Header detection method with low false positive rate for high dynamic ads-b messages

Abstract

A low false alarm rate header detection method for high dynamic ADS‑B messages. The low false alarm rate header detection method of the high dynamic ADS-B message provided by the present invention is based on the characteristics of the sliding correlation between the local header and the received signal, and uses the samples of the received signal corresponding to the different positions of the local header to form a signal of interest and a background signal respectively, respectively. The constant false alarm detection threshold and the second detection threshold are given for the focus signal and the background signal, which makes the method not only applicable to the environment with low signal-to-noise ratio, but also can significantly improve the false alarm suppression ability of the algorithm. The simulation results show that this method has similar detection performance to the constant false alarm method in the low SNR interval, and has a lower average sample false alarm probability in the high SNR interval, so it is a suitable method for high dynamic SNR A range of ADS‑B message header detection methods with false positive suppression capabilities.

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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