Large-dynamic-range electromagnetic signal long-distance transmission device

Abstract

The embodiment of the invention provides a large-dynamic-range electromagnetic signal long-distance transmission device. The large-dynamic-range electromagnetic signal long-distance transmission device comprises a pre-amplifier, a blocking device, a combiner and a bias device, wherein the pre-amplifier is used for amplifying useful signals received by an antenna and reducing system background noise; the bias device is used for realizing combination of direct current and signals, so that the direct current and the signals are transmitted through the same coaxial cable; the bias device is also used for ensuring that the direct current does not enter the spectrum analyzer and providing high impedance for the direct current power supply end to ensure that a signal is not injected into the direct current power supply input end; the combiner is used for realizing separation of a total path signal and direct current, and providing high impedance to ensure that the signal does not enter the power supply end of the pre-amplifier; and the DC blocking device is used for ensuring that direct current does not enter the signal input end of the pre-amplifier. According to the embodiment of the invention, during the long-distance transmission test of the electromagnetic signal, the tiny electromagnetic signal can be accurately identified.

Description

technical field [0001] The invention relates to the technical field of communication electronics, in particular to a long-distance transmission device for electromagnetic signals with a large dynamic range. Background technique [0002] When testing the electromagnetic characteristics of large-scale equipment such as an entire aircraft, in order to obtain a good electromagnetic background noise in the absence of a fully anechoic chamber that meets the test conditions, it is generally selected in a remote location with relatively few surrounding power and electronic facilities. place. The traditional test method transmits the radio frequency signal received by the antenna to the test equipment through a coaxial low-loss cable, and then uses signal processing technology to perform a series of transformations, so as to realize the monitoring of time domain signals to frequency domain signals. However, this traditional method has disadvantages such as large signal transmission ...

AI Technical Summary

Problems solved by technology

Because the use of battery power supply will cause the problem of overloading the high-altitude load; the use of power supply with special wires to transmit to the preamplifier will cause the wires and RF cables to form twists in the air, which poses a serious safety risk and will also cause additional damage. load

[0004] For this problem, since it mainly exists in the performance research and testing of military aircraft / civil aircraft or ship superstructure, the current relevant test standards do not have a standard test configuration that can be followed, and the industry has not promoted a set of practical ones. Test method to solve the practical difficulties encountered in the high-altitude electromagnetic characteristic test

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