• Title, Summary, Keyword: Receiver

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Software GNSS Receiver for Signal Experiments

  • Kovar, Pavel;Seidl, Libor;Spacek, Josef;Vejrazka, Frantisek
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.391-394
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    • 2006
  • The paper deals with the experimental GNSS receiver built at the Czech Technical University for experiments with the real GNSS signal. The receiver is based on software defined radio architecture. Receiver consists of the RF front end and a digital processor based on programmable logic. Receiver RF front end supports GPS L1, L2, L5, WAAS/EGNOS, GALILEO L1, E5A, E5B signals as well as GLONASS L1 and L2 signals. The digital processor is based on Field Programmable Gate Array (FPGA) which supports embedded processor. The receiver is used for various experiments with the GNSS signals like GPS L1/EGNOS receiver, GLONASS receiver and investigation of the EGNOS signal availability for a land mobile user. On the base of experimental GNSS receiver the GPS L1, L2, EGNOS receiver for railway application was designed. The experimental receiver is also used in GNSS monitoring station, which is independent monitoring facility providing also raw monitoring data of the GPS, EGNOS and Galileo systems via internet.

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Thermal Performance of Air receiver with a Change of Flow direction for Dish Solar Collector (공기식 흡수기의 유동 방향에 따른 $5kW_t$급 접시형 태양열 집열기의 열성능 분석)

  • Seo, Joo-Hyun;Kang, Kyung-Moon;Lee, Ju-Han;Oh, Sang-June;Seo, Tae-Beom
    • 한국신재생에너지학회:학술대회논문집
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    • pp.182-185
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    • 2008
  • The thermal performance of air receiver with a change of flow direction for dish solar collector. This system is installed and operated in Incheon, Korea. The thermal capacity of the system is about 5 kW thermal. The aperture diameter of the cylindrical-shape receiver which is made of stainless steel is 100 mm, and the height is 210 mm. Experiments are being carried out to investigate the thermal performance variation of the receivers with several design parameters such as the shape of the receiver, the flow directions and the flow rate of air. First, air flows into the upper part of the receiver, which is the opposite side of the aperture. After the air flows through the inside receiver, that goes out of the receiver through 3 exits which are located near the aperture. Second, air flows into the backside of the receiver, Which is the forward side of the aperture. After the air flows through the inside receiver, that goes out of the receiver through 1 exit. The results show that the system efficiency and receiver efficiency increase as the volume flow rate increases as expected.

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A Study on 1-Channel Monopulse Receiver (단일채널 모노펄스수신기에 관한 연구)

  • Kwon, Hyuk-Ja;Lee, Young-Jin;Jung, Jin-Woo
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.1
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    • pp.71-76
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    • 2014
  • In this paper, we proposed the 1-channel monopulse receiver which has the new configuration and described the operation procedures. Also, we compared and analyzed the proposal receiver and the general 3-channel monopulse receiver. As a result, it is apparent that the monopulse ratio of the proposal receiver is equal to that of the 3-channel monopulse receiver. The proposal receiver achieve the simple receiver configuration and the simple tracking procedures, as contrasted with the 3-channel monopulse receiver. Also, the proposal receiver has advantages in terms of size, weight, cost and power. Because the proposal monopulse receiver require 1-channel receiver and need not the signal processor in comparison with 3-channel monopulse receiver which require 3-channel receiver and need the signal processor.

Design and Fabrication of the 1-Channel Monopulse Receiver (단일채널 모노펄스수신기 설계 및 제작)

  • Kwon, Hyuk-Ja;Lee, Young-Jin;Kang, Byoung-Wook
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.12
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    • pp.3-9
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    • 2015
  • In this paper, we propose the operation procedures of the 1-channel monopulse receiver which achieves the new configuration. Also, we analyzed the monopulse ratio and the target angle accuracy of the fabricated receiver by using the monopulse signal generator developed for verifying the proposal equipment. As a result, it is apparent that the monopulse ratio of the proposal receiver is equal to that of the 3-channel monopulse receiver. Also, the fabricated receiver exhibits the target angle accuracy with fewer than 0.1 RMS. The proposal receiver achieves the simple receiver configuration and the simple tracking procedures, as contrasted with the 3-channel monopulse receiver. Also, the proposal receiver has advantages in terms of size, weight, cost and power. Because the proposal monopulse receiver requires 1-channel receiver and needs not the signal processor in comparison with 3-channel monopulse receiver which requires 3-channel receiver and need the signal processor.

Numerical Analysis on Heat Transfer Characteristics of a Heat Pipe Type Solar Thermal Receiver According to Internal Geometry Variation (고온 히트파이프식 태양열 흡수기의 내부형상 변화에 따른 열전달 특성의 수치해석)

  • Park, Young-Hark;Boo, Joon-Hong;Kang, Yong-Heack
    • 한국신재생에너지학회:학술대회논문집
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    • pp.165-168
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    • 2008
  • A numerical analysis was conducted to predict the heat transfer characteristics of a solar receiver which is subject to very high heat fluxes and temperatures for solar thermal applications. The concentration ratio of the solar receiver ranges 1000 and the concentrated heat is required to be transported to a certain distance for specific applications. This study deals with a solar receiver according to internal geometry variation incorporating high-temperature heat pipe. The isothermal characteristics in the receiver section is of major concern. The diameter of the solar thermal receiver was 120 mm and the length was 400 mm and the angle of receiver end wall set $90^{\circ},\;60^{\circ},\;45^{\circ},\;30^{\circ}$. And the diameter of the heat pipe was 12.7 mm, 48 axial channels of the same dimensions were attached to the outer wall of the receiver with even spacing in the circumferential direction. The channels are changed to high-temperature sodium heat pipes. Commercial softwares were employed to deal with the radiative heat transfer inside the receiver cavity and the convection heat transfer along the channels. The numerical results are compared and analyzed from the view point of high-temperature solar receiver.

