EVS-based digital gain compensation system and method for ADS-B receiver

Abstract

The invention discloses an EVS-based digital gain compensation system and method for ADS-B receiver , belonging to the field of aviation communication signal processing. According to the invention, an EVS module is connected with a radio frequency processing module; the radio frequency processing module is connected with the input end of an A / D module, and the internal gain of the radio frequency processing module is adjusted by a digital processing module; the A / D module is used as a bridge between the radio frequency processing module and the digital processing module, the output end of the A / D module is connected with the digital processing module and an arrival wave signal spatial spectrum estimation module, and the internal gain of the A / D module is adjusted by the digital processing module; a signal is received from the A / D module by using the wave arrival signal spatial spectrum estimation module, and estimated spatial spectrum data is transmitted to a multi-signal classification spectrum peak search module; and a multi-signal classification spectrum peak search module is used for transmitting obtained pitch angle information of an incident signal to the digital processing module for digital gain compensation, so the effect of eliminating ripple amplitude is achieved, and the bit error rate of the receiver is reduced.

Description

technical field [0001] The invention belongs to the field of aviation communication signal processing, and in particular relates to an EVS-based ADS-B receiver digital gain compensation system and a compensation method thereof. Background technique [0002] ADS-B technology is a technology based on satellite positioning information used to complete ground / air air traffic control surveillance and air-air surveillance in the form of data links between aircraft and ground, and between aircraft and aircraft. Most of the ADS-B receivers are relatively simple, generally with a zero-IF receiver structure, and the signal processing and decoding work is generally completed in the digital processing module. Since the front-end processing capability of the ADS-B receiver is not strong, a large amount of interference and noise will be brought into the digital processing module. Therefore, it is necessary to post-compensate the gain of the front-end low-noise amplifier to reduce the over...

AI Technical Summary

Problems solved by technology

[0004] 1) Increase the digital AGC compensation gain at the digital end at the cost of resource consumption; this method will take up a lot of computing resources, and eventually lead to an increase in power consumption and cost of the receiver at the same time

[0005] 2) At the expense of cost, use an expensive high-performance low-noise amplifier in the RF front-end; this method will lead to a substantial increase in cost, and the obtained performance value improvement is not enough to return the cost investment

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