JP2018163090A - Digital rf memory device, recording method, and reproduction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easy to reproduce a RF signal as a signal having a plurality of frequency components included (reproduction data) after a recording of the RF signal is completed as recording data (addition data) to simultaneously transmit the reproduction data.SOLUTION: A digital memory device is configured to make recording data to be sequentially input alternatively recorded in a first record data storage area or a second record data storage area; read already recorded recording data from the first record data storage area in which record data recording processing is not executed or the second record data storage area therein; read already recorded addition data from a first addition data storage area in which addition data recording processing is not executed or a second addition data storage area therein; and make the read record data and addition data recorded in the first addition data storage area or the second addition data storage area which is different from a reading source of the read addition data as new addition data by conducting the addition processing of adding the read record data and addition data.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a digital RF memory device for recording an RF signal such as a radar signal (received signal) as recording data, a recording method, and a reproducing method.

  An apparatus that records an RF (Radio Frequency) signal such as a radar signal (received signal) may be used in combination with an apparatus that reproduces the recorded RF signal. Such an apparatus, that is, an RF signal recording / reproducing apparatus, receives and records radio waves such as radar waves and communication waves including a plurality of frequency components, and reproduces the received radio waves as signals including a plurality of frequency components. It is used for a recording function of a radio wave application apparatus (for example, see Patent Document 1) for transmitting and a radar echo generation apparatus (for example, see Patent Document 2) for evaluating the performance of the radar apparatus.

  In an RF signal recording / reproducing device (RF signal recording device), an RF signal is recorded in a digital RF memory device (digital storage device). A digital RF memory (DRFM) device performs A / D conversion of an RF signal and records (stores) the signal in a memory for storage. (For example, refer to Patent Document 3). The digital signal recorded in the memory of the digital RF memory device is read from the memory under the control of the memory control unit. Further, the digital RF memory device can perform frequency modulation before D / A conversion when reproducing the stored RF signal (recorded digital signal).

  As a conventional RF signal recording / reproducing apparatus, there is a radio wave application apparatus that reproduces a received RF signal as a signal including a plurality of frequency components and transmits it simultaneously (for example, see Patent Document 1). Further, some conventional RF signal recording / reproducing devices (RF signal recording devices) have a plurality of digital RF memory devices, and some of the RF signal bands recorded by the two digital RF memory devices partially overlap. (For example, refer to Patent Document 2). By doing so, the target of the RF signal to be recorded can be widened. With this broadening of the bandwidth, the RF signal recording device can transmit a radar signal (reception) transmitted from a radar device (communication device) that uses a method of spreading the spectrum (frequency hopping method) by changing the frequency of the carrier wave with time. Signal) can also be recorded.

JP 2002-277531 A JP-A-2005-91170 Japanese Patent Laid-Open No. 9-73769

  In the timing chart disclosed in FIG. 2 of Patent Document 1, a waveform indicating that the received RF signal is reproduced as a signal including a plurality of frequency components and transmitted simultaneously is illustrated. On the other hand, in the timing chart disclosed in FIG. 3 of Patent Document 2, a waveform is shown as if reproduction is started immediately after recording is completed using an RF signal as a digital signal (recording data). ing. However, the RF signal recording / reproducing apparatus (RF signal recording apparatus) as disclosed in Patent Document 1 and Patent Document 2 outputs a plurality of frequency components immediately after recording is completed using the RF signal as a digital signal (recording data). There is a problem that reproduction and simultaneous transmission as a signal to be included are not considered. The memory control unit disclosed in Patent Document 3 is for reproducing a phase shift signal when reading a digital signal from the memory. Therefore, an operation for reproducing as a signal including a plurality of frequency components immediately after the recording of the RF signal as a digital signal is not disclosed.

  The present invention has been made to solve the above-described problems. Immediately after the recording is completed using the RF signal as recording data (addition data), the signal (reproduction data) includes a plurality of frequency components. It is an object of the present invention to obtain a digital RF memory device, a recording method, and a reproducing method for recording recording data (additional data) so that it can be easily reproduced and transmitted simultaneously.

  According to the present invention, an RF signal transmitted from an apparatus using a frequency hopping method is recorded as recording data for each hopping channel, and the recording data sequentially input are alternately recorded in a first recording data storage area or a first recording data storage area. 2 The recorded data is recorded in the recording data storage area, the recording data already recorded is read from the first recording data storage area or the second recording data storage area where the recording data recording process is not executed, and the addition data An addition process is performed in which addition data that has already been recorded is read from the first addition data storage area or the second addition data storage area that has not been recorded, and the read record data and addition data are added. As the new addition data, the first addition data which is different from the read source of the addition data read is obtained. Is characterized in that to record to the storage area or the second addition data storage area performing said addition data recording processing.

  According to the present invention, the first addition data storage area or the second addition data which is different from the reading source of the read addition data is added as new addition data by performing an addition process of adding the read recording data and the addition data. A digital RF memory device capable of providing reproduction data that can be easily reproduced and transmitted as a signal (reproduction data) including a plurality of frequency components immediately after recording is completed by recording in the storage area, recording Method and regeneration method can be obtained.

It is a functional block diagram which shows the structure of RF signal recording device (RF signal recording / reproducing apparatus) based on Embodiment 1 of this invention. 1 is a functional block diagram showing a configuration of a digital RF memory device (digital RF memory unit of an RF signal recording device (RF signal recording / reproducing device)) according to Embodiment 1 of the present invention. It is a functional block diagram which shows the structure of the receiving part of RF signal recording device (RF signal recording / reproducing apparatus) based on Embodiment 1 of this invention. It is a functional block diagram which shows the structure of the modulation | alteration / transmission part of RF signal recording device (RF signal recording / reproducing apparatus) based on Embodiment 1 of this invention. FIG. 4 is a schematic diagram (received pulse synchronization) of waveforms recorded (added) in the memory unit of the digital RF memory device (digital RF memory unit of the RF signal recording device (RF signal recording / reproducing device)) according to the first embodiment of the present invention. is there. FIG. 5 is a schematic diagram (asynchronized reception pulse) of a waveform recorded (added) in the memory unit of the digital RF memory device (digital RF memory unit of the RF signal recording device (RF signal recording / reproducing device)) according to Embodiment 1 of the present invention; is there. It is a schematic diagram which shows the process until reproduction | regeneration of RF signal using the digital RF memory device based on Embodiment 1 of this invention. It is a schematic diagram which shows the comparative example with respect to the schematic diagram which shows the process until reproduction | regeneration of RF signal using the digital RF memory device based on Embodiment 1 of this invention. It is a schematic diagram which shows each process of recording, addition, and reproduction | regeneration of RF signal using the digital RF memory apparatus based on Embodiment 1 of this invention. It is a flowchart which shows a part of process step (until recording start) of the recording method using the digital RF memory device based on Embodiment 1 of this invention. It is a flowchart which shows a part (from recording start to the completion | finish of addition) of the processing step of the recording method using the digital RF memory device based on Embodiment 1 of this invention. It is a flowchart which shows the processing step of the reproducing | regenerating method using the digital RF memory device based on Embodiment 1 of this invention. 4 is a table showing RF signal recording, addition, and reproduction data in the recording method using the digital RF memory device according to the first embodiment of the present invention.

