SU1319304A2 - Device for reception of broad-band signals with linear frequency modulation - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to enhance the functionality by receiving and registering wideband signals with combined linear frequency modulation and phase shift keying. The device contains receiver 1, mixers 2, 3, local oscillators 4, 5, compressing filters 6, 7, decisive block 8, frequency detector 9, differential block 10, driver 11 pulses, doubler 12, 13 frequencies , dividers 14, 15 clockwise into Two, phase detector 16 and registration block 17. In mixer 2. 3, the intrapulse filling frequency of the received signal is shifted along the frequency axis to the difference frequency range. The signals from mixers 2, 3 are doubled in frequency, then divided by frequency by two. With the help of frequency detector 9, differentiator unit 10 and pulse generator 11, clock pulses are formed for decision unit 8. Phase detector 16 selects a low-frequency voltage proportional to the law of phase shift manipulation. To achieve the goal, blocks 12-17 are introduced. 1 il. i (L p with so about 4 N

Description

The invention relates to ;, chn (), mozhep D) 1) 1 is used in radio communication and radio telemetry systems and is enhanced by 1) H of the famous invention but auth. St. M 771901.

1-1el of the invention is the distribution of functions, reception capabilities and recording and recording of horizontal signals with combined linear frequency modulation and phase shift control.

The drawing shows a structural electrical circuit of the device.

A device for acquiring njcbandband signal with linear frequency modulation contains receiver I. mixers 2 and 3. heterogeneity 4 and 5, compression filters 6 and 7, solver b; wk 8. frequency detector 9, differentiating unit 10, driver 11 imiulsoy, doublers 12 and 13 frequencies dividers 14 and 15 frequencies into two, phase detector 16 and registration block 1.7.

The device works as follows.

Received flatband signal with combined linear frequency modulation and phase manialation (chirp-FMN)

; 7 ,, (/) and „. co5 | w, / + l. + f (01. ,,

where U ,, (Oh, -, Tc is the amplitude, the carrier frequency

. , - and the duration of the signal; 7 —speed of frequency change;

A / If - frequency deviation; Ф, - (/): 0, l is the manipulated component of the phase, representing the 1, and the law of phase manipulation, moreover, q) (/) const with m „/ (- | -1) t / g and can change by a jump at, i.e., at the boundaries between elementary parcels (/ (1, 2, ..., / V-1); t ", N is the duration and the number of elementary parcels from which the signal Tc is composed (r,. / VT ,,); from the output of receiver 1 goes to the first inputs of mixers 2 and 3. To the second inputs of which, from the outputs of the local oscillators 4 and 5, are supplied with voltage respectively

(UG, (/) UG, - COSCOr,. T

Ur, (/)% coswr /.

In mixers 2 and 3, the intrapulse filling frequency shifts the frequency axis to the difference frequency range.

SU ,, | (/) and ,,, - cos | co ,, | / +

U ,,. (T) Vp.2-COS + + fi, (t),

where u ,, i.-ur i;

y ,, 2 -r / 2UfUr -2;

) f- (Or;

W, (- Wp 2;

0

five

five

0

5 5

0

five

0

K, / (2 - transfer coefficients of mixers 2 and 3.

The signals b ,, i (/) and Up - / (t) are fed to the inputs of frequency doublers 12 and 13, the output of which forms signals

(U | () IrgS05 | 2y ,, | / + 2л7 / + 2фА. (G) 1 U ,, i cos (2 (ivi / + 2nv / -);

L / .(/) u ,, i-cos | 2o) ,,. + 2.nY 4-2cf (0 | and ,, 2-со5 (2 (.) ,, 2 / 4-2 -у /),

where 2f, {/) 0,2l,

in which phase manipulation is already absent. Si | the streams and (1) and J (t) are prone to the inputs of the dividers 14 and 15 of the frequency into two, the output of which is formed by the chirp signals

(y, i (/) u ,, i-cos {(i) pii + Y); b .i (/) Up2-cos (w ,, 2 / -f-Ji; Y /).

which are available respectively to the compression filters 6 and 7.

At the same time, the chirp signals at frequencies w ,, i and w ,, 2 from the outputs of dividers 14 and 15 frequencies by two arrive at the frequency detector 9 and are converted into voltage of the corresponding form. This voltage is applied to the input of the differentiating unit 10, the output of which produces rectangular pulses. At the output of the pulse generator 11, pulses are formed at the instants of time corresponding to the instants of the change in the sign of the slope of the frequency modulation functions of the chirp signals. These pulses, along with information pulses from the outputs of the compression filters B and 7, are fed to the corresponding inputs of the JJ unit 8. They provide clock synchronization when receiving replays. Information transmitted by linear frequency modulation is recorded at the second input of the recording unit 17.

At the same time, the signal U ,, (t from the output of the mixer 2 is fed to the first input of the phase detector 16, to the second input of which signal 6 is supplied as the reference voltage:) (/) from the output of the frequency divider 14 to two. Phase detector 16 is a serially connected multiplier and low pass filter. At the output of the phase detector, a low-frequency voltage is formed.

L / ,, (/) U ,, С05ф (g {/),

where u ,, (: iU pi;

K-phase transfer coefficient

detector,

proportional to the law of phase manipulation. This voltage is applied to the first input of the registration unit 17, where it is recorded.

Thus, the proposed device provides not only broadband signals with linear frequency modulation of the chirp, but also wideband signals with phase shift keying (FMN) and with combined linear frequency modulation and phase shift keying (FM chm-FMN).

Claims (1)

Invention Formula A device for adopting broadband signals with linear frequency modulation according to aut. St. X 771901, distinguished by the fact that, in order to accommodate the functionality by receiving and registering broadband signals with combined linear frequency modulation and phase shift, two frequency doublers, two frequency dividers for two, a block The cip and phase detector register, which is connected to the first input of the Yu.Yu. yugiration, the second input which is connected to the output of the replication unit, with () d each mixer connected to the appropriate compression (| 1, 1 r and the corresponding to the input of the frequency detector) and through a serially connected frequency doubler and frequency divider two, and the output of the corresponding mixer is connected to the first input of the phase detector, the second input of which is connected to the output of the corresponding module. shtela frequency pa two.