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CODAR
OCEAN SENSORS
SeaSonde® Remote Unit System Specifications
Product Code: SSRS-100
SeaSonde Remote Unit Components†
•
1 Transmit Antenna Assembly (SSTA) & 1 Receiver Antenna Assembly
(SSRA) OR,
1 Combined Transmit-Receive Antenna Assembly (SSTR) (avail.
for frequencies 11.5 MHz and higher)
•
1 Transmit Cable & 1 Receive Antenna Cable Set OR,
1 Combined Transmit-Receive Antenna Cable Set (avail. for frequencies
11.5 MHz and higher)
• 1 SeaSonde Receiver Chassis (SSRX)
• 1 SeaSonde Transmitter Chassis (SSTX)
• 1 Radial Site Data Acquisition System (SSDA 100)
• 1 Electronics Interconnector Cable Kit
• 1 Set Operator Instruction Manuals, PDF format
•
One Year Manufacturer’s Warranty
† Base components only: review Remote Unit
Configuration Options inside this specification sheet.
| Technical
Specifications |
Radiated Signal Specifications
Operators must adhere to local radiated signal regulations
and receive proper authorizations prior to operation.
Output Radiated Power:
80 W peak, 40 W average
Operating Frequency Range:
Electronics: 4.4 – 50 MHz
Antennas: Select from one of either:
4.4 - 6 MHz or
11.5 - 14 MHz or
24 - 27 MHz or
40 - 45 MHz or
custom: any other frequency between
4.4 - 50 MHz
Modulation Format:
Pulsed Swept Frequency CW
Sweep Width: 12-300 kHz (typical)
Pulse Repetition Frequency:
514 - 8224 Hz
Sweep Repetition Frequency: 1-4 Hz
Total Radiated Signal Bandwidth: (at -20dB level) 65-200
kHz
Polarization: Vertical
System Power Requirement (transmitter, receiver & computer):
350 watts (24V DC ver.) or 500 watts (120-220
VAC) |
 |
SSTX
SSRX |
| SSDA 100 |
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| TRANSMITTER |
RECEIVER |
Transmitter Chassis: SSTX
Input RF Drive Level: 0 dBm
Output RF Power Level: 100 watts peak, 50 watts average
Power Requirements: 300 watts;
(select one when ordering):
120 V AC, 50-60 Hz
220 V AC, 50-60 Hz
24 V DC
Design: (gated FET) modular; solid state
Operation: Class AB
Dimensions: (single chassis) 19” rack mountable, 3U tall;
13H x 49W x 53D (cm)
Weight: 15 kg
Temperature Range (ambient): 0° F (-18° C) to 90°F
(32° C)
Maximum Humidity: 80% non-condensing |
Receiver Chassis: SSRX
Maximum In-band Input Level: 0 dBm
Receiver Channel Impedance: 50 ohm
Sensitivity (noise level): -166 dBm in 1 Hz BW
Power Requirements: 100 watts;
(select one when ordering):
120 V AC, 50-60 Hz
220 V AC, 50-60 Hz
24 V DC
Design: modular, solid state, three-channel
Operation: I/Q homodyne
Output: USB digital output; digital data at
4096 16-bit/second per channel
Dimensions: (single chassis) 19” rack
mountable, 3U tall; 13H x 49W x 53D (cm)
Weight: 14 kg
[Optional “SHARE” GPS synchronization Feature:
GPS
assisted stability: >.0001 ppm and 50 nsec on PPS ]
Temperature Range (ambient): 0° F (-18° C) to 90°F
(32° C)
Maximum Humidity: 80% non-condensing
System Requirement: AC Power Conditioning via
Uninterruptable Power Supply (UPS).
Minimum
recommended UPS capacity: 1500 VA (1050 Watt) |
| ANTENNA CABLING |
Requirement- Cabling Protection:
Ideally cables between antennas and electronics are fed through
protective conduit (such as 3.5 cm diameter PVC pipe) and
buried in trench. There are lower cost options available, but
there will be greater risk to exposure and damage.
