Target location systems

DETAILED DESCRIPTION What we claim is: 1.
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship, means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb respectively which are arranged to increase progressively in frequency during each pulse to Fo+.
DELTA.
f and Fo+Fb+.
DELTA.
f respectively, where .
DELTA.
f is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding a filter bank the filter bank comprising a plurality of filters which cover in aggregate a predetermined frequency band, each filter being adapted to cover one slot, or section of the band whereby the bearing of a target from which an echo signal of the transmitter pulse signal is received is indicated in accordance with the slot or slots in which the echo signal is received.
2.
A target location system as claimed in claim 1 wherein the transducers are arranged to feed the filter bank via an envelope detector.
3.
A target location system as claimed in any one of claims 1 and 2, wherein the signal transmitter transducers are adapted for sonar applications.
4.
A target location system as claimed in any one of claims 1 and 2 wherein the signal transmitter transducers are adapted for use in a radar system.
5.
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship, means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb, respectively, which are arranged to increase progressively in frequency during each pulse to Fo+.
DELTA.
f and Fo+Fb+.
DELTA.
f, respectively, where .
DELTA.
f is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding frequency detector means operative to provide an indication of a target bearing in dependence upon the difference frequency between transmitted pulses reflected contemporaneously from the target to the receiving transducer means