KR100309555B1 - Coherent Repeater Using Frequency Synthesizer - Google Patents

Abstract

The present invention relates to a coherent repeater, and more particularly, to provide a coherent repeater capable of miniaturization and low power consumption.

According to the present invention, a coherent relay device for outputting a transmission signal having a frequency proportional to a frequency of a reception signal, comprising: a plurality of amplifiers multi-amplifying a reception signal and oscillating a transmission signal having a frequency corresponding to an input signal; A voltage controlled oscillator, a plurality of multipliers for receiving the output signal of the voltage controlled oscillator and multiplying and outputting the frequency signal, and a plurality of frequency converters for multi-stage converting the frequency of the received signal by receiving the output signal of the frequency multiplier and the amplified signal for each stage And a plurality of band pass filters for filtering only signals of a predetermined frequency band by filtering the frequency-converted signal step by step, wherein the multiplier includes a first divider for dividing an input signal and a frequency corresponding to the divided input signal. Coherent relay device comprising a voltage controlled oscillation element for oscillating a voltage signal of It is provided.

Description

Coherent Repeater Using Frequency Synthesizer

The present invention relates to a coherent relay device, and more particularly, to a coherent relay device capable of miniaturization and low power consumption.

A coherent relay apparatus is a device that tracks a received signal to recover a carrier wave, demodulates a received signal, and generates and transmits a high frequency signal having a constant frequency ratio with respect to the restored carrier.

As shown in FIG. 1, the coherent relay apparatus according to the related art has a constant frequency ratio with respect to the transmitter 110 and the recovered carrier, which recovers the carrier by demodulating the received signal and demodulates and outputs the received signal. The receiver 130 is provided to restore and transmit a high frequency signal.

Now, look at the operation of the coherent relay device according to the prior art.

First, the signal input to the coherent relay from the outside is the first amplifier 111, the first frequency converter 112, the second amplifier 113, the first bandpass filter 114, the second frequency converter ( 115, the third amplifier 116 and the second bandpass filter 117 are converted into an intermediate frequency signal and input to the phase comparator 118.

The phase comparator 118 receiving the signal whose frequency is converted into the intermediate frequency compares the phase of the received intermediate frequency signal with the phase of the signal input from the first divider 121, and compares the phase with the loop filter. Output to the voltage controlled oscillator 126 through 120.

In this case, the loop filter 120 uses a low pass filter and removes high frequency components from the output of the phase comparator 118 so that the entire circuit is not oscillated.

Subsequently, the output signal of the voltage controlled oscillator 126 passes through the first multiplier 127, the third frequency converter 124, the second divider 123, and the third bandpass filter 125. Entered at 115.

In addition, the output signal of the voltage controlled oscillator 126 is input to the first frequency converter 112 via the first multiplier 127, the second multiplier 128, and the third bandpass filter 129.

The conventional coherent repeater allows the output frequency of the voltage controlled oscillator 126 to have a constant ratio with the frequency of the received signal through this process. That is, a change in the frequency of the received signal changes the output of the loop filter 120, and subsequently changes the output frequency of the voltage controlled oscillator 126, and also the input frequencies of the first and third frequency converters 112, 124. By converting the output signal frequency of the voltage controlled oscillator 126 has a constant ratio with the frequency of the received signal.

The output of the voltage controlled oscillator 126 is multiplied by the transmission frequency through the third multiplier 133 and the fourth multiplier 135 and output. Through this process, the frequency of the received signal and the transmitted signal has a constant ratio.

However, the coherent repeater according to the related art is a method using an analog component such as a phase comparator, a loop filter, a voltage controlled oscillator, and a plurality of frequency multipliers, and the analog component has high power consumption and volume, There was a problem that it is difficult to adjust because there are many adjustment points.

In addition, the coherent repeater of the prior art requires at least four dividers in order to configure the local oscillation frequency multiplier and the frequency multiplier in the transmitter, and a plurality of filters for suppressing the generation of harmonics. There was a difficulty in production.

The present invention has been made to solve the problems of the prior art as described above, the signal received by using a frequency synthesizer consisting of a frequency divider and a phase synchronization circuit that can be used in various transmission and reception frequency ratios and can be integrated It is an object of the present invention to provide a coherent repeater using a frequency synthesizer capable of generating and transmitting a high frequency signal having a constant frequency ratio with respect to the restored carrier after recovering the carrier by recovering the carrier.

1 is an exemplary view showing a schematic configuration of a coherent relay device according to the prior art,

2 is a block diagram of a coherent repeater using a frequency synthesizer according to an embodiment of the present invention,

3 is a block diagram of a multiplier shown in FIG.

