SU785822A1 - Device for transmitting and receiving corrections in superlong wave length radionavigational system - Google Patents

Description

(54) DEVICE TRANSMISSION AND ACCEPTANCE AMENDMENTS

IN SUPER SLIDING WAVE RADIO NAVIGATION

one

The invention relates to radion. navigation systems, namely, to systems for transmitting and receiving corrections for radio wave propagation in phase superlong-wave radio navigation systems.

A device for transmitting and receiving corrections in ultra-long-wave radionavigation systems is known. It consists of a ground station containing a receiver of radio navigation system signals and a transmitter, an onboard receiver station containing a receiver of signals of a ground radio station and a receiver of signals of radio navigation system 1

However, the known device has a low noise immunity.

The purpose of the invention is to improve the noise immunity.

For this purpose, the device for transmitting and receiving corrections in ultra-long wave radionavigation systems, consisting of a ground station containing a receiver of radio navigation system signals and a transmitter, an onboard receiver station containing a receiver of signals of a ground station and receiver of signals of a radio navigation system, in the ground of SYSTEMS

the first point is the unit for the initial installation of the phase difference, the unit for calculating the magnitude and the sign of the correction, the unit of comparison, two keys, an inverter, three

5 multivibrator, a counting pulse generator, a counter, a counter-divider and an OR element, while the unit for calculating the magnitude and sign of corrections with its signal input is connected to the output of the indicator, the control input is connected to the output of the initial installation block of the phase difference, the output of the sign of the correction is connected to sequential chain from the first

15 of the key and the first multivibrator and simultaneously with a series of inverters, the second key and the second multivibrator, the output of the correction value is connected to the input of the comparator unit, the other input of which is connected to the output of the counter, the information input of which is connected to the output of the counting pulse generator, and the reset input of the counter on

25 zero through the counter-divider is connected to the output of the generator of counting pulses, the output of the counter-divider is simultaneously connected to another control input of the magnitude and sign of the correction code with the input of the third multivator, the output of the comparator is connected to the control inputs of both keys, the outputs of all three multivibrators are connected to the inputs of the OR element, and a block for analyzing the length of the time interval, a generator of counting pulses, a counter, an element OR, and an adder are inserted into the onboard receiving station, and the block for analyzing the length of the time interval its signal input is connected to the receiver output, the correction value output is connected to the counter reset input, the information input of which is connected to the counting pulse generator, two other outputs of the correction sign are connected to the character inputs of the OR element and the adder, and the first input of the adder is connected to the output counter, the second - with the output of the receiver, and its triggering input is connected to the output of the OR element,

Fig. 1 shows a structural electrical circuit, a ground station of the proposed device; in fig. 2 same, the on-board receiving point of the proposed device.

The device for transmitting and receiving corrections in ultra-long-wave radionavigation systems consists of a ground station containing the receiver-indicator 1 of the signals of the radionavigation system, unit 2 of the initial installation of the phase difference, unit 3 for calculating the magnitude and sign of the correction, generator of 4 counting pulses, counter-divider 5, counter 6, unit 7 comparisons, two keys 8 and 9, inverter 10, first, second and third multivibrators 11-13, respectively, element OR 14, transmitter 15J and the onboard point (see, figure 2) containing the indicator receiver 16 signal ground station, the receiver 17 signals of the radio navigation system, the generator 18 counting pulses, the counter 19, the block 20 analysis of the length of the time interval, the element OR 21, the adder 22.

The device works as follows

In block 2 of the initial installation of the phase difference, the value of the phase difference of superlong-wave (ADD) stations, corresponding to the coordinates of the ground point, is entered. Upon the arrival of a pulse from the output of the counter-divider 5 in block 3 for calculating the magnitude and the sign of the correction, the difference between the reading of the receiver indicator 1 and the content JM of block 2 of the initial sCTaHOBKH phase difference is calculated. At the same time, the contents of counter B are zeroed and the multivibrator 13 is started, form a pulse for the duration of which CC) through the element OR 14, the transmitter 15 is triggered. Next, the contents of counter 6, modified by generator 4, are compared with.

the value of the correction calculated by block 3, and at the moment of equality the comparison block 7 generates a pulse, which is fed to the first inputs of the key 8 and 9,

