EP0769673B1 - Method and device to program time fuses for projectiles - Google Patents

Description

The invention relates to a method and a device for programming of time fuses of projectiles, one of which determines the time of ignition Dismantling time of a floor is calculated and in the form of a multi-bit programming word from a transmitter coil to one provided on the floor Receiving coil is transmitted.

With the European patent application 0 300 255 a device has become known which has a measuring device for the projectile velocity arranged at the mouth of a gun barrel. The measuring device consists of two ring coils arranged at a certain distance from one another. When a projectile passes through the two ring coils, a pulse is generated in short succession in each ring coil due to the change in the magnetic flux that occurs. The pulses are fed to evaluation electronics, in which the projectile speed is calculated from the time interval between the pulses and the distance between the ring coils. In the direction of movement of the projectile, a transmitting coil is arranged behind the measuring device for the speed, which co-operates with a receiving coil provided in the projectile. The receiving coil is connected to a counter via a high-pass filter, which is connected on the output side to a timer. A time value is formed from the calculated bullet speed and a distance to a target object determined in some other way, which is inductively transmitted to the bullet immediately after the measuring device has flown through. The time fuse is set with the time value so that the projectile can be dismantled in the area of the target object. The time value is transmitted in digital form from the transmitting coil to the receiving coil, at least one 12-bit programming word being required because of the required accuracy. Since in this device the bullet flies through the transmitter coil at high speed (for example approx. 1200 meters per second) and the coil length is limited, the 12-bit programming word must be transmitted at the right time and at a relatively high frequency. The high frequency is achieved in that the pulses of the 12-bit programming word are double pulses, which means that the dead time between the individual signals can be significantly reduced.

To meet the high requirements of the device described above to become, are a fast computer and others for their realization extensive hardware required, resulting in relatively high system costs result. The electronics in the floor are with a shock generator for energy generation during bullet acceleration and a relatively expensive one Precision oscillator equipped, which further increases the cost.

A device which serves essentially the same purpose for temperature control of a projectile or for correcting its original temperature control has become known from US Pat . No. 4,022,102 . Here, however, the energy required in the projectile or igniter is not generated in the projectile but is transmitted inductively.

Furthermore, a method and a device are known from US Pat. No. 4,649,796, to temper a projectile or its detonator after it has been fired. in this connection the gun barrel contains a gun barrel coil, which is both the passage the projectile through the weapon barrel as well as the projectile detects information transmitted in connection with the temp time to be set. The bullet contains a receiving coil for receiving this information. This is spaced from the projectile tip, approximately by middle section of the length of the projectile, so that an inductive coupling is excluded from barrel and bullet. The signal of the receiving coil is processed in an internal ignition circuit and for determination the ignition delay used in the igniter, this circuit has an amplifier and a comparator connected downstream of the amplifier.

The invention has for its object a method and an apparatus of to propose the type mentioned at the beginning, for applications with lower Requirements are suitable and less expensive.

This object is achieved by the invention specified in claims 1, 8 and 9 . The disassembly time is calculated from a predetermined muzzle velocity of the projectile and a distance to a target object.

According to the invention, a receiving coil is provided, which has a transmitting coil interacts for the purpose of transmitting the multi-bit programming word. A measuring device arranged at the mouth of the gun barrel is for the muzzle velocity of the projectile is provided. Furthermore, one Comparator circuit provided on the input side with the receiving coil connected and connected to a decoder on the output side. The exit The decoder is connected to a shift register on the output side is related to a first element, which will be described in more detail later is described. A first counter is provided which is connected to a Clock generator and with a second element, which is also more accurate later is described. The first counter is fed through via the receiving coil Start-stop pulses of the measuring device enabled or blocked. On programmable counter is on the input side when the first counter is blocked is connectable to the clock generator and forms a clock signal. The programmable The counter is on the output side via a coaster at the input of a second one Counter is connected, the output side with the first comparator in Connection is established, and that if the counter reading of the second counter is the same with a further predeterminable counter reading occurs at the output of the first Comparator an ignition signal.

