Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-09-30
1986-06-03
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
328162, 328184, G01S 1334
Patent
active
045932875
ABSTRACT:
A sweep linearization network for an FM/CW radar system, wherein the transmitter sweep rate is subject to variation as a function of range, is comprised of a sweep slope circuit for establishing a desired sweep rate for the interrogation signal of the radar transmitter; an accumulator/memory having stored therein a plurality of sweep slope coefficients corresponding to N discrete sweep segments of an individual sweep of the interrogation signal; a driver for developing a ramp signal controlling the sweep of the interrogation signal, which receives the sweep slope signal and, sequentially, the sweep slope coefficients for adjusting the ramp signal over each of the N sweep segments; a transmitter sampling circuit for developing a transmitter characteristic signal proportional to and indicative of the interrogation signal; a discriminator for dividing the transmitter characteristic signal into a plurality of equal frequency excursion time periods based upon a preselected amplitude thereof to develop a measured time signal proportional to and indicative of the frequency versus time relationship of the interrogation signal; a timing circuit for establishing N equal time periods over the duration of a single sweep to develop a comparison time signal; and a processor for comparing the measured time signal for the selected segment with the comparison time signal to develop an error signal proportional to and indicative of any sweep slope error over a corresponding time segment N.sub.i ; wherein the error signal is applied to the accumulator/memory circuit for updating the respective sweep slope coefficient and thereby sequentially linearize the sweep as a consequence thereof.
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Sotomayor John B.
The Boeing Company
Tubbesing T. H.
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