The method of formation and compression of the signal
The invention relates to the field of electrical engineering and can be used in radio engineering measurements and acoustic measurements. The technical result consists in the realization of the possibility of forming and signal processing with simplified algorithm with preservation of exceeding the amplitude of the Central peak over the side components. The method of formation and compression of the signal based on the generation of pulses transmitted in a sequence, as well as on the strengthening of the received pulse signal and its subsequent processing, when the signal generation of the next pulse from the third, carried out with an interval that differs from the previous by an amount commensurate with the duration of the pulse compression of the received signal is carried out by summation of the pulses, the interval between adjacent pulses is defined asTi+1=T1+si, whereT1- the value of the first order interval; i is the number of signal; s is the increment interval, in the particular case of equal pulse duration. 1 AD. and 2 C.p. f-crystals, 2 Il.
The invention relates to the field of electrode is Mirovaya and compress the signal with pulse modulation involves signal processing, presented in a sequence of radio pulses, equally spaced from each other . When compressing the thus formed signal are lateral components, which causes ambiguity in the production measurements.
A method of processing a pulse signal, providing suppression of lateral components . The disadvantage of this method is the reduction of the amplitude and broadening of the pulse corresponding to the Central maximum.
The prototype of the invention is selected closest to the inventive method of forming and compression signal with pulse modulation, represented as a sequence (stack) pulse, which is formed by shifting each of the pulses relative to the beginning of the sequence by an amount varying depending on the position of the pulse in the stack, while in the process of processing a received signal to carry out the conversion of the oscillation of the delay pulses and signal compression by summing pulses .
The challenge which seeks the invention is to simplify the algorithm, and compression of the pulse signal by maintaining the quality of the processing of a received signal.
Specified sagedasemad in a sequence, and on the strengthening of the pulse signal after its receipt and subsequent processing of pulses, forming a sequence of pulses, the generation of the next pulse from the third, carried out with an interval that is different from the previous one, for example, modify the named interval by an amount commensurate with the duration of the pulse (approximately equal to the pulse duration). For a signal at the carrier frequency perform amplitude modulation of the carrier oscillations by using the above-mentioned pulses generated during the forming sequence. Compression of the received signal produced by the optimum processing sequence of pulses, for example, carry out the summation of the pulses after a delay in time
where tnthe duration of the pulse sequence;Tj- the interval between adjacent pulses; tu- pulse duration; i is the number of pulse in the sequence; N is the number of pulses in the sequence, the value oft1set depending on the magnitude of the increment specified interval between pulses in the process of their generation, for example, PU, approximately equal to the pulse duration.
The technical result of the invention is the realization of the possibility of forming and signal processing with simplified algorithm with preservation of the same, as in the known method, the excess of the amplitude of the Central peak over the side components that facilitate implementation schemes, improving the reliability and efficiency of the method.
The invention is illustrated by drawings, where Fig.1 presents a block diagram of the formation of the pulse sequence of Fig.2 shows a diagram of signal processing by the compression of the pulse packet.
For forming packs of pulses can be used, the schema of Fig.1 generator 1 pulse (GI) connected to the unit 2 control and coupled with delay lines (LPA) 3 associated with the adder 4, the output of which is connected to the modulator 5, the second input of which is applied a high-frequency signal (carrier voltage) ~ u. The output of the modulator 5 is connected with a transmitter (not shown).
The scheme provides compression signal by summing the pulses in accordance with Fig.2 contains connected to the receiver (not shown), the mixer 6 is associated with the local oscillator 7; amplifier between the government of block 10 delay lines (LPA) is connected to a linear adder 11, associated with the recording device 12.
The formation of bundles transmitted at the carrier frequency of the pulses is as follows.
Output KI-1 command block 2 control is formed by a rectangular pulse, which is fed to the inputs of the 3, where the delay of the pulse at a given time. Time offset (delay) pulse relative to the beginning of the sequence for each LPA is different and is determined in accordance with the equality
where i is the sequence number of 3, corresponding to the number of pulse per bundle;Tjthe interval between this and the previous pulse, which is determined by the formula
where s is the increment interval. In the particular case stuwhile askingT10. Shifted pulses from the outputs of the 3 are received at the inputs of the adder 4, which is formed by a sequence of pulses, which are then fed to the modulator 5, which, in addition, served high-frequency voltage of ~ u. The result is a signal with pulse modulation, which is then passed in. It is also possible formation of posledovatelnostyakh between pulses using the above expression, assuming s- tu. In this case, specify
Signal processing is as follows.
