SU1541631A1 - Multichannel correlator - Google Patents

Abstract

The invention relates to specialized computer aids and is intended to determine the autocorrelation function of a stationary random process in real time, in particular in spectral studies in radio astronomy. The purpose of the invention is to simplify the correlometer. The correlometer contains a shaper 1 character, a shift register 2, a synchronization unit 3, sign multipliers 4, triggers 5, and reversible counters 6. 1 Il.

Description

one

3

The invention relates to specialized computer facilities and is intended to calculate the autocorrelation function of a stationary random process in real time, in particular, in spectral studies in radio astronomy.

The purpose of the invention is to simplify the correlometer.

The drawing shows a correlometer diagram.

The correlometer contains formulas.

The 1 character, the 2 shift register, the synchronization unit 3, the sign multipliers 4, the triggers 5, and the reversible counters 6.

Each channel of the correlometer accumulates a value proportional to the sign correlation coefficient according to the equation

 (x2K-; x2K-)

K IL xsign X2lt-X4IUn).

The correlometer works as follows.

Shaper 1 forms the sign analogue of the input signal, with positive and negative signs being encoded by a logical one and zero, respectively. At the instants of an odd clock sync pulse, the process sign code is written to the first digit of the shift register 2. In this case, the previous codes are shifted by one bit. The sign multiplier 4 of each channel determines the products of the codes of the first and corresponding bits of the shift register 2.

When the codes coincide at the output of the multiplier, the counting signal for trigger 5 is generated, the trigger goes to state 1 in sync pulse. In the case of code mismatch, the resolution signal is not generated and the trigger 5 remains in its original state

OI. Upon the arrival of the next, even, sync pulse, the indicated operations are repeated for an even count of the process. In this case, three cases are possible: two coincidences of characters in even and odd cycles are successively

five

0

five

0

five

- five

0

five

Two signals mismatch occur - one coincidence and one mismatch - 1 or. Moreover, the zero output signal of the trigger 5, being fed to the input of the resolution of the reversible counter 6, permits, and a single prohibits the account on the clock pulse. The direction of counting is determined by the last of the works. After passing the clock pulse, trigger 5 is forcibly set to O. This completes the cycle of forming the next term according to the indicated equation.

Claims (1)

Invention Formula A multichannel correlometer containing a sign-shaper, whose input is an information input of a correlometer, shift register, synchronization unit and N analysis channels, each of which contains a sign multiplier and reversible counter, the first output of the synchronization unit connected to the clock inputs of the reversible counters, the second output unit synchronization is connected to the clock input of the shift register, the information input of which is connected to the output of the sign maker, in each channel the output of the sign multiplier is connected On the counting input of the reversible counter, the first input of the sign multiplier is connected to the output of the first digit of the shift register, the output of the reversible counter is the output of the corresponding channel of the correrelometer, characterized in that for the purpose of simplification, each channel contains a trigger, and the installation input is 1, a clock input, a setup input in O and a trigger output are connected respectively to the output of the sign multiplier of its channel, to the third output of the synchronization unit, to the fourth output of the synchronization unit and to the counting resolution input p versivnogo counter its channel, the second input of the sign multiplier i-th (i 1,. .., N) of the channel is connected to the output of the (i + 1) -ro bit of the shift register.