SU443327A1 - Device for measuring the average frequency of a burst - Google Patents

Description

The invention relates to the field of electrical measuring equipment, in particular, to devices for digitally measuring the average frequency of a bundle of pulses, for example, in radar, radio navigation.

A known device for measuring the average frequency of randomly distributed pulses, which can be used to measure the average frequency of a burst, contains two trigger counters, an additional trigger and an impulse generator.

However, the known device has insufficient measurement accuracy at a sufficiently short pack duration and its functionality is limited.

To improve measurement accuracy with a short burst duration, simultaneously receive a continuous signal frequency equal to the average pulse frequency in a burst and expand the functionality of the proposed device is equipped with two time selectors and two frequency dividers, the output of the pulse generator through serially connected first time selector and The first frequency divider is connected to the output of a 1-pulse counter, the second output of the generator is connected via a successively connected second second frequency divider and a second timing selector connected to the input of this counter, the second input of which

connected to the output of the control trigger, and the outputs of the latter are connected to the second inputs of the device's temporary selectors.

The drawing shows a block diagram of the described device, consisting of a pulse generator 1, a frequency divider 2, time selectors 3 and 4, an NMPU.alsov counter 5, a second frequency divider 6, an input 7 of the device, a control trigger 8 and a scaling circuit 9.

The output of the pulse generator 1 of a constant frequency is connected to the inputs of the first divider 2 and the first time selector 3. Frequency divider 2 has a division factor equal to L-1, where L is the number of pulses in the beginning. The output of divider 2 through time selector 4 and pulse counter 5 is connected to the control input of divider 6, the counting input of which is connected to the output of time selector 3. Input 7 of the device is connected to the single input of control trigger 8 directly through scaling circuit 9 with a scaling factor equal to L, to the zero input of the trigger 8. The single output of the trigger 8 is connected to the temporary selector 4, and the zero output to the temporary selector 3. Pulse counter 5, the zero input of the trigger 8 and scaling circuit 9 are connected, except for , To the input of the reset signal.

The device works as follows. Before starting work, the circuit receives a reset signal, which puts the pulse counter 5 and the scaling circuit 9 into the initial zero state. By the same signal, the control trigger 8 is transferred to the zero state, at which the time selector 4 is closed. In this case, the time selector 3 is in the open state and through it the input signal of the controlled divider 6 receives the signal Fi from the pulse generator 1. But the zero state of the pulse counter 5 corresponds to the maximum division factor of the frequency divider 6, so that the output signal of the device at the output divider 6 is absent for a long time.

The first nmnul of the packet arriving at input 7 throws trigger 8 into a single state, at which time selector 4 opens and time selector 3 closes. Through the open selector 4 to the input of the counter of pulses 5, the pulses from the output of divider 2 pass;

 . Time selector 4 will open until

as long as the input 7 does not receive all A pulses of the filling. With nostuplepin at input 7, and therefore, at the input of unresponsive circuit 9 / V-ro impulse, circuit 9 overflows, impulse appears at its output, which acts on the zero input of control trigger 8 and converts it to the zero state. Thus, the time selector 4 was in the open state for a time interval T equal to the duration of the burst. If during the TI time, the device received L pulses with N-1 periods between them, then the average value of the pulse following period in the packet can be determined by outputting

Ti

wed

rn

N- 1

where the average frequency of the pulses in a packet is

R - Wed - -r- - - :: -

1- "Wed

Through open during the time T time selector 4 on the pulse counter 5

four

output

impulses come from

F whose frequency is equal to

N

Optionally, the number of Ni pulses, the nm counter of 5 pulses, is equal to

F, TI

N, - F, T, ::::

LA-1

The number of nm pulses NI, counted by pulse counter 5, is successively entered into divider 6, and by the time the trigger 8 transitions to the bullet state (by the time the time selector 3 opens) the division factor of divider 6 becomes equal to yVi. Through the open selector 3 pa delntel 6 postunay pulses with a frequency F, resulting in a frequency at the output of the device is equal to

R ". F (N-l)

F,

out

f, r, NI

which corresponds to the average frequency of pulses in the oven.

According to the state of the pulse counting, it is possible to directly determine the average frequency.

g

pulses in a pack, like -Г7 where

the number of nmnulsov counted counter.

Subject invention

A device for measuring the average frequency of the tube nmnulsov containing the generator nmnulsoz, controlling trigger

impulses and recalculation scheme, characterized in that, for the purpose of new measurement accuracy and extended functionality, it is equipped with two time selectors and two frequency dividers, the output of the pulse generator through the serially connected nerve temporal selector and nerve frequency divider connected to the output of the pulse counter The second output of the generator is connected through the second frequency delntel and the second time selector in series with the input of this counter, the second input of which is node It is connected to the output of the control trigger, and the outputs of the latter are connected to the second inputs.

time selectors.

CFPOC