RU2008142602A - METHOD FOR DETERMINING THE COURSE ANGLE ON THE SOURCE OF RADIATION FROM A MOBILE UNDERWATER OBJECT AND A DEVICE FOR ITS IMPLEMENTATION - Google Patents

Abstract

 1. The method of determining the heading angle to a radiation source from a moving underwater object, which consists in generating and emitting a harmonic signal source with a frequency ω, receiving an acoustic signal with a set of N≥8 hydrophones forming a horizontal measuring base oriented in a horizontal plane, and highlighting the quadrature components of the complex envelope received acoustic signals, phase measurement of acoustic signals, preliminary phasing of the measuring base into N directions passing through its center and each of N hydrophones, determining the direction corresponding to the maximum of the signal and the hydrophone lying in this direction, calculating the bearing to the source in the local coordinate system associated with the measuring base, according to the formula:! ! where! - the angular coordinate of the nth base hydrophone, n = 1, 2, ... N; N is the number of base hydrophones, ψn is the cumulative phase at the nth hydrophone, relative to the phase at the first hydrophone, relative to which the angles φn are measured, θ0 is calculated by the formula: ψn = (ψn-ψn-1) + (ψn-1-ψn -2) + ... (ψ2-ψ1)! ! σθ is the error in determining the bearing, σψ is the error in measuring the phase, and the first hydrophone is considered to be lying on the direction of the signal maximum, characterized in that they install an additional pair of hydrophones on the moving underwater object, separated by a distance in the diametrical plane along the moving underwater object (λ is the wavelength acoustic radiation), after calculating the bearing, the course angle to the source β0 is calculated by the formula:! β0 = β1 ± θ0, σβ0 = σθ,! where β1 is the heading angle of the first hydrophone of the circular measuring base, the sign (+) is taken for the heading angle of the right b

Claims (2)

1. The method of determining the heading angle to a radiation source from a moving underwater object, which consists in generating and emitting a harmonic signal source with a frequency ω, receiving an acoustic signal with a set of N≥8 hydrophones forming a horizontal measuring base oriented in a horizontal plane, and highlighting the quadrature components of the complex envelope received acoustic signals, phase measurement of acoustic signals, preliminary phasing of the measuring base into N directions passing through its center and each of N hydrophones, determining the direction corresponding to the maximum of the signal and the hydrophone lying in this direction, calculating the bearing to the source in the local coordinate system associated with the measuring base, according to the formula:

Where

- the angular coordinate of the nth base hydrophone, n = 1, 2, ... N; N is the number of base hydrophones, ψ _n is the cumulative phase at the nth hydrophone, relative to the phase at the first hydrophone, relative to which the angles φ _{n are} measured, θ ₀ is calculated by the formula: ψ _n = (ψ _n -ψ _n-1 ) + (ψ _n-1 -ψ _n-2 ) + ... (ψ ₂ -ψ ₁ )

σ _θ is the error in determining the bearing, σ _ψ is the error in measuring the phase, and the first hydrophone is considered to be lying in the direction of the signal maximum, characterized in that they install an additional pair of hydrophones on the moving underwater object, separated in the diametrical plane along the moving underwater object by a distance

(λ is the wavelength of acoustic radiation), after calculating the bearing, the course angle to the source β _{0 is} calculated by the formula: β ₀ = β ₁ ± θ ₀ , σ _β0 = σ _θ , where β ₁ is the heading angle of the first hydrophone of the circular measuring base, the sign (+) is taken for the heading angle of the starboard side, the sign (-) is taken for the heading angle of the left side, σ _β0 is the error in determining the heading angle, and then the radiation path is synthesized by a moving underwater object on which the condition β ₀ = 180 ° + σ _θ is satisfied, then the traverse path, on which the condition β ₀ = ± 90 ° + σ _θ is met, is synthesized by the uniform rectilinear movement of the moving underwater object, measured on the traverse path at time t _m , m = 1 ÷ M, p connectivity F _m acoustic signal phases received additional pair of hydrophones approximate measured acoustic signal phase difference value F _m (t _m) on traverznoy trajectory linear relation F = a (tt ₀₎ is determined by least-squares parameters a, t ₀ by the formulas:

and determine the true heading angle to the source at the point t = t ₀ by the formula

2. A device for determining the heading angle to a radiation source from a moving underwater object, containing a circularly oriented horizontal base of N≥8 receiving hydrophones, an N-channel receiver, the inputs of which are connected to the outputs of N base hydrophones, an N-channel quadrature component extraction unit the complex envelope of the received signals, N inputs of which are connected to the outputs of the N-channel receiver, a frequency reference signal generator ω, the output of which is connected to the second N-inputs of the quadrature selection block leaving a complex envelope of received signals, an N-channel phase meter of received signals, 2N inputs of which are connected to 2N outputs of a quadrature component block of the complex envelope of received signals, a phasing block of received signals in N-directions passing through the center of the base and each of N hydrophones, 2N the inputs of which are connected to 2N outputs of the quadrature component extraction unit of the complex envelope of the received signals, the maximum value selection unit, the input of which is connected to the N outputs of the phasiro block received signals and a bearing calculator, the first N inputs of which are connected to the N outputs of the phase meter of the received signals, and the second input is connected to the output of the maximum value selection unit, the distance between the hydrophones of the circular measuring base being more than half the wavelength and less than the wavelength of acoustic radiation at the working frequency ω, characterized in that a ray path trajectory synthesis unit is introduced into it, the input of which is connected to the first output of the bearing calculator, a traverse path synthesis block, the first od connected to the second output of the calculator bearing, and the second input coupled to an output of the synthesizing ray path, two additional hydrophones spaced along a diametral plane of the movable object at a distance underwater l≤λ / 4σ _θ, (λ - length of acoustic radiation at the operating wavelength frequency ω), a 2-channel receiver, the inputs of which are connected to the outputs of two additional hydrophones, a 2-channel block allocating quadrature components of the complex envelope of the received signals, the inputs of which are connected to the dams of a 2-channel receiver, a second phase meter, the first input of which is connected to the output of the 2-channel quadrature component extraction unit of the complex envelope of the received signals, a timer whose input is connected to the output of the traverse path synthesis block, and the first output is connected to the second input of the phase meter, heading angle calculator, the first input of which is connected to the output of the second phase meter, and the second input is connected to the second output of the timer.