Accession Number : AD0625826

Title :   MISMATCH CORRECTION TECHNIQUES FOR TWIN-CHANNEL RECEIVERS.

Descriptive Note : Technical rept.,

Corporate Author : ILLINOIS UNIV AT URBANA RADIO RESEARCH LAB

Personal Author(s) : Henderson, John J.

Report Date : AUG 1965

Pagination or Media Count : 49

Abstract : The purpose was to determine, by means of system simulation with a digital computer, the magnitude of bearing error caused by receiving and amplifying the differential output voltages of a crossed-Adcock antenna array, and to examine two techniques for the improvement or elimination of this error. First, the magnitude of error in the calculated, instantaneous bearing which resulted from various degrees of receiver mismatch was determined. The interchanged amplifier technique for reducing mismatch error calculates two bearings, the first obtained with the normal system configuration and the second obtained with the two receivers interchanged, and averages them to arrive at a 'corrected' bearing. The correction signal technique applies a test or correction signal to both receivers periodically in order to determine the appropriate correction factors. Conclusion: The test signal method appears to have great versatility, stability, and accuracy. Errors can be held to very small values, even approaching zero, depending upon the frequency of test signal corrections. The method will necessarily have to be tested under actual field conditions, but this investigation indicates that favorable results should be expected.

Descriptors :   *RADIO DIRECTION FINDERS, *RADIO RECEIVERS, RADIO EQUIPMENT, CORRECTIONS, NAVIGATION COMPUTERS, DIGITAL COMPUTERS, RADIOFREQUENCY AMPLIFIERS, ERRORS, SIMULATION, RADIO SIGNALS, TEST METHODS, ANGLE OF ARRIVAL, ANTENNA ARRAYS, PHASE MEASUREMENT.

Subject Categories : Direction Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE