描述
HD CSAC GPSDO基于Jackson Labs的 CSAC（芯片级原子钟）GPSDO平台，但通过删除CSAC GPSSDO的一些通用功能来优化尺寸、重量和功率（SWAP）。HD CSAC是为移动应用而设计的，如单人背包、机载和车载应用。HD CSAC GPSDO提供用于命令和控制的RS-232串行端口，并通过+12V电源工作。它包括CMOS和LVDS 10MHz输出，以及一个LVDS 1PPS输出。它与FireFly II板功能兼容，并共享相同的IO连接器，同时大幅降低功耗并提高性能，尤其是在GPS保持期间。HD CSAC GPSDO支持移动模式GPS接收机，具有50个信道和SBAS（WAAS/EGNOS/MSAS）支持，并具有优于-160dBm的跟踪能力。HD CSAC支持行业标准NMEA输出语句，以及SCPI控制和命令接口。该板有标准温度版本，以及-10℃至+70℃温度范围的扩展温度版本。
特点
- 为移动应用设计
- 使用芯片级原子钟（CSAC）保持，预热时间小于2分钟
- CMOS和LVDS 10MHz 输出， 1PPS LVDS 输出
- 非常小的尺寸和功耗。尺寸，2.0 X 2.5 X 0.7 英寸；功耗1.2W。
技术参数
| Module Specification: | ||||
| Long-Term Oscillator Aging (without GPS -Zero aging with GPS) | Less than 0.3ppb per month in Holdover without GPS | |||
| Frequency Stability Over Temperature | Better than ±0.5E-09 (CSAC only, no GPS Disciplining, 0°C to +70°C) | |||
| 1 PPS Accuracy | ±15ns to UTC RMS (1-Sigma) GPS Locked in Position Hold mode | |||
| Frequency Accuracy | Better than ±2E-010 after 3 minutes operation with GPS lock | |||
| Holdover Drift (after 5 minute warmup with GPS lock) | <±2.5us drift per hour over worst case temperature range | |||
| Typical Holdover Drift (after 5 minute warmup with GPS lock) | <±1us drift per hour at 25°C ±5°C | |||
| ADEV (with GPS lock) | 1s: <1E-10, 10s: <2.5E-11, 100s <2E-11, 1Ks: <1E-11, 10Ks: <2E-12 | |||
| 1 PPS Output (CSAC Flywheel Generated) | LVDS output, can be shifted in 1ns steps relative to UTC | |||
| 10MHz Outputs | 10MHz LVDS, 10MHz CMOS 5V | |||
| RS-232 Control (Including USB Port) | Full SCPI-99 Control Commands at 9.6K, 19.2K, 38.4K, 57.6K, 115.2K | |||
| RS-232 NMEA Output Sentences | NMEA 0183 rev. 2.3, Sentences: GGA, RMC, ZDA, PASHR, and others | |||
| External GPS option | 1PPS input for optional external SAASM GPS receiver | |||
| GPS Frequency, Antenna | L1 C/A 1574MHz, Passive or Active Antenna 3.3V, MMCX Connector | |||
| GPS Receiver | 50 Channels, Mobile, SBAS: WAAS, EGNOS, MSAS supported | |||
| Sensitivity | Acquisition -147 dBm, Tracking -160 dBm | |||
| GPS Time To First Fix | Cold Start – <30 sec, Warm Start – 1 sec, Hot Start – 1 sec | |||
| GPS Receiver Motion Adaptive Filter Settings (dynamic mode enabled) | Optimized depending on vehicle velocity (Auto-sensing, Auto-switching) | |||
| TTL Alarm Output | Hardware Event Indicator | |||
| Warm Up Time / Stabilization Time Without GPS | <180s at +25°C to <5E-010 Accuracy Typ. | |||
| Supply Voltage (Vdd) | +12V ±5% | |||
| Power Consumption | <1.25W at +25°C | |||
| Operating Temperature | -10C to +70C | |||
| g-sensitivity | <0.2ppb per-g per-axis | |||
| Magnetic Sensitivity | Less than 0.4ppb per Gauss | |||
| Storage Temperature | -45°C to +85°C | |||
| MTBF | > 100,000 Hours | |||
| Connectors | Compatible to FireFly-IIA connector | |||
| Phase Noise | 10Hz | -75dBc/Hz | ||
| 100Hz | -115dBc/Hz | |||
| 1KHz | -128dBc/Hz | |||
| 10kHz | -134dBc/Hz | |||
| 100kHz | -140dBc/Hz | |||