In a first embodiment of the device, the first element is a first Comparator and the second element a programmable counter. The clock signal is intended for the control of the ignition timing and the further counter reading is the state of the shift register corresponding to the disassembly time.

In a second embodiment of the invention, the first element is the programmable one Counter and the second element is formed by the first comparator. The clock signal is intended for the second counter, and for the further one Meter reading is the status of the first meter.

The advantages achieved with the invention can be seen in that by the proposed Calculation of the disassembly time using a predetermined muzzle velocity and transferring the disassembly time to the floor before its launch, a simpler and less expensive device can be realized for weapons with lower bullet speeds is more appropriate. In contrast to the prior art mentioned above no external muzzle velocity measuring system and no more expensive Processor required to correct the programmed disassembly time, as well as the Programming fault due to signals from the measuring coils for the muzzle velocity calculation avoided. Instead of a precision oscillator, which has to be tuned exactly to a certain frequency the device according to the invention a clock generator with good short-term stability, that doesn't need to be matched. According to the device State-of-the-art shock generator is not required because the energy for the power supply of the timer is transmitted inductively.

Fig.1

ein Blockschaltschema der erfindungsgemässen Vorrichtung,

Fig.2

ein Schaltschema eines Teiles der Vorrichtung,

Fig.3

einen programmierbaren Zähler der Vorrichtung,

Fig.4

eine Korrekturschaltung der Vorrichtung,

Fig.5a

ein Diagramm des Verlaufes einer Ladespannung für Kondensatoren und einer Versorgungsspannung,
b ein Diagramm der Lage eines Programmierfensters,
c ein Diagramm der Lage eines Zündsignals für eine Treibladung,

Fig.6a

ein Diagramm des Spannungsverlaufes von Start-Stoppimpulsen an einer Empfangsspule,
b ein Diagramm der Ausgangssignale eines Komparators bei Auftreten der Start-Stoppimpulse,
c ein Diagramm der invertierten Ausgangssignale gemäss Fig.6b,
d ein Diagramm der Zeitdauer der Messung einer Mündungsgeschwindigkeit,

Fig.7

ein erstes Flussdiagramm einer Ablaufsteuerung,

Fig.8

ein zweites Flussdiagramm der Ablaufsteuerung der Vorrichtung, und

Fig.9

ein Blockschaltschema einer zweiten Ausführung der Vorrichtung.

The invention is explained in more detail below using an exemplary embodiment in conjunction with the drawing. Show it :

Fig.1

2 shows a block circuit diagram of the device according to the invention,

Fig.2

a circuit diagram of a part of the device,

Figure 3

a programmable counter of the device,

Figure 4

a correction circuit of the device,

5a

1 shows a diagram of the profile of a charging voltage for capacitors and a supply voltage,
b a diagram of the position of a programming window,
c shows a diagram of the position of an ignition signal for a propellant charge,

6a

2 shows a diagram of the voltage profile of start-stop pulses on a receiving coil,
b is a diagram of the output signals of a comparator when the start-stop pulses occur,
c is a diagram of the inverted output signals according to FIG. 6b,
d is a diagram of the duration of the measurement of a muzzle velocity,

Figure 7

a first flow chart of a sequence control,

Figure 8

a second flow chart of the sequential control of the device, and

Figure 9

a block diagram of a second embodiment of the device.

In FIG . 1, 1 denotes a first counter, which is connected to a clock generator 2 and a programmable counter 3 described in more detail with reference to FIG . The first counter 1 can be released or blocked for the muzzle velocity by start-stop pulses of the coils of a measuring device which has become known, for example, from EP-A-0 300 255 . The programmable counter 3 is connected on the input side to the clock generator 2 and on the output side via a coaster 4 at the input of a second counter 5, which is connected on the output side to a first comparator 6 . A comparator circuit 7, on the input side of which a 12-bit programming word representing a disassembly time T is supplied, is connected on the output side to a decoder 8 , the output of which is connected to a shift register 9 . The shift register 9 is connected to the first comparator 6 , at the output of which, when the level of the second counter 5 and the 12-bit programming word are the same, an ignition signal symbolized by an arrow Z appears in the shift register 9 .

