JP2005180970A - Radar target identification system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To identify an object utilizing many singular points (characteristic resonance frequency) by attaining high resolution by widening the frequency band width of the radar signal into an ultra broad band without extinguishing information of secondary response signal of the received radar signal, at the time of widening frequency band of the received radar signal while transmitting the radar signal to the target and receiving the reflected waves from the target, regarding the system for identifying a target to be observated by the radar. <P>SOLUTION: Each of a first and a second radar signal is separated into a primary and a secondary response signal by a threshold value on the time axis and in the primary and the secondary response signals each of the first and the second radar signals are made coherent, and expanded in the band width by linear estimation. The band expanded primary and secondary response signals are incorporated, and the number of response, intensity, and the difference between the distance of the incorporated radar signals are verified with the data base. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for identifying a target to be observed by radar (radar: radio detection and ranging), and in particular, transmits a radar wave to the target, receives a reflected wave from the target, and receives the received radar. The present invention relates to a radar target identification device that identifies a target by expanding a frequency band of a signal to achieve high resolution.

  The radar device transmits a radar wave to the target to be observed, receives a reflected wave from the target, analyzes and processes the received radar signal, and derives the presence / absence of the target and the distance from the target. Therefore, the bandwidth of the radar wave to be transmitted is related to the distance resolution and the positioning ability.

  In recent years, the US FCC (Federal Communications Commission) has recognized the limited use of UWB (ultra wideband) for civilian use, but with the extremely short pulse duration characteristic of UWB, high range resolution Therefore, application to radar utilizing the fact that high-accuracy positioning can be performed is being studied (see, for example, Non-Patent Document 1).

  In addition, as a technology for detecting a target using an ultra-wideband signal as a radar wave, the radar wave of the first frequency band and the radar wave of the second frequency band are transmitted and received, and the band is expanded from each received radar signal. A technique for obtaining a radar signal is disclosed (see, for example, Patent Document 1).

  FIG. 26 is a functional configuration diagram for explaining the prior art, wherein 1 is a low-band radar wave transmitting / receiving unit that transmits and receives radar waves in a low frequency band, which is the first frequency band, and 2 is a second frequency band. 45 is a high-bandwidth radar wave transmitting / receiving means for transmitting and receiving a radar wave in a high frequency band, 45 is a coherent processing means for making the received radar signals (1) and (2) in the respective frequency bands coherent, 55 Linear prediction is performed based on the coherent radar signals (451) and (452), and signals between the first frequency band and the second frequency band are inserted (hereinafter referred to as interpolation). Reference numeral 7 denotes a band extension means for extending the band, and reference numeral 7 denotes a target identification processing means for identifying a target from the band extended radar signal (55) whose band has been extended. In the drawings, the same or similar elements are denoted by the same reference numerals. The lower case numbers with () indicate signals.

  FIG. 27 is a diagram for explaining the functional operation of the prior art. A conventional radar target identification apparatus will be described with reference to FIGS. 26 and 27. FIG.

The low-band radar transmission / reception unit 1 and the high-band radar wave transmission / reception unit 2 transmit radar waves in different frequency bands to the target to be observed and receive the reflected wave from the target. The received radar signals (1) and (2) are as shown in FIG. The coherent processing means 45 processes the radar signals (1) and (2) so that they are phase-coherent with each other as shown in FIG. The band expanding means 55 linearly predicts signals between the respective bands using the radar signals (451) and (452) processed coherently with each other, and interpolates between the bands as shown in FIG. 27 (c). In this way, an ultra-wide band extended radar signal (55) is created. The target identification processing means 7 creates a high-resolution range profile from the band extended radar signal (55), and compares the number and intensity of responses, the difference in distance between responses, etc. with a database (not shown) to identify the target. Do.
US Pat. No. 5,945,940 Kobayashi, “About UWB technology in radar”, IEICE, MW / WBS co-sponsored panel discussion, theme “UWB system” OHP material, May 22, 2003

  FIG. 28 is a diagram (1) for explaining the problems of the prior art, and shows a received wave in which a transmitted radar wave is reflected by a target and returned. The received wave includes a wave (regular reflected wave) that directly reflects and reflects the target when the radar wave is reflected by the target, a wave that diffracts by hitting the edge of the target, repeatedly diffracts around the target, and returns ( Creeping waves). Therefore, when a radar wave, which is an extremely short pulse (impulse) signal, is transmitted to the target, the received wave (received signal) is a primary response wave (primary response signal) by a regular reflected wave and a secondary response wave by a creeping wave. (Secondary response signal). The regular reflected wave is reflected directly on the target and therefore depends on the target appearance. However, since the creeping wave circulates around the target, it does not depend on the target appearance and is specific to the target shape and material. . Therefore, the secondary response signal by the creeping wave includes a target singular point (natural resonance frequency), and the target can be identified by extracting the singular point and collating it with a database. Furthermore, by broadening