SU444194A1 - Multi-channel polar correlator - Google Patents

Description

(54) MULTICHANNEL POLAR CORRELATOR

The invention relates to specialized computing devices designed to determine the correlation functions of random processes. The well-known multi-channel polar correlator, which contains a ring distributor, key circuits, AND circuits, triggers and limiting amplifier, is simple in circuit design, convenient and reliable. However, it is inherent in the errors that occur due to the first performance. auxiliary trigger of a false signal, determined by the polarity of the input signal in the previous cycle, in the absence of a signal at the input of the correlator at the time of the first ring of the distributor in the subsequent cycle. In determining the normalized correlation function of a random process, the probability of coincidence of the signs of only one polarity (negative) is used. The aim of the invention is to reduce the analysis time. This is achieved by introducing the third and {fourth triggers and the additional key scheme, the second scheme AND, and the zero setting block. The block diagram of the proposed correlator is shown in the drawing, where the following symbols are accepted: 1 — ring distributor; 2 - 2 triggers ring distributor; 3 and 4 - the first and second auxiliary triggers of the first group; 3 „and 4 the first and second auxiliary triggers of the second group; 5 - 5 - key schemas 2 ft we (keys) of the first group; 5 and 5, the first and second keys of the second group; 6, 7 - diodes; 8 - limiting amplifier; 9 and 9 - the first and second logical schemes Yu - Yu. - pulse counters; 11 - clock pulse generator; 12 is the setup diagram of the first auxiliary trigger zero, 13 and 14 are the OR circuit. in the multichannel polar correlator, htho-i re input through limiting amplifier 8 is connected to the inputs of key circuits 5 and 5. The control input of the switch 5 is connected to the output of the first trigger 2 of the ring distributor 1, and the control input of the switch 5 through diodes 6 and 7 - with the outputs of the clock pulse generator 11. The output of the key 5 is connected to the inputs of the first triggers 3 -. and 3, and the output of the L-l cha 5 - with the inputs of the second triggers 4 and 4. The outputs of the triggers 3 and 4 connect2 .t ::: t ..; :::.: G :: „. 1.and | 77 are connected to the inputs of the logic gate, and the outputs of flip-flops 3 and 4 are connected to the inputs of the logic circuit AND 9 — the output of logic circuits AND 9 are connected to the inputs of a group of channel key circuits 5-5, the control inputs of which have the outputs cells 2. - 2 ring distributors 1, The output of each key circuit 5 - 5 is connected to the input of the corresponding pulse counter Yu - 1O, and the input of the first pulse counter Yu - through diodes 13 and 14 is connected to the outputs of the first triggers 3 3, the inputs of which through the circuit 12 zero settings are connected to the output of the last one ki 2 ring distributor 1. Mpogokana 1 polar correlator works as follows. At the beginning of each cycle of operation of the ring distributor 1, both the first triggers 3 Q are set to the O circuit of the setup 12, which generates the pulses from the predetermined front of the output pulse of the last cell, they are set to the O position, i.e. the OI signal passing through amplifier-limiter 8 through the open circuit 5 is fed to the inputs of the first flip-flops 3, and 3. It can be accepted that when the input signal is negative the output of the flip-flop 3 occurs 1, and at the output of the flip-flop 3 O, and with a positive polarity the output signal at the trigger output. O remains, and at the output of the trigger 3 "occurs 1. When to the left | tion of each clock pulse at the output | The key d of the generator 11 opens the key 5 gp. j through which the input signal passed through the amplifier-limiter 7, is fed to the inputs of the second trigger 4 And 4. When the input signal has a negative polarity, 1 is generated at the output of trigger 4, and 0 is output at 4, and 0 is left at positive polarity, and 1 is output at the output of trigger 4. Signals from the trigger output h. and 4 of the first group is fed to the inputs of the first circuit AND 9, I AC of the outputs of the flip-flops 3 and 4 of the second Z group are fed to the inputs of the second logic circuit AND 9. The voltage pulse at the output of the circuit 9.j or circuit 9 only occurs if both inputs, i.e., either from triggers 3 i J-1 or from triggers 3 and 4, comes 1. In other words, when the polarity of the input signal at the moment of triggering the first trigger 3 (G) and at the time of the run-up of the second trigger 4 Q) coincides. The voltage pulse from the output of the circuit AND 9 or 9 through one of the public keys 5-5 passes to the corresponding pulse counter, where it is recorded. Suppose that at the moment of appearance of a pulse in the first cell of trigger 2 of the annular expansion, „1 of limiter 1, the input signal has a negative polarity. Then, the input signal, having passed through the limiting amplifier 8 and the open circuit 5, will transfer the trigger 3 to such a state that it turns on its way (the output of the trigger 3 remains O). When the next clock pulse arrives after a delay time equal to the pulse duration at the output of the triggers of the ring distributor 1, circuit 5 opens with this clock pulse and circuit 5 with a pulse from the output of the second trigger 2 of the ring distributor 1. Through the open circuit 5, the input signal will go to the inputs second triggers 4 and 1 2. Depending on the current input signal 1

