JP2007214896A - Method and device for generating power supply synchronization carrier wave - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply synchronization carrier wave generating device which is small in frequency deviation by synchronizing a frequency with a pilot signal by multiplication processing and PLL processing between the pilot signal and a reference signal and multiplying the frequency in a transmitter-receiver for using power supply synchronization carrier wave processing to perform communication. <P>SOLUTION: The synchronization carrier wave generating device comprising: a PLL circuit composed of a complex multiplier 1, a loop filter 2 and a reference signal generator (oscillator) 6; a condition determining part 4; and a frequency multiplier 5 is used to generate a power supply synchronization carrier wave having a small frequency deviation by calculating a frequency Fd by multiplying the pilot signal P by the reference signal sin, synchronizing a fundamental frequency Fd1 with the pilot signal P by the PLL and multiplying the fundamental frequency Fd1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for generating a power synchronized carrier in a transmitter / receiver that performs communication using power synchronized carrier processing, and is particularly suitable for generating a power synchronized carrier having a small frequency deviation by multiplying a pilot signal. The present invention relates to a method and an apparatus for generating a power synchronized carrier wave.

  An outline of a conventional power-synchronized carrier wave generation device will be described with reference to FIGS. FIG. 5 is a block diagram of a conventional power synchronized carrier wave generator, and FIG. 6 is a time chart of the power synchronized carrier wave generator. The conventional power synchronized carrier wave generation device includes a filter 8, a waveform shaping circuit 9, an edge detection circuit 10, a counter 11, and a frequency multiplier 12. The pilot signal detected from the feeder (50, 60 Hz) is filtered out by the filter 8 and output to the waveform shaping circuit 9. The waveform shaping circuit 9 converts a sinusoidal pilot signal into a square wave signal. The edge detection circuit 10 detects the edge by differentiating the square wave signal and obtains the period of the pilot signal. The frequency multiplying circuit 12 generates a multiplied carrier wave by multiplying the period of the pilot signal.

  FIG. 6 is a time chart of the power supply synchronous carrier wave generator. The input pilot signal 13 determines the positive / negative level by detecting the zero-cross point in the waveform shaping circuit 9, and creates a square wave signal 14. The edge detection circuit 10 differentiates the rising edge of the square wave signal 14 to create an edge detection signal 15 from which an edge is extracted. The counter 11 measures the basic period Tp of the edge detection signal 15 using the clock signal, and the frequency multiplier 12 multiplies this period to generate the multiplied carrier wave 16.

  This prior art has a problem that the frequency deviation becomes large when a carrier wave having a high degree is generated.

  In the above prior art, since the fundamental frequency of the carrier wave is extracted from the square wave shaped pilot signal and this frequency is multiplied, there is a problem that the frequency deviation becomes large when a carrier wave having a high order is generated.

  An object of the present invention is to measure a frequency and a level by a multiplication process of a pilot signal and a reference signal in a transceiver that performs communication using power supply synchronous carrier wave processing. This frequency is synchronized with the pilot signal by a PLL (Phase Lock Loop). It is another object of the present invention to provide a power synchronized carrier generation device capable of generating a power synchronized carrier with a small frequency deviation by determining whether or not the measured frequency and level satisfy a predetermined condition and multiplying the measured frequency. .

  In order to achieve the above object, the present invention uses the following means. The frequency and level are measured by complex multiplication of a square wave shaped pilot signal and a reference signal generator. The measured frequency is synchronized with the pilot signal by a PLL. A determination unit determines whether or not the measured frequency and level are predetermined conditions, and in the case of the predetermined condition, a method of multiplying the measured fundamental frequency is used.

  By such means, it is possible to provide a multiplied carrier generation device having a small frequency deviation in a transmitter / receiver that performs communication using power supply synchronous carrier processing.

(Function)
According to the set frequency setting value, the signal frequency of the cos and sin components is generated from the reference signal generator. The reference signal and the pilot signal are multiplied, and the frequency and level are measured. This frequency is synchronized with the pilot signal by a PLL. If the measured frequency and level are predetermined conditions, the measured fundamental frequency is multiplied to generate a carrier wave.

