描述
极小的仅一英寸见方的Micro-Transcoder模块可以无痕改造现有的GPS设备，以升级客户的GPS系统获得安全可靠的PNT能力。Micro-Transcoder模块是全星座、独立的实时10通道GPS模拟器。
通过将模块拼接在现有天线和用户的GPS接收机之间，Micro-Transcoder模块可实现用户GPS设备的固化，并且获取任何安全PNT源（例如INS、SAASM、M-码或并发GNSS接收器）的输出，并将基带PNT和UTC定时信息编码（RF调制）为标准GPS L1 RF信号。这个RF信号可以被任何传统GPS接收机接收。Micro-Transcoder模块可以充当GPS防火墙，以识别和阻止干扰和欺骗企图，并在完全拒绝GPS的操作期间提供备用PNT源。该部件基于流行的JLT CLAW GPS模拟器和RSR转码器™ 技术，包括一个独立的全星座10通道实时GPS模拟器，具有集成的高稳时钟参考，以及一个用于监测RF输出信号质量和准确性的内部GNSS接收器。通过简单地3.3V电源来即可传输标准UTC时间、位置、速度和航向GPS L1 RF信号。
Micro-Transcoder模块也可以作为一个通用的高性能GPS模拟器操作，内置GPS驯服振荡器（GPSDO），并由可从JLT网站下载的全面免费Windows应用程序支持。Windows应用程序允许控制所有模拟方面，创建和存储模拟矢量命令，并测试用户设备的闰秒和GPS周滚动事件兼容性，以确定用户设备的弱点。无需连接电脑即可正常工作。这使得嵌入式操作变得简单，就像通电一样， RF输出连接到任何GPS接收机的天线输入。
通过其两个串口和1PPS端口接收基带NMEA或SCPI PNT信息以及外部1PPS定时脉冲，并且可以通过串口直接连接到外部GNSS或INS PNT源。然后，将这些基带PNT信号转码为GPS L1 RF信号，其延迟通常小于100ms。UTC 1PPS定时传输精度通常优于5ns。仅需3.3V即可工作，设置和位置信息可选择性存储在内部NV存储器中。
特点
- 嵌入式NMEA编码到GPS L1 RF
- 将传统GPS系统升级为INS、SAASM、M-码、并行GNSS
- 可以作为GPS防火墙系统工作，以加强抵御欺骗和干扰
- 尺寸0.97 x 0.97 x 0.4英寸，功耗0.95W
- 也可作为低成本通用GPS模拟器
- 客户GPS接收器的Leapsecond和Week Number滚动测试
- 5ns定时和1m定位精度标准。
技术参数
| Module Specification: | |
| Applications: | l Retrofitting legacy GPS systems with SAASM, M-Code, CSAC-Holdover, Glonass, Galileo, BeiDou, Iridium-STL, or Inertial Navigation System
l 10-channel GPS simulation for manufacturing of GPS receivers, especially timing-related GPS l Low-Cost general-purpose Laboratory GPS-Simulation for R&D |
| Features: | l Generates a GPS L1-C/A code RF-output as if the signal where coming from a Live-Sky GPS antenna. Full-constellation GPS RF output
l Compatible to SAASM receivers (L-3, Rockwell Collins, and others) and Iridium-STL receivers l Low-latency NMEA position to GPS RF-Output encoding (<100ms) l Add INS capability to existing GPS legacy equipment l Encodes time with nanosecond accuracy for GPS Timing Receivers l 10MHz and 1PPS output, as well as 1PPS external ref. timing input l Built-In high-stability TCXO l Powered by 3.3V, 0.95W typical l Built-in GNSS receiver for monitoring RF output quality and accuracy l Glueless connection to Rockwell Collins RSR SAASM GPS Puck, and u-Blox GNSS receivers as the PNT reference via COM2 serial port l Fully controllable via SCPI commands l Connects gluelessly to external GNSS receiver or PNT source l Plug-and-Play: just plug in power, and the module will start the simulation and RF-output by itself |
| Data/Power connectors | Standard DIP 100mil footprint, can be soldered or socketed into customer PCB |
| Built-in GNSS monitoring receiver | 72 channel gen-8 GNSS receiver |
| Outputs | One 3.3V CMOS 1PPS output, one 10MHz CMOS 3.3V output, disciplined by external 1PPS reference, One RF GPS L1 C/A code, -105dBm to -128dBm |
| Spectral Purity (1MHz to 13.2GHz) | < -30dBc in-band (L1, +/-20MHz), < -70dBm out-of-band |
| Harmonics of L1 (1.57542GHz) | < -140dBm |
| Serial Control | SCPI-99 Control at 9.6K, 19.2K, 38.4K, 57.6K, 115.2K |
| External GNSS receiver compatibility | Any NMEA compatible source, direct control of Rockwell Collins GB-GRAM and MicroGRAM SAASM GPS, and u-Blox GNSS receivers, supports Satelles/Iridium-STL receivers |
| SCPI Control/Monitoring Port | Compatible to any terminal program, SimCon, and GPSCon, NMEA output sentences |
| Operating Temperature | -40°C to +75°C |
| MTBF | > 600,000 Hours |
