Multi-tone radar and transmission / reception method

Abstract

To increase the bandwidth of a radar and an EW device and restrain an increase in the scale of hardware.SOLUTION: A multi-tone radar 100 transmits a multi-tone signal as an interference signal for interfering with threat radar waves and a radar signal, and receives a multi-tone signal including a radar signal reflected from a target as an echo signal. The radar includes multiple divider circuits #1 to #n for transmitting multi-tone signals within multiple frequency ranges in which a transmission / reception frequency range of the multi-tone radar 100 is divided. The multiple divider circuits #1 to #n include a radar divider circuit for transmitting a multi-tone signal as a radar signal and an interference divider circuit for transmitting a multi-tone signal as an interference signal.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present disclosure relates to a multi-tone radar and a method for transmitting and receiving. [Background technology]

[0002] In recent years, radar and EW (Electronic Warfare) equipment are becoming wider bandwidth due to the performance improvement of digital components. Generally, radar and EW equipment are developed separately, so when radar and EW equipment are installed on an aircraft, for example, the scale of the hardware of the avionics as a whole becomes large, and a device to integrate them is also required.

[0003] For example, Patent Document 1 discloses a wideband radar device that includes a transmitter that transmits a wideband signal and a receiver that receives a reflected wave of the wideband signal transmitted from the transmitter, and detects a target based on the result of bandwidth synthesis of a plurality of subband signals having different frequency bands in the reflected wave received by the receiver, excluding subband signals that have interference. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-8452 A Summary of the Invention [Problem to be solved by the invention]

[0005] The wideband radar device disclosed in Patent Document 1 is a device intended to remove unwanted waves and does not have the function of transmitting jamming waves. Therefore, in order to use this wideband radar device to jam a wideband threat radar, another EW device that transmits jamming waves in a wideband and a device that integrates these are required, which increases the scale of the hardware.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to broaden the bandwidth of radar and EW devices while suppressing an increase in the scale of hardware. [Means for solving the problem]

[0007] In order to achieve the above object, a multi-tone radar according to the present disclosure is a multi-tone radar that transmits a multi-tone signal as a jamming signal and a radar signal that jams a threat radar wave, and receives a multi-tone signal including a radar signal reflected from a target as an echo signal. The multi-tone radar includes a plurality of division circuits. The plurality of division circuits transmit multi-tone signals in a plurality of frequency ranges obtained by dividing the transmission and reception frequency range of the multi-tone radar. The plurality of division circuits include a radar division circuit that transmits the multi-tone signal as a radar signal, and a jamming division circuit that transmits the multi-tone signal as a jamming signal. Effect of the Invention

[0008] According to the present disclosure, by providing a division circuit corresponding to multiple frequency ranges obtained by dividing the transmission and reception frequency range of a multi-tone radar, and the multiple division circuits including a division circuit for the radar and a division circuit for jamming, it is possible to make the radar and EW device broadband and suppress an increase in the size of the hardware. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a configuration example of a multi-tone radar according to a first embodiment; [Diagram 2] FIG. 1 is a diagram showing a frequency range of a wideband BPF according to the first embodiment; [Diagram 3] FIG. 1 is a diagram showing a frequency range of a narrow-band BPF according to the first embodiment; [Figure 4] FIG. 1 is a diagram illustrating hopping of a radar signal in a multi-tone radar according to a first embodiment. [Diagram 5] FIG. 1 is a diagram showing a configuration example of an integrated processing circuit according to a first embodiment; [Figure 6]FIG. 1 is a diagram showing an ECCM effect of a multi-tone radar according to a first embodiment. [Figure 7] Flowchart showing target detection processing according to the first embodiment [Figure 8] FIG. 13 is a diagram showing an image of radar waves and jamming waves of a multi-tone radar according to a second embodiment. [Figure 9] FIG. 13 is a diagram showing an example of allocation of multi-tone signals to interference signals according to the second embodiment; [Figure 10] FIG. 13 is a diagram showing a method of using a multi-tone radar according to a second embodiment and allocation of multi-tone signals. [Figure 11] FIG. 13 is a diagram showing a configuration example of a multi-tone radar according to a second embodiment, the usage of which is radar and power jamming. [Figure 12] FIG. 11 is a diagram showing a configuration example of an integrated processing circuit of a multi-tone radar in which the method of use is radar and power jamming according to the second embodiment. [Figure 13] FIG. 13 is a diagram showing a configuration example of a multi-tone radar according to a second embodiment, the usage of which is radar, power jamming, and deceptive jamming. [Figure 14] FIG. 11 is a diagram showing a configuration example of an integrated processing circuit of a multi-tone radar used for radar, power jamming, and deceptive jamming according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A multi-tone radar according to the present embodiment will be described in detail below with reference to the drawings. Note that the same or corresponding parts in the drawings are given the same reference numerals, and in principle, their description will not be repeated. A multi-tone radar is a radar that transmits a multi-tone signal as a radar signal, receives the multi-tone signal including the radar signal reflected from a target as an echo signal, and detects the target based on the echo signal. Here, a multi-tone signal refers to the simultaneous transmission of multiple signals. The opposite of a multi-tone signal is a multi-spot signal. A multi-spot signal refers to the instantaneous transmission of one wave.

[0011] (Embodiment 1) 1 shows an example of the configuration of a multi-tone radar 100 according to the first embodiment. In order to provide a transmission / reception band that is sufficiently wider than the transmission / reception bandwidth of the ECM device, the multi-tone radar 100 is configured by arranging a plurality of wideband RF (Radio Frequency) circuits to divide the transmission / reception frequency range. Hereinafter, among the wideband RF circuits obtained by dividing the frequency range of the multi-tone radar 100, the RF circuit of the transmission system is referred to as a divided circuit (transmission), and the RF circuit of the reception system is referred to as a divided circuit (reception). The divided circuit (transmission) and the divided circuit (reception) are collectively referred to simply as a divided circuit.

[0012] The multi-tone radar 100 transmits a multi-tone signal as a radar signal and receives a multi-tone signal including a radar signal reflected from a target as an echo signal. In order to achieve a high ECCM effect, the multi-tone radar 100 assigns one multi-tone signal to each divided circuit for transmission and reception, and extracts and adopts only target detection results that are not affected by threatening jamming waves from the target detection results that have been signal-processed for each divided circuit. In addition, the multi-tone radar 100 hops or agiles each multi-tone signal to improve the ECCM effect. In the figure, the straight arrows represent analog signals (RF signals / IF signals), and the dashed arrows represent digital signals (data).

[0013] First, the reception system of the multi-tone radar 100 will be described. An echo signal received by an aerial 11, which is an antenna, is amplified by an amplifier 13 via a transmission / reception switch 12. The amplified echo signal is limited to a set frequency band and band by a filter bank 14 that determines the transmission / reception band of the multi-tone radar 100, and is frequency-converted to a 1st IF (Intermediate Frequency) signal by a mixer 15 using a 1st Lo signal. The 1st IF signal output from the mixer 15 is distributed to division circuits (reception) #1 to #n by a distributor 16. In the figure, the division circuits (reception) #1 to #n are represented as #1 (reception) to #n (reception), respectively. n is the number of divisions, and the number of multi-tone signals. Hereinafter, each multi-tone signal is referred to as a multi-tone signal #1 to #n, and the division circuits corresponding to the multi-tone signals #1 to #n are referred to as division circuits #1 to #n. The 1st IF signal is an example of a first intermediate frequency signal.

