CN110138416B - Satellite-borne AIS ship wired multi-channel detection probability test method - Google Patents
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- CN110138416B CN110138416B CN201910290369.3A CN201910290369A CN110138416B CN 110138416 B CN110138416 B CN 110138416B CN 201910290369 A CN201910290369 A CN 201910290369A CN 110138416 B CN110138416 B CN 110138416B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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Abstract
The invention relates to a satellite-borne AIS ship wired multi-channel detection probability test method in the technical field of satellite test methods, which comprises the following steps: step 1, setting a test connection state; step 2, setting data transmission starting through satellite comprehensive electronics, and sending a data transmission command for forbidding AIS data reception; step 3, setting an AIS signal simulation source, starting an AIS ground signal processor, and setting the AIS signal simulation source; step 4, the AIS receiving processor receives the multi-channel radio frequency AIS signals transmitted by the analog source and carries out preprocessing; and 5, the AIS ground signal processor performs time slot conflict, demodulation and other processing on the AIS data received by the logarithm transmission ground server, and the ship detection probability is obtained by comparing the resolved MMSI number with the sent MMSI number. The AIS wired detection probability test method under the whole satellite state is provided, the problem that a ground test field is limited is solved, the satellite development progress is accelerated, and the method has high universality.
Description
Technical Field
The invention relates to the technical field of satellite testing methods, in particular to a satellite-borne AIS ship wired multi-channel detection probability testing method.
Background
The satellite-borne AIS system (automatic ship identification system) is a novel digital navigation aid system, and mainly adopts a self-organizing time division multiple access SOTDMA mode to realize the functions of channel access, equipment intercommunication and the like. The system encapsulates dynamic and static information such as the longitude and latitude, the name of the ship and the like into specific telegraph messages, and broadcasts the messages to the ships and the base stations of the nearby water areas in VHF (very high frequency) channels so as to realize mutual identification of the ships and guarantee navigation safety. With the development of the marine transportation industry and the demand for sea area safety monitoring, the satellite-borne AIS system (automatic ship identification system) is more and more emphasized by domestic and overseas research with the advantage of wide-range coverage. Because satellite AIS detects the coverage great, AIS antenna can receive the AIS information between different VHF communication cell units simultaneously, causes the problem of AIS information conflict very easily under the intensive condition of ship, increases the decoding degree of difficulty.
The invention provides an AIS (automatic identification system) wired detection probability test method in a whole satellite state, which defines the relative instruction time sequence relation between data transmission and an AIS load and avoids AIS data frame start bit deviation (when an AIS receiving processor is powered on, the data transmission is not set to prohibit the AIS data from being received, a disturbance pulse signal of an interface circuit can be received by a started data processor as normal data, so that the AIS data frame start bit is deviated, and the subsequent AIS data processing cannot be carried out). In addition, there are influences such as multipath effect in AIS boats and ships wireless detection probability test, need test in the shielded cell, in order to satisfy wireless boats and ships detection probability test environment requirement, the whole star test state is reestablished to the satellite need to change the test place, and this process needs many satellite operations, brings great influence to research progress and cost. The invention reduces the requirement on the ground test field of the satellite by using the cable detection probability test method and accelerates the development progress of the satellite. The method has higher universality and can be applied to the detection probability test of the satellite-borne AIS ship with AIS load.
The invention provides the relative instruction time sequence relation between satellite data transmission and AIS load, avoids the deviation of the AIS data frame start bit, and reduces the requirement of a satellite ground test field.
Disclosure of Invention
The invention aims to provide a method for testing the wired multi-channel detection probability of a satellite-borne AIS (automatic identification System) ship. The method provided by the invention provides the AIS wired detection probability test method in the whole satellite state, solves the problem of limited ground test field, accelerates the satellite development progress, has higher universality, and can be applied to the detection probability test of the satellite-borne AIS ship with AIS load.
The invention is realized by the following technical scheme, and relates to a satellite-borne AIS ship wired multi-channel detection probability test method, which comprises the following steps:
step 1, setting a test connection state, wherein an AIS signal simulation source is connected with an AIS receiving processor through a plurality of ground high-frequency cables and is used for simulating the radio frequency signal characteristics of a satellite-borne AIS antenna port; the AIS receiving processor is connected with the data transmission subsystem through an LVDS cable, and the AIS receiving processor is connected with the overall circuit and the comprehensive electronic subsystem through a low-frequency cable; the AIS ground signal processor is connected with a data transmission ground server;
step 2, setting data transmission starting through satellite comprehensive electronics, and sending a data transmission command for forbidding AIS data reception; the AIS receiving processor is used for receiving an AIS receiving processing machine and sending an instruction to the general circuit; after the AIS receiving processor is started for 5 minutes, comprehensively and electronically sending a data transmission permission receiving AIS data instruction;
step 3, setting an AIS signal simulation source, starting an AIS ground signal processor, and setting the AIS signal simulation source;
step 4, the AIS receiving processor receives the multi-channel radio frequency AIS signals transmitted by the analog source and carries out preprocessing (sampling, quantification, time marking, storage and transmission); the on-board integrated electronics realizes the operation of sending a serial injection instruction to the AIS receiving processor and receiving related telemetering parameters, the overall circuit provides the operations of power on and off for the AIS receiving processor, and the data transmission receives AIS data sent by the AIS receiving processor;
and 5, the AIS ground signal processor performs time slot conflict, demodulation and other processing on the AIS data received by the logarithm transmission ground server, and the ship detection probability is obtained by comparing the resolved MMSI number with the sent MMSI number.
