Cross-correlation arrangement

Details Cross-correlation arrangement Cross-correlation arrangement

G - Physics

01

R

354/141

G01R 23/02 (2006.01) G06F 17/15 (2006.01)

Patent

CA 1070840

ABSTRACT: Cross-correlation arrangement for determining the presence or absence of a signal x2(t) of known frequency in an unknown signal x1(t) if this signal x2(t) is present for at least a period of time ?o with an unknown starting instant. An auxiliary signal a1(t) is added to the signal x2(t). The sum signal is converted into one-bit code words s(nT) which are multiplied in at least a first correlation channel by one-bit code words yper(kT) which are stored in a storage medium having at least N/2 addressable storage locations. The code words yper(kT) are elements of a series {yper(kT)} which is formed by the code words which occur in a predetermined time interval having a length NT and which are of a non-periodical signal of the form sign [x2(t) + a2(t)]. The product code words obtained are added together in an integrator. This integrator is read each time after a time interval NT and reset. The absolute value of an output code word of the integrator is optionally added to corres- ponding code words of other correlation channels. The sum code words obtained in this way are integrated in a second integrator whose contents is continuously compared with a detection level. If No = ?o/T, N is smaller than No for example a factor of 3. The value of N determines the width of the detection characteris- tic. -36-

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