[0014] After distribution, the 1st IF signal is band-limited by BPF (wide) 171 to 17n for each division circuit (reception). Hereinafter, the BPF (wide) 171 to 17n are collectively referred to as BPF (wide) 17. The band limited by BPF (wide) 17 is a wide bandwidth that defines the hopping range and agile range for each wave of the multi-tone signal.

[0015] The frequency range of the BPF (wide) 171 to 17n will be described with reference to FIG. 2. As shown in FIG. 2, the transmission and reception frequency range of the multi-tone radar 100 is divided into the frequency ranges of the BPF (wide) 171 to 17n corresponding to the divided circuits #1 to #n. The frequency ranges of the BPF (wide) 171 to 17n are the hopping range and agile range of the multi-tone signals #1 to #n, respectively, and do not overlap with the bands of the other divided circuits. Specifically, the frequency separation between adjacent BPF (wide) 17 is set to be 1.0 / τ [Hz] or more, where τ is the pulse width of the radar signal (echo signal). This prevents the influence of the spectrum spread at the band edge of the adjacent divided circuit. Note that the frequency separation may be made sufficiently large when the characteristics of the components constituting the set frequency separation result in the influence of the spectrum spread at the band edge of the adjacent divided circuit, or when interference with other communication devices is to be avoided.

[0016] As shown in Fig. 1, the 1st IF signal band-limited by the BPF (wide) 171-17n for each division circuit (reception) is frequency-converted to a 2nd IF signal by the mixers 181-18n using a 2nd Lo signal. The 2nd IF signal output from the mixers 181-18n is band-limited by the BPF (narrow) 191-19n that defines the instantaneous reception band of the radar. The 2nd IF signal is an example of a second intermediate frequency signal.

[0017] The frequency range of the BPF (narrow) 191-19n will be described with reference to Fig. 3. As shown in Fig. 3, the frequency range of the BPF (narrow) 191-19n corresponding to the division circuits #1-#n is a narrow band equivalent to the chirp width and matched filter. By controlling the 2nd Lo frequency for each division circuit, hopping and agile frequency change is possible within the range of the BPF (wide) 171-17n.

[0018] 1, the 2nd IF signals that have passed through the BPFs (narrow) 191-19n are AD converted by AD converters 201-20n and output to signal processing circuits 211-21n. Based on the AD converted signals, the signal processing circuits 211-21n perform signal processing for detecting targets, and target detection data #1-#n indicating target detection results are output to the integrated processing circuit 22. The processing performed by the integrated processing circuit 22 will be described later.

[0019] Next, the transmission system of the multi-tone radar 100 will be described. When the integrated processing circuit 22 outputs radar waveform data, the data is converted by the DA converter 23 and a 2nd IF signal is output. The radar waveform data is, for example, a chirp, a Barker code, FMCW (Frequency Modulated Continuous Wave), a pulse, etc. The 2nd IF signal output from the DA converter 23 is distributed to the division circuits (transmission) #1 to #n by the distributor 24. In the figure, the division circuits (transmission) #1 to #n are represented as #1 (transmission) to #n (transmission), respectively. The distributed 2nd IF signal is band-limited by the BPF (narrow) 251 to 25n. The BPF (narrow) 251 to 25n of the transmission system is the same as the BPF (narrow) 191 to 19n of the reception system.

[0020] The 2nd IF signals that have passed through the BPFs (narrow) 251-25n are frequency converted to 1st IF signals by the mixers 261-26n using the 2nd Lo signal, and are band-limited by the BPFs (wide) 271-27n. The BPFs (wide) 271-27n of the transmission system are the same as the BPFs (wide) 171-17n of the reception system. Hereinafter, the BPFs (wide) 271-27n will be collectively referred to as the BPF (wide) 27.

[0021] The 1st IF signals that have passed through the BPFs (wide) 271 to 27n are synthesized by a synthesizer 28 to become a multi-tone signal, and are frequency-converted to an RF signal by a mixer 29 using the 1st Lo signal. The RF signal is limited to a set frequency band and band by a filter bank 30 that determines the transmission and reception bands of the multi-tone radar 100, and then amplified by an amplifier 31. The amplified RF signal is transmitted as a radar signal from the antenna 11 via the transmission / reception switch 12. The filter bank 30 of the transmission system is the same as the filter bank 14 of the reception system. The transmission / reception switch 12 switches the antenna 11 between transmission and reception.

[0022] Here, the signal generating circuit will be described. The multi-tone radar 100 has and controls a first signal generating circuit 32 and second signal generating circuits 341 to 34n. n is the number of divisions, which is the number of multi-tone signals. The first signal generating circuit 32 is a circuit that generates a 1st Lo signal in the frequency conversion of the multi-tone radar 100. The 1st Lo signal generated by the first signal generating circuit 32 is distributed by a distributor 33 and input to the mixer 15 of the reception system and the mixer 29 of the transmission system. The 1st Lo signal generated by the first signal generating circuit 32 is a local signal common to each multi-tone signal (each division circuit), so that the tuning frequency is within the transmission and reception frequency range of the multi-tone radar 100. In other words, the transmission and reception frequency range of the multi-tone radar 100 is defined by the 1st Lo signal. The 1st Lo signal is an example of a first local signal. Also, the mixer 15 of the reception system and the mixer 29 of the transmission system are examples of mixers common to a plurality of division circuits.

[0023] The second signal generating circuits 341-34n are circuits that generate 2nd Lo signals #1-#n in the frequency conversion of the multi-tone radar 100. The 2nd Lo signals #1-#n generated by the second signal generating circuits 341-34n are distributed by distributors 351-35n, respectively, and input to the mixers 181-18n of the reception system and the mixers 261-26n of the transmission system. The 2nd Lo signals #1-#n generated by the second signal generating circuits 341-34n are individual local signals of each multi-tone signal (each dividing circuit), so that the 2nd Lo signals #1-#n specify which frequency range the corresponding dividing circuit corresponds to among the frequency ranges obtained by dividing the transmission and reception frequency range of the multi-tone radar 100. The 2nd Lo signals are an example of second local signals. Moreover, the mixers 181 to 18n in the reception system and the mixers 261 to 26n in the transmission system are examples of individual mixers for each of the multiple division circuits.

[0024] In this embodiment, the 2nd Lo frequency is individually controlled for each divided circuit, and a frequency range obtained by dividing the transmission / reception frequency range of the multi-tone radar 100 is assigned to each divided circuit, and the 2nd IF frequencies of all divided circuits are set to the same frequency range. This allows the AD converters 201 to 20n and the DA converter 23 to have the same performance for each divided circuit, and there is no need to increase the sampling frequency. Therefore, a wide band can be achieved using conventional components.

[0025] Here, the hopping and agility of the multi-tone signal performed by the multi-tone radar 100 will be described. It is possible to make each multi-tone signal hopping or agile by varying the 1st Lo signal generated by the first signal generating circuit 32. By being able to set hopping or agile for the multi-tone signal, it becomes less susceptible to the influence of threatening jamming waves, and a high ECCM effect can be obtained. However, since the 1st Lo signal generated by the first signal generating circuit 32 is a local signal common to each multi-tone signal, the frequency fluctuation due to hopping and agility of each multi-tone signal is the same.

