
The purpose of the utility model is that: the utility model provides an ad hoc network system based on satellite time service, which can solve the problem that time slot synchronization can not be carried out between ad hoc network base stations.
In order to achieve the above purpose, the present utility model provides an ad hoc network system based on satellite time service, which comprises a satellite base station, an ad hoc network base station, a radio station and a communication device; the communication equipment comprises a power amplifier module, a radio frequency module, a baseband board, a switch module, a power interface, a data exchange interface and a receiving and transmitting antenna interface; the satellite base station is in communication with the self-organizing network base station through a satellite module to carry out satellite time service, a receiving and transmitting module of the self-organizing network base station is in communication connection with a receiving and transmitting module of the radio station, the radio station is in communication connection with a receiving and transmitting antenna interface of the communication equipment, the radio station presumes an air transmission starting moment and adjusts a local clock edge through a computing unit decoding signaling, and the switch module comprises a satellite module used for synchronization, frequency calibration and time slot segmentation of the communication equipment.
In some embodiments, the ad hoc network base station receives a clock signal transmitted by the satellite base station to calibrate a time slot, and transmits a heartbeat packet including the synchronization time information to the radio station.
In some embodiments, the radio station distinguishes talkgroups through different time slots in the same frequency band after time synchronization is completed.
In some embodiments, the satellite module included in the switch module provides accurate pulses through Beidou/GPS dual mode positioning.
In some embodiments, the communication device further comprises a voltage controlled oscillator, a D/A converter, a delay, a 1/10M frequency divider.
In some embodiments, the satellite module included in the switch module receives the second pulse of the satellite base station, and performs second time service through phase detection, filtering, aging compensation, PI control, D/a conversion, frequency modulation, frequency division and time delay, so as to calibrate the crystal oscillator of the communication device.
Compared with the prior art, the ad hoc network system based on satellite time service has the beneficial effects that:
the self-organizing network system based on satellite time service completes synchronization among base stations in a satellite time service mode, and the requirement of same-frequency co-broadcasting on high precision of signal transmitting time is guaranteed; the communication equipment can perform time slot synchronization only by adding a corresponding satellite module; the communication equipment uses the crystal oscillator to generate frequency signals, the crystal oscillator can deviate along with the change of temperature and time, and the frequency deviation of the crystal oscillator can be calibrated by using a satellite time service mode, so that the frequency deviation is more effective compared with the traditional mode of solving the crystal oscillator deviation by using the communication network equipment.
Drawings
FIG. 1 is a block diagram of the constituent connections of an ad hoc network system based on satellite time service in accordance with an embodiment of the present utility model;
fig. 2 is a process of reducing latency for a radio station in accordance with an embodiment of the present utility model;
FIG. 3 is a process diagram of an ad hoc network base station using satellites for time service according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of crystal oscillator calibration performed by the communication device based on satellite time service according to an embodiment of the present utility model.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
As shown in fig. 1, an ad hoc network system based on satellite time service according to a preferred embodiment of the present utility model includes a satellite base station 1, an ad hoc network base station 2, a radio station 3, and a communication device 4; the communication equipment 4 comprises a power amplifier module, a radio frequency module, a baseband board, a switch module, a power interface, a data exchange interface and a receiving and transmitting antenna interface; the satellite base station 1 communicates with the ad hoc network base station 2 through a satellite module to carry out satellite time service, a transceiver module of the ad hoc network base station 2 is in communication connection with a transceiver module of the radio station 3, the radio station 3 is in communication connection with a transceiver antenna interface of the communication equipment 4, the radio station 3 presumes an air transmission starting moment and adjusts a local clock edge through a computing unit decoding signaling, and the switch module comprises a satellite module used for synchronization and frequency calibration and time slot segmentation of the communication equipment.
In a specific embodiment, the ad hoc network base station receives the clock signal transmitted by the satellite base station to calibrate the time slot, and issues a heartbeat packet including the synchronization time information to the radio station.
In a specific embodiment, the radio station distinguishes the talk group through different time slots in the same frequency band after time synchronization is completed.
In a specific embodiment, the satellite module included in the switch module provides accurate pulses through Beidou/GPS dual-mode positioning.
In a specific embodiment, the communication device further comprises a voltage controlled oscillator, a D/A converter, a delay device and a 1/10M frequency divider.
In a specific embodiment, the satellite module included in the switch module receives the second pulse of the satellite base station, and performs second time service through phase detection, filtering, aging compensation, PI control, D/a conversion, frequency modulation, frequency division and time delay, so as to calibrate the crystal oscillator of the communication device.
