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=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:
where Kmaxthe transmission coefficient of the filter 10 at a frequency of
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.
FIELD: automatic data acquisition systems.
SUBSTANCE: proposed method designed for data acquisition from burglar and fire alarm sensors, electricity, heat, and gas meters, and from fiscal memory of cash registers involves use of unique random or pseudorandom plurality of differences in initial phases of closest harmonic pairs, mentioned plurality being chosen so as to minimize peak factor of total signal. In case of operation of fire alarm sensor it is sufficient to transfer only one character to alarm control console unambiguously identifying location of operating sensor; as a rule, such character is conditional number or address pre-assigned to sensor.
EFFECT: reduced power requirement of subordinate system units and/or enhanced range of their operation.
1 cl, 2 dwg
FIELD: radio engineering; portable composite phase-keyed signal receivers.
SUBSTANCE: proposed receiver has multiplier 4, band filter 6, demodulator 8, weighting coefficient unit 5, adding unit 7, analyzing and control unit 10, synchronizing unit 3, n pseudorandom sequence generators 21 through 2n, decoder 1, and switch unit 9. Receiver also has narrow-band noise suppression unit made in the form of transversal filter. Novelty is that this unit is transferred to correlator reference signal channel, reference signal being stationary periodic signal acting in absence of noise and having unmodulated harmonic components that can be rejected by filters of simpler design than those used for rejecting frequency band of input signal and noise mixture. Group of synchronized pseudorandom sequence generators used instead of delay line does not need in-service tuning.
EFFECT: facilitated realization of narrow-band noise suppression unit; simplified design of rejection filters.
1 cl, 8 dwg
FIELD: radio engineering, applicable in antiference radiolinks.
SUBSTANCE: the method is featured by the fact that the pseudorandom sequence with clock pulse fp and for expansion of the spectrum is divided into two orthogonal sequences, one of which contains only even harmonics of the initial pseudorandom sequence, and the other - only the odd ones, then each of the obtained sequence is multiplied with a simple phase-manipulated signal, then the upper side band is separated from the spectrum of one obtained signal, and the lower side band - from the spectrum of the other signal, these unlike side bands are summed up, in each side band two narrow sections of the spectrum symmetrical relative to frequency f0+1/2fp, in the upper side band and relative to frequency f0-1/2fp in the lower side band, one of the separated sections of the spectrum in each side band of the separated spectrum sections is amplified to the known magnitude, and the other, symmetrical to it, is inverted, after which the separated and remained non-separated sections of the spectrum in both side bands are summed up, the separated narrow spectrum sections in each side band are altered according to the pseudorandom law.
EFFECT: enhanced anti-interference of the radiolink is attained due to the fact that in the method of normalization of the composite phase-manipulated signal consists in expansion of the spectrum of the simple phase-manipulated signal obtained by multiplication of the carrying sinusoidal oscillation with frequency f0 and the binary information signal.
FIELD: radio engineering.
SUBSTANCE: device implements algorithms of discontinuous Fourier transformation and fast folding of received and bearing signals, to provide search-less detection of complicated signals with sizeable bases. Digital synchronized filter processes at video-frequency with use of standard digital assemblies and elements. Device has multipliers 3,4,14,15, phase changer 2 for π/2, circuit for delay for length of signal element 1, low frequency filters 5,6, analog-digital converters 7,8,12, microprocessor systems of discontinuous Fourier transformation 9,10, microprocessor systems of reversed discontinuous Fourier transformation 16,17, generator of bearing pseudo-random series 11, microprocessor systems of discontinuous Fourier transformation of bearing pseudo-random series 13, square-ware generators 18,19, adder 20, arithmetic device for taking square root 21, threshold device 22, discontinuous process pulse generator 23, device for splitting frequency in two 24, clock generator 25, interconnected by appropriate functional connections.
EFFECT: broader functional capabilities, higher efficiency.
FIELD: radio engineering.
SUBSTANCE: device, having bearing oscillation generator, output of which is connected to signal input of first key and to input of first phase shifter, output of which is connected to signal input of second key, outputs of first and second keys are connected to appropriate inputs of adder, output of which through multiplier is connected to output of device, device additionally has pseudo-random series generator, clock input of which is connected to output of clock pulse generator, and synchronization input is connected to output of synchronization pulse generator and to second synchronization means input, first input of which is input of information signal, and output is connected to second multiplier input, device also includes commutation block, M decoders, M-2 keys, M-2 phase shifters, pseudo-random series delays block.