Adopted at the carrier frequency of the pulse signal fed to the mixer 6, which is also fed the signal from the local oscillator 7. The result is frequency conversion. In the process of amplification and filtering oscillations in the amplifier 8 to produce the intermediate frequency signal. After rectification in the rectifier 9 signal in the form of a pack of videokursov served on the block 10 LPA. If the signal amplification is performed at the carrier frequency, then the need for frequency conversion is eliminated. The delay of each pulse is carried out in accordance with its offset on the time determined in accordance with expression (1). Corresponding to the offset delay of the pulses is achieved by pre-setting (selection) of the block 10. After a delay pulses serves to linear adder 11, which is the accumulation of the signal due to the summation of the pulses. The maximum value resulting from the summation of the signal measured by the recording device 12. For a rational choice of duty cycle and number of pulses in a packet lateral components of total sign ten times greater than the noise level, educated lateral components, eliminating the ambiguity in the measurement.
As shown by experimental verification on digital models, signal processing in accordance with the expression (2) and its processing by the delay of the pulses in accordance with the expression (1) and summing provide a solution to the task. Also confirmed high efficiency of the compression process of the considered sequences, regardless of the method of optimal processing of pulse signal.
Sources of information
1. Radar devices / in. A. Vasin, O. C. Vlasov, V. Century Gregorin - Ryabov, etc. Ed. centuries Grigoriy-Ryabova. - M.: Owls. radio, 1970, S. 195-200.
2. Shirman J. D., Mangos Century. N. Theory and technique of processing of radar information on the background noise. - M.: Radio and communication, 1981, S. 122-123.
3. Patent RU 2154899, 7 H 04 1/64, 20.08.2000 (prototype).
1. The method of formation and compression of the signal, based on the generation of pulses transmitted in a sequence, as well as on the strengthening of the received pulse signal and its subsequent processing, wherein when the transmission signal generation of the next pulse from the third, carried out at intervals, otlichalis who eat summation of pulses, the interval between adjacent pulses is defined as
whereT1- the value of the first order interval;
i is the number of impulse;
s - increment interval, in the particular case of equal pulse duration.
2. The method according to p. 1, characterized in that the generation of pulses operate at the carrier frequency.
3. The method according to p. 1 or 2, characterized in that when forming the signal set is the first in order intervalT10, if the value of s, which determines the increment of the interval between pulses, positive, and if the value of s is negative, set the named parameterwhere N is the number of pulses in the sequence.
FIELD: radio engineering; construction of radio communication, radio navigation, and control systems using broadband signals.
SUBSTANCE: proposed device depends for its operation on comparison of read-out signal with two thresholds, probability of exceeding these thresholds being enhanced during search interval with the result that search is continued. This broadband signal search device has linear part 1, matched filter 2, clock generator 19, channel selection control unit 13, inverter 12, fourth adder 15, two detectors 8, 17, two threshold comparison units 9, 18, NOT gates 16, as well as AND gate 14. Matched filter has pre-filter 3, delay line 4, n attenuators, n phase shifters, and three adders 7, 10, 11.
EFFECT: enhanced noise immunity under structural noise impact.
1 cl, 3 dwg
FIELD: radio engineering for radio communications and radar systems.
SUBSTANCE: proposed automatically tunable band filter has series-connected limiting amplifier 1, tunable band filter 2 in the form of first series-tuned circuit with capacitor whose value varies depending on voltage applied to control input, first buffer amplifier 3, parametric correcting unit 4 in the form of second series-tuned circuit incorporating variable capacitor, second buffer amplifier 5, first differential unit 6, first amplitude detector 7, first integrating device 9, and subtraction unit 9. Inverting input of subtraction unit 9 is connected to reference-voltage generator 10 and output, to control input of variable capacitors 2 and 4. Automatically tunable band filter also has series-connected second amplitude detector 11, second integrating unit 12, and threshold unit 13. Synchronous operation of this filter during reception and processing of finite-length radio pulses is ensured by synchronizer 14 whose output is connected to units 10, 8, and 12. This automatically tunable band filter also has second differential unit whose input is connected to output of buffer amplifier 3 and output, to second control input of variable capacitor of band filter 2.
