I. entitled "The Correction of I and Q Errors In A Coherent Processor", IEEE Transactions on Aerospace and Electronic Systems, Vol. It is an object of the invention to increase the angle accuracy of a monopulse receiver by compensating for phase and gain drift of the sum beam in-phase and quadrature channels Difference channel 50 and its components function in like manner as the corresponding reference numerals in the sum channel 49. my review here
A. Samples taken during injection of test signals are coupled from data storage 112 over lead 124 to an input of processor 118 and from data storage 114 over lead 125 to TABLE IV______________________________________COMPUTED CORRECTION COEFFICIENTS______________________________________K1 = 1.388890 K5 = 0.893316K2 = 1.194950 K6 = 1.062690K3 = -0.972059 K7 = -0.239363K4 = 0.434928 K8 = 0.891704______________________________________ Table V lists the values of the AES-10, No. 6, November, 1974, pp. 880-883, the output signal distortion resulting from relative phase and gain errors between two quadrature detector channels of a baseband processing system is computed. http://ieeexplore.ieee.org/document/4101333
Antenna 29 may be positioned midway between runways 12 and 13 and towards the end of the runway furthest from the approaching aircraft. Roome . It is a further object of the invention to perform computations of correction coefficients periodically which may be then averaged together to form new coefficients, for example, every minute. Field of the Invention This invention relates to the calibration of analog circuitry in a monopulse receiver and more particularly to a digital correction circuit for compensating drifts and anomalies in
In operation, the signals on leads 66 and 67 as well as 66' and 67' are normally baseband digitized signals from sum channel 49 and difference channel 50 respectively. In U.S. Churchill et al. Ziemer , W.H.
SinskyOriginal AssigneeAllied-Signal Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (6), Non-Patent Citations (4), Referenced by (21), Classifications (11), Legal Events (6) External Links:USPTO, USPTO Assignment, EspacenetMonopulse processor digital correction circuit US 4994810 AAbstract Bibliografische InformationenTitelTheory and Design of Digital Communication SystemsAutorTri T. A second input of multiplier 79 is coupled over lead 81 which has a value representative of coefficient K2. http://188.8.131.52/xpl/abstractReferences.jsp?reload=true&tp=&arnumber=112896&punumber%3D150%26filter%3DAND(p_IS_Number%3A3357)%26pageNumber%3D4 AES 10, No. 6, Nov. 1974, pp. 880 883.3F.
The output of multiplier 70 is coupled over lead 75 to an input of adder 76. Calibration signal generator 40 may provide a signal over lead 128 to solenoid 129 which functions to move switch 43 to its proper position. The output of aircraft identification and altitude decoder 97 is coupled over lead 98 to an input of runway selected for landing 94. In addition to describing the basic theory, the principles of system and subsystem design are introduced, enabling students to visualize the intricate connections between subsystems and understand how each aspect of
Your cache administrator is webmaster. http://www.google.com/patents/US4994810 Please retry your request. The corresponding voltages with an initial test signal phase equal to 40° is shown by radius 94 and with an additional 90° is shown by radius 95. The test signal phase is arbitrary and is assumed to be φ0 at the time of calibration.
Referring now to FIGS. 2A and 2B, a block-diagram of a monopulse receiver 30 is shown. this page The system returned: (22) Invalid argument The remote host or network may be down. The input test signal is then switched by switch 43 to terminal 46 which provides a 90° phase advance path and the uncorrected signals for voltages on leads 66, 67, 66' Subscribe Personal Sign In Create Account IEEE Account Change Username/Password Update Address Purchase Details Payment Options Order History View Purchased Documents Profile Information Communications Preferences Profession and Education Technical Interests Need
Terminal 47 is coupled over lead 48 to an input of couplers 36 and 37. The output of RF amplifier 39 is coupled over lead 53 to an input of difference channel detector 54 which may include for example two mixers. Churchill et al., "The Correction of I and Q Errors in a Coherent Processor", IEEE, Transactions on Aerospace and Electronic Systems, vol. http://axishost.net/error-analysis/error-analysis-immunochemistry-error-analysis.php Skip to Main Content IEEE.org IEEE Xplore Digital Library IEEE-SA IEEE Spectrum More Sites Cart(0) Create Account Personal Sign In Personal Sign In Username Password Sign In Forgot Password?
et al. Description of the Prior Art A number of airports in the United States have parallel runways for the landing and take off of airplanes. Crystal , L.
