The research of temperature instability influence of optic communication line on the phase difference a deep-sea direction finder

Abstract

The article of the methods for coordinates determination of the object coordinates are reviewed. The advantages of a passive method with the using of the direction finder are noted. The problems arising from the transmission of signals in the direction finder method are determined. The construction for the signal transmission of the fiber optic communication line is presented. It is established that the greatest influence on the error in determining the coordinates of the object by direction finder has a phase shift in the optical fiber during a change the temperature. The chart of the phase shift at the temperature for various cases of optical fiber placement are investigated. The obtained data of the experimental investigations are presented.

Study of the impact of recultivated granite stone quarry dumps on the environment and agricultural land in the Leningrad region

“…Currently, the technogenic human impact on the environment is growing [1][2][3][4][5][6][7][8][9][10]. Various reasons contribute to this [10][11][12][13][14][15][16][17][18][19]. One of them is the sharp increase in industry and population [7,12,13,16,[20][21][22][23][24][25][26].…”

Monitoring of soil pollution caused by industrial enterprises in one of the districts of St. Petersburg

“…Negative processes affect various components of the environment (air, water, green spaces and soils) [2,3,6,[8][9][10][11][12][13][14][15]. The sharp reduction of forests and green areas has led to a decrease in the ability to process emissions of carbon dioxide and other harmful substances [1,3,8,9,[16][17][18][19]. The development of large cities with extensive industrial areas reinforces this trend [7,17,[20][21][22][23].…”

Monitoring the water quality in our rivers in urban areas

“…Especially this impact strongly affects the nature near large cities [1,4,[9][10][11][12][13][14][15][16]. In addition to industrial enterprises, sources of pollution in these cases are power plants, motor transport, and others [11,12,15,[17][18][19][20][21][22]. A large number of emissions creates a difficult ecological situation [14,15,[18][19][20][21][22][23][24][25].…”

“…In addition to industrial enterprises, sources of pollution in these cases are power plants, motor transport, and others [11,12,15,[17][18][19][20][21][22]. A large number of emissions creates a difficult ecological situation [14,15,[18][19][20][21][22][23][24][25]. Rivers and reservoirs located in urban areas and suburbs of megacities are exposed to the strongest impact [1,4,20,[26][27][28][29][30][31].…”

“…A large number of emissions creates a difficult ecological situation [14,15,[18][19][20][21][22][23][24][25]. Rivers and reservoirs located in urban areas and suburbs of megacities are exposed to the strongest impact [1,4,20,[26][27][28][29][30][31]. Intensive agricultural activity near megacities creates additional environmental problems [32][33][34][35][36][37].…”