Effects of Sampling Rate on STAP-Based RFI Suppression Systems

2006 IEEE Antennas and Propagation Society International Symposium Pub Date : 2006-10-23 DOI:10.1109/APS.2006.1710817

M. Rankin, A. O'Brien, I. Gupta

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引用次数: 2

Abstract

In this paper, the effects of sampling rate on the performance of the space-time adaptive processing (STAP)-based RFI suppression system is studied when the performance metric consists of pre-correlator performance (output SNR) as well as the post-correlator performance (peak-to-peak ratio and distortion of the cross-correlation function). It is shown that for good performance, the sampling rate should be selected below or equal to the system bandwidth (front end of the antenna electronics). In general, the sampling rate is greater than the system bandwidth which leads to performance degradation. For these situations, a resampling procedure is presented which can be used effectively to reduce the sampling rate to below or equal to the system bandwidth. It is shown that when the resampled data is used in STAP, one obtains good performance. The resampling procedure consists of two steps. First, a low-pass filter is applied to the data. The bandwidth of the low-pass filter is selected to be between the desired signal bandwidth and the system bandwidth. Next, the signals are resampled to match the low-pass filter bandwidth. The antenna array and the signal scenario used in the study is described next

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采样率对基于stap的RFI抑制系统的影响

本文研究了在预相关性能(输出信噪比)和后相关性能(峰峰比和互相关函数失真)组成的性能指标下，采样率对基于空时自适应处理(STAP)的RFI抑制系统性能的影响。结果表明，为了获得良好的性能，采样率的选择应低于或等于系统带宽(天线电子前端)。一般情况下，采样率大于系统带宽，会导致性能下降。针对这些情况，提出了一种重采样方法，可以有效地将采样率降低到小于或等于系统带宽。结果表明，将重采样的数据用于STAP，可以获得良好的性能。重采样过程包括两个步骤。首先，对数据应用低通滤波器。低通滤波器的带宽选择在期望的信号带宽和系统带宽之间。接下来，对信号进行重采样以匹配低通滤波器带宽。接下来介绍了研究中使用的天线阵列和信号场景

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2006 IEEE Antennas and Propagation Society International Symposium

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