Embodiment 1 FIG.
A digital RF memory device according to Embodiment 1 of the present invention and an RF signal recording device and RF signal recording / reproducing device according to Embodiment 1 will be described below with reference to FIGS. The description of the same reference numerals and the same language in the drawings may be omitted. The digital RF memory device (DRFM device) according to the first embodiment corresponds to the digital RF memory unit 3 (DRFM unit 3) of the RF signal recording device and the RF signal recording / reproducing device according to the first embodiment. Specifically, the digital RF memory unit 3 records an RF signal transmitted from a transmission station (not shown) as a device using a frequency hopping method as recording data for each hopping channel. The RF signal transmitted from the transmitting station can be said to be a hopping signal. In addition, the digital RF memory unit 3 plus the receiving antenna unit 1 and the receiving unit 3 is the basic configuration of the RF signal recording apparatus according to the first embodiment. The RF signal recording apparatus to which a modulation / transmission unit 5 and a transmission antenna unit 6 are added is a basic configuration of the RF signal recording / reproducing apparatus according to the first embodiment.

1 to 4, the receiving antenna unit 1 sequentially receives RF signals transmitted (transmitted) from a transmitting station using a frequency hopping method. The transmitting station hops the frequency at a predetermined hopping rate in the range of frequencies f _{1 to} f _n (n is an integer), and transmits an RF signal that is a hopping signal. Each of the frequencies f _{1 to} f _n is also called a hopping channel (hopping frequency). Further, the range of f _n is the upper limit of f _1, which is the lower limit of the hopping channel is called the hopping frequency range. The receiving unit 2 frequency-converts (down-converts) the RF signal received by the receiving antenna unit 1 into an IF (Intermediate Frequency) signal that is an intermediate frequency signal, and further digitally converts the signal by A / D conversion. It is to be recorded data. The IF signal in this case is called a recording signal. The digital RF memory unit 3 records and reproduces the recording data A / D converted by the receiving unit 2. The digital RF memory unit 3 can record an RF signal as recording data for each hopping channel.

  1 to 4, the recording / reproduction control unit 4 is formed inside the digital RF memory unit 3. The recording / reproduction control unit 4 controls recording processing and addition processing of recording data and reproduction processing of recording data (reproduction data). What added recording data may be called reproduction data. The modulation / transmission unit 5 performs D / A conversion of the reproduction data into an IF signal that is an intermediate frequency signal, and converts the reproduction data into an RF signal by frequency conversion (up-conversion). The IF signal in this case is called a reproduction signal. The transmission antenna unit 2 transmits the RF signal generated by the modulation / transmission unit 5. At this time, by transmitting an RF signal from the transmission antenna unit 2 toward the transmission station, it is possible to cause radio wave interference with the RF signal transmitted from the transmission station using the frequency hopping method. The digital RF memory device (RF signal recording / reproducing device) according to the first embodiment can easily function as a radio wave application device. Of course, in the digital RF memory device (RF signal recording device, RF signal recording / reproducing device) according to the first embodiment, the recording / reproducing control unit 4 performs the recording process and the adding process of the recording data. It can be used for the recording function of a radar echo generator for evaluating performance.

  1 to 4, the data table creation unit 7 creates recording unit time (hopping rate), recording time, and reproduction pulse width setting values as a table, assuming a transmitting station that is a device using a frequency hopping method. To do. A recording unit time, a recording time, and a reproduction pulse width setting value may be created for each transmission station. The recording time is recording unit time (hopping rate) × number of hopping channels. The reproduction pulse width setting value is the pulse width of the reproduction signal when reproducing the reproduction signal and transmitting the RF signal.

  When the digital RF memory unit 3 starts recording the recording data by the recording start trigger, the recording data is from the head of the pulse of the RF signal to the recording unit time, and the reception pulse synchronization can be realized. By receiving pulse synchronization, the dead time (corresponding to the time of “hopping rate-reproduction pulse width”) can be rejected from the recorded data (reproduced data), and reproduction can be performed without the dead time during recording or reproduction. The pulse width of the reproduction signal is only the hopping rate minus the dead time, that is, only the pulse portion. On the other hand, when reception pulse synchronization is not realized, that is, when recording of recording data is started at an arbitrary timing regardless of the recording start trigger, the boundary between the reception pulse and the dead time is unknown. The pulse width of the reproduction signal corresponds to the hopping rate itself.

  The data table recording unit 8 records the recording unit time, recording time, and reproduction pulse width setting value sent from the data table creation unit 7. In the figure, the recording unit time (hopping rate), the recording time, and the reproduction pulse width setting value are described as “data” for the sake of simplicity. The data table creation unit 7 may send data for each transmission station to the data table recording unit 8 as necessary, or may send data for a plurality of transmission stations to the data table recording unit 8 at one time. The data table recording unit 8 supplies the recording unit time, the recording time, and the reproduction pulse width setting value to the recording / reproduction control unit 4. The data table creation unit 7 and the data table recording unit 8 may be referred to as a data table recording unit or a data table unit as a single unit or the data table recording unit 8 alone.

