Adaptive coarse synchronization method with high detection rate and low false alarm rate for satellite-based ads-b signal reception

Abstract

The present invention relates to a kind of self-adaptive high detection rate and low false alarm rate coarse synchronization method suitable for satellite-based ADS-B signal reception, belongs to the technical field of aerial surveillance, comprises the following steps: S1: obtain digital baseband signal, and said Energy accumulation of digital baseband signals to obtain an energy distribution curve; S2: Estimated signal-to-noise ratio; S3: Establish a signal detection model; S4: Combined with the energy accumulation curve, determine whether there is a signal. If there is a signal, the energy in the area where the signal exists is the largest The point at the frame header is regarded as the coarse synchronization center point; S5: Establish a model that satisfies the SNR and coarse synchronization adaptive interval under the high detection rate, and determine the mapping relationship between the SNR and the coarse synchronization interval under the high detection rate condition , according to the mapping relationship, the rough synchronization interval of the signal meeting the high detection rate condition is obtained; S6: Determine the rough synchronization interval. The invention reduces the error probability in the fine synchronization process under the condition of low signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of aerial surveillance, and relates to an adaptive rough synchronization method with high detection rate and low false alarm rate, which is suitable for satellite-based ADS-B signal reception. Background technique [0002] The satellite-based ADS-B monitoring technology is equipped with an ADS-B receiver on the satellite. The distance between the satellite and the aircraft is very far, resulting in a weak signal when the ADS-B message sent by the aircraft reaches the satellite, which seriously reduces the signal-to-noise ratio. The traditional The ground-based ADS-B synchronous detection method has a detection rate of less than 30% when the signal-to-noise ratio is 2.8dB (the theoretical signal-to-noise ratio required for synchronization in baseband processing when the 4M bandwidth meets the high detection rate), which cannot meet the required high synchronization rate. Compared with the ground-based ADS-B s...

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Problems solved by technology

[0002] The satellite-based ADS-B monitoring technology is equipped with an ADS-B receiver on the satellite. The distance between the satellite and the aircraft is very far, resulting in a weak signal when the ADS-B message sent by the aircraft reaches the satellite, which seriously reduces the signal-to-noise ratio. The traditional The ground-based ADS-B synchronous detection method has a detection rate of less than 30% when the signal-to-noise ratio is 2.8dB (theoretical signal-to-noise ratio required for synchronization in baseband processing when the 4M bandwidth meets the high detection rate), which cannot meet the required high synchronization rate Compared with the ground-based ADS-B signal synchronization detection method (relying on the header frame to detect more "synchronous headers", and then passing DF certification, power consistency detection, re-triggering and other screening to reduce the false alarm rate), the satellite-based ADS-B The difficulty of the B signal synchronization detection algorithm is how to determine as many "synchronization heads" as possible under low signal-to-noise ratio to meet the detection rate requirements

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