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Long Range TSPIGII Transponder Data Link (TTDL)


TTDLW2The TSPIGII Transponder Data Link illustrated in the above diagram employs Waddan TSPIGII (for position and heading of an airborne test article) and an efficient radio shown on the left. Early experiments used parts of a C-Band transponder as the analog front end of the data link to communicate with an FPS-16 radar (from Apollo era). The radar loop was temporarily modified using a CompactPCI based Radar Data Link Module (RDLM). The digital partition of the DLTM is implemented using Xilinx FPAGA as the core. TTDL can use either QPSK or GMSK data modulation scheme. The data rate required for TSPI transmittal is 256 k bits per second, and the bandwidth is 2 MHz With a little creativity the TTDL can be used for telemetry over ranges as long as 500 miles.

Aircraft Nodal Data Acquisition System (ANDAS)

ANDASW1 The Aircraft Nodal Data Acquisition System (ANDAS) is based upon the short haul ZigBee networking standard. It employs a number of thin microminiature sensor assemblies (MSAs) and a USB Host module. The MSAs are cemented for test measurements at several key locations (nodes) on a complex structure such as an aircraft. (Since the MSA has to be cemented on a smooth surface, all electronics components are placed on one side of the flex board). When prompted by the Host, they collect the measurement data, and transmit it to the Host. An MSA incorporates an integrated sensor (capable of measuring acceleration, pressure, temperature and surface strains), a microcontroller, a ZigBee transceiver and a battery for power. A power management scheme minimizes the use of the battery, thus, prolonging its life significantly. The Host module also incorporates a microcontroller and a ZigBee transceiver. At the current state of firmware development, an ANDAS cluster consists of a Host interacting with up to 16 MSAs with 30 Hz data update rate.

Wireless Optical Sensor Network

MethaneW1 The wireless design of this system is similar to that of ANDAS with one slight hardware improvement. The Zigbee transceiver function has also been merged in the microcontroller chip. The sensor partition is also modified to accommodate the porous optical gas sensing function. For higher sensitivity, the chip uses a spread-out waveguide sensing area.

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