Communications: directive radio wave systems and devices (e.g. – With particular circuit – For pulse modulation
Patent
1994-12-02
1996-09-03
Lobo, Ian J.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
For pulse modulation
G01S 728
Patent
active
055527930
ABSTRACT:
A self-calibrating pulse compression system which is able to optimally compress a chirped waveform notwithstanding variations in the chirped spectrum due to changes in transmitter characteristics or other factors. In a most general sense, the inventive pulse compression system includes a first circuit (12, 14) for providing a first waveform, a second circuit (16, 30, 32) for sampling the first waveform at predetermined time intervals to provide a plurality of calibration samples, a third circuit (30) for storing the calibration samples; and fourth circuit (16, 28, 30) for multiplying a second waveform by the stored calibration samples. In a specific implementation, the first circuit of the self-calibrating pulse compression system includes an impatt chirp transmitter (12). The output of the transmitter (12) is fed to an antenna (18) and to a first switch (22) by a circulator (20). The switch (22) is controlled by a timing circuit (16) which may be implemented with software in a host computer. The output signal of switch (22) is downconverted and input to a tapped delay line (28). In the best mode, the tapped delay line is implemented with an acoustic charge transport device (ACT). The ACT has a programmable multiplier on each tap. In a calibration mode, the output of the transmitter is input into the delay line and the taps are sampled to provide a plurality of calibration samples which are stored in random access memory. In operation, the calibration samples are used to program the tap multipliers. When the transmitted waveforms are received, the waveforms are stored in the tapped delay line and multiplied by the tap weights to provide a compressed pulse.
REFERENCES:
patent: 3618095 (1971-11-01), Darlington
patent: 4117409 (1978-09-01), O'Brien
patent: 4384291 (1983-05-01), Lewis et al.
patent: 4404562 (1983-09-01), Kretschmer, Jr. et al.
patent: 4833479 (1989-05-01), Carlson
patent: 4926185 (1990-05-01), Wittenberg
patent: 4983979 (1991-01-01), McKenzie
patent: 5032843 (1991-06-01), Zilliox
patent: 5036328 (1991-07-01), Nakamura et al.
patent: 5278567 (1994-01-01), Nourrcier
Lent Lillian G.
McLeod Scott C.
Zerkowitz Avinoam S.
Brown Charles D.
Denson-Low Wanda K.
Hughes Missile Systems Company
Lobo Ian J.
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