[0026] On the other hand, it is also possible to hop or make each multi-tone signal agile by varying the 2nd Lo signals #1 to #n generated by the second signal generating circuits 341 to 34n. In this case, compared to using the 1st Lo signal generated by the first signal generating circuit 32 for hopping and agile, since frequency variation control is possible for each multi-tone signal individually, it is more effective from the viewpoint of improving ECCM performance to vary the 2nd Lo signals #1 to #n generated by the second signal generating circuits 341 to 34n to perform hopping and agile. Therefore, in this embodiment, the multi-tone radar 100 varies the 2nd Lo signals #1 to #n to perform hopping and agile.

[0027] Hopping and agile when varying 2nd Lo signals #1 to #n will be described in detail with reference to Fig. 4. In the example of Fig. 4, the 2nd Lo signals #1 to #n generated by the second signal generating circuits 341 to 34n are varied to hop the multi-tone signals f1 to fn individually. In the example of Fig. 4, the frequency of the multi-tone signals f1 to fn is varied at intervals of multiple pulses, but in the case of agile, the frequency is changed for each pulse. By setting hopping or agile individually for the multi-tone signals, the signal becomes less susceptible to the effects of threatening jamming waves, and a high ECCM effect can be obtained.

[0028] As shown in FIG. 1, when n multi-tone signals are transmitted as radar signals from the antenna 11 and reflected by a target, the n multi-tone signals are received by the antenna 11 as echo signals. The echo signals are distributed to the division circuits (reception) #1 to #n by the distributor 16 for each wave of the multi-tone signals, and are processed by the signal processing circuits 211 to 21n, and the targets are detected. When the antenna 11 receives a threat jamming wave together with the echo signal, the signal processing circuits 211 to 21n detect that jamming has occurred, that is, jamming. When the signal processing result is "target detected and jamming not detected," each of the signal processing circuits 211 to 21n outputs the target detection data to the integrated processing circuit 22, and when the signal processing result is "target not detected" or "target detected and jamming detected," the target detection data is rejected. In other words, the target detection data output to the integrated processing circuit 22 is always target detection data in which a target is detected and jamming is not detected.

[0029] Here, a configuration example of the integrated processing circuit 22 will be described with reference to Fig. 5. The integrated processing circuit 22 includes a target detection data selection unit 221 that selects at least one target detection data from among the target detection data #1 to #n output from the signal processing circuits 211 to 21n, a correlation determination unit 222 that performs correlation determination processing for each selected target detection data and adopts target detection data that satisfies a predetermined correlation condition, a target detection data output unit 223 that outputs the adopted target detection data, and a storage unit 232 that stores information data. In the correlation determination processing executed by the correlation determination unit 222, a correlation determination is performed with past target detection data for each selected target detection data, and the target detection data is rejected if it does not satisfy a correlation condition consisting of at least one of the target's direction, distance, speed, and traveling direction, and is adopted if it satisfies the correlation condition. For example, the correlation determination unit 222 determines at least one of the target's direction, distance, speed, and traveling direction, etc., from the correlation with past target detection data, and sets the correlation condition as being that the difference from at least one of the previously determined direction, distance, speed, and traveling direction, etc., is within a predetermined threshold. The storage unit 232 is a semiconductor memory, a flash memory, a magnetic disk, etc., and stores information data required for performing the correlation determination process. For example, the target detection data is stored in the storage unit 232. The target detection data may be stored in advance, or target detection data input to the integrated processing circuit 22 at any time may be stored.

[0030] The correlation determination unit 222 may, for example, adopt the target detection data that satisfies the correlation condition first among a plurality of target detection data sequentially input to the correlation determination unit 222, or may adopt the target detection data randomly from among the target detection data that satisfy the correlation condition. The target detection data may be output, for example, by displaying it on a screen, or by outputting it to an external device or system. The integrated processing circuit 22 also includes a radar waveform data generation unit 224 that generates the above-mentioned radar waveform data. The radar waveform data generation unit 224 outputs the generated radar waveform data to the DA converter 23.

[0031] Here, the jamming detection will be specifically described. For example, the antenna 11 may receive power jamming as jamming. When the antenna 11 receives high-power jamming due to continuous waves, noise waves, sweep waves, etc., it enters a state in which it cannot detect a multi-tone signal reflected from a target even though it receives some signal. That is, the signal processing circuits 211 to 21n determine that jamming has been detected when the strength of the received signal exceeds a threshold and the multi-tone signal reflected from the target cannot be detected. Also, for example, the antenna 11 may receive deceptive jamming as jamming. The antenna 11 receives a multi-tone signal of a plurality of false targets in addition to the multi-tone signal reflected from the target. The signal processing circuits 211 to 21n determine that jamming has been detected when the number of detections of echo signals, which are multi-tone signals, increases. Also, the direction, distance, speed, and traveling direction of the false target multi-tone signal may change with each reception. The correlation determination unit 222 rejects target detection data that changes with each reception and does not satisfy the correlation condition, and determines that it is deceptive jamming. Also, for example, the antenna 11 may receive a jamming signal that coincides with a multi-tone signal reflected from a target. Since the correlation determination unit 222 determines the correlation condition for each target detection data of the selected split circuit, if the multi-tone signal reflected from the target coincides with the jamming signal, it is difficult to detect the target detection data as jamming. Therefore, the correlation determination unit 222 performs a correlation determination as to whether or not the correlation condition is satisfied for each target detection data of the selected split circuit, and whether or not the correlation condition with the target detection data of another selected split circuit is satisfied. The correlation determination unit 222 compares the target detection data of multiple split circuits and performs a correlation determination, so that the jamming signal can be detected even when the multi-tone signal coincides with the jamming signal.

[0032] As described above, the multi-tone radar 100 performs target detection using a multi-tone signal that is not affected by threat jamming waves, and achieves a high ECCM effect. The ECCM effect of the multi-tone radar will be described with reference to FIG. 6. As shown in FIG. 6, the output frequency range of the multi-tones of the multi-tone radar 100 is sufficiently wider than the instantaneous transmission band of the threat jamming waves by the ECM device. Therefore, even if the ECM device jams the radar signal by frequency tracking, at least one of the multi-tones f1 to fn is always unaffected by the jamming. In the example of FIG. 6, the ECM device frequency tracks the radar signal, and the state shifts from the state where the multi-tones f2 and f3 are affected by the jamming to the state where the multi-tones fn-1 and fn are affected by the jamming, but there are always multi-tones that are not affected by the jamming. The multi-tone radar 100 performs target detection for each multi-tone signal, and adopts target detection data obtained by signal processing of the multi-tone signal that is not affected by the jamming, so that it can continue stable target detection even when the jamming frequency changes quickly by tracking the radar frequency.