  Specifically, the present invention relates to a power supply synchronous carrier generation method for generating a multiplied carrier wave of a pilot signal by multiplying a pilot signal, generating a reference signal by adding a reference frequency to the pilot signal, and using the reference signal The frequency of the reference signal is synchronized with the pilot signal, and the pilot signal is higher or lower than the reference frequency by using a deviation value between the reference signal and the reference signal of the synchronized frequency and a multiplication value of the reference signal and the pilot signal. The frequency of the pilot signal is determined based on the determination result, and the determined frequency is multiplied to generate a power supply synchronous carrier wave.

  With such a technique, it is possible to provide a multiplied carrier generation device with a small frequency deviation in a transmitter / receiver that performs communication using power supply synchronous carrier processing.

  As described above, the present invention has the following effects. According to the power synchronized carrier wave generation apparatus of the present invention, the pilot signal and the reference signal are multiplied to obtain the frequency deviation and level, and the obtained frequency is synchronized with the pilot signal by the PLL. Next, it is possible to provide a power synchronized carrier generation device with a small frequency deviation by adopting a method of determining whether the obtained frequency and level satisfy predetermined conditions and multiplying the measured frequency to generate a synchronized carrier. It becomes.

  Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of a power synchronized carrier generation apparatus according to a first embodiment of the present invention. The power supply synchronous carrier wave generator includes a complex multiplier 1, a loop filter 2, low pass filters (LPF) 3 a and 3 b, a determination unit 4, a frequency multiplier 5, an oscillator 6 and an adder 7. .

  The square wave pilot signal P is input to the complex multiplier 1 and is multiplied by the reference signal (cos signal and sin signal) generated by the oscillator 6 and the complex multiplier 1. As a result of multiplication of the square wave pilot signal P and the sin signal, the obtained frequency deviation Fd is averaged by the loop filter 2 to be a frequency deviation Fd1. This frequency deviation Fd1 is added to the reference frequency 55 Hz by the adder 7 to calculate the next frequency set value F and set it in the oscillator 6. The oscillator 6 generates reference signals sin and cos according to the frequency F set by the above calculation. Such calculation processing is repeated to synchronize the transmission frequency of the oscillator 6 with the pilot signal P.

  The complex multiplier 1, the loop filter 2, the adder 7, and the oscillator 6 constitute a PLL circuit as phase synchronization means for synchronizing the pilot signal P and the oscillation frequency of the oscillator 6.

  Further, the level Lv1 obtained as a result of multiplication of the square wave pilot signal P and the cos signal is smoothed by the LPF 3a (low-pass filter) and output to the determination unit 4 as the level Lv2. On the other hand, the frequency deviation Fd1 obtained as a result of multiplication of the square wave pilot signal P and the sin signal is also smoothed by the LPF 3b and output to the determination unit 4 as the frequency deviation Fd2. The determination unit 4 determines the conditions of the level Lv2 and the frequency deviation Fd2, determines whether or not a predetermined condition is satisfied, and outputs the result to the frequency multiplier 5. When the predetermined condition is satisfied, the frequency multiplier 5 multiplies the measured frequency by a predetermined order to generate a multiplied carrier wave.

  A multiplied carrier output process in the power synchronized carrier generation apparatus according to the first embodiment of the present invention will be described with reference to the flowchart of FIG. First, the adder 7 adds the reference frequency (55 Hz) and the initial value of the output Fd1 of the loop filter 6 to calculate the frequency setting value F (step S1). The oscillator 6 generates reference signals (cos signal and sin signal) with the set frequency setting value F. (Step S2). The complex multiplier 1 multiplies the pilot signal P and the sin signal to calculate the frequency deviation Fd (step S3). The frequency deviation Fd is averaged by the loop filter 2 to calculate the frequency deviation Fd1 (step S4). The oscillation frequency of the oscillator 6 is synchronized with the pilot signal P by repeating the operations in steps S1 to S4.

  On the other hand, simultaneously with the processing of step S3, the complex multiplier 1 multiplies the pilot signal P and the cos signal of the oscillator 6 to calculate the level Lv1 (step S6).

  In step S4, the measured frequency deviation Fd1 is smoothed by the LPF 3b and output as the frequency deviation Fd2 (step S5). Further, the level Lv1 measured in step S6 is smoothed by the LPF 3a and output as the level Lv2 (step S7).

