SU752752A1 - Signal-to-noise ratio adaptive phase meter - Google Patents

Description

one

This multi-phase phase meter with adaptation to the signal-to-noise ratio is intended for use in radio engineering systems operating under changing conditions, its signal-to-noise ratio.

Multiscale phase angle and signal meters are known, containing, not a synchronizer, modulator, measurement frequency generators, a receiver and phase scale meters connected by reference inputs to the outputs of measurement frequency generators 1. This meter has a large (2), but constant number of measurement scales phases, corresponding to the corresponding, and its motion parameter.

With fading, deliberate and accidental electromagnetic interference, it deteriorates, their signal-to-noise ratio and phase angle accuracy or lag accuracy, with partial equipment failure and other effects, significantly decrease; their signal-to-noise ratio, this multi-scale phase meter sharply degrades measurement accuracy ( the enhanced threshold effect) or generally becomes unable to measure a parameter at a given observation time.

The aim of the invention is to improve the measurement accuracy.

The goal is achieved by the fact that a phase meter containing a synchronizer, a modulator, measuring frequency generators, a receiver and scale phase meters, connected by reference inputs to the outputs of measuring frequency generators, additionally introduced measuring frequency band filters with variable bandwidth

10 phase meters, a switch of variable dimensional intervals, connected by inputs to measurement frequency generators and a synchronizer, and outputs to a modulator, a switch of received measurement intervals, inputs connected to a receiver and a synchronizer, and outputs to filters of measuring frequencies, a signal-to-noise ratio meter and the decoder of the signal-to-noise ratio levels, connected by the input to the signal-to-noise meter, and the outputs to the switches of variable and valid measuring intervals and to the control inputs of filters measure nyh frequency variable-transmittance polo25 soi.

Functional diagram of the device shown in the drawing.

A multiscale phase meter with adaptation to the signal-to-noise ratio contains 30 synchronizer 1, modulator 2, measuring frequency generator, iriemik 4, phase meter 5i-5, measuring frequency filters with varying transmittance depending on the signal-to-noise ratio, switchable measuring intervals 7, the switch of the measuring intervals taken 8, the signal-to-noise ratio meter (q) 9 and the decoder 10 levels of the current signal-to-noise ratio (e).

The device works as follows.

Let a high-precision multi-probe meter contain an EYE of Pmax 5 scales.

With l 5, the a priori accuracy from a priori to the a posteriori measurement efficiency

A °

equals 7-10. With fading q, the measurement efficiency drops to Ai 70. If you switch the meter in 4-scale modes, the efficiency will increase. If q decreases to 7, then A decreases to A2 5.4. If, at the same time, the meter is switched to the 3-scale mode, then A can be increased at the same q 7 to I. At q 5 A it will decrease to 1.5. Then the optimal number of Yaz 2 scales, at which A can be increased to 8. It is advisable to carry out the number of scales according to the program

, n 5; y (8.5; 10), / g: 4; E (7; 8.5); K (5.7); n 2.

The switch of the number of scales depending on q is made as follows. The sigam / noise ratio q is measured by the meter 9 and the output of the filter 6i of the coarse (1st) scale. The decoder 10 generates a pulse (or potential) and the switch of the measured dimensional intervals 7 and the switch of the measured dimensional intervals 8 to form a measured and output

T scales according to the law TI -, (where i is a number

scales for a given q, T is the total available measurable interval. In addition, the level q decoder switches the corresponding Ti bandwidth of the filters 6. Switches 7 and 8, depending on q, turn off the exact scales.

Thus, when the signal was frozen, before the prototye, it was practically not able to give an estimate even with ruble accuracy (at q 7, at, A, only 5.4). The meter in the case of non-existence of a complication of the IoSvAm NOA-P scheme to increase the accuracy of the measurement of AO for the IRI (, x 2 times at (7 7,

Lou

5.33 times at q 5. Rude but

at

l

The ability to more accurately estimate an object's motion parameter with the same meter can be useful for any emergency, unintended situation associated with deep sial / noise fading, or under radio-electronic countermeasures. In the latter case, the estimation accuracy can be increased by increasing the number of estimates.

in the secondary processing of measurement results.

Claims (1)

Invention Formula Phase meter with adaptation to otisheiiyu sigial / noise, containing a synchronizer, modulator, measurement frequency generators, a receiver and phase scale meters, connected by reference inputs to the outputs of measurement frequency generators, characterized in that, in order to improve the measurement accuracy, measuring filters are added to it frequency band with a variable bandwidth, connected by outputs to the corresponding phase meters, a switch of variable dimensional intervals, connected by inputs to measurement frequency generators and inhronizatoru and outputs - to the modulator, the switch received dimensional intervals inputs connected to the receiver and siihronizatoru and outputs - to filters measurement frequencies, measuring the signal / noise ratio and the signal level decoder / the noise connected by the input to the signal-to-noise signal meter, and the outputs to the switches of variable and received measuring intervals and to the control inputs of filters of measuring frequencies with variable bandwidth. Sources of information taken into account in the examination 1. Accuracy of measurement of the parameters of the movement of space aiarats. Ed. Silvestrova, S.D. “Soviet Radio, 1970, p. 101.