System and method for sidelobe reduction using detect-and-subtract techniques
First Claim
1. A method for detecting a first target and a second target, said method comprising the steps of:
- transmitting a coded pulse signal for scattering by the first and second targets to generate a return signal;
receiving said return signal;
applying pulse compression to said return signal to produce a pulse-compressed signal;
operating on said pulse-compressed signal to identify a point spread function (PSF) corresponding to said first target, said point spread function having a peak and accompanying time-sidelobes;
subtracting said point spread function from said pulse-compressed signal to generate a residual signal; and
identifying a peak in said residual signal, said identified peak corresponding to said second target.
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Accused Products
Abstract
A radar system and method for detecting targets using pulse-compressed signals is disclosed. In one application, the systems and methods can be used to detect one or more relatively small targets whose pulse-compressed signals are masked by the time-sidelobes of a larger target'"'"'s return signal. The method includes an iterative, detect-and-subtract signal algorithm that processes the post-compressed signal to detect multiple targets. Specifically the processing algorithm operates on the post-compressed signal to identify a point spread function (PSF) that corresponds to the relatively large target. Once identified, the PSF corresponding to the largest target in the post-compressed signal is subtracted from the post-compressed signal to generate a residual signal. This residual signal, in turn, includes the PSFs for the other targets. This process of identifying and subtracting the PSF of the largest target in the residual signal is then repeated until all targets are detected.
15 Citations
20 Claims
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1. A method for detecting a first target and a second target, said method comprising the steps of:
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transmitting a coded pulse signal for scattering by the first and second targets to generate a return signal; receiving said return signal; applying pulse compression to said return signal to produce a pulse-compressed signal; operating on said pulse-compressed signal to identify a point spread function (PSF) corresponding to said first target, said point spread function having a peak and accompanying time-sidelobes; subtracting said point spread function from said pulse-compressed signal to generate a residual signal; and identifying a peak in said residual signal, said identified peak corresponding to said second target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for detecting a first target and a second target, said method comprising the steps of:
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transmitting a coded pulse signal for scattering by the first and second targets to generate a return signal; receiving said return signal; applying pulse compression to said return signal to produce a pulse-compressed signal; identifying a point spread function corresponding to said first target; subtracting said point spread function from said pulse-compressed signal to generate a residual signal; and identifying a peak in said residual signal, said identified peak corresponding to said second target. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A radar system for detecting a first target and a second target, said system comprising:
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a transmitter for transmitting a coded pulse signal for scattering by the first and second targets to generate a return signal; a receiver for receiving said return signal; a means for applying pulse compression to said return signal to produce a pulse-compressed signal; a means for operating on said pulse-compressed signal to identify a point spread function corresponding to said first target, said point spread function having a peak and a pair of time-sidelobes with said peak being indicative of said first target; a means for subtracting said point spread function from said pulse-compressed signal to generate a residual signal; and a means for identifying a peak in said residual signal, said identified peak corresponding to said second target. - View Dependent Claims (18, 19, 20)
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Specification