SU1356187A1 - Pulse signal former with intra-pulse code-phase-shift keying - Google Patents

Abstract

The invention relates to radio engineering and provides for the reduction of intrapulse phase and frequency distortions during the formation of linear frequency modulated (LFM) oscillations with intrapulse code-phase manipulation (ICFM). Pulse shaper with ICFM contains shaper 1 of chirp signals, LZ 2, phase discriminator 3, amplifier 4 error signals, Y-circulator 5, keys 6, 9, adder 7, phase shifter, made in the form of a mitro at 8, and shaper the code of phase 10. The output signal of the pulse generator with the signals is the chirp oscillations, divided into discrete samples, at the beginning of which the phase jumps. Correspondingly, it is changed to 7G or 2 in accordance with a specific code. LZ 2 and phase discriminator 3 form a frequency discriminator forming a sawtooth signal, the slope of which is proportional to the rate of change of the chirp frequency of shaper 1. This signal pre-modulates the frequency of oscillation of the mitron 8. As a result of synchronization of the mitron 8, arriving at Y Circulator 5, differing from oscillation of shaper 1 only in amplitude. The oscillations on the other side of the mitron 8 differ from the oscillations of the driver 1 not only in amplitude, but also in phase. In this case, the phase shift of the signals at the mittron outputs is equal to J. The adder 7 forms oscillations, the phase of which is jump-like. but changes to TT. Introduced blocks 1-5. 6 Il. (L 05 SL O5 00 -vl

Description

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The invention relates to radio engineering and can be used to form wideband linear frequency modulated (chirp) signals with intra-pulse code-phase shift keying.

The purpose of the invention is to reduce intrapulse phase and frequency distortions in the formation of linear frequency modulated oscillations with intrapulse code-phase manipulation,

Fig. 1 shows the structural electrical circuit of the proposed pulse signal generator with intrapulse code-phase manipulation; Figures 2 through 6 show temporary diagrams of his work.

Shaper pulse signals with intra-pulse code-phase -. manipulation contains shaper 1 of chirp signals, 2 delay line, phase discriminator 3, error amplifier 4, V-circulator 5, first key 6, adder 7, phase shifter, made in the form of a mitro 8, second key 9, shaper 10 phase code.

The pulse shaper with intra-pulse code-phase manipulation works as follows.

At the output of a pulse wave former with intrapulse code phase manipulation, chirped oscillations of duration D are formed, divided into discrete steps C, at the beginning of each of which the phase changes abruptly by J or 2 / t in accordance with a certain code. For example, a Barker code or an M-code (FIG. 2). The control inputs of the driver 1 and the form-bodies 10 receive a short pulse that triggers them. The duration of the chirp oscillations of the shaper 1 (Fig. 3) and the duration of the phase code formed by the shaper 10 are equal to each other. The oscillations from the shaper 1 output go to the first shoulder of the Y circulator 5, as well as to the input of the phase discriminator 3 directly through line 2 delays that form the frequency discriminator.

From the third shoulder of the Y-one of the 5 torus, the chirp oscillations arrive at the second end of the mitron 8, with virtually no change in its phase and amplitude, i.e.

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practically .the signal shown in fig.Z. At the output of the phase discriminator 3, a sawtooth signal is formed, the slope of which is proportional to the rate of change of the chirp frequency. This signal, after amplification in amplifier 4, is fed to the frequency-controlling input of the mitron 8, by pre-modulating its oscillation frequency according to a linear law. The premodulation of the natural oscillations of the mitron 8 is carried out to expand the dynamic synchronization band to a value equal to the electronic tuning band of the imaging unit 1 of the chirp signals. Due to the pre-modulation frequency The scientific research institute of the mitron 8 differs little from the frequency of oscillations of the former 1 coming through the Y-circulator 5. As a result of synchronization, oscillations of the mitron 8 coming from the second alloy of the mitron 8 to the third shoulder of the U-circulator 5, and from there to the second the shoulder is different from the vibrations of the shaper 1 only in amplitude (Fig. 4). From the first output of the mitron 8, oscillations are removed that differ from oscillations of the imaging unit 1 not only in amplitude but also in the initial phase (Fig. 3). In this case, the phase shift provided by the mithron 8 on the first and second of its conclusions will be exactly equal.

Using the first 6 and second 9 keys, which switch at the moments specified by the driver 10, oscillations are formed at the output of the adder 7 of these oscillations, the phase of which is jump-like after certain time intervals; changes on TG (Fig. 6).

Claims (1)

Invention Formula Pulse signal generator with intrapulse code-phase manipulation containing serially connected first key and adder, serially connected phase shifter and second key, the output of which is connected to the second input of the adder, as well as a phase code generator, the first and second outputs of which are connected respectively to the control the inputs of the first and second keys, differing in that, in order to reduce intrapulse phase and frequency distortions 313561 during the formation of linear-frequency-modulated oscillations with intra-pulse code-phase manipulation, sequentially connected shaper of linear-5 frequency-modulated oscillations, delay line, phase discriminator, the second input of which is connected to the input of the delay line, and signal amplifier are introduced into it interrogators, as well as the Y-cir-O-cooler, the first arm of which is connected to the output of a linear-frequency-modulated oscillator, 874 and the second shoulder is connected to the input of the first key, while the phase shifter is designed as a mitron, the control input of which is connected to the output of the error signal amplifier, the first step is the output of the phase shifter, and the second step of the mitron is connected to the third shoulder of the Y-caliper, and the pilot the input of the linear-frequency modulated oscillator is connected to the control input of the code generator fa 3Z. tftu.Z fi9.5 M nil Mil I and PRI (jpuf.6