MILCOM 2002. Proceedings最新文献_第7页

Distributed jammer performance in Rayleigh fading 瑞利衰落中的分布式干扰器性能

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180525

B. McGuffin

{"title":"Distributed jammer performance in Rayleigh fading","authors":"B. McGuffin","doi":"10.1109/MILCOM.2002.1180525","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180525","url":null,"abstract":"A distributed jammer is a set of small jamming transmitters distributed over a region to disrupt tactical communications. Propagation losses experienced by terrestrial jammers will be comparable to losses seen by the target radio links, with multipath fading, and power failing off faster than 1/r/sup 2/. An intelligent distributed jammer can partly overcome excess propagation loss by exploiting the proximity and small number of targets in each node's coverage region to extract information needed for frequency following or synchronized pulsed jamming. The coverage radius of an individual jammer node is an important system parameter, determining the number of nodes required. and the resulting jammer cost. A set of equations are presented that give the probability of jamming a target receiver randomly located inside a fixed range, when both communications and jamming signals suffer from Rayleigh fading. and average jammer power falls off faster than line-of-sight power. An upper bound on jammer performance improvement with intelligent jamming is found by assuming the nodes are able to extract desired target signal information. and calculating the improvement in jammer reliability with a fixed coverage range. Both frequency followers and synchronized pulsed jammers are examined. Performance improvement is greatest when each node's coverage region contains a limited number of distinct communications sub-networks.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115795014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Therminator 2: a thermodynamics-based method for real-time patternless intrusion detection Therminator 2:基于热力学的实时无模式入侵检测方法

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179705

S. D. Donald, R. V. McMillen, D. Ford, John C. McEachen

引用次数: 15

Communication architecture and protocols for broadcast-type mobile multimedia ad hoc networks 广播型移动多媒体自组网的通信体系结构和协议

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180483

Hoon Oh, H. Park

引用次数: 2

Communications network architectures for the army future combat system and objective force 面向陆军未来作战系统和目标部队的通信网络体系结构

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179690

J. Hillman, S.D. Jones, R. Nichols, I. Wang

{"title":"Communications network architectures for the army future combat system and objective force","authors":"J. Hillman, S.D. Jones, R. Nichols, I. Wang","doi":"10.1109/MILCOM.2002.1179690","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1179690","url":null,"abstract":"A key element of the USA army's transformation is the future combat system and objective force (FCS/OF). The FCS/OF will operate as a cohesive, mobile, lethal, survivable, and sustainable land combat force capable of rapid deployment and immediate employment upon arrival and able to defeat threats in the 2010-2025 timeframe. This is to be achieved through network-centric operations wherein the force is realized through the network. In this paper we consider three echelons of the objective force, the FCS at the lowest level, above which resides the unit of action and the unit of employment. A communications network architecture study has been conducted to determine how the mobile nodes of the FCS/OF network may be best configured to realize this force. The study has examined a number of potential architectural topologies and the performance that can be expected from each. Trade studies were conducted to assess the relative merit of various technologies to the FCS/OF network on the basis of measures of performance such as capacity, connectivity, coverage, protection, and scalability. The result is a recommended communications architecture that will most readily achieve the goals of the FCS/OF. A flat architecture at the lowest echelons exploits mobile ad hoc networking with directional antennas for terrestrial communications. Range extension is realized through relays of various forms including unmanned aerial vehicle and satellite communications. Unit of action communications are organized into subnetworks with relay to lower and higher echelons, as well as joint and coalition forces. The unit of employment network enables command and control on-the-move and reachback to continental USA and external forces.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122984652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Performance of efficient tactical UHF-satcom waveforms: occupied bandwidth, coding gain, spectral efficiency, bit error rate, and adjacent channel interference 高效战术超高频卫星通信波形的性能:占用带宽、编码增益、频谱效率、误码率和相邻信道干扰

