JP2002094467A - Signal analysis system, signal recording device and signal analyzer used in the system, and storage medium stored having phase error correction control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct phase errors between channels which are generated in receiving signal. SOLUTION: In a signal recording device 100, when measuring errors, a reference signal generated by a reference signal generating section 120 is recorded in a magnetic tape, after being added with an identifier for identifying the signal recorder 100 by a recording processing section 140. In a signal analyzer 200, when measuring an error, the reference signal for n channels regenerated from the magnetic tape 10 is compared for phases across channels by a phase correction section 230, for correcting a phase error across channels to determine a phase correction coefficient, corresponding to a phase error across channels. The phase correction coefficient is stored in a phase correction table to be associated with the identifier. In a normal operation, the signal analyzer 200 extracts an identifier from a received signal and reads a phase correction coefficient, corresponding to the identifier from the phase correction table, and then causes the phase of the received signal to be displaced, based on the phase correction coefficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal analysis system for analyzing radio waves of a plurality of channels, a signal recording device and a signal analysis device used in the system, and a storage medium storing a phase error correction control program.

[0002]

2. Description of the Related Art Conventionally, in a radio wave monitoring system, a signal analysis system for receiving various radio waves transmitted in space and analyzing the received signals has been proposed. In this type of system, in order to identify various radio waves, a signal recording device receives radio waves with an antenna,
The received signal is recorded on a magnetic tape, and the signal analysis device reproduces the received signal from the magnetic tape to perform identification. In this type of system, a signal recording device is mounted on a ship or the like to receive radio waves of multiple channels and record them on a magnetic tape, and a center station reproduces the received signals of the multiple channels from the magnetic tape and analyzes the signals. I do it.

[0003] In the above-mentioned signal analysis system, as shown in FIG. 4, a phase error is caused in a received signal of a plurality of channels. In this case, this is dealt with by applying a PLL to the reference signal recorded on the magnetic tape, but this alone does not improve the phase error during recording / reproduction. Two possible causes of this phase error are a phase error due to head mount tolerance and a phase error due to static skew.

(1) Phase error due to head mounting tolerance The signal recording apparatus and the signal analyzing apparatus have a total of four heads, each of which has an odd channel for recording and an even channel and an odd channel for reproduction and an even channel. It is made up of channels. In addition, each head is
Since it is mechanically fixed with screws or the like, as shown in FIG. 5, errors in the distance between the heads (space between the stacks) between the odd-numbered channels and the even-numbered channels, that is, the head mounting tolerance cannot be ignored. (2) Regarding phase error due to static skew Skew is an artifact error of a time transition between two signals, that is, a phase error, and static skew is a phase between outer channels on a head. Indicates a shift. Therefore, even signals recorded / reproduced by the same odd-numbered (or even-numbered) head have a phase shift between channels as shown in FIG.

As described in (1) and (2) above, if a phase error occurs between channels during recording / reproducing, radio waves cannot be identified and erroneous results are likely to be obtained. In order to solve this, a skilled operator needs to perform an analysis by hand, such as displaying and examining the results and giving a final result, thereby lowering the analysis efficiency. Further, digital recording may be considered, but a high-speed A / D (analog / digital) converter or the like is required, which leads to an increase in cost.

[0006]

As described above, the conventional signal analysis technique has no effective means for correcting a phase error between channels given to a plurality of received signals during recording and reproduction. Was. For this reason, in order to analyze the received signals of a plurality of channels, manual analysis and a high-speed A / D converter are required, and there has been a situation in which a reduction in analysis efficiency and an increase in the cost of the entire system cannot be avoided. .

An object of the present invention is to provide a signal analysis system capable of correcting a phase error between channels occurring in a received signal of each channel to improve analysis accuracy, prevent erroneous analysis, and improve analysis work, and this system. It is an object of the present invention to provide a signal recording device and a signal analyzing device used in the above, and a storage medium storing a phase error correction control program.

