Signal processing apparatus and method
First Claim
Patent Images
1. A method of processing signals received from an array of sensors comprising:
- sampling and digitally converting the received signals;
processing the digitally converted signals to provide an output signal, the processing including filtering the signals using a first adaptive filter that enhances a target signal of the digitally converted signals and a second adaptive filter that suppresses an unwanted signal of the digitally converted signals, and processing the filtered signals in a frequency domain to further suppress the unwanted signal;
determining a direction of arrival of the target signal; and
treating a signal of the received signals as an unwanted signal if the signal has not impinged on the array from within a selected angular range.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of processing signals received from an array of sensors is disclosed comprising the steps of sampling and digitally converting the received signals and processing the digitally converted signals to provide an output signal, the processing including filtering the signals using a first adaptive filter arranged to enhance a target signal of the digitally converted signals and a second adaptive filter arranged to suppress an unwanted signal of the digitally converted signals and processing the filtered signals in the frequency domain to suppress the unwanted signal further.
65 Citations
36 Claims
-
1. A method of processing signals received from an array of sensors comprising:
-
sampling and digitally converting the received signals; processing the digitally converted signals to provide an output signal, the processing including filtering the signals using a first adaptive filter that enhances a target signal of the digitally converted signals and a second adaptive filter that suppresses an unwanted signal of the digitally converted signals, and processing the filtered signals in a frequency domain to further suppress the unwanted signal; determining a direction of arrival of the target signal; and treating a signal of the received signals as an unwanted signal if the signal has not impinged on the array from within a selected angular range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
-
-
35. A method of processing signals received from an array of sensors comprising:
-
sampling and digitally converting the received signals; processing the digitally converted signals to provide an output signal, the processing including filtering the signals using a first adaptive filter that enhances a target signal of the digitally converted signals and a second adaptive filter that suppresses an unwanted signal of the digitally converted signals, and processing the filtered signals in a frequency domain to further suppress the unwanted signal; and determining a signal energy from the received signals and determining a noise energy from the signal energy; wherein the signal energy is determined by buffering N/2 samples of the digitized signal into a shift register to form a signal vector of the following form;
Where J=N/2; and
estimating the signal energy using th following equation;
where Er is the signal energy.
-
-
36. A method of processing signals received from an array of sensors comprising:
-
sampling and digitally converting the received signals; processing the digitally converted signals to provide an output signal, the processing including filtering the signals using a first adaptive filter that enhances a target signal of the digitally converted signals and a second adaptive filter that suppresses an unwanted signal of the digitally converted signals, and processing the filtered signals in a frequency domain to further suppress the unwanted signal; and determining a signal energy from the received signals and determining a noise energy from the signal energy; wherein the noise energy is determined by measuring the signal energy Er of blocks of the digitally converted signals and calculating the noise energy En in accordance with
EnK+1=EnK+(1−
α
)ErK+1Where the superscript K is the block number and α
is an empirically chosen weight.
-
Specification