Decoding board of ADS-B (automatic dependent surveillance broadcast) receiver

Abstract

The invention relates to a decoding board of an ADS-B (automatic dependent surveillance broadcast) receiver. A digital logic circuit of the decoding board comprises an AD (analog-digital) conversion module and an FPGA (field programmable gate array) digital logic module; a baseband digital processing part of the FPGA digital logic module mainly comprises an input signal synchronization module, a preamble detection module, a code bit pickup and confidence analysis module, a CRC (cyclic redundancy check) error detection and correction module and a ping-pong FIFO (first in and first out) access data module. With the adoption of a dynamic detection threshold method, a problem of high possibility of data loss in a decoding process is solved; compared with an original method, the data size after decoding is increased; by improving a logic time sequence in a baseband data processing process, a problem of non-aligned transmission of decoding data by accident is solved, and a situation of transmission data dislocation is eliminated; after a test, the decoding board is stable in working and reliable in performance.

Description

technical field [0001] The invention relates to navigation technology, in particular to a broadcast automatic dependent surveillance ADS-B receiver decoding board. technical background [0002] In the scientific research and production of digital communication products, the baseband digital processing part of the ADS-B receiver decoding board in the past usually uses segmented thresholds to control the power range of the current signal that can be processed during the signal amplitude filtering control, but the segmented thresholds It is often difficult to select, and it is easy to cause the signal to be incorrectly resolved due to improper selection of the threshold near the segmentation threshold, resulting in the problem of signal loss and discontinuity. How to solve this problem has become a subject to be studied and solved by those skilled in the art. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in th...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the problems of easy data loss and data misalignment in the decoding process of the existing receiver decoding board, to provide a broadcast automatic dependent surveillance ADS-B receiver decoding board The design scheme, by adopting the dynamic detection threshold method, solves the problem of easy loss of data in the decoding process, and increases the amount of decoded data compared with the original method; by improving the logic timing in the baseband data processing process, it solves the problem of decoding data Occasionally, the problem of misalignment of transmission eliminates the misalignment of transmitted data. The specific technical solution is a broadcast automatic dependent surveillance ADS-B receiver decoding board, whose digital logic circuit is composed of AD analog-to-digital conversion module and FPGA digital logic module The composition is characterized in that: the baseband digital processing of the FPGA part mainly includes an input signal synchronization module, a header detection module, a code bit picking and confidence analysis module, a CRC check error detection and error correction module, and a ping-pong FIFO access data module , the system baseband digital processing process mainly includes the following steps,

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