Method and device to measure the integrity of a transmission
US5172124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1991 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Sep 20, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S1/024
- WIPO fieldMeasurement
- WIPO sectorInstruments
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)…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.