[0033] Next, the flow of the target detection process executed by the multi-tone radar 100 will be described with reference to FIG. 7. The target detection process starts when the multi-tone radar 100 is activated. The DA converter 23 performs DA conversion on the radar waveform data output from the integrated processing circuit 22 to generate a 2nd IF signal (step S11), and the 2nd IF signal is distributed to the division circuits (transmission) #1 to #n by the distributor 24. The division circuit (transmission) #1 frequency-converts the distributed 2nd IF signal and transmits the radar signal #1 from the antenna 11 (step S12-1). The division circuit (reception) #1 receives the echo signal #1, which is the radar signal #1 reflected from the target, from the antenna 11 (step S13-1). The signal processing circuit 211 frequency-converts the echo signal #1 and executes signal processing based on the AD-converted digital signal (step S14-1), and generates target detection data #1 indicating the target detection result. If the signal processing circuit 211 detects interference as a result of signal processing (step S15-1; YES), it rejects the target detection data #1 (step S16-1). If it does not detect interference (step S15-1; NO), it determines whether or not a target has been detected (step S17-1). If it does not detect a target (step S17-1; NO), it rejects the target detection data #1 (step S16-1). If it detects a target (step S17-1; YES), it outputs the target detection data #1 to the integrated processing circuit 22 (step S18-1).

[0034] The division circuit (transmission) #2 frequency-converts the distributed 2nd IF signal and transmits the radar signal #2 from the antenna 11 (step S12-2). The division circuit (reception) #2 receives the echo signal #2, which is the radar signal #2 reflected from the target, from the antenna 11 (step S13-2). The signal processing circuit 212 frequency-converts the echo signal #2, executes signal processing based on the AD-converted digital signal (step S14-2), and generates target detection data #2 indicating the target detection result. If the signal processing circuit 211 detects interference as a result of the signal processing (step S15-2; YES), it rejects the target detection data #2 (step S16-2). If it does not detect interference (step S15-2; NO), it determines whether or not a target has been detected (step S17-2). If it does not detect a target (step S17-2; NO), it rejects the target detection data #2 (step S16-2). If a target is detected (step S17-2; YES), target detection data #2 is output to the integrated processing circuit 22 (step S18-2).

[0035] The division circuit (transmission) #n converts the frequency of the distributed 2nd IF signal and transmits the radar signal #n from the antenna 11 (step S12-n). The division circuit (reception) #n receives the echo signal #n, which is the radar signal #n reflected from the target, from the antenna 11 (step S13-n). The signal processing circuit 211 converts the frequency of the echo signal #n, executes signal processing based on the AD-converted digital signal (step S14-n), and generates target detection data #n indicating the target detection result. If the signal processing circuit 211 detects interference as a result of the signal processing (step S15-n; YES), it rejects the target detection data #n (step S16-n). If it does not detect interference (step S15-n; NO), it determines whether or not a target has been detected (step S17-n). If it does not detect a target (step S17-n; NO), it rejects the target detection data #n (step S16-n). If a target is detected (step S17-n; YES), the target detection data #n is output to the integrated processing circuit 22 (step S18-n). The division circuits (transmission) #3 to #n-1 also perform the same process.

[0036] The target detection data selection unit 221 of the integrated processing circuit 22 selects at least one target detection data from among the target detection data #1 to #n output from the signal processing circuits 211 to 21n (step S19). The correlation determination unit 222 performs correlation determination for each selected target detection data to determine whether the correlation condition is satisfied and whether the correlation condition with the target detection data of the selected other divided circuits is satisfied (step S20). If the correlation condition is not satisfied (step S20; NO), the correlation determination unit 222 discards the target detection data (step S21). If the correlation condition is satisfied (step S20; YES), the correlation determination unit 222 adopts the target detection data (step S22). The target detection data output unit 223 outputs the adopted target detection data (step S23) and ends the process.

[0037] As described above, according to the first embodiment, the split circuits corresponding to the multiple frequency ranges obtained by dividing the transmission and reception frequency range of the multi-tone radar are provided, the radar signal is hopped or agile within the frequency range of the split circuits, a target and interference are detected based on the echo signal for each split circuit to generate target detection data, and the target detection data of a split circuit in which a target is detected and interference is not detected is selected, thereby widening the bandwidth and realizing stable target detection even when the interference frequency changes quickly following the radar frequency. Also, by making the configuration before the distributor 16 in the receiving system and the configuration after the combiner 28 in the transmitting system common to each split circuit, an increase in the circuit scale due to the widening can be suppressed.

[0038] (Embodiment 2) In the first embodiment, the multi-tone radar 100 is used only for "radar", but in the second embodiment, it is used for "radar + jamming". In addition to the configuration of the first embodiment, the multi-tone radar 100 of the second embodiment receives notification of the detection result of a threat radar wave from an ESM (Electronic Support. Measures) device, an RWR (Radar Warning Receiver) device, etc. mounted on its own platform, and assigns one or more waves of the multi-tone signals used as radar signals to jamming signals for the threat radar. The detection result of the threat radar wave includes the frequency of the threat radar wave.

[0039] An example of an aircraft equipped with a multi-tone radar 100 having a "radar + jamming" configuration in which one or more arbitrary multi-tone signals among the multi-tone signals are assigned as jamming signals to a threat radar will be described with reference to Figs. 8 and 9.

[0040] In the example of Fig. 8, the multi-tone radar 100 installed in the user aircraft assigns one wave of the multi-tone signal used as a radar signal to a jamming signal. When the ESM or RWR installed in the user aircraft detects a threat radar wave and notifies the multi-tone radar 100 of the detection result, the multi-tone radar 100 sets tuning to the threat radar wave and a jamming technique for a multi-tone signal in a frequency range including the frequency of the threat radar wave, and transmits the multi-tone signal. The jamming technique that can be used when assigning a jamming signal to a multi-tone signal is so-called power jamming, which increases the noise power of the radar receiver of the threat aircraft and deteriorates the signal-to-noise (SN) ratio.

[0041] In the example of Fig. 9, since the frequency of the threat radar wave included in the detection result of the threat radar wave is included in the frequency range of the multi-tone signal f2, the multi-tone signal f2 is assigned to the jamming signal, and a self-jamming wave that counters the threat radar wave is transmitted. Note that even if one or more waves of the multi-tone signal are simply tuned to the frequency of the threat radar wave without setting a jamming technique, it may be possible to obtain the effect of jamming that causes the threat radar to erroneously detect the position of our aircraft, that is, so-called deceptive jamming.

[0042] When one or more waves of the multi-tone signals used as radar signals are assigned to jamming signals, the 2nd Lo signal of the split circuit assigned to the jamming signal is superimposed on the jamming wave with a local signal as a signal for a power jamming technique such as noise or sweep, or the radar waveform data is switched to jamming waveform data. In the case of such a jamming signal generation method, the jamming function of the multi-tone radar 100 is basically limited to power jamming, but by adding a split circuit dedicated to jamming, it is possible to perform not only power jamming but also deceptive jamming.

