US 12,489,489 B2Granted

Detection and acquisition of signals over large doppler frequency ranges

AssigneeBAE Systems Information and Electronic Systems Integration Inc.

InventorsSteven W. Cox, Sara L. MacDonald, Alyssa N. Partridge, Michael J. Vinskus

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Abstract

Techniques are provided for detection and acquisition of signals. A methodology implementing the techniques according to an embodiment includes correlating an input signal with a code sequence at a first plurality of frequency offsets and generating a first bit vector representing locations of correlation detection peaks for each of the first plurality of frequency offsets; correlating the input signal with the code sequence at a second plurality of frequency offsets and generating a second bit vector representing locations of correlation detection peaks for each of the second plurality of frequency offsets; and generating a combined bit vector and accumulating the combined bit vectors over time. The method also includes identifying two consecutive correlation detection peaks in the accumulated combined bit vectors that are separated by a number of bit locations that correspond to a selected range of Doppler offsets; and generating a signal acquisition detection in response to the identification.

Claims20

Dependent claims

A signal acquisition system comprising:

a first acquisition processing bank configured to correlate an input signal with a code sequence at a first plurality of frequency offsets and generate a first bit vector representing locations of correlation detection peaks for each of the first plurality of frequency offsets;
a second acquisition processing bank configured to correlate the input signal with the code sequence at a second plurality of frequency offsets and generate a second bit vector representing locations of correlation detection peaks for each of the second plurality of frequency offsets;
a bank detection combiner coupled to the first acquisition processing bank and the second acquisition processing bank, the bank detection combiner configured to perform a logical OR of the first bit vector and the second bit vector to generate a combined bit vector;
and
a multi-peak detector coupled to the bank detection combiner and configured to accumulate the combined bit vectors over time, identify two consecutive correlation detection peaks in the accumulated combined bit vectors that are separated by a number of bit locations that correspond to a signal repetition rate modified by a selected range of Doppler offsets, and generate a signal acquisition detection in response to the identification.

2 more elements

A computer program product including one or more non-transitory machine-readable mediums encoded with instructions that when executed by one or more processors cause a process to be carried out for signal acquisition, the process comprising:

correlating an input signal with a code sequence at a first plurality of frequency offsets and generating a first bit vector representing locations of correlation detection peaks for each of the first plurality of frequency offsets;
correlating the input signal with the code sequence at a second plurality of frequency offsets and generating a second bit vector representing locations of correlation detection peaks for each of the second plurality of frequency offsets;
performing a logical OR of the first bit vector and the second bit vector to generate a combined bit vector;
and
accumulating the combined bit vectors over time;
identifying two consecutive correlation detection peaks in the accumulated combined bit vectors that are separated by a number of bit locations that correspond to a signal repetition rate modified by a selected range of Doppler offsets;
and
generating a signal acquisition detection in response to the identification.

5 more elements

A method for signal acquisition comprising:

correlating an input signal with a code sequence at a first plurality of frequency offsets and generating a first bit vector representing locations of correlation detection peaks for each of the first plurality of frequency offsets;
correlating the input signal with the code sequence at a second plurality of frequency offsets and generating a second bit vector representing locations of correlation detection peaks for each of the second plurality of frequency offsets;
performing a logical OR of the first bit vector and the second bit vector to generate a combined bit vector;
and
accumulating the combined bit vectors over time;
identifying two consecutive correlation detection peaks in the accumulated combined bit vectors that are separated by a number of bit locations that correspond to a signal repetition rate modified by a selected range of Doppler offsets, the selected range of Doppler offsets including Doppler induced sampling frequency offsets;
and
generating a signal acquisition detection in response to the identification.

5 more elements

Dependencies are inferred from the claim text.