time at the output of the second trigger 4 |

The first group is either O or. If the trigger output4 occurs,

Then, at both inputs of the circuit I 9, there comes t 1, which will cause the appearance of a voltage pulse at its output. This voltage pulse through the open key circuit 5 will go to the pulse counter 10.

where it will be fixed. When appearing

The next clock pulse after double the delay time from the moment the trigger 3 is triggered opens

circuit 5 "- and a pulse from the output of the third trigger 2 of the ring distributor l 1 will open circuit 5. Through the open

This circuit 5 input signal is fed to the input of the second trigger 4 and translates

its state corresponding to the polarity of the input signal. On the first input of the first logic circuit And 9 from the output of the first trigger 3 will go 1,

and the second input is either 1 or O. The output signal of the first circuit is AND 9

through the open 5. will go to

about

impulse counter Yu, etc.

With the subsequent appearance of clock

impulses and triggering of the collet distributor cells at the output of the first logic circuit 9, when the above conditions are met, voltage pulses occur, which through the corresponding open circuit arrive at the corresponding pulse counter and t, e.

Throughout this cycle of operation, the distributor O-ring 1 at the output of the second logic circuit And 9: signal

is absent regardless of the state of the second trigger 4 of the second group, so

as a signal at its first input, i.e. from the output of the first trigger 8, the second

group, is equal to O. If during the operation of the first cell 2 of the ring

distributor 1 input has

positive polarity, then during the whole cycle triggers work 3

"

The second group determines the coincidence of the signs of the positive-polarity signals and the inputs of the pulse counters 1 -1.

voltage pulses come already from the output of the second logic circuit 9.

If during the operation of the first cell 2 of the ring distributor 1, the input signal is zero, then during the whole subsequent cycle of operation of the ring distributor 1 there are no signals at the outputs of both logic circuits 9 and 9, since the first triggers 3

and 3 are in the initial zero state, which is provided by the zero setting circuit 12 after the termination of each

cycle of operation of the ring distributor, I The first pulse counter 1O counted-1

Only the work cycles of the correlator, i.e., counts the total number of samples, since its input is connected to the outputs of the first triggers 3 3.

After the time required for the determination of the sign correlation function to expire, samples are taken from the pulse counters and the probabilities of coincidence of the signs are determined as the ratio of the number recorded in the corresponding counter to the number recorded in the first one. The normalized correlation function of a random process is determined by the probability p (+) as a function of the delay: |

p (T) -cos 25Gy (4)

The number of determined ordinates of the normalized correlation function corresponds to the number of cells in the ring distributor, and the discrete values of the arguments are multiples of the clock pulse generator. It is necessary to note the possibility and simplicity of changing the correlation interval by changing the frequency of the clock pulse generator and the number of definable ordinates: the correlation function by changing the number of cells in the ring I distributor, and introducing the likelihood, falling signs of both polarities material4 improves accuracy and shortens the analysis time of random processes.

Subject invention

A multichannel polar correlator containing an annular distributor connected by outputs to control inputs of a group of key circuits connected to counters, an amplifier limiting device connected via a key circuit, and a first trigger with circuit I, a second trigger connected to a key j

I circuit, characterized in that, in order to shorten the analysis time, it contains the OR circuit, the third and fourth triggers, an additional key circuit connected to the single and zero inputs of the third and fourth triggers, respectively,

connected by the inputs to the second and fourth triggers, the zero setting circuit connected to the output of the last cell of the ring distributor and to the installation inputs of the first and second triggers, the outputs of which are connected through the OR circuit to the input of the first counter.