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Analysis about Threshold Measurement Test Result of LEO Satellite Receiver (저궤도 위성 Receiver의 Threshold측정 시험 결과에 대한 분석)

  • Jo, Seung-Won;Gwon, Jae-Uk;Choe, Jong-Yeon;Choe, Seok-Won
    • Aerospace Engineering and Technology
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    • v.5 no.2
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    • pp.77-84
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    • 2006
  • We should measure receiver tracking threshold and command threshold of the satellite in Integrate System Test (IST) in order to check the normal received power range of LEO(Low Earth Orbit) satellite S-band receiver. In this paper, the algorithm of threshold measurement is examined and the result measured in Integrated System Test is displayed. And than, the factor could have an effect on the result of threshold measurement except the capability of receiver itself was analyzed and compensated as many as distorted value according to that analysis.

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Receiver DCB Estimation and Analysis by Types of GPS Receiver

  • Choi, Byung-Kyu;Chung, Jong-Kyun;Cho, Jeong-Ho
    • Journal of Astronomy and Space Sciences
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    • v.27 no.2
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    • pp.123-128
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    • 2010
  • This paper analyzes that the global positioning system (GPS) receiver differential code bias (DCB) has effect on the estimation the ionosphere total electron content (TEC). The data from nine permanent GPS sites of the Korea Astronomy and Space Science Institute (KASI) were used for the estimation of the receiver DCB before (Trimble 4000 SSi) and after (Trimble NetRS) the receiver replacement, using the singular value decomposition method. The results showed that the estimated mean value of the receiver DCB varied from 0.11 ns (nanosecond) to 7.54 ns before the receiver replacement, but the receiver DCBs shoed large values than 20 ns except some stations after the replacement. The receiver DCB showed a relatively large difference by types of the receivers, and, as a result, it had a great effect on the estimation the ionosphere TEC using GPS.

Conformance Test for the Terrestrial DMB Broadcast Web Site (지상파 DMB 방송웹사이트 송수신 정합 시험 기술)

  • Moon, Su-Han;Kim, Yong-Han;Chae, Young-Seok
    • Proceedings of the KIEE Conference
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    • pp.75-77
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    • 2006
  • In this paper, the technology of the conformance test for Broadcast Web Site Service (BWS) which is one of the data services of the T-DMB (Terrestrial Digital Multimedia Broadcasting) is proposed. First, the standard of the BWS Service is introduced and then the method of the conformance test of BWS bitstream and BWS receiver module is provided. A BWS bitstream analyzer is implemented for use in verifying the transmitted BWS bitstreams. To provide a means for the receiver manufactures to verify their own BWS receiver modules, a receiver test suite is developed including BWS test bitstreams and a BWS reference receiver module. The BWS bitstream analyzer includes the analysis function for the conformance test of MOT protocol, HTML, PNG, MNG, JPEG, and Ecma Script. Also, it was actually used for verifying the BWS test bitstreams. In the course of developing a HWS receiver module, 4he BWS receiver module under test can be verified by comparing the results of the BWS reference receiver module with those of the receiver module under test. when the same BWS test bitstreams are fed into the two receiver modules.

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Optical Signals Using Superposition of Optical Receiver Modes

  • Lee, Jae Seung
    • Current Optics and Photonics
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    • v.1 no.4
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    • pp.308-314
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    • 2017
  • A particular optical receiver has its own optical receiver modes (ORMs) determined by its optical and electrical filters. Superposing the ORM waveforms at the transmitter, we can generate a new type of optical signals, called ORM signals. After optical detection, they produce pre-specified voltage waveforms accurately, which is advantageous for digital signal processing. Assuming a Gaussian optical receiver, where the optical and electrical filters are Gaussian, we illustrate various phase-shift keying ORM signals using two ORMs by changing their relative phase. We also illustrate multi-level ORM signal patterns using two or more ORMs.

Performance Analysis of FFH/MFSK System with Clipper Receiver in the Presence of Multitone Interference (다중톤 재밍 환경에서 clipper 수신기를 사용하는 FFH/MFSK 시스템의 성능 분석)

  • 전근표;곽진삼;권오주;박재돈;이재홍
    • Proceedings of the IEEK Conference
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    • pp.15-19
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    • 2003
  • In this paper, the bit error rate (BER) performance of the fast frequency hopping/M-ary frequency shift keying system using the clipper receiver is analyzed by using the characteristic function (CF) technique in the presence of n=1 band multitone jamming and additive white Gaussian noise environment. The CFs of the clipper receiver outputs are derived as a infinite series representation using Gamma function and Marcum's Q -function. The analytical results are validated with various simulation results. Performance comparisons with linear combining receiver are shown that the BER performance of the clipper receiver is much better than that of the linear combining receiver In addition, as the clipping level approaches to infinity, it is shown that the clipper receiver simply performs a linear combining without clipping and there exists an optimum value of diversity level (the number of hops per symbol) that maximizes the worst case BER performance of the clipper receiver.

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