A clock calibration method and system based on tws radar data processing system

Abstract

The invention discloses a clock calibration method based on a TWS radar data processing system. Sector number, determine whether the sector number is 0, if so, add 1 to the cycle counter; if not, calculate the time difference between the sector time obtained this time and the sector time last time; determine whether the time difference is less than the set threshold; If yes, use the radar rotation period calculated last time; if not, perform one-dimensional estimation filtering; fill the filtered period value into the cycle time sector queue; based on the filtered period value, forward Push 25% of the total number of sectors and fill in the sector time. The method adopts a sector-by-sector clock estimation and calibration method, realizes self-adaptive sector clock calibration, has a small amount of calculation, and can avoid false alarms and missing alarms caused by inconsistencies in local time.

Description

technical field [0001] The invention relates to the technical field of radar data processing, in particular to a clock calibration method and system based on a TWS radar data processing system. Background technique [0002] Tracking While Scanning (TWS: Tracking While Scanning) radar data processing system continuously scans the radar antenna to obtain the position and velocity vector of the target. It is a common processing architecture for airway radar and airport radar. This method can realize scanning and detection in one cycle , Track start, target tracking, track termination and other functions, it is a radar data processing architecture with low resource consumption, high computing efficiency, and good real-time performance. However, due to the inherent characteristics of the turntable, including static errors generated during processing, installation and adjustment, structural deformation caused by self-weight, inertial load, wind load, temperature difference, uneven...

AI Technical Summary

Problems solved by technology

[0004] (1) During the start of the track, due to the unstable speed and the commonly used method, the system will calculate a smaller or larger speed for the real target detected because of the inaccurate time, thus exceeding The speed threshold is exceeded, and thus the track cannot be started correctly; in the system of three-point track start, it will also lead to the calculation of a large acceleration error, which will cause the track start to fail; when starting from the course limit In the system, it will also cause a wrong angular velocity to be generated, resulting in the failure of track initiation

During the track initiation, the system will incorrectly calculate the wrong kinematic parameters related to time, resulting in the failure of track initiation; it will also generate false targets due to the wrong time, resulting in missed alarms and false alarms. produce

[0005] (2) In the process of target tracking, there will be erroneous estimation of the motion state, thereby losing the target; generating wrong kinematic parameters such as speed, heading, acceleration, etc., generating wrong parameters for air traffic control automation systems, early warning systems, etc., This in turn leads to wrong judgments made by the automated system, which leads to wrong decisions made by the backend

[0006] (3) In the process of target management, due to the wrong speed cycle, the target that is normally tracked will be lost many times, and the system will delete the track, resulting in the loss of the target track. fatal

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