[0008]

A signal analysis system according to the present invention receives radio waves of a plurality of channels and converts the received signals of the plurality of channels to a magnetic tape running between a pair of reels using a rotary head. A plurality of signal recording devices for recording, and a signal analysis device for reproducing and analyzing received signals of a plurality of channels from a magnetic tape by using a rotary head, and performing an analysis process. A reference signal acquiring means for acquiring a reference signal common to the received signal of the channel, and an identifier for identifying the apparatus for each channel for the received signal of a plurality of channels at the time of recording on a magnetic tape, and measuring an error. Sometimes, the reference signal obtained by the reference signal obtaining means in place of the received signals of the plurality of channels is recorded in the recording area of each of the plurality of channels in the magnetic tape. Recording means for assigning and recording an identifier for identifying the apparatus, and the signal analysis apparatus performs a phase comparison between each channel with respect to a reference signal for a plurality of channels reproduced from a magnetic tape at the time of error measurement. A phase correction coefficient calculating means for calculating a phase correction coefficient corresponding to the phase error; a storage means for storing the phase correction coefficient calculated by the phase correction coefficient calculating means in association with an identifier; By extracting an identifier added to the received signal, reading a phase correction coefficient corresponding to the extracted identifier from the storage means, and multiplying the received signal by the read phase correction coefficient, the received signal is recorded and reproduced. Phase error correcting means for correcting a phase error between given channels.

That is, according to the present invention, in the signal recording apparatus, when measuring an error, an identifier for identifying which signal recording apparatus is used in the recording area of each of the plurality of channels on the magnetic tape when the received signal of the plurality of channels and the common reference signal are used. In the signal analyzer, when the error is measured, the reference signal for a plurality of channels reproduced from the magnetic tape is subjected to a phase comparison between each channel, so that a phase correction corresponding to the phase error is performed. A coefficient is obtained, and the phase correction coefficient is stored in the storage unit in association with the identifier. Thereafter, at the time of recording / reproduction of the received signals of a plurality of channels, the received signals of the plurality of channels are recorded on a magnetic tape with an identifier for identifying which signal recording device is provided in the plurality of signal recording devices. The identifier is extracted from the received signals of the plurality of channels reproduced from the magnetic tape, the phase correction coefficient corresponding to the identifier is read out from the storage means, and the phase of the received signal of each channel corresponds to the phase correction coefficient. Will be shifted.

Therefore, according to the present invention, at the time of recording / reproduction,
Automatically corrects the phase error between channels that occurs in the received signal of each channel, thereby contributing to improvement of analysis accuracy and prevention of erroneous analysis. As a result, the analysis work can be greatly improved.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an embodiment of a signal analysis system according to the present invention.

The system shown in FIG. 1 roughly includes m signal recording devices 100 and a signal analysis device 200. The m signal recording devices 100 include n reception processing units 1
11 to 11n, a reference signal generating unit 120, an input switching unit 130, and a recording processing unit 140. The radio waves of the plurality of channels are received by the respective antennas of the reception processing units 111 to 11n, and the reception signals of the plurality of channels are output to the recording processing unit 140 by switching the input switching unit 130 to the reception signal side.

The recording processing unit 140 assigns an identifier for identifying which one of the m signal recording devices 100, and applies a rotary type to the magnetic tape 10 running between a pair of reels (not shown). Recording is performed using the head 20.

The signal analyzer 200 includes a reproduction processor 210
, A signal processing unit 220 and an inter-channel phase correction unit 23
0, an analysis processing unit 240, and an identification processing unit 250. The reproduction processing unit 210 uses the rotary head 211 to reproduce the received signals of the plurality of channels from the magnetic tape 10 on which the received signals of the plurality of channels are recorded by the signal recording device 100. The reproduced received signals of a plurality of channels are subjected to signal processing in a signal processing unit 220, a phase error between channels is corrected by an inter-channel phase correction unit 230, and analyzed by an analysis processing unit 240. The radio wave received by the unit 250 is subjected to identification processing. In this identification processing, the type of radio wave and the location of the radio wave are identified.

