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ＧＰＳ和ＧＬＯＮＡＳＳ兼容性研究进展蒋志凯（大连水产学院．１１６０２４）关键词卫星导航，ＧＰＳ，ＧＬＯＮＡＳＳＡＤＶＡＮＣＥＳＩＮＴＨＥＳＴＵＤＹＯＦＴＨＥＣＯＭＰＡＴＩＢＩＬＩＴＹＯＦＧＰＳＡＮＤＧＬＯＮＡＳＳ￥ＪｉａｎｇＺｈｉｋａｉ（Ｄａｌｉａｎ... 相似文献
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卫星遥感在海洋监测中的应用 总被引：1，自引：0，他引：1
卫星遥感具有覆盖面积大、快速、全天时和全天候的工作能力。通过对卫星遥感所获得的海洋水温、水深、气象因素等数据进行分析,可以用于指导渔业生产、海洋灾害预警、海洋生态污染及灾害的监测,有着广泛的应用前景。 相似文献
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海洋渔业遥感技术及其渔场渔情应用进展 总被引：5，自引：1，他引：5
遥感已成为渔情分析和预报的重要技术手段之一。文章回顾了国内外渔业遥感技术的发展,对国外遥感渔场渔情分析应用现状进行了简要的评述,并详细介绍了我国在海洋渔场环境分析和渔场预报服务方面的研究进展。对我国今后的渔业遥感应用研究提出了几点建议。 相似文献
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近年来,基于计算机技术的互联网发展迅速,促进了各个行业的安全生产、高效管理。但是,传统的互联网只局限于便于布线的陆地,对于辽阔的海洋则无能为力。随着现代通信技术的日新月异,互联网的发展将从有线到无线,互联网的使用将延伸到广阔的海洋,这样的平台将为我国海洋渔业的信息化提供有力的支持。本文从适于海洋环境的CDMA近海通信和移动卫星全球通信及二者均可接入互联网的角度,结合已有的实例,探讨不久的将来,“全国海洋渔业安全通信网”拓展海洋渔业互联网的可能性。 相似文献
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针对目前海上渔船与流放在海面的浮标远距离通讯传输时存在信息易丢失、通讯费用高以及数据显示终端不够友好等诸多问题,对卫星通讯终端(IDP)的数据结构与哈夫曼压缩算法展开研究。采用图像分级式哈夫曼编码压缩方法,利用卫星信号收发服务器提供中转,对卫星回传的40组典型数据进行编码解码试验。结果显示,通讯数据流量最高压缩比达到0.58,平均节省通讯成本40%,客户端人机界面友好,实现卫星定位与浮标各项参数的实时显示,控制命令延迟时间仅为5 s。最终将压缩算法部署在卫星通讯终端并实时接收远程数据后,控制命令收发数据包完整、无丢帧,声呐探测图像清晰可辨,数据包压缩效果显著,达到了预期效果。此浮标已经应用至南海部分金枪鱼围网渔船,渔船可以通过船载客户端与浮标实现有效通讯并实时接收金枪鱼鱼情信息,通讯成本在可接受范围内。 相似文献
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分离式卫星标志放流技术及其在金枪鱼渔业中的应用 总被引：2，自引：0，他引：2
分离式卫星标志放流技术为近十多年来发展起来的一种标志放流方法,依赖于Argos卫星进行定位,现今已发展到了第二代。该方法具精度高、信息量大及不依赖于回收等特点。该技术有助于研究人员掌握鱼类洄游、生长、繁殖和索饵等生物与生态特征,是获得海洋生物信息的一种重要手段,并成为目前海洋渔业资源评估的有效方法之一。上世纪九十年代起,国外学者在三大洋针对金枪鱼开展了分离式卫星标志放流活动,并获得了丰富的信息,也证实了该技术的优越性。我国鱼类卫星标志技术研究起步相对较晚,对于其在渔业资源评估研究中的应用尚处于初步阶段。为此,本文主要介绍了分离式卫星标志与放流技术及其在大洋金枪鱼渔业中的应用,以期为国内研究人员开展相关研究提供参考。 相似文献
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JIANGANG LUO ERIC D. PRINCE C. PHILLIP GOODYEAR BRIAN E. LUCKHURST JOSEPH E. SERAFY 《Fisheries Oceanography》2006,15(3):208-229
A quantitative framework and numerical methodology were developed to characterize vertical habitat utilization by large pelagic animals and to estimate the probability of their capture by certain types of fishing gear. Described are the steps involved to build ‘vertical habitat envelopes’ from data recovered from an electronically tagged blue marlin (Makaira nigricans) as well as from a longline fishing gear experiment employing temperature–depth recording devices. The resulting vertical habitat envelopes, which integrate depth and temperature preferences of tagged fish, are conducive for comparative studies of animal behavior and for calculation (and visualization) of degrees of overlap – be it among individuals, species or fishing gear. Results of a computer simulation evaluation indicated our numerical procedure to be reliable for estimating vertical habitat use from data summaries. The approach appears to have utility for examining pelagic longline fishing impacts on both target and non‐target species and could point to ways of reducing bycatch via modification of fishing strategy or gear configuration. 相似文献
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TIM J. SIPPEL PETER S. DAVIE JOHN C. HOLDSWORTH BARBARA A. BLOCK 《Fisheries Oceanography》2007,16(5):459-472
Six striped marlin (Tetrapturus audax) were caught on hook and line from recreational fishing boats near northern New Zealand (34°S, 174°E) and tagged and released with pop‐off satellite archival tags. For periods ranging from 22 to 60 days over the geographical range 168°E–170°W and 13–34°S, five tags collected a total of 202 days (range of 21–60 days) of data. These data permit the investigation of striped marlin geographical and vertical movements and water temperatures occupied from February to June 2003. One hundred and one days of geoposition data showed a preliminary view of their movements in and around New