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Phase ambiguity solution method based on transmit signal design and processing in adcp

A technology of phase ambiguity and signal transmission, which is applied in the direction of measuring devices, instruments, fluid velocity measurement, etc., can solve problems such as phase ambiguity, achieve the effect of solving phase ambiguity problems and increasing the maximum measurable flow velocity

Active Publication Date: 2018-04-27
NANJING SHIHAI ACOUSTIC TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, the wideband coded Doppler flow measurement technology proposed later also has a phase ambiguity phenomenon that needs to be resolved

Method used

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  • Phase ambiguity solution method based on transmit signal design and processing in adcp
  • Phase ambiguity solution method based on transmit signal design and processing in adcp
  • Phase ambiguity solution method based on transmit signal design and processing in adcp

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Embodiment Construction

[0014] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0015] Such as figure 1 As shown, a measurement period is 3 pulses, the pulse width of the transmitted signal is T, and the delay between pulse 1 and pulse 2 is n 1 T, the delay between pulse 2 and pulse 3 is n 2 T, use the complex autocorrelation algorithm to process the echo signals of pulse 1 and pulse 2 and the echo signals of pulse 2 and pulse 3 respectively, and obtain two Doppler frequencies f d1 and f d2 , and then search for m 1 and m 2 make At this time f d is the correct Doppler...

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Abstract

The invention discloses an ADCP (acoustic Doppler current profiler) phase ambiguity solving method based on emission signal designing and processing. The method is characterized in that based on different emission signal delays, the problem of phase ambiguity in the Doppler coherent current survey is mainly solved, during current speed measurement by coherent current measuring, pulse delays are changed, to be specific, a delay t1 between a pulse 1 and a pulse 2 and a delay t2 between the pulse 2 and a pulse 3 are made different, if a difference between two Doppler frequency shifts is high, phase ambiguity is confirmed, the Doppler frequency shifts are then corrected by frequency searching, and an accurate radial flow speed is acquired. By the use of the method, the problem of phase ambiguity is solved, and maximum measurable current speed obtained by coherent current measuring and broadband current measuring is increased.

Description

technical field [0001] The invention relates to a method for solving phase ambiguity in a coherent flow measurement mode of an acoustic Doppler velocity profiler (ADCP), and belongs to the technical field of underwater acoustic signal measurement. Background technique [0002] Acoustic Doppler Velocity Profiler (ADCP) is a speed measurement sonar that works according to the principle of underwater acoustic Doppler, and is mainly used for remote measurement of ocean current velocity in a large range. Experiments have proved that there are a large number of scatterers in seawater, such as tiny particles, plankton, and air bubbles, which flow with seawater. These scatterers are integrated with the sea water, and their speed represents the speed of the sea current. Under this premise, ADCP, as an active sonar, emits sound waves into seawater, and the sound waves are scattered by the above-mentioned scattering body, and then ADCP receives and processes the echo signals. Accordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P5/24G01S7/486
Inventor 方世良范铮华韩宁
Owner NANJING SHIHAI ACOUSTIC TECH CO LTD