[0043] FIG. 10 shows the usage of the multi-tone radar 100 and the allocation of the multi-tone signals. As shown in FIG. 10, when the usage of the multi-tone radar 100 is only "radar", the number of radar signals a is n waves, the number of power jamming signals b is 0 waves, and the number of deceptive jamming signals c is 0 waves. When the usage of the multi-tone radar 100 is "radar + power jamming", the number of radar signals a is 1 to n-1 waves, the number of power jamming signals b is n-1 to 1 waves, and the number of deceptive jamming signals c is 0 waves. In this case, since the number of multi-tone signals n is allocated to radar and power jamming, the relationship between the number of multi-tone signals n, the number of radar signals a, and the number of power jamming signals b is n=a+b. When the usage of the multi-tone radar 100 is "radar + deceptive jamming", the number of radar signals a is n waves, the number of power jamming signals b is 0 waves, and the number of deceptive jamming signals c is set arbitrarily to 1 wave or more. In this case, it is necessary to add independent division circuits for the number of deceptive jamming signals. When the usage of the multi-tone radar 100 is "radar + power jamming + deceptive jamming", the radar signal number a is 1 to n-1 waves, the power jamming signal number b is n-1 to 1 waves, and the deceptive jamming signal number c is set arbitrarily to 1 wave or more. In this case, in order to allocate the multi-tone signal number n to the radar and the power jamming, the relationship between the multi-tone signal number n, the radar signal number a, and the power jamming signal number b is n=a+b. In addition, it is necessary to add independent division circuits for the number of deceptive jamming signals. When the usage of the multi-tone radar 100 is only "jamming", the radar signal number a is 0 waves, the power jamming signal number b is n waves, and the deceptive jamming signal number c is set arbitrarily to 1 wave or more. In this case, it is necessary to add independent division circuits for the number of deceptive jamming signals.

[0044] Here, the configuration of the multi-tone radar 100 whose usage method is "radar + power jamming" will be described with reference to FIG. 11. In the following description, the jamming signal used for power jamming is referred to as the power jamming signal. In FIG. 11, the configuration before the distributor 16 in the receiving system and the configuration after the combiner 28 in the transmitting system are the same as those in the first embodiment, so they will be omitted. The integrated processing circuit 22 of the multi-tone radar 100 switches the division circuit (transmission) from radar use to jamming and from jamming to radar use based on the detection result notified from the ESM or RWR. The integrated processing circuit 22 generates waveform data for radar and waveform data for jamming, and outputs the radar waveform data to the division circuit (transmission) switched to radar use, and outputs the jamming waveform data to the division circuit (transmission) switched to jamming use.

[0045] In addition to the BPF (narrow) 251-25n, the mixers 261-26n, and the BPF (wide) 271-27n, the division circuits (transmission) #1-#n are respectively provided with DA converters 361-36n for DA-converting the waveform data output from the integrated processing circuit 22, ATTs (Attenuators) 371-37n for amplitude-modulating the 2nd IF signal for interference obtained by DA-converting the waveform data for interference according to the control signal output from the integrated processing circuit 22, and switches 381-38n for pulse-modulating the 2nd IF signal for interference that has been amplitude-modulated according to the control signal output from the integrated processing circuit 22. Here, n is the number of divisions, and the number of multi-tone signals. Also, the signal generating second circuits 341-34n generate 2nd Lo signals #1-#n according to the input control signal, and input them to the mixers of the corresponding division circuits (transmission). In the second signal generating circuits 341 to 34n, the 2nd Lo signal input to the mixer of the division circuit (transmission) assigned for interference is, for example, noise or sweep, and the 2nd Lo signal input to the mixer of the division circuit (transmission) used for radar is, for example, CW (Continuous Wave).

[0046] Next, a configuration example of the integrated processing circuit 22 will be described with reference to Fig. 12. The integrated processing circuit 22 includes a target detection data selection unit 221, a correlation determination unit 222, a target detection data output unit 223, a radar waveform data generation unit 224, and a detection result acquisition unit 225 that acquires a detection result notified from an ESM or RWR. The integrated processing circuit 22 also includes switching units 2261-226n that switch the divided circuits to radar or jamming, respectively corresponding to the divided circuits #1-#n, jamming waveform data generation units 2271-227n that generate jamming waveform data, amplitude modulation units 2281-228n that transmit control signals to the ATTs 371-37n, pulse modulation units 2291-229n that transmit control signals to the switches 381-38n, and 2nd Lo signal control units 2311-231n that output control signals to the signal generation second circuits 341-34n.

[0047] The integrated processing circuit 22 assigns some or all of the multiple divided circuits to the divided circuits for radar or the divided circuits for jamming power jamming. The detection result acquisition unit 225 assigns a multi-tone signal in a frequency range including the frequency of the threat radar wave included in the detection result notified from the ESM or RWR to the power jamming signal, and outputs an instruction signal to the switching unit of the corresponding divided circuit to instruct switching from radar to jamming. When the switching units 2261 to 226n receive an instruction signal from the detection result acquisition unit 225 to instruct switching from radar to jamming, they switch the corresponding divided circuit from radar to jamming. The radar waveform data generation unit 224 distributes the generated waveform data for radar to the switching units 2261 to 226n. The jamming waveform data generation units 2271 to 227n generate jamming waveform data, respectively, and send them to the switching units 2261 to 226n. The jamming waveform data is, for example, noise, sweep, or the like. When switching the corresponding split circuit to interference use, each of the switching units 2261 to 226n outputs waveform data for interference to the corresponding DA converter 361 to 36n, and when switching to radar use, each of the switching units 2261 to 226n outputs waveform data for radar to the corresponding DA converter 361 to 36n.

[0048] The amplitude modulation units 2281-228n output control signals to the ATTs 371-37n, respectively, when the division circuit (transmission) is switched to jamming, and perform amplitude modulation. The pulse modulation units 2291-229n output control signals to the switches 381-38n, respectively, when the division circuit (transmission) is switched to jamming, and perform pulse modulation. When the division circuit (transmission) is used for radar, amplitude modulation and pulse modulation are not performed. The 2nd Lo signal control units 2311-231n output control signals for setting noise, sweep, etc., to the signal generation second circuits 341-34n when the division circuit (transmission) is switched to jamming and jamming waves are superimposed on the 2nd Lo signal.

[0049] 11 and 12, the case where the multi-tone signal is used as a radar signal and the case where the multi-tone signal is assigned to a power jamming signal will be described using the division circuit (transmission) #1. When the multi-tone signal of the division circuit (reception) #1 is used as a radar signal, the switching unit 2261 outputs the radar waveform data generated and distributed by the radar waveform data generating unit 224 to the DA converter 361. The radar waveform data output from the switching unit 2261 is DA converted by the DA converter 361, and a 2nd IF signal for radar is output. The 2nd IF signal for radar is band-limited by the BPF (narrow) 251 via the ATT 371 and the switch 381. At this time, the ATT 371 and the switch 381 do not perform amplitude modulation and pulse modulation, respectively.

[0050] The 2nd IF signal for radar that has passed through the BPF (narrow) is frequency converted by the mixer 261 using the 2nd Lo signal #1 to a 1st IF signal for radar, and is band-limited by the BPF (wide) 271. The 1st IF signal for radar that has passed through the BPF (wide) 271 is combined with the 1st IF signals of the division circuits (transmission) #2 to #n by the combiner 28 to become a multi-tone signal.

[0051] When the multi-tone signal of the division circuit (transmission) #1 is assigned to a power jamming signal, the detection result acquisition unit 225 instructs the switching unit 2261 of the division circuit (transmission) #1 to switch from radar to jamming. When the switching unit 2261 is instructed by the detection result acquisition unit 225 to switch from radar to jamming, the switching unit 2261 outputs the jamming waveform data generated by the jamming waveform data generation unit 2271 to the DA converter 361.