  The determination unit 4 determines whether the frequency of the pilot signal P is 50 Hz from the numerical value of the frequency deviation Fd2 smoothed in step S5. If the output (Fd2) is +5 Hz, the determination unit 4 determines 60 Hz and outputs ( If Fd2) is −5 Hz, it is determined to be 50 Hz (step S8).

  When the determination result is 50 Hz, the determination unit 4 determines whether the frequency synchronization (lock-in) condition is satisfied from the numerical values of the frequency deviation Fd2 and the level Lv2 (step S9). If the frequency synchronization condition is satisfied, the frequency multiplier 5 outputs a 50 Hz multiplied carrier wave (step S10). On the other hand, the determination unit 4 similarly determines the frequency synchronization (lock-in) condition from the numerical values of the frequency deviation Fd2 and the level Lv2 when the determination result of step S8 is 60 Hz (step S11). If the frequency synchronization condition is satisfied, the frequency multiplier 5 outputs a 60 Hz multiplied carrier wave (step S12).

  In this way, it is possible to synchronize the oscillation frequency of the oscillator 6 with the pilot signal P and generate a multiplied carrier wave of 50 Hz or 60 Hz.

  3 and 4 are time charts of the first embodiment. FIG. 3 shows an example of a multiplier output when a 50 Hz pilot signal is input. A level Lv1 (FIG. 3B) having a ripple having a frequency component twice that of the input signal is output by multiplying the square wave shaped pilot signal P (FIG. 3A) and the cos signal. On the other hand, a frequency deviation Fd1 (FIG. 3C) having a ripple having a frequency component twice that of the input signal is output by multiplication of the square wave shaped pilot signal P and the sin signal.

  FIG. 4 is a diagram showing an output obtained by smoothing the multiplier output with LPF. The level Lv1 and frequency deviation Fd1 obtained by the above calculation are smoothed by LPF, and the level Lv2 and frequency deviation Fd2 are output. In a steady state, in the case of a 50 Hz pilot signal input, the level Lv2 is −0.5 and the frequency deviation Fd2 is −5.

Next, a second embodiment of the present invention in which the power synchronized carrier wave generator according to the present invention is applied to an on-vehicle ATC receiver will be described with reference to FIG. FIG. 7 shows an example in which the power synchronized carrier wave generator of the present invention is applied as an on-board ATC receiver of a train. The train 50 is equipped with an ATC on-board device 30 that automatically controls the speed. This apparatus receives the ATC signal transmitted to the rail 60 and controls the speed of the train. An ATC signal modulated with a power supply synchronous carrier wave is transmitted to the rail 60.
The train 50 includes an ATC on-board device 30 and a power receiver 40. The ATC on-board device 30 includes a synchronous carrier generation unit 31 comprising the power supply synchronous carrier generation device described in the first embodiment, a filter 32, a detection unit 33, a demodulation unit 34, and an ATC control unit 35. is doing.

  The power receiver 40 receives the ATC signal modulated by the power synchronized carrier of the rail 60, removes the noise component by the filter 32, and outputs it to the detector 33. On the other hand, the synchronized carrier generation unit 31 generates a multiplied carrier synchronized with the power supply from the pilot signal, and outputs it to the detection unit 33. The detector 33 extracts an ATC signal in a predetermined carrier band using the multiplied carrier wave. The demodulator 34 demodulates data from the extracted ATC signal. The ATC control unit 35 compares the train speed with a speed limit signal obtained from the demodulated data, and outputs a brake output. Further, the train speed and other information are displayed on an ATC information display unit (not shown).

  Next, a third embodiment in which the power synchronized carrier wave generator according to the present invention is applied to a terrestrial ATC transmitter / receiver will be described with reference to FIG. FIG. 8 shows an example in which the power synchronized carrier wave generator according to the present invention is applied as a terrestrial ATC transceiver for a train. The terrestrial ATC receiver includes a matching transformer 61, a transmission unit 62, a modulation unit 63, a reception unit 64, a terrestrial signal control unit 65, and a synchronous carrier wave composed of the power supply synchronous carrier wave generator shown in the first embodiment. A generation unit 66 is included.