Preferably, in step 3, the setting of the AIS signal analog source includes the following steps:
(1) generating AIS signals of 500-plus-5000 ship targets, wherein the AIS signal format meets the technical specification requirement of ITU-R M.1371-5, and setting a ship distribution rule according to an actual application scene;
(2) setting multi-target AIS signal emission frequency points, frequency deviation, power and time delay related parameters according to the satellite orbit height and the relative position relation between the ship and the satellite;
(3) the continuous simulation produces a multi-target AIS signal of at least 300 s.
The invention has the following beneficial effects:
1. the invention provides an AIS (automatic identification system) wired detection probability test method in a whole satellite state, which defines the time sequence relation of related instructions of data transmission and AIS load and avoids AIS data frame start bit deviation (when an AIS receiving processor is powered on, the data transmission is not set to prohibit receiving AIS data instructions, disturbance pulse signals of an interface circuit can be received as normal data by a started data processor, so that the AIS data frame start bit is deviated, and subsequent AIS data processing cannot be carried out);
2. the AIS ship wireless detection probability test has the influences such as multipath effect, needs test in the shielded room, in order to satisfy wireless ship detection probability test environment requirement, and the whole star test state is rebuild to the satellite need to be changed the test field, and this process needs many satellite operations, brings great influence to the development progress and cost. The invention reduces the requirement on the ground test field of the satellite by using the cable detection probability test method and accelerates the development progress of the satellite.
3. The method has higher universality and can be applied to the detection probability test of the satellite-borne AIS ship with AIS load.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a block diagram of a test system of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Examples
In this embodiment, the method for testing the wired multichannel detection probability of the satellite-borne AIS ship according to the present invention includes the following steps: step 1, setting a test connection state; step 2, setting data transmission starting through satellite comprehensive electronics, and sending a data transmission command for forbidding AIS data reception; the AIS receiving processor is used for receiving an AIS receiving processing machine and sending an instruction to the general circuit; after the AIS receiving processor is started for 5 minutes, comprehensively and electronically sending a data transmission permission receiving AIS data instruction; step 3, setting an AIS signal simulation source, starting an AIS ground signal processor, and setting the AIS signal simulation source; step 4, the AIS receiving processor receives the multi-channel radio frequency AIS signals transmitted by the analog source and carries out preprocessing (sampling, quantification, time marking, storage and transmission); the on-board integrated electronics realizes the operation of sending a serial injection instruction to the AIS receiving processor and receiving related telemetering parameters, the overall circuit provides the operations of power on and off for the AIS receiving processor, and the data transmission receives AIS data sent by the AIS receiving processor; and 5, the AIS ground signal processor performs time slot conflict, demodulation and other processing on the AIS data received by the logarithm transmission ground server, and the ship detection probability is obtained by comparing the resolved MMSI number with the sent MMSI number.
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in FIG. 1, the method for testing the wired multi-channel detection probability of the satellite-borne AIS ship comprises the following steps:
step one, setting a test connection state, wherein an AIS signal simulation source is connected with an AIS receiving processor through two ground high-frequency cables and used for simulating the radio frequency signal characteristics of a satellite-borne AIS antenna port; the AIS receiving processor is connected with the data transmission subsystem through an LVDS cable, and the AIS receiving processor is connected with the overall circuit and the comprehensive electronic subsystem through a low-frequency cable; the AIS ground signal processor is connected with a data transmission ground server;
step two, setting data transmission starting through satellite comprehensive electronics, and sending a data transmission command for forbidding AIS data reception; the AIS receiving processor is used for receiving an AIS receiving processing machine and sending an instruction to the general circuit; after the AIS receiving processor is started for 5 minutes, comprehensively and electronically sending a data transmission permission receiving AIS data instruction;
step three, setting an AIS signal simulation source and an AIS ground signal processor for starting up, and setting the AIS signal simulation source:
generating AIS signals of 2500 ship targets, wherein the format of the AIS signals conforms to the technical specification requirements of ITU-R M.1371-5, and the content of the AIS messages is shown in table 1;
setting a ship distribution obeying uniform distribution rule;
setting the frequency deviation of-4-4 KHz, the power difference of 0-12dB and the time delay of 0-8ms of the multi-target AIS signals according to the satellite orbit height of 600km and the relative position relationship between the ship and the satellite;
setting a multi-target AIS signal emission frequency point of 162.025 MHz;
the continuous simulation is set to generate a multi-target AIS signal of 360 s.