[0052] The DA converter 361 performs DA conversion on the jamming waveform data output from the switching unit 2261, and outputs a jamming 2nd IF signal. The ATT 371 performs amplitude modulation on the jamming 2nd IF signal output from the DA converter 361 in accordance with a control signal from the amplitude modulation unit 2281. The switch 381 performs pulse modulation on the amplitude-modulated jamming 2nd IF signal in accordance with a control signal from the pulse modulation unit 2291, and outputs the pulse-modulated jamming 2nd IF signal to the BPF (narrow) 251. The pulse-modulated jamming 2nd IF signal is band-limited by the BPF (narrow) 251. The jamming 2nd IF signal that has passed through the BPF (narrow) is frequency-converted by the mixer 261 to a jamming 1st IF signal, and is band-limited by the BPF (wide) 271. The 1st IF signal for interference that has passed through the BPFs (wide) 271-27n is combined with the 1st IF signals of the division circuits (transmission) #2-#n by the combiner 28 to become a multi-tone signal. When an interference wave is superimposed on the 2nd Lo signal, the 2nd Lo signal control section 2311 can widen the band of the 1st IF signal for interference output from the mixer 261 by outputting a control signal for setting noise, sweep, etc. to the second signal generating circuit 341.

[0053] Although the configuration after the combiner 28 is omitted, the multi-tone signal is up-converted by the 1stLo signal by the mixer 29 and frequency-converted to an RF signal. The RF signal is limited to a set frequency band and band width by the filter bank 30, amplified by the amplifier 31, and transmitted from the antenna 11 via the duplexer 12 as a power jamming signal and a radar signal.

[0054] When the frequency of the threat radar wave fluctuates and is no longer included in the frequency range of the multi-tone signal of the division circuit (transmission) #1, the detection result acquisition unit 225 instructs the switching unit 2261 of the division circuit (transmission) #1 to switch from jamming to radar. When the switching unit 2261 is instructed by the detection result acquisition unit 225 to switch from jamming to radar, it outputs the radar waveform data generated and distributed by the radar waveform data generation unit 224 to the DA converter 361.

[0055] Next, the configuration of multi-tone radar 100 whose usage method is "radar + power jamming + deceptive jamming" will be described with reference to Fig. 13. In Fig. 13, the configuration before distributor 16 in the receiving system and the configuration after combiner 28 in the transmitting system are the same as those in embodiment 1, so they will be omitted. In addition to splitting circuits #1 to #n, multi-tone radar 100 has splitting circuit #x for jamming. In the figure, splitting circuit (receiving) #x and splitting circuit (transmitting) #x are denoted as #x(receiving) and #x(transmitting), respectively.

[0056] Since power jamming has been described with reference to Figs. 11 and 12, the split circuit #x used for deception jamming will be described here. In the following description, a jamming signal used for deception jamming is called a deception jamming signal. The split circuit (receiving) #x receives a threat radar wave. Although the configuration before the distributor 16 is omitted, the threat radar wave received by the antenna 11 is amplified by the amplifier 13 via the transmission / reception switch 12 together with an echo signal. The amplified threat radar wave and echo signal are limited to a set frequency band and band by the filter bank 14, and are frequency-converted to a 1st IF signal by the mixer 15 using a 1st Lo signal. The 1st IF signal output from the mixer 15 is distributed to the split circuits (receiving) #1 to #n and the split circuit (receiving) #x by the distributor 16. At this time, the 1st IF signal of the threat radar wave is distributed to the split circuit (receiving) #x according to the detection result of the threat radar wave.

[0057] The division circuit (reception) #x includes a mixer 18x that is the same as the mixers 181 to 18n. The 1st IF signal of the threat radar wave is frequency-converted by the mixer 18x to a 2nd IF signal of the threat radar wave using a 2nd Lo signal #x generated by the second signal generating circuit 34x.

[0058] The division circuit (reception) #x includes, in addition to the mixer 18x, a BPF (wide) 39x that limits the band of the 2nd IF signal of the threat radar wave output from the mixer 18x. In order to make the jamming band of the deception jamming as wide as possible, the band limited by the BPF (wide) 39x is set to a band equivalent to the hopping range and the agile range, similar to the BPFs (wide) 171 to 17n. The 2nd IF signal of the threat radar wave that has passed through the BPF (wide) 39x is input to the integrated processing circuit 22. The waveform of the 2nd IF signal of the threat radar wave input to the integrated processing circuit 22 is temporarily stored, and the 2nd IF signal of the temporarily stored waveform is output from the integrated processing circuit 22.

[0059] The division circuit (transmission) #x includes a mixer 26x that is the same as the mixers 261-26n, a DA converter 36x that is the same as the DA converters 361-36n, an ATT 37x that is the same as the ATTs 371-37n, and a switch 38x that is the same as the switches 381-38n. The DA converter 36x performs DA conversion on the interference waveform data output from the integrated processing circuit 22, and generates and outputs an interference 2nd IF signal. The ATT 37x performs amplitude modulation on the interference 2nd IF signal output from the DA converter 36x in accordance with a control signal from the integrated processing circuit 22. The switch 38x performs pulse modulation on the amplitude-modulated interference 2nd IF signal in accordance with a control signal from the integrated processing circuit 22.

[0060] The division circuit (transmission) #x includes a mixer 26x, a DA converter 36x, an ATT 37x, and a switch 38x, as well as a combiner 40x that combines a 2nd IF signal of a waveform of a threat radar wave output from the integrated processing circuit 22 with a pulse-modulated 2nd IF signal for jamming to output a 2nd IF signal for deception jamming, and a BPF (wide) 41x that limits the band of the 2nd IF signal for deception jamming output from the combiner 40x. The BPF (wide) 41x is the same as the BPF (wide) 39x. The 2nd IF signal for deception jamming that has passed through the BPF (wide) 41x is frequency-converted by the mixer 26x into a 1st IF signal for deception jamming. The 1st IF signal for deception jamming is combined with the 1st IF signals of the division circuits (transmission) #1 to #n by the combiner 28 to become a multi-tone signal.

[0061] Although the configuration after the combiner 28 is omitted, the multi-tone signal is up-converted by the mixer 29 with the 1stLo signal and frequency-converted to an RF signal. The RF signal is limited to a frequency band and band set by the filter bank 30, amplified by the amplifier 31, and transmitted as a deception jamming signal and a radar signal from the antenna 11 via the transmission / reception switch 12. When at least one of the division circuits #1 to #n is assigned to power jamming, the signal is transmitted as a deception jamming signal, a power jamming signal, and a radar signal.

[0062] Next, a configuration example of the integrated processing circuit 22 will be described with reference to Fig. 14. The integrated processing circuit 22 includes a target detection data selection unit 221, a correlation determination unit 222, a target detection data output unit 223, a radar waveform data generation unit 224, a detection result acquisition unit 225, switching units 2261-226n, interference waveform data generation units 2271-227n, amplitude modulation units 2281-228n, pulse modulation units 2291-229n, and 2nd Lo signal control units 2311-231n that output control signals to the signal generation second circuits 341-34n, as well as an interference waveform data generation unit 227x that generates interference waveform data corresponding to the division circuit #x, an amplitude modulation unit 228x that transmits a control signal to the ATT 37x, a pulse modulation unit 229x that transmits a control signal to the switch 38x, and a 2nd Lo signal control unit 231x that outputs a control signal to the signal generation second circuit 34x. The integrated processing circuit 22 also includes a digital radio frequency memory (DRFM) 230 that temporarily stores the waveform of the 2nd IF signal of the input threat radar wave and outputs the 2nd IF signal of the stored waveform at a set delay time. The DRFM 230 AD converts the waveform of the 2nd IF signal of the input threat radar wave, temporarily stores the digital data in memory, and after the set delay time has elapsed, DA converts the stored digital data and outputs the 2nd IF signal of the threat radar wave waveform.

