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Multi-Return Altimeter 11001 SpecificationMost existing Altimeters operate by measuring the travel time between a transmitted acoustic pulse and the first received echo which exceeds a given signal threshold. These devices operate on what is known as a "first-return" basis. This method works satisfactorily in ideal conditions, where there is little ambient noise and the water is free from bubbles or suspended sediments, however, this is most often not the case. The Marine Electronics model 11001 Multi-Return Altimeter is a sophisticated digital sonar system whilst remaining simple to integrate with other equipment on both scientific platforms and ROV's. The Model 11001 Altimeter transmits a narrow 1.6 conical beam at 1.1MHz with a programmable pulse length from 10usec in width. A high speed A/D converter captures the received echos directly into a FIFO memory buffer with a programmable sample rate and count. The start and stop ranges for which the A/D captures data are also programmable so that a specific range may be examined in minute detail with up to 4095 samples spaced as little as 1usec apart. The model 11001 examines the data stored inthe FIFO and calculates the range to the sea-bed mathematically with a noise rejection algorithm.
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Acoustic Frequency: |
1.1MHz |
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Marine Electronics Ltd.
Underwater Acoustic Engineering.
