Non-linear spread spectrum transmitter/receiver for a homing system
First Claim
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1. In a detection, track and homing system including a spread spectrum transmitter adapted to transmit signals to a remotely located target and a spread spectrum receiver adapted to receive signals reflected from the target in response to the transmitted signals impinging thereon where the velocities between the transmitter/receiver and the target are relatively high, surface acoustic wave apparatus providing doppler invariant pulse compression/expansion comprising:
- a. a piezoelectric base;
b. a plurality of spaced apart interdigitated fingers formed on a surface of said base and interconnected to provide an input transducer and an acoustically coupled output transducer; and
c. the fingers forming the output transducer having spacings therebetween which vary nonlinearly in a generally hyperbolic function for reducing frequency shift errors due to doppler effects.
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Abstract
A spread spectrum transmitter/receiver in a pulse ranging system including surface acoustic wave devices with a nonlinear transducer to reduce frequency shift errors due to doppler effects.
27 Citations
2 Claims
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1. In a detection, track and homing system including a spread spectrum transmitter adapted to transmit signals to a remotely located target and a spread spectrum receiver adapted to receive signals reflected from the target in response to the transmitted signals impinging thereon where the velocities between the transmitter/receiver and the target are relatively high, surface acoustic wave apparatus providing doppler invariant pulse compression/expansion comprising:
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a. a piezoelectric base; b. a plurality of spaced apart interdigitated fingers formed on a surface of said base and interconnected to provide an input transducer and an acoustically coupled output transducer; and c. the fingers forming the output transducer having spacings therebetween which vary nonlinearly in a generally hyperbolic function for reducing frequency shift errors due to doppler effects.
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2. A detection, track and homing system for use where the velocities between the system and a target are relatively high, said system comprising:
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a. a spread spectrum transmitter and receiver; b. expansion filter means and compression filter means connected in said transmitter and receiver, respectively, for providing the spread spectrum signals, each of said filter means including a surface acoustic wave device having a nonlinear transducer with interdigitated fingers having spacings therebetween which vary in a generally hyperbolic function for reducing errors due to doppler effects.
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Specification
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Current AssigneeMotorola, Inc. (Motorola Solutions, Inc.)
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Original AssigneeMotorola, Inc. (Motorola Solutions, Inc.)
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InventorsJohnson, Robert H.
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Primary Examiner(s)Tubbesing, T.H.
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Application NumberUS05/709,052Time in Patent Office441 DaysField of Search343/17.2 PCUS Class Current342/201CPC Class CodesG01S 13/282 using a frequency modulated...
