描述
HD CSAC低功率10MHz GPSDO是从HD CSAC GPSDO演变而来的，但具有完全不同的系统设计，可将功耗降低60%以上。它通过单个+5V电源工作，当处于外部1PPS锁定模式或GPS禁用的保持模式时，通常功耗低至0.42W。启动GPS后，功耗可低于0.55W。除了5V工作电压外，HD CSAC低功率GPSDO还提供了与流行的HD CSAC GPSDO单元相同的功能，但增加了多种功能，如3.3V CMOS 1PPS输出，CSAC插座以便轻松升级CSAC振荡器，TTL电平串行端口，其可以完全独立于RS-232电平串行端口操作，低功率保持模式下，不需要GPS接收时切断GPS接收机的电源。
特点
- 小于45W功率（保持模式）
- 兼容HD CSAC
- 5V供电
- TTL和RS232串口，CSAC扩展插座
- 尺寸：2.0 X 2.5 X 0.7 英寸
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 +75°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, 3.3V CMOS output | |||
| 10MHz Outputs | 10MHz LVDS, 10MHz CMOS 3.3V | |||
| RS-232 and TTL serial ports | Independent RS-232 and TTL ports, 9.6K, 19.2K, 38.4K, 57.6K, 115.2K | |||
| RS-232 and TTL 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 | <130s at +25°C to <5E-010 Accuracy Typ. | |||
| Supply Voltage (Vdd) | +5V ±5% | |||
| Power Consumption | <0.45W holdover or external 1PPS mode, <0.55W with GPS enabled | |||
| 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 | CSAC oscillator socketed for easy upgrade | |||
| Phase Noise | 10Hz | -75dBc/Hz | ||
| 100Hz | -115dBc/Hz | |||
| 1KHz | -128dBc/Hz | |||
| 10kHz | -134dBc/Hz | |||
| 100kHz | -140dBc/Hz | |||