It should be noted that, each ad hoc network base station needs to have a function of receiving satellite time service signals: when the base station receives the satellite time service signal, the local clock is required to be synchronized according to the time service signal, and the time division multiple access mode is used for dividing the channels, so that the requirement on time precision is higher, and the receiver receives the satellite time service signal and has certain time delay, so that the receiver needs extremely high time service precision. The time service precision of the receiver is mainly influenced by the characteristics of crystal oscillator, clock compensation characteristics of the receiver and positioning precision characteristics, and a satellite module adopted by the system has the function of eliminating satellite clock error; after synchronizing the local clock, the ad hoc network base station needs to broadcast heartbeat packet data to the radio station, wherein the heartbeat packet data comprises a synchronizing message for informing the radio station of the current time of the radio station; the delay exists in the process of transmitting the heartbeat packet by the ad hoc network base station, the delay cannot be avoided, but the error on the time slot caused by the delay can be reduced by using a delay estimation mode: the signal transmitted by the ad hoc network base station terminal in the air carries a time slot mark, and the radio station performs clock calibration according to the received heartbeat packet data, and the calibration process is divided into two steps: after the signaling is decoded, the starting moment of signal transmission in the air is estimated according to the time of the decoded signaling, the clock is adjusted to be the edge consistent with the base station, the edge adjustment ensures that the receiving end is consistent with the edge of the main transmitting end, and the tiny error of the local clock of the radio station is eliminated; and unifying time slot marks according to the time slot numbers in the signaling, and ensuring that the correct time slots are used for forwarding logic services. Thereby realizing the consistent time of the transmitting end and the receiving end. The method can reduce the error to nanosecond level, and meets the communication requirement of direct time division multiple access of the ad hoc network.
After receiving the synchronization message, the radio station needs to synchronize its own clock according to the clock information in the message, and when all radio stations complete clock synchronization, the radio station can communicate according to the time slot sequence agreed in advance, so as to avoid time slot conflict and interference.
When the crystal oscillator of the communication device is inaccurate, communication errors and instability may result. In order to ensure accurate and stable communication, the crystal oscillator must be calibrated. The process of calibrating the crystal oscillator by using the satellite time service system is as follows: the receiving and transmitting module acquires accurate time information by utilizing satellite time service signals; comparing the acquired satellite time information with the actual time in the communication equipment, and adjusting the frequency of the crystal oscillator according to the comparison result until the frequency is calibrated to a more accurate level; since the crystal oscillator in the communication device gradually drifts with the use time, calibration is required periodically to ensure the reliability of communication.
In summary, the ad hoc network system based on satellite time service provided by the embodiment of the utility model completes synchronization between base stations in a satellite time service mode, thereby ensuring the high precision requirement of co-frequency co-broadcasting on signal transmitting time; the communication equipment can perform time slot synchronization only by adding a corresponding satellite module; the communication equipment uses the crystal oscillator to generate frequency signals, the crystal oscillator can deviate along with the change of temperature and time, and the frequency deviation of the crystal oscillator can be calibrated by using a satellite time service mode, so that the frequency deviation is more effective compared with the traditional mode of solving the crystal oscillator deviation by using the communication network equipment.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.
Claims (6)
1. An ad hoc network system based on satellite time service is characterized by comprising a satellite base station, an ad hoc network base station, a radio station and communication equipment; the communication equipment comprises a power amplifier module, a radio frequency module, a baseband board, a switch module, a power interface, a data exchange interface and a receiving and transmitting antenna interface; the satellite base station is in communication with the self-organizing network base station through a satellite module to carry out satellite time service, a receiving and transmitting module of the self-organizing network base station is in communication connection with a receiving and transmitting module of the radio station, the radio station is in communication connection with a receiving and transmitting antenna interface of the communication equipment, the radio station presumes an air transmission starting moment and adjusts a local clock edge through a computing unit decoding signaling, and the switch module comprises a satellite module used for synchronization, frequency calibration and time slot segmentation of the communication equipment.
2. The satellite time service based ad hoc network system according to claim 1, wherein: and the self-organizing network base station receives the clock signal transmitted by the satellite base station to calibrate the time slot and transmits a heartbeat packet containing synchronous time information to the radio station.
3. An ad hoc network system based on satellite time service according to claim 1 or 2, wherein: the radio station distinguishes the talk groups through different time slots in the same frequency band after time synchronization is completed.
4. The satellite time service-based ad hoc network system according to claim 1, wherein the satellite module included in the switch module provides accurate pulses through Beidou/GPS dual mode positioning.
5. The satellite time service based ad hoc network system according to claim 1, wherein said communication device further comprises a voltage controlled oscillator, a D/a converter, a delay, a 1/10M frequency divider.
6. The satellite time service-based ad hoc network system according to claim 1, wherein said switch module comprises a satellite module for receiving the second pulse of said satellite base station and performing the second time service through the processes of phase detection, filtering, aging compensation, PI control, D/a conversion, frequency modulation, frequency division and time delay, and calibrating the crystal oscillator of said communication device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320985894.9U CN219780402U (en) | 2023-04-25 | 2023-04-25 | Ad hoc network system based on satellite time service |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320985894.9U CN219780402U (en) | 2023-04-25 | 2023-04-25 | Ad hoc network system based on satellite time service |
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| CN219780402U true CN219780402U (en) | 2023-09-29 |
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