RU2015130379A - METHOD FOR CALIBRATING A PARAMETRIC TRACT AND DEVICE FOR ITS IMPLEMENTATION - Google Patents

Claims (2)

1. The method of calibrating the parametric path, in which: calibrate the parametric path of the sonar in a given area of the water area, place a reference reflective object at a known distance from the sonar antennas, use two pump signals for a radiation - a tone signal with a carrier frequency of ω ₂ and a frequency-modulated signal with a carrier frequency ω ₁ and a frequency deviation Δω, within the passband of the emitting high-frequency sonar antenna, they emit signals at frequencies ω ₁ and ω ₂ in the direction of the reference signal pressing object, receive echo signals at the differential frequency

using a low-frequency receiving antenna, they perform band-pass filtering of the received echo signals, evaluate the backscattering coefficient from the reference reflective object in the reception frequency band, characterized in that N sounding cycles are performed, for calibration in each sounding cycle, set the pump signal parameters for radiation in the direction of the reference reflective object - the carrier frequency ω ₁ (n) and the frequency deviation Δω (n) of the frequency-modulated signal and the carrier frequency ω ₂ (n) of the tone signal,

, calculate the coefficients of the matched filter based on the parameters of the emitted pump signals; estimate the maximum value of A (n) and the width ΔB (n) at a level of 0.5 of the value A (n) of the response of the matched filter to the echo signal from the reference reflective object, after performing N sounding cycles, the threshold processing of the obtained values ΔB (n) ≤ΔB ₀ , among the values ΔB lower than the threshold ΔB ₀ , the value with the largest parameter A is selected and the probe cycle number n ₀ corresponding to the selected value is stored, the optimal parameters of the pump signals ω ₁ (n ₀ ), ω ₂ (n ₀ ), Δω ( n _0), providing minimum amplitude-frequency IC CONTROL signal at the output of the matched filter, calculate the coefficients of the impulse response of the matched filter for optimal pump signal parameters and storing them at work parametric tract sonar radiation using pump signals with optimal parameters ω ₁ (n _0), ω ₂ (n _0), Δω (n ₀ ), to perform consistent processing of the received echo signals, the impulse response coefficients of the matched filter are used for the optimal parameters of the pump signals. 2. Device for calibrating the parametric path, containing a reference reflective object, a high-frequency emitting antenna and a low-frequency receiving antenna, a transmitting unit, a receiving unit, a digital signal processing unit, a control unit, while the reference reflective object is not connected, the input of the high-frequency radiating antenna is connected to the output of the transmitting unit, the output of the low-frequency receiving antenna is connected to the input of the receiving unit, the output of which is connected to the input of the digital processing unit of the echo signals, the output of which ohm is connected to the input of the control unit, the output of the control unit is connected to the input of the receiving unit and the transmitting unit, the digital processing unit, characterized in that the transmitting device uses two controlled oscillators to generate pump signals, the digital signal processing unit uses a controlled coordinated filter, in addition a calibration unit is introduced, the input of the calibration unit being connected to the output of the digital signal processing unit, the output of the calibration unit being connected to the input of the control unit.