According to FIG. 2 , a reception coil 11 is provided, which interacts with a transmission coil 12 arranged in a loading space of a gun barrel. The reception coil 11 is followed by a high-pass filter 13 which, for example, consists of four individual high-passes. The reception coil 11 is connected to the comparator circuit 7 (FIG . 1) via the high-pass filter 13 . The comparator circuit 7 consists of two comparators V1, V2, the inputs of which are connected to the high-pass filter 13 via a voltage divider consisting of four resistors R1, R2, R3, R4 . By means of the voltage divider, the input voltage of the comparators V1, V2 induced in the receiving coil 11 can be set to a certain level when a control signal b1 (FIG. 7) occurs. The outputs of the comparators V1, V2 are connected to inputs of AND gates 14, 15 each having two inputs, the other inputs of which can be supplied with a control signal b3 for the release of the comparator outputs and the outputs of which are connected to inputs of the decoder 8 . Another comparator V3 is connected on the input side via the resistor R2 of the voltage divider to the receiving coil 11 . The output of the further comparator V3 is connected via an inverter 16 and a further two-input AND gate 17 to the clock connection of a D flip-flop 18 , the data input D1 of which is connected to its complementary output Q1 ' . The clock connection of the D flip-flop 18 can be enabled by means of a control signal a2 supplied to the second input of the further AND gate 17 . At the outputs Q1, Q1 'of the D flip-flop 18 , signals derived from the start-stop signals of the measuring device for the muzzle velocity occur, by means of which the first counter 1 can be released or blocked (control signal a3, FIG. 3). A control counter 26 is connected to a clock output CP of the decoder 8 and checks the number of bits of the programming word to be transferred into the shift register 9 . The outputs of the control counter 26 are connected to inputs of an AND gate 27 , at the output of which a control signal c5 which indicates the complete transmission of the programming word occurs. 28 and 29 denote the coils of the above-mentioned muzzle velocity measuring device arranged at the muzzle of a gun barrel, which co-operate with the receiving coil 11 when a projectile is fired.

Three capacitors 22 , each connected in series with a rectifier 21 , are connected to a further receiving coil 19, which interacts with a further transmitting coil 20 arranged within the loading space of the gun barrel. The capacitors 22 serve to supply power to the electronics and supply the energy required for the ignition, for which purpose they are charged to the further transmitter coil 20 by briefly applying an alternating voltage of 20 kHz, for example, before firing. 23, 24, 25 are three switches, for example in the form of Mosfets, which are connected via a stabilizer circuit, not shown, to the one capacitor 22 serving for the power supply. The voltage divider or the three comparators V1, V2, V3 can be switched to voltage by means of the control signals b1, b2, b6 supplied via the gate connections of the switches 22, 23, 24 .

According to FIG. 3 , the programmable counter 3 consists of a third counter 30 and a second comparator 31. The outputs of the third counter 30 are connected to inputs of the second comparator 31 , which has further inputs, each having a gate arrangement 32 with outputs of the first Counter 1 are connected. The gate arrangement 32 consists of three NAND gates 33, 34, 35, each having two inputs, the outputs of the first two NAND gates 33, 34 being connected to the inputs of the third NAND gate 35 , the output of which is connected to the relevant input of the second comparator 31 is connected. The one input of the first NAND gates 33 is supplied with predetermined levels L or O forming a counter reading A , while the other inputs are supplied with a control signal a7 generated by a correction circuit described in more detail below with reference to FIG . The inputs of a second NAND gate 34 are connected to respective outputs of the first counter 1, while the other inputs to a complementary control signal a7 control signal is supplied to a7 '. The clock inputs CP of the counters 1 and 30 are connected to outputs of AND gates 36, 37 each having two inputs, the one inputs of which are connected to the clock generator 2 (FIG . 1) . Control signals a3 and a6 are supplied to the other inputs, so that counters 1, 30 can be enabled or disabled. The output of the second comparator 31 is connected to the coaster 4 (FIG. 1) and, via a further two-gate AND gate 38, to the reset connection ® of the third counter 30 . A control signal a1 can be fed to the other input of the further AND gate 38 in order to reset the third counter 30 . The carry connection of the first counter 1 is connected to the clock connection of a JK flip-flop 39 , at the output Q 'of which a discharge signal for the capacitors 22 can occur.

