Communications: directive radio wave systems and devices (e.g. – Clutter elimination
Patent
1986-12-16
1988-05-10
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
342201, G01S 1328
Patent
active
047439106
ABSTRACT:
Frequency domain, pulse compression CW radar apparatus comprises a frequency synthesizer which provides RF and IF CW signals and linear frequency modulator (LFM) which provides a saw tooth LFM ramp signal with the f.sub.LFM. A mixer combines the f.sub.LFM signal with the f.sub.RF signal to provide a CW radar signal having a frequency, (f.sub.RF +f.sub.LFM) for transmitting by a transmitter. A receiver receives time-delayed CW radar return signals reflected, for example, from clutter at a one range and from a target at another range. A second mixer down-converts the clutter and target return signals to an intermediate frequency for processing and a third mixer extracts the f.sub.LFM signal from the intermediate frequency clutter and target return signals to provide, in a frequency-time domain, rectangular wave, clutter and target signals. A time gate and a frequency notch filter are connected for receiving these rectangular wave signals, the notch filter having at least one frequency notch for filtering out the clutter signal while passing the target signal, assuming the frequency characteristics of the clutter and target signals are different from one another. A synchronization detector provides in phase (I) and quadrature (Q) components of the remaining target signal; an A/D converter and sampler digitizes and samples the I and Q signal components, the samples being sequentially processed in a FFT digital pulse compressor and in a FFT doppler processor to provide conventional range and doppler cell information.
REFERENCES:
patent: 4042925 (1977-08-01), Albanese et al.
patent: 4270209 (1981-05-01), Albanese
Hill Richard M.
Parton Richard D.
Sawyers James H.
Blum Theodore M.
Hayes, Jr. Donald E.
Hughes Aircraft Company
Karambelas A. W.
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