| Abstract: | A surface acoustic wave (SAW) correlator spread-spectrum (SS) receiver is
disclosed which utilizes a first demodulation stage with a chip length n
and a second demodulation stage with a chip length m to decode a
transmitted SS signal having a code length l=n.times.m which can be very
long (e.g. up to 2000 chips or more). The first demodulation stage
utilizes a pair of SAW correlators which demodulate the SS signal to
generate an appropriate code sequence at an intermediate frequency which
can then be fed into the second demodulation stage which can be formed
from another SAW correlator, or by a digital correlator. A compound SAW
correlator comprising two input transducers and a single output
transducer is also disclosed which can be used to form the SAW correlator
SS receiver, or for use in processing long code length signals. |