SU697938A1 - Azimuth determining device - Google Patents

Description

i

The invention relates to short-range radio navigation and can be used to determine the azimuth of a moving object from radio beacons.

A device for determining an azimuth containing a serially connected clock, a first counter and a memory device, the second input of which is connected to the first output of the receiver and the third input to the output of the second counter, and the second output of the receiver I are connected to the control input of the first counter I.

However, this device has low speed in determining the azimuth shea.

The purpose of the invention is to increase speed.

To do this, the device for determining the azimuth containing serially connected clock generator, the first counter and the storage device, the second input of which is connected to the first output of the receiver, and the third input - to the output of the second counter, the second output of the receiver connected to the control input of the first counter .

A frequency divider is inserted between the clock pulse generator and the counting input of the second counter, the first and second control inputs of which are connected respectively to the second and third outputs of the receiver.

FIG. Figure 1 shows the electrical structure of an azimuth determination device; in fig. 2 - time diagrams that show his work.

The device for determining the azimuth contains 1, the first counter 2, the second counter 3, the generator 4 clock pulses, the divider frequency 5 and the storage device 6.

The positions Ui, U2 and A denote the third, second and first outputs of receiver 1, respectively (the outputs of the first and second reference sequences and the azimuth signal).

The device works as follows.

Claims (3)

On board the moving object, using receiver 1, the azimuth signal A and two periodic pulse sequences, and, and Uj, in which the repetition periods T and Tj are associated with the rotation period T of the radio beacon antenna, are connected by the relation (n-1) T, nTj T, () where n is the number of pulses of the sequence Uj With the help of counters 2 and 3, the time interval At i (i 1,2) between two consecutive pulses of the reference sequences U | and Uj and the interval. Choi (i 1,2) between one of the reference pulses (J 1 or J 2) and the fixation point of the azimuth signal. In this case, the subscript i denotes the sequence number, the pulse of which is taken as the origin. Let the k-th pulse of the sequence DZ (Fig. 2a) be taken as the starting point of the intervals and At .jo, then the interval kT2 (k 1, n), which characterizes the temporal position of the considered pulse Uj relative to the reference point of the azimuth defined by beacon antenna through the north direction, taking into account the expression (1), is equal to kT2 (n - 1) At2 At the same time, the value of the time interval A o, from the time t to the time t, the fixation of the azimuth signal A is determined on the basis of the time interval measurement At2 and Atja according to the formula Atca + (n - 1) At2 (2) If for the beginning from A match for the duration of the intervals, and At-ja take a second pulse of the sequence U | (Fig. 26), then the value of At ;. is determined by the formula Atia + 1 - nAt, (3) If the interval is counted from the pulse of the sequence Uj, and the interval is At. from the next pulse of the sequence Ui (Fig. 2c), then the value. At, determined on the basis of the expression utia + (4) In the opposite case, when the interval At is counted from the pulse of the sequence DI, and At-ja from the pulse of the sequence Uj (fig, 2d), the value of Atcd is determined by the formula At, co, At2a + Т - (п - 1) АТ1 (5) All considered variants of changes in time intervals At; and Atjci characterize the generalized. formula 9 ° (. + J), (6) compiled on the basis of expressions (2) - (5 In expression (6), 9 ° is the value of the measured azimuth value in degrees, and the values of parameters a and t are chosen from the following considerations: t O, of p-1, if i J 2; g T, rf - p, if i J 1; G O, rf n, if i 2, J 1; G T, of - (n-1), if i 1, J 2. From the output of the receiver 1, the pulse U2 is fed to the inputs of counters 2 and 3. At the same time, counter 2 performs counting of pulses coming from clock generator 4 at a frequency. p - 1С °. G1 - g, o T, where A ° is the sampling interval for measuring azimuth in degrees. At the counting input of the counter 3, pulses are received with a frequency FZ n (n - 1) -. which is generally not a multiple of frequency F, the value of the frequency of the RE with an error not exceeding the sampling interval of coarse measurements of counter 3, is obtained by dividing the frequency of FI using frequency divider 5. At the time of receiving the azimuth signal A at the output of receiver 1, a signal is generated by which the contents of counters 2 and 3 are overwritten into memory 6. When this is done, the contents of counter 3 are entered into the higher bits of the storage device 6, and the contents of counter 2 - into younger bits. Thus, the two time intervals are summed: At2 (between the moment of arrival of the pulse Uj and the moment of time and Atao (between the moments of arrival of the pulse DI and the azimuth signal A.). Similarly, the time intervals are measured for the options considered above (Fig. 26 and d Thus, in the proposed device for determining the azimuth, it is possible to shorten the duration of the measurement process by n times compared with the known device, and to eliminate the counter 35 and the northern signal shaping circuit. Invention device for determining the azimuth, containing a serially connected clock generator, a first counter and a storage device, the second input of which is connected to the first output of the receiver, and the third input to the output of the second counter, the second output of the receiver connected to the control input of the first counter, characterized in that, in order to increase the speed, a frequency divider is inserted in it, connected between the clock pulse generator and the counting input of the second counter, the first and second controls n inputs of which are connected respectively to the second and third outputs of the receiver. Sources of information taken into account in the examination 1. Technical description and instructions for operating the Fan-AD system. Azimuth measurement unit. EU2.596.079. TO 1968, p. 5-11, 18, fig. 1.2.