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Military Communications Conference, 1991. MILCOM '91, Conference Record, Military Communications in a Changing World., IEEE

Date 4-7 Nov. 1991

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Displaying Results 1 - 25 of 245
  • Military Communications in a Changing World MILCOM, 91. Conference Record (Cat. No.91CH2981-9)

    Publication Year: 1991
    Cited by:  Patents (1)
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    Freely Available from IEEE
  • Networking for highly distributed and mobile C3I systems using short wavelength, agile-beam communications technologies

    Publication Year: 1991 , Page(s): 736 - 739 vol.2
    Request Permissions | Click to expandAbstract | PDF file iconPDF (392 KB)  

    Communications for highly distributed and mobile military command, control, communications, and intelligence (C3I) systems, such as constellations of sensor satellites or formations of aircraft, tactical vehicles, or naval vessels, pose unique challenges with regard to network management, low probability of intercept, and robustness. Short wavelength, agile-beam transmitters and spatially resolvin... View full abstract»

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  • Enhanced multinet gateway: survivable multi-level secure data communications

    Publication Year: 1991 , Page(s): 740 - 744 vol.2
    Cited by:  Patents (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (340 KB)  

    The enhanced multinet gateway (EMG) is a multilevel secure packet-based gateway that is being developed. The functions, capabilities, and security features of the EMG are described. As outlined, the EMG will provide for the secure flow of data from a single- or multilevel secure host or network to another host or network operating at an equal or higher security level. It will interface to a wide v... View full abstract»

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  • A methodology for employing modulation quality factors in the analysis of LPI waveforms

    Publication Year: 1991 , Page(s): 532 - 536 vol.2
    Request Permissions | Click to expandAbstract | PDF file iconPDF (284 KB)  

    A methodology which demonstrates the use of low probability of intercept (LPI) quality factors in assessing the detectability of a candidate LPI waveform by a variety of wideband nonlinear intercept receivers is presented. The methodology described focused on the modulation format of the LPI waveform and described the quality of its covertness in terms of a modulation quality factor. A technique f... View full abstract»

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  • Architectural considerations for the improvement of multimedia communications network performance

    Publication Year: 1991 , Page(s): 966 - 970 vol.3
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (348 KB)  

    The author discusses some of the issues associated with establishing a multimedia communications network architecture, primarily relying on the use of a multiparameter routing metric developed for use in the media resource controller program. Improvements to the previously published multi-media communications model (MMCM) are discussed and simulation performance results are presented View full abstract»

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  • INFOSEC considerations for tactical key management in the IRIS radio system

    Publication Year: 1991 , Page(s): 745 - 749 vol.2
    Request Permissions | Click to expandAbstract | PDF file iconPDF (340 KB)  

    Recent developments in electronic key management systems offer the opportunity for improved security and administrative effectiveness with lower operational cost. Key distribution is a subset of a total information management system designed to provide responsive and efficient use of communications resources. The IRIS crypto-material management system (CMMS) supports the communications management ... View full abstract»

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  • A multiprocessor architecture for high-rate communication processing

    Publication Year: 1991 , Page(s): 1001 - 1006 vol.3
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    The author presents a general-purpose multiprocessor architecture which accommodates an I/O bandwidth of many Gb/s through the use of VRAM in the main memory. The virtual port memory architecture is a global-memory-message-passing multiprocessor which is well suited to I/O-intensive real-time processing. This bus-based architecture permits incremental adjustments in I/O bandwidth, memory size, and... View full abstract»

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  • A new approach to interference suppression in spread-spectrum systems

    Publication Year: 1991 , Page(s): 375 - 379 vol.1
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (296 KB)  

    The nonlinear filter derived by H.V. Poor and R. Vijayan (1988, 1990) is generalized to the case of channels corrupted by impulsive noise. The class of impulsive channels considered includes the Gaussian channel as a special case. The authors exploit the binary nature of the direct-sequence signals to obtain performance using nonlinear filters. A nonlinear modification of the transversal filter, w... View full abstract»

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  • MUSIC algorithm implementation for shipboard HF radio direction finding

    Publication Year: 1991 , Page(s): 943 - 947 vol.3
    Cited by:  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (392 KB)  