In FIG. 4 , 40 and 41 denote a third and fourth comparator, at the inputs of which the counter reading B of the first counter 1 is present. The third comparator 40 is connected via further inputs to the outputs of a first memory element 42 , in which a lower limit value C is stored. The fourth comparator 41 is connected via further inputs to the outputs of a second memory element 43 , in which an upper limit value D is stored. The outputs of the comparators 40, 41 are connected to the inputs of an OR gate 44 , the output of which is connected to the set input of an RS flip-flop 46 via a two-input NAND gate 45 . A control signal a4 can be fed to the second input of the NAND gate 45 . The output of the RS flip-flop 46, at which the control signal a7 can occur, is connected to the gate arrangements 32 (FIG . 3) as not shown.

According to Figure 5a, 5b and 5d, the horizontal axis of time and the vertical axis the voltage UC across the capacitors 22 or the supply voltage VDD t of the electronic components of the device associated. PF is a programming window, PW is the 12-bit programming word occurring in the PF programming window and b7 is a control signal for igniting a propellant charge.

6a, 6b, 6c and 6d, the horizontal axes are assigned to time t and the vertical axes to supply voltage UDD. Us is the threshold voltage of the comparator V3, UDD / 2 is half the supply voltage and TS is the clock signal present at the clock connection of the D flip-flop 18 . MZ is the signal appearing at the output Q1 of the D flip-flop 18 between the start-stop pulses, which represents the duration of the measurement of the muzzle velocity. As usual, O and L mean logic levels.

In the Figure 9, in contrast to Figure 1, the first counter is 1 instead of the programmable counter 3 is connected to the first comparator 6 and the shift register 9 output side instead of on the first comparator 6 is connected to the programmable counter. 3 As not shown, the outputs of the first counter 1 are connected via the gate arrangements 32 (FIG. 3) to inputs of the first comparator 6 , so that the latter either has the counter reading B of the first counter 1 or the predetermined counter reading A (FIG. 3). can be supplied. The outputs of the shift register 9 are connected to the further inputs of the second comparator 31 (FIG. 3) of the programmable counter 3 , which, similarly as described below for FIG. 1 , by dividing the clock generator frequency by the content of the shift register 9, a clock signal for the second counter 5 forms. If the counter readings A and B of the first counter 1 and the counter readings of the second counter 5 are identical, the first comparator 6 generates the ignition signal Z.
It should also be noted that for the circuit according to FIG. 9 , in contrast to FIG. 1, the output frequency f ₀ 'of the programmable counter 3 is proportional to the oscillator frequency f ₀ .

The device described above works as follows:

Before the projectile is fired, the target distance s is measured and the disassembly time T (projectile flight time) is determined on the basis of a predetermined muzzle velocity vo of, for example, 300 meters per second. The capacitors 22 are then charged via the rectifiers 21 by briefly applying the alternating voltage of approximately 20 kHz to the further transmission coil 20 (FIG. 2), the high-pass filter 13 damping the charging signal to such an extent that the comparators V1 connected to the reception coil 11 , V2 cannot respond. At a voltage UC of approx. 18 to 20 volts, the stabilizer circuit is switched on and the clock generator 2 and a sequence control, the most important steps of which can be seen in the flow diagrams according to FIGS. 7 and 8 , begin to work (time I , FIG . 5a ). At approximately the same time, the voltage divider R1 to R4 is raised to half the supply voltage by the control signal b1 and the two comparators V1 and V2 are switched on by the control signal b2 (FIG. 2). Immediately afterwards, the inputs of the decoder 8 are released by the control signal b3 and the programming window PF is formed (FIGS. 2, 5b).

