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首页> 外文期刊>IEE proceedings. Radar, sonar and navigation >DireCtion finding on spread-spectrum signals using the time-domain filtered cross spectral density
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DireCtion finding on spread-spectrum signals using the time-domain filtered cross spectral density

机译：使用时域滤波后的互谱密度对扩频信号进行定向发现

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摘要

In an earlier paper, it was shown that spread-spectrum signals of arbitrary unknown waveform could be detected at received powers well below the receiver noise level, by crosscorrelating the signals from two spatially separated antennas, windowing the crosscorrelation function (CCF) over a narrow range about zero time shift and taking its Fourier transform, thus forming the time-domain-filtered cross spectral density (TDFCSD). The authors show that, having detected the signal and established its bandwidth, it is possible to estimate its angle of arrival (AOA) by measuring the phase slope in the TDFCSD across the signal bandwidth. An analysis of the technique is presented showing how the direction finding (DF) accuracy varies with signal and receiver parameters. Computer simulation results show that, with an antenna spacing as low as 1 m, a DF error of less than 1° can be obtained on a signal with a bandwidth of 100MHz at a received power level lower than -100dBm, using an integration time of a few milliseconds. A practical system based upon an acousto-optic correlator capable of computing the CCF in real time is described. Preliminary results from the system show DF errors that are in good agreement with theory.
机译：在较早的论文中，通过将来自两个空间分离天线的信号互相关，在狭窄的窗口中对互相关函数（CCF）进行开窗，可以发现在远低于接收机噪声水平的接收功率下可以检测到任意未知波形的扩频信号。大约在零时移范围内进行傅立叶变换，从而形成时域滤波的交叉谱密度（TDFCSD）。作者表明，在检测到信号并确定其带宽之后，可以通过测量整个信号带宽中TDFCSD中的相位斜率来估计其到达角（AOA）。对该技术进行了分析，显示了测向（DF）精度如何随信号和接收器参数而变化。计算机仿真结果表明，在天线间距低至1 m的情况下，在积分功率为-100dBm且接收功率低于-100dBm的情况下，带宽为100MHz的信号可获得小于1°的DF误差。几毫秒。描述了一种基于声光相关器的实用系统，该系统能够实时计算CCF。该系统的初步结果表明，DF误差与理论吻合良好。

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