    A high-resolution, high-frequency direction finding system for shipboard applications based on the multiple signal classification (MUSIC) algorithm has been developed. The half-rack system has successfully undergone at-sea and pier-side tests on several ship classes, and at several field sites. Using a 3- to 5-m antenna aperture, the system demonstrates groundwave line-of-bearing accuracies of &pl... View full abstract»

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  • High resolution frequency hopped DPSK in tone jamming

    Publication Year: 1991 , Page(s): 581 - 585 vol.2
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (280 KB)  

    An analysis for the bit error ratio (BER) of high resolution frequency-hopped differential phase shift keyed (DPSK) signals in multitone jamming is presented. Tones are assumed to have equal power and may be either uniformly spaced or at random frequencies. Under the constraint that the probability of two tones hitting a signal at once is small, the degradation due to this jamming scenario is show... View full abstract»

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  • The digital voice terminal for slow-FH radio application

    Publication Year: 1991 , Page(s): 1162 - 1166 vol.3
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (320 KB)  

    The authors present a real-time digital voice terminal (DVT) for slow frequency-hopping (slow-FH) radio applications to ensure a reliable radio link. Slow-FH technologies have been introduced for ECCM communications as a near-term solution which will not disturb the usage of the present conventional radio spectrum. Digital secure algorithms with digital speech codec are known to achieve a high deg... View full abstract»

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  • Ultra-low power consumption military communication systems

    Publication Year: 1991 , Page(s): 30 - 36 vol.1
    Cited by:  Patents (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (396 KB)  

    The authors present general techniques to reduce the power consumption while increasing the clock rate and maximizing the silicon area of CMOS circuits. Modern digital signal processing implementations suffer from high power dissipation while requiring large silicon area. A technique based on the use of additional transistors with a modified threshold is described. This technique lowers the power-... View full abstract»

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  • Generalized likelihood-ratio detection of multiple-hop frequency-hopping signals

    Publication Year: 1991 , Page(s): 527 - 531 vol.2
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (320 KB)  

    A noncoherent receiver that detects multiple-hop frequency-hopping (FH) signals is developed based on a generalized likelihood-ratio test (GLRT) theory. Hop rate, hop transition times and the set of candidate carrier frequencies are assumed to be known. The proposed receiver has a simple architecture and consists of a bank of envelope filters, a maximum operator, an accumulator, and a threshold de... View full abstract»

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  • Information systems security enters the 1990s

    Publication Year: 1991 , Page(s): 870 - 872 vol.2
    Request Permissions | Click to expandAbstract | PDF file iconPDF (236 KB)  

    The US government must make profound changes in the way it approaches information systems security. These changes are further prompted by: (1) rapid technological advances that have virtually eliminated the traditional distinctions between telecommunications and information systems, (2) the move toward commercial off-the-shelf acquisitions, (3) a more complex threat scenario, and (4) an increasing... View full abstract»

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  • Fiber optic Ethernet transceiver for Joint STARS block I GSM

    Publication Year: 1991 , Page(s): 1086 - 1090 vol.3
    Cited by:  Patents (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (180 KB)  

    The authors discuss the use of FiberCom's DPT dual redundant counter-rotating ring Ethernet transceiver, and its use as an integral part of the Joint STARS (Surveillance Target Attack Radar System) surface-to-air battlefield information station called the ground station module (GSM). The Ethernet transceiver uses a dual counter-rotating fiber ring architecture. The operation of the unit enables th... View full abstract»

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  • Preliminary measurements of the wideband HF groundwave channel

    Publication Year: 1991 , Page(s): 220 - 225 vol.1
    Request Permissions | Click to expandAbstract | PDF file iconPDF (376 KB)  

    An experiment was conducted to measure key parameters of the wideband groundwave propagation channel over a nominal instantaneous bandwidth, of 1 MHz. The experiment was conducted to measure the time dispersion induced by the channel, to compare the path loss for wideband signals versus narrowband signals, and to gain a better understanding of the noise and interference environment for the groundw... View full abstract»

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  • Radio frequency interference effect on PN code sequence lock detector

    Publication Year: 1991 , Page(s): 1074 - 1078 vol.3
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (348 KB)  

    The authors find the probabilities of detection and false alarm of the pseudonoise (PN) sequence code lock detector when strong radio frequency interference (RFI) hits the communications link. Both a linear model and a soft-limiter nonlinear model for a transponder receiver are considered. In addition, both continuous wave (CW) RFI and pulse RFI are analyzed, and a discussion is included of how st... View full abstract»

