ADS-B (Automatic Dependent Surveillance-Broadcast) signal low-sensitivity receiving method based on satellite-borne scene

Abstract

The invention discloses an ADS-B (Automatic Dependent Surveillance-Broadcast) signal low-sensitivity receiving method based on a satellite-borne scene, and solves a problem of obtaining little messageinformation by demodulation, which is caused by a low level for receiving an ADS-B signal sent by an aircraft in the satellite-borne scene. According to the ADS-B signal low-sensitivity receiving method, logarithmic detection and AD quantization are carried out on a signal output by a radio frequency front end; shaping of a signal waveform is completed by utilizing a narrowband filter; rising andfalling edge sampling points of headers of the ADS-B signal and pulses near the headers of the ADS-B signal are subjected to statistics to obtain corresponding rising and falling degree counting results; judgment is carried out on a counting adding result so as to determine a suspected header; then adding judgment is carried out according to a null signal site sampling point near the message pulse so as to determine whether the suspended header is an active header; and finally, by utilizing a three-order coefficient weighting method, difference judgment on an ADS-B message site is completed.Compared to an existing ground ADS-B receiving technology, the ADS-B signal low-sensitivity receiving method disclosed by the invention is higher in receiving sensitivity, lower in false alarm probability and lower in bit error rate of message information, and can adapt to a weak signal monitoring scene of a satellite-borne ADS-B monitoring system.

Description

technical field [0001] The present invention designs a low-sensitivity receiving method for ADS-B signals based on space-borne scenarios, which is mainly aimed at the low-sensitivity reception of ADS-B signals in space-borne scenarios, realizes the acquisition of aviation information from space satellites, and enhances transoceanic routes and polar aerial surveillance capabilities. Background technique [0002] Automatic Dependent Surveillance-Broadcast (ADS-B) technology is the core of the new generation of civil aviation surveillance technology, and it has been widely used. It continuously broadcasts the aircraft's attributes, current longitude, latitude and altitude three-dimensional position, speed, steering and other status through a dedicated wireless data link. The ground air traffic control center receives the signal for air traffic management monitoring, cockpit traffic information display and Airport scene surveillance management, etc. [0003] The traditional se...

AI Technical Summary

Problems solved by technology

In DO-260B’s sensitivity requirements for Class A ADS-B receivers, the sensitivity of the most sensitive Class A3 receiver is only -84dBm, so the existing ADS-B ground receiving processing algorithm cannot meet the requirements of low-signal satellites. Noise Ratio Environment Requirements

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