  The data table creation unit 7 and the table recording unit 8 are a part of the configuration of the digital RF memory device according to the first embodiment, or the RF signal recording device and the RF signal recording / reproducing device according to the first embodiment, and the internal configuration. It is good. Of course, a table of recording unit time / recording time / reproduction pulse width setting value may be stored by using a part of the area of the memory unit 31 described later. Note that the playback pulse width setting value is “reproduction pulse width = recording unit time (hopping rate)” when recording of recording data is started at an arbitrary timing, that is, when the reception pulse is asynchronous. In this data, the reproduction pulse width setting value and the hopping rate need not be distinguished and managed. When recording of recording data is started by the recording start trigger, the reproduction pulse width setting value is “reproduction pulse width = reception pulse width”.

  Here, the operation of the RF signal recording apparatus according to the first embodiment will be described with reference to FIGS. First, the operations of the receiving antenna unit 1 and the receiving unit 2 will be described with reference to FIG. When the receiving antenna unit 1 receives the RF signal transmitted from the transmitting station, the RF signal is sent to the receiving unit 2. As illustrated in FIG. 3, the reception unit 2 includes a frequency conversion unit (down converter) 21, a first band pass filter unit (first BPF unit) 22, an A / D conversion unit 23, and a second band pass filter unit (second BPF). Part) 24, an OR gate 25, and a trigger generator 26. The frequency conversion unit 21 performs frequency conversion (down-conversion) on the RF signal received by the reception antenna unit 1, and the first band-pass filter unit 22 filters to obtain a recording signal (IF signal). The first band-pass filter unit 22 is a band-pass filter (BPF: Band Pass Filter) that covers the entire hopping frequency range. The A / D conversion unit 23 converts the recording signal filtered by the first band pass filter unit 22 into digital recording data by performing A / D conversion. This recording data is sent to the digital RF memory unit 3.

  As shown in FIG. 3, the receiving unit 2 not only sends recording data to the digital RF memory unit 3, but also generates a trigger (recording start trigger) when the digital RF memory unit 3 records the recording data. Also good. By this trigger, the digital RF memory unit 3 can generate reproduction data in accordance with the hopping rate. A distributor is provided between the frequency conversion unit 21 and the first bandpass filter unit 22, and a part of the frequency-converted (down-converted) RF signal is input to the second bandpass filter unit 24. The second bandpass filter unit 24 is a bandpass filter (BPF) that covers at least a part of the hopping frequency range. Since the range covered by the second bandpass filter unit 24 is narrower than that of the first bandpass filter unit 22, the S / N ratio is improved. Therefore, the second bandpass filter unit 24 includes the first bandpass filter unit There is an advantage that the sensitivity can be higher than 22.

  The OR gate 25 is a logical gate of a logical sum that is configured to receive the first BPF signal and the second BPF signal. The first BPF signal is provided with a distributor between the first band-pass filter unit 22 and the A / D conversion unit 23, and a part of the signal that has passed through the first band-pass filter unit 22 is branched. The detector is not shown). The first BPF section signal is a signal that has been detected through the second bandpass filter section 24 (the illustration of the detector is omitted) after the second bandpass filter section 24. The OR gate 25 causes the trigger generation unit 26 in the subsequent stage to generate a trigger when at least one of the first BPF signal and the second BPF signal is input. The trigger generation unit 26 sends the trigger to the digital RF memory unit 3.

  When the RF signal sent to the receiving unit 2 is very small, the receiving unit 2 may not be detected as a first BPF unit signal by detection. However, if the RF signal sent to the receiving unit 2 has a frequency in the range covered by the second bandpass filter unit 24, it is detected as a second BPF unit signal by detection, and therefore, the OR gate 25 receives the second BPF. Since the signal is input, the trigger generator 26 can generate a trigger (recording start trigger) even if the RF signal is very small. The trigger (recording start trigger) is sent to the digital RF memory unit 3 (recording / addition control unit 40). In response to this trigger (recording start trigger) generated from information obtained by detecting the RF signal by the receiving unit 2 that receives the RF signal, the recording / addition control unit 40 causes the memory unit 31 to start recording data recording processing. . In other words, it can be said that reception pulse synchronization is executed. On the contrary, when the reception pulse asynchronization is executed, the recording / addition control unit 40 may start recording the recording data at an arbitrary timing. The recording / addition control unit 40 causes the memory unit to execute recording data recording processing and addition data recording processing until the end of the hopping cycle of the frequency hopping method. The recording data recording process, the addition data process, and the memory unit 31 will be described later.

  Next, the operation of the digital RF memory unit 3 will be described with reference to FIG. The digital RF memory unit 3 includes a memory unit 31 in addition to the recording / reproduction control unit 4. The recording / reproduction control unit 4 includes a recording / addition control unit 40 and a reproduction control unit 43. The reproduction control unit 43 is a configuration of an RF signal recording / reproducing apparatus. Therefore, the reproduction control unit 43 will be described when explaining the RF signal recording / reproducing apparatus. The memory unit 31 records recording data. Here, addition data, which will be described later, is also included in the recording data. The recording / addition control unit 40 causes the memory unit 31 to record recording data. That is, the recording data is recorded in the memory unit 31 under the control of the recording / addition control unit 40. The recording / reproducing control unit 4 is formed inside the digital RF memory unit 3. The recording / playback control unit 4 can be formed by using an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit).

  As shown in FIG. 2, the memory unit 31 includes a recording data storage area 32 that is an area for recording (storing) recording data, and an additional data storage area that is an area for recording (storing) addition data obtained by adding the recording data. 35. The recording data storage area 32 has at least a first recording data storage area 33 (area A33) and a second recording data storage area 34 (area B34). The addition data storage area 35 has at least a first addition data storage area 36 (area C36) and a second addition data storage area 37 (area D37). The recording data output from the receiving unit 2 is first recorded in either the area A33 or the area B34 of the recording data storage area 32, and the recording data sent sequentially is either the area A33 or the area B34. It is recorded on either side.

  As shown in FIG. 2, the recording / addition control unit 40 includes a buffer (recording side) 41 and an addition processing unit 42. The buffer 41 is a gate circuit that sends recording data to the memory unit 31 in response to a trigger from the trigger generation unit 26 (reception unit 2). The recording data sent sequentially is recorded in either one of the areas A33 and B34. At least the first determination of the recording area may be obtained from an external control circuit together with a trigger. The addition processing unit 42 reads and adds the recording data recorded in the recording data storage area 32 and records it in the addition data storage area 35. After the second recording data, the addition processing unit 42 reads and adds the addition data recorded in the addition data storage area 35 in addition to the recording data recorded in the recording data storage area 32, and adds a new addition. Data is recorded in the added data storage area 35 as data.

