For the sake of reducing the multi-path error when radar is tracking low altitude target a new method was developed which can keep the low side-lobe level of both sum and difference beam in single pulse angulation is satisfied with Taylor / Bayliss distributions based on array antenna .

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The author sum & discuss the smoke purification system of 50 t electric-arc furnace in Nol steelworks of TISCO . and expound the use and advantages of large size of pulse and bag dust eliminator in the electric-arc furnaces smoke purification system .

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To sum up there are some original and innovative points as follows : 1 . Analyze the influence of random phase error on pulse compressing of LFM and put forward a SVD and rotation of Ambiguity Function to remove the noise or better the compressing effect .

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They are the property of sum and difference beams the errors of the elements and channels and different pulse repeating frequency ( PRF ) .

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