Active correction method for low-complexity ADS-B anti-interference array antenna

Abstract

The invention discloses an active correction method for a low-complexity ADS-B anti-interference array antenna. The method comprises the steps: receiving an airplane ADS-B signal through an array antenna; obtaining the longitude and latitude and height of an airplane through the demodulation of one signal, and recording the moment when the ADS-B signal arrives at the antenna; cutting the ADS-B signal received by the array antenna according to the moment when the ADS-B signal arrives at the antenna; solving the position of the airplane according to the ADS-B signal, and calculating the direction of the ADS-B signal through combining with the pre-measured position of the array antenna; correcting the array antenna through an active correction method with the known signal direction; taking a large number of ADS-B signals as an auxiliary signal source for correcting the array antenna, and solving the mean value of a plurality of correction results. The method does not need an additional auxiliary signal source, combines the advantages of two modes: active correction and self-correction, is small in calculation burden, is good in effect, and does not need the manual setting of the additional auxiliary signal source. The array performance is remarkably improved after correction.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, in particular to a low-complexity ADS-B anti-jamming array antenna active calibration method. Background technique [0002] Automatic Dependent Surveillance-Broadcast (ADS-B) is a new airspace surveillance technology being promoted by ICAO. Compared with the secondary radar (Secondary Surveillance Radar, referred to as SSR), the ADS-B system has higher accuracy, and the cost is much lower than SSR. It does not require manual operation or inquiry, and can automatically obtain parameters from relevant airborne equipment to broadcast the aircraft's position, altitude, speed, heading, identification number and other information to other aircraft or ground stations. [0003] At present, my country's aviation industry is developing rapidly. According to the "2016 National Airport Production Statistical Bulletin" published by the Civil Aviation Administration of China, in 2016, my count...

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Problems solved by technology

[0007] The current anti-jamming methods in signal processing are all based on the assumption that the array manifold of the array antenna is known accurately. However, the real array manifold will have a certain degree of deviation due to changes in the antenna process, antenna installation, environment and the device itself. Including amplitude and phase errors, position errors and mutual coupling, these errors will deteriorate the performance of the anti-interference method, or even fail

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