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  • Smart AGC: a new anti-jam device for military satellite system

    Publication Year: 1991 , Page(s): 672 - 677 vol.2
    Cited by:  Papers (7)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (388 KB)  

    An antijam device based on substitution of a more efficient automatic gain control (AGC) function into the front end of a transponder is described. Smart AGC discriminates between jammed and unjammed signals based solely on amplitude of the incoming signals. The key to operation of smart AGC is a broadband power measurement of the composite input signal which is then used to control a nonlinear am... View full abstract»

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  • Frequency independent suppression of interference signals on spread-spectrum communications

    Publication Year: 1991 , Page(s): 380 - 384 vol.1
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (320 KB)  

    A novel device, called the frequency-independent strong-signal suppressor (FISSS), is described. It is placed after the antenna and uses an amplitude-dependent voltage standing wave ratio that exhibits a very sharp transition from matched load to open load. Signals having amplitudes greater than a predetermined threshold (e.g. the interfering signals) are absorbed, while weaker signals (e.g. the s... View full abstract»

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  • Dynamically reserved slot management (DRSM) for packet radio networks

    Publication Year: 1991 , Page(s): 172 - 176 vol.1
    Cited by:  Papers (1)  |  Patents (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (400 KB)  

    Dynamically reserved slot management (DRSM) is a dynamic, distributed slot management protocol for time-division-multiple-access (TDMA)-based packet radio networks, residing at the network layer of the International Standards Organization (ISO) open systems interconnect (OSI) reference model. The authors discuss the functions and implementation of the DRSM protocol and present some simulation resu... View full abstract»

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  • Post acquisition PN code uncertainty reduction by least-squares interpolation

    Publication Year: 1991 , Page(s): 804 - 808 vol.2
    Cited by:  Patents (11)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (288 KB)  

    In direct-sequence spread-spectrum systems, typical acquisition strategies for searching the uncertainty region of the PN code operate either serially or in parallel at half-chip increments. The 2.5-dB offset loss resulting from a worse-case quarter-chip timing error has direct impact on the architectural design of both the acquisition and tracking subsystems. A computationally efficient technique... View full abstract»

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  • Hardware implementation of the advanced SCAMP downlink processor

    Publication Year: 1991 , Page(s): 1117 - 1122 vol.3
    Request Permissions | Click to expandAbstract | PDF file iconPDF (348 KB)  

    The advanced single-channel antijam man-portable (ASCAMP) downlink is a custom-designed digital signal processor implemented in hardware that runs a tailored and efficient microcode. Appropriate sections of microcode are executed in response to the downlink requirements. The different processing functions, hardware design, and hardware implementation are discussed. The author points out the unique... View full abstract»

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  • A severely punctured convolutional code-its performance and structure

    Publication Year: 1991 , Page(s): 1007 - 1012 vol.3
    Cited by:  Papers (1)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (320 KB)  

    Severely punctured versions of the well-known rate-1/2, constraint-length-seven convolutional code are considered. Severely punctured means that exactly half of the data normally transmitted is deleted, specifically, the entire output of one parity circuit or the other. Redundancy is conveyed only by the code tail. It is shown that, for maximum likelihood decoding of short to moderately long messa... View full abstract»

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  • A method for interference mitigation in space communications scheduling

    Publication Year: 1991 , Page(s): 431 - 435 vol.2
    Cited by:  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (400 KB)  

    A method to mitigate interference while minimizing unnecessary scheduling restrictions on the NASA tracking and data relay satellite system (TDRSS) network and user resources, based on consideration of all relevant communications parameters, has been developed. This method also can be used as the basis for analysis, evaluation, and optimization of user schedules with respect to communications perf... View full abstract»

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  • A new soft metric for FH/DPSK systems with coding and diversity in the presence of partial-band noise jamming

    Publication Year: 1991 , Page(s): 586 - 590 vol.2
    Request Permissions | Click to expandAbstract | PDF file iconPDF (316 KB)  

    A scheme is proposed to generate a soft metric based on L hard decision diversity outputs. The performance of this scheme is studied and compared with existing schemes. The target system used for investigation is a slow frequency-hopped differential phase shift keying (FH/DPSK) system in the presence of partial band noise jamming (PBNJ). It is shown that a significant improvement in ... View full abstract»

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