SU1532883A1 - Device for measuring phase of intermittent radio signal - Google Patents

Abstract

The invention relates to radio engineering, in particular to radio measurements, and can be used to measure the phase of a discontinuous radio signal, the interruption law of which can be irregular, unknown at the receiving point. The aim of the invention is to improve the accuracy of measuring the phase of a discontinuous radio signal, the interruption law of which may be irregular, which is achieved as a result of using additional information about the presence of a useful signal in the input implementation. The device contains multipliers 1 and 6, amplifiers 2,9,16 and 18, integrating circuit 3, threshold unit 4, switches 5 and 17, adders 7 and 13, integrators 8 and 14, phase modulator 10, reference generator 11, block 12 constants, quadrant 15. The device allows to increase the accuracy of processing intermittent signals in conditions where the law of interruption can be random in nature, unknown at the point of reception. 1 il.

Description

The invention relates to the field of radio engineering, in particular, to radio measurements, and can be used to measure the phase of a discontinuous radio signal, the interruption law of which may be irregular, unknown at the receiving point.

The aim of the invention is to improve the accuracy of measuring the phase of a discontinuous radio signal, the interruption law of which may be irregular, unknown at the receiving point, by using additional information about the presence of the useful signal in the input realization. The drawing shows a functional diagram of a device for measuring the phase of a discontinuous radio signal.

The device for measuring the phase of the interrupt of the radio signal contains the first multiplier 1, the first amplifier 2, the integrating RC circuit 3, the threshold block 4, the first switch 5, the second multiplier 6, the first adder 7 and the first integrator 8, the output of the latter through the second amplifier 9 is connected in series with the second input of the first adder 7 and is the output of the device. The first input of the first multiplier 1 is the input of the device. The output of the first integrator 8 through the phase modulator 10 is connected to the second input of the first multiplier 1, the second input of the phase modulator 10 is connected to the output of the reference generator 11, the device also includes the serially connected constant block 12, the second adder 13, the second integrator 14, quad 15, fourth amplifier 16 and second switch 17, the output of which is connected to the second input of the second accumulator J3 "The output of the second integrator 14 is connected to the second input of the second multiplier 6 and through the third amplifier 18 to the third input of the second sou Matora 13, the first output amplifier 2 is connected to the main input of the first switch 5. The second output of block 12 is connected to the constants porgovogo second input unit 4, the output of which is connected to the control input 17 vtorog key.

The adders 7 and 13 serve to add signals that simultaneously arrive at the inputs of these nodes and do not contain memory elements. Reference Generator 11 is the source

sine wave signal of the same frequency as the frequency of the input radio signal. The threshold unit 4 is a comparison circuit, at one input of which the voltage is supplied from the output of the integrating RC circuit 3, to the other - the voltage from the second output of the constant block 12. Constant block 12 is a source of two constant voltages. The voltage 1C at the first output of block 4 is proportional to the spectral density Ngg, which characterizes the dispersion of the phase shift created by the useful modulation and is included in the expression for the dispersion and filtering error:

Q 5

0 5 Q „45 5

five

dec

one

Jac,

dt2 NЈE etf Ы0

where N is the spectral density of the additive white noise; T is the integration constant in the dispersion measurement channel; AC, the signal amplitude is known; J, (t) is a function defining the law of signal interruption.

The voltage at the second output of block 4 is the threshold with which the signal is compared when it is detected and which is determined based on a given detection criterion (when using, for example, the Neumann-Pearson criterion, the threshold U2 is determined by a given false alarm probability, gi) i

The phase measurement device operates as follows.

Before the arrival of the radio signal, the device is reset, for which the integrator 8 and 14 channels of the meter and the integrating RC circuit of the three detector channel integrate with the Reset signal fed to the control inputs, and the outputs of the reference generator 11 and the constant block 12 are set corresponding signals. In this case, the evaluation of the discontinuous radio signal phase is generated at the output of the integrator 8, which is part of a meter operating on the principle of the FALCH tracking system and monitors the phase fluctuation of the radio signal at the input of the device in a mixture with noise. Unlike the prototype, in which the operation of the keys is controlled in accordance with the regular signal interruption mechanism, this device is supplemented with a detection unit using the correlation processing principle. It consists of a multiplier 1 using a phase-adjusted reference signal, an amplifier 2, and an integrating circuit 3, the output of which produces a voltage proportional to the statistics of the detection of the input radio signal. The voltage from the output of the integrating circuit 3 is supplied to the threshold unit 4, in which it is compared with the threshold determined in accordance with the specified detection criterion and the corresponding voltage on the second output of the constant block 12. The result of the comparison, which is a sequence of ones or zeros, is fed to the control inputs of the keys 5 and 17 in accordance with a predetermined algorithm of the device operation. Thus, the involvement of additional information on the presence or absence of intermittent

radio signal in the input implementation of the AB-25 which is connected to the second input

hence the first multiplier, the first amplifier, the first key, the second multiplier, the first adder and the first integrator, the reference oscillator, the phase modulator, the second amplifier, the third amplifier, as well as the serially connected constant block, the second adder,

the second integrator, quad, fourth amplifier and second key, and the output of the first integrator through the second amplifier is connected to the second input of the first adder, as well as

5 is the input of the phase modulator and is the output of the device, the output of the second integrator is connected to the input of the second multiplier, as well as to the input of the third amplifier, the output of which is connected to the second input of the second adder, the third input of which is connected to the output of the second key. generator connected to the second input of the phase modulator, the output

It processes processing and allows efficient use of the incoming signal.

The use of this device improves the accuracy of processing discontinuous radio signals in conditions where the law of interruption may be of a random irregular nature unknown at the receiving point.

Claims (1)

Invention Formula i A device for measuring the phase of a discontinuous radio signal, containing the composer Yu. Makarevich Editor O, Sensey Tekhred L.O. iynyk Proofreader M.Sharoshi Order 8095/51 Circulation 714 VNIIPI State Committee for Inventions and Discoveries under the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. the first multiplier, the first input of which is the input of the device, characterized in that, in order to improve the measurement accuracy, introduced in series are an integrating RC circuit and a threshold unit, with the output of the first amplifier; connected to the input of the integrating RC circuit, the output of the threshold unit is connected to the control inputs of the first and second keys, the second input of the threshold unit is connected to the additional second output of the constant unit. Subscription