Efficient high level parametric frequency converters

Abstract

Abstracts of Technical Papers 52 7The rms value of a' is a good estimate when a' has a broad spectrum, and the fourth root of the mean-square value of a" is a good estimate when a' is concentrated at low frequencies.with an Fhl rate of k radians/sec,'sec; then If the transmitted signal is a chirp pulse error in target position and resolution of target povitions (measured on the time axis) are approximately equal to k-1 times the error in target Doppler and k times the resolution of target Dopplers, respectively. In the case of frequency phase errors the error in measuring target positions and the ability to resolve target positions are found for an arbitrary transmitted pulse. For example, if B(o) is a 'rapidly varying function of then the resolution in target position is approxinlately the rms value of dB/&. In the chirp rase the accuracy of target Doppler and resolution of target Dopplers are found by introducing the appropriate constant.binary PN sequences of a given length, aSince there are only limited numbers of natural problem is how to construct periodic signals which are distinguishable, have good out-of-phase autocorrelation, and occupy the Same bandwidth. This occurs, for instance, when we wish to construct multiple-address systems for groups of satellites or to range several instrument packages simultaneously. Linear Codes for Burst-Error-Correction in Binary Arithmetic and TransmissionR. T. CHIEN, I B M Corp., Thomas J . Watson Res. Ctr., Yorktown Heights, N . Y. control in both arithmetic operations and data Linear residue codes are useful for error transmiMion. When used in data transmission, they do not require special coding equipment, as encoding and decoding operations may be msily carried out in digital computers. are used to construct linear residue codes for In this paper, number-theoretic concepts the correction of burst errors. A general theory the multiplicative group G(rl) modulo A, anis developed for the class of codes derived from odd integer; which consists of all the integers smaller than and relatively prime to A. Optimal linear residue codes for burst length two are also constructed.