Trimble R4 GPS Receiver
Basic engineering specifications:
| Number of channels | 72 channels |
| Reception of signals | Options of GPS L1/L2, RTK, Glonass |
| Type | GPS-receiver of geodesic class |
| RTK mode | option |
| Standard antenna | TRIMBLE A3 |
| Opportunity of modernization | RTK, Glonass |
| Purpose | post-processing with accuracy in centimeters |
| Intialization time | <25 seconds |
Accuracy (RMS deviation) in postprocessing
| Statics in plan | ±3.0 mm + 0.1 mm/km |
| Statics according to height | ±3.5 mm + 0.4 mm/km |
| Kinematics in plan | ±8 mm + 1 mm/km |
| Kinematics according to height | ±15 mm + 1 mm/km |
Accuracy (RMS deviation) in real-time (RTK)
| Kinematics (phase) in plan: | ±8 mm + 0.5 mm/km |
| Kinematics (phase) according to height: | ±15 mm + 0.5 mm/km |
| Data writing | |
| Memory | internal |
| Capacity | 11 megabytes |
| Frequency of writing | 1, 2, 5 and 10 Hz |
Operating conditions:
| Humidity | 100 % accompanied with condensation |
| Protection against water, dust, and sand | P67, protection against short-time submersion into water at depth of 1 m |
| Protection agains vibration | MIL-STD-810F, FIG 514 5C-1 |
| Operation temperature | From –40 º to +65 °C |
| Falling | In no-operation it stands falling from landmark of 2 m high on concrete. In operation: 40 g at most, 10 ms, and saw-toothed В робочому стані: до 40 G, 10 мс, пилообразно |
Weight and dimensions:
| Weight of receiver | 1.34 kg including internal battery and standard стандартную antenna of metric waves |
| Dimensions of receiver | 19.0 x 215.0 x 10.9 см including connectors |
| Weight of complete set | 3.70 kg, RTK-rover in assembly including battery, landmark, controller, and bracket |
Advantages of this type of GPS-receiver
- The Trimble R-Track™ technology;
- The advanced GNSS-chip, which is named as TrimbleMaxwell™ 5 CustomSurvey and equipped with 72 channels;
- The high-accuracy multiple correlators for measuring the GNSS pseudo-ranges;
- Measurements of GNSS phases of carrier frequencies, which are notable for very low noise level and accuracy <1 mm in the frequency range of 1 Hz;
- The signal-noise relation is indicated in dB and Hz;
- The Trimble field-approved technology for tracking satellites with small angle of elevation;
- Capability to track signals of satellites simultaneously.