Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-03-12
1977-01-25
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 12MD, G01S 939
Patent
active
040054209
ABSTRACT:
A self telemetering miss-distance radar method and system of high sensitivity and free of second-time-around echoes is provided by phase modulating a continuous wave signal with the output of a repetitive code source such as a pseudo-random noise generator. That signal is transmitted as the radar signal. Returning echoes are applied to one input of a product detector to whose other input a sample of the unmodulated CW signal may be applied. The mixer output contains the product of the CW signal and the echo. The echo includes the CW signal modified to include the noise code and Doppler shift. That product signal is applied to a second product detector to which a delayed version of the noise code is applied. If the code in the echo arrives at the second product detector in unison with the delayed code, the output level will be high. If not, it will be low. The second detector output, the second product signal, is passed through a Doppler filter. If there was unison in the codes, the Doppler signal output will be large. In some applications, the first product detector may be omitted.
Doppler filter output can be used to frequency modulate the CW oscillator to develop a telemetering signal, or it can be used to generate digital signals which are added to the pseudo-random noise code generator output. In either event, the radar signal is modulated with current miss-distance information so that it serves as a telemetering signal for application to a separate antenna or to the radar antenna.
REFERENCES:
patent: 3216010 (1965-11-01), Roeschke
patent: 3246322 (1966-04-01), Kuecken
patent: 3289204 (1966-11-01), Murray et al.
patent: 3611370 (1971-10-01), Frasure et al.
patent: 3868686 (1975-02-01), Magorian
Esterline Electronics Corporation
Hubler Malcolm F.
Nienow Harvey C.
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