Crosslink architectures for a multiple satellite system

Binder, R.; Huffman, S.D.; Gurantz, I.; Vena, P.A.

doi:10.1109/proc.1987.13706

Cited by 41 publications

(11 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, in [14], nodes in a spread spectrum system generate pseudo random schedules in order to reduce medium access interference. Apart from [15], which is targeted at satellite systems, existing schemes have mainly considered the use of pseudo-random time-slots in an effort to reduce collisions. For example, the MAC presented by Cao et al [9] requires nodes to assign a unique seed to each of their neighbors.…”

Section: Related Workmentioning

confidence: 99%

Pairwise: a time hopping medium access control protocol for wireless sensor networks

Chin

2009

IEEE Trans. Consumer Electron.

View full text Add to dashboard Cite

The availability of low cost, multifunctional embedded devices have become ubiquitous due to their wide ranging application that includes monitoring Radio Frequency Identification (RFID) tagged objects to ambient conditions such as temperature and humidity. Also, these devices can be equipped with a camera and then deployed in hostile environments. A key characteristic of these devices is that they can communicate wirelessly and form an ad-hoc, Wireless Sensor Network (WSN). Devices in a WSN then collaboratively monitor environment factors or objects, and forward data back to one or more central nodes. A key challenge in WSN is ensuring nodes operate in the order of months as they have limited energy resource, and it is impractical to replace their batteries due to their large numbers, and they may be deployed in inaccessible terrains. Hence, it is critical that these devices or nodes employ energy efficient protocols. To this end, we present PairWise, a novel, low power, time division multiple access (TDMA) based protocol for use in WSNs. PairWise is easily deployable in large scale WSNs as nodes are not synchronized globally. Instead, they synchronize and establish a pair of channels with each of their neighbors independently. Each channel hops pseudo randomly in time according to a seed and maximum rendezvous period (MRP). Hence, nodes using PairWise experience very minimal to no collision during communications. Apart from that, higher layer protocols are able to control the MRP of each channel such that a node's duty cycle matches the observed traffic load. We have implemented PairWise in the ns-2 simulator, and compared it to Sensor Medium Access Control (S-MAC) and a TDMA MAC. Our results show PairWise to have very low power consumption whilst ensuring packets have minimal delays. Moreover, PairWise has a high goodput with increasing node density, where goodput is defined as the number of packets that are transmitted by each node pair successfully over a give-n total number of packets.

show abstract

Section: Related Workmentioning

confidence: 99%

Pairwise: a time hopping medium access control protocol for wireless sensor networks

Chin

2009

IEEE Trans. Consumer Electron.

View full text Add to dashboard Cite

show abstract

“…For example, the average propagation delay at time 300 is .029 seconds for N3 and .034 seconds for N10, causing different queue sizes even though the traffic rates are the same. AI IocLc tc-hed1r-n .5 pk ts/sec ) 1 viding congestion "snapshots." The total simulated time shown corresponds to one-half of a full orbit.…”

Section: Examplesmentioning

confidence: 99%

“…A wide variety of such networks can be configured depending upon the particular mission requirements. They may range from networks with tightly stabilized and precision controlled satellites to networks that may employ a very large number of simply stabilized low-cost satellites whose proliferation provides a high degree of survivability [1]. Design of such networks is difficult due to the large number of variables associated with physical topologies, communications protocols, and operational requirements such as build-up, replenishment and reconfigurability.…”

Section: Introductionmentioning

confidence: 99%

Multiple Satellite Networks: Performance Evaluation via Simulation

Clare

Wang

Atkinson

1987

MILCOM 1987 - IEEE Military Communications Conference - Crisis Communications: The Promise and Reality

View full text Add to dashboard Cite

A simulation that models networks having satellites and Earth stations as intercommunicating nodes is described. The orbital mechanics and Earth rotation cause the topology to be dynamic as nodes move in and out of range of each other or are eclipsed by the Earth. Each node has a directive steerable beam transmit antenna and an omnidirectional receive antenna. Link access is accomplished using a pure ALOHA protocol with link level acknowledgments. Either random routing or deterministic routing can be selected. Message traffic is parameterized by the mean distance between source and destination. The performance evaluation capabilities of the simulation tool are demonstrated by consideration of specific cases, including the analysis of two satellite constellations that are special in that all orbits are circular and at equal altitudes; this symmetry simplifies performance characterization. Output statistics presented include the end-to-end and link level throughput, message delays, and queue sizes.

show abstract

“…A single satellite with a 12 h period in an elliptical orbit with an apogee at 40, 0o0 km and inclined at an angle of 63" from the *Now with INMARSAT H.Q. London equator can achieve an 8 h coverage of the visible earth, nearly from the equator to the poles. An example of such an orbit is the Molniya, from the well known Soviet satellite communication ~y s t e m .~ Recent studies have shown interest in 24 h period satellites, referred to as the Tundra t~p e .~,~ For both types, 24 h continuous coverage entails the use of several satellites.…”

Section: Introductionmentioning

confidence: 99%

Low earth orbit satellite systems for communications

Maral

Ridder

Evans

et al. 1991

Int. J. Satell. Commun.

View full text Add to dashboard Cite

It may be that we are now entering the era of LEO constellation satellite communications after thirty years of domination by the GEO systems. This paper heralds the coming of the new era with a tutorial approach to the system design and trade‐offs of LEO constellation system design. It discusses orbital configurations, network topologies and routeing considerations, multiple access schemes and link performance design. In so doing it brings out the major design parameters and how they interact with each other. Also considered are the service applications for the LEO constellation systems, and the important difference between real‐time and delayed communication systems is highlighted. Examples of single and multi‐beam (cellular) coverage system link designs are presented for L‐Ka frequency bands. Future papers will consider aspects of the LEO spacecraft and launchers.

show abstract

Crosslink architectures for a multiple satellite system

Cited by 41 publications

References 4 publications

Pairwise: a time hopping medium access control protocol for wireless sensor networks

Pairwise: a time hopping medium access control protocol for wireless sensor networks

Multiple Satellite Networks: Performance Evaluation via Simulation

Low earth orbit satellite systems for communications

Contact Info

Product

Resources

About