S-mode signal arrival time extraction method for multi-preamble pulse combined filtering detection

Abstract

The invention discloses an S-mode signal arrival time extraction method for multi-preamble pulse combined filtering detection. The method comprises the following steps: confirming the sequential structure relationship of single, double and four pulses in a preamble pulse; constructing a multi-pulse differential matching filtering model; obtaining an output signal having a plurality of zero-crossing points; sampling the output signal; confirming the arrival position of the rising edge or falling edge of the pulse A in the S-mode leading pulse; determining a numerical value of arrival time of the S-mode pulse signal of the base station; obtaining arrival time differences or arrival time sums between the plurality of auxiliary stations and the main station; and obtaining continuous data of the target position coordinates, and finally processing the continuous data to form a target track. Simulation and actual measurement data analysis show that the method provided by the invention can improve the accuracy of arrival time estimation, thereby improving the meter-level positioning accuracy, consistency and other performance indexes of the multi-point positioning system.

Description

technical field [0001] The invention belongs to the technical field of civil aviation, and in particular relates to a method for extracting arrival time of an S-mode signal through combined filtering and detection of multiple leading pulses. Background technique [0002] Compared with traditional air traffic control primary and secondary surveillance radars and ADS-B (Automatic Dependent Surveillance-Broadcast) systems, the multilateration positioning system (MLAT) for airport surface surveillance applications has high positioning accuracy, convenient installation and debugging, and continuous coverage. It has the advantages of good performance, anti-deception and low cost. Therefore, more and more airports at home and abroad have equipped or are preparing to equip multi-point positioning systems in order to achieve continuous coverage of surface surveillance and efficient surface operation command and status monitoring. . On the other hand, there are currently many factors...

AI Technical Summary

Problems solved by technology

The analysis of the traditional leading pulse arrival time extraction algorithm and technology shows that most of the arrival time extraction algorithm models really focus on the detection and extraction of the arrival time of the first pulse in the leading pulse, while ignoring the arrival time of the other three pulses in the S mode leading pulse. The role of time extraction, that is, ignoring the role of the composition structure and timing structure of the leading pulse signal on the high-precision extraction of arrival time

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