METHOD FOR INCOHERENT ACCUMULATION OF PULSED LIGHT-LOCATION SIGNALS Russian patent published in 2023 - IPC G01C3/08 G01S17/02 

FIELD: optical signals reception.

SUBSTANCE: invention relates to the reception of optical signals, in particular to the technique of receiving signals by means of avalanche photodiodes. The substance of the claimed method for incoherent accumulation of pulsed light-location signals is as follows. In each K-th probing cycle, the reflected signal is received in N range channels, in which the received signal is compared with one or more analog threshold levels, and the sum of excesses of these levels is accumulated, taking into account the level weighting factor. The presence of a signal in a particular channel is detected by comparing the sum of excesses with a threshold number. Then, reflected signals are received by means of an avalanche photodiode, in the preparatory mode, in the absence of probing laser pulses, the optimal avalanche multiplication factor M_opt of the photodiode is set for the operating mode, at which the signal-to-noise ratio is maximum. Next, in the M_opt mode, the presence of microplasma pulses is detected and the minimum amplitude of microplasma pulses U_Mmin is determined, an additional threshold level U_M is set, after which they switch to the signal accumulation operating mode, in which weighted sums Σ_j of operating threshold excesses are accumulated in each j-th range channel. In this case, in parallel, in each j-th range channel, the sums Σ_Mj of exceeding the U_M level are accumulated. At the end of a series of probing cycles in each range channel, the difference values ΔΣ_j=Σ_j-E_Mj are calculated. In the event that ΔΣ_j exceeds the set threshold number, then a decision is made about the presence of a signal in a given range channel and the distance to the target is judged by the number of this range channel.

EFFECT: ensuring the maximum probability of detecting light-location signals by the accumulation method, regardless of the microplasmas arising during the avalanche multiplication of the signal in the photodiode.

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