SU868611A1 - Multi-range device for measuring frequency - Google Patents

Description

one

This invention relates to a radio metering technique and can be used in radio receivers of radar stations and frequency meters, as well as in receivers of passive radar stations.

Devices are known that solve a similar problem, containing a mixer, a dispersion filter and a synchronizer that controls the frequency-modulated local oscillator and indicator. In addition, in order to increase the signal-to-noise ratio and to increase the frequency resolution, it is equipped with a recirculator connected to the output of the dispersion filter, with the transducer delay line connected to the synchronizer feedback circuit til

Lack of devices - low / speed.

Of the known devices, the device closest to that proposed by the technical essence is the device containing a series-connected reference frequency generator, a mixer, a narrowband filter with a detector, a control key connected by one control input with a radio receiver output, and a pulse counter with

a reset wire connected to the frequency tuning device of the radio receiver, as well as a device comparing the instantaneous frequency of the local oscillator of the radio receiver to the reference, which is connected to another control input of the controlled call, as well as frame memory blocks for each frequency range and switch,

10 information inputs of which are connected to the outputs of the memory blocks of the codes, the control input of the switch is connected to the synchronizer of the range carrier switch

15 panoramic receiver, and the output of the switch is connected to the reset unit and the initial installation of the counter G2.

The lack of known devices is low speed.

20

The purpose of the invention is to increase the speed of the device.

The goal is achieved by the fact that in a multiband frequency measurement device containing

25 frequency filter, the outputs of which are connected to the inputs of the n frequency converters, the outputs of the latter through the n detectors, connect to the first inputs of the n controlled keys, the second

30 inputs which are connected to the outputs

n memory blocks, serially connected high-frequency switch, spectrum analyzer and decision unit, as well as a decoder, n delay blocks and n OR elements, whose outputs are connected to the third inputs of n controlled keys, the outputs of the latter connected to the second input of the decision unit and to the input the decoder, the output of which is connected to the first input of the high-frequency switch, the second inputs of the latter are connected to the outputs of the n delay blocks, the inputs of which are connected to the outputs of the n converters, and the outputs of the n detectors with Connected to the p-1 inputs of the elements OR.

The drawing shows the block diagram of the device.

The device contains a frequency filter 1, n frequency converters 2, n detectors 3, n memory blocks 4 and key controls 5, a high frequency switch 6, n delay blocks 7, a decoder 8, a spectrum analyzer. 9, decisive block 10, and n elements OR 11.

The device works as follows.

The frequency filter divides the entire measured frequency band into a range that, with the help of converters, is transferred to the working frequency range of the spectrum analyzer 9. Depending on the frequency mismatch, the signal enters one of the frequency ranges at the input of the detector 3. The detected signal opens the control key 5 of the corresponding range and through the elements OR 11 closes all the rest of the keys to be controlled. As a result, the corresponding memory block 4 is connected to the decoder 8 and one of the inputs to the resolution of block 10, the decoder 8 converts the binary code of the range number to decimal. Under the action of the range number code, the high-frequency switch b connects to the input of the spectrum analyzer 9 the frequency range in which the signal appears. To compensate for the response time of the high-frequency switch b, delay blocks 7, i.e. the signal is delayed by the time required to connect the high frequency range to the input of the spectrum analyzer 9. The signal delay in J and x delay is determined from the equality

  + t,

where Cf is the duration of the radio pulse front;

  response time of the controlled key)

1du .. - time of operation of the device;

t ,, is the response time of the high-frequency switch.

. in real cases to, can be from 3 to 5 ISS.

Spectrum analyzer 9 instantaneously measures the value of the carrier frequency of the signal within its working range and, in binary code, outputs to the decision block 10, which calculates the true value of the carrier frequency of the signal using the formula

f with ca + f vn-in

where f is the frequency of the signal measured by the spectrum analyzer 9;

i is the number of the frequency range in which the signal appears;

 lower limit of the measured frequency band of the device The time required to determine the true value of the signal carrier frequency characterizes the speed and throughput of the entire device and is equal to

t, + t sd. + tpv, 1

where is the value of the time delay of the signal in the delay line

 - measurement time

carrier frequency in the spectrum analyzer and, pass it into a binary code;

tfy - time required for

calculating the true value of the carrier frequency of the signal in the resolver

As can be seen from the formula, the time required to measure the signal frequency does not depend on the number of frequency ranges n. Consequently,

The time gain in determining the frequency of this device as compared with the known will be the greater, the greater the number of frequency ranges the device has, i.e. than

wider band of measured frequencies.

Claims (2)

1. USSR author's certificate No. 443326 ,. cl. G 01 R 23/00, 25.12,72. 2. USSR author's certificate №573767, cl. 6 01 R 23/10, 12.04.76.