Multi-parameter alternating search-based metrewave radar low elevation height measurement method

Abstract

The invention discloses a multi-parameter alternating search-based metrewave radar low elevation height measurement method, mainly solves the problem that the error in the height measurement of up and down positions in the prior art is large. The method comprises the following implementation steps: extracting a target signal from a radar echo to obtain a covariance matrix of the target signal; calculating a synthesis steering vector by using a direct steering vector and a reflected steering vector; estimating the pitch angle of a direct wave to obtain an estimated value; estimating the pitch value of a reflected wave to obtain an estimated value; performing alternating search on a ground reflection coefficient magnitude, a ground reflection coefficient phase, the pitch angle of the direct wave and the pitch angle of the reflected wave to obtain the estimated values of each parameter; judging whether the alternating search is finished or not; searching the pitch angle of the direct wave to obtain the estimated value of the pitch angle of the direct wave, namely the precise elevation of a target; and obtaining the target height. The method does not depend on precise radar position altitude parameters; the adaptive capacity of radar to the position is enhanced; the height measurement precision is improved; and the method can be used for target positioning and tracking.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and relates to meter-wave radar height measurement. Specifically, for digital array radar, a super-resolution height measurement method independent of terrain information is proposed, which can be used for target positioning and tracking. Background technique [0002] Meter wave radar is the main air defense system invented and used in World War II, and played an important role in World War II. After World War II, with the development of new technologies and the deepening of radar technology research, the performance of radar systems has been continuously improved, and the working frequency band is also developing towards microwave and millimeter waves. Meter wave radars are being eliminated due to their large size and low angle measurement accuracy. among. But in recent years, with the development and application of a series of high and new technologies such as anti-radiation mis...

AI Technical Summary

Problems solved by technology

After World War II, with the development of new technologies and the deepening of radar technology research, the performance of radar systems has been continuously improved, and the working frequency band is also developing towards microwave and millimeter waves. Meter wave radars are being eliminated due to their large size and low angle measurement accuracy. Among

This method is theoretically feasible, but the actual system is more complicated, and there is no such practical system at present

[0008] In summary, when the existing methods measure low-elevation targets, the antennas at both ends of the vertical-dimensional antenna array are far away from the ground reflection points, and the radar positions generally have a certain slope, which will cause antennas at different heights to receive ground reflections. The wave length of the reflected wave differs greatly, especially when the terrain of the radar position is complex and the ground undulates greatly, the angle measurement error of various existing altimetry methods is relatively large, which leads to the failure of target positioning or tracking

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