A method to improve the measurement accuracy of tws radar pitch angle

Abstract

The invention relates to a method for improving precision of TWS radar pitch angle measurement. Firstly, the pitch angle of the target in the next scanning cycle is predicted. The radar adjusts the scanning beam in the next scanning cycle and performs scanning at the predicted pitch angle + / - 3 degrees so as to improve the signal-to-noise ratio of the adjacent beams for finding the target. When adjacent beams scan the target, pitch angle measurement can be performed by amplitude comparison. When no adjacent beam scans the target, pitch angle measurement cannot be performed by amplitude comparison. Amplitude comparison for pitch angle measurement has high measurement precision so that the radar pitch angle measurement precision can be improved by changing smoothing filtering during the pitch angle scanning cycle into weighted filtering of the scanning times of the adjacent beams.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a method for improving the measurement accuracy of a pitch angle for a TWS radar using pitch sequence lobe ratio amplitude measurement. Background technique [0002] The TWS radar that uses the pitch sequential lobe ratio to measure the angle, while mechanically scanning in the azimuth, in the pitch direction, the beam is scanned quickly by electrical scanning to form multiple sequential lobes, and the signal processor converts the lobes in each lobe The target point trace is transmitted to the data processor, and the data processor condenses the point trace of the same target, and uses the beam amplitude information of multiple condensed points to measure the angle ratio of one or several adjacent lobes, and finally calculates the target The pitch angle measured in this scan cycle is smoothed and filtered according to the pitch angle measurement value of the previous scan cycle a...

AI Technical Summary

Problems solved by technology

[0003] A certain type of TWS radar needs to cover a wide range of airspace. According to the timing distribution of the system, four groups of beams are used to measure the angle of the sequential lobe ratio. The adjacent intersections of the group beams are located on the 3dB width. When measuring the pitch angle, since there are 10°-15° notches in the adjacent beams, the signal-to-noise ratio of the target found by the adjacent beams of the radar is not high. When measuring height, the accuracy of pitch angle measurement cannot meet the required indicators

In the existing sequential lobe ratio amplitude angle measurement technology, in order to improve the accuracy of pitch angle measurement, it is usually necessary to reduce the notches existing in adjacent beams. The number of beams must reduce the target data rate when the radar design resources remain unchanged, which affects the tactical performance of the system

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