Anti-interference adaptive AGC adjustment method and device based on smoothing filtering

Abstract

The invention discloses a satellite communication signal anti-interference adaptive AGC adjustment method and device based on smooth filtering. The method comprises the following steps: respectively calculating the amplitudes of orthogonal digital baseband signals I and Q in each period through an FPGA, comparing the amplitudes of I and Q, and taking the amplitude greater as the power value of the current period for output; in a preset time counting window, counting through a counter, and searching the maximum amplitude value in the time counting window; performing smooth filtering processing on the maximum amplitude value to obtain a mean value; comparing upper and lower thresholds of the mean value and a preset target amplitude by utilizing an FPGA to obtain a gain value of the gain control signal; and directly inputting the gain value of the gain control signal into the AGC chip through a pin for gain adjustment. The defects that resource consumption is large and burst interference cannot be resisted are overcome, a power detection module is deployed in the FPGA, gain adjustment is carried out through the MGC of the AGC chip, and the influence of adjacent channel burst interference is reduced through smooth filtering of the maximum amplitude.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, relates to an automatic gain adjustment technology of a satellite communication demodulator, in particular to an anti-jamming adaptive AGC adjustment method based on smoothing filtering. Background technique [0002] In the satellite communication system ground station receiver, due to the influence of transmission power, channel fading, and adjacent channel interference, the received power is very unstable, which makes the amplitude of the ADC quantized digital signal fluctuate up and down. In order not to affect the normal operation of the receiver demodulator, AGC is usually designed on the receiver side to ensure that the signal amplitude can be adaptively stabilized within a certain small dynamic range. [0003] The existing solution uses the AGC function of the AD9361 chip, but in the actual application process, it is found that the adjustment cycle is at the millisecond lev...

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Problems solved by technology

[0007] Aiming at the deficiencies of the above-mentioned related prior art, the present invention provides a satellite communication signal anti-interference adaptive AGC adjustment method and device based on smoothing filtering, which solves the defects of large resource consumption and inability to resist sudden interference in the current technology, and utilizes FPGA amplitude detection Combined with the MGC function of the AGC chip, the power detection module is deployed on the FPGA, and the gain adjustment uses the MGC of the AGC chip to reduce the impact of sudden interference from adjacent channels by smoothing the maximum amplitude

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