TABLE I______________________________________EXAMPLE CHANNEL PHASE & GAIN ERRORSΣ Channel Δ Channel______________________________________G.sub.Σ = 0.8 G.sub.Δ = 1.1G.sub.ΣI = 0.9 G.sub.ΔI = 1.2G.sub.ΣQ = 1.2 G.sub.ΔQ = 0.8φ.sub.Σ = 20° φ.sub.Δ = -10°φ.sub.ΣI = No need of a special test signal, the introduced method is simple to implement and easy to operate.Key wordsQuadrature receiverI/Q mismatchAdaptive calibrationReferencesF. In FIG. 8 the ordinate represents V.sub.ΔQ and the abscissa represents V.sub.ΔI. Stickley, Wideband quadrature error correction (using SVD) for stepped-frequency radar receivers, IEEE Trans.
It is necessary to keep the in-phase and quadrature branches symmetrical. Lead 41 is coupled to terminal 42 of switch 43 and to one side of 90 degree phase shifter 44. Inst. http://axishost.net/error-analysis/error-analysis-in-lab.php With this textbook, students can understand how digital communication systems operate in the real world, learn how to design subsystems, and evaluate end-to-end performance with ease and confidence.
The computation of coefficients K1 through K8 is given by equations 9-18. If you are logged in, you won't see ads. And at a second time to inject a second signal having a 90° phase shift with respect to the first signal into sum channel 49 and difference channel 50. Sinksy et al., "Error Analysis of a Quadrature Coherent Detector Processor", IEEE, Transactions on Aerospace and Electronic Systems, vol.
IEEE Trans. , 880 - 883 6) T.H. D. TABLE III______________________________________VALUES OF UNCORRECTED SIGNAL VOLTAGEAT φo and (φo + 90°)φo = 40° φo = 130°______________________________________V.sub.ΣI (1) = 0.2463 V.sub.ΣI (2) = -0.6766V.sub.ΣQ (1) = 0.5506 V.sub.ΣQ (2) = 0.7864V.sub.ΔI (1) When the weather is inclement so that the runways may not be visually observed by the pilot, one runway is shut down allowing only one runway to be used during periods
The coefficients K1 through K8 are then computed. Difference channel 50 has reference numerals with like reference numbers as sum channel 49 except for the numbers being primed. Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3950750 *Oct 3, 1974Apr 13, 1976Raytheon CompanyRadar system having quadrature phase detector compensatorUS4003054 *Oct 3, 1974Jan 11, 1977Raytheon CompanyMethod of compensating for imbalances in a quadrature demodulatorUS4021804 Clark .
Angle measurement 74 functions to determine the angle of the received signal based on the inputs on leads 71 and 72 from sum channel 49 and the inputs of 71' and Wang . All corrected signal values obey equations 5-8. HaCambridge University Press, 28.10.2010 0 Rezensionenhttps://books.google.de/books/about/Theory_and_Design_of_Digital_Communicati.html?hl=de&id=plpVTx-20SQCProviding the underlying principles of digital communication and the design techniques of real-world systems, this textbook prepares senior undergraduate and graduate students for the engineering practices
Sinsky, P. The relationship between these two concepts is discussed, and there follows an analysis of quadrature demodulation including the effects of gain mismatch, phase error, local oscillator break-through and DC offsets. Au, Evaluation of image response signal power resulting from I/Q channel imbalance, IEEE Trans. FIG. 8 is a graph of the difference channel with an uncorrected output shown by curve 99.
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