Zealand waters. Transmitted temperature and depth data indicated striped marlin spent 80% (±2%) of their time in the mixed layer including 72% (±2%) of their time in the top 5 m. Temperature data indicated 75% (±10%) of the striped marlin’s time was spent in water temperatures between 20.1 and 24.0°C. Tagged striped marlin moved faster during periods of directed movement away from New Zealand versus periods of passive movements when the fish were proximal to New Zealand or not moving in any specific direction. These data support some existing hypotheses about striped marlin physiological ecology and allow preliminary suggestions about how striped marlin bycatch might be reduced. 相似文献
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Tatiana A. Acosta‐Pachn Mariana L. Muzquiz‐Villalobos Sofia Ortega‐García Raúl O. Martínez‐Rincn 《Fisheries Oceanography》2019,28(2):203-211
Striped marlin (Kajikia audax) is an epipelagic fish distributed in oceanic and coastal waters of the Pacific Ocean. This species is usually found in warm and coastal waters with high primary productivity. The main goal of this study was to describe the spatial segregation of striped marlin by average Eye‐Fork length (EFL) in the eastern Pacific Ocean (EPO) and its relationship with environmental variables using EFL data obtained from tuna purse‐seining and Generalized Additive Models (GAMs). The model suggested that larger individuals of striped marlin were more likely to be found in waters with high Chlorophyll‐a concentration (>2 mg/m3) and with temperatures lower than 25°C, within a region known as the “cold tongue” and the Humboldt current system, while smaller individuals were more likely to be found in warmer and low productive areas within a region known as the “warm pool of the EPO.” We observed that set type caused a large variation on average EFL of striped marlin; larger fish were captured in sets associated with floating objects (natural and manmade), while smaller fish were captured in sets associated with dolphins. Despite this, our findings suggest that striped marlin has a latitudinal gradient in average EFL; larger individuals occurred predominantly south of 10°N, while smaller ones occurred predominantly in coastal waters between 10°N and 20°N, thus demonstrating a spatial segregation of the species affected by its maturity stage. 相似文献
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渔场海温速报是开展渔情分析和确定中心渔场的基础，卫星遥感技术可以快速提供大面积海洋环境参数分布图，由于大洋渔场超出了陆基卫星地面站的接收范围，发展船载遥感系统是提供远洋渔场海洋环境条件的有效途径。本研究介绍基于船载的北太平洋渔场海温速报系统、海表温度遥感反演算法和渔场海温速报产品制作等内容。海温精度分析结果表明，卫星遥感海表温度与船测温度具有良好的一致性，周平均偏差小于0．01℃，RMS平均值为0．7967℃。系统已业务试运行2年，完成北太平洋渔场海温速报产品制作33期，取得了预期目标。 相似文献
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卫星测高数据在渔情分析中的应用探索 总被引：15，自引：0，他引：15
通过对卫星测高数据的分析，结合日本和美国在海面高度与渔场关系方面的研究，根据海洋学和渔业资源学的理论进行分析和探讨，为卫星测高数据在渔情分析中的应用提供了理论依据、研究思路和基本方法。卫星测高数据与常规海洋外界环境因子有非常密切的关系，经过严格的数据质量控制后，可以应用到渔场探测和渔业资源评估中。测高数据的具体可以采用直接与间接两种方式：直接方式，即作为统计相关的参数，等同于温度、盐度、水色等；间接方式，即作为数理模型的输入或者控制参数。此外，利用卫星测高数据对渔业资源进行中长期评估也具有很好的研究前景。 相似文献
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Reproductive biology and seasonal distribution of the swordtip squid (Photololigo edulis) in the northeastern waters of Taiwan were studied, based on the samples and fishery data collected from the torch-light fishery between 2003 and 2005. The swordtip squid only occurred in the Kuroshio Current and reached the coastal waters of Taiwan in January and February. From March to June, its distributional range extended to 27°N and 124°E as the front (the Kuroshio Current met the Mainland China Coastal Current) moved northward. The squid moved southwestward as the front retreated to 25°N and 123°E from July to September. After October, it was mainly distributed in the front area which shifted southwestward at this time.
