SU1255975A2 - Generator of p-sweep codes for plan-position indicator - Google Patents

Abstract

This invention relates to radar. Symmetric distortions of the geometer, dimensions, and reproducible echoes are eliminated, increasing from the center of the screen to the periphery, in relation to the author. St. No 1030751. The device contains the antenna angle code sensor 1, the NOT 2 electric element, the decoder 3 signs of the cosine of the angle, blocks 4, 5 of controlled inverters, blocks 6, 7 of memory, accumulating accumulators 11, 12, rr 13 clock pulses., Electr. 14, counter 15, trigger 16. The goal is achieved by introducing block 8 of memory and two blocks 9, 10 multiplying. Blocks 9 and 10 perform the operation of multiplying the sinci and coso codes by the coefficient. corrections, 1 ill., 1 tabl .. i (L to

Description

The invention relates to radar, and can be used in indicators of circular vision and is an improvement of the invention according to the authors. St. No. 1030751.

The purpose of the image is to eliminate symmetrical distortions of geometric dimensions, reproducible echoes, increasing from the center of the screen to the periphery.

The drawing shows a structural electrical circuit of the proposed device.

The radial-circle sweep codes generator of the circular view indicator contains an antenna position angle sensor 1 (DLTC), a NOT element 2, a decoder 3 signs of the cosine of an angle, blocks 4 and 5 of controlled inverters, blocks 6–8 of memory, blocks 9 and 10 multiplications, accumulating adders 11 and 12, oscillator 13 clocks, element I 14, counter 15 and trigger 16.

The shaper works as follows.

Sensor 1 receives an n-bit binary code for the angle of the antenna position. The bits from the first to the (n-2) -th code go to blocks 4 and 5, which are controlled by the direct or inverse (n-1) -th bit of the code. The following table is used to determine the sine and cosine signs of the angle.

The table shows that the code of the sign of the sine coincides with the code of the n-th bit of sensor 1. To obtain the code of the sign of the cosine, it is necessary to construct a decoder 3 that implements the following logical equation:

Y Х1ЛХ2УХ1ЛХ2 „

where XI is the code of (n-l) -ro bit Yes, BKUP 1, X2 is the code of the n-th bit Yes, BKUP 1,

Thus, the code of the sign of the sine arrives at the first output of the imager, and the code of the sign of the cosine of the angle reaches the second output.

Blocks 4 and 5 serve to form a direct or inverse value.

 R

1 ni,

the antenna angle code is from O to 90 °, which ensures the formation of the sinot and cosoi code at the outputs of blocks 6 and 7 in the range of 0-180 °. Blocks 4 (5) contain (p-2) controlled inverters, for information inputs of which the corresponding sensor discharge 1 is fed, and control inputs are direct (for block 4) or inverse (for block 5) code ( nl) sensor bit 1. Inverting (nl) -ro bit is performed by the HE element 2.

Blocks 4 and 5 operate in accordance with the following expression:

if the code is (n-1) О if the code is (n-) 1, where Z is the output code value of block 4 (5);

P . - the code value of the i-ro bit of the sensor at the information input;

(n-1) is the code value of the (n-1) th digit of the sensor at the control input,

Accordingly, the logical O in (nl) -M code bit determines the transmission to the address inputs of block 6 of the direct antenna position angle code, and the control signal from the output of the HE element 2: ensures the formation of an inverse angle code at the input of block 7 - In block 6, the sine codes are stored, and in block 7, the cosine codes of the angles from 0 to do.

i Block 6 stores the values of the correction factor codes, which take into account the dependence of the distortions of the original geometrical dimensions of the echo signals from the distance to the center of the screen. The values of the correction factor are determined by the specific type of cathode ray tube. For a flat screen case, its value is

t, 1 +

where is the angle of deflection of the scanning beam from the central axis of the cathode ray tube. In the case of a raised screen, the coefficient is used.

L

 h (g / 1 - 1) COS - G

where r is the radius of curvature of the screen; - radius of deflection of the beam. Blocks 9 and 10 perform the operation of multiplying the sinai and cos oi codes by the correction factor. Accumulating adders 11 and 12 are designed to convert received from blocks 9 and

10 corrected values of CSP and coSoC in a series of elementary increments of coordinate values, which ensure the movement of the beam of the electron-beam tube along the radius of the electron-beam tube during the forward course of the sweep.

For generating radial-circular codes, the device contains a generator 13, an element I 14, a count 15, a trigger 16, the frequency (f) of a generator 13 is determined by the ratio

m m -c 10

° aj-.IO-2-D ,,, where c is the propagation velocity

electromagnetic waves in the air;

max maximum display distance of the circular view indicator on the screen; R". - sweep duration; (k is the counter size of the counter 15, which is chosen based on various factors: the resolution of the cathode ray tube, the diameter of the electron spot, the diameter of the cathode ray tube, etc.)

The start pulse from the driver input enters the setup input of the trigger 16 and sets it to one state. The signal from the output of the trigger 16 permits the passage of clock pulses from the generator 13 through the AND 14 element to the counting input of counter 15 and the clock inputs of accumulating adders II and 12. Counter 15 provides the counting of pulses during the forward sweep stroke.

From the outputs of blocks 6 and 7, the values of the codes sinot and cosoi are received, respectively, at the inputs of the first factors of blocks 9 and 10. The values of the code of the correction factor enter the inputs of the second factors of blocks 9 and 10 from the output of block 8. The products of these inputs from the outputs of blocks 9 and 10 are fed to the information inputs of accumulating adders 11 and 12, With each pulse of the radial sweep coming from the output of the element And 14

VNIIPI Order 4820/46 Circulation 728 Subscription Proizv.-poly. p-tie, Uzhgorod, st. Project, 4

559754

to the clock inputs of accumulating adders 11 and 12, the corrected sin codes (cosc) are summed with the codes accumulated in the process of the 5 arrivals of the preceding pulses.

The overflow pulse (the signal from the t-th digit of counter 13) is the pulse of the end of the display of the maximum sweep range and zeroes the accumulating adders II and 12. The signal from the t-th bit of the counter 15 also goes to the reset input of the trigger 16 and sets it to the zero state, which prohibits the arrival of 15 clock pulses from the generator 13 to the synchronizing inputs of accumulating adders II and 12 and the counting input of counter 15. With the arrival of the next starting pulse, the cycle of generating 20 radial-circular sweep codes repeats .

Thus, changing the codes at the outputs of accumulating adders 11 and 2 provides a radially circular 25 scan of the beam of the cathode ray tube of the circular view indicator, and the high bit of the code of the antenna position angle and the decoder 3 determine the polarity of the sweep voltages.

thirty

Claims (1)

Invention Formula Shaper codes of radial-circular scan for the indicator of a circular view of aut. St. No. 1030751, characterized in that, in order to eliminate symmetrical distortions of geometric dimensions, reproducible echoes, increasing from the center of the screen to the periphery, a third memory block and two multiplication blocks are inserted into it, the output of the first memory block through the first block multiply connected to the input of the first accumulating adder, the output of the second memory block through the second multiplication unit is connected to the input of the second accumulating adder, t-1 counter outputs are connected to the input of the third memory block, the output of which is connected to the second inputs of the first and second multiplication units.