SU490039A1 - Digital device for measuring the phase of the signal - Google Patents

Description

one

The invention relates to a radio technique, in particular, to a technique for measuring the phase of a signal against noise.

A device for the optimal measurement of the phase of a signal is known, which contains a no-band filter, an analog converter, delay elements accumulating adders, trigonometric transducers of sine, cosine and arc tangent functions, and generators of arguments and amplitudes.

A disadvantage of the known device is that the frequency of the expected signal is required to measure the phase of the signal. Due to inaccurate knowledge of the frequency of the expected signal, an additional component of the phase measurement error appears. However, in general, in practical cases, the frequency of the received signal turns out to be different from that emitted due to many factors (Doppler effect, fluctuation of reference oscillators, etc.).

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

The goal is achieved due to the fact that the device is equipped with four electronic keys, two additional delay elements, two additional accumulating adders, two registers, two subtraction units, an additional multiplication unit and a control unit, while the oo output of the phase meter multiplier with digital filtering is connected respectively, through a series-connected nerve electronic key and an additional accumulating adder with one of the inputs of the ratio measurement block the digital phase filter and through the second electronic key and the second accumulating adder with its second input and in parallel to the same inputs of the calculating unit are connected the outputs of the two accumulating adders of the phase meter with digital filtering, respectively, through additional delay elements, the output of the arc tangent of the arc tangent function is connected the two inputs of the first subtraction unit through the tertiary electronic key and the first register connected in series and, respectively, through the fourth The second electronic key and the second register, the second inputs of all four electronic valves are connected to the four outputs of the control unit, and its fifth output is connected to the single input of the additional multiplication unit, the second input of which is connected to the output of the first subtraction unit, the output of the additional multiplication unit is connected to one from the inputs of the second subtraction unit, and BTOpoii, its output is connected to one of the inputs of the first multiplication unit.

0

Flowcharts

The device consists of measurements i f: 1, digital filtering, containing pslsovy filter 2, pressbreaker 3 analogue-digit, el; ety 4, 5 delays, dspo; ; gte t; delayed terminals, 7 delayed, faded 8 y: v-: K-;: e nor, trioiometrically prisc br:; zs:; ate; m, sine functions, trigoiometer;: check: pso3p: zozatsl 10 fcikpi KccpiEiyc, amilitud, generator 12 Zayush, sumuator i3, 14, and t: in contains dnpoln; bodies: yo i sug mator 15, 16,, lsrtrl: s; klk; - :: 17 19, 20, unit 21 for calculating ogiopeic G ;, r: -,: itometric converter 22 of Duikplp arctangent, registers 23,: -M, blocks 5, subtracting difference fG, unit 27 of uiralation, up to complement block 28 of multiplication .

The device works SL-go,; m) zg; l :.

The input signal / (G | cos c.eg-j f (O g F where the pho is the initial phase to be measured, is passed through a band-pass ph | ıltr 2 and encoded using the converter 3 analog-digit into discrete timey intervals with an interval D. For each fe-ro moment of encoding the input signal in the generator of 12 arguments is formed by the increase of se / gDg +, where co is the expected signal frequency, (/) is the expected phase value, determined by the law of its phase modulation in m / y, e. 12 arguments are produced from control block 27. Signal, forming employed in the inverter 9, neremnozha Referring; i The multiplication unit with the value of / z-th sampling -nala removed, as well as the signal amplitude value (, formnruemoy amplitudes generator 11 forms the output value multiplying unit

X, k - N gm and ML sin 1-: M, ..

After issuing the value to the accumulator adders 13, 15, in the multiplication block, the value is calculated

2 k N and kM cos -f with;

.

the signal function cos (co / eAt-i- | yf / d) is formed in the trigonometric converter 10, and the time selection of the L / eAif code and the signal function is produced in delay elements 4, 5. The delay time of the elements 4, 5 is determined d, by multiplying the operation of block 8. Umiozii.I zaachenie postavuet nachalivayuschie adders 13 and 14. The moments of termination of the coil in the adders 13, 14 and 15, 16 are different, and are set by caching the inputs 15 and 16 electronic keys 17 to 18, which are produced from block 27 controls

In accumulating adders, greatness values are formed.

L, B „L„, 8 „,

I I

m

/one,

h-A k and B., V X., k.

k-: lЛ -1

The number of selections MI and M: is determined by the interval} (full: i and for a signal, for M, - corresponds to the tip tips TI, and M-, - 7%. From the output of su: 1, the weight is 15 and 16 Lnost finds on the base 91, vomnlen. G;: e sormormir,

 - ig (pv then in trigoumstry99

Value

four,

cp9 through the electronic key 20 is entered in the register 24. With for; the time required for the calculation of the ratio, which is made D01; 1nte; by many elements 6 and 7 of the delay, similar operations

AT,

And the result is F1 arctg --- for I

carried in register 23. The values of the values of F1 and pho;) are eaten as

. - „, D-Ug

  About 7, GS - th 1-

r; i, e fo is the initial phase of the signal, AOJ is the quantity that is on / difference due to the difference between oi, iariiGu and the frequency of the signal. In hierUO; -; Blochchs 25 is subtracted; the calculation of the magnitude of Af cf, i - f2 is made. The value of AF, y; anozhs n addition: teliom block 28 cleverly lyT,

marry, -, oorazat at the exit,

Ai 2

which enters the second block 26 will deduct

nn green --- const post

runaway from block 2 / control. In the second b; () ke 20 subtraction

 and its output

G1 redeme of the invention

A digital device for measuring the phase of the detector, containing a phase meter with digital filtering, is intended for newer measurement accuracy, it is equipped with four electronic keys, l, a number of additional delay elements, dzu:; don.appactor and adder accumulators, two registers, two subtraction units, an additional admonition unit and a control unit, and this causes both outputs of the phase meter multiplier unit to be connected to the centimeter filtering

respectively, through the first connected electronic key and additional accumulator, an adder with one of the inputs of the calculator for the phase meter with digital filtering and a second electronic key and a second accumulating adder with its second input and in parallel with the same inputs for the calculator, the two accumulators are connected, their adders phase meter with digital filtering, respectively, through additional delay elements, the output of the trigonometric converter functions arctangent is connected to two inputs of the first subtraction unit through a third electronic key and a first register connected in series and a fourth electronic key and a second register, respectively, the second inputs of all four electronic clamps are connected to four outputs of the control unit, and the fifth output is connected to one additional input the multiplier unit, the second input of which is connected to the output of the first subtraction unit, the output of the additional multiplication unit is connected to one of the inputs of the second subtraction unit, and its second input is connected to one of the inputs of the first multiplication unit.