JP4627982B2 - Time information pulse generator - Google Patents

Description

  The present invention relates to a time information pulse generator that outputs a time information pulse representing an accurate time based on received time information.

Conventionally, a time information pulse generator that outputs a time information pulse representing an accurate time based on received time information is known (for example, paragraphs [0017] and [0018] of Japanese Patent Laid-Open No. 5-60882). Etc.)

  FIG. 10 shows a configuration of a time information pulse generating system 2 including this type of time information pulse generating device. This time information pulse generation system 2 uses time information transmitted from a time information transmitting station (for example, a standard radio wave transmitting station arranged on the ground or an artificial satellite arranged in the air) 4 as radio waves. 6 is received by the reception processing unit 8 constituting the demodulator 6 to obtain demodulation information.

  The time information detection unit 10 detects the time information t0 from the demodulated information, and configures the pulse generation unit 12 with a time difference DATA1 between the time information t0 and a desired time tset at which the next time information pulse is to be output. Set to counter.

  The counter constituting the pulse generation unit 12 counts the set time difference DATA1 with the internal clock 16 supplied from the reception unit clock generator 14, and outputs the time information pulse 18 at the time of counting up.

  By the way, the transmitting station clock 22 generated by the transmitting station clock generator 20 built in the time information transmitting station 4 and the internal clock outputted from the receiving section clock generator 14 built in the time information pulse generating device 6 are used. (Receiver clock) 16 has an asynchronous relationship in which both the frequency and phase vary independently since oscillators independent of each other are used.

  Further, the propagation delay time between the time information transmitting station 4 and the time information pulse generating device 6 depends on the propagation path and propagation distance, and is an independent element from the transmitting station clock 22 and the internal clock 16. 22 is a real value that cannot be represented by an integer multiple of 22 or the internal clock 16.

  Therefore, conventionally, a method of outputting the time information pulse 18 at the output timing of the internal clock 16 that is closest in time to the time information detected by the time information detector 10 is generally used.

For example,
t0 = time information detected by the time information detector 10;
tset = desired time (ideal time) for setting to the pulse generator 12;
Tclk = cycle of internal clock 16;
Integer (real value) = a function that returns an integer value of a real value in parentheses with a threshold value of 0.5.

  Note that the time is described using the symbol “t” (lowercase t) as an instantaneous value, and the time is described using the symbol “T” (uppercase T) as a period. The time difference DATA1 can be expressed by the following equation (1).

  DATA1 = integer {(tset−t0) / Tclk} (1)

  In this case, the pulse generator 12 counts the number of internal clocks 16 by the value of the time difference DATA1 and outputs a time information pulse 18.

  At this time, the problem is the time accuracy of the output time information pulse 18.

  The time accuracy of the time information pulse 18 will be described with reference to FIG.

  In FIG. 11A, the phase state of the internal clock 16 is the phase state A shown in FIG. 11B with respect to the ideal (exact) time information pulse 18i desired to be generated at the desired time tset. In this case, the time information pulse 18a that is actually output is output at time t1 shown in FIG. 11 (d) in which the internal clock 16 is counted by the value of the time difference DATA1 from the time point when the time information t0 is detected.

  Similarly, when the phase state of the internal clock 16 is the phase state B shown in FIG. 11C, the time information pulse 18b that is actually output is output at the time t2 shown in FIG. Is done.

  As described above, since the internal clock 16 and the time information t0 are asynchronous, the phase states A and B of the internal clock 16 are not obtained intentionally and constantly fluctuate. As shown in FIG. 11 (f), the information pulse 18 is uniformly distributed in a range of ± 1/2 Tclk depending on the cycle Tclk of the internal clock 16 with reference to the ideal time tset. The time accuracy of the time information pulse 18 is limited by the cycle Tclk of the internal clock 16.

  For example, when the oscillation frequency of the internal clock 16 is 10 [MHz], the cycle Tclk is 100 [ns], and the maximum time error is ± 50 [ns].

  On the other hand, it can be easily imagined that the time accuracy of the time information pulse 18 can be improved by increasing the oscillation frequency of the internal clock 16 and shortening the period Tclk, but in this case, the power consumption increases. A new problem occurs.

