Radio frequency receiving channel circuit for implementing satellite navigation anti-interference antenna

Abstract

The invention discloses a radio frequency receiving channel circuit for implementing a satellite navigation anti-interference antenna. The radio frequency receiving channel circuit includes a front filtering limiting circuit, a low noise amplifier, a lower frequency changing circuit, an automatic gain control circuit and an intermediate frequency filtering circuit. According to the design of the invention, the radio frequency receiving channel circuit is selective over signals, suppresses out-of-band signals and generated scattered signals, has anti-burn function and a wide dynamic range, ensures that no distortion is generated when signal amplitude changes, controls signal output within 0dB and noise coefficient within 1.2, ensures the minimum deterioration of signal to noise ratio when a signal is transmitted, and ensures that the signal work normally when the signal passes through the low noise amplifier, the mixer, the automatic gain control circuit and other non-linear devices. The radio frequency receiving channel circuit allows the constitution of the automatic gain control circuit by one chip and related resistors and capacitors that match with periphery, simplifies the automatic gain control circuit, and lowers complexity and power consumption of circuits.

Description

technical field [0001] The invention relates to a satellite navigation anti-jamming antenna, in particular to a radio frequency receiving channel circuit for realizing the satellite navigation anti-jamming antenna. Background technique [0002] The radio frequency receiving channel is a necessary circuit for processing satellite high-frequency signals in the satellite navigation anti-jamming antenna. It not only needs very low noise and good sensitivity, but also has a certain dynamic range to ensure its anti-jamming performance. The original RF receiving channel circuit has a small dynamic range of receiving signals, poor signal selectivity, no anti-burnout function, complex circuits, and cumbersome debugging. Contents of the invention [0003] In view of the deficiencies in the prior art, the invention provides a radio frequency receiving channel circuit with a simple circuit for realizing the satellite navigation anti-jamming antenna. The circuit can receive weak satel...

AI Technical Summary

Problems solved by technology

The original RF receiving channel circuit has a small dynamic range of receiving signals, poor signal selectivity, no anti-burnout function, complex circuits, and cumbersome debugging

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