Transmit Cable
Type: Single Strand RG-8 Low loss Co-Ax, 75 m length
Receive Cable Set
Type: Quad strand RG-58 Low loss Co-Ax bundle,
100m length |
Combined Transmit - Receive Cable
Set
(for 11.5 MHz and higher frequency bands)
Type: 1 x RG-8 + 2 x RG-58 Low-loss Co-Ax bundle,
Length: 75m (optional custom lengths available)
|
|
ANTENNA ASSEMBLY |
Note: Antennas for operation at one frequency band
and bandpass filters for operation at two frequency bands are
included with
SeaSonde remote unit purchase. Antennas and filters for operation
at additional frequency bands can be purchased separately.
Requirement - Bases/Mountings for Antennas:
Antennas need to be mounted vertically secured to concrete concrete
pad (~ 1m x 1m 1m) or lashed/guyed to fencing or other
solid structure. Read SeaSonde Antenna Installation User's Guide
for examples. |
Receive Antenna Assembly
Consists of:
mast, dome loopstick antenna
unit &
vertical
element (set atop dome)
Durability: All-weather
Total antenna height:
4.3 - 5.4 MHz: approx. 6.5 m
11.5- 14 MHz: approx. 6.5 m
Design: passive vertical monopole,
two crossed
loops into
preamplifiers
Functionality: omnidirectional, adjustable
(in
software) from
1-360 degrees
Transmit Antenna
Durability: All-weather
Total height:
4.4- 5.3 MHz: approx. 8.6 m
11.5-14 MHz: approx. 8.6 m
Transmitting Design:
vertical monopole; omnidirectional |
Combined Transmit - Receive Antenna
Assembly
(for 11.5 MHz and higher frequency bands)
Consists of:
mast, dome loopstick antenna unit &
vertical element (set atop dome)
Durability: All-weather
Total antenna height:
11.5- 14 MHz: approx. 8 m
24-27 MHz: approx. 6.5 m
40-45 MHz: approx. 5.5 m
Receiving Design:
passive vertical monopole, two crossed loops into preamplifiers
omnidirectional, adjustable from 1-360 degrees
Transmitting Design: vertical monopole; omnidirection
|
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| Requirement – SeaSonde
Antenna Placement |
Clear Space Around RX and TX Antennas
Objects that interact with or alter the response of the transmit
or receive antennas
can affect bearing accuracy or create bearing gaps in coverage.
|
 |
• Position SeaSonde transmit or receive antennas
one horizontal RADAR
wavelength or greater away from tall (one quarter of the RADAR wavelength or
taller) objects or obstructions (see chart below). Tree trimming/removal, or
relocation of other man made objects may be necessary.
• There should be no obstructions between the receive antenna and the seaward
side that may block energy in direction of ocean.
• Position receive antenna one horizontal RADAR wavelength or greater away
from
a cliff or building edge (see chart above).
Requirement- Transmit Antenna Ground
Plane Dimensions
The Long-Range (4.3-5.4 MHz) SeaSonde Transmit antenna requires a ground plane.
If the antenna is attached to a metal
structure, such as on an oil platform or metal fence, then that object will act
as the grounding device. If it is to be installed on a
beach, for example, then grounding elements will need to fan out from the base
of the antenna towards sea. A minimum of 9
elements need to be placed in a 180º semi-circle on the seaward side of the antenna.
Each element is a metal wire encased in
plastic (~1/8” diam.), whose length is about 7-8 m. These elements can
be buried under sand or laid above ground.
