A low-sensitivity receiving method of ads-b signal based on spaceborne scene

Abstract

The invention discloses an ADS-B signal low-sensitivity receiving method based on a space-borne scenario, which solves the problem that the low-level ADS-B signal sent by the receiving aircraft in the space-borne scenario results in less message information obtained through demodulation , it performs logarithmic detection and AD quantization on the signal output by the RF front-end, uses a narrow-band filter to complete the shaping of the signal waveform, and makes statistics on the rising and falling edge sampling points of the ADS-B signal header and its nearby pulses, and obtains According to the counting results of the corresponding rising and falling degrees, the counting and summing results are judged, so as to judge the suspected header, and then add and judge according to the empty signal bit sampling point near the header pulse to determine whether it is a valid header, and finally use the third-order coefficient The weighting method completes the differential judgment on the bits of the ADS-B message. Compared with the existing terrestrial ADS-B receiving technology, the present invention has higher receiving sensitivity, lower probability of false alarm, lower bit error rate of message information, and can adapt to the weak signal monitoring scene of the spaceborne 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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