Accession Number : ADD018545

Title :   Missile Telemetry Data Interface Circuit

Descriptive Note : Patent, Filed 18 Mar 96, patented 11 Mar 97

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Buchwitz, Guy R ; Snelgrove, Andrew H ; Sailer, Paul H

Report Date : 11 Mar 1997

Pagination or Media Count : 166

Abstract : An interface circuit for receiving an analog PAM telemetry data stream from a missile's telemetry unit. The PAM data stream comprises a waveform divided into 64 channels and includes a sync signal. The PAM data stream is supplied to a filter which removes from the PAM data stream subcarrier channel oscillator frequencies. The filtered data stream is next supplied to an analog-to-digital converter which converts each sample of the data stream to an equivalent twelve bit PAM data word which is supplied to a slave microprocessor. The slave microprocessor processes each of the sixty four PAM channels by utilizing a 25.6 kHz PAM clock signal generated by a PAM signal processing circuit. The slave microprocessor first checks for the sync signal. When the sync signal is decoded, the slave microprocessor sends a message to a master microprocessor via a dual port RAM indicating that the sync signal was located. The master microprocessor will respond with an acknowledgement message to the slave microprocessor. The slave microprocessor processes each channel of the PAM data stream in accordance with a predetermined algorithm which scales the PAM data providing a ten bit digital equivalent word for each channel of PAM data. The ten bit digital words for each of the sixty four channels of a frame of PAM data and a channel identification for each channel are output to a missile subsystem test set via three eight bit latches.

Descriptors :   *CIRCUITS, *TELEMETERING DATA, *PATENTS, ALGORITHMS, SIGNAL PROCESSING, DIGITAL SYSTEMS, MICROPROCESSORS, INTERFACES, ANALOG TO DIGITAL CONVERTERS, CHANNELS, TELEMETER SYSTEMS

Subject Categories : Telemetry

Distribution Statement : APPROVED FOR PUBLIC RELEASE