Spurious signal correction for surface acoustic wave (SAW) secur

Details Spurious signal correction for surface acoustic wave (SAW) secur Spurious signal correction for surface acoustic wave (SAW) secur

1988-11-25

1990-07-31

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

3408253, 307 102, 307 103, 310313R, 310313B, 333151, 333154, 342 44, 342 51, G01S 1374, G09C 100

Patent

active

049453548

ABSTRACT:
The invention features a theft resistant security system for motor vehicles. The system has receptacle with a coupling coil. A SAW (surface acoustical wave) device associated with the receptacle for relative movement thereto is also provided. The SAW device has a code and its own coupling coil for interaction with the receptacle coupling coil. A testing mechanism is connected to the receptacle for determining whether the code of the SAW device is valid for operation of the motor vehicle. Problems of crosstalk and wave reflection may produce spurious code pulses in systems of this type. The invention provides techniques for eliminating or reducing these unwanted pulses.

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