Thereafter, the decomposition time T in the form of a 12-bit programming word is transmitted bit-by-bit from the transmitting coil 12 to the receiving coil 11 and fed to the shift register 9 via the comparator circuit 7 and the decoder 8 . Here, the control counter 26 sums up the twelve clock pulses of the decoder 8 or the shift register 9 required for the complete transmission, the control signal c5 occurring at the output of the AND gate 27 , by which a control signal b5 is generated for blocking the inputs of the decoder 8 (Time II, Fig.5b, Fig.2 ). A control signal b6 is then generated and the power supply to the comparators V1 , V2 is switched off. If the control counter 26 counts fewer or more than twelve clock pulses, an asynchronous counter ( not shown ) started at time I (FIG. 5b) continues until the transfer and the programming window PF is activated by the control signal b3 until the transfer (time III, FIG. 5b ) held open, the hold-open time being, for example, 128 milliseconds. With this relatively long time it is achieved that the transmission time of the 12 bit programming word PW, which is considerably shorter in time, can fluctuate within wide limits. If no or only an incomplete programming word is transmitted during the 128 milliseconds, the capacitors 22 are discharged by the carry signal of the asynchronous counter, so that the grenade can be safely removed from the gun barrel.

After the inputs of the decoder 8 have been blocked and the comparators V1 , V2 are switched off by the control signals b5 and b6, the control signal b7 is generated (FIG. 5c), by means of which the propellant charge of the projectile is ignited and the projectile is fired. Immediately thereafter, the control signal a2 releases the blocking of the output of the comparator V3 or of the clock connection of the D flip-flop 18 (FIG. 2). When flying through the measuring device for the muzzle velocity, a start and a stop pulse are generated in quick succession, which are transmitted from the coils 28, 29 to the receiving coil 11 and are fed to the further comparator V3 previously switched on with the control signal b6. The comparator V3 generates from the start.

Stop pulses when the threshold voltage Us is exceeded or undershot. Rectangular pulses which are inverted by the inverter 17 to the clock signal TS for the D flip-flop 18 (FIGS. 6a, 6b, 6c, 2). The initially specified level O at the output Q1 of the D flip-flop 18 goes to L on a positive edge of the clock signal TS (FIG. 6d), as a result of which the control signal a3 is generated and the first counter 1 is started, which is now that of the clock generator 2 supplied clock pulses summed. When the stop pulse and the second positive edge of the clock signal TS occur , the level of the output Q1 goes back to 0 (FIGS. 6c, 6d). This generates the control signal a4, by means of which the clock input of the D flip-flop 18, the output of the comparator V3 and the clock input CP of the first counter 1 are blocked again by the disappearance of the control signal a3 .

The number N1 clock pulses summed in the first counter 1 results from the relationship N1 = (fo * do) / vo, where fo denotes the clock generator frequency, do the distance between the coils of the measuring device and vo the predetermined muzzle velocity. For example, if you set fo = 300 kHz, do = 0.15m and vo = 300m / sec, you get N1 = 150. Since the measured muzzle velocity can deviate from the predetermined muzzle velocity vo, the summed number N1 clock pulses must be corrected. For this purpose, the counter reading B of the first counter 1 is fed to the third and fourth comparators 40, 41 of the correction circuit (FIG. 4) and compared with the limit values C, D stored in the memory elements 42, 43 . If the counter reading B is in a range determined by the limit values, no correction takes place. However, if the lower limit value C is undershot or the upper limit value D is exceeded, the control signal a7 appears at the output of the RS flip-flop 46 (FIG. 4). This causes the counter reading A corresponding to N1 = 150 clock pulses at the inputs of the NAND gates 33 of the gate arrangement 32 to be transmitted to the second comparator 31 instead of the different counter reading B of the first counter 1 (FIG. 3). In the event of very large deviations, the first counter 1 generates a carry signal, by means of which the capacitor 22 is discharged via the JK flip-flop 39 (FIG. 3). Due to this measure, the cartridge can be safely discharged if the muzzle velocity is zero (ignition failure).

