SU1282164A1 - Sine signal correlator - Google Patents

Abstract

The invention relates to the field of specialized computing equipment and can be used in receiving indicators of phase radionavigation systems. The purpose of the invention is to improve the accuracy of the correlator. Into it, in the sine and cosine channels, in series, connected voltage adders, voltage converters — frequency and elements AND with corresponding functional connections between them and known correlator blocks are introduced. The use of sinusoidal voltage-frequency transducers (VFDs) with appropriate connections in the correlator leads to a decrease in linearity error, since the integration cycle time is reduced by 2 orders of magnitude. The frequency of such a FPD does not depend on the size of the integrating capacitance, but is entirely determined by the impulse feedback circuit generating pulses of a constant volt-second area. In addition, no additional time is required to produce a result, since it is possible to simultaneously produce results simultaneously with the integration of the input signal. 1 il. with (L to c to O5

Description

112

The invention relates to specialized computing equipment, in particular, in receivers of phase radio navigation systems, operating mainly with multi-frequency sinusoidal signals with low signal-to-noise ratios and possessing high accuracy.

The purpose of the invention is to increase accuracy.

The drawing shows a structural diagram of a correlator.

The correlator contains an amplifier 1, a generator 2 of the reference signal, a phase-shifting circuit 3, the first 4 and second A detectors, the source 5 of the reference voltage, the information input

and second 7- adders.

6, first 7,

the first 8 and the second 8 voltage to frequency converters, the first

9, and second 9,

outputs 10

, d., - .. VJ elements, and 10, divisor 11.

The correlator works as follows.

The input signal undergoes detection in the detectors 4 and with the reference signals shifted one relative to the other by 90. The frequency of the generator 2 coincides with the frequency of the input signal. Detektoi

during half period 4.

Yes, the reference signal passes an input sinusoidal signal to the inputs of transducers 8 and 8, which produce pulse signals. The frequency of the latter is proportional to the integral of the sum of the voltages of the reference and output from the detectors 4 and 4 signals. The output signal of the correlator is the pulse repetition rate of the sine-transform2 at the outputs 10 and 10

go and cosine channels

8, and 8i2 are based on

integrator and pulse back

connection.

A feature of such converters is that the frequency at

their output does not depend on the change in the values of the integrator capacitance, on the majority of resistive elements, on the level of the reference voltage and the drift of the comparison elements, but is determined only by the parameters of the impulse feedback circuit that produces a constant volt square moment at the time of the comparison .

Claims (1)

Invention Formula five 0 five 0 A correlator of a sinusoidal signal containing an amplifier, a reference signal generator. The first and second detectors and the phase-shifting circuit, the information inputs of both detectors are connected to the amplifier output, whose information input is the correlator input of the same name, the output of the reference signal generator is connected to the reference voltage input of the first detector, and through the phase shift circuit to the second detector's input of the same name , characterized in that, in order to increase accuracy, a reference voltage source, two adders, a divider, two voltage-to-frequency converters and two AND elements are introduced into it, The outputs of which are the first and second codes of the correlator, respectively, are the first inputs of both. the adders are connected to the output of the source of the reference voltage, the second inputs with outputs of both detectors. respectively, the codes of the adders are connected to the information inputs of the corresponding voltage-to-frequency converters, the outputs of which are connected to the first inputs of the corresponding elements AND, the second inputs of which are the clock input of the correlator, the code of the reference signal generator through a divider, connected to the reference input of the reference i signal of both voltage to frequency converters. 0 five