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180431

M. Nezami, Bror Peterson, Raytheon

引用次数: 5

Improving the QoS of Bluetooth through turbo coding 通过turbo编码提高蓝牙服务质量

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179623

M. Valenti, Max Robert

引用次数: 17

Image compression and transmission for HF radio systems 高频无线电系统的图像压缩和传输

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179663

M. Kurdziel, W. Furman

{"title":"Image compression and transmission for HF radio systems","authors":"M. Kurdziel, W. Furman","doi":"10.1109/MILCOM.2002.1179663","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1179663","url":null,"abstract":"This paper presents a novel image compression technique coupled with three HF transmission schemes. The image compression scheme is based on a phase dispersion technique originally developed for the design of pulse compression radar waveforms. The technique forms the basis for a lossless, invertible transform that converts sub-band coefficients to an intermediate domain. This image compression scheme generates significance map bits, which must be transferred across the HF link error free (hard bits) as well as magnitude vectors, which can sustain some degree of received errors (soft bits). The paper gives a brief overview of the image compression scheme followed by a discussion of three transmission schemes. The first transmission scheme investigated is the forward transmission HF modem. In this technique an HF modem is utilized set at an appropriate on-air data rate for the current HF channel conditions. This is a one way broadcast technique with no feedback from the destination. The second transmission scheme investigated is an automatic repeat request (ARQ) technique. This technique utilizes requests from the destination to resend data packets received in error and guarantees error free transmission of the image data. The third transmission scheme examined is a hybrid scheme, which couples an ARQ technique for the error free delivery of the hard bits with a forward transmission HF modem to provide good protection for the soft bits.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129806783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Study of alternative approaches to non-coherent detection of FQPSK and other quadrature modulated systems FQPSK和其他正交调制系统非相干检测的替代方法研究

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180527

J. McCorduck, K. Feher

{"title":"Study of alternative approaches to non-coherent detection of FQPSK and other quadrature modulated systems","authors":"J. McCorduck, K. Feher","doi":"10.1109/MILCOM.2002.1180527","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180527","url":null,"abstract":"For telemetry applications requiring high spectral efficiency, robust performance and fast synchronization in a frequency selective environment, various non-coherent demodulator architectures are proposed, presented, and compared. Previously studied methods including differential detection, limiter discriminator (LD) with maximum likelihood sequence detection (MLSD), and LD with multiple symbol correlation incorporating Viterbi algorithm (VA) based receivers are reviewed. These previously studied methods offer performance within approximately 3 dB of the coherent detection of US DoD-RCC-IRIG 106/00 and international CCSDS standardized Feher (see US Patents: 4,567,602; 4,644,565; 5,491,457; 5,784,402; 6,198,777, International Patent Cooperation Treaty (PCT) No: PCT US99/17995; International Patent No. WO 00/10272, February 2000) quadrature phase shift keying (FQPSK). virtual diversity, comparator-counter, and other architectures are introduced as other alternatives for robust operation and fast synchronization in a frequency selective environment. Virtual diversity employs several \"free-running\" and offset carriers placed in distinct receiver paths. Each signal is evaluated in its BER performance with selection of the path with the best performance. This architecture has the potential of better BER performance for high bit rate applications. The comparator-counter method utilizes a comparator to detect zero crossings and counters placed in quadrature paths to detect the number of zero crossings. The information obtained from these counters is then evaluated to determine the transmitted bit. This method potentially offers simplicity with a relative ease of implementation. Areas for comparison of all of the above mentioned methods include overall BER performance, simplicity with ease of implementation, and robust operation.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129356936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Joint Tactical Radio and the Navy RF distribution system challenge 联合战术无线电和海军射频分配系统挑战

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1180468

R. Adams, K. Moeller, J. Rockway

{"title":"The Joint Tactical Radio and the Navy RF distribution system challenge","authors":"R. Adams, K. Moeller, J. Rockway","doi":"10.1109/MILCOM.2002.1180468","DOIUrl":"https://doi.org/10.1109/MILCOM.2002.1180468","url":null,"abstract":"In an effort to increase communications capability while decreasing life-cycle costs, the US Navy has recently begun procurement of the Digital Modular Radio (DMR), one of the first communications systems to address the requirements under the Joint Tactical Radio System (JTRS). Radios procured in the future must conform to the requirements under the JTRS. These requirements include open architecture, software programmability, use of commercial-off-the-shelf technology, and the ability to transmit or receive at any frequency between 2 MHz and 2.5 GHz. Line of sight communications such as ship-to-ship, ship-to-plane, or ship-to-shore, usually occur in the 30 to 400 MHz frequency range. The wide scale deployment of a JTRS compliant radio is one factor in the need for an advanced RF distribution system. Reducing the number of antennas while increasing communications capabilities presents significant new challenges in the area of electromagnetic interference (EMI). The requirement to reduce EMI is probably the most significant factor in the need for an advanced RF distribution system. One approach to reducing the EMI is an interference mitigation system that taps off some of the transmitted signal, changes its phase by a known amount, and adds it to that at the receive antenna. An advanced RF distribution system is needed to accommodate JTRS compliant systems on US Navy ships. At a minimum the distribution system should accommodate the spectrum of line of sight communications for the JTRS. This is a significant challenge in the area of communications for the US Navy, in the twenty-first century.","PeriodicalId":191931,"journal":{"name":"MILCOM 2002. Proceedings","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121919614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Performance comparison between FH-FDMA and FHMA systems under the worst case band multitone jamming FH-FDMA和FHMA系统在最坏情况下多频干扰的性能比较

MILCOM 2002. Proceedings Pub Date : 2002-10-07 DOI: 10.1109/MILCOM.2002.1179568

Y. Yoon, Seokjoo Shin, Sungdon Moon, Kiseon Kim

引用次数: 0