EFFECT: better concealment and detection protection level of generated signal.
FIELD: radio engineering.
SUBSTANCE: known digital device for demodulation of discontinuous signals in multi-beam communication channel, having block for transformation of input signal, solving circuit, shift register and demodulation block, consisting of N serially connected detection blocks and N-input adder, additionally has (M-1) demodulation blocks and M-input adder, and in each of N blocks for detecting each of M demodulation blocks, additionally inserted are power measuring device and device for forming weight coefficient.
EFFECT: higher resistance of receipt to interference and compatibility of device with multi-position signals receipt.
FIELD: technology for recognizing radio-signals, in particular, methods for detecting type and modulation parameters of radio signals.
SUBSTANCE: for realization of method during recognition received radio signal is digitized by time and quantized by level. Value of bearing and clock frequencies of signal are determined and cophased and quadrature components of radio signal are formed. These are then filtered and selection counts of cophased and quadrature components of radio signal are selected, taken in counting time moments, determined by value of clock frequency. After that, selection counts of cophased and quadrature components of radio signal are corrected in complex form, using gradient algorithm for adjusting corrector coefficients. Then estimate of selections is split onto given number of clusters, equal to position coefficient of recognized signals, and values of clusterization error functional are calculated, received values are compared and decision is taken about relation to class by minimum of error functional value.
EFFECT: increased probability of correct recognition under multi-beam conditions.
5 cl, 9 dwg
FIELD: modulation and demodulation in reception and transmission including when using expanded signal spectrum.
SUBSTANCE: proposed method for digital communications with signal whose spectrum is expanded by modulation using complementary Golay numbers involves following procedures: during transmission input binary data are integrated into η groups of m = log2A bits, A modulation by peak values, spectrum expansion by means of η complementary Golay numbers or by complementary Golay numbers whose phase and sign are changed, modulation in N-phase keying mode, and transmission over communication channel; reception involves phase demodulation, convolution with respective Golay complementary numbers, amplitude demodulation, and source data generation.
EFFECT: enhanced transfer speed and spectrum expansion ratio.
7 cl, 4 dwg
FIELD: radio engineering, possible use in radiolocation stations for allowing phase-code manipulated signals with approximately equal frequencies.
SUBSTANCE: input signal of device is an additive mixture of video-frequency phase-code manipulated signals with varying amplitudes and delays, encoded by M-series, digitized with temp in two counts on elementary analog quantization step in strobe M=4·n-1. By means of first adder and first shift register input signal by its recirculation amounts to interval, equal to 2·n. By means of first commutator signal is divided on even and odd series, which in turns pass to block of cross connections, then to block of fast Walsh transformation, and further to block of reverse check connections and second commutator. From the latter signals are sent to block for synchronization with elementary quantization step two counts long. Further signals are sent to third commutator, which in accordance to its evenness and oddness order sends them to second adder. By means of second adder and second shift register, signal from third commutator by its recirculation amounts to interval, equal to 2·n.
EFFECT: substantially decreased computer power costs due to recirculation transformation of input signals, making it possible to apply fast Walsh transformation.
3 cl, 8 cl
FIELD: data transmission.
SUBSTANCE: methods are claimed for processing data transmission in transmitter and receiver using native channel decomposition, channel inversion. In the transmitter, native decomposition of channel is performed to determine native modes of 3G network channel and to produce first set of control vectors; channel inversion is performed to produce weight coefficients, for example, one set for each native mode, used to minimize distortions introduced by inter-symbol interference, scaling values are produced, which characterize powers of transmission, distributed across native modes, where first set of control vectors, weight coefficients and scaling values are used to produce an impulse generation matrix, which is used for preliminary reduction of modulation symbols to meet required conditions before the transmission. In the receiver, native decomposition of channel is performed to produce second set of control vectors, which are used to produce an impulse generation matrix, used to reduce received symbols to meet required conditions in such a way, that orthogonal symbol streams are restored.
EFFECT: ensured high traffic capacity.
12 cl, 10 dwg