Automatic gain control method and device for radio frequency receiver

Abstract

The invention discloses an automatic gain control method and device for a radio frequency receiver. The device comprises a radio frequency antenna, a radio frequency gain unit, a signal amplifying unit, a down converter, an intermediate frequency digitization unit, a digital signal processing unit and a radio frequency power detecting unit, wherein the radio frequency power detecting unit detects radio frequency power of radio frequency signals after the radio frequency signals are subjected to gain treatment and amplification treatment; and the digital signal processing unit adjusts a gain value of gain treatment on the received radio frequency signals in real time according to power information detected by the radio frequency power detecting unit, so that power of the received radio frequency signals is positioned in a real-time dynamic range of the radio frequency receiver. The radio frequency power is digitalized directly, signal gain adjustment delaying caused by the reason that intermediate frequency signals are analyzed and judged at first and then the gain value of the gain treatment is adjusted is avoided, therefore, repeated adjustment of radio frequency gain is not required, gain adjustment time is short, and the circumstances of signal measurement distortion are reduced.

Description

technical field [0001] The invention relates to the technical field of radio frequency receivers, in particular to an automatic gain control method and device for a radio frequency digital receiver. Background technique [0002] At present, most RF wideband digital receivers adopt the superheterodyne method. The processing method is as follows: the signal received from the antenna is amplified by the high frequency amplifier of the receiver, and then added to the frequency conversion mixer together with the signal generated by the local oscillator to obtain the intermediate frequency signal. After the intermediate frequency digitization, digital signal processing is carried out, and then the signal measurement results are output. Due to the limited real-time dynamic range of the signal received by the wideband receiver, in order to meet the requirements of signal measurement, the receiver needs to modulate the output of the intermediate frequency signal through a gain contro...

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Problems solved by technology

[0005] The purpose of the present invention is: to overcome the automatic gain control mode of the radio frequency digital receiver in the prior art, it is necessary to repeatedly adjust the radio frequency gain, so that the gain adjustment time is too long, causing the change of the in-band signal power to exceed the real-time dynamic range of the receiver, and it is easy to generate signal The Problem with Measurement Distortion

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