  For example, when the internal clock 16 is increased to 500 [MHz], the cycle Tclk is Tclk = 2 [ns] and the maximum time error is ± 1 [ns], but the power consumption is 50 proportional to the frequency. It will be doubled.

  The present invention has been made in consideration of such problems, and makes it possible to improve the time accuracy (output accuracy) of time information pulses without increasing the frequency of the internal clock of the time information pulse generator. An object is to provide a time information pulse generator.

  In this section, for ease of understanding, reference numerals in the attached drawings are used for explanation. Therefore, the contents described in this section should not be construed as being limited to those with the reference numerals.

The time information pulse generator (6A) of the present invention includes a reception processing unit (8) that receives time information transmitted from a time information transmitting station ( 4 ), and the time information from the demodulation information obtained by the reception processing unit. A time information detection unit (10) for detecting information, and a pulse generation unit (12A) for outputting a time information pulse ( 18 ) at a time set based on the time information, wherein the pulse generation unit Time measurement that divides the time difference between the time information and the set time into an integer part time difference represented by an integer multiple of the internal clock period and a fractional part time difference represented by a decimal value less than the internal clock period. time division section (30), the synchronous timing unit that measures a resolution of the integer part time difference the internal clock period (32), asynchronous clocking for measuring the fractional part time difference with a resolution of less than the internal clock period Part (34) and have a said synchronous timing unit includes a synchronization timing setting unit which outputs the integer part time difference as the set value (36), the inner the set value set by the synchronization timing setting unit A counter unit (38) that counts in synchronization with a clock; and a count end signal output unit (40) that outputs a count end signal from the counter unit, wherein the asynchronous timer unit outputs the count end signal An analog signal generation unit (42) that outputs an analog signal (54) whose amount of electricity changes with time using the count end signal output from the unit as a trigger signal, and electrical information that converts the fractional part time difference into electrical information A calculation unit (46), an electrical information setting unit (48) for outputting the electrical information obtained by the electrical information calculation unit as a reference value, and an output from the analog signal generation unit. A comparator (44) that compares the analog signal thus generated with the reference value set by the electrical information setting unit and outputs a match signal (56) when the analog signal matches the reference value; characterized by have a pulse shaping unit (50) for outputting as the time information pulse waveform shaping the outputted the coincidence signal from the comparator (the invention according to claim 1).

  According to the present invention, the time difference between the time information and the set time is set to the internal clock cycle, in addition to the synchronous clock unit that measures the time difference between the time information and the set time with the resolution of the internal clock cycle. Since the asynchronous timekeeping section that measures time with a resolution of less than is provided, the time accuracy of the time information pulse can be improved without increasing the frequency of the internal clock of the time information pulse generator. Since the frequency of the internal clock is not increased, an increase in power consumption can be minimized.

Here, the asynchronous timekeeping unit (34B) further includes an analog signal waveform storage unit (60) that stores in advance a waveform of an analog signal whose amount of electricity changes with time, and the electrical information calculation unit (46B). ) Can be configured to refer to an analog signal waveform stored in the analog signal waveform storage unit when converting the fractional part time difference into electrical information (the invention according to claim 2 ). ).

  According to the present invention, the time accuracy (output accuracy) of the time information pulse can be improved without increasing the frequency of the internal clock of the time information pulse generator. Since the frequency of the internal clock is not increased, an increase in power consumption can be minimized.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings to be referred to below, the same reference numerals are assigned to the components corresponding to those shown in FIGS. 10 and 11, and the detailed description thereof is omitted.

  FIG. 1 shows the configuration of a time information pulse generating system 2A according to the first embodiment of the present invention.

  This time information pulse generation system 2A basically has a time information transmission station (for example, a standard radio wave transmission station arranged on the ground or in the air) that transmits accurate time information based on a built-in transmission station clock 22 as a radio wave. 4) and a time information pulse generator 6A that outputs a time information pulse 18 representing an accurate time based on time information t0 received as a radio wave.

  Here, the time information pulse generator 6A basically includes a reception processing unit 8 that receives transmitted radio waves and outputs demodulation information, and a time information detection unit 10 that detects time information t0 from the demodulation information. And an accurate time information pulse 18 based on a time difference (tset−t0) between the time information t0 and a desired time (time set based on the time information) tset at which the time information pulse 18 is to be output next. A pulse generation unit 12A for output, a reception processing unit 8, a time information detection unit 10, and a reception unit clock generator 14 for supplying an internal clock 16 to the pulse generation unit 12A are provided.