The addition performed by the addition processing unit 42 means that information on the frequency (hopping channel) of the RF signals that arrive sequentially is collected, and is different from the addition of the four arithmetic operations. For example, when the incoming RF signal is hopped n times, each recording data has n pieces of frequency f ₁ , frequency f ₂ , frequency f ₃ ,..., Frequency f _n , and n pieces of individual data It is data of. In order of arrival, “frequency f ₁ + frequency f ₂ ”, “frequency f ₁ + frequency f ₂ + frequency f ₃ ”, “frequency f ₁ + frequency f ₂ + frequency f ₃ + frequency f ₄ ” are added. Finally, the control of the process of recording the addition data “frequency f ₁ + frequency f ₂ + frequency f ₃ + frequency f ₄ +. + Frequency f _n−1 + frequency f _n ” in the addition data storage area 35 is performed. The addition processing unit 42 performs this. Here, in order to simplify the description, the case where the RF signals of all hopping channels arrive from the transmitting station in the order of low frequency is given as an example, but the present invention is not limited to this. Similarly, in the other description, “the order in which the frequency is low and the RF signals of all hopping channels arrive from the transmitting station” are similarly used.

  As described above, the memory unit 31 has at least two areas A33 and B34 for recording and storing recording data, and an area for recording and storing addition data obtained by adding the recording data is an area C36. And at least two storage areas D37. Therefore, the digital RF memory device (digital RF memory unit 3) according to the first embodiment uses the fact that the recording data is alternately recorded in the area A33 and the area B34 via the buffer 41, and stores the recording data. Can be added in parallel.

  The recording data recording process and the additional data recording process in the recording / addition control unit 40 and the memory unit 31 are performed by using the data table recording unit 8 to record recording unit time (hopping rate) and recording time (recording unit time × number of hopping channels) As a result, it is possible to obtain a recording data recording cycle. Therefore, the recording / addition control unit 40 (addition processing unit 42) determines a channel (hopping channel) to be recorded as recording data and a data length of the recording data from the recording unit time (hopping rate) and the number of hopping channels. be able to. In this case, the data table unit may hold a combination of the frequency hopping recording unit time (hopping rate) and the number of hopping channels as a table.

  The recording / addition control unit 40 (addition processing unit 42) executes a recording data recording process in which the recording data that is sequentially input is alternately recorded in the first recording data storage area or the second recording data storage area in the memory unit 31. Let In parallel, the recording / addition control unit 40 (addition processing unit 42) performs recording data reading processing for reading recording data that has already been recorded from the region A33 or the region B34 that is not executing this recording data recording processing. Do. An addition data reading process for reading addition data that has already been recorded from the area C36 or the area D37 that is not executed by the memory unit 31 in an addition data recording process to be described later is performed by a recording / addition control unit 40 (addition processing unit 42). ) Will do. The recording / addition control unit 40 (addition processing unit 42) performs addition processing for adding the recording data read by the recording data reading processing and the addition data read by the addition data reading processing to obtain new addition data. In order to obtain this new addition data, the recording / addition control unit 40 (addition processing unit 42) creates a new region C36 or region D37 that is different from the source from which the addition data read in the addition data reading process is read. The memory unit 31 is caused to execute an addition data recording process for recording the addition data. The recording / addition control unit 40 (addition processing unit 42) causes the memory unit 31 to execute recording data recording processing and addition data recording processing until the end of the frequency hopping hopping cycle.

  When the addition data reading process is performed to perform the addition data recording process for the first time when the addition data reading process is performed, the addition data is not present in the addition data storage area 35. There is no additional data. In this case, in the addition data recording process, the addition data (none) is added to the recording data read in the recording data reading process. As a result, the recording data itself read in the recording data reading process is added. Data (corresponding to the above-mentioned “new addition data”).

  In the case of reception pulse synchronization, the recording / addition control unit 40 determines a portion having no information (dead time) for each recording data from the trigger, the reproduction pulse width and the hopping rate, and a portion having no information (dead time) is a memory unit By rejecting from 31 or recording in the memory unit 31 other than the part without information (dead time), the reproduction data (recording data) can be only the pulse part. Rejection of dead time may be executed during the recording data recording process or may be executed during the addition data recording process. Further, when the reproduction control unit 43 to be described later reads and reproduces the addition data recorded in the memory unit 31 by the addition data recording process performed last, the recording / addition control unit 40 collectively sets the dead time. You may reject from addition data (reproduction data). The addition data recording process performed last is the last addition in which the recording / addition control unit 40 has performed the recording data recording process and the addition data recording process executed by the memory unit 31 until the end of the hopping cycle. It means data recording process.

  In the digital RF memory device (RF signal recording device, RF signal recording / reproducing device) according to the first embodiment, a series of operations in which the recording / addition control unit 40 performs addition processing and performs addition data recording processing by the memory unit 31. In the meantime, the recording data recording processing by the memory unit 31 is executed in parallel, so that the processing can be further speeded up. When this series of operations ends, the recording / addition control unit 40 ends the recording data recording process by the memory unit 31 that has been executed in parallel, so that the reproduction control unit 43 (to be described later) The operation can also be speeded up.

  Next, the operation of the RF signal recording / reproducing apparatus according to the first embodiment will be described with reference to FIGS. 1, 2, 4, 5, and 6. FIG. First, the operation of the digital RF memory unit 3 will be described. As shown in FIG. 2, the digital RF memory unit 3 includes a recording / playback control unit 4 and a memory unit 31. The recording / reproduction control unit 4 includes a recording / addition control unit 40 and a reproduction control unit 43. The operation of the recording / addition control unit 40 is the same as that in the description of the RF signal recording / reproducing apparatus. The reproduction control unit 43 reads out and reproduces the addition data recorded in the memory unit 31 by the recording / addition control unit 40. That is, under the control of the reproduction control unit 43, the added data of the recorded data is read from the memory unit 31 and reproduced. As described above, the recording / reproducing control unit 4 is formed inside the digital RF memory unit 3. The recording / reproducing control unit 4 can be formed by using FPGA or ASIC.

