A dual-frequency transmission method and a clutter suppression method based on dual-frequency real-time processing

Abstract

The invention relates to the field of radar overall design and signal processing, and particularly relates to a dual frequency transmitting method and a clutter suppression method based on dual frequency real-time processing. According to the invention, in the limited beam dwell time, the number of close pulse echoes is increased in the beam dwell time through the effective transmitting method and the corresponding processing method; the clutter suppression ability is improved; and the problem of contradiction between clutter suppression and time resources is solved.

Description

technical field [0001] The present invention relates to a dual-frequency transmission mode in the field of radar overall design and signal processing and a clutter suppression method based on dual-frequency real-time processing, in particular to a method for improving clutter suppression capability, which can be widely used in pulse radar systems designing. Background technique [0002] The clutter environment is caused by a large number of scattering units (such as terrain, ground objects, ocean waves) distributed on the surface of the earth or scattered in a certain volume of space (such as meteorological reflections and metal chaff). Taking effective measures will seriously affect the low-altitude detection performance of ground radar. The clutter suppression ability refers to the ability of the radar to suppress the interference clutter from the ground, sea surface, air and other areas during the detection process. It is an important indicator for evaluating the perform...

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Problems solved by technology

[0003] The suppression effect obtained by using Doppler filters such as MTD / PD is closely related to the pulse accumulation time. The longer the accumulation time and the larger the number of pulses, the higher the corresponding frequency resolution and the better the corresponding suppression effect. Carry out all-round scanning, and the beam dwell time in each direction must be fixed

In order to have both long-distance and short-distance full-range detection, long-range pulses are usually used for long-distance detection and short-range pulses are used for short-distance detection. During the beam dwell time, there are generally two traditional working sequences. One, long-distance Distance and short distance alternately transmit waveforms with different pulse widths and the same repetition period. At this time, short distance and long distance have the same pulse number and maximum accumulation time, and the clutter suppression ability of both is the same; 2. Long distance and short distance are independent Transmit waveforms with different pulse widths and different repetition periods. The number of long-distance or short-distance pulses can be adjusted according to requirements. The number of pulses and the corresponding accumulation time of the two within the beam dwell time can be different. When allocating more time, use When more pulses are generated at short distances to improve short-distance clutter suppression capabilities, the corresponding accumulation time at long distances will be reduced, resulting in a decrease in radar detection power

[0004] In the above-mentioned traditional working sequence, the beam dwell time limits the improvement of the clutter suppression ability, but due to the limitation of the basic indicators such as the antenna speed and beam width, the beam dwell time is relatively fixed, and there are clutter suppression and The problem of conflicting time resources

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