Method and apparatus for simultaneous synthetic aperture radar and moving target indication
First Claim
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1. An apparatus for producing simultaneous synthetic aperture radar and moving target indication, comprising:
- a plurality of waveform generators each producing as an output an independent radio frequency signal so as to produce a plurality of independent radio frequency signals;
wherein each of said plurality of waveform generators being independently controllable in frequency and phase;
a transmit/receive module havinga plurality of inputs and outputs, anda channel disposed between each corresponding pair of said plurality of inputs and outputs;
wherein each of said plurality of inputs of said transmit/receive module being connected to the corresponding output of each said plurality of waveform generators, andwherein said transmit/receive module further comprises means for;
modulating the amplitude and phase characteristics of at least one of said plurality of radio frequency signals transiting in either direction therethrough;
modulating any of said characteristics independently of any of said other characteristics; and
modulating any of said characteristics of any of said plurality of radio frequency signals independently of any other of said plurality of radio frequency signals;
a waveform control subsystem having means for applying signals to;
any of said plurality of waveform generators so as to control the frequency and phase of said radio frequency signal output therefrom; and
any of said disposed channels of said transmit/receive module so as to control said means for modulating said amplitude and phase characteristics;
at least one radio frequency radiating/receiving element being connected to at least one of said transmit/receive module outputs forradiating radio frequency signals into free space, andreceiving from free space radio frequency signals reflected from targets; and
a signal and data processor for extracting synthetic aperture image data and moving target indication data from received radio frequency signals.
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Abstract
Method and apparatus for simultaneous synthetic aperture radar and moving target detection. A plurality of independent radio frequency signals are generated and applied to separate radiating/receiving antenna elements. Signals are generated as basis functions, such that moving target detection and synthetic aperture radar signals are constructed from individual waveform components in space, time, frequency, and coding. Waveform components are sorted and combined at reception. Received data is simultaneously processed to extract synthetic aperture radar images and moving target indication detections.
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Citations
51 Claims
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1. An apparatus for producing simultaneous synthetic aperture radar and moving target indication, comprising:
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a plurality of waveform generators each producing as an output an independent radio frequency signal so as to produce a plurality of independent radio frequency signals; wherein each of said plurality of waveform generators being independently controllable in frequency and phase; a transmit/receive module having a plurality of inputs and outputs, and a channel disposed between each corresponding pair of said plurality of inputs and outputs; wherein each of said plurality of inputs of said transmit/receive module being connected to the corresponding output of each said plurality of waveform generators, and wherein said transmit/receive module further comprises means for; modulating the amplitude and phase characteristics of at least one of said plurality of radio frequency signals transiting in either direction therethrough; modulating any of said characteristics independently of any of said other characteristics; and modulating any of said characteristics of any of said plurality of radio frequency signals independently of any other of said plurality of radio frequency signals; a waveform control subsystem having means for applying signals to; any of said plurality of waveform generators so as to control the frequency and phase of said radio frequency signal output therefrom; and any of said disposed channels of said transmit/receive module so as to control said means for modulating said amplitude and phase characteristics; at least one radio frequency radiating/receiving element being connected to at least one of said transmit/receive module outputs for radiating radio frequency signals into free space, and receiving from free space radio frequency signals reflected from targets; and a signal and data processor for extracting synthetic aperture image data and moving target indication data from received radio frequency signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. Method for producing simultaneous synthetic aperture radar and moving target indication, comprising the steps of:
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generating a plurality of independent radio frequency signals, each of said plurality having an independently variable frequency; and an independently variable first phase characteristic; applying frequency and first phase control signals so as to effectuate said variability; a first step of channelizing each of said plurality of independent radio frequency signals, wherein each of said plurality of channels has a corresponding input and output; applying amplitude and second phase control signals so as to vary the amplitude and second phase characteristics of at least one of said plurality of channels so as to modulate the amplitude and phase of said channelized radio frequency signals transiting in either direction therethrough, said step of applying further comprising; varying any of said characteristics independently of any of said other characteristics; and varying any of said characteristics of any of said plurality of channels independently of any other of said plurality of channels; radiating into free space at least one of said plurality of modulated, channelized radio frequency signals through at least one radio frequency radiating/receiving element being connected to at least one of said outputs of said plurality of channels; and receiving from free space radio frequency signals reflected from targets; and extracting synthetic aperture image data and moving target indication data from said received radio frequency signals. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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Specification