Method for detecting G/T value of ground monitoring station by towery and towerless comparison

Abstract

The invention provides a method for detecting a G / T value of a ground monitoring station by towery and towerless comparison, comprising the following steps of: testing and recording a G / T tower value and a corresponding signal-noise spectrum density specific value (S / Phi tower by using a towery test; testing the output power PO of a HPA (High-Power Amplifier) corresponding to the same S / Phi and the attenuation value ATT0 of a zero-calibration frequency converter by using an offset feed wireless closed loop and recording the PO; during detection by using a comparison method, setting the high-power amplifier output power as the PO and the attenuation value of the zero-calibration frequency converter as the ATT0; and testing the current S / Phi value and comparing the current S / Phi value with the obtained S / Phi tower to obtain the change condition of the G / T value and obtaining G / T=G / T tower+ S / Phi - S / Phi tower of the current system. In the invention, the downlink signal-noise ratio can be conveniently obtained by using an offset feed wireless closed loop and has the convenience of a towerless test and the precision of the towery test in comparison with an initial state offset feed wireless closed loop; and the grain noise-temperature specific value (G / T) of the ground monitoring station can be obtained conveniently and more accurately.

Description

technical field [0001] The invention relates to a method for comparing and detecting the gain-to-noise-temperature ratio (G / T) of a ground measurement and control station with or without a tower in the field of aerospace measurement and control. Background technique [0002] At present, the test of the G / T value of the ground measurement and control station adopts the method of placing the signal source, beacon antenna, and joint test cable on the tower. The ground station faces the tower, receives the signal sent by the tower, uses the spectrum analyzer to measure the strength of the received signal, and calculates the gain-to-noise temperature ratio G / T value of the system through link calculation. The above-mentioned prior art has the following disadvantages: First, each test requires personnel to transport the signal source to the calibration tower, operate the antenna pair tower, and establish a wireless link to the tower, and the test involves many links and cumbersome...

AI Technical Summary

Problems solved by technology

The above-mentioned prior art has the following disadvantages: First, each test requires personnel to transport 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 the steps are cumbersome; It is for the situation that there is no calibration tower available when the ship-borne measurement and control station goes to sea to perform tasks, and the current G / T value of the system will not be available

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