In this embodiment, in order to correct a phase error between channels given to a received signal,
The signal recording device 100 switches the input switching unit 130 to the reference signal side, and the recording processing unit 140 records the input reference signal in the recording area of each of the n channels in the magnetic tape 10. That is, the same reference signal is recorded in the recording area of each channel in the magnetic tape 10 in a pseudo manner. At the same time, the recording processing unit 140 assigns an identifier for identifying which one of the m signal recording devices 100, and attaches the rotary head 20 to the magnetic tape 10 traveling between a pair of reels (not shown). And record.

On the other hand, in the signal analyzer 200, the inter-channel phase correction unit 230 has a configuration as shown in FIG.

In FIG. 2, an inter-channel phase correction unit 2
30 includes a phase shifter 231, a phase error measuring device 232, an identifier extracting circuit 233, and a memory 234.
Among them, the phase error measuring device 232 performs a phase comparison between the channels with respect to a reference signal for a plurality of channels reproduced from the magnetic tape 10 at the time of error measurement, and obtains a phase correction coefficient corresponding to the phase difference. It is stored in the phase correction table in the memory 234 in association with the identifier. In addition,
As many phase correction tables as the number of signal recording devices 100 (for example, m) are prepared.

On the other hand, during normal operation of the system,
The identifier extracting circuit 233 extracts the identifier reproduced from the magnetic tape 10. The extracted identifier is supplied to the memory 234 as an address of the memory 234, so that the phase correction coefficient relating to the phase between the channels is read from the memory 234. This phase correction coefficient is
It is supplied to the phase shifter 231. The phase shifter 231 shifts the phase of the output signal of the signal processing unit 220 by the amount of the phase correction coefficient read from the memory 234. As a result, the phase error between channels given to the received signal at the time of recording and reproduction is corrected.

In this case, while the phase correction coefficient is read out from the memory 234 and corrected, the phase error
32 does not supply a signal to the memory 234,
The signal is supplied when the phase correction table in 4 is updated.

As described above, in the above-described embodiment, in the signal recording apparatus 100, the reference signal generated from the reference signal generation section 120 is measured by the recording processing section 140 in the magnetic tape 10 when the error is measured. Recorded with an identifier for identifying which signal recording device 100 is provided,
In the signal analyzer 200, when measuring the error, the phase error measuring device 2 of the inter-channel phase corrector 230 compares the n-channel reference signals reproduced from the magnetic tape 10 with each other.
A phase comparison is performed between the channels at 32 to obtain a phase correction coefficient corresponding to the phase error, and the phase correction coefficient is stored in the memory 234 in association with the identifier.

Thereafter, during normal operation of the system, in the signal recording device 100, the n-channel received signal is recorded on the magnetic tape 10 by the recording processing unit 140 with an identifier for identifying the signal recording device 100 added. In the signal analyzer 200, the identifier is extracted from the signal reproduced from the magnetic tape 10 by the identifier extracting circuit 233, the phase correction coefficient corresponding to the identifier is read from the memory 234, and the phase correction coefficient read from By supplying the coefficient to the phase shifter 231, the phase of the received signal is shifted by an amount corresponding to the phase correction coefficient.

Therefore, at the time of recording / reproducing, it is possible to automatically correct the phase error between the channels generated in the received signal of each channel, thereby improving the analysis accuracy and preventing erroneous analysis. On the other hand, the analysis work can be greatly improved because the trouble of confirmation and correction can be reduced.

In the above embodiment, the signal recording device 100 and the signal analyzing device 200 have been described as being separately arranged, but they may be integrated.

The correction contents of the memory 234 may be fixed if the phase error is universal. If the phase error is not universal, but has a regularity according to a certain condition, the setting may be switched by the condition judgment. Further, it is a matter of course that the correction content may be updated from time to time with a test signal or the like.

The present invention is not limited to the configuration of the above embodiment. For example, the configuration of the inter-channel phase correction unit 230 of the signal analysis device 200 may be realized by software. FIG. 3 is a flowchart illustrating a processing operation procedure of the inter-channel phase correction unit 230 when performing the phase correction control.