Both percentage of mature individuals and gonado-somatic index (GSI) of the swordtip squid were high in spring and autumn and low in summer, indicating two spawning seasons per year. Comparison of mantle length (ML), body weight (BW) and gonad weight (GW) of mature specimens in spring and autumn indicated that individuals of autumn spawning group were larger and heavier than those of the spring spawning group. The GSI between the two spawning groups was not different in females but different in males. High GSI and high percentage of mature (stage IV) individuals in the area suggest that the inshore water off northern Taiwan between 25.5°N and 26.5°N, 121.5°E and 122.5°E could be a spawning ground for the swordtip squid. 相似文献
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寻找中心渔场是渔业捕捞生产中备受关注的问题,北斗海洋浮标可为渔场快速搜寻提供有效支持。本研究基于北斗卫星短消息通信,用面向对象的方法设计终端软件,实现海洋浮标数据的接收与控制,利用传感器数据分解包为多帧方式解决北斗短消息数据量受限问题。终端软件通过哈希表管理接收数据,用队列管理回发的信息和命令,采用多线程管理多个浮标。浮标数据接收与控制终端软件经过5组数据收发测试,单帧数据收发成功率94.6%,多帧数据收发成功率90.5%,74条控制命令发送全部成功。浮标具有小型化、成本低、长期不间断运行等特点,可应用于渔业资源探测、海洋环境监测等数据采集服务。 相似文献
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Bigeye tuna (Thunnus obesus) vertical movements in the Azores Islands determined with pop-up satellite archival tags 总被引：2，自引：0，他引：2
H. ARRIZABALAGA J. G. PEREIRA F. ROYER B. GALUARDI N. GOÑI I. ARTETXE I. ARREGI M. LUTCAVAGE 《Fisheries Oceanography》2008,17(2):74-83
Movement patterns of 17 bigeye tuna (Thunnus obesus) near the Azores Islands were analyzed between April and May 2001 and 2002 using pop‐up satellite archival tags. Despite short attachment durations (1 to 21 days, 8.2 days on average), their vertical movements revealed much shallower distribution of bigeye tuna in comparison with previous studies in the tropical Pacific and tropical Atlantic. Depth and temperature histograms were unimodal, although overall depth distribution during the day was deeper than during the night due to daily incursions in deeper waters. Although generalized additive models showed significant non‐linear relationships with weight of the fish and sea level anomaly (as a proxy for variability of thermocline depth), the effect of these variables on bigeye depth appeared minor, suggesting that vertical movements of bigeye in the Azores during the spring migration may be influenced by food availability in upper water layers. 相似文献
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Marappan Jayanthi Peter Nila Rekha Natarajan Kavitha & Pitchaiyappan Ravichandran 《Aquaculture Research》2006,37(16):1617-1626
Aquaculture is one of the fastest growing food industries and the rapid growth of aquaculture worldwide has resulted in growing concerns about its impact on important ecosystems. Kolleru Lake, India's largest fresh water body, and Ramsar site have undergone tremendous changes due to the development of aquaculture. To assess the impact of aquaculture on Kolleru, satellite data were found appropriate because of the synoptic‐detailed overview and accuracy. Satellite data of IRS 1D, LISS III from 2004 and Survey of India topographic maps from 1967 were processed using image processing techniques in erdas imagine and analysed in Geographical Information System (GIS) such as arc gis 9.1. Land use map prepared from the satellite data was verified in the field using Global Positioning System to check the land and water use classes and its areal extent. It was estimated from the topographic maps of 1967 that the total lake boundary area was 180.38 km2, in which 70.70 km2 had water throughout the year and 100.97 km2 had water during the rainy season. The digital image processing of 2004 satellite data revealed that Kolleru was no longer a lake and the lake area of 62.65 km2 (34.73%) only remained in a degraded state, extensively colonized by macrophytes. The total loss of lake area was 109.02 km2 between 1967 and 2004, in which aquaculture was developed in 99.74 km2, which represented 55.3% of the 1967 lake area. The maximum conversion to aquaculture occurred from the lake liable to be inundated during the 1967 rainy season. The area under agriculture was 16.62 km2 in 2004, the increase in lake area for agriculture between 1967 and 2004 being 8.22 km2 (4.55% of lake). If human induced degradation is allowed to continue, the lake will very soon disappear. Now, the Government of Andhra Pradesh, India, has initiated schemes and laws to restore the lake to its pre‐development state. Lessons learnt from the Kolleru Lake cautioned that there is a need for regular monitoring of important water resources throughout the world to protect the biodiversity of the earth. 相似文献