  Also in the first embodiment, the transmitting station clock 22 generated by the transmitting station clock generator 20 built in the time information transmitting station 4 and the receiving unit clock generator 14 built in the time information pulse generator 6A. Since an independent oscillator is used for the internal clock 16 output from the above, there is an asynchronous relationship in which both frequency and phase vary independently.

  Further, the propagation delay time between the time information transmission station 4 and the time information pulse generator 6A depends on the propagation path and propagation distance, and is an independent element from the transmission station clock 22 and the internal clock 16, so that the transmission station clock 22 is a real value that cannot be represented by an integer multiple of 22 or the internal clock 16.

  In the first embodiment, the constituent elements other than the pulse generator 12A have substantially the same functions as the constituent elements other than the pulse generator 12 shown in FIG. The configuration and operation of the pulse generator 12A will be described in detail.

  FIG. 2 shows a detailed configuration of the pulse generator 12A. FIG. 3 is a waveform diagram for explaining the operation of the pulse generator 12A.

  The pulse generator 12 </ b> A includes a synchronous timer 32, an asynchronous timer 34, and a time division unit 30. Here, the synchronous timer 32 calculates the time difference tset-t0 between the time information t0 detected by the time information detector 10 and the time tset set based on the time information t0, as the cycle Tclk of the internal clock 16. Time is measured with the resolution of. On the other hand, the asynchronous time measuring unit 34 sets the time difference tset-t0 between the time information t0 detected by the time information detecting unit 10 and the time tset set based on the time information t0 to be less than the cycle tclk of the internal clock 16. Time is measured with the resolution of. The time measuring time division unit 30 multiplies the time difference tset-t0 between the time information t0 detected by the time information detection unit 10 and the time tset set based on the time information t0 by an integral value multiple of the internal clock period Tclk. And the fractional part time difference Dd represented by a decimal value less than the internal clock period Tclk, which is the remainder of the integral part time difference Di, respectively, and the synchronous type time unit 32 and the asynchronous type respectively. It outputs to the time measuring part 34.

For example,
t0 = time information detected by the time information detector 10;
tset = desired time (ideal time) for setting the pulse generator 12A,
Tclk = cycle of internal clock 16;
INT (real value) = a function that returns the integer part of a real value.

  Note that the time is described using the symbol “t” (lowercase t) as an instantaneous value and the time is represented using the symbol “T” (uppercase T) as a period. The time difference tset-t0 supplied from is divided into an integer part time difference Di and a fractional part time difference Dd by the following expressions (2) and (3).

Integer part time difference Di = INT {(tset−t0) / Tclk} (2)
Decimal part time difference Dd = (tset−t0) − (Tclk × Di) (3)

  Next, the synchronous time setting unit 36 of the synchronous time measuring unit 32 sets the integer part time difference Di in the counter unit 38 as a set value.

  The counter unit 38 counts (clocks) the integer part time difference Di, which is a set value, in synchronization with the internal clock 16 as an operation clock. The counter unit 38 can use a digital counter. The count end signal output unit 40 outputs a carry signal or a borrow signal of the digital counter to the asynchronous timer unit 34 as a count end signal (timer end signal) in the counter unit 38. All operations so far are synchronized with the internal clock 16.

  Using the count end signal 52 as a trigger signal (starting point), the analog signal generation unit 42 of the asynchronous timer unit 34 starts operation. The analog signal generation unit 42 outputs an analog signal 54 whose amount of electricity (voltage or current, here, voltage) changes with time. For example, when an integration circuit is used as the analog signal generation unit 42, the voltage obtained when the current is integrated for a certain period of time is expressed by using time as a variable.

  The operation of the asynchronous timer unit 34 will be described with reference to FIG.

  When the internal clock 16 is represented in time series, it is as shown in FIG.

  The count end signal 52 output from the count end signal output unit 40 constituting the synchronous timer unit 32 is a signal synchronized with the internal clock 16 as shown in FIG.

