SU1706003A1 - Sounding signals generator - Google Patents

Abstract

The invention relates to technology and communication and can be used in the construction of Doppler selection systems for moving objects. The aim of the invention is to simplify the device. The device contains a clock generator 1, a binary counter 2, a decoder 3, a switch 4, a key 5, a harmonic oscillator 6, a frequency divider 7 and a Johnson counter 8. Using a serially connected frequency divider 7 and a Johnson counter 8 allows you to simplify the device. 3 il. Yo

Description

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The invention relates to radio engineering and communication and can be used in the construction of dropplerovskih systems for the selection of moving objects.

The aim of the invention is to simplify the device for the formation of probing signals.

Fig. 1 shows a structural electrical circuit of a device for forming sounding signals; FIGS. 2 and 3 are timing diagrams explaining his work.

The device for forming probing signals contains a clock generator 1, a binary counter 2, a decoder 3. a switch 4, a key 5, a generator of 6 harmonic oscillations, a divider 7 frequency and a Johnson counter 8.

The device for forming the probing signal works as follows.

The binary counter 2 is clocked by the pulse sequence Ui (t) (see Fig. 3a) with the Atz repetition period coming from the output of the clock generator 1. For each pulse of the sequence Ui (t), single ones appear at the output of the decoder 3 impulses of duration tz. The operation of binary counter 2 and decoder 3 is illustrated by the timing diagrams shown in FIG. 3a. The control inputs of the comm / tator 4 are pulsed from the output of Johnson's counter 8, which is clocked by the pulse sequence U2 (t) (Fig. 2a, b) formed from the sequence Lh (t) using a frequency divider 7. The repetition period rz of the pulse sequence U2 (t) is equal to rz k Atz, where k is the division factor of the frequency divider 7. For each clock pulse of the sequence LJ2 (t), the unit from the previous bit of the Johnson counter 8 is rewritten to the next one of its bit. After units are set at all sections of the Johnson 8 counter, the Johnson counter is filled with 8 zeroes. As a result of control of switch 4, the pulse duration at its output will be equal to the number of units in the bits of the Johnson counter 8. When the Johnson counter is filled with 8 units, the duration

the pulse at the output of switch 4 varies from L tz to, where N is the number of bits of Johnson's counter 8; when the Johnson counter is filled with 8 zeroes, the pulse duration varies from AtzN to Atz. Moment

transition to the new duration is determined by the repetition period T2 of the sequence U2 (t), set by the frequency divider 7. Thus, the control input of the key 5 receives a pulse PWM

signal (figv, g). The pulse duration varies linearly with a step at a time interval Atz through the interval KA tz. The signal input of the key 5 receives a harmonic oscillation from the output of the generator 6 harmonic oscillations. Thus, a radio signal # (t) having a two-level envelope (FIG. 2 e) with a low

Claims (1)

level of side lobes in the spectrum. The generation of control signals by the switch 4 by means of a serially connected frequency divider 7 and a Johnson counter 8 makes it possible to simplify the device for generating sounding signals. The invention The device for the formation of probe signals, containing a series-connected harmonic generator fluctuations and a key, a clock generator and a switch, characterized in that, in order to simplify the device, a serially connected binary counter and a decoder are introduced and sequentially Johnson's connected frequency divider and counter, the output of which is connected to the control input of the switch, the counting inputs of the binary counter and frequency divider are connected to the clock generator output, the output of the decoder is connected to the signal input of the switch, the output of which is connected to the key control input. U) 9ffi a o a) 0k- i) 20 40 about SHUSHSH tii (t-7 u (t 3 o. 20 4060 v FIG. 2 80 nnnn, nnnni- hipp 60 80 tfai tjat fjai 80 pp Fi.Z