After the transmission of the counter reading A or B of the first counter 1 to the second comparator 31 , the third counter 30 is started by a control signal a6 . This now sums up the clock pulses supplied by the clock generator 2 , the second comparator 31 each generating a signal when the level of the third counter 30 and the counter status A or B are the same, with which the third counter 30 is reset via the AND gate 38 ( Figure 3). In this way, the clock generator frequency fo is divided by the number N1 clock pulses and a clock signal of the frequency fo '= fo / N1 is generated, which is fed to the second counter 5 via the coaster 4 (FIG. 1). With the above-described correction of the muzzle velocity, the frequency fo 'becomes proportional to v ₀ , so that the product of the predetermined muzzle velocity vo and the calculated disassembly time T remains constant. If the level of the second counter 5 and the 12-bit programming word in the shift register 9 are identical, the first comparator 6 generates the ignition signal Z, whereby the projectile is disassembled. If the first comparator 6 does not emit an ignition signal Z, the carry signal of the second counter 5 triggers the ignition, the projectile self-destructing after 8.190 seconds with a 13-digit second counter 5 selected and a clock frequency of approximately 1 kHz.

LIST OF REFERENCE NUMBERS

1

First counter

2

clock generator

3

Programmable counter

4

coaster

5

Second counter

6

First comparator

7

comparator circuit

8th

decoder

9

shift register

11

receiving coil

12

transmitting coil

13

High Pass Filter

14

AND gate

15

AND gate

16

inverter

17

AND gate

18

D flip-flop

19

receiving coil

20

transmitting coil

21

rectifier

22

capacitors

23

switch

24

switch

25

switch

26

Card Reader

27

AND gate

28

Kitchen sink

29

Kitchen sink

30

Third counter

31

Second comparator

32

gate array

33

NAND gate

34

NAND gate

35

NAND gate

36

AND gate

37

AND gate

38

AND gate

39

JK flip-flop

40

Third comparator

41

Fourth comparator

42

First memory element

43

Second storage element

44

OR gate

45

NAND gate

46

RS flip-flop

Z

ignition signal

V1

comparator

V2

comparator

V3

comparator

A

Meter reading, (predetermined)

B

meter reading

c

Lower limit

D

upper limit

PF

programming window

PW

programming word

Us

threshold

TS

clock signal

MZ

Signal (measurement time)

bo .... b7

control signals

a1 .... a7

control signals

Claims (21)

1. A method of programming a time fuse of a projectile,
   wherein

   a time of detonation (T) of the projectile is calculated which determines the firing time, and

   said time of detonation (T) is inductively transmitted to the projectile in the form of a multi-bit programming word,

   characterised in that

   a predetermined muzzle velocity (v₀) of the projectile and

   a predetermined distance (s) to a target object are used

   to calculate the time of detonation (T),

   that the energy for the power supply of the projectile is transferred thereto before the launch of the projectile, and

   that during the launch of the projectile

   an actual muzzle velocity (v₀') is measured,

   the actual muzzle velocity (v₀') is checked for divergence from the predetermined muzzle velocity (v₀), and

   the calculated time of detonation (T) is corrected to a corrected time of detonation (T') so that the product (v₀' * T') of the measured actual muzzle velocity and the corrected time of detonation is constant and is equal to the product (v₀ * T) of the predetermined muzzle velocity and the calculated time of detonation.
2. A method according to claim 1,
   characterised in that
   a clock signal for
   controlling the firing time is derived from the measured muzzle velocity (v₀'), the frequency (fo') of which signal is proportional to the muzzle velocity (v₀').
3. A method according to claim 1,
   characterised in that
   the transmitted energy for the power supply is stored in capacitors (22).
4. A method according to claim 3, wherein the multi-bit programming word is stored in a shift register (9) after transmission,
   characterised in that
   the number of clock pulses corresponding to the number of bits of the multi-bit programming word is calculated on the input thereof into the shift register (9) and if the number of counted clock pulses is larger or smaller the power supply is discontinued by discharging the capacitors (22).
5. A method according to claim 2, wherein the resultant muzzle velocity is calculated from the relationship vo=(do*fo)/N1, and wherein

   do

   denotes a measured distance measured by a measuring device,

   fo

   denotes a clock generator frequency, and

   N1

   denotes a number of clock pulses counted during the time of flight of the projectile given by the measured distance,

