Method for testing gain to noise temperature (G/T) value (ground station quality factor) of ground station by using dual-station common-view comparative method
A technology of common-view comparison and ground station, which is applied in noise figure or signal-to-noise ratio measurement, transmission monitoring, electrical components, etc. It can solve problems such as cumbersome operation, cumbersome steps, and inability to complete G/T value testing, and achieve measurement Accurate, easy to operate and reliable results
Inactive Publication Date: 2014-04-09
10TH RES INST OF CETC
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Problems solved by technology
[0007] First, the operation is cumbersome
Each test of the calibration tower method needs to manually move the signal source to the calibration tower, operate the antenna to the tower, and establish a wireless link to the tower. The test involves many links and cumbersome steps;
[0008] Second, it is limited by the calibration tower conditions
The calibration tower method and the tower-less comparison method both use the calibration tower as a prerequisite. If the calibration tower does not meet the far-field conditions (such as the antenna aperture is too large or the frequency band is too high, it usually cannot meet the far-field conditions) or no tower at all, the test cannot be carried out;
[0009] The third is limited by the flux density of radio stars
[0010] When there is no local calibration tower or the calibration tower does not meet the far-field conditions, and the radio star method cannot be used due to high frequency band or small antenna aperture, none of the existing methods can complete the G / T value test
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[0017] refer to figure 1 ,exist figure 1 Among the G / T value test equipment described, the antenna, downlink channel, and downlink IF switch matrix are the working equipment of the ground station, and the test switch network and spectrum analyzer are supporting test calibration equipment for the ground station. When testing the G / T value, the radio frequency signal sent by the satellite is received by the antenna and enters the downlink channel. After the downlink channel completes the downconversion and filtering of the radio frequency signal, it is converted into an intermediate frequency 70MHz signal and enters the downlink intermediate frequency switch matrix, and then sent to the automatic test branch. The test switch network of the system enters the spectrum analyzer through the network switching signal, and the signal-to-noise ratio S / Φ of the received signal is read by the spectrum analyzer, and the G / T value test is performed.
[0018] First, a ground station whose G...
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The invention provides a method for testing a gain to noise temperature (G / T) value (a ground station quality factor) of a ground station by using a dual-station common-view comparative method, and aims to provide a G / T value testing method which is simple, convenient and reliable for operation, enables the measurement to be accurate, is independent of a calibration tower and has no restrictions on the aperture and frequency band of an antenna of the tested station. The method is realized through the following technical scheme: firstly, a reference station of which the G / T value is accurately known and the frequency band is the same as the tested station is selected; afterwards, under a common-view condition of the same satellite, signal to noise spectral density ratios (signal to noise ratios) S / Phi of the tested station and the reference station are respectively tested; and finally, the G / T value of the tested station is obtained by using the difference between the S / Phi of the two stations plus the deference of free space losses of the two stations. The method provided by the invention completely gets rid of the dependence on the calibration tower or a radio star in the prior method, and has no restrictions on the aperture and the working frequency band of the antenna the ground station.
Description
technical field [0001] The invention relates to a dual-station common-view comparison test method for ground station quality factor (G / T value, that is, gain-to-noise-temperature ratio) in the field of aircraft measurement and control and satellite communication. The "ground station" here includes ground fixed stations, vehicle-mounted stations, and ship-borne stations. Background technique [0002] Ground station quality factor (G / T value) is an important index to measure the performance of the ground station receiving system, and is a mandatory test item for ground station system acceptance and network access verification. The larger the G / T value, the higher the antenna receiving gain G, and the lower the noise equivalent temperature T of the receiving system, which means the higher the receiving sensitivity of the system and the larger the amount of information that can be received. There are three main methods for testing the G / T value of the ground station: [0003] ...
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IPC IPC(8): H04B17/00G01R29/26H04B17/336
Inventor柴霖
Owner10TH RES INST OF CETC