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Time-frequency power stability detection method of AIS station

A detection method and a stable technology, applied in the field of communication, can solve the problems that the station and the spectrum analyzer cannot reach the time, cannot accurately determine the starting time of the measurement signal, synchronization, etc., and achieve the effect of easy and fast decoding

Active Publication Date: 2018-05-18
CHINA WATERBORNE TRANSPORT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a time-frequency power stability detection method of an AIS station, which can solve the deficiencies in the prior art, for the AIS station cannot output a synchronous electrical signal to the outside when it starts to transmit the AIS signal, resulting in The station and the spectrum analyzer cannot achieve time synchronization, and cannot display absolute time information, and cannot accurately determine the starting time of the measurement signal output, and propose a time-frequency power stability detection method for automatic identification system stations , is a simple and easy-to-implement method

Method used

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  • Time-frequency power stability detection method of AIS station

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Embodiment 1

[0062] Embodiment 1: a kind of time-frequency power stability detection method of AIS station, it is characterized in that it comprises the following steps:

[0063] ①Connect the station to be tested with the spectrum analyzer installed with VSA software, use VSA vector signal analysis to obtain the actual AIS signal emitted by the station to be tested, refer to figure 2 , the signal received by the receiver can generally be expressed as:

[0064]

[0065] Among them: A(t) is the time-varying amplitude; is the phase information of the signal; w c is the carrier angular frequency;

[0066] ①-A Set the time length of recording data in the VSA software of the spectrum analyzer to 26.67 milliseconds; the number of points is set according to 8 times the code rate; the center frequency is 161.975MHz, and then wait for the signal of the station to be tested to trigger the VSA software;

[0067] ①-B When the signal of the station to be tested arrives, the VSA software of the s...

Embodiment 2

[0102] Embodiment 2: a kind of time-frequency power stability detection method of AIS station, it is characterized in that it comprises the following steps:

[0103] ①Connect the station to be tested with the spectrum analyzer installed with VSA software, use VSA vector signal analysis to obtain the actual AIS signal emitted by the station to be tested, refer to figure 2 , the signal received by the receiver can generally be expressed as:

[0104]

[0105] Among them: A(t) is the time-varying amplitude; is the phase information of the signal; w c is the carrier angular frequency;

[0106] ①-A Set the time length of recording data in the VSA software of the spectrum analyzer to 26.67 milliseconds; the number of points is set according to 16 times the code rate; the center frequency is 162.025MHz, and then wait for the signal of the station to be tested to trigger the VSA software;

[0107] ①-B When the signal of the station to be tested arrives, the VSA software of the ...

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Abstract

The invention provides a time-frequency power stability detection method for an AIS station. The method comprises the following steps: obtaining an AIS signal based on a VSA, calculating a detection index, performing data decoding and Bit positioning, and performing index measurement based on a Bit position. According to the time-frequency power stability detection method provided by the invention, data collection is performed by using VSA vector signal analysis, the collected data are decoded, and then a detection scheme of bit positioning is performed, thereby reducing the data size, and facilitating the fast decoding and index calculation and other subsequent calculation; and the time-frequency power stability detection method is of great significance for the detection of the communication performance of the AIS station, and especially the frequency and power stability of a transmitter.

Description

(1) Technical field: [0001] The invention belongs to the technical field of communication, and in particular relates to a method for detecting time-frequency power stability of an AIS (Automatic Identification System—Automatic Identification System) station. (two) background technology: [0002] Automatic Identification System (Automatic Identification System, AIS) is a kind of ship navigation equipment, through VHF (Very High Frequency, very high frequency, VHF) to send the ship's information and receive the information sent by the base station and surrounding ships, so as to achieve the purpose of collision avoidance and improve the safety of the ship. safety of navigation. With the widespread application of AIS, the berth has developed from the original single class A to class A and class B, as well as base stations, etc., and the water area of ​​application has developed from the original sea to inland rivers. The demand for berths is also increasing day by day, and the...

Claims

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Application Information

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IPC IPC(8): H04B17/15H04B17/17H04B17/10
CPCH04B17/102H04B17/104H04B17/15H04B17/17
Inventor 文捷张明睿姚治萱任勤雷耿雄飞
Owner CHINA WATERBORNE TRANSPORT RES INST