在海洋捕捞方面,自从采用了鱼群探测仪(以下简称鱼探仪)来寻找鱼群、确定下网地点之后,对增加鱼获量及节省劳动力虽然起着极其重要的作用,但在中上层拖网作业中,当发现鱼群时,往往由于网在水下的深度调整不当,不能把鱼群拖入网内.以前曾采用过侧量拖网曳纲离水面时的斜度来计算网的深度,但由于曳纲在水下的弯曲,结果很不准确.此外,也有把另一艘装置垂直辐射式鱼探仪的渔船,小心地驶在拖网的水面上来测量拖网深度的,但操作不便,成本亦大.于是就有了拖网深度遥测仪的试制.最初人们把一个 In the area of ​​marine fishing, since the introduction of fish finders (hereinafter referred to as fish finders) to find fish schools and to determine the location of the sites, it has played an extremely important role in increasing fish catch and saving labor. However, Trawling operations, when found fish, often due to the depth of the network in the water under improper adjustment, the fish can not be dragged into the network.Traditionally, trailers have been used side of the trawler to calculate the depth of the grid when the water from the surface of the slope, However, due to the underwater platform bending, the result was very inaccurate, and another fishing vessel with a vertical radiation finder was carefully driven to measure the depth of the trawl, but the operation was inconvenient and the cost Is also large, so there is a trial of telemetry depth trawl. Initially people put one