   characterised in that
   the frequency (fo') of the clock signal is generated by dividing the clock generator frequency (fo) by the counted number (N1) of clock pulses.
6. A method according to claim 5,
   characterised in that
   the frequency (fo') of the clock signal is reduced.
7. A method according to claim 5,
   characterised in that
   when there are differences of the measured muzzle velocity from the predetermined muzzle velocity (vo) which fall below a lower limiting value (C) or which exceed an upper limiting value (D) a number (N1) of clock pulses which corresponds to the predetermined muzzle velocity (vo) is used for generating the clock signal.
8. An apparatus for carrying out the method according to claim 1, wherein a receiver coil (11) is provided which cooperates with a transmitter coil (12) for the purpose of transmitting the multi-bit programming word, and wherein a measuring device is provided which is disposed at the muzzle of the gun barrel for measuring the muzzle velocity of the projectile,
   characterised in that

   a comparator circuit (7) is provided, the input of which is connected to the receiver coil (11) and the output of which is connected to a decoder (8),

   the output of the decoder (8) is connected to a shift register (9), the output of which is connected to a first comparator (6),

   a first counter (1) is provided which is connected to a clock generator (2) and a programmable counter (3), wherein the first counter (1) is released or locked via start-stop pulses supplied via the receiver coil (11),

   the count of the first counter (1) is transmitted to the programmable counter (3), the input of which can be connected to the clock generator (2) when the first counter (1) is locked and which forms a clock signal for controlling the firing time,

   and

   that the output of the programmable counter (3) is connected via a reducer (4) to the input of a second counter (5), the output of which is connected to the first comparator (6), wherein when there is equality between the count of the second counter (5) and the status of the shift register (9), which corresponds to the time of detonation (T), a firing signal (Z) is emitted at the output of the first comparator (6).
9. An apparatus for carrying out the method according to claim 1, wherein a receiver coil (11) is provided which cooperates with a transmitter coil (12) for the purpose of transmitting the multi-bit programming word, and wherein a measuring device disposed at the muzzle of a gun barrel is provided for measuring the muzzle velocity of the projectile,
   characterised in that
   a comparator circuit (7) is provided, the input of which is connected to the receiver coil (11) and the output of which is connected to a decoder (8),

   the output of the decoder (8) is connected to a shift register (9), the output of which is connected to a programmable counter (3),

   a first counter (1) is provided which is connected to a clock generator (2) and a first comparator (6), wherein the first counter (1) is released or locked by start-stop pulses from the measuring device which are supplied via the receiver coil (11),

   the output of the programmable counter (3) is connected via a reducer (4) to the input of a second counter (5), the output of which is connected to the first comparator (6),

   when the first counter (1) is locked, the input of the programmable counter (3) can be connected to the clock generator (2) and forms a clock signal for the second counter (5), and

   that when there is equality between the counts of the first and second counters (1, 5) a firing signal (Z) is emitted at the output of the first comparator (6).
10. An apparatus according to claims 8 or 9,
    characterised in that
    the comparator circuit (7) consists of two comparators (V1, V2), the inputs of which are connected via a voltage divider and a high-pass filter (13) to the receiver coil (11) and the outputs of which are connected to inputs of two AND gates (14, 15) which each have two inputs, wherein the outputs of the AND gates (14, 15) are connected to the decoder (8).
11. An apparatus according to claim 10,
    characterised in that
    a control counter (26) is connected to a clock output (CP) of the decoder (8) which is connected to the shift register (9), the outputs of which control counter are connected to inputs of an AND gate (27), at the output of which the complete transmission of the control signal (c5) occurs which indicates the multi-bit programming word.
12. An apparatus according to claims 8 or 9,
    characterised in that

    the input of a further comparator (V3) is connected to the receiver coil (11) via a resistor (R2) of a voltage divider,

    the output of the further comparator (V3) is connected, via an inverter (16) and an AND gate (17), to the clock terminal of a D flip-flop (18), the data input (D1) and complementary output (Q1') of which are connected to each other, and