When a received signal reproduced from the magnetic tape 10 is input (step ST1), the inter-channel phase corrector 230 determines whether the system is in normal operation or error measurement (step ST1). ST2). And
If the error is measured (YES), the inter-channel phase correction unit 230 compares the phases of the n-channel reference signals reproduced from the magnetic tape 10 between the channels, and corresponds to the phase difference. A phase correction coefficient is obtained (step ST3), and the obtained phase correction coefficient is registered in a previously prepared phase correction table in association with the identifier (step ST4).

If it is determined in step ST2 that the system is operating normally (NO), the inter-channel phase corrector 2
30 extracts an identifier from the received signal (step ST
5) The phase correction coefficient corresponding to the identifier is read from the phase correction table, and the phase of the corresponding received signal is shifted by the amount of the phase correction coefficient (step ST6).

Subsequently, the inter-channel phase correcting section 230
Determines whether or not the phase correction control processing has been completed for the received signals of all channels (step ST7).
Add 1 to own channel until completion (step ST
8) Steps ST5 to ST7 are repeatedly executed.

The inter-channel phase correction section 230
Ends the phase correction control processing for the received signals of all channels (YES), and ends the processing.

As described above, the inter-channel phase correction unit 23
A value of 0 can correct a phase error between channels with respect to an n-channel received signal by software, so that a general-purpose hard disk can be used, and therefore, the cost of the signal analyzer 200 can be reduced.

[0032]

As described in detail above, according to the present invention,
A signal analysis system capable of correcting a phase error between channels generated in a received signal of each channel to improve analysis accuracy, prevent erroneous analysis, and improve analysis work, and a signal recording device and a signal used in the system. An analysis device and a storage medium storing a phase error correction control program can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a signal analysis system according to the present invention.

FIG. 2 is an exemplary block diagram illustrating a configuration of an inter-channel phase correction unit according to the embodiment;

FIG. 3 is a flowchart illustrating an operation of an inter-channel phase correction unit according to another embodiment of the present invention.

FIG. 4 is a timing chart showing a state of a received signal in which a conventional phase error has occurred.

FIG. 5 is a diagram for explaining a phase error due to a head mount tolerance.

FIG. 6 is a view for explaining a phase error due to static skew.

[Explanation of symbols]

 Reference Signs List 10: magnetic tape, 20: rotary head, 100: signal recording device, 111 to 11n: reception processing unit, 120: reference signal generation unit, 130: input switching unit, 140: recording processing unit, 200: signal analysis device, 210: reproduction processing unit, 220: signal processing unit, 230: phase correction unit between channels, 231: phase shifter, 232: phase error measuring device, 233: identifier extraction circuit, 234: memory, 240: analysis processing unit, 250 ... Identification processing unit.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Ryoichi Edamura 1 Kodamu Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa F-term in the Komukai Plant of Toshiba Corporation 5K042 AA06 CA02 CA23 EA15 FA11 JA05 5K047 AA08 BB04 CC12 GG44 HH12 HH55 MM24 MM59 MM63

Claims (4)

