Technology

Technology is our business. Since the formation of Miros in 1984, the foundation of the company has been the passion to build world class remote sensors for measuring the ocean surface. We build remote sensors for sea state measurements, keeping our hardware out of water and measurements free from structural disturbances.


Microwave Doppler Radar; Miros SM-050 Wave and Current Radar

 

Unique concept: The SM-050 Wave and Current radar is a unique high performance remote sensor for measurement of directional wave spectra and surface current. It is the only sensor in the world utilizing dual footprint pulse Doppler method for wave measurements, and microwave dual frequency method for measuring surface current. The SM-050 is based on proven technology, originally developed in the early 1980’s. It has been thoroughly tested and kept continuously updated to meet latest requirements.

Verified accuracy and high reliability: The accuracy of the sensor has been verified in a number of independent comparisons. The data quality is at the same level as high performance buoys, but with higher availability.

Principles of operation: The radar observes the ocean surface in a semi-circle at a distance of 180-450 m depending on the installation height, typically 25 – 80 meters. The selected frequency of operations ensures a very high degree of penetration through precipitation and sea spray, and provides accurate measurements in all harsh weather situations.

Publications Miros SM-050


Vertical Microwave Radar; Miros SM-140 RangeFinder

The concept: The RangeFinder is a high frequency vertical microwave radar providing sea level, tide, non-directional wave monitoring, ride control and air gap measurements. The low frequency of operation (compared to laser sensors) provides accurate measurements undisturbed by fog, rain and water spray.The sensor can also be delivered with motion compensation for wave measurements on vessels.

Verified accuracy and high reliability: The Miros RangeFinder measures with millimetre accuracy (+/- 5mm). With motion compensation (MRU), it is the only system in the world for providing wave parameter data with sufficient accuracy to meet DNV’s Offshore Standard DNV-OS-H101, Marine Operations, General.

Principles of operation: The sensor emits a microwave FM chirp signal and receives the echo from the water surface. The signal propagation delay given by the distance from the antenna to the water surface causes a beat signal in the receiver. By means of advanced signal processing the beat frequency is converted to an accurate distance. The FM chirp is generated by a digitally synthesized frequency sweep oscillator with absolute frequency linearity and high stability. The sensor therefore provides accurate range measurements and high long terms stability. Up to 50 measurements per second is averaged over a user selectable averaging time and the distance to the surface can range from 1 to 100 meters – much more than any competing product.

Publications Miros SM-140


Imaging Radar / Virtual Sensor (Wavex®)

 

The concept: Wavex® is a virtual sensor designed for wave and current measurements using data from a standard marine X-band radar. The system is operative at all ship speeds and from fixed locations.

Verified accuracy and high reliability: The accuracy of the sensor has been verified in a number of independent comparisons and Wavex® is type approved by DNV GL .

Principles of operation: The Wavex® system measures sea state from digitized sea clutter images provided by a marine X-band radar operated in short pulse mode. The radar backscatter  from the sea surface is modulated by gravity waves, giving wave-like patterns in the images. The modulation is related to three mechanisms, namely tilt modulation, hydrodynamic modulation, and shadowing. Grazing angles in the range of 1 to 10 degrees are recommended to achieve an appropriate radar image contrast Cartesian sections are extracted from the radar images for further processing and data from the Cartesian sections are combined into one directional wave spectrum. A minimum wind speed of 1 – 2 m/s must be present for Wavex® to record wave and current data. Recommended radar antenna mounting height is 15 – 100 meters above sea.

Publications Wavex®