SonarPoint™
The SonarPoint system is the third generation of Desert Stars passive underwater acoustics monitoring toolkits. Derived from the MicroMARS, the SonarPoint is a modular recorder with localization capabilities, flexible storage capacities, long run-time, and easy to service components at an affordable price. As a continuation and improvement on MicroMars, SonarPoint incorporates  field-tested   technology with highly precise localization capabilities. A modular design also means the mission flexibility and portability of SonarPoint  is  adequate for most any mission and deployment medium.  

Record. Localize. Endure.

Record:  Hydrophone Selection

SonarPoint™ currently offers two hydrophone options (if that isn't adequate for your circumstances, please contact us) which offer recording from 2Hz - 250kHz with either an end-cap integrated or free-field configuration. 

SH33/SH125 - Endcap Integration 


This hydrophone option is screwed into one end of the SonarPoint recorder, which mean the durability of this option is highest since the chance of a snag or something hittig the hydrophone is low. The left model is the SH33 with recording from 2Hz - 33kHz. The right model is the SH125 with recording from 2Hz - 125kHz. Please note, this comfiguration offers great durability and a cost-efective approach, however, it is not recomended for missions which require extremely qiuet recordings. Due to the hollow, air-filled chamber of the SonarPoint recorder, this hydrophone configuration will result in minor sound reverberations. 

ModelSensativity Frequency Response FormPrice (USD)
SH33Full scale 130 - 240 db selectable
Noise 100 - 120 db below FS
2Hz - 33kHz End-cap Integrated 700
SH125 Full scale 130 - 240 db selectable 
Noise 100 - 120 db below FS
2Hz- 125kHz End-cap Integrated 700





HTI-99-UHF Free-field 


The HTI-99-UHF offers freuency response of 2Hz - 250kHz . This option offers the best performance with a potential for snags or getting caught due to the wired nature. The hydrophone sits several meters away from the recorder and is attached via a cable. There is no presence of sound reverberations.

Model Sensativity Frequency Response  Form Price (USD)
HTI-99-UHF Full scale 155 db re. uq Pa Noise 15 db re. 1uq Pa / √Hz 
2Hz - 250kHz Free-Field  3,000
Localize:  Acoustic Array Time Synchronization

Sound source localization arrays work by a phenomenon known as a differential time of arrival (DTOA). As a sound source propagates through the horizontal water column, it will reach each recording location at a different time (3 or more are required). Using the difference in when the sound reached each recording location, you can determine, with sub-meter (in ideal conditions) accuracy, where a sound source originated from and potential it's directional heading and speed. To ensure the time measurement among all recording stations is in-sync (to provide the best accuracy and avoid errors), SonarPoint uses several time synchronization techniques listed below. Please note, each of these techniques is optional and will be recommended depending on your unique mission/project circumstances and goals, please inquire if you have questions.  Ask a question. 

Internal GPS module each  SonarPoint™ recorders comes with an internal GPS module, which, upon the recorder being turned on, will connect and sync to exact GPS time (atomic clock). This method of initial time synchronization ensures each recorder is time synchronized to each other before deployment begins. 


Repeater Buoy  A repeater buoy offers surface expression and also has an internal GPS module. A SonarPoint™ recorder will be linked to it and subsequently periodically receive the GPS 1PPS signal (exact time) from the repeater buoy. This configuration would, therefore, require that each station (recorder) has its repeater buoy. This setup is typically recommended as the "Drifting Array," which is best used in rapid deployment situations for the short-term. Additionally, the repeater buoy will make physical tracking of the system easy via transmissions to the Argos satellite constellation or GPS location (customer may choose). 


Synchronization Pinger This module is often used for fixed arrays for medium to long-term deployments and propagates a time signal to each recorder. In post analysis, the "master time signal" is then used to sync all recording segments for the best accuracy. Often a mission/project only calls for one pinger; although greater distance or high accuracy applications may require more than one unit, please contact us more recommendations/advice. 


Master Clock System In the case of a tight array, it is possible to time synchronize each recorder through one master system. In this configuration, the "master" is the reference of time for each "slave." This avoids the need/use of a synchronization pinger. However, it does require a daisy-chained setup and fairly close recorder placement. Even with close recorder placement (centimeters), highly accurate localization may still be achieved for most any mission/project.

Endure:  Sample Battery Endurance 

 

Model Memory Max Depth Endurance 1   @100kHz (days) Endurance    @312.5kHz (days) Endurance 2     @46.7kHz (days)                               
SP300-2 Up to 2TB 300 meters 16 days 3 10 days 3 6 days 3
SP300-8 / SP1000-8 Up to 8TB Up to 1000 meters 60 days 3  /            290 days  5

41 days 3  /               30 days 4
23 days 3  /            111 days 5

1 With Lexar Pro 512GB memory cards.   2 With SanDisk Extreme PRO 512GB cards (used for > 312.5 kHz).   3 Wireless (acoustic) synchronized.   4 Wire synchronized sample clock propagation mode.   5 With SPB-350AH external battery pack in wireless synchronized mode.  Momory limited at 416.6 kHz, battery limited at 100 kHz.

GPS Models

SP300-2

Short-term 

$ 3,500

  • 300m Depth Rated 
  • 2TB Max Memory, 2 SD Cards
  • SPIB-10.4AH Internal Battery Included
  • Best for Drifter Arrays 

SP300-8

Long-term

$ 6,000

  • 300m Depth Rated
  • 8TB Max Memory, 8 SD Cards
  • SPIB-45AH Internal Battery Included
  •  Best for fixed arrays

SP1000-8

Max Depth

$7,000

  • 1000m Depth Rated
  • 8TB Max Memory, 8 SD Cards
  • SPIB-45AH Internal Battery Included
  • Deep Sea Studies 

Software

Long-term recording segments or mission/project durations incur massive amounts of data (up to 8000 GB per recorder) and therefore require specialized data extraction, processing, and analysis tools. In order to avoid time bottlenecks, SonarPoint™ utilizes software with a batch process emphasis. Using command-line tools, batch processing is possible and actually quite easy if instructions are properly followed. 

Processing Chain 

Function Name Input Output
Recorder Configuration  SP-DOCK Configuration Parameters  Recorder ready to deploy 
File Recovery SP-READ Raw data from SD cards  Single-channel .WAV
File Merge & Sync  SP-MERGE Single-channel .WAV files Time sync multi-channel .WAV
Event Detection and Timing  SP-DETECT Multi-channel .WAV files .csv with event times and hydrophone positions 
Event Localization SP-LOCALIZE .csv with event times and hydrophone positions .csv with event location and vector