[Claims] A plurality of signal recording devices for receiving radio waves of a plurality of channels and recording the received signals of the plurality of channels on a magnetic tape running between a pair of reels using a rotary head; A signal analyzer that reproduces and analyzes received signals of a plurality of channels using a rotary head, wherein the plurality of signal recording devices are configured to generate a reference signal common to the received signals of the plurality of channels when measuring an error. A reference signal acquiring means for acquiring, when recording on a magnetic tape, assigning an identifier for identifying the own device to each of the plurality of channels of received signals, and replacing the received signals of the plurality of channels at the time of error measurement. The reference signal obtained by the reference signal obtaining means is stored in a recording area of each of a plurality of channels in the magnetic tape. Recording means for adding and recording a discriminator, wherein the signal analyzer performs a phase comparison between each channel with respect to a reference signal for a plurality of channels reproduced from the magnetic tape at the time of error measurement, and Phase correction coefficient calculation means for obtaining a phase correction coefficient corresponding to the error; storage means for storing the phase correction coefficient obtained by the phase correction coefficient calculation means in association with an identifier; a reception signal reproduced from the magnetic tape , And a phase correction coefficient corresponding to the extracted identifier is read out from the storage means, and the phase of the received signal is shifted by the read phase correction coefficient, so that the received signal is recorded and reproduced. And a phase error correcting means for correcting a phase error between given channels. 2. A plurality of signal recording devices for receiving radio waves of a plurality of channels and recording received signals of the plurality of channels on a magnetic tape running between a pair of reels using a rotary head, and a plurality of signal recording devices. A signal analysis device including a signal analysis device that reproduces and analyzes received signals of a plurality of channels using a rotary head, wherein the signal analysis device identifies each of the plurality of signal recording devices A storage means for storing a phase correction coefficient in association with an identifier for performing the measurement, a reference signal obtaining means for obtaining a reference signal common to the received signals of the plurality of channels at the time of error measurement, and at the time of recording on a magnetic tape. An identifier for identifying the own device is assigned to each of the received signals of a plurality of channels for each channel. Recording means for recording the reference signal obtained by the reference signal obtaining means in place of the reception signal of the channel by assigning an identifier for identifying the own device to the recording area of each of the plurality of channels in the magnetic tape. A signal recording apparatus characterized in that a signal analyzer extracts an identifier given to a received signal reproduced from a magnetic tape, thereby correcting a phase error given to the received signal. 3. A plurality of signal recording devices for receiving radio waves of a plurality of channels and recording the received signals of the plurality of channels on a magnetic tape running between a pair of reels using a rotary head, and a plurality of signal recording devices. A signal analysis device used for a signal analysis system including a signal analysis device that reproduces and analyzes received signals of a plurality of channels using a rotary head, wherein the plurality of signal recording devices are used when recording on a magnetic tape. ,
An identifier for identifying the own device is assigned to each of the received signals of the plurality of channels, and at the time of error measurement, the reference signal obtained by the reference signal obtaining means is replaced with the reference signal obtained by the reference signal obtaining means in place of the received signals of the plurality of channels. When recording the recording area of each of a plurality of channels in a tape with an identifier for identifying the apparatus itself, when an error is measured, a reference signal for a plurality of channels reproduced from the magnetic tape is transmitted between the respective channels. Phase correction coefficient calculating means for performing phase comparison and obtaining a phase correction coefficient corresponding to a phase error; storage means for storing the phase correction coefficient obtained by the phase correction coefficient calculating means in association with an identifier; and the magnetic tape And extracting a phase correction coefficient corresponding to the extracted identifier from the storage means. Phase error correction means for correcting a phase error between channels given to the received signal at the time of recording / reproduction by shifting the phase of the received signal by the read phase correction coefficient. Analysis device. 4. A plurality of signal recording devices for receiving radio waves of a plurality of channels and recording the received signals of the plurality of channels on a magnetic tape running between a pair of reels using a rotary head, and a plurality of signal recording devices. A signal analysis device used in a signal analysis system including a signal analysis device that reproduces and analyzes received signals of a plurality of channels by using a rotary head, the phase error between channels given to the received signals of the plurality of channels, A storage medium storing a control program used for correction, wherein a phase comparison is performed between each channel with respect to a reference signal for a plurality of channels reproduced from the magnetic tape at the time of error measurement, and a phase error corresponding to the phase error is measured. A first step of obtaining a phase correction coefficient, and associating the phase correction coefficient obtained in the first step with an identifier. A second step of storing in a correction table by extracting an identifier added to a received signal reproduced from the magnetic tape, reading a phase correction coefficient corresponding to the extracted identifier from the correction table, A third step of correcting a phase error between channels given to the received signal at the time of recording / reproducing by shifting the phase of the corresponding received signal by a phase correction coefficient.