Accession Number : AD0638874

Title :   AN ADVANCED METEOROLOGICAL SOUNDING SYSTEM (DESIGN PLAN).

Corporate Author : MOTOROLA INC SCOTTSDALE ARIZ GOVERNMENT ELECTRONICS DIV

Personal Author(s) : Krasin,Elvin F. ; Wood,Kenneth J.

Report Date : 30 NOV 1965

Pagination or Media Count : 270

Abstract : The purpose was to provide a design plan for an optimum ground based vertical sounding system to obtain accurate meteorological data from balloon or rocket launched radiosondes. The report includes a description of an optimum system, a discussion of the performance requirement for the components, and an analysis of the slant range, altitude, and telemetry errors inherent in the proposed system. The optimum system provides continuous and automatic reception, extraction, reduction, and recording of slant range, telemetry, time, and antenna coordinates. Unambiguous slant range is determined by the time interval between start and stop pulses generated by a pseudo-noise (PN) code transmitted from the ground, turned around by the transponder, and received by the ground station. Telemetry is accommodated by two channels, one continuous and the other time division multiplexed. The commutated channel also provides calibration information for all sensors. The system design uses solid state devices throughout, with reliability and long life emphasized in the ground equipment and simplicity, low cost, and low power drain emphasized in the radiosonde. The system design provides operation at slant ranges up to 300 km with only 35 mw of radiosonde transmitter power and a probable error in slant range of less than 100 feet. The multichannel telemetry is processed with a total system inaccuracy of less than 0.1 percent. The ground antenna design is discussed with the various trade-offs. (Author)

Descriptors :   (*METEOROLOGICAL PHENOMENA, *RADIOSONDES), METEOROLOGICAL INSTRUMENTS, TELEMETER SYSTEMS, TRACKING, SOUNDING ROCKETS, METEOROLOGICAL BALLOONS, PHASE LOCKED SYSTEMS

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE