Radio frequency receiving channel circuit for realizing anti-interference antenna of satellite navigation and method

Abstract

The invention relates to a radio frequency receiving channel circuit for realizing an anti-interference antenna of satellite navigation and a method. The radio frequency receiving channel circuit is integrated with functions of low-noise amplification, frequency mixing, and filtering. A radio frequency signal enters and passes through a low-noise amplifier filtering circuit; an amplifier N1 carries out low-noise amplifier and a filter Z1 carries out radio frequency filtering, and then a filter Z1 carries out radio frequency filtering, an amplifier 3 carries out low-noise amplification, and a filter Z2 carries out radio frequency filtering; the processed signal enters a down conversion circuit, a mixer carries out down conversion to generate an intermediate-frequency signal; a filter formed by an inductor L3, a capacitor C24, and an inductor L4 carries out filtering; the filtered signal enters an intermediate-frequency amplification and filtering circuit, an amplifier N6 carries out intermediate-frequency amplification, a filter N7 carries out intermediate-frequency filtering,, and then the signal enters a digital anti-interference circuit for processing. 1-dB compression points with sufficient sizes of amplifiers at all stages are selected, so that the high-interference signal with the signal-to-interference ratio of 70dB can be amplified linearly; and thus the signal can enter a circuit at a next stage effectively without any distortion.

Description

technical field [0001] The invention relates to a radio frequency receiving channel circuit for realizing satellite navigation anti-jamming antenna. Background technique [0002] The radio frequency receiving channel circuit is an indispensable part of the satellite navigation anti-jamming antenna, and the index requirements are high. It must meet the sensitivity requirements and meet the anti-jamming requirements. The original radio frequency receiving channel circuit has a small range of receiving signals, and can receive interference signals with a maximum interference-to-signal ratio of 65dB. Moreover, the structure is complex, there are many components, and debugging is troublesome. The noise figure is greater than 2, and the noise introduced is large, which affects the overall performance Signal quality. Contents of the invention [0003] In view of the deficiencies in the prior art, the present invention provides a radio frequency receiving channel circuit and meth...

AI Technical Summary

Problems solved by technology

The original radio frequency receiving channel circuit has a small range of receiving signals, and can receive interference signals with a maximum interference-to-signal ratio of 65dB. Moreover, the structure is complex, there are many components, and debugging is troublesome. The noise figure is greater than 2, and the noise introduced is large, which affects the overall performance Signal quality

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