  As shown in FIG. 3C, the analog signal generation unit 42 starts integration from the rising point of the count end signal 52 and outputs an analog signal 54 that is integrated during the high level period of the count end signal 52. Here, an arithmetic expression of the analog signal 54 composed of a positive slope portion is V (t) = at (a is a gradient, and t is a time as a variable).

  The electrical information calculation unit 46 substitutes the decimal part time difference Dd output from the time measurement time division unit 30 in the calculation formula V (t) to obtain the set voltage V (Dd) of the digital data that is the corresponding electrical information, Output to the electrical information setting unit 48.

  The electrical information setting unit 48 sets the set voltage V (Dd) of the digital data to the reference input terminal of the comparator 44 as a reference value that is an analog signal (this sign is also referred to as V (Dd)). The electrical information setting unit 48 can be realized by a D / A converter or the like.

The comparator 44 is realized by a comparator, compares the level of the analog signal 54 supplied to the comparison input terminal with the reference value V (Dd) set at the reference input terminal, and the level of the analog signal 54 is When the reference value V (Dd) is coincident, the coincidence signal 56 shown in FIG. 3 (e) is output, which transitions from the low level to the high level.

  The rising time t3 of the coincidence signal 56 becomes the accurate rising time of the time information pulse 18.

  The pulse shaping unit 50 expands the pulse width to an integral multiple of the internal clock 16 without changing the rising point shown in (f) of FIG. 3 so that the time information pulse 18 can be easily used as a pulse in the subsequent electric circuit. The time information pulse 18 is output.

  In addition, since precise time information is unnecessary at the time of falling of the time information pulse 18, the pulse shaping unit 50 uses a logic circuit such as a digital counter so that the pulse falls, for example, after 10 clocks. A pulse obtained by shaping the coincidence signal 56 is generated.

As described above, according to the first embodiment described above, as shown in FIG. 4, the time information t0 detected from the demodulated information in the reception processing unit 8 and then the desired time information pulse 18 are to be output. When outputting an accurate time information pulse 18i (see (a) of FIG. 4 ) based on a time difference (tset-t0) from a time (a time set based on time information) tset, a time measuring time dividing unit 30 The time difference tset-t0 supplied from the time information detection unit 10 is divided into an integer part time difference Di that is an integral multiple of the internal clock period Tclk and a fractional part time difference Dd that is less than the internal clock period Tclk.

  Then, the integral part time difference Di is measured by the synchronous timer unit 32, and the decimal part time difference Dd is measured by the asynchronous timer unit 34 after the time measurement. For this reason, the time information pulse 18 that is asynchronous with the internal clock 16 and highly accurate can be output regardless of the phase relationship of the internal clock 16 with respect to the detected time information t0. .

  In practice, the time information pulse 18 output from the time information pulse generator 6A includes a propagation delay (spatial propagation delay) and reception from the time information transmitter station 4 to the input of the reception processing unit 8 of the time information pulse generator 6A. There is a propagation delay (circuit propagation delay) from the input of the processing unit 8 to the output of the pulse generation unit 12.

  In the case where these propagation delay times are measured in advance, when the propagation delay time is Toffset, the time measuring time division unit 30 replaces the above-described equations (2) and (3) with the following equations (4), What is necessary is just to convert into (5) Formula and to output to the synchronous type time measuring part 32 and the asynchronous type time measuring part 34, respectively.

Integer time difference Di '
= INT {(tset-t0-Toffset) / Tclk} (4)
Decimal part time difference Dd '
= (Tset−t0−Toffset) − (Tclk × Di ′) (5)

  Next, the time information pulse generator 6B of the second embodiment will be described with reference to FIG.

  The time information pulse generator 6B of FIG. 5 example is different from the time information pulse generator 6A of FIG. 2 example in that an information storage unit 60 that is a memory (storage device) is provided. The difference is that the stored information can be referred to by the electrical information calculation unit 46B, and the analog signal 54A generated by the analog signal generation unit 42A is different.

  In the example of FIG. 5, the analog signal 54 generated by the analog signal generator 42A is a non-linear analog signal 54A as shown in FIG. 3D, and the error increases when approximated as a linear time function. This is a countermeasure. In this case, a time / voltage comparison table for the waveform of the analog signal 54A is stored in the information storage unit 60 in advance.

