Patent RU-2284545-C2 (RU)
Inventor: BAJLOV VLADIMIR VASIL EVICH
IPC: G01S7/40
Filed: 2004-06-24
Granted: 2006-09-27
Abstract: FIELD: radio engineering. 
     SUBSTANCE: system can be used for detection of radio radiation sources and for measurement of radiated signals frequency when they are directed onto source. Radio inspection naval system has N receiving channels mounted on boards - by N/2 at each board, even receiving channels signals adder, odd receiving channels signals adder, even receiving channels frequency-measuring unit, odd receiving channels frequency-measuring unit, unit for analog-to-digital conversion of results of measurements and for finding bearing onto radio radiation source, two switches and two high frequency amplifiers. Any receiving channel of the system has receiving aerial connected in series with high frequency amplifier, power divider, which has output to be first output of receiving channel, and receiver, which has output to second output of receiving channel. Radiation patterns of receiving aerials in plane of direction finding cross at level which is equal or higher than 0,5; in total they cover sector of 360 degrees. Inputs of even receiving channels signals adder are connected with first outputs of even receiving channels. Output of adder is connected with input of even receiving channels frequency measuring unit. Inputs of odd receiving channel signals adder are connected with first outputs of odd receiving channels. Output is connected with input of odd receiving channels frequency measuring unit. First N inputs of unit for conversion of results of measurements and for finding direction onto radiation source are connected with second outputs of receiving channels. (N+1)-st input is connected with output of even receiving channels frequency measuring unit. (N+2)-nd input is connected with output of odd receiving channels frequency-measuring unit. Output is connected with control inputs of first and second switches correspondingly. Outputs of switches are connected with inputs of first and second high frequency amplifiers correspondingly. Phase difference measuring unit is introduced into the system. First and second inputs of phase difference measuring unit are connected with outputs of first and second high frequency amplifiers correspondingly. Receiving channels power dividers are made four-channeled. Third and fourth outputs of power dividers have to be third and fourth outputs of receiving channels. Centers of opening of receiving aerials are spaced apart in direction finding plane for distance, which prevails wavelength of inspected signals, by one order. Third inputs of first to N-th receiving channels are connected with first to N-th signal inputs of first switch. N-th signal input of second switch is connected with fourth output of first receiving channel. Fourth inputs of second to N-th receiving channels are connected with first to (N+1)-st signal inputs of second switch. Output of phase difference meter is connected with (N+3)-rd input of device for analog-to-digital conversion and for finding bearing onto radiation source measurement results. Precise value of bearing is determined by phase method, which excludes errors caused by lack of identity of aerials and error in measurement of amplitudes of signals to be received.  
     EFFECT: simplified design; reduced number of aerials; high precision of direction finding; reduced errors. 
     2 dwg