  A signal corresponding to the speed limit for the train 50 is output from the ground signal control unit 65 to the modulation unit 63. The modulation unit 63 outputs a signal modulated according to the multiplied carrier wave of the synchronous carrier wave generation unit 66 to the transmission unit 62. The transmission unit 62 amplifies the modulation signal and transmits the speed limit signal of the train 50 to the rail 60 via the matching transformer 61.

  On the other hand, a signal indicating whether the train 50 is present (a train presence line detection signal) and a monitor signal of the transmission signal are input to the receiving unit 64 via the matching transformer 61. The receiving unit 64 demodulates the received ATC signal according to the multiplied carrier wave of the synchronous carrier wave generating unit 66, and outputs a standing line detection signal and a transmission monitor signal. The ground signal control unit 65 controls the level of the transmission signal from the monitor signal. In addition, the train line detection information is displayed on the track line information display unit (not shown) from the train line detection signal.

The block diagram explaining the structure of the power-synchronization carrier wave generator concerning 1st Example of this invention. The flowchart explaining the process in the power supply synchronous carrier wave generator concerning 1st Example of this invention. 4 is a time chart of a pilot signal P, a multiplier output Lv1, and a frequency deviation Fd1 of the power synchronized carrier generation apparatus according to the first embodiment of the present invention. The time chart of the LPF output of the power-supply-synchronized carrier wave generator according to the first embodiment of the present invention. The block diagram explaining the structure of the power supply synchronous carrier wave generation apparatus of a prior art. The time chart in the power supply synchronous carrier wave generator of a prior art. The block diagram explaining the structure of 2nd Example which applied the power-synchronization carrier wave generation apparatus concerning this invention to the ATC on-board apparatus. The block diagram explaining the structure of 3rd Example which applied the power-synchronization carrier wave generation apparatus concerning this invention to the terrestrial ATC receiver.

Explanation of symbols

1: complex multiplier, 2: loop filter, 3a, 3b: LPF, 4: determination unit, 5: frequency multiplier, 6: oscillator, 7: adder, 8: filter, 9: waveform shaping circuit, 10: edge Detection circuit, 11: counter, 12: frequency multiplier, 30: ATC on-board device, 31: synchronous carrier wave generation unit, 32: filter, 33: detection unit, 34: demodulation unit, 35: ATC control unit, 40: reception Electric: 50: Train, 60: Rail, 61: Matching unit, 62: Transmitter, 63: Modulator, 64: Receiver, 65: Ground signal generator, 66: Synchronous carrier generator

Claims (4)

In a power supply synchronous carrier wave generating device configured by means for detecting a pilot signal and frequency multiplying means for multiplying the frequency of the detected pilot signal,
Means for generating a reference signal;
Means for multiplying the reference signal and the pilot signal;
Means for calculating the frequency deviation from the multiplication output;
Means for calculating the level from the multiplication output;
Phase synchronization means for synchronizing the frequency,
The frequency multiplier means generates a multiplied carrier by multiplying the frequency measured when the numerical values of the frequency and level obtained by multiplying the pilot signal and the reference signal satisfy a predetermined condition, and generating a power synchronized carrier wave apparatus.   A train on-board ATC receiver comprising the power-synchronized carrier wave generating device according to claim 1, means for receiving an ATC signal, and control means for comparing the received signal with a train speed signal to control the train speed.   An on-vehicle ATC transmission / reception apparatus for a train comprising the power synchronized carrier generation apparatus according to claim 1, means for transmitting an ATC signal, means for receiving a train presence detection signal, and control means for controlling the transmission level of the ATC signal. . In a power synchronized carrier generation method for multiplying a pilot signal and generating a multiplied carrier wave of the pilot signal,
The reference signal is generated by adding the reference frequency to the pilot signal,
Using this reference signal, synchronize the frequency of the reference signal with the pilot signal,
Determine whether the pilot signal is higher or lower than the reference frequency by using a deviation value between the reference signal and the reference signal of the synchronized frequency and a multiplication value of the reference signal and the pilot signal,
Determine the frequency of the pilot signal based on the result,
A power synchronized carrier generation method, characterized in that a power synchronized carrier is generated by multiplying a determined frequency.

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