bisignal detection finding
indetermination functions of the first and second kind
The arithmetic formulas of potential precisions of bisignal detection finding obtained by employment of linearization method random arguments.
The indetermination functions of the first and second kind introduced at theoretical analysis. They reflect system reaction at emission one from two sources with signals of unit amplitude and zero phase in center antenna system. These functions determined by parameters of antenna system and mutual location of radiator (emitter) and direction finder.
As ensuring of employment capability of linearization method propose the functional transformation of random phase into secondary magnitude with distribution law arc sine type. It has been showed, that errors of single-purpose detection finding on order exceed the potential possible errors at simultaneous receiving two signals, determine by derivative by bearing indetermination function first kind, reduce with increasing parameter separation, numbers antenna and relation of signal/interference. The potential precisions of double-purpose direction finding have maximum at interference compensation from known direction. They increase with increasing angular distance to Cramer-Rao limiting boundary. Mean square error is defined by multiplying this boundary on correcting multiplier, depending from the indetermination function first or, at indication inaccuracy of direction to interference, second kind.
For the qualificatory example of pentaelemental annular with a half-wave wigging of neighbors antennas were defined and confirmed by dependence simulation errors of direction finding from the angular distances between sources. It has statistical modeling been installed, that not the accounting of the fact of the interference absence call increase error of double-purpose direction finding into a two times relatively limit boundary. It designates necessity of estimates of signal numbers with a transition to direction finding algorithms conforming to the situation.
For the experimental estimates of double-purpose direction finding on principle necessary determination of belong to measured bearings to sources. It has been proposed employment of classification under criterion of maximum probability with a filing of known into experiment information about the veritable bearings and relation of signal/interference. Change of classification rules substantially influences up on estimates errors, especially in domains of small angular distances. It testifies about necessity of specify of these rules at researches and testing of the multisignal direction finding materiel.
The article contains 9 illustrations, reference index from the 5 sources.