Method and device for processing signals based on broadcast mode automatic dependent surveillance

Abstract

The invention discloses a method and a device for processing signals based on a broadcast mode automatic dependent surveillance. The method comprises the following steps of obtaining pulse amplitude information, consisting of message amplitude information, by sampling spreading discontinuous oscillation signals; obtaining pulse information and a leading head mark according to the pulse amplitude information; obtaining a reference amplitude value according to the leading head mark, the pulse information and the pulse amplitude information; obtaining a confidence level bit and a data qualification bit of a data bit in the message amplitude information by combining with the leading head mark, the pulse information and the pulse amplitude information according to the reference amplitude value; and correcting message information in the spreading discontinuous oscillation signals according to the obtained confidence level bit and data qualification bit of the data bit in the message amplitude information. The embodiment of the invention can efficiently reduce error data bits in the message information and improve the stability of message signals.

Description

technical field [0001] The invention relates to signal processing technology, in particular to a signal processing method and device based on broadcast automatic correlation monitoring, and belongs to the field of aviation technology. Background technique [0002] With the rapid development of aerospace technology, it is an important part of air traffic control to make the aircraft on the route fly in the airspace safely, effectively and in a planned way. Air traffic control needs to monitor the flight dynamics of the aircraft in the airspace in real time. [0003] The traditional radar monitoring method uses the query and response method to detect the target, but the radar system itself has many limitations, which limit the improvement of monitoring performance. The rotation period limits the improvement of the data update rate, thereby limiting the improvement of the surveillance accuracy; the inability to obtain situational data such as the planned route and speed of the ...

AI Technical Summary

Problems solved by technology

The ADS-B system based on the 1090ES data link uses an omnidirectional antenna, and as the response signal of all secondary radar A / C modes of air transport, it can be received by the ADS-B equipment; The number of extended intermittent oscillation signals sent by the on-board equipment is much more than the signals detected by the existing SSR system, and the probability of interference between the signals is also much greater; especially near the airport, when the signals are very dense When the traditional secondary radar A / C mode response signal is superimposed on the extended intermittent oscillation signal, the received signal may form a false extended intermittent oscillation packet header flag in timing, and may cause subsequent Misjudgment of 112 data bits

Therefore, in order to obtain an effective signal, the signal decoding method adopted in the prior art is to use the amplitude of the first pulse of the preamble as a reference, and use -6dB as the reference amplitude of the following message; but when the extended intermittent oscillation When the message is superimposed and interfered by the response signal of A / C mode, this method may generate an excessively high reference amplitude, resulting in the loss of subsequent messages, which greatly reduces the stability of the signal and the accuracy of decoding

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