| 摘要 |
The invention relates to means of radio-electronics for implementation of digital correlation radio direction finding. Method for digital correlation radio direction finding is in fact that radio radiation is received with two fixed, separated in space antennae with following preliminary selection, coherent frequency transformation within transmission band and amplification in two radio channels that are adjusted to given operation frequency Amplified with radio-channels at intermediate frequency radio-signals are transformed to digital form with determination of complex frequency spectra of those. After that one performs shift of those by frequency from band of intermediate frequency to band of working frequency through adding to values spectral components of those value of frequency shift that is equal to difference between given working frequency of adjustment of radio channels and intermediate frequency. After that one performs control of compensation parameter of one of radio-channels, as that linear-frequency phase shift for all its possible values is used, with implementation of transformation of shifted complex frequency spectrum of signal of respective radio-channel through adding to its phase-frequency component linear-frequency phase shift within boundaries of operating frequency band. One determines discrete cross-correlation interaction function of shifted transformed and not transformed complex frequency spectra of radio-signals. After that one determines limit value of linear-frequency phase shift that corresponds to maximal value of discrete cross-correlation function. After that by limiting value of linear-frequency shift determined, with account of spatial displacement of antennae, one determines direction to source of radio emission. The invention provides increase of accuracy of radio direction finding. |
