CN113783681A - Novel high-precision system synchronization method - Google Patents
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Abstract
本发明提供一种新型的高精度系统同步方法，包括下列步骤：多个中继台同时接收来自终端的业务请求信息，基于业务请求信息在多个中继台中选择第一级中继台，所选择的第一中继台向第二级中继台转发相位同步序列信号，所述相位同步序列信号包括第一级中继台的相位信息；所述第二级中继台接收到相位同步序列信号后，依次进行场强判决、相位判决、相位同步，实现第二级中继台的相位校准；第二级中继台依次向多个第N级中继台转发相位同步序列信号，多个第N级中继台根据相位同步序列信号实现相位同步校准。
The present invention provides a novel high-precision system synchronization method, comprising the following steps: a plurality of relay stations simultaneously receive service request information from a terminal, and a first-level relay station is selected from the plurality of relay stations based on the service request information, The selected first repeater station forwards the phase synchronization sequence signal to the second level repeater station, the phase synchronization sequence signal includes the phase information of the first level repeater station; the second level repeater station receives the phase synchronization sequence After the signal, field strength judgment, phase judgment, and phase synchronization are performed in sequence to realize the phase calibration of the second-level repeater station; the second-level repeater station sequentially forwards the phase synchronization sequence signal to multiple Nth The N-th repeater station realizes the phase synchronization calibration according to the phase synchronization sequence signal.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a novel high-precision system synchronization method.
Background
The narrow-band communication system occupies narrow bandwidth and cannot carry out communication route maintenance in a real-time or heartbeat mode, so that the narrow-band communication networking is realized in a broadcast communication mode, each equipment terminal is autonomously synchronized to a corresponding base station when no communication service exists, and all base station equipment is synchronized to the corresponding base station initiated by the service as required when the service exists. The narrowband networking mode without the central station has good maneuverability and low system overhead, is widely applied to scenes of rescue and relief work, anti-terrorism maintenance, training exercises, army marching and the like, and provides trunking communication guarantee. At present, the narrowband networking communication without a central station of a digital cluster is mainly the networking communication of a handheld station, a vehicle-mounted station and a relay station, and the linear networking is realized, each node can only support one relay device, and the dynamic change of the network topology shape has a large influence on the communication; when a plurality of relay devices are close to each other, multi-carrier signal overlapping interference may be generated, which may cause poor communication effect or communication failure.
Disclosure of Invention
The present invention is directed to a novel high-precision system synchronization method to solve the above-mentioned problems in the background art.
The invention is realized by the following technical scheme: a novel high-precision system synchronization method comprises the following steps:
the method comprises the steps that a plurality of relay stations simultaneously receive service request information from a terminal, a first-stage relay station is selected from the relay stations based on the service request information, the selected first relay station forwards a phase synchronization sequence signal to a second-stage relay station, and the phase synchronization sequence signal comprises phase information of the first-stage relay station;
after receiving the phase synchronization sequence signal, the second-stage relay station sequentially performs field intensity judgment, phase judgment and phase synchronization to realize phase calibration of the second-stage relay station;
the second-stage relay station sequentially forwards the phase synchronization sequence signals to the Nth-stage relay stations, and the Nth-stage relay stations realize phase synchronization calibration according to the phase synchronization sequence signals.
Optionally, selecting a first-stage relay station from the plurality of relay stations based on the service request information includes:
after receiving the service request information, the relay station sends pre-sending information, and other relay stations receive the pre-sending information and continue to send the pre-sending information outwards, wherein the pre-sending information comprises received signal strength information and Beidou condition information;
a first-stage relay station is selected from the plurality of relay stations based on the pre-transmission information received by the plurality of relay stations.
Optionally, other relay stations of the phase synchronization sequence signal sent by the first-stage relay station are set as second-stage relay stations, and the number of the second-stage relay stations is n.
Optionally, the phase synchronization sequence signal further includes a level code, where the level code includes {1, 2., a }, where a is a constant.
Optionally, after the second-stage relay station performs field strength decision, phase decision, and phase synchronization in sequence according to the phase synchronization sequence signal, the method includes:
and the second-stage relay station judges the field strength of the received phase synchronization sequence signal, compares the phase information of the first-stage relay station with the phase information of the second-stage relay station if the signal strength is qualified, and modifies the phase information of the second-stage relay station according to the phase information of the first-stage relay station.
