Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna pattern plotting
Patent
1991-09-20
1992-12-15
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna pattern plotting
342173, 342383, H01Q 300, G01S 740, G01S 316
Patent
active
051721244
ABSTRACT:
Device and method for permanently checking the integrity of a transmission affected by parameters not directly accessible to measurement and whose influence on the modulus and phase of the field radiated in space can be determined by utilizing a mathematic model, the transmission being from an antenna array. Each antenna is supplied with one or more Hf carrier frequencies, each being modulated in a known way by one or more sinusoidal low frequency signals. First, a recording is made, at least at one point and during a time period T, of the amplitude of the combination of the signal received at this point and of a reference signal, having a fundamental frequency equal to one of the HF frequencies of the signal to be analyzed. Then, the amplitude of low frequency components of the signal thus obtained is extracted and memorized. Then, steps 1 and 2 are repeated n times (n is a whole number) in recording the signal at the same point and in carrying out, at each time, a phase shift of the reference signal by a quantity ##EQU1## k is a whole number successively assuming all values between 1 and n. The n amplitudes thus memorized are processed as the n values of function F(.alpha..sub.k), from which values certain coefficients of its Fourier transform are extracted. The operations 1 to 4 are then repeated at least as many times as there are points of measurement. Values of the unknown parameters are then determined using the mathematical model.
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Institute of Electrical and Electronics Engineers, Proceedings of the Annual Reliability and Maintainability Symposium, Washington, 28-30 Jan. 1975, U.S., New York, IEEE, 1975, pp. 179-187, Genese Fileccia, et al., "Mathematical Modeling of . . . ".
Becavin Henri
Louvard Charles
"Thomson-CSF"
Issing Gregory C.
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