The method of forming photomanipulating signal and device for its implementation

 

(57) Abstract:

Usage: in radio communications and radar systems. The inventive method consists in the generation of the intermediate frequency signal phase manipulation and strengthening photomanipulating of the intermediate frequency signal, converting photomanipulating signal of the intermediate frequency signal of the operating frequency and the gain of the signal power of the operating frequency, generating an additional signal whose frequency is not equal to the intermediate frequency, and to gain photomanipulating the intermediate frequency signal summed with the additional signal, and after amplifying the summed signal of limited amplitude. The device includes a signal generator intermediate frequency, key, unit conversion information, bandpass filters, intermediate frequency amplifier, mixer, local oscillator, power amplifier, single-ended filter, the amplitude limiter. 4 Il.

The invention relates to radio communication and radar systems.

The purpose of the invention is to reduce the level side of the spectrum components.

The method is based on generating a signal of intermediate frequency, phase manipulation and strengthening Fatma - nipulate in the signal of the operating frequency and the gain of the signal power of the operating frequency, generating an additional signal whose frequency is not equal to the intermediate frequency, and to gain photomanipulating the intermediate frequency signal summed with the additional signal, and after amplifying the summed signal of limited amplitude.

In Fig. 1 shows a block electrical diagram of the device illustrating the method of Fig.2 - structural electrical diagram of the device for the formation of the FM signal, carrying out the method.

The device (see Fig.1) comprises a generator 1 signal intermediate frequency (if), key 2, block 3 recoding information, band-pass filter 4, the amplifier 5 FC, mixer 6, a local oscillator 7, the bandpass filter 8, the power amplifier 9, an additional generator 10, an adder 11 and the amplitude limiter 12.

The device (see Fig.2) comprises a generator 1 of the if signal, key 2, block 3 recoding information, the first band-pass filter 4, the amplifier 5 FC, mixer 6, a local oscillator 7, the second band-pass filter 8, an amplifier 9 power, single-ended filter 10 and the amplitude limiter 11.

Thus the output of the generator 1 through the key 2, to the control input of which is connected to the output unit 3 is connected to the unbalanced input of the filter 10, the output of which is n to the first input of the mixer 6, a second input connected to the output of the local oscillator 7. The output of the mixer 6 via a second band-pass filter 8 is connected to the input of the power amplifier 9, the output of which is the output device.

To explain the method of forming the FM signal will consider the operation of the device shown in Fig.1.

The digital signal produced at the output of unit 3 controls the key 2, commuting entering sinusoidal voltage of the inverter. At the exit key 2 is formed of the FM-if signal, which is routed to the first output of the adder 11, the second input of which receives an additional signal from generator 10 with a frequency that is different from the intermediate. The total output of the adder 11 through the band-pass filter 4 and the amplifier 5 is fed to the limiter 12. The filter 4, tuned to an intermediate frequency, limits the bandwidth of the path of the inverter so that its width was 2...3 times greater than the width of the main lobe of the spectrum of the FM-if signal, which allows to save energy parameters of the signal and at the same time to resolve the side components of the spectrum of the input signal.

Assuming conversion of the signal to the output of the power amplifier is linear, consider the passage of a separate signal premiato is Yes amplifier 5 at the time of switching phase t = toat the input of the limiter signal occurs, which in time can be described by the expression

ao(t) = EoKmaxe - EoK1-e cos[o(t-to)+o]

where Eaboutthe amplitude of the signal at the output of the key 2;

TOmax- the maximum ratio transmission chain filter 4 amplifier 5 voltage;

to- the time constant of the resonant circuit of the amplifier 5 and the filter 4 with the influence of the load;

o- intermediate frequency;

o- phase signal at the switching moment.

The expression is considered that the setting of the filter 4 and the amplifier 5 o.

The minus sign before the second term corresponds to the change in phase of the signal at t = to180about.

The signal amplitude andabout(t) can be represented by the expression

Ao(t) = EoK1-2e

At time to+ t '= ln2/2 f, where f is the bandwidth at -3 dB, the signal amplitude becomes zero.

Consider the passage of an additional signal. Let the frequency of the additional signal 1not the sameobut lies in the bandwidth f, and the inclusion of this signal (if the signal pulse) occurs at the moment veramani at the output of the amplifier 5 can be written as expressions

< / BR>
where E1(t) is the amplitude of the additional signal at the output of the key 2;

=tothe detuning parameter;

=o-1- the frequency difference between the primary and secondary signals.

