SU507826A2 - The discriminator of the delay of the envelope and phase carrier - Google Patents

Description

(54) DISCRIMINATOR OF DELAYING ENRICHMENT AND PHASE

Bear

but to the input of the evaluation unit of the synchronization signal 12.

In the second cycle, the outputs of mixers 5 and 6 are connected respectively to the inputs of narrow-band filters 7 and 8, and the output of the phase detector 9 via the inverter 21 to the input of the synchronization signal evaluation unit 12.

The device works as follows.

The evaluation signals from the output of the balanced multiplier 1 through the amplifiers 3 and 4 of the intermediate frequencies are fed to mixers 5 and 6, to the inputs of which the output signal is simultaneously output from the balanced modulator 14

Sin (AOD -a A "5-ftg.) Where 1Oo-hh is the difference between the reference and g intermediate frequencies; dF} 1% m - estimation error of the 1st signal of the carrier signal; dT (error estimate of the phase of the synchronization signal; go th 4 is an error according to the frequency of tracking the Doppler sigin () t where it goes to the phase comparator 11. The low frequency constituted the output signal (multiplier) detector - V

In the second cycle, the current phase of the signal at the output of the double intermediate frequency filter 1O does not change, and at the output

v -e A t-26 -,., - ..

and at the output of the inverter 2

77.g.1

dH, ELL s-L-2 5H s-th of the first switching frequency is chosen so that during each cycle, from one

Sin ("; c - ftg) Sin ((a) ot F)" u, ftg.) 4% - VQ Siix (aUo-4Uc-ftg.,

U) c

Where

- synchronization frequency; ft

.-Q is the estimate of the Doppler shift of the synchronization frequency;

And - assessment of the current phase of the synchronization signal; o is the frequency of the reference signal; - the initial phase of the reference

signal.

As a result of multiplication on mixers 5 and 6 in the first cycle, the signal 2Д 30 is output from the narrowband filter 7

Section 9, the control unit of the evaluation of the synchronization signal 12, is proportional to the phase difference of these signals

, -uf -u1 - / i 20 phase detector 9 selects the low frequency component of the signal proportional to the phase difference

the sides managed to set oscillations in either narrowband filters 7 and 8, a. spurious phase shift These signals are sent to (multiplex signals in narrowband 35 leak) phase detector 9, the output of the filters 7 and 8, which the filter doubles the intermediate phase shift of the signal in phase frequency Yu, generates a signal of the rotator 20 type. SiTi; euWn-2 (S-ftg) t-2 & Vj,., Q, synchronous frequency. . organizations; - LL o gj fj Si error in the frequency of tracking the Doppler shift of the carrier frequency. At the output of the narrowband filter 8, the signal I is extracted.

On the other hand, the component of the control signal of the phase detector 9, which corresponds to the switching frequency, was compressed in the evaluation of the synchronization signal 12.

At these times, the averaged signal is proportional to:

-1) (2) l. L.

lm: -., v - es-ftg-ct c

It follows that in the synchronization mode, when the phase difference tends to zero, the phase estimate of the synchronization signal in the synchronization signal evaluation unit 12 is almost independent of the normal errors caused by the non-identity and instability of the phase characteristics of narrowband filters 7 and 8, as well as the instability of the zero phase detector 9.

Claims (1)

Thus, when the operating point of the phase detector 9 is located in the linear A4 g, the controlled phase shifter 20 changes the phase shift so that, thereby, the operating point of the phase detector is kept in the vicinity of the zero mismatches. Thus, the device makes it possible to significantly improve the accuracy of estimating the phase of the synchronization signal due to the interference of normal errors and reducing the likelihood of abnormal errors at the output of the synchronization signal evaluation unit 12. Invention discriminator of the envelope and carrier phase of auth. St. No. 416818, The phase response area of the normal phase error of the synchronization signal HP depends on the parasitic mixing of the operating point. Relatively zero position. However, to minimize the likelihood of abnormal errors in an integer number of periods of the synchronization frequency caused by jumps in the operating point of the phase detector due to the input phase noise, it is necessary to keep the operating point of the phase detector in the zero error area. This is achieved by a controlled phase shifter 20, equalizing the phase characteristic of the narrowband filter 8 relative to the filter 7. In this case, a low-frequency component of the output signal of the phase detector 9, separated by a low-frequency filter 22 .V, characterized in that, to increase the accuracy of the device, is used as the control signal of the phase detector 9. It has three switches, a phase shifter, a low-pass filter and an inverter, and the output of the reference frequency block is connected to the control inputs of the switches, two of which are connected between the mixers and the narrow-band fuses trami, and a third input connected to the synchronization signal evaluation unit, wherein the output peremnozhitep soednne) with the third switch inputs, an inverter and low pass filter whose output is connected to the controllable input of phase shifter connected between the second switch and the narrowband filter.