Method for correcting high frequency radar antenna channel by utilization of AIS information

Abstract

The invention provides a method for correcting a high frequency radar antenna channel by the utilization of AIS information. Correction of a channel of a monopole cross loop antenna is conduced by the utilization of the received AIS information and received echoes of a large number of boats in a sea area covered by a radar and through analysis of the signal relation responded by the AIS information and the echoes of the boats in different channels. In the method, no auxiliary signal source set manually is needed, only simple AIS receiving equipment is needed, and the channel collection method is passive, convenient and easy to achieve and can be expanded to other antenna modes. The method has the advantages that the cost is low, and a large amount of complicated equipment during active correction is not needed; a large number of widely-distributed boat AIS signals are used, and therefore the obtained channel correction value is good in accuracy and stable; the calculated amount is small, the requirements for the shape and the structure of the antenna do not exist, and the application range is wide.

Description

technical field [0001] The invention relates to a method for correcting high-frequency radar antenna channels by using AIS information. Background technique [0002] High-frequency ground wave radar works in the high-frequency band of 3-30MHz, which can realize over-the-horizon detection of a large range of oceans. It has been widely used to detect sea state parameters, such as current velocity, current direction, and wave height. Since the wavelength of high-frequency signals is comparable to the scale of maneuvering targets (such as aircraft, ships, etc.), a larger scattering cross-section can be obtained, so it also has great potential in detecting hard targets. [0003] High-frequency radars use arrayed or compact antennas to estimate target azimuths through spatial beamforming or direction scanning techniques. The traditional array antenna has the characteristics of high precision and convenient signal processing, but also has the disadvantages of high cost and inconve...

AI Technical Summary

Problems solved by technology

The US CODAR company uses this method to measure the antenna pattern, which requires a lot of extra equipment, is inconvenient to operate, and does not have long-term stability.

Chinese patent CN101013147A, the name "high-frequency chirp radar pattern measurement method" provides a method of using a single-frequency continuous sinusoidal signal and utilizing time-frequency analysis to obtain an antenna pattern. Compared with traditional methods, this method greatly reduces the cost of measurement. The cost, but still need an additional signal source, the operation is more inconvenient

However, these methods are limited by special array shapes, are not easy to be extended to compact antennas, and the calculation is slightly complicated, and the performance cannot reach the level of active calibration; A method for antenna array channel correction" provides a method for antenna correction using ionospheric echoes, which has a small amount of calculation and good performance, but it is dependent on the ionosphere and lacks sufficient stability; Chinese patent CN102707270A, titled "Automatic Estimation Method of Relative Antenna Pattern of High-frequency Ground Wave Radar" provides a method to calculate the antenna pattern by software. This method requires a large amount of computation, and its practicability needs further verification

[0007] Combining the existing passive correction methods, usually the calculation amount is large and not stable enough, and there is still a lack of widely used and high-performance passive correction methods

Images