    that signals which are derived from the start-stop signals of the measuring device, which signals are received via the receiver coil (11) and by means of which the first counter (1) can be released or locked, are emitted at the outputs (Q1, Q1') of the D flip-flop (18).
13. An apparatus according to claim 8,
    characterised in that

    the programmable counter (3) consists of a third counter (30) and of a second comparator (31), wherein the outputs of the third counter (30) are connected to inputs of the second comparator (31),

    the second comparator (31) comprises further inputs which are connected to outputs of the first counter (1) via a gate arrangement (32) in each case,

    the output of the second comparator (31) is connected to a reset terminal (R) of the third counter (30),

    and that

    each time there is equality of counts between the first and third counters (1, 30), pulses are emitted at the output of the second comparator (31) which reset the third counter (30) and form the clock signal.
14. An apparatus according to claim 9,
    characterised in that

    the output frequency (f₀') of the programmable counter (3) is proportional to the oscillator frequency (f₀).
15. An apparatus according to claim 13,
    characterised in that

    the gate arrangement (32) consists of three NAND gates (33, 34, 35) which each comprise two inputs, wherein the outputs of the first two NAND gates (33, 34) are connected to the inputs of the third NAND gate (35), the output of which is connected to the respective input of the second comparator (31),

    a predetermined count (A) is supplied to one input of the first NAND gate (33), whilst a first control signal (a7) is supplied to the other inputs, and

    one input of the second NAND element (34) is connected to the respective outputs of the first counter (1), whilst a control signal (a7') which is complementary to the first control signal (a7) is supplied to the other inputs.
16. An apparatus according to claim 15,
    characterised in that

    a third and a fourth comparator (40, 41) are provided, to the inputs of which the count (B) from the first counter (1) is supplied,

    the third and fourth comparators (40, 41) are each connected via further inputs to a memory element (42, 43), wherein a lower limiting value (C) is stored in the first memory element (42) and an upper limiting value (D) is stored in the second memory element (43),

    the outputs of the comparators (40, 41) are connected to the inputs of an OR gate (44), the output of which is connected via a NAND gate (45) to the set input of an RS flip-flop (46), the output of which is connected to the gate arrangements (32), and that

    on undershooting or overshooting the lower and upper limiting values (C, D), respectively, at the output of the RS flip-flop (46), the first control signal (a7) is formed, wherein instead of the count (B) from the first counter (1) the predetermined count (A) is transmitted to the second comparator (31).
17. An apparatus according to claims 8 or 9,
    characterised in that
    a further receiver coil (19) is provided which cooperates with a further transmitter coil (20) disposed inside a loading volume of the gun barrel, wherein three capacitors (22), which are each connected in series to a rectifier (21), are connected to the further receiver coil (19).
18. An apparatus according to claim 17,
    characterised in that
    the capacitors (22) are charged by the short-term application of an alternating voltage of 20 kHz to the further transmitter coil (20).
19. An apparatus according to claim 9,
    characterised in that
    the outputs of the first counters (1) are each connected via a gate arrangement (32) to inputs of the first comparator (6).
20. An apparatus according to claim 19,
    characterised in that

    a third and a fourth comparator (40, 41) are provided, to the inputs of which the count (B) of the first counter (1) is supplied,

    the third and fourth comparators (40, 41) are each connected via further inputs to a memory element (42, 43), wherein a lower limiting value (C) is stored in the first memory element (42) and an upper limiting value (D) is stored in the second memory element (43),

    the outputs of the comparators (40, 41) are connected to the inputs of an OR gate (44), the output of which is connected via a NAND gate (45) to the set input of an RS flip-flop (46), the output of which is connected to the gate arrangements (32), and that

    on undershooting or overshooting the lower and upper limiting values (C, D), respectively, a first control signal (a7) is emitted at the output of the RS flip-flop (46), wherein the predetermined count (A) is transmitted to the first comparator (6) instead of the count (B) of the first counter (1).
21. An apparatus according to claim 9,
    characterised in that
    the outputs of the shift register (9) are connected to inputs of a second comparator (31) of the programmable counter (3).

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