The dependence of the amplitude of the total signal at the input of the limiter 12 can be written as

< / BR>
where

K = ;i= t-ti; (i = 0,1,2)

1= arctan

2= arctan

1=1(t1-to)+o;2=1(t2-to)+o< / BR>
Analysis of this dependence shows that the equality to zero of the amplitude of the total signal during the transition process is possible only if = 0 and antiphase1,2= 180aboutthe primary and secondary signals.

In all other cases, a decrease in the amplitude of the total signal up to a certain value that is not equal to zero, which allows limiting the amplitude at the level of its minimum value during the transition process, to obtain at the output of the limiter 12 a signal of constant amplitude with the phase of the discrete variable 180aboutduring the switching and gradually turns from one extreme value to another during the transition process, the duration of which is defined by a constant times the input of the mixer 6, which receives the signal from the local oscillator 7. Band-pass filter 8 emits high frequency FM signal, which is then amplified by the power amplifier 9 to a specified power level.

Additional analysis of the expression for the amplitude of the total signal shows that as additional signal generator and adder can be used single-ended filter, i.e. the filter detuned relative to the carrier frequency of the FM signal. The additional signal are damped oscillations at the natural frequency of resonance of the filter, resulting in the filter due to the transition process in the moment of switching of the phase of the discrete impulse.

Structural electrical diagram of the device for forming an FM signal using a single-ended filter shown in Fig.2.

The signal (see Fig.2) coming from the output unit 3 controls the key 2, commuting entering voltage of the inverter. At the exit key 2 is formed photomanipulating the if signal, which is fed to single-ended filter 10 and then through the filter 4 and the amplifier 5 is fed to the input of the limiter 11.

The filter 4 is used to eliminate side of the spectrum components of vhodni the frequency of its own resonance.

Considering to simplify expressions that filter 10 is a single loop, the dependence of the signal at the output time can be described by the expression:

a(t) =

where Kmaxthe transmission coefficient of the filter 10 at a frequency of

= arctan

Graphics of this dependence, normalized relative to EaboutTOmax, shown in Fig.3. In the case of a multi-circuit filter 10 quantitative ratio change, but the essence of the emerging processes remains the same.

In Fig. 4 shows the time dependence of the signal power at the output patientennahe filter 10, normalized relative to the signal power at the moment of switching phase. It is seen that under certain parameter values of the detuning of the output patientennahe filter can be obtained not only fall, but even the increased amplitude of the signal during the transition process, which allows, by limiting the amplitude of the signal using a limiter 12, to receive at the input of the mixer 6 continuous signal, in which there are no "gaps" between the phase increments. The mixer 6, which receives the signal from the local oscillator 7, converts the FM-if signal in the higher frequency signal. Band-pass filter 8, standing at the exit will smusic the M signal of the inverter. To the specified power level of the FM signal is amplified by the amplifier 9.

The use of the invention will in 3-4 times to narrow the width of the spectrum of out-of-band radiation level 30. . .60 dB the level of the carrier due to the exclusion of "gaps" between pulses of the phase increments and increase the reliability of the device due to the elimination of the "emission" of the supply voltage on the collectors of the transistors transistor amplifier during amplification of the FM signal without pauses between increments.

1. The method of forming photomanipulating signal based on the generated intermediate frequency signal, phase manipulation and strengthening photomanipulating of the intermediate frequency signal, converting photomanipulating signal of the intermediate frequency signal of the operating frequency and the gain of the signal power of the operating frequency, characterized in that, to reduce the level of spurious components of the spectrum, generating an additional signal whose frequency is not equal to the intermediate frequency, and to gain photomanipulating the intermediate frequency signal summed with the additional signal, and after amplifying the summed signal of limited amplitude.

2. Device for the formation of the first frequency and the key, to the control input of which is connected the output of block encoding information, sequentially connected to the first bandpass filter and amplifier intermediate frequency and connected in series mixer, to the control input of which is connected to the output of the local oscillator, the second band-pass filter and amplifier whose output is the output of the device, characterized in that, to reduce the level of spurious components of the spectrum, introduced asymmetric filter, input and output of which are connected respectively with the output key and the input of the first bandpass filter, and the amplitude limiter, the input and output of which are connected respectively with the output of the amplifier promezhutochnoi frequency and the signal input of the mixer.

 

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