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Critical microwave component and receiver technologies are under development to reduce the risk, cost, volume, mass, and development time for a high-frequency microwave radiometer needed to enable wet-tropospheric correction in the coastal zone and over land as part of the accelerated Tier-2 NRC Decadal Survey-recommended Surface Water and Ocean Topography (SWOT) Mission. Current satellite ocean altimeters...
In-vehicle power line communication (PLC) provides a solution for high data communication in the automotive networks without increasing volume, weight and cost of the wiring harnesses. This paper presents the vehicle power line channel model. Also, we propose the design of baseband transceiver, which specifically aimed at this channel model. In transmitter part, the corresponding preamble structure...
This paper discusses a method for synchronizing the clock of a client computer using messages transmitted over the Internet from a remote server. The design principles would also be appropriate for other types of connections between the client and the server, provided only that the delay through the network connecting them is symmetrical on the average.
Synthetic Aperture Radar interferometry allows to measure spatio-temporal patterns of deformation. However this geodetic technique is limited by unwrapping difficulties linked with temporal decorrelation and topographic errors in partially incoherent and mountainous areas. This paper presents a new algorithm to correct and remove DEM errors in order to improve the phase unwrapping step. The method...
A high accuracy experimental platform for Ultra Wide Band (UWB) PN radar performance evaluation has been created. This PN radar platform could be used for the applications such as unmanned-aerial-vehicle anti-collision and short-range distance measurement etc [3]. It includes compact size X-band radar transceiver, baseband signal processing in FPGA, high speed analog to digital converter (ADC), and...
Recent literature shows that the performance of a bus with crosstalk is improved using a multi-threshold capture mechanism with the trade-off on the noise margin. This work proposes a method to generate error correction code suitable for multi-threshold receivers to circumvent the noise margin trade-off. The overhead of the proposed technique is significantly less than existing encoding techniques...
To investigate the characteristic of combustion noise in a non-road diesel engine, tests with different bio-diesel ratio fuel were conducted. According to the cylinder pressures of 100 consecutive combustion cycles, combustion noise was analyzed. The results show that, with the increase of blended bio-diesel ratio, both the maximum cylinder pressure and the maximum rate of pressure rise all have increasing...
Service-oriented Architecture (SOA) for sensor network applications aims at providing composable sensor network services supporting functionality within a specific application domain together with tools for service composition, so more complex functionalities can be composed of component services. In a distributed environment, such a scheme works by having a given component service choose other components...
Traditionally, a packet with errors, either due to channel noise or collisions, is discarded and needs to be retransmitted, leading to performance losses. Network Diversity Multiple Access (NDMA) handles collisions by combining a multipacket detection scheme with time diversity. In NDMA, the base station (BS) forces mobile terminals (MTs) to transmit J copies of each packet when J MTs collide. Diversity...
In this paper we propose a phase-sensitive pixel concept based on an avalanche photodiode (APD) with a charge sensitive amplifier (CSA) readout circuit, and its implementation in a standard CMOS technology. We exploit the principle of APD gain modulation to realize the functions of optical sensing and demodulation of light signals in one component, which can be exploited in several application domains,...
Force-feedback interaction with a bowed string model can suffer critically from noise in the velocity signal derived from differentiating position measurements. To address this problem, we present a model for bowed string interaction based on a position-constraint friction. We validate the proposed model by comparing to previous work using off-line simulations, and show measurements of interaction...
This fabric update summarizes recent advances for the Nanoscale Application Specific Integrated Circuits (NASICs) nanoscale computing fabric. We provide a brief overview of NASICs, and discuss recent work at all fabric levels. We present advances in device design and optimization including omega gated and junctionless nanowire field effect transistors, methodologies for validation of functionality...
Scheduling schemes of wireless networks determine packet transmission opportunities for each network node by considering network parameters such as link quality, transmission rate, and delay. However, security has not been taken into account in these schemes, although it plays a critical role in network performance. In this paper a new scheduling scheme is proposed to determine packet transmissions...
In this paper, optimal multiple channels cooperative spectrum sensing setting in non-identical environment is investigated. In previous work on cooperative sensing, all the secondary users have the same detection threshold and the noise received is independent identically distributed random variable. Thus researchers often assume that identical sensing time is assigned to the channels for spectrum...
Multipath error analysis under realistic conditions is often a necessary part of receiver performance assessment. To evaluate the effects of multipath it is necessary to isolate it form other errors. This paper re-visits the use of code-minus-carrier phase measurements for multipath error isolation and describes the steps necessary to get an output that can be easily analyzed during Global Navigation...
Power supply noise and ground bounce can significantly impact the circuit's performance. Existing delay testing techniques do not capture the impact of combined and uncorrelated power supply noise and ground bounce for critical path delay analysis. They capture the worst case power supply noise in order to obtain the worst case path delay. We show that such assumption is not necessarily sufficient...
In this paper we construct a long-distance VGA signal extending system featuring the self-tuning capability. The physical carrier of the signal is the typical local area network (LAN) cables such as CAT-5e. By investigating the noise distributions over the carrier a video restoration algorithm is proposed. The algorithm calculates the associated statistics and identifies the optimal IC control parameters...
A 7GHz-clock 1mV-input-resolution comparator is designed and simulated in a 65nm CMOS process. The comparator offset is compensated by changing the body voltages of the input differential triple-well NFET transistor pair. A reset switch is added between two regeneration nodes to further match voltages in reset phase. Kickback noise in this comparator is reduced by isolating regeneration nodes of the...
Accurate GNSS (Global Navigation Satellite System) time transfer needs accurate satellite orbit information. Since Nov. 2009, the GLONASS time transfer is introduced in UTC generation. The precise and timely GLONASS orbit information is indispensable for Circular T computation. In this paper, we compare the GLONASS orbits produced by different analysis centers. We study the differences of the products,...
The GNSS main technique currently used for accurate time and frequency transfer is the so-called “geodetic time transfer”, based on a consistent modeling of dual-frequency code and carrier-phase measurements. This technique enables frequency transfer with an uncertainty of 0.1 nanoseconds thanks to the very low noise level of the carrier phase measurements, but the accuracy of time transfer can only...
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