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首页> 外文期刊>IEEE Transactions on Aerospace and Electronic Systems >Implementation of Mixing Sequence Optimized Modulated Wideband Converter for Ultra-Wideband Frequency Hopping Signals Detection
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Implementation of Mixing Sequence Optimized Modulated Wideband Converter for Ultra-Wideband Frequency Hopping Signals Detection

机译：用于超宽带跳频信号检测的混合序列优化调制宽带转换器的实现

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摘要

Frequency hopping (FH) communications are widely used in Satcom systems. The latest FH systems have exceeded 3 GHz with hop rates up to 100 000 hops/s. Traditional spectrum sensing systems hardly monitor such signals. Modulated wideband converter (MWC) is an emerging compressive sampling structure applied to sample multiband signals. This article analyses the effects of the nonlinearity of analog devices and proposes an optimization method based on a greedy algorithm for mixing sequences to make reconstruction performance uniform across sub-bands. To correct the errors caused by the nonideality of analog front end circuits between the theoretical sensing matrix and the practical one, we also develop a calibrating method that obtains all the sensing matrix coefficients through a single measurement. In conventional MWC, out-band noise will be blended during reconstruction. Instead of matrix factorization, we reserve signal characters and designed sliding filters to improve narrowband signals reconstruction sensitivities. We produced a four-branch MWC principle prototype for FH signal detection. The sensing bandwidth is 3 GHz, and the sampling rate is 400 MHz, whereas the reconstruction sensitivity is as low as 13-dB in-band signal-to-noise.
机译：跳频（FH）通信广泛用于卫星系统。最新的FH系统已超过3 GHz，跃点率高达100 000千ps/ s。传统的频谱传感系统几乎不会监控这些信号。调制宽带转换器（MWC）是应用于样本多频带信号的新兴压缩采样结构。本文分析了模拟设备非线性的影响，并提出了一种基于贪婪算法的优化方法，用于混合序列，使跨子带的重建性能均匀。为了校正理论传感矩阵与实用的模拟前端电路的非缺陷引起的错误，我们还开发了一种校准方法，该方法通过单个测量来获得所有感测矩阵系数。在传统的MWC中，在重建期间将混合带外噪声。而不是矩阵分解，我们保留信号字符和设计的滑动滤波器以改善窄带信号重建敏感性。我们为FH信号检测生产了四分支MWC原理原型。感测带宽为3 GHz，采样率为400 MHz，而重建敏感度低至13dB带内信噪比。

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