Distance (Horizontal) from Water to Antennas
Antennas should be positioned close to the water to prevent propagation loss
of energy traveling over ground. Maximum
recommended distance from transmit or receive antenna to water is four RADAR
wavelengths (see above chart). |
| RADIAL SITE DATA ACQUISITION SYSTEM (SSDA 100) |
SSDA 100 Consists of:
Computer: select one of either mini-style or laptop computer
Monitor: color TFT
keyboard and mouse: USB, extended
Radial Suite Software License (individual site use)
Temperature Range: 0° F (-18° C) to 90°F (32° C)
for mini-style computer
Maximum Humidity: 80% non-condensing
Compatible Communications: 10/100/1000 Base-T
Ethernet (RJ-45 connector)
transfer of current, wave and diagnostic data products supported
by software
Communication Link Requirement
•
A reliable data communications link is required for:
•
Real-time data transmission,
•
Real-time system monitoring,
•
Proper system maintenance and customer support,
•
Remote software updates.
•
Minimum data bandwidth (upload and download each): 256 kbit/s. |
Radial Suite Software Data Products
Radial Surface Current Velocity Maps
Radial Map Display: color monitor screen, archived
ASCII vector files--
formatted to CODAR's LLUV columnar table format (MatLab® loadable).
Spatial Range (typical): 20-220 km offshore; 20-220 km alongshore
Range Resolution: user selectable from 200 m
- 12 km. Resolution is
based on transmit signal sweepwidth.
Angular Resolution: 1-5 degree grid: user selectable.
Current Accuracy: Varies with environment. rms
typical for normal environmental speed: < 7 cm/s of the total
current velocity and 1-2 cm of
the tidal component, direction < 10 degrees.
Doppler Cross Spectra
Binary files of HF sea echo spectra for three receive channels
(two crossloops&
vertical element). Raw and averaged are available for processing
into radial vector maps.
Range Processed Spectra (Range Series)
Optional binary files of receiver range processing which can
be processed
into Doppler cross spectra.
Raw I & Q voltages (Time Series)
Optional binary files of receiver analog measurements which can
be
processed into range spectra and Doppler cross spectra.
Wave Field Parameters
Local on-shore wave conditions in ring centered 3km from coast
around
each radar. Measurement range cell user-selectable.
Significant Waveheight. typical accuracy: 7-15%
Dominant on-shore Direction. typical accuracy: 5-12 degrees
Dominant Wave Period. typical accuracy: 0.6 s
Waveheight Energy vs. Frequency: ~0.01 Hz spacing
Dominant Wave Direction vs. Frequency: ~0.01 Hz spacing
Spectral Wave Frequency Range: 0.05 Hz - 0.25 Hz (20 s to 4 s
periods)
Minimum Detectable Significant Waveheight: 1 m
Data Temporal Interval: User selectable. Typical
wave averaging performed over one hour
Wave History Displays: hourly waveheight vs.
time. Hourly wave direction
vs. time. Hourly wave period vs. time
(Note: Wave information is limited by environmental conditions
and
operating frequency).
Diagnostics
ASCII or image of diagnostic time series data for system
hardware, software and data performance parameters. ASCII files
are formatted
to
CODAR's columnar table format (MatLab® loadable).
|
SeaSonde Radial Software
Functions:
•
Real-time autonomous operation
•
Real-time system monitoring, logging
(via email)
•
Hardware
•
Temperatures
•
Voltages
•
Data Acquisition
•
Miscellaneous Hardware
•
Software
•
Applications/Tools running not)
•
Data collection & processing
•
Acquisition and archiving
•
Configuration done via Graphical User
•
Layered configurable properties for both
and advanced functions
•
Graphical or command line control and
monitoring
•
Visualization Software for all stages
binary I & Q to vector maps) and diagnostics
•
JPEG or PNG plot images for sharing
or web publishing
•
Data archiving utility
•
External Antenna Response Calibration
Implementation
•
Multiple levels of configurable Quality
•
Signal-To-Noise Computation & Thresholding
•
Peak Identification & Characterization
•
Ship Echo Removal
•
Burst Interference Removal (Lightning
Others)
•
Ionospheric Noise Removal
•
Outlier Detection & Removal |
2009 SeaSonde Remote Unit Configuration Options
 |
SSRS-100 specification, v4, rev 03/2010 |
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