  At this time, the electrical information calculation unit 46 obtains the set voltage V (Dd) corresponding to the fractional part time difference Dd output from the time measuring time division unit 30 from the time-voltage comparison table and outputs it to the electrical information setting unit 48. do it. If the set voltage V (Dd) corresponding to the decimal part time difference Dd is not stored in the time / voltage comparison table, it can be obtained by interpolation.

  Next, a time information pulse generator 6C of the third embodiment will be described with reference to FIG.

  The time information pulse generator 6C in the example of FIG. 6 is different from the time information pulse generators 6A and 6B in the examples of FIGS. 2 and 5 in the time information detector 10 and the pulse generator 12A (or 12B). Is different in that a pulse comparison unit 62 and a pulse correction unit 64 are inserted. In the time information pulse generator 6C of the third embodiment, the time delay (output accuracy) of the time information pulse 18 is further improved by automatically compensating for the propagation delay of the pulse generators 12A and 12B. ing.

  Therefore, in this time information pulse generator 6C, a pulse comparison is made between the time information t0 detected by the time information detector 10 and the time difference (phase difference or error) ΔTerr between the time information pulses 18 generated by the pulse generators 12A and 12B. This is detected by the unit 62. The pulse correction unit 64 corrects the time difference ΔTerr detected by the pulse comparison unit 62 to the time information t0 of the time information detection unit 10 and sets it in the pulse generation units 12A and 12B.

  In this case, based on the time information t0 detected by the time information detection unit 10 and the time difference ΔTerr detected by the pulse comparison unit 62, the pulse correction unit 64 performs the above (2) to (5) with respect to the pulse generation units 12A and 12B. When setting the tset in the expression (), it is only necessary to set the tset on the left side of ← in the following expression (6).

              tset ← tset−ΔTerr (6)

  Here, as the pulse comparison unit 62, for example, a timing measuring device described in Japanese Patent Application No. 2002-234628 or Japanese Patent Application No. 2003-340596 related to the applicant's application can be used.

  FIG. 7 shows a configuration example of the pulse comparison unit 62 using this timing measurement device, and FIG. 8 shows a waveform diagram used for explaining the operation of the pulse comparison unit 62.

  The pulse comparison unit 62 is input from the reception unit clock generator 14, the sampling signal generator 85 that generates the sampling signal S every time tn (n is an integer) synchronized with the internal clock 16, and the pulse generation units 12A and 12B. A function signal generator 84 for generating a function signal fm that is a function of time synchronized with a rising point (change time) ts (corresponding to the time t3 in FIG. 3) of the time information pulse 18 to be generated, and a function signal fm Is sampled with the sampling signal S to obtain a sampling value Vn (n is an integer), and an arithmetic processor 86 for obtaining a change time ts based on the sampling value Vn and the sampling time tn. The arithmetic processor 86 is also supplied with the time information pulse 18 which is a signal under measurement, and the rising point thereof is detected.

Here, the function signal fm having the time t as a variable, for example, when expressed as a function fm (t), fm (ta) <fm (tb) (monotonically increasing function) at any variable ta and tb satisfying ta <tb. ) Or fm (ta)> fm (tb) (monotonic decreasing function). Monotonically as a function, t ^2, t ³ to a linear function (linear ramp), or a variable and t, logt, e ^t (e is the base of natural logarithm), and the like.

  Here, as an example, the function signal generator 84 generates a voltage signal of a linear function (linear ramp) in which a change in voltage as a function changes linearly with respect to a change in time as a variable. As is well known, the voltage signal of the linear function can be easily generated by an integrator.

  When the time information pulse 18 (see FIG. 8A) is input from the pulse generators 12A and 12B to the function signal generator 84, the function signal generator 84 uses the rising point of the time information pulse 18 as a trigger. The circuit is immediately activated to start charging, and after a predetermined time has elapsed, the circuit is reset and discharged.

  In this example, as shown in FIG. 8C, the function signal generator 84 starts charging at the change time ts of the time information pulse 18, gradually increases the voltage, and starts discharging at time t14. The function signal fm, which is a linear ramp signal that terminates the discharge before time t15, is generated and supplied to the sampler 81.