Optionally, before a plurality of relay stations receive service request information from a terminal at the same time, the relay stations continuously perform their own carrier calibration, where the process includes:
the relay station receives the Beidou time base signal and acquires the phase of the Beidou time base signal and the frequency of the temperature compensation crystal oscillator of the relay station;
and calibrating the self temperature compensation crystal oscillator frequency of the repeater by taking the Beidou time base signal as a standard, thereby realizing the carrier calibration of the repeater station and automatically generating control parameters according to the current working state.
Optionally, the method further comprises the step of calibrating the self and temperature compensation crystal oscillator frequency through the control parameters when the relay station cannot receive the Beidou time base signal.
Compared with the prior art, the invention has the following beneficial effects:
the novel high-precision system synchronization method provided by the invention has the advantages that multiple paths of signals are overlapped and combined, a narrow-band centerless ad hoc network is realized, dynamic and random changes of network topology are supported, relay communication cannot be influenced by the addition and the departure of any node, the problems of wireless interference and cascade when a plurality of relay stations are close to each other are effectively solved, the relay communication is promoted to be mesh communication from linear communication, and the communication cascade effect and the coverage distance are greatly improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a block diagram of a novel high-precision system synchronization method provided by the present invention;
fig. 2 is a schematic diagram of communication connection provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a subset of embodiments of the invention and not all embodiments of the invention, with the understanding that the invention is not limited to the example embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention described herein without inventive step, shall fall within the scope of protection of the invention.
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as 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 invention to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present invention, a detailed structure will be set forth in the following description in order to explain the present invention. Alternative embodiments of the invention are described in detail below, however, the invention may be practiced in other embodiments that depart from these specific details.
Referring to fig. 1-2, a novel high-precision system synchronization method includes the following steps:
s1, the multiple relay stations receive the service request information from the terminal at the same time, the first relay station is selected from the multiple relay stations based on the service request information, the selected first relay station forwards the phase synchronization sequence signal to the second relay station, and the phase synchronization sequence signal comprises the phase information of the first relay station;
s2, after receiving the phase synchronization sequence signal, the second-stage relay station sequentially performs field intensity judgment, phase judgment and phase synchronization to realize phase calibration of the second-stage relay station;
and S3, the second-stage relay station sequentially forwards the phase synchronization sequence signals to the multiple Nth-stage relay stations, and the multiple Nth-stage relay stations realize phase synchronization calibration according to the phase synchronization sequence signals.
Optionally, in an example of the present invention, selecting a first-stage relay station from a plurality of relay stations based on the service request information includes:
after receiving the service request information, the relay station sends pre-sending information, and other relay stations receive the pre-sending information and continue to forward the pre-sending information outwards, wherein the pre-sending information comprises received signal strength information and Beidou condition information;
a first-stage relay station is selected from the plurality of relay stations based on the pre-transmission information received by the plurality of relay stations.
Illustratively, when three relay stations simultaneously receive service request information of service from a terminal, the three relay stations simultaneously output pre-transmission information, and when the three relay stations simultaneously receive the pre-transmission information transmitted mutually, the three relay stations judge the pre-transmission signal and select a first-stage relay station from the three relay stations.
After setting a first-stage relay station, service information sent by a terminal is preferentially sent to the first-stage relay station for processing, the first-stage relay station forwards the service information and a phase synchronization sequence signal outwards, other relay stations receiving the signals are regarded as second-stage relay stations, at the moment, the second-stage relay station receives the phase synchronization sequence signal and then sequentially carries out field intensity judgment, phase judgment and phase synchronization to realize phase calibration of the second-stage relay station, and so on, the second-stage relay station forwards the phase synchronization sequence signal to a plurality of Nth-stage relay stations in sequence, and the plurality of Nth-stage relay stations realize phase synchronization calibration according to the phase synchronization sequence signal
It should be noted that the number of the first-stage relay stations can only be 1, and the number of the second-stage relay stations and the N-th-stage relay stations can be N. The same frequency and same phase of the relay station at the same level are transmitted, and the transmitted radio frequency signals are mixed in space, so that the transmission has the advantages that: (1) when the spatial transmission delay is less than 10us (the transmission distance difference is less than 3km), the signal strength is enhanced after the multi-channel radio frequency signals are superposed, the receiving error rate of a receiving party is improved, and the more the number of radio frequency signal paths is, the stronger the signal is, the more the signal is beneficial to receiving; when the spatial transmission delay is greater than 10us (the transmission distance difference is greater than 3km), according to the Okumura-Hata transmission model, the signal amplitude difference is greater than 6dB, and at this time, the influence of the small-amplitude signal on the reception is low.