If the sign of the correction is positive, then a potential 1 acts on the second input of the key 8 and a pulse is generated at the key output that triggers the multivibrator 11, which, in turn, generates a pulse for the duration of which {Su.) The transmitter 15 is started via the OR 14 element. If the sign of the correction is negative, then potential 1 will act on the second input of key 9, and the transmitter 15 will similarly start at time CCj) of the pulse duration of the multivibrator 12. This cycle repeats every T seconds, where T is the capacitance of the divisor counter 5 , T is the period following the generator 4 counting pulses. In each cycle, the transmitter 15 emits two frequency bursts — first, duration C, and after a time proportional to the value of the transmitted correction — a second, duration t, if the sign of the amendment is positive, or duration if the sign of the correction is negative.

When receiving by the receiver-indicator 16 of the frequency sequence radiated by the transmitter 15 of the ground station, the block 20 for analyzing the length of the time interval analyzes the duration of this sequence. The duration of the incoming sequence satisfies the condition:, where At; - the time interval, taking into account the instability of the generators 4 and 18 counting pulses and not at the edges of the frequency sequence, then at t the output of the correction unit of block 20, a pulse is formed, which flushes the contents of counter 19. If the length of the incoming sequence satisfies the condition:

,,

then the impulse is generated at | the output of the magnitude of the correction block 20. This pulse is applied to the sign (positive) input cy of the screw 22 and to one of the inputs of the OR element 21, after which from its output to the adder 22 comes the enabling pulse and the counting of the receiver 17 and the contents of the counter 19 are added. And finally, if the duration of the incoming sequence will satisfy the condition:

S-L {: G C “- ds.

Claims (1)

then a pulse will be generated at the output of the correction value of block 20 and will go to the negative input of the adder 22 and to the second input of the element OR 21; after which the adder 22, triggered by a pulse from the output of the element OR 21, will perform an operation of subtracting the contents of counter 19 from the readout of receiver 17. Thus, in each cycle of the ground station’s operation, the readout of receiver 17’s count with the contents of counter 19 takes place the counter is assigned a plus or minus sign depending on the length of the second frequency sequence, which came to the input of the indicator 16. The content of the counter 19 at the time of the addition is proportional to the time interval between The first and second frequency sequences radiated by the transmitter of the ground station 15 and, therefore, proportional to the magnitude of the transmitted correction. Thus, the proposed estimate has the best noise immunity provided by the introduction of a time length analysis block into the onboard receiving station. The invention of the device for transmitting and receiving corrections in ultra-long wave radionavigation systems, consisting of a ground station containing a receiver of an indicator of signals of a radionavigation system and a transmitter, an onboard receiver point containing a receiver indicator of signals of the ground point of a receiver of the radionavigation system sig- nals, which, in order to increase interferences of the device, a block for the initial installation of the phase difference, a block for calculating the magnitude and sign of the correction, a block equals, two keys, an inverter, three multivibrators, a counting pulse generator, a counter, a counter-divider and an OR element, while the unit for calculating the magnitude and sign of corrections is connected to the output of the receiver indicator by a control input connected to the output of the unit for setting the phase difference , the output of the sign of the amendment is connected to a serial chain of the first key and the first multivibrator and once with a serial chain of the inverter, the second key and the second multivibrator, the output of the correction value with Connected to the input of the comparison unit, the other input of which is connected to the counter output, the information input of which is connected to the output of the counting pulses generator, and the reset input of the counter to zero through the counter-divider is connected to the output of the counting pulses generator, the output of the splitter counter is simultaneously connected to another the control input of the magnitude and correction symbol and with the input of the third multivibrator, the output of the comparator is connected to the control inputs of both keys, the outputs of all three multivibrators are connected to the inputs of this OR, and a block for analyzing the length of the time interval, a generator of counting pulses, a counter, an OR element, and an adder are entered into the onboard receiving point, while the block for analyzing the length of the time interval is connected to the receiver output by its signal input, the output of the correction value is connected to the reset input counter to zero, the information input of which is connected to the generator of counting pulses, the other two outputs of the sign of the amendment, is connected to the sign inputs of the OR element and the adder, the first input of the adder is connected to the output of the counter, the second - with the output of the receiver, and its triggering input is connected to the output of the OR element. Sources of information taken into account in the examination 1. US patent 3803610, cl. 343-105Р, publ. 04/09/74 (prototype). h- T ± J 9iU2J Y 17 - -