Abstract
In sky-wave over-the-horizon radar system, it is difficult to detect ship because the Doppler shift of the ship is very close to the strong ocean clutter. Traditional clutter cancellation algorithms suppress ocean clutter by estimating clutter parameters and removing the clutter signal in time domain. However, they estimate the clutter parameters by the maximum value of the post DFT spectrum and thus lead to the low accuracy. In this paper, a modified clutter cancellation algorithm is proposed, which corrects estimated frequency by utilizing the three maximum spectrum values and overcomes the poor cancellation performance caused by inaccurate estimation of clutter parameters. Compared with traditional clutter cancellation algorithm, the proposed algorithm can get more accurate clutter parameters and reduce the energy and expansion of the remaining clutter. Simulation demonstrated that the proposed algorithm had a better clutter cancellation performance compared to the traditional ones.
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