（4）Supported GNSS augmentation systems（支持 GNSS 增强系统）

Quasi-Zenith Satellite System (QZSS)（准天顶卫星系统（QZSS））

The Quasi-Zenith Satellite System (QZSS) is a regional navigation satellite system that provides positioning services for the Pacific region covering Japan and Australia. The ZED-F9K high precision receiver is able to receive and track QZSS signal concurrently with GPS signals, resulting in better availability especially under challenging signal conditions, e.g. in urban canyons.

准天顶卫星系统（QZSS）是一个区域导航卫星系统，为覆盖日本和澳大利亚的太平洋地区提供定位服务。ZED-F9K高精度接收机能够同时接收和跟踪QZSS信号和GPS信号，从而提高可用性，尤其是在具有挑战性的信号条件下，例如在城市峡谷中。

The ZED-F9K is also able to receive the QZSS L1S signal in order to use the SLAS (Sub-meter Level Augmentation Service) which is an augmentation technology that provides correction data for pseudoranges. Ground monitoring stations positioned in Japan calculate independent corrections for each visible satellite and broadcast this data to the user via QZSS satellites. The correction stream is transmitted on the L1 frequency (1575.42 MHz).

ZED-F9K还能够接收QZSSL1S信号，以便使用SLAS（亚米级增强服务），这是一种为伪距提供校正数据的增强技术。位于日本的地面监测站计算每个可见卫星的独立校正数据，并通过QZSS卫星将这些数据广播给用户。校正数据流在L1频率(1575.42MHz)上传输。

QZSS can be enabled only if GPS operation is also configured.

只有同时配置了GPS操作，才能启用QZSS。

准天顶卫星系统（Quasi-Zenith Satellite System；缩写：QZSS）是以三颗人造卫星透过时间转移完成全球定位系统区域性功能的卫星扩增系统。

Satellite based augmentation system (SBAS)（星基增强系统(SBAS)）

The ZED-F9K high precision receiver optionally supports SBAS (including WAAS in the US, EGNOS in Europe, MSAS in Japan and GAGAN in India) to deliver improved location accuracy within the regions covered. However, the additional inter-standard time calibration step used during SBAS reception results in degraded time accuracy overall.

SBAS reception is enabled by default in ZED-F9K.

SBAS（Satellite-Based Augmentation System），即星基增强系统，通过地球静止轨道（GEO）卫星搭载卫星导航增强信号转发器，可以向用户播发星历误差、卫星钟差、电离层延迟等多种修正信息，实现对于原有卫星导航系统定位精度的改进，从而成为各航天大国竞相发展的手段。全球已经建立起了多个SBAS系统，如美国的WAAS（Wide Area Augmentation System）。

Differential GNSS (DGNSS)（差分GNSS(DGNSS)）

When operating in RTK mode, RTCM version 3.3 messages are required and the module supports DGNSS according to RTCM 10403.3. ZED-F9K can decode the following RTCM 3.3   messages:

在RTK模式下运行时， RTCM 3.3版的信息是必要的，本模块支持RTCM 10403.3规定的DGNSS系统。ZED-F9K可以解码以下RTCM 3.3信息：

（5）Broadcast navigation data and satellite signal measurements（广播导航数据和卫星信号测量）

The ZED-F9K can output all the GNSS broadcast data upon reception from tracked satellites. This includes all the supported GNSS signals plus the augmentation service QZSS. The UBX-RXM-SFRBX message contains this information. The receiver also makes available the tracked satellite signal information, i.e. raw code phase and Doppler measurements, in a form aligned to the Radio Resource LCS Protocol (RRLP).For the UBX-RXM-SFRBX message specification, see the u-blox ZED-F9K Interface description.

ZED-F9K可以在接收到跟踪卫星后输出所有GNSS广播数据。这包括所有支持的GNSS信号以及增强服务QZSS。UBX-RXM-SFRBX消息包含此信息。接收器还以符合无线电资源LCS协议(RRLP)的形式提供跟踪的卫星信号信息，即原始码相位和多普勒测量值。有关UBX-RXM-SFRBX消息规范，请参阅u-blox ZED-F9K接口说明。

Carrier-phase measurements（载波相位测量）

The ZED-F9K modules provide raw carrier phase data for all supported signals, along with pseudorange, Doppler and measurement quality information. The data contained in the UBX-RXM- RAWX message follows the conventions of a multi-GNSS RINEX 3 observation file. For the UBX- RXM-RAWX message specification, see the u-blox ZED-F9K Interface description.

ZED-F9K模块为所有支持的信号提供原始载波相位数据，以及伪距、多普勒和测量质量信息。UBX-RXM-RAWX消息中包含的数据遵循多GNSS RINEX 3观测文件的约定。有关UBX-RXM-RAWX消息规范，请参阅u-blox ZED-F9K接口说明。

Raw measurement data are available once the receiver has established data bit synchronization and time-of-week.

一旦接收器建立了数据位和周时间同步，原始测量数据就可用。

Only available with an optional license for an additional cost.

仅适用于附加费用的可选许可证。

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