Four-channel broadband compact multi-antenna GNSS downconverter for high-reliability navigation

IF 2.7 4区工程技术 Q2 TRANSPORTATION SCIENCE & TECHNOLOGY Transportation Safety and Environment Pub Date : 2023-06-01 DOI:10.1093/tse/tdad029

Riyan Wang, Bin Li, Hongyin He, Kunming Yang, Wei Feng, Zhijian Chen

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Abstract

A high-reliability broadband high-linearity down-converter for multi-antenna Global Navigation Satellite System (GNSS) receiver is presented in this paper. Based on direction-of-arrival estimation, the multi-antenna GNSS receiver can separate the GNSS signals from the interfering signals and suppress harmful wideband radio frequency (RF) interferences. To drive the off-chip 50Ω resistive load and meet the stringent requirements of linearity, a quad-channel down-converter with a broadband common-gate low-noise transconductance amplifier (LNTA), current-driven passive mixer and novel bridge mode transimpedance driving amplifier has been proposed to contruct the multi-antenna receiver. The operating frequency of this down-converter is from 1.15 to 1.65 GHz, covering all bands for GPS/BDS/GLONASS/Galileo. The measured results show that the proposed quad-channel down-converter achieves +38 dBm output 3rd order intercept point (OIP3) and +17 dBm OP1dB (output-referred 1 dB compression point), 9.5–12.9 dB noise Fig. (NF) across the variable gain of 10-27 dB, and approximately 47 dB channel isolation.

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用于高可靠性导航的四通道宽带紧凑型多天线GNSS下变频器

本文提出了一种适用于多天线全球导航卫星系统（GNSS）接收机的高可靠性宽带高线性下变频器。基于到达方向估计，多天线GNSS接收器可以将GNSS信号与干扰信号分离，并抑制有害的宽带射频（RF）干扰。为了驱动片外50Ω电阻负载并满足严格的线性要求，提出了一种采用宽带共栅低噪声跨导放大器（LNTA）、电流驱动无源混频器和新型桥式跨阻驱动放大器的四通道下变频器来构建多天线接收机。该下变频器的工作频率为1.15至1.65 GHz，覆盖GPS/BDS/GLONASS/Gileo的所有频段。测量结果表明，所提出的四通道下变频器在10-27 dB的可变增益范围内实现了+38 dBm输出三阶截距点（OIP3）和+17 dBm OP1dB（输出参考1 dB压缩点）、9.5–12.9 dB噪声图（NF）和大约47 dB的通道隔离。

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