Sky wave over-the-horizon radar self-adaption interference rejection method based on sidelobe constraint

Abstract

The invention discloses a sky wave beyond visual range radar adaptive interference suppression method based on side lobe constraint, for resolving the problems as segment adaptive processing time sea and ground clutter spectrum spread. The inventive method comprises respectively forming receiving beams pointing theta 0 for the check unit and a sample unit as main antenna, selecting a plurality of receiving antennas as auxiliary antennas, respectively processing 3-pulse MTI treatment on the data of main antenna and auxiliary antennas of the sample unit, respectively processing Doppler filter on the data of each segment of the auxiliary antennas of the check unit, and keeping zero Doppler channel output, using the data of the sample unit to calculate out the adaptive weight value of each data segment of the auxiliary antennas of the check unit, processing adaptive filter on the data of the sample unit, processing interference accumulation on the adaptively filtered data to obtain the Doppler spectrum with interference constraint. The invention has high interference constraint property and low operand, which is suitable for sky wave beyond visual range radar adaptive interference suppression.

Description

technical field [0001] The invention belongs to the field of radar technology, and specifically relates to an adaptive interference suppression method for sky-wave over-the-horizon radar based on sidelobe constraints, which is used to eliminate sea noise caused by time-varying adaptive weights under the condition of ensuring interference suppression performance. , Ground clutter spectrum broadening. Background technique [0002] Sky-wave over-the-horizon radar SKW-OTHR has been valued by many countries for its outstanding advantages such as wide-range surveillance capabilities, low-altitude raid prevention, anti-stealth and early warning capabilities. SKW-OTHR relies on the refraction effect of the ionosphere to detect long-distance targets, and its effective distance can reach several thousand kilometers. Although the resolution and accuracy of SKW-OTHR are not high, it is of great value as an early remote warning. SKW-OTHR uses the ionosphere for downward-looking detecti...

AI Technical Summary

Problems solved by technology

If the assumptions are not fully established, that is, the interference cannot be completely suppressed, the data used for the constraint conditions not only include sea and ground clutter echo signals, but also interference residuals, which will cause the resulting adaptive weights to fail to completely suppress the interference. remove

Since the interference cancellation residual signal enters the constraints, the interference cancellation residual has a cumulative effect between the segments, resulting in a much lower overall interference cancellation performance

Images