Low false alarm rate header detection method for high dynamic ADS-B message

Abstract

The invention discloses a low false alarm rate header detection method for a high dynamic ADSB message. According to the low false alarm rate header detection method for the high-dynamic ADSB message,provided by the invention, according to the characteristics of sliding correlation between a local header and a received signal, attention signals and background signals are respectively formed by utilizing samples of the received signal corresponding to different positions of the local header; a constant false alarm detection threshold and a second detection threshold are respectively given fora concerned signal and a background signal, so the method not only can be suitable for a low signal-to-noise ratio environment, but also can significantly improve the false alarm suppression capability of the algorithm. Simulation results show that the ADSB message header detection method has detection performance similar to that of a constant false alarm method in a low signal-to-noise ratio interval, and has low average sample false alarm probability in a high signal-to-noise ratio interval, so the ADSB message header detection method with false alarm suppression capability is suitable for ahigh dynamic signal-to-noise ratio range.

Description

technical field [0001] The invention belongs to the technical field of information processing, in particular to a method for detecting a header with a low false positive rate of a high dynamic ADS-B message. Background technique [0002] Automatic Dependent Surveillance-Broadcast (ADS-B) technology is an important means of modern air traffic surveillance. The ADS-B system automatically broadcasts and sends messages containing aircraft situation information through the receiver-borne transponder to monitor the aircraft. [0003] Because the information transmitted on the ground-air data link is bursty and asynchronous, the ADS-B receiver needs to identify the ADS-B message from the received signal. The basic method to identify the ADS-B message is to detect the header of the ADS-B message with a fixed waveform from the received signal. Classic ADS-B message header detection methods mainly include 3dB detection method and pulse position (Valid Pulse Position, VPP) detection ...

AI Technical Summary

Problems solved by technology

However, neither the constant false alarm detection method nor other traditional methods can effectively suppress the false alarm problem in the ADS-B message header detection process

Since each of the above detection methods needs to continuously detect each sampling point or a sampling position in the signal sequence one by one, reporting a non-header position as a header or reporting a header position as a non-header is a false positive, ADS- B message adopts cyclic redundancy check (Cyclic Redundancy Check, CRC) method to verify and correct the accuracy of a piece of message, too high false alarm rate will cause computing equipment to call too many times of cyclic redundancy check, due to cyclic redundancy check The computational complexity of the test itself is high, so it will increase the processing load of the device, and the low signal-to-noise ratio environment further affects the false alarm rate.

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