METHOD FOR LOCATING RANGE MEASUREMENT Russian patent published in 2022 - IPC G01C3/08 

FIELD: measuring.

SUBSTANCE: invention relates to laser location, namely, to pulsed laser range finders and locators. The method for locating range measurement by sensing the target with a test pulse of low energy E₂ and receiving the signal reflected by the target, and in the absence of a reflected signal, by re-sensing the target with a pulse of rated energy E₁, determining the range R to the target by the delay of the reflected signal T relative to the time of emission of the sensing pulse. The axes of the sensing emission beams are pre-aligned, the energy of the test pulse is set, wherein ψ₂ is the angle of divergence of the test sensing emission beam; R_ref is the range to the mirror reflector; D_ref is the effective diameter of the mirror reflector; Ε_thr1 is the sensitivity threshold of the receiving channel, the transmission coefficient of the receiving channel is preset so that the signal from the diffusely reflecting target at the minimum range, corresponding to the test pulse sensing, is within the linear range. Test sensing is then executed, in the presence of a reflected signal, the delay Τ thereof relative to the sensing pulse is determined and the range to the target is calculated by the formula R=cT/2, wherein c is the speed of light, wherein the target is considered a mirror reflector, and the measurement process is terminated, and in the absence of a reflected signal, a pulse with an energy Ε₁ is emitted, the reflected emission is received simultaneously by two receiving channels with sensitivity thresholds Ε_thr1 and Ε_thr21, wherein Ε_thr2/Ε_thr1=Q_thr=10…100, and if the reflected signal is only detected by the main receiving channel with a sensitivity Ε_thr1, then the range to the target is determined by the delay Τ of the received signal relative to the sensing pulse with an energy Ε₁, and is the signal is detected by both receiving channels, the range to the target is determined by the delay of the signal received by the channel with a lower sensitivity, relative to the sensing pulse with an energy E₂, wherein Q_em·Q_thr≥Q, wherein ; ψ₁ and ψ₂ are the angular divergence of the main and additional emission beams; Ε₁ and E₂ are the energy of the corresponding sensing pulses; Q is the value of the dynamic range of the reflected signals.

EFFECT: ensured safe mode of operation of the photodetector and extreme precision in a wide scope of ranges while maintaining the structural characteristics of the small-sized range finder.

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