TABLE 1 AIS message content
And fourthly, the AIS receiving processor receives the two-channel AIS radio frequency signals transmitted by the analog source, digitalizes the signals through filtering, AD sampling and the like, sends the signals into the FPGA for processing, finally processes the signals into baseband digital signals and outputs the baseband digital signals to the solid-state memory. Adding a time tag to the data by the solid-state memory, and transmitting the data to the data transmission subsystem after formatting; the on-board integrated electronics realizes the operations of sending a serial injection instruction to the AIS receiving processor, receiving remote measurement parameters and the like, and the overall circuit provides the operations of power on and off for the AIS receiving processor;
step five, setting the AIS receiving processor to write and stop through the comprehensive electronic sending serial injection instruction, sending a reading instruction again, working in a reading state, reading satellite-borne AIS data into the data transmission subsystem, and transmitting the satellite-borne AIS data to the AIS ground signal processor through the data transmission ground server; the AIS ground signal processor carries out time slot conflict resolution and demodulation processing on the two-channel AIS signal data, and AIS signal processing software has the capacity of resolving two-time slot conflict and three-time slot conflict; and converting the demodulated code element into effective information (such as MMSI (multimedia messaging service) number, longitude and latitude and the like) of the ship, storing the effective information into a specified file, and comparing the decoded MMSI number with the sent MMSI number to obtain the ship detection probability.
In summary, the present invention provides a method for testing AIS cable detection probability in a whole satellite state, which defines a timing relationship between data transmission and AIS load, and avoids AIS data frame start bit offset (when an AIS receiving processor is powered on, data transmission is not set to prohibit receiving of AIS data instructions, a disturbance pulse signal of an interface circuit is received as normal data by a started data processor, which causes AIS data frame start bit offset and disables subsequent AIS data processing); the AIS ship wireless detection probability test has the influences such as multipath effect, needs test in the shielded room, in order to satisfy wireless ship detection probability test environment requirement, and the whole star test state is rebuild to the satellite need to be changed the test field, and this process needs many satellite operations, brings great influence to the development progress and cost. The invention reduces the requirement on the ground test field of the satellite by using the cable detection probability test method and accelerates the development progress of the satellite. The method has higher universality and can be applied to the detection probability test of the satellite-borne AIS ship with AIS load.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A satellite-borne AIS ship wired multi-channel detection probability test method is characterized by comprising the following steps:
step 1, setting a test connection state, wherein an AIS signal simulation source is connected with an AIS receiving processor through a plurality of ground high-frequency cables and is used for simulating the radio frequency signal characteristics of a satellite-borne AIS antenna port; the AIS receiving processor is connected with the data transmission subsystem through an LVDS cable, and the AIS receiving processor is connected with the overall circuit and the comprehensive electronic subsystem through a low-frequency cable; the AIS ground signal processor is connected with a data transmission ground server;
step 2, setting data transmission starting through satellite comprehensive electronics, and sending a data transmission command for forbidding AIS data reception; the AIS receiving processor is used for receiving an AIS receiving processing machine and sending an instruction to the general circuit; after the AIS receiving processor is started for 5 minutes, comprehensively and electronically sending a data transmission permission receiving AIS data instruction;
step 3, setting an AIS signal simulation source, starting an AIS ground signal processor, and setting the AIS signal simulation source;
step 4, the AIS receiving processor receives the multi-channel radio frequency AIS signals transmitted by the analog source and carries out preprocessing; the on-board integrated electronics realizes the operation of sending a serial injection instruction to the AIS receiving processor and receiving related telemetering parameters, the overall circuit provides the operations of power on and off for the AIS receiving processor, and the data transmission receives AIS data sent by the AIS receiving processor;
step 5, the AIS ground signal processor carries out time slot conflict and demodulation processing on the AIS data received by the logarithm transmission ground server, and the ship detection probability is obtained by comparing the solved MMSI number with the sent MMSI number;
in step 3, the setting of the AIS signal analog source includes the following steps:
(1) generating AIS signals of 500-plus-5000 ship targets, wherein the AIS signal format meets the technical specification requirement of ITU-R M.1371-5, and setting a ship distribution rule according to an actual application scene;
(2) setting multi-target AIS signal emission frequency points, frequency deviation, power and time delay related parameters according to the satellite orbit height and the relative position relation between the ship and the satellite;
(3) the continuous simulation produces a multi-target AIS signal of at least 300 s.
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| CN111416672B (en) * | 2020-03-10 | 2022-04-22 | 深圳市富创优越科技有限公司 | AIS equipment test system, method and computer readable storage medium |
| CN111490838A (en) * | 2020-04-20 | 2020-08-04 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Ship-based satellite communication quality detection system and method |
| CN114499637B (en) * | 2021-12-28 | 2024-03-01 | 中国科学院空天信息创新研究院 | Method and system for implementing data transmission satellite-ground docking between ground receiving station and satellite |
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