  On the other hand, the sampling signal generator 85 generates a sampling signal S synchronized with the internal clock 16 and supplies it to the sampling unit 81 as shown in FIG. Since the internal clock 16 and the sampling signal S are completely synchronized, the sampling signal generator 85 is omitted in the circuit design, and the internal clock 16 output from the receiver clock generator 14 is used as the sampling signal S. It is also possible to supply the sampling device 81 directly.

  Here, the internal clock 16 and the sampling signal S are asynchronous with the time information pulse 18.

  The sampling unit 81 samples the function signal fm at each sampling time (measurement time) tn and at each sampling time t10-1, t10, t11, t12, t13, t14, t15, and t16 in FIG. 8C. At each sampling time tn, each measurement voltage Vn, here, measurement voltages V-1, V0, V1, V2, V3, V4, V5, V6 are obtained, and the arithmetic processor 86 receives the measurement time tn (tn = t10− 1, t10, t11, t12, t13, t14, t15, t16) and the measurement voltage Vn (Vn = V0-1, V0, V1, V2, V3, V4, V5, V6) are supplied as a set.

  The arithmetic processor 86 detects the rising point of the signal M to be measured, and the measured voltages V-1, V0, V1 during the supplied sampling times t10-1, t10, t11, t12, t13, t14, t15, t16. , V2, V3, V4, V5, and V6, the sampling times t11, t12, t13, and t14 are recognized as function signal generation intervals of the linear ramp.

  Further, the arithmetic processor 86 obtains a voltage in a section where no function is generated in the vicinity of the rising point of the time information pulse 18 as an offset error value voltage Voff. In this case, the measured voltages V-1, V0, V5 at sampling times t10-1, t10, t15, t16 before the start of function signal generation (before the start of integration) in which the function signal generator 84 is sufficiently discharged. For example, the value of V6 is averaged to obtain the offset error value voltage Voff.

  Next, the arithmetic processor 86 generates a function signal from the sampling times t11, t12, t13, t14 obtained in this way, the corresponding measured voltages V1, V2, V3, V4 and the offset error value voltage Voff. A straight line (approximate straight line) L (see (d) of FIG. 8) that approximates the voltage change of the straight ramp in the section (ts to t14) is obtained, and the intersection of the approximate straight line L and the offset error value voltage Voff is obtained before time t11. By extrapolating retroactively, the change time ts of the time information pulse 18 can be obtained. Thus, even when the change time ts, which is the rising point of the time information pulse 18, and the sampling time tn are asynchronous, the change time ts of the time information pulse 18 can be obtained from the approximate straight line L.

  If this extrapolation is described using mathematical expressions, the sampling time t11, t13 and the measured voltages V1, V3 during the function signal generation period are used, and the variable range of the time t is simply assumed to be ts ≦ t ≦ t14. For example, the approximate straight line L (t) can be expressed by the following equation (7).

L (t) = [(t-t11) / {(t13-t11) / (V3-V1)}]
+ V1 (7)

  By substituting t = ts and L (ts) = Voff into the equation (7), the measurement time ts can be obtained by the following equation (8).

  ts = t11− (V1−Voff) / {(V3−V1) / (t13−t11)} (8)

  The measurement time ts obtained by the arithmetic processor 86 in this way is supplied to the pulse correction unit 64. The pulse correction unit 64 determines the time difference ts−t0 = time between the measurement time ts and the time information t0 (actually, the time information t0 that arrives next to the first set time information t0, for example, one second later). ΔTerr is obtained and substituted for ΔTerr on the right side of ← in the above equation (6).

  According to the time information pulse generating device 6C according to the third embodiment of FIG. 6, not only the circuit delay offset but also the temperature change and the individual difference of the device can be corrected. It is possible to improve.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is applicable to any of the time information pulse generators 6A, 6B, 6C of the first to third embodiments.

  An object of the present invention is to improve the output accuracy of the time information pulse 18 without increasing the frequency of the internal clock 16, but the present invention is effective even when the frequency of the internal clock 16 is reduced.

  The solid line arrow in FIG. 9A indicates the internal clock 16a in which the frequency of the internal clock 16 is halved. In this case, as shown in FIG. 9B, the count end signal 52 output from the count end signal output unit 40 is output in synchronization with the rising edge of the internal clock 16a.