♠ Explanation of symbols on the main parts of the drawing ♠

201, 203, 206, 216: Amplifier

202, 205: frequency converter

204, 207, 215: bandpass filter

208: Phase Comparator

209, 323 loop filter

210, 324: voltage controlled oscillator

211, 212, 213: Multiplier

214 modulator

310, 321: Divider

320: phase synchronization circuit

322: phase detector

According to the present invention for achieving the object as described above, in the coherent relay device for outputting a transmission signal of a frequency proportional to the frequency of the received signal, a plurality of amplifiers for multi-amplifying the received signal and the input signal A voltage controlled oscillator for oscillating a transmission signal of a corresponding frequency, a plurality of multipliers for receiving the output signal of the voltage controlled oscillator and multiplying the frequency and outputting the output signal; A plurality of frequency converters for multi-stage frequency conversion, and a plurality of band pass filters for outputting only signals of a predetermined frequency band by filtering the frequency-converted signal step by step, wherein the multiplier includes: a first divider for dividing an input signal; And a voltage controlled oscillation element oscillating a voltage signal of a frequency corresponding to the divided input signal. The coherent relay apparatus according to claim is provided.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the coherent relay apparatus according to the present invention will be described in detail.

2 is a block diagram of a coherent relay apparatus using a frequency synthesizer according to an embodiment of the present invention.

As shown in the figure, the coherent repeater using a frequency synthesizer according to an embodiment of the present invention outputs amplified signal K0F1 (where K0 represents a number multiplied by a constant frequency F1) input from the outside. A first frequency converter 202 for converting a frequency band of a received signal into an intermediate frequency band by mixing the first amplifier 201, the output of the first amplifier 201 and the output of the first multiplier 212, The first bandpass filter 204 for removing unnecessary signals such as noise by receiving the output of the second amplifier 203 and the output of the second amplifier 203 to amplify the output of the first frequency converter 202. And mixing the signal passing through the first bandpass filter 204 and the output signal of the second multiplier 211 to convert the frequency band of the signal passing through the first bandpass filter 204 into an intermediate frequency band. Two frequency converter 205, A third amplifier 206 for receiving and amplifying the output of the second frequency converter 205, a second bandpass filter 207 for removing unnecessary signals such as noise by receiving the output of the third amplifier 206, Receives the signals of the phase comparator 208 and the phase comparator 208 for comparing the phase of the signal passed through the second bandpass filter 207 with the signal input from the voltage controlled oscillator 210 and outputting a comparison result. Loop filter 209 for filtering and outputting high frequency signals so that the entire circuit does not oscillate, Voltage controlled oscillator 210 for generating and outputting periodic signal F1 that receives the filtered signal and vibrates at a constant frequency, Voltage controlled oscillator A periodic signal from the second multiplier 211 and the voltage controlled oscillator 210 for multiplying the periodic signal input from the 210 by a predetermined ratio K2 and outputting it to the second frequency converter 205 is received at a predetermined ratio K1. Modulating the outputs of the first multiplier 212 for multiplying and outputting the signal input from the voltage controlled oscillator 210 at a predetermined ratio K3 and outputting the third multiplier 213 and the third multiplier 213 The modulator 214 for receiving, and amplifying and outputting the signal passed through the third bandpass filter 215 and the third bandpass filter 215 for passing only the signal of a predetermined band to receive the modulated signal The fourth amplifier 216 is provided.

The frequency of the signal passing through the first frequency converter 202 becomes (K0-K1) F1 when the frequency of the signal input from the outside is K0F1.

In addition, the frequency of the signal passing through the second frequency converter 205 is ((K0-K1) -K2) F1.

Therefore, in order for the output of the voltage controlled oscillator 210 to change the output frequency so that it can follow the fluctuation of the frequency, the multiplication ratios K1 and K2 are represented by the following (Equation 1).

When the multiplication ratio satisfies the above condition, the output frequency of the second frequency converter 205 becomes equal to the output frequency of the voltage controlled oscillator 210.

Through this, the frequency K0F1 of the input signal and the frequency of the voltage controlled oscillator 210 are represented by a constant ratio, and the phases of these signals have a constant relationship.

When the output of the voltage controlled oscillator 210 is synchronized with the received signal, the frequency of the output signal of the voltage controlled oscillator 210 is multiplied by the third multiplier 213 for transmission and supplied to the transmitter.