[0063] The 2nd IF signal for jamming transmitted from the antenna 11 is received by the radar of the threat aircraft with a time delay from the actual echo wave of the threat radar wave. The 2nd IF signal for deception jamming, which is a combination of the same waveform as the 2nd IF signal of the threat radar wave stored in the DRFM 230 and the 2nd IF signal for jamming, is frequency-converted and transmitted from the antenna 11 as a deception jamming signal, causing the radar of the threat aircraft to mistakenly recognize that our aircraft is at a different distance than it actually is.

[0064] In this embodiment, the 2nd Lo signals #1-#n generated by the second signal generating circuits 341-34n used for the radar signals are varied to make the radar signals hop or agile, but the frequency of the 2nd Lo signal #x generated by the second signal generating circuit 34x used for the jamming signal is not varied to prevent the jamming signal from hopping or agile. Note that if the threat radar wave is hopping or agile, the 2nd Lo signal #x may be varied in accordance with the variation in frequency of the threat radar wave.

[0065] The configuration of the multi-tone radar 100 whose usage method is "radar + deceptive jamming" is, for example, a configuration in which the components of the second signal generating circuit 34x, distributor 35x, and division circuit #x shown in Fig. 13 are added to the configuration shown in Fig. 1, and the configuration of the integrated processing circuit 22 is a configuration in which the components of the jamming waveform data generating unit 227x, amplitude modulation unit 228x, pulse modulation unit 229x, DRFM 230, and 2nd Lo signal control unit 231x shown in Fig. 14 are added to the configuration shown in Fig. 5. The division circuit #x is a division circuit for deceptive jamming, and the division circuits #1 to #n are division circuits for radar.

[0066] The configuration of the multi-tone radar 100 whose usage is only "jamming" is the same as that shown in Fig. 13, for example, and the configuration of the integrated processing circuit 22 is the same as that shown in Fig. 14 except that the target detection data selection unit 221, the correlation determination unit 222, the target detection data output unit 223, the radar waveform data generation unit 224, the detection result acquisition unit 225, and the switching units 2261-226n are removed. The jamming waveform data generation units 2271-227n may generate jamming waveform data and output the data to the corresponding DA converters 361-36n, or one jamming waveform data generation unit may distribute the jamming waveform data to the corresponding DA converters 361-36n. The division circuit #x is a division circuit for deception jamming, and the division circuits #1-#n are division circuits for power jamming.

[0067] As described above, according to the second embodiment, a part or all of the multi-tone signal of the multi-tone radar can be used as a jamming signal for a threat radar wave. The multi-tone radar 100 according to the second embodiment includes division circuits corresponding to a plurality of frequency ranges obtained by dividing the transmission and reception frequency range of the multi-tone radar, and the plurality of division circuits include a division circuit for the radar and a division circuit for jamming, thereby making it possible to broaden the bandwidth of the radar and EW device and to suppress an increase in the scale of the hardware.

[0068] In addition, in general, EW devices have a problem that there are time periods during which jamming signals are not transmitted, such as by stopping transmission of jamming signals while transmitting radar signals, or by switching jamming frequencies for multiple threat radars by time control, which reduces the jamming effect. In contrast, the multi-tone radar 100 according to the second embodiment can transmit radar signals and jamming signals simultaneously because the frequencies of the wideband multi-tone radar signals are sufficiently apart, and by increasing the number of jamming signals assigned, it is possible to realize simultaneous jamming of multiple threat radars. This makes it possible to prevent a reduction in the jamming effect due to time control.

[0069] In the above-mentioned first and second embodiments, the correlation determination unit 222 of the integrated processing circuit 22 performs a correlation determination with past target detection data for each selected target detection data, discards the target detection data if it does not satisfy a correlation condition consisting of at least one of the target's direction, distance, speed, and traveling direction, and adopts the target detection data if it satisfies the correlation condition, and the target detection data output unit 223 outputs the target detection data adopted by the correlation determination unit 222, but this is not limited to the above. The target detection data output unit 223 may output the target detection data selected by the target detection data selection unit 221. In this case, the integrated processing circuit 22 does not need to include the correlation determination unit 222.

[0070] In the above-mentioned first and second embodiments, the multi-tone radar 100 transmits and receives a multi-tone signal by operating all of the multiple division circuits, but this is not limited thereto. The number of division circuits to be operated among the multiple division circuits can be set. For example, one of the multiple division circuits may be operated to transmit and receive a single wave, or any two or more of the multiple division circuits may be operated to transmit and receive a multi-tone signal. In addition, by switching the number of division circuits to be operated among the multiple division circuits, it may be possible to switch between one-wave transmission and reception and multi-tone transmission and reception.

[0071] In the above-mentioned first and second embodiments, the multi-tone radar 100 detects interference in order to avoid the influence of radar interference caused by the ECM device, but this is not limited thereto. For example, clutter may be detected as interference in order to remove the influence of natural physical phenomena such as clutter.

[0072] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0073] Various aspects of the present disclosure are summarized below as appendices.