  Therefore, the analog signal 54 generated by the analog signal generation unit 42 has a waveform shown in FIG.

  The coincidence signal 56 of the comparator 44 has a waveform shown in FIG.

  The pulse after waveform shaping output from the pulse shaping unit 50, that is, the time information pulse 18 has a waveform shown in FIG.

  In the example of FIG. 9, an example in which the frequency of the internal clock 16 is lowered to ½ is shown. The frequency division value can be set to a desired value according to the output accuracy.

  Further, the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the contents described in this specification.

It is a block diagram of the time information pulse generator of the 1st example. FIG. 2 is a block diagram of a pulse generator in the time information pulse generator of the example of FIG. 1. It is operation | movement explanatory drawing of the time information pulse generator of 1st Example. It is timing explanatory drawing of the time information pulse of 1st, 2nd Example. It is a block diagram of the pulse generation part which concerns on 2nd Example. It is a block diagram of the time information pulse generator of 3rd Example. FIG. 7 is a block diagram of a pulse comparison unit in the time information pulse generator of FIG. 6 example. It is an operation explanatory view of a pulse comparison part. It is operation | movement explanatory drawing when the frequency of an internal clock is halved. It is a block diagram of the time information pulse generator of a prior art. It is explanatory drawing of the error of the time information pulse in the time information pulse generator of a prior art.

Explanation of symbols

2A ... Time information pulse generation systems 6A, 6B, 6C ... Time information pulse generator 10 ... Time information detection unit 12, 12A, 12B ... Pulse generation unit 14 ... Reception unit clock generator 16, 16a ... Internal clocks 18, 18a, 18b ... Time information pulse 18i ... Ideal time information pulse 20 ... Transmitting station clock generator 22 ... Transmitting station clock 30 ... Timekeeping time division unit 32 ... Synchronous timing unit 34 ... Asynchronous timing unit 38 ... Counter unit 40 ... End of counting Signal output unit 42 ... Analog signal generation unit 44 ... Comparator 46, 46B ... Electric information calculation unit 48 ... Electric information setting unit 50 ... Pulse shaping unit 52 ... Count end signal 54, 54A ... Analog signal 56 ... Match signal 60 ... Information Storage unit 62 ... Pulse comparison unit 64 ... Pulse correction unit 81 ... Sampling device 84 ... Function signal generator 85 ... Samp Ring signal generator 86 ... arithmetic processor

Claims (2)

A reception processing unit for receiving time information transmitted from the transmitting station;
A time information detection unit for detecting the time information from the demodulated information obtained by the reception processing unit;
At a time set based on the time information, a pulse generation unit that outputs a time information pulse,
The pulse generator is
A time difference between the time information and the set time is divided into an integer part time difference represented by an integral multiple of an internal clock period and a fractional part time difference represented by a decimal value less than the internal clock period. A timekeeping time division unit;
A synchronous clock unit that clocks the integer part time difference with the resolution of the internal clock period ;
Possess the asynchronous timer unit for measuring the fractional part time difference with a resolution of less than the internal clock period,
The synchronous timer unit is
A synchronous time setting unit for outputting the integer part time difference as a set value;
A counter unit that counts the set value set by the synchronous time setting unit in synchronization with the internal clock;
A count end signal output unit for outputting a count end signal in the counter unit;
Have
The asynchronous timer unit is
Using the count end signal output from the count end signal output unit as a trigger signal, an analog signal generation unit that outputs an analog signal whose amount of electricity changes with time, and
An electrical information calculation unit for converting the decimal part time difference into electrical information;
An electrical information setting unit that outputs the electrical information obtained by the electrical information calculation unit as a reference value;
A comparator that compares the analog signal output from the analog signal generator with the reference value set from the electrical information setting unit, and outputs a match signal when the analog signal matches the reference value; ,
A pulse shaping unit that shapes the waveform of the coincidence signal output from the comparator and outputs the time information pulse;
Time information pulse generator, characterized by have a. In the time information pulse generator according to claim 1,
The asynchronous timekeeping unit further includes an analog signal waveform storage unit that prestores a waveform of an analog signal whose amount of electricity changes with time.
The electrical information calculation unit converts the decimal part time difference into the electrical information by referring to the analog signal waveform stored in the analog signal waveform storage unit. Generator.

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