Considering the emphasis on network-centric concepts of warfare in recent battlefield environments, study location information has become more important. This is because most military weapons use GNSSs (Global Navigation Satellite Systems) such as GPS and Galileo to track position information. Situations which it impossible these systems have been increased by many factors jamming attacks, reception failure, politics. In this study, we propose a localization method that uses UAV (Unmanned...

Ground-based pseudolite systems have some limitations, such as low vertical accuracy, multipath effects and near-far problems. These problems are not significant in airborne-based systems. However, the monitoring of positions is required because mobility platforms on which pseudolites mounted, this causes performance degradation. To address these system we propose an airborne relay-based regional positioning that consists a master station, reference stations, relays user. In proposed system,...

In this paper, we propose a fast, dynamic slot assignment scheme to reduce timeslot access delay for newly arrived nodes in tactical ad hoc networks. As there is no central coordinator distributed networks, node conventional schemes must negotiate separately with each of its neighbors allocation. However, it not necessary all the neighboring specific case. This can result unnecessary join that reduces network efficiency and responsiveness. The proposed simplifies process by using mini-slots...

In this paper, we propose a scheme in which communication relay unmanned aerial vehicle (UAV) estimates the distribution of terminals and selects optimal position for autonomous maneuvering. order to accomplish mission success, warfighters on battlefield must communicate with their commander all time. Autonomous maneuvering UAV using proposed will support command effectively. first step scheme, time difference arrival received signal. Once is estimated, second step, altitude are determined,...

In this paper, we propose and analyze a cooperative relay scheme for time division multiple access (TDMA) protocol based tactical multi-hop wireless networks. the proposed scheme, neighbor of node can packet on behalf in order to improve throughput, without delay performance degradation. The node, that is, may not have its own transmit, whereas it owing broadcast nature networks, even though is intended receiver. As takes responsibility relaying packet, scheduled transmit another packet....

In this paper, we propose a novel dynamic slot-assignment scheme using artificial collisions called collision-based slot assignment (AC-DSA) for multi-hop networks, which is based on the in-band control mechanism. In-band control-based networks have no exclusively reserved slots newly arrived nodes; thus, throughput can be improved compared with that of out-of-band networks. node use idle to transmit its packet request assignment. However, if are available, cannot even though it has higher...

Position information is important for conducting battlefield missions. GPS generally enables allies to identify positions. RELNAV defined in Link-16 used JU the air estimate its position as an auxiliary navigation system of GPS. However, there a critical problem RELNAV. To operate accurately, requires presence ground reference units that help positions JUs operated by guaranteeing constant difficult. If not assured, have maintaining high positional quality. They depend on inertial systems...

In this letter, we propose relay-based positioning in time division multiple access (TDMA) networks, called RPT. Although the concept of is an improvement over performance relative navigation (RelNav), there are two problems to be solved when applying relay a TDMA network. First, measurement errors caused by mobility may degrade user accuracy because references transmit messages at their assigned times TDMA, unlike conventional systems, where all continuously transmit. Second, selection...

Link-16은 현재 미 공군 및 북대서양 조약기구 (NATO : North Atlantic Treaty Organization)에 의해 운용되고 있는 대표적인 전술데이터링크 (TDL Tactical Data Link)이며 멀티넷 구조를 지원한다. 이러한 환경에서는 Link-16의 단말 노드들이 동시에 전체 대역에서 도약함으로써 작전을 효과적으로 수행할 수 있다. 최근 항공 교통량이 급증함에 따라 이를 수용하기 위해 새로운 시스템을 도입하거나 기존의 확충해야 하며 운용하기 할당되어야 할 주파수 대역이 부족한 상황이다. 해결하기 Link-16에서 사용하는 대역의 재분배 계획이 예정되어 수행되어 운용을 위한 제한될 경우 다중 접속 간섭 발생률이 증가하게 되므로 성능 저하가 일어날 이로 인해 다양한 군사 수행하는데 어려움이 따른다. 따라서 본 논문에서는 부족 현상으로 Link-16 웨이브폼의 성능이 저하되는 문제를 그룹 기반의 도약 방식을 제안하였다. 모의실험을 통해 제안 사용할...

The airborne relay-based positioning system (ARPS), which employs the relaying of navigation signals, was proposed as an alternative system. However, ARPS has limitations, such relatively large vertical error and service restrictions, because firstly, user position is estimated based on relays that are located in one direction, secondly, processed using only relayed signals. In this paper, we propose enhanced algorithm to improve performance ARPS. main idea adaptable use either virtual or...

In this letter, we propose a fast dynamic slot assignment (F-DSA) protocol to reduce timeslot access delay of newly arrived node in ad hoc networks. As there is no central coordinator, needs separate negotiation with all the neighboring nodes for assigning slots itself. Thus, it may result network join and becomes an obstacle dynamically leave order deal issue better, F-DSA simplifies process. It provides frequent opportunities assign by using mini-slots share control packets short time....