The frequency ratio of the entire repeater is expressed as K3 / K0. Since the multiplication ratio of the third multiplier 213 can be set to a fraction rather than an integer, the frequency ratio selection of the repeater becomes wider. And the multiplication ratio of each multiplier 211, 212, 213 is set by the multiplier adjuster 217 at the beginning of operation | movement. On the other hand, the multiplier regulator 218 sets the frequency ratio of the entire repeater by adjusting K1, K2, and K3.

3 is a configuration diagram of the multiplier shown in FIG. 2.

As shown in the figure, the multiplier shown in FIG. 2 includes a first divider 310 and a phase synchronization circuit 320 for dividing and outputting the signal Fi input from the outside at a ratio of R. As shown in FIG.

In addition, the phase synchronization circuit 320 receives the output signal of the voltage-controlled oscillator 324 and divides the second divider 321 and divides the output signal of the first divider 310 and the first divider at a predetermined ratio M. Phase detector 322 for comparing the output signals of the two dividers 321 to detect and output a phase, and receiving a phase detected signal from the phase detector 322 to remove a high frequency signal capable of oscillating the entire circuit. And a voltage controlled oscillator 324 for oscillating and outputting a signal having a constant frequency according to the input of the loop filter 323 and the filtered signal.

At this time, the multiplication ratio of the output signal to the input signal Fi is M / R, the loop filter 323 in the multiplier has a wider band than the loop filter of Figure 2 so that the voltage controlled oscillator 210 of FIG. Frequency fluctuations can be tracked.

In addition, the use of the integrated frequency synthesizer (in one embodiment of the present invention used a phase synchronizing circuit, which is a kind of frequency synthesizer), has the effect of reducing volume and power consumption.

On the other hand, in the case of the NASA STDN repeater, the frequency ratio is 240/221, and when the present invention is applied, a frequency ratio of 210/221 is obtained by setting K1 to 104, K2 to 11/2, and K3 to 120. .

In this case, the bandwidth of the loop filter 209 is 50 Hz, and the bandwidth of the loop filter 323 in the multipliers 211, 212, 213 is 500 Hz.

As described in detail above, the coherent repeater of the present invention can manufacture a repeater with a small volume and low power by using an integrated frequency synthesizer, and its configuration is simple, which makes it easy to design and manufacture. have.

The technical idea of the coherent relay apparatus of the present invention has been described above with reference to the accompanying drawings, but this is by way of example and not by way of limitation. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (7)

A coherent repeater for outputting a transmission signal having a frequency proportional to a frequency of a reception signal, comprising: a plurality of amplifiers multistage amplifying a reception signal, a voltage controlled oscillator for oscillating a transmission signal having a frequency corresponding to an input signal, A plurality of multipliers for receiving the output signal of the voltage controlled oscillator and multiplying and outputting the frequency signal; a plurality of frequency converters for receiving the output signal of the frequency multiplier and the amplified signal for each step and multi-stage converting the frequency of the received signal; And a plurality of band pass filters for outputting only signals of a predetermined frequency band by filtering the converted signal, wherein the multiplier outputs a first divider for dividing an input signal from the outside at a predetermined ratio and an output of the first divider. It is characterized in that it comprises a phase synchronization circuit for receiving and inputting the oscillator outputs a predetermined frequency signal Coherent relay device. 2. The coherent relay device according to claim 1, further comprising a multiplier, a modulator, a band pass filter, and an amplifier provided at a transmission signal output terminal of the voltage oscillator. The oscillator of claim 1, further comprising a phase comparator and a loop filter provided at an input of the voltage controlled oscillator, wherein the phase comparator compares a phase of a multi-stage converted signal with a signal distributed from the voltage controlled oscillator. And a loop filter filters a signal circulated in a circuit more than a predetermined number of times according to the comparison value. The phase synchronizing circuit according to any one of claims 1 to 3, wherein the phase synchronization circuit is configured to receive an output signal of the voltage controlled oscillator and divide the output signal at a predetermined ratio, the output signal of the first divider and the output signal; A phase detector for detecting and outputting a phase by comparing output signals of a second divider, a loop filter for receiving a phase detected signal from the phase detector, and removing a high frequency signal capable of oscillating an entire circuit, and filtering in the loop filter And a voltage controlled oscillator for oscillating and outputting a signal having a predetermined frequency according to the voltage of the input signal. 5. The multiplier of claim 4, wherein the multiplier additionally includes a loop filter provided between the phase detector and the voltage controlled oscillation element, wherein the loop filter filters a signal circulating a circuit more than a predetermined number of times. Coherent repeater. 5. The coherent relay device according to claim 4, further comprising a multiplier adjuster for adjusting the magnification of the multiplier. 5. The coherent relay device according to claim 4, wherein the frequency synthesis circuit including the multiplier is formed of one integrated chip.