  As shown in FIG. 2, the memory unit 31 has an added data storage area 35 that is an area for recording (storing) added data obtained by adding recorded data. The addition data storage area 35 has at least a first addition data storage area 36 (area C36) and a second addition data storage area 37 (area D37). In either one of the areas C36 and C37, the recording / addition control unit 40 performs the recording data recording process and the addition data recording process performed by the memory unit 31 until the end of the hopping cycle. The added data recorded by (1) is recorded (stored). That is, the reproduction control unit 43 reads and reproduces the addition data recorded in the memory unit 31 by the addition data recording process performed last.

  As shown in FIG. 2, the reproduction control unit 43 has a pulse width setting unit 44 and a buffer (reproduction side) 45. The buffer 45 is a gate circuit that sequentially sends addition data (reproduction data) to the modulation / transmission unit 5 in accordance with the reproduction pulse width set by the pulse width setting unit 44. The pulse width setting unit 44 reads the addition data recorded in the addition data storage area 35 and determines the reproduction pulse width. This reproduction pulse width is determined by a reproduction pulse width setting value sent from the data table storage unit 8 (data table unit) to the recording / reproduction control unit 4 (reproduction control unit 43).

  That is, the reproduction control unit 43 reads the added data from the memory unit and reproduces it. The data table storage unit 8 (data table unit) further has information on the pulse width of the RF signal in a table of combinations of the hopping rate and the number of hopping channels, and the reproduction control unit 43 adds the added data from the pulse width information. It can be said that this determines the pulse width when reproducing the. In other words, the reproduction control unit 43 reads and reproduces from the memory unit 31 other than “a portion where there is no information for each recording data obtained from the trigger (recording start trigger) and the hopping rate”.

FIG. 5 is a schematic diagram (received pulse synchronization) of a waveform recorded (added) in a memory unit of a digital RF memory device (digital RF memory unit of an RF signal recording device (RF signal recording / reproducing device)). The carriers f _{1 to} f _n are “portions where there is information for each recording data obtained from the trigger (recording start trigger) and the hopping rate”. The reproduction control unit 43 is recorded data (after addition), that is, the addition data is recorded by rejecting the dead time from the addition data (reproduction data) as shown in FIG. If there is, the reproduction pulse width of the reproduction signal (after addition) may be obtained by subtracting the dead time from the reproduction pulse width setting value (hopping rate). Further, if the addition data (reproduction data) is recorded by synchronization with the reception pulse, but the addition data does not deduct the dead time, the reproduction is performed with the dead time omitted during reproduction. The reproduction pulse width at this time is also the value obtained by subtracting the dead time from the reproduction pulse width setting value (hopping rate). As shown in FIG. 5, the RF signal recording / reproducing apparatus can repeatedly reproduce application signals (reproduction frequencies f _{1 to} f _n ).

FIG. 6 is a schematic diagram (asynchronized reception pulse) of a waveform recorded (added) in a memory section of a digital RF memory apparatus (digital RF memory section of an RF signal recording apparatus (RF signal recording / reproducing apparatus)). The carriers f _{1 to} f _n are “portions where there is information for each recording data”. When the reception pulse is not synchronized, that is, when the reception pulse is asynchronous, the reproduction control unit 43 determines that the reproduction pulse width of the reproduction signal (after addition) is the data table storage unit 8 (data table unit) because the dead time is unknown. To the reproduction pulse width setting value itself sent to the recording / reproduction control unit 4 (reproduction control unit 43). In other words, it becomes the hopping rate itself. In this case, the dead time is also reproduced. That is, a time without a pulse occurs during reproduction. However, in this case, since the reception pulse is asynchronous, the configuration of the RF signal recording / reproducing apparatus (digital RF memory apparatus) can be simplified. As shown in FIG. 6, the RF signal recording / reproducing apparatus can repeatedly reproduce application signals (reproduction frequencies f _{1 to} f _n ). Reception pulse synchronization and reception pulse asynchronization are called recording modes.

  Next, operations of the modulation / transmission unit 5 and the transmission antenna unit 6 shown in FIG. 4 will be described. The modulation / transmission unit 5 includes a D / A conversion unit 51, a limiter amplifier unit 52, and a frequency conversion unit (upconverter) 53. The modulation / transmission unit 5 performs modulation for restoring the RF signal based on the IF signal. The D / A conversion unit 51 converts the digital reproduction data (addition data) sent from the recording / reproduction control unit 4 (reproduction control unit 43) into an analog reproduction signal (IF signal) by D / A conversion. . The limiter amplifier unit 52 is used to amplify the amplitude of the reproduction signal (IF signal) to a saturation region to obtain a stable output. This is because the reproduction signal (IF signal) is obtained by adding the phases of a plurality of frequencies, and when adding and synthesizing different phases, the amplitude is increased or decreased. is there. When a plurality of DRFM devices (digital RF memory devices) as disclosed in Patent Document 1 are applied to the digital RF memory device according to the first embodiment, it is preferable to use the limiter amplifier unit 52. When using a plurality of DRFM devices (digital RF memory devices) and switching the reproduction signal, a normal amplifier (not shown) may be used. However, when combining and using a plurality of reproduction data, it is necessary to use the limiter amplifier unit 52 as described above.

  The frequency conversion unit 53 shown in FIG. 4 performs frequency conversion (up-conversion) on the reproduction signal (IF signal) amplified by the limiter amplifier unit 52 to obtain an RF signal, and the frequency conversion unit 21 receives the reception antenna unit 1. The converted RF signal is frequency-converted (down-converted) and sent to the transmitting antenna unit 6. The transmission antenna unit 6 transmits (sends) the RF signal transmitted from the frequency conversion unit 21 to space. If the RF signal transmitted (transmitted) from the transmitting antenna unit 6 is directed to the transmitting station, radio wave interference can be generated with the RF signal transmitted from the transmitting station. In this case, the RF signal transmitted from the transmission antenna unit 6 can be said to be an applied signal.

  As described above, the digital RF memory device (RF signal recording device, RF signal recording / reproducing device) according to the first embodiment performs addition processing for adding the read recording data and addition data, and reads it as new addition data. By recording in the region C36 or the region D37 which is different from the source from which the addition data is read, immediately after the recording is completed, it can be reproduced and transmitted simultaneously as a signal (reproduction data) including a plurality of frequency components. It is possible to provide easy reproduction data.