Further, the phase synchronization sequence signal further includes a level code, where the level code includes {1, 2., a }, where a is a constant.
For example, the level code included in the phase synchronization sequence signal transmitted from the first-stage relay station is 1, and the level code included in the phase synchronization sequence signal transmitted from the second-stage relay station is 2
Further, after the second-stage relay station performs field intensity decision, phase decision and phase synchronization in sequence according to the phase synchronization sequence signal, the method includes:
and the second-stage relay station judges the field strength of the received phase synchronization sequence signal, compares the phase information of the first-stage relay station with the phase information of the second-stage relay station if the signal strength is qualified, and modifies the phase information of the second-stage relay station according to the phase information of the first-stage relay station.
Optionally, before a plurality of relay stations receive service request information from a terminal at the same time, the relay stations continuously perform their own carrier calibration, where the process includes:
the relay station receives the Beidou time base signal and acquires the phase of the Beidou time base signal and the phase of the temperature compensation crystal oscillator of the relay station;
and calibrating the phase of the temperature compensated crystal oscillator of the repeater by taking the Beidou time base signal as a standard, thereby realizing the carrier calibration of the repeater station and automatically generating control parameters according to the current working state.
Optionally, the method further comprises the step of calibrating the phase of the temperature compensation crystal oscillator by the control parameter when the relay station cannot receive the Beidou time base signal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A novel high-precision system synchronization method is characterized by comprising the following steps:
the method comprises the steps that a plurality of relay stations simultaneously receive service request information from a terminal, a first-stage relay station is selected from the relay stations based on the service request information, the selected first relay station forwards a phase synchronization sequence signal to a second-stage relay station, and the phase synchronization sequence signal comprises phase information of the first-stage relay station;
after receiving the phase synchronization sequence signal, the second-stage relay station sequentially performs field intensity judgment, phase judgment and phase synchronization to realize phase calibration of the second-stage relay station;
the second-stage relay station sequentially forwards the phase synchronization sequence signals to the Nth-stage relay stations, and the Nth-stage relay stations realize phase synchronization calibration according to the phase synchronization sequence signals.
2. The method of claim 1, wherein selecting the first relay station from the plurality of relay stations based on the service request information comprises:
after receiving the service request information, the relay station sends pre-sending information, and other relay stations receive the pre-sending information and continue to forward the pre-sending information outwards, wherein the pre-sending information comprises received signal strength information and Beidou condition information;
a first-stage relay station is selected from the plurality of relay stations based on the pre-transmission information received by the plurality of relay stations.
3. A novel high-precision system synchronization method as claimed in claim 1, wherein the other relay stations of the phase synchronization sequence signal transmitted by the first-stage relay station are set as second-stage relay stations, and the number of the second-stage relay stations is n.
4. A novel high-precision system synchronization method as claimed in claim 1, wherein the phase synchronization sequence signal further includes a level code, said level code includes {1, 2.., a }, where a is a constant.
5. The novel high-precision system synchronization method of claim 1, wherein the second-stage relay station performs field strength decision, phase decision and phase synchronization in sequence according to the phase synchronization sequence signal, and comprises:
and the second-stage relay station judges the field strength of the received phase synchronization sequence signal, compares the phase information of the first-stage relay station with the phase information of the second-stage relay station if the signal strength is qualified, and modifies the phase information of the second-stage relay station according to the phase information of the first-stage relay station.
6. A novel high-precision system synchronization method as claimed in claim 1, wherein before a plurality of relay stations simultaneously receive the service request information from the terminal, the relay stations continuously perform their own carrier calibration, which comprises:
the relay station receives the Beidou time base signal and acquires the phase of the Beidou time base signal and the frequency of the temperature compensation crystal oscillator of the relay station;
and calibrating the self temperature compensation crystal oscillator frequency of the repeater by taking the Beidou time base signal as a standard, thereby realizing the carrier calibration of the repeater station and automatically generating control parameters according to the current working state.
7. The method as claimed in claim 6, further comprising calibrating the self, temperature compensated crystal oscillator frequency by the control parameters when the relay station cannot receive the beidou time base signal.
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