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 [1]. 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 [2]. 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 [3].

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).

Claims

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

Ti+1=T1+si,

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.

 

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