# The phase signal,

(57) Abstract:

The invention relates to the field of radar and radio navigation, in particular the phase direction finders. Proposed phase signal with N antennas, in which the outputs of the antennas introduced N managed discrete phase and frequency adder. The phase difference of the signals required for each pair of antennas are computed in the digital processor through a set of values of the amplitude envelope of the total signal obtained from the output of the receiver the total signal at different combinations of phase shifts in the phase, sequentially installed during each working cycle of the direction finder. The proposed device can be used for the phase direction finding sources of narrowband signals in the plane or in space that is achievable technical result. 1 Il. The invention relates to the field of radar and radio navigation, in particular for direction finders for determining the direction to the measurement of the phase shift of the signals taken from the diversity antenna.Known phase DFS, the action of which is based on forming the vector sum of the signals received by a pair of spaced antiplatelets the amplitudes of the four parallel generated vector sum signals, corresponding to the four values of the phase shift between the summed signals. The direction finders of this type are described, for example, in U.S. patent N 3.631.491, NCI 343/113R, MKI G 01 S 3/46 and in the French patent N 2.718.252, MKI G 01 S 3/04 (application N 9403665 from 29.03.94).Closest to the claimed device is direction finding, described in the French patent N 2.718.252. The known device comprises N antennas, the shaper is the four vector of the amounts of the high-frequency switches, inputs and outputs, multi-channel receiver with envelope detectors and ADCS on the outputs of each channel, the digital processor. A disadvantage of the known device is the low accuracy due to the variability and instability of the transfer characteristics of the phase-shifting and switching of high-frequency elements and the complexity of the schemes. An object of the invention is to improve the accuracy.The solution of this problem is achieved by the fact that the direction finding device containing N antennas and connected in series receiver envelope detector and the ADC output and a digital processor, put N managed the discrete phase with the number of positions on the phase shift M is greater than two and increments the phase shift 2/M, Blo is ately included respectively between the outputs of the antennas and high-frequency inputs of the adder, the output of which is connected to the receiver input, control inputs of the phasers are connected respectively to the N outputs of the control unit phasers, the input of the synchronization signal which is connected to the output of the synchronization signal digital processor generating the measurement result of the phase difference signal_{m,n}for each of the desired m-th, n-th pair of antennas according to the algorithm:

(1)

where: i = 1, 2,... (M

^{N}-1), M

^{N}- the current number of combinations of phase shifts in the phase, sequentially set within a working cycle;

(

_{m}-

_{n})

_{i}- the difference of phase shifts in the phase of the m-th, n-th pair of antennas;

x

_{i}the reference ADC output of the receiver when the i-th combination of phase shifts in the phase.The work of the proposed direction finder is illustrated a block diagram and a description of the operating principle. On the block diagram indicated:

1 antenna; 2 - driven discrete phase shifter; 3 - control unit phasers; 4 - high frequency adder; 5 receiver envelope detector and the ADC output; 6 - digital processor.Managed a discrete phase 2 included between the outputs of the antennas and, accordingly, high-frequency inputs of the adder 4. digital processor 6. The first output of the digital processor 6 is the output of the measurement result. The second output of the digital processor 6 is the output of the sync signal and is connected to the input of the synchronization signal control unit 3. The outputs of the control unit 3 is connected with the control inputs of the controlled discrete phase 2.The antenna is made in the form sabnapravlenii emitters, beam width which covers the expected range of angles of bearing. Phasers made on ferrites or semiconductor diode with electronic control. The control unit is made on the basis of the binary register or counter with the shapers of currents or voltages at the outputs of the bits.The device works in cycles, consisting of consecutive heartbeats. In each i-th step of the working cycle of the digital processor 6 generates the control unit 3 phasers synchronization signal containing the number i of this measure. The control unit 3 generates a combination of currents and voltages required for installation in controlled discrete phase 2 specific combination of phase shifts corresponding to the number i of this measure. After the end of the transient processes in manageable the La x

_{i}from the output of the receiver, stores it, and outputs the synchronization signal containing the number of the new (i + 1)-th cycle. After completion of all cycles of the operating cycle, the total number of which is equal to the number of all possible combinations of States of phasers, digital processor computes estimates of the differences between the phases of the signals in all of the required pairs of antennas in accordance with the algorithm (1).It is assumed that the cycle time measurement is significantly less than the correlation time of the signal amplitude.The work of the proposed device is based on the use of voltage as a function of x at the output of square-law detector, envelope amount N of high-frequency signals from their amplitudes a

_{k}the initial phases

_{k}and from the values of phase shifts

_{k}the phasers. This dependence is described by the expression:

(2)

If you have the required set of known values

_{k,l}=

_{k}-

_{l}expression (2) form a system of equations that can be solved relatively unknown quantities

_{k,l}=

_{k}-

_{l}.

In the proposed device uses M positional phasers with discretes for phase 2/M, M is an integer greater than two. In each working cycle resets all in the Yes (2) corresponds to the algorithm (1), implemented with a digital processor.Because of the symmetry of the input part of the proposed device has the effect of balanced suppress the influence of the amplitude and phase errors of the phasers on the bearing measurement.The proposed device can be used for the phase direction finding sources of narrowband signals in the plane or in space. The phase signal containing N antennas and connected in series receiver with a detector of the flexor and the ADC output and a digital processor, characterized in that it introduced N managed the discrete phase with the number of positions on the phase shift M is greater than two and increments the phase shift 2M, the control unit phasers, high-frequency adder with N inputs, while managed discrete phasers included respectively between the outputs of the antennas and high-frequency inputs of the adder, the output of which is connected to the receiver input, control inputs of the phasers are connected respectively to the N outputs of the control unit phasers, the input of the synchronization signal which is connected to the output of the synchronization signal digital processor generating the result measured is/BR> where i=1,2,...(M

^{N}-1);

M

^{N}- the current number of combinations of phase shifts in the phase, sequentially set within a working cycle;

(

_{m}-

_{n}the difference of phase shifts in the phase of the m-th, n-th pair of antennas;

X

_{i}the reference ADC output of the receiver when the i-th combination of phase shifts in the phasers.

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