[0074] (Appendix 1) A multi-tone radar that transmits a multi-tone signal as a jamming signal that jams a threat radar wave and a radar signal, and receives the multi-tone signal including the radar signal reflected from a target as an echo signal, a plurality of division circuits for transmitting the multi-tone signal in a plurality of frequency ranges obtained by dividing a transmission / reception frequency range of the multi-tone radar, the plurality of division circuits include a radar division circuit that transmits the multi-tone signal as the radar signal and a jamming division circuit that transmits the multi-tone signal as the jamming signal, Multi-tone radar. (Appendix 2) an integrated processing circuit that allocates a part or all of the plurality of divided circuits to the divided circuits for the radar or the divided circuits for jamming power; the integrated processing circuit designates a division circuit assigned to a frequency range including the frequency of the threat radar wave as the jamming division circuit; 2. A multi-tone radar as described in appended claim 1. (Appendix 3) The integrated processing circuit includes: a switching unit that switches between the radar waveform data and the jamming waveform data so as to output radar waveform data to the radar division circuit and output jamming waveform data to the jamming division circuit, 2. A multi-tone radar as described in appended claim 2. (Appendix 4) The integrated processing circuit includes a detection result acquisition unit that acquires a result of detecting the interference signal, switching the radar waveform data and the jamming waveform data in the switching unit based on an instruction signal output from the detection result acquisition unit; 4. A multi-tone radar as described in appended claim 3. (Appendix 5) a first signal generating circuit that generates a first local signal that is input to a mixer common to the plurality of dividing circuits and that defines a transmission and reception frequency range of the multi-tone radar; a plurality of second signal generating circuits that generate second local signals that are input to individual mixers for the plurality of division circuits and define which of the plurality of frequency ranges the corresponding division circuit corresponds to; Equipped with 5. A multi-tone radar as claimed in any one of claims 1 to 4. (Appendix 6) The integrated processing circuit individually controls the second signal generating circuit corresponding to the division circuit for interference, and generates a signal for interfering with power as the second local signal. 6. A multi-tone radar as described in appended claim 5. (Appendix 7) When the threat radar wave is hopping or agile, the integrated processing circuit individually controls the second signal generating circuit corresponding to the jamming division circuit to vary the frequency of the second local signal in accordance with the variation in the frequency of the threat radar wave. 7. The multi-tone radar of claim 5 or 6. (Appendix 8) the jamming splitting circuit includes a deception jamming splitting circuit that transmits a deception jamming signal generated based on the received threat radar wave; 8. A multi-tone radar as claimed in any one of claims 1 to 7. (Appendix 9) the integrated processing circuit has a DRFM (Digital Radio Frequency Memory) that temporarily stores the waveform of the threat radar wave received by the deception jamming division circuit and outputs a signal of the waveform of the threat radar wave with a set delay time; The deception jamming division circuit generates the deception jamming signal based on a signal having a waveform of the threat radar wave output from the DRFM. 9. The multi-tone radar of claim 8. (Appendix 10) One aerial and a duplexer for switching the one antenna between transmission and reception; Equipped with The duplexer switches between transmitting the radar signal and the jamming signal and receiving the echo signal and the threat radar wave. 10. The multi-tone radar of claim 8 or 9. (Appendix 11) a frequency separation between adjacent frequency ranges of the plurality of frequency ranges is equal to or greater than 1.0 / τ Hertz, where τ is a pulse width of the multi-tone signal; 11. A multi-tone radar as claimed in any one of claims 1 to 10. (Appendix 12) 1. A multi-tone radar transmission and reception method for transmitting a multi-tone signal as a jamming signal that jams a threat radar wave and a radar signal, and receiving a multi-tone signal including the radar signal reflected from a target as an echo signal, comprising: Transmitting the multi-tone signal by a plurality of dividing circuits in a plurality of frequency ranges obtained by dividing a transmission / reception frequency range of the multi-tone radar, At least one of the plurality of division circuits transmits the multi-tone signal as the jamming signal, and the other division circuits transmit the multi-tone signal as the radar signal. How to send and receive. [Explanation of symbols]

[0075] 11 antenna, 12 transmit / receive switch, 13, 31 amplifier, 14, 30 filter bank, 15, 29, 181-18n, 18x, 261-26n, 26x mixer, 16, 24, 33, 351-35n, 35x distributor, 22 integrated processing circuit, 23, 361-36n, 36x DA converter, 28, 40x combiner, 32 signal generating circuit 1, 100 multi-tone radar, 171-17n, 271-27n, 39x, 41x BPF (wide), 191-19n, 251-25n BPF (narrow), 201-20n AD converter, 211-21n signal processing circuit, 221 target detection data selection unit, 222 correlation determination unit, 223 target detection data output unit, 224 Radar waveform data generating unit, 225 detection result acquiring unit, 2261-226n switching unit, 2271-227n, 227x jamming waveform data generating unit, 2281-228n, 228x amplitude modulation unit, 2291-229n, 229x pulse modulation unit, 230 DRFM, 2311-231n, 231x 2nd Lo signal control unit, 232 memory unit, 341-34n, 34x signal generating second circuit, 371-37n, 37x ATT, 381-38n, 38x switch.

Claims

1. A multi-tone radar that transmits a multi-tone signal as a jamming signal that jams a threat radar wave and a radar signal, and receives a multi-tone signal including the radar signal reflected from a target as an echo signal, a plurality of dividing circuits for transmitting the multi-tone signals in a plurality of frequency ranges obtained by dividing the transmission and reception frequency range of the multi-tone radar, the plurality of division circuits include a radar division circuit that transmits the multi-tone signal as the radar signal and a jamming division circuit that transmits the multi-tone signal as the jamming signal, each of the plurality of split circuits is assignable as the radar split circuit or the jamming split circuit depending on the frequency of the threat radar wave; Multi-tone radar.

2. an integrated processing circuit that allocates some or all of the plurality of divided circuits to the divided circuits for radar or the divided circuits for jamming that jam power, the integrated processing circuit selects a division circuit assigned to a frequency range including the frequency of the threat radar wave as the jamming division circuit; 2. The multi-tone radar according to claim 1.

3. The integrated processing circuit includes: a switching unit that switches between the radar waveform data and the jamming waveform data so as to output radar waveform data to the radar division circuit and output jamming waveform data to the jamming division circuit; 3. The multi-tone radar according to claim 2.

4. the integrated processing circuit includes a detection result acquisition unit that acquires a result of detecting the interference signal; switching the radar waveform data and the jamming waveform data by the switching unit based on an instruction signal output from the detection result acquisition unit; 4. The multi-tone radar according to claim 3.

5. a first signal generating circuit that generates a first local signal that is input to a mixer common to the plurality of dividing circuits and that defines a transmission / reception frequency range of the multi-tone radar; a plurality of second signal generating circuits that generate second local signals that are input to individual mixers for the plurality of dividing circuits and define which of the plurality of frequency ranges the corresponding dividing circuit corresponds to; Equipped with 2. The multi-tone radar according to claim 1.

6. the integrated processing circuit individually controls the second signal generating circuits corresponding to the division circuits for interference to generate a signal for power interference as the second local signal; 6. The multi-tone radar according to claim 5.

7. When the threat radar wave is hopping or agile, the integrated processing circuit individually controls the second signal generating circuits corresponding to the jamming splitting circuits to vary the frequency of the second local signal in accordance with the variation in the frequency of the threat radar wave.

6. The multi-tone radar according to claim 5.

8. the jamming splitting circuit includes a deceptive jamming splitting circuit that transmits a deceptive jamming signal generated based on the received threat radar wave; A multi-tone radar according to any one of claims 1 to 7.

9. the integrated processing circuit has a DRFM (Digital Radio Frequency Memory) that temporarily stores the waveform of the threat radar wave received by the deception jamming division circuit and outputs a signal of the waveform of the threat radar wave with a set delay time; the deception jamming division circuit generates the deception jamming signal based on a signal of the waveform of the threat radar wave output from the DRFM; 9. The multi-tone radar according to claim 8.

10. One antenna and a duplexer for switching the one antenna between transmission and reception; Equipped with the duplexer switches between transmitting the radar signal and the jamming signal and receiving the echo signal and the threat radar wave; 9. The multi-tone radar according to claim 8.

11. a frequency separation between adjacent frequency ranges of the plurality of frequency ranges is equal to or greater than 1.0 / τ hertz, where τ is a pulse width of the multi-tone signal; A multi-tone radar according to any one of claims 1 to 7.

12. A multi-tone radar transmission and reception method for transmitting a multi-tone signal as a jamming signal and a radar signal that jams a threat radar wave, and receiving a multi-tone signal including the radar signal reflected from a target as an echo signal, the method comprising: The multi-tone signal is transmitted by a plurality of dividing circuits in a plurality of frequency ranges obtained by dividing the transmission / reception frequency range of the multi-tone radar, at least one of the plurality of split circuits is assigned to transmit the jamming signal and the other split circuits are assigned to transmit the radar signal in accordance with the frequency of the threat radar wave; each of the plurality of division circuits transmits the multi-tone signal as the jamming signal or the radar signal according to the allocation to the division circuit; Sending and receiving methods.

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