资 源 简 介
The Challenges of Indoor PosiTIoning
测量位置是一个巨大的成功,户外导航系统,有一个强大的推动,重复室内。能够找到一个人在建筑物内可以帮助许多不同的方式,从找到合适的办公室在一个塔块找到一个所需的部门,甚至一个特定的产品在商店,或提供有针对性的交易,你走在超市周围。
不幸的是,通过GPS卫星定位技术、卫星或即将到来的伽利略系统不能满足即使名义提高测量精度下降到1米作为接收机的多径信号的斗争,不见卫星室内定位的要求。
由欧洲GNSS机构测试(GSA)和RX网络性能测量伽利略使用时与在现实世界环境中,GPS和GLONASS的各种组合,包括市区和室内,使用一个多星座GNSS接收机。虽然使用伽利略,或多颗卫星,帮助在城市峡谷户外,结果表明,室内性能仍然不佳(图1)。
However, satellite coverage is one key technology, and the MAX2769 from Maxim also covers GPS, GLONASS, and Galileo navigaTIon satellite systems on a single chip that can be integrated into wearable and portable designs. This single-conversion, low-IF GNSS receiver uses a low-power SiGe BiCMOS process technology to provide high performance and integraTIon at a low cost.
Incorporated on the chip is the complete receiver chain, including a dual-input LNA and mixer, followed by the image-rejected filter, PGA, VCO, fracTIonal-N frequency synthesizer, crystal oscillator, and a multibit ADC. The total cascaded noise figure of this receiver is as low as 1.4 dB that can help provide increased sensitivity for indoor use.