EFFECT: enhanced noise immunity due to maintaining device characteristics within wide frequency range.
1 cl, 1 dwg
FIELD: radio communications engineering; mobile ground- and satellite-based communication systems.
SUBSTANCE: proposed modulator that incorporates provision for operation in single-channel mode with selected frequency modulation index m = 0.5 or m = 1.5, or in dual-channel mode at minimal frequency shift and without open-phase fault has phase-shifting voltage analyzer 1, continuous periodic signal train and clock train shaping unit 2, control voltage shaping unit 3 for switch unit 3, switch unit 3, switch unit 4, two amplitude-phase modulators 5, 6, phase shifter 7, carrier oscillator 8, and adder 9.
EFFECT: enlarged functional capabilities.
1 cl, 15 dwg
FIELD: electronic engineering.
SUBSTANCE: device has data processing circuit, transmitter, commutation unit, endec, receiver, computation unit, and control unit.
EFFECT: high reliability in transmitting data via radio channel.
FIELD: electronic engineering.
SUBSTANCE: method involves building unipolar pulses on each current modulating continuous information signal reading of or on each pulse or some continuous pulse sequence of modulating continuous information code group. The number of pulses, their duration, amplitude and time relations are selected from permissible approximation error of given spectral value and formed sequence parameters are modulated.
EFFECT: reduced inetrsymbol interference; high data transmission speed.
16 cl, 8 dwg
FIELD: communication system transceivers.
SUBSTANCE: transceiver 80 has digital circuit 86 for converting modulating signals into intermediate-frequency ones. Signal source 114 transmits first periodic reference signal 112 at first frequency. Direct digital synthesizer 84 receives second periodic signal 102 at second frequency from first periodic reference signal. Converter circuit affording frequency increase in digital form functions to convert and raise frequency of modulating signals into intermediate-frequency digital signals using second periodic signal 102. Digital-to-analog converter 82 converts intermediate-frequency digital signals into intermediate-frequency analog signals using first periodic reference signal 112.
EFFECT: reduced power requirement at low noise characteristics.
45 cl, 3 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: mobile radio communication systems.
SUBSTANCE: proposed method and device are intended to control transmission power levels for plurality of various data streams transferred from at least one base station to mobile one in mobile radio communication system. First and second data streams are transmitted from base station and received by mobile station. Power-control instruction stream is generated in mobile station in compliance with first or second data stream received. Power control signal is shaped in mobile station from first power control instruction stream and transferred to base station. Received power control instruction stream is produced from power control signal received by base station; power transmission levels of first and second data streams coming from base station are controlled in compliance with power control instruction stream received. In this way control is effected of transmission power levels of first data stream transferred from each base station out of first active set to mobile station and of transmission power levels of second data stream which is transferred from each base station out of second active set to mobile station.
EFFECT: enlarged functional capabilities.
80 cl, 21 dwg
FIELD: radio engineering.
SUBSTANCE: proposed method and device designed for fast synchronization of signal in wade-band code-division multiple access (WCDMA) system involve use of accumulations of variable-length samples, testing of decoder estimates for reliability, and concurrent decoding of plurality of sync signals in PERCH channel. Receiver accumulates samples required for reliable estimation of time interval synchronization. As long as time interval synchronization estimates have not passed reliability tests, samples are accumulated for frame synchronization estimates. As long as frame synchronization estimates have not passed reliability tests, samples are analyzed to determine channel pilot signal shift.
EFFECT: reduced time for pulling into synchronism.
13 cl, 9 dwg
FIELD: satellite navigation systems and may be used at construction of imitators of signals of satellite navigational system GLONASS and pseudo-satellites.
SUBSTANCE: for this purpose two oscillators of a lettered frequency and of a fixed frequency are used. Mode includes successive fulfillment of the following operations - generation of a stabilized lettered frequency, its multiplication with an oscillator's fixed frequency and filtration of lateral multipliers with means of filters of L1 and L2 ranges and corresponding option of a fixed and a lettered frequencies.
EFFECT: reduces phase noise and ensures synthesizing of lettered frequencies of L1 and L2 ranges of satellite navigational system from one supporting generator at minimum number of analogous super high frequency units.
3 cl, 1 dwg