CEEBASE™
Highly Accurate GNSS Base Station
The CEEBASE™ is a ruggedised highly accurate and simple to use GNSS base station with a built in rechargeable battery.
It was designed to provide local RTCM correction signals for one or more roving GNSS receivers, generally for the purposes of hydrographic surveying.
The CEEBASE™ GNSS Base Station has been designed and manufactured using high quality components to withstand harsh weather environments and is encased in a virtually indestructible Pelican case.
The CEEBASE™ contains a high accuracy GNSS receiver for generating RTCM messages and a built in UHF radio modem. The GNSS will provide either RTCMv2.0 data for DGPS (sub metre positioning) or RTCMv3.0 for RTK (centimetre positioning).
The CEEBASE™ unit has an internal rechargeable battery or can be connected to an external power source to run for extended periods between recharging.
Specifications
> CEEBASE™ Specifications
| Physical |
| Dimensions |
36.5 x 29.5 x 15.5 cm (L x W x D) |
| |
14.37" x 11.61" x 6.10" |
| Display |
2 x 20 character Jumbo LCD with contrast control |
| Weight |
6.5 kg (14.34 lbs) |
| Colour |
Pelican Yellow |
| Connectors |
LEMO 1B series, TNC (GPS), BNC (telemetry) |
| Environmental |
| Operating temperature |
0°C-50°C (32°F-122°F)
|
| Humidity |
95% non condensing
|
| Ingress protection rating |
IP65 |
| Power |
| Power consumption (combined GNSS and telemetry) |
9 watts (approx operating time 12+ hours) |
| Internal battery |
Rechargeable high capacity NiMH batteries 20Ah
|
| Antenna voltage output |
5.0 VDC |
| External power supply |
Nominal 12.0 VDC @ 2A (9-24 VDC range) |
| Telemetry Module Options |
| UHF |
Range 1-10 km (0.6-6.2 miles) |
Frequency Range
|
330-470 MHz
|
Tuning Range
|
+/- 2 MHz from central frequency
|
Channel Spacing
|
12.5 kHz / 20 kHz / 25 kHz
|
Number of Channels
|
160 / 100 / 80 (or 2 x 160 / 100 / 80) *Note1
|
Frequency Stability
|
< ± 1.5 kHz
|
Type of Emission
|
F1D
|
Communication Mode
|
Half-Duplex
|
| CEELINK Modem |
| Dimensions |
24.5 x 19.5 x 11.5 cm (L x W x D) |
| |
9.65" x 7.68" x 4.53" |
| Display |
LCD |
| Weight |
3 kg (6.61 lbs) |
| Connectors |
LEMO 1B series, BNC (telemetry) |
| Operating temperature |
0°C-50°C (32°F-122°F) |
| Humidity |
95% non condensing |
| Ingress protection rating |
IP65 |
| Power consumption |
1.7 watts (approx operating time 30+ hours) |
| Internal battery |
Rechargeable high capacity NiMH battery 10Ah |
| External power supply |
Nominal 12.0 VDC @ 2A (9-24 VDC range) |
Transmitter
|
Carrier Power
|
10 mW-1 W / 50 ohm
|
Carrier Power Stability
|
+ 2 dB / - 3 dB
|
Adjacent Channel Power
|
according to EN 300 220-1 / EN 300 113-1
|
Spurious Radiations
|
according to EN 300 220-1 / EN 300 113-1
|
Receiver
|
Sensitivity
|
< -115 dBm (BER < 10 E-3) *Note2
|
Co-channel rejection
|
> - 12 dB
|
Adjacent channel selectivity
|
> 60 dB @ 12.5 and 20 kHz @ > 70 dB 25 kHz
|
Intermodulation attenuation
|
> 65 dB
|
Spurious radiations
|
< 2 nW
|
Data Modem
|
Interface
|
RS-232, RS-485 or RS-422
|
Interface Connector
|
D15, female
|
Data speed of RS interface
