SU1314453A1 - Automatic frequency control device - Google Patents

Abstract

The invention relates to a technique for measuring parameters of radio signals. The purpose of the invention is to increase accuracy. The device contains 1 and 9 low-pass filters, tunable oscillators 2, 5 and 12, frequency converters 3, 6 and 13, frequency detectors 4, 7 and 14, subtractive blocks 8 and 11, adders 10 and 15. 1 sludge. i (L CZ

Description

1 1314A53

The invention relates to measurements of parameters of radio signals and can be used to measure the speed and other characteristics of objects when the signal received from them contains side components.

The purpose of the invention is to increase accuracy.

The drawing shows a structural electrical circuit of a frequency locked loop device.

The device contains the first low-pass filter 1, the first tunable 10

At the output of converters 6 and 13, there are signals whose frequencies are equal, respectively, to CoPr + ioP + LP and OPD + iC ") a-th, where P $ 2-O. is an error in measuring the frequency fl. In this case, the outputs of the frequency detectors 7 and 14 produce voltages U-, and U, proportional to the tracking errors i SSP + iSl and QQq u Respectively. When summing in the second adder 15 U, UT and passing through the first filter 1, the voltage U is formed. (K ,,) uCOg, where K,, K, K are the frequency conversion factors

The second oscillator is 2, the first transducer detectors are 4, 7, and 14, respectively, the tel is 3 frequencies, the first frequency distortion This leads to an equivalent magnifier 4, the second tunable discriminator slope turns into an oscillator 5, the second transducer 6 (K (, 4) / K, times due to use of frequencies, second frequency detector 7, first subtractive unit 8, second low-pass filter 9, first adder 10, second subtractive unit 11, third tunable oscillator 12, third frequency converter 13, third frequency detector 14, the second adder 15.

The device operates as follows by wrapping additional energy in the side 20 components of the input signal spectrum, which in turn leads to an increase in the accuracy of the frequency adjustment in the device.

25 In addition, the tracking of the lateral component shift in the input signal spectrum allows to obtain at the output of the second filter 9 an estimate of the frequency О «S7. what is sometimes needed

at once.

At the input of the device receives a signal whose frequency in the first where Wo

"N (t)

near is equal

OiR "Oo + Wj (t) iQ,

carrier frequency; frequency shift due to Doppler effect;

fl is the frequency of the lateral components of the received signal, due to the speed of the wave of the reflective elements. In the converter 3, the frequency goes to the frequency range

C0 „p + 52 ,, de CO pr intermediate frequency;

i C0g (il-Od measurement error of the Doppler shift.

In the first frequency detector 4

An output signal, U, is generated, the second tunable oscillator, whose shape is proportional to the SMT. the second frequency converter, the second tunable second oscillator is the 5th frequency detector, the first calculates the output from the frequency block, the second filter of the lower right-hand side component of the frequencies and the first adder, successively Co0-Co0n + Op + (where R is the estimated 55 value of the connected second subtraction of the side signal components), and the block, the third tunable generator — the third tunable oscillator 12 — the torus, the third frequency converter — the signal with the frequency of the left side co-frequency and the third frequency detector, include Soc guide is - with "+ cOa-Q, chennye between the output of the second filter

g "

At the output of converters 6 and 13, there are signals whose frequencies are equal, respectively, to CoPr + ioP + LP and OPD + iC ") a-th, where P $ 2-O. is an error in measuring the frequency fl. In this case, the outputs of the frequency detectors 7 and 14 produce voltages U-, and U, proportional to the tracking errors i SSP + iSl and QQq u Respectively. When summing in the second adder 15 U, UT and passing through the first filter 1, the voltage U is formed. (K ,,) uCOg, where K,, K, K are the frequency conversion factors

 detectors 4, 7 and 14, respectively. This leads to an equivalent increase in the discriminator's slope by (K (, 4) / K, times due to the use of

The additional energy of the side 20 components of the input signal spectrum, which in turn leads to an increase in the accuracy of the frequency control in the device.

 detectors 4, 7 and 14, respectively. This leads to an equivalent increase in the discriminator's slope by (K (, 4) / K, times due to the use of

40

25 In addition, the tracking of the lateral component shift in the input signal spectrum allows to obtain at the output of the second filter 9 an estimate of the frequency О «S7. what is sometimes needed

30 for a variety of applications. Indeed, the output of the first subtraction unit 8 has a voltage proportional to the value of and. 51: Ug and 4-C (K7-K), which allows for

3 output of the second filter 9 to have the value P.

Claims (1)

Invention Formula A frequency auto-tuning device containing connected sequences The first low pass filter, the first tunable oscillator, the first frequency converter, the second input of which is the device input, and the first frequency detector, characterized in that, in order to increase the accuracy, ring-connected 313144534 the lower frequencies and the second input of the first-low frequencies, and the outputs of the first, the second and third frequency detectors of the second and third transducers are connected respectively to the perteles of the frequency connected to the input by the device, the second and third inputs of the secondary, the second inputs of the first total adder, the output of which of the submator and the second subtraction unit the input of the first filter is lower connected to the output of the first filter frequencies.