본 논문은 통신 중계를 활용한 항법시스템에서 위치정확도 향상을 위한 측위 알고리즘을 제안한다. 중계 기반 항법시스템은 측위의 기준점이 되는 구성요소들이 한쪽 방향으로 분포하며 삼각측량법에 의해 위치가 계산되므로 시스템의 구조적 특성에 의한 수직오차가 수평오차에 비해 상대적으로 크게 발생한다. 제안하는 가상 기준점을 알고리즘에서는 항법메시지로부터 송신한 기준국의 위치와 기 추정된 사용자의 위치를 기준으로 새로운 가상의 생성하고 이를 활용해 재추정한다. 기준점은 위치로부터 거리가 가장 인접한 기준국을 선택함으로써 기하학적 요인에 영향을 최소화하도록 하였다. 통해 기준점들의 방향을 공중 및 지상으로 다원화함으로써 수직오차를 감소시켰으며, 기존 기반의 항법시스템보다 정확한 위치추정이 가능하다. 논문에서는 모의실험을 위치정확도가 향상됨을 확인하였다. In this paper, we propose a new positioning scheme for accuracy improvement...

Location information is utilized for a variety of purposes, such as military operation, Internet Things, big data, and application services. Problems can occur if location exposed, higher likelihood crime invasion privacy. In the battlefield, exposed data lead to significant losses because exposure secrets operation information. Existing transformation schemes protect have been studied. However, are not suitable real-time processing systems that use requires too much time. order solve this...

Pseudolite-based systems and airborne relay-based positioning system (ARPS) have a limitation wherein the position error increases as distance between user area where segments of are configured increases, owing to low altitude navigation signal transmitters. To enhance accuracy user, we propose self-correction scheme based on ARPS. In proposed correction scheme, each reference station adjusts transmission time signal. This adjustment is determined by calculating average pseudorange...

합동전술정보분배체계는 미국, 북대서양조약기구 및 기타 연합군에서 운용하고 있는 Link-16의 통신 터미널로 사용된다. 최근 민간 항공분야에서의 교통량 증가로 인해 주파수 수요가 급증함에 따라 Link-16에서 사용 중인 주파수는 다른 시스템에 재할당될 예정이며, 이는 성능에 영향을 미칠 것으로 예상된다. 따라서 본 논문에서는 대역 감소에 따른 Link-16 성능의 모의실험과 수치 해석을 통해 기존 성능과 비교하였다. 성능 분석 결과, Nakagami 페이딩과 부분대역 잡음 재밍 환경에서 주파수가 재할당된 Link-16은 성능이 감소됨에도 불구하고 높은 항재밍 능력을 유지하였으며, 동일 시간슬롯에서 다수 사용자들을 지원할 수 있음을 확인하였다. The joint tactical information distribution system (JTIDS) is used as the communication terminal of by United States armed forces,...

In this paper, we analyze the analog network coding ALOHA (ANC-ALOHA) system using tagged user approach (TUA). ANC-ALOHA is first random access scheme to apply slotted for throughput enhancement of a two-way relay channel. We performance an with propagation delay, finite population and buffer capacity. This model more practical than one infinite single buffer. Under assumption that statistical behavior all users identical, TUA can solve complicated buffered without computational complexity...

The universal access transceiver (UAT) is interesting as an alternative pseudolite because pseudoranging available using ground segment messages. However, there a limitation that accurate ranging not supported when the user altitude low, of geometrical and multipath effects. In this study, we investigated application airborne relay-based positioning system (ARPS) to UAT, ARPS has advantages ground-based airborne-based well suited UAT frame. UAT-embedded ARPS, reference stations transmit...

In this paper1, we propose an aerospace relay-based positioning scheme for regional in the battlefield where a global navigation satellite system (GNSS) is not available because of signal jamming or blocking. proposed scheme, aeronautical nodes and satellites, called nodes, are used to relay broadcast from ground reference stations. The user receives these relayed signals estimates positions its own using arrival time differences times signal. However, position difficult determine geometric...

본 논문은 상대항법의 성능을 개선하기 위해 공중 중계 기반 측위 기법을 시분할다중접속 네트워크에 적용하는 융합 제안한다. 기반의 환경에서 운용하기 위해서는 새로운 슬롯 할당, 중계국 선택, 항법신호 손실 시 대체 방안 등의 문제가 해결되어야 한다. 측위기법의 서브프레임 구조는 항법신호를 방송 및 중계하는 구간과 데이터와 PPLI(Precise Participant Location Identification) 메시지를 송신하는 데이터송신 구간으로 구분되며, 구간을 연속적으로 할당함으로써 메시지 수신 동안 수신기 이동에 의한 영향을 최소화하였다. 또한, 각 기준국에서 수신한 정보를 바탕으로 추정된 단말과 중심국과의 거리 이용해 서비스 지역에 고르게 분포하는 단말을 중계국으로 선정한다. 마지막으로 항법신호의 손실로 인해 측위가 불가능한 경우를 대비하여 구간에서 수신되는 PPLI 선택하고 이를 추정에 활용하는 방안을 제안하였다. 논문에서는 모의실험을 통해 제안하는 기법이 상대항법...