|
300 - 38400 bps
|
Data speed of radio interface
|
19200 bps @ 25 kHz, 9600 bps @ 12.5 / 20 kHz
|
Data format
|
Asynchronous RS-232, RS-422, RS-485 |
GNSS Receiver Options
> Hemisphere Crescent L1
| GPS Specifications |
| Receiver Type: |
L1, C/A code, with carrier phase smoothing |
| Channels: |
12-channel, parallel tracking (10-channel when tracking SBAS) |
| SBAS Tracking: |
2-channel, parallel tracking |
| Update Rate: |
2 Hz maximum |
| Horizontal Accuracy: |
<0.6 m 95% confidence (DGPS1)
|
| |
<2.5 m 95% confidence (autonomous, no SA1)
|
Cold Start:
|
60 s (no almanac or RTC)
|
Warm Start:
|
45 s (valid almanac and RTC)
|
Hot Start:
|
20 s (valid almanac, RTC, and <2 hours since last fix)
|
Reacquisition:
|
<1 s
|
Maximum Speed:
|
1607 kph (999 mph)
|
Maximum Altitude:
|
18,288 m (60,000 ft)
|
> Hemisphere Eclipse L1/L2
| Receiver Type: |
L1, C/A code, with carrier phase smoothing |
| Channels: |
24 channels L1, 12 channels L2
|
| SBAS Tracking: |
2-channel, parallel tracking |
| Update Rate: |
2 Hz maximum |
| Horizontal Accuracy: |
RMS (67%) |
2DRMS (95%) |
| RTK1,2,3 |
1 cm + 1 ppm |
2 cm + 1 ppm |
OmniSTAR HP1
|
0.10 m |
0.20 m |
SBAS (WAAS)1
|
30 cm |
60 cm |
| Autonomous, no SA1 |
1.2 m |
2.5 m |
| Cold Start Time: |
<60 s |
| Warm Start Time: |
1: 30 s (valid ephemeris) |
| Warm Start Time 2: |
30 s (almanac and RTC) |
| Hot Start Time: |
10 s typical (valid ephemeris and RTC) |
| Reacquisition: |
<1 s |
| Maximum Speed: |
1607 kph (999 MPH) |
| Maximum Altitude: |
18,288 m (60,000 ft) |
1 Depends on multipath environment, antenna selection, number of satellites in view,
satellite geometry, and ionospheric activity.
2 Up to 5km baseline length.
3 Depends also on baseline length.
> Novatel OEM628 L1/L2/L5
| Channel Configuration |
120 Channels with flexible configuration1 including:
|
GPS: L1, L2, L2C, L5
|
|
GLONASS: L1, L2
|
|
Galileo: E1, E52
|
|
| GIOVE-A/GIOVE-B (test) |
|
Compass3
|
|
SBAS
|
|
| L-band |
|
| Horizontal Position Accuracy (RMS) |
Single point L1
|
1.5 m
|
Single point L1/L2
|
1.2 m
|
SBAS4
|
0.6 m
|
CDGPS4
|
0.6 m
|
DGPS
|
0.4 m
|
OmniSTAR
|
|
VBS
|
0.6 m
|
XP
|
0.15 m
|
HP
|
0.1 m
|
RT-205
|
0.2 m
|
RT-2
|
1 cm+1 ppm
|
Initialization time
|
<10 s
|
Initialization reliability
|
> 99.9%
|
Measurement Precision (RMS)
|
| Fully independent code and carrier measurements: |
| |
GPS |
GLO |
L1 C/A code
|
4 cm
|
8 cm
|
L1 carrier phase
|
0.5 mm
|
1.0 mm
|
L2 P(Y) code6
|
8 cm
|
8 cm
|
L2 carrier phase6
|
1.0 mm
|
1.0 mm
|
L2C code7
|
8 cm
|
8 cm
|
L2C carrier phase7
|
0.5 mm
|
0.5 mm
|
L5 code
|
3 cm
|
- |
L5 carrier phase
|
0.5 mm
|
- |
Maximum Data Rate8
|
Measurements
|
100 Hz
|
Position
|
100 Hz
|
1 Tracks up to 60 L1/L2 satellites.
2 Includes E5a, E5b and Alt-BOC.
3 The Compass signal is not finalized and changes in the signal structure may still occur.
Designed for Compass Phase 3 compatibility.
4 GPS only.
5 Expected accuracy after static convergence.
6 L2 P for GLONASS.
7 L2 C/A for GLONASS.
8 100 Hz while tracking up to 20 satellies.
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