Radio frequency front end circuit for monitoring broadband satellite signal

Abstract

The invention provides a radio frequency front end circuit for monitoring a broadband satellite signal. The radio frequency front end circuit comprises a simulating power detection circuit, a double conversion circuit, a program control gain circuit and a circuit space separating cavity, wherein the simulating power detection circuit comprises a digital threshold comparison circuit and a logarithm detector which are connected with each other in turn; the double conversion circuit comprises a variable local oscillator frequency mixer circuit, a first frequency mixer, a first band-pass filter, a second band-pass filter, a second frequency mixer, a fixed local oscillator frequency mixer circuit and a third band-pass filter which are connected with each other in turn; the program control gain circuit comprises a first numerical control attenuator, a first fixed amplifier and a second fixed amplifier which are connected with each other in turn; the second fixed amplifier is connected with the third band-pass filter; the logarithm detector is connected with the first frequency mixer; the second frequency mixer is connected with the first numerical control attenuator. The radio frequency front end circuit provided by the invention is simple in structure and low in cost and is used for automatically performing gain control on the satellite signal.

Description

technical field [0001] The invention relates to the field of radio frequency front-end technology, in particular to a radio frequency front-end circuit for broadband satellite signal monitoring. Background technique [0002] As my country's comprehensive strength in the high-tech field continues to increase, the number of satellites in orbit that can be used is increasing, the capacity of satellite transponders is increasing, and the application range of satellite communications is becoming wider and wider. The following problems are , due to the existence of a large number of communication terminals, higher requirements are put forward for the effective use of satellite transponders. If the allocation and use of spectrum resources is unreasonable, mutual interference between communication terminals will easily occur, which will reduce the reliability and stability of communication. Satellite communication users need an effective satellite spectrum monitoring method to grasp ...

AI Technical Summary

Problems solved by technology

[0003] At present, the main technical means for satellite channel spectrum monitoring in the field of satellite communications is mainly to use spectrum analyzers. The disadvantages of this type of spectrum analyzer are high cost and complex structure of instruments and devices.

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