FIG. 7 is a schematic diagram showing a process up to reproduction of an RF signal using such a digital RF memory device. In FIG. 7, the vertical axis represents frequency f (hopping channel), and the horizontal axis represents time t. By using the digital RF memory device according to the first embodiment, as shown in FIG. 7, after the hopping cycle is finished (after the recording is finished), the addition is also finished quickly. Recording data) can be immediately reproduced as an RF signal (application signal). Recording start may be started using a trigger (recording start trigger). Addition starts immediately after recording starts. FIG. 7 shows a state in which the application signal interferes with the hopping signal by the application signal over the hopping period, three times or more. That is, the RF signal recording / reproducing apparatus can repeatedly reproduce the applied signal (reproduction frequencies f _{1 to} f _n ).

  FIG. 8 is a schematic diagram showing a comparative example with respect to a schematic diagram showing a process until reproduction of an RF signal using the digital RF memory device shown in FIG. That is, the process up to the reproduction of the RF signal in the RF signal recording / reproducing apparatus to which the digital RF memory device according to the first embodiment is not applied is shown. In FIG. 8, the vertical axis represents frequency f (hopping channel), and the horizontal axis represents time t. As shown in FIG. 8, after the end of the hopping period (after the end of recording), the processor of the RF signal recording / reproducing apparatus reads the recording data. Thereafter, since the processor starts addition of the recording data, the reproduction data (addition data, recording data after the addition) can be reproduced as an RF signal (application signal) only after the processor processing time is over. Therefore, it is difficult to immediately reproduce the reproduction data (addition data, recording data after addition) as an RF signal (application signal). FIG. 8 shows a state in which the hopping signal is gradually interfered by the applied signal after the end of the processor processing time.

FIG. 9 is a schematic diagram showing each process of recording, adding, and reproducing an RF signal using the digital RF memory device according to the first embodiment. FIG. 9 is a schematic diagram showing a process up to reproduction of an RF signal using the digital RF memory device shown in FIG. The arrival time here refers to the time at which the RF signal, which is a hopping signal (transmission frequency f _{1 to} f _n ) from the transmission station, reaches the reception unit 2 and the applied signal (reproduction frequency f) from the modulation / transmission unit 5. _{1 to} f _n ) means the time for the RF signal to reach the transmitting station as the transmitting station arrival frequencies f _{1 to} f _n .

As shown in FIG. 9, the RF signal (hopping signal) transmitted from the transmitting station reaches the receiving unit 2 via the receiving antenna unit 1 after the arrival time. As a data link incoming wave received and processed by the receiving unit 2, the digital RF memory device (digital RF memory unit 3) controls the memory unit 31 to perform recording processing and addition processing. From the start to the end (recording time) is a hopping cycle. By performing the addition process in parallel with the recording process, the final addition process (the portion indicated as the processing time in FIG. 9) is completed quickly at the end of the recording time. The modulation / transmission unit 5 reproduces the applied signal (reproduction frequencies f _{1 to} f _n ) in accordance with the hopping rate (reproduction unit). This application signal reaches the transmission station after the arrival time has elapsed, and interferes with the hopping signal transmitted from the transmission station. This interfering time is referred to as applicable time.

  Hereinafter, a recording method according to the first embodiment of the present invention (recording method using the digital RF memory device according to the first embodiment) and a reproducing method according to the first embodiment (reproducing using the digital RF memory device according to the first embodiment) Method). The recording method uses a digital RF memory device that records an RF signal transmitted from a device using a frequency hopping method as recording data for each hopping channel. The reproduction method uses a digital RF memory device that records an RF signal transmitted from a device using a frequency hopping method as recording data for each hopping channel and reproduces the data as reproduction data. That is, the recording method according to the first embodiment is a method using the RF signal recording apparatus (digital RF apparatus) according to the first embodiment. The reproducing method according to the first embodiment is a method using the RF signal recording / reproducing apparatus (digital RF apparatus) according to the first embodiment. A recording method and a reproducing method according to the first embodiment will be described with reference to FIG. 10, FIG. 11, and FIG. 10, 11, and 12, arrows indicate the flow of processing, and broken-line arrows indicate the flow of data. The description of the same reference numerals and the same language in the drawings may be omitted.

  The recording method according to the first embodiment includes at least a recording data recording processing step, a recording data reading step, an addition data reading step, and an addition data recording processing step. The recording method according to Embodiment 1 may further include any of a reception step, a recording mode determination step, and a recording start trigger determination step, which will be described later. In the recording data recording processing step, the recording data input from the receiving unit 2 are sequentially displayed as area A33 (memory area A and area A) or area B34 (memory area B and area B). This is a processing step of the recording / addition control unit 40 to be recorded. The recording data reading step is a processing step of the recording / addition control unit 40 that reads recording data that has already been recorded from the region A33 or the region B34 on which the recording data recording processing step has not been executed. When the recording data recording processing step is performed for the first time, there is no recording data.

  Subsequently, in the additional data reading step, the region C36 (shown as memory region C and region C) or the region D37 (shown as memory region D and region D) in which the later-described additional data recording processing step is not executed is shown. Therefore, the recording / addition control unit 40 reads the added data that has already been recorded. When the additional data recording processing step is performed for the first time, there is no additional data. In the addition data recording processing step described above, the addition processing for adding the recording data and the addition data read in the recording data reading step and the addition data reading step is performed, and the addition data read in the addition data reading step is added as new addition data. This is a processing step of the recording / addition control unit 40 for recording in the region C36 or the region D37 which is different from the reading source.

  FIG. 10 is a flowchart showing a part of processing steps (until the start of recording) of the recording method according to the first embodiment. That is, it can be said that the steps up to the start of recording among the recording data recording processing steps are included in the processing steps of the recording method according to the first embodiment. The reception step (STEP 1) is a processing step in which the reception antenna unit 1 receives an RF signal (hopping signal) from the transmission station and the reception unit 2 performs reception processing. The recording mode determination step (STEP 2) selects reception pulse synchronization or reception pulse asynchronous among the recording modes. The case where a trigger is obtained from the receiving unit 2 may be set as a recording mode in which the receiving pulse is synchronized, and the case where no trigger is obtained from the receiving unit 2 may be set as the recording mode in which the receiving pulse is asynchronous. The recording mode asynchronous with the received pulse may be selected.

  In the recording start trigger determination step (STEP 3), when the recording mode of the reception pulse is selected in the recording mode determination step (STEP 2), the trigger is sent until the trigger is sent to the recording / addition control unit 40. This is a processing step for proceeding to a recording data recording processing step (recording start step, STEP 4). When the recording mode asynchronous with the received pulse is selected in the recording mode determination step (STEP 2), the process proceeds to the recording data recording processing step (recording start step, STEP 5) as it is. STEP4 and STEP5 are the recording data recording processing steps described above. STEP 4 is different from STEP 5 in that reception pulse synchronization is achieved by a trigger. In addition, the recording data recording process in STEP 4 and STEP 5 (the same applies to the subsequent addition data recording process) is performed by recording the recording unit time (hopping rate) and recording time (recording unit time × number of hopping channels) from the data table recording unit 8. Is executed by obtaining a recording data recording cycle. The actual operation of STEP4 and STEP5 will be described with reference to FIG. The processing step transitions from A in FIG. 10 to A in FIG.

FIG. 11 is a flowchart showing a part of the processing steps (from the start of recording to the end of addition) of the recording method according to the first embodiment. That is, it can be said that the addition data recording processing step is included in the processing steps of the recording method according to the first embodiment from the start of the recording data recording processing step. In STEP 4 or STEP 5, the recording data is divided and recorded for each hopping channel (f _{1 to} f _n ).

  In the addition data recording processing step (STEP 6), the recording data divided and recorded in STEP 4 or STEP 5 are sequentially added. In order to sequentially add, a recording data reading step and an addition data reading step are performed in parallel with STEP 4 (STEP 5) and STEP 6. As described above, the recording data recording processing step (STEP 4 or STEP 5) is executed in parallel with the recording data reading step, the addition data reading step, and the addition data recording processing step (STEP 6), thereby enabling faster processing. it can. FIG. 11 illustrates the case where the first recording data is recorded in the area A33.

  Further, the addition data recording processing step (STEP 6) is ended (recording stopped) at least when the recording data recording processing step (STEP 4 (STEP 5)) executed in parallel is completed. , Preparation for regeneration is completed earlier. When the reproduction method according to the first embodiment is performed, the processing step is changed from B shown in FIG. 11 to B shown in FIG. When only the recording method according to the first embodiment is performed, B shown in FIG. 11 corresponds to the end.

  The reproduction method according to the first embodiment includes a reproduction step of reproducing the addition data recorded by the recording method according to the first embodiment. Of course, any of a reception step, a recording mode determination step, and a recording start trigger determination step may be included. Further, it may include any one of a reproduction pulse width setting processing step, a recording mode confirmation step, a data length specifying step 1, a data length specifying step 2, a transmission / reception setting step, and a transmission stop step, which will be described later. 12 shows processing steps of the reproduction method according to Embodiment 1 (reproduction pulse width setting processing step, recording mode confirmation step, data length designation step 1, data length designation step 2, reproduction step, transmission / reception setting step, transmission stop step. Is a flowchart showing.

In FIG. 12, the reproduction pulse width setting processing step (STEP 7) is a processing step of the reproduction control unit 43 that determines the pulse width for reproducing the applied signal (reproduction frequencies f _{1 to} f _n ).
In order to determine the pulse width for reproducing the application signal, the recording mode determined in the recording mode determination step (STEP 2) is confirmed in the recording mode confirmation step (STEP 8). When the reception pulse synchronous recording mode is selected, the process proceeds to the data length designation step 1 (STEP 9), and when the reception pulse asynchronous recording mode is selected, the process proceeds to the data length designation step 2 (STEP 10).

  The data length designation step 1 (STEP 9) is performed if the addition data is recorded by rejecting the dead time from the addition data (reproduction data) obtained from the region C36 or the region D37 by reception pulse synchronization. As shown in FIG. 5, a reproduction control unit 44 (pulse width) that uses a reproduction pulse width setting value (hopping rate) obtained from the data table storage unit 8 minus a dead time as a reproduction pulse width of the reproduction signal (after addition). This is a processing step of the setting unit 44). Note that the data length designation step 1 (STEP 9) is the addition data in which the addition data (reproduction data) is recorded in the region C36 or the region D37 by the reception pulse synchronization, but the dead time is not subtracted. For example, the reproduction control unit 44 (pulse width setting unit 44) performs a process of reproducing the dead time during reproduction. The reproduction pulse width at this time is also the value obtained by subtracting the dead time from the reproduction pulse width setting value (hopping rate). The data length specifying step 2 (STEP 10) is shown in FIG. 6 because the added data is not recorded by rejecting the dead time from the added data (reproduced data) obtained from the area C36 or the area D37 by asynchronous reception pulses. Thus, this is a processing step of the reproduction control unit 44 (pulse width setting unit 44) that sets the hopping rate to the reproduction pulse width of the reproduction signal (after addition).

The reproduction step (STEP 11) includes a modulation / transmission unit 5 and a transmission antenna unit that reproduce (including repetitive reproduction) the added data (reproduction data) having a reproduction pulse width determined as application signals (reproduction frequencies f _{1 to} f _n ). 6 processing steps. A data length designation step 1 (STEP 9) or a data length designation step 2 (STEP 10) for determining the pulse width when reproducing the added data from the pulse width information of the RF signal (hopping signal) of the transmitting station is a reproduction step (STEP 11). ). In this case, the reproduction step (STEP 11) is a processing step of the reproduction control unit 44 (pulse width setting unit 44), the modulation / transmission unit 5, and the transmission antenna unit 6.

In the transmission / reception setting step (STEP 12), it is determined whether the reproduction data (reproduction data) is repeatedly reproduced as an applied signal (reproduction frequencies f _{1 to} f _n ) or the reception step (STEP 1) is returned in the reproduction step (STEP 11). It is a processing step. In the case of repetitive reproduction, loop processing for repeatedly transmitting an applied signal (RF signal) transmitted from the transmission antenna unit 6 is performed. Stop transmission when newly receiving a hopping signal (RF signal) transmitted from a transmitting station (including those other than the transmitting station that transmitted the hopping signal that is the source of the application signal) or simply stopping transmission Proceed to step (STEP 13).

  The transmission stop step (STEP 13) is a processing step of the transmission antenna unit 6 that stops the application signal (RF signal). Stop transmission and receive a hopping signal (RF signal) newly transmitted from a transmitting station (including those other than the transmitting station that transmitted the hopping signal that is the source of the application signal). Return to. Further, when reproducing other reproduction data already recorded, the process returns to the reproduction pulse width setting step (STEP 7).

  FIG. 13 is a table showing RF signal recording, addition, and reproduction data in the recording method according to the first embodiment, and corresponds to the processing in the flowchart shown in FIG. The recording process in FIG. 13 corresponds to STEPs 4 and 5. The addition process corresponds to STEP6. The recording data recording area corresponds to the memory areas A and B in FIG. The added data recording area corresponds to the memory areas C and D in FIG. The addition formula indicates a combination of the memory areas A and B and the memory areas C and D to be read by the recording data reading step and the addition data reading step. The content of the addition data indicates the addition data recorded in the memory areas C and D.

1 receiving antenna part, 2 receiving part, 21 frequency conversion part (down converter),
22 1st band pass filter part (1st BPF part), 23 A / D conversion part,
24 second band pass filter unit (second BPF unit), 25 OR gate,
26 trigger generation unit, 3 digital RF memory unit (DRFM unit), 31 memory unit,
32 recording data storage area, 33 area A (first recording data storage area),
34 area B (second recording data storage area), 35 additional data storage area,
36 area C (first addition data storage area), 37 area B (second addition data storage area)
4 recording / playback control unit, 40 recording / addition control unit, 41 buffer (recording side),
42 addition processing unit, 43 reproduction control unit, 44 pulse width setting unit,
45 buffers (playback side), 5 modulation / transmission unit, 51 D / A conversion unit,
52 limiter amplifier, 53 frequency converter (upconverter),
6 transmitting antenna section, 7 data table creating section, 8 data table recording section.

Claims (15)

A digital RF memory device that records an RF signal transmitted from a device using a frequency hopping method as recording data for each hopping channel, wherein the recording unit records the recording data and the memory unit records the recording data. A recording / addition control unit
The memory unit has at least two areas for recording and storing the recording data, a first recording data storage area and a second recording data storage area, and records and stores addition data obtained by adding the recording data Having at least two areas, a first addition data storage area and a second addition data storage area,
The recording / addition control unit causes the memory unit to execute a recording data recording process for alternately recording the recording data that is sequentially input to the first recording data storage area or the second recording data storage area. The recording data that has already been recorded is read from the first recording data storage area or the second recording data storage area that has not been subjected to the data recording process, and the addition data recording process is executed by the memory unit. A new addition is performed by reading the addition data already recorded from the first addition data storage area or the second addition data storage area which is not present, and adding the read recording data and the addition data. As the addition data, the first addition data storage area or the second addition data that is different from the read source of the addition data that has been read. Digital RF memory device, characterized in that to perform said addition data recording processing for recording in the data storage area in the memory unit.   The recording / addition control unit performs the addition process, and performs the recording data recording process by the memory unit in parallel during a series of operations for performing the addition data recording process by the memory unit. The digital RF memory device according to claim 1.   3. The recording / addition control unit ends the recording data recording process by the memory unit that has been executed in parallel at least when the series of operations ends. 2. A digital RF memory device according to 1.   The recording / addition control unit causes the memory unit to execute the recording data recording process and the addition data recording process until the end of the hopping cycle of the frequency hopping method. The digital RF memory device according to any one of the above.   5. The digital RF memory device according to claim 4, further comprising a reproduction control unit that reads and reproduces the addition data recorded in the memory unit by the addition data recording process performed last. A data table unit that holds a combination of the hopping rate and the number of hopping channels of the frequency hopping method as a table;
The recording / addition control unit determines a channel to be recorded as the recording data and a data length of the recording data from the hopping rate and the number of hopping channels. The digital RF memory device according to any one of the above. A playback control unit that reads and plays back the added data from the memory unit;
The data table unit further includes pulse width information of the RF signal in a table of combinations of the hopping rate and the number of hopping channels, and the reproduction control unit receives the added data from the pulse width information. 7. The digital RF memory device according to claim 6, wherein a pulse width for reproduction is determined.   The recording / addition control unit executes reception pulse synchronization for starting the recording data recording process in response to a trigger generated from information obtained by detecting the RF signal by a receiving unit that receives the RF signal. The digital RF memory device according to any one of claims 1 to 7.   The recording / addition control unit determines a portion having no information for each recording data from the trigger and the hopping rate, and rejects the portion without the information from the memory unit, or other than the portion without the information The digital RF memory device according to claim 8, wherein the digital RF memory device is recorded in the memory unit.   8. The subordinate to claim 7, wherein the reproduction control unit reads and reproduces a portion other than a portion having no information for each of the recording data obtained from the trigger and the hopping rate. A digital RF memory device according to claim 9. A recording method using a digital RF memory device that records an RF signal transmitted from a device using a frequency hopping method as recording data for each hopping channel,
A recording data recording processing step for alternately recording the recording data input sequentially into the first recording data storage area or the second recording data storage area, and the first recording data on which the recording data recording processing step is not executed A recording data reading step for reading the recording data already recorded from the storage area or the second recording data storage area, and a first addition data storage area or a second addition for which the addition data recording processing step has not been executed An addition data reading step for reading the already recorded addition data from the data storage area, and an addition process for adding the recording data and the addition data read in the recording data reading step and the addition data reading step As the additional data, the additional data reading step Recording method, comprising the said sum data recording processing step is to be recorded to a different person the first addition data storage region or the second addition data storage area of the read source of the added data read in.   12. The recording method according to claim 11, wherein the recording data recording processing step is executed in parallel with the recording data reading step, the addition data reading step, and the addition data recording processing step.   13. The recording method according to claim 12, wherein the additional data recording processing step is terminated at least when the recording data recording processing step that has been executed in parallel is completed.   A reproduction method comprising a reproduction step of reproducing the added data recorded by the recording method according to any one of claims 11 to 13.   15. The reproducing method according to claim 14, wherein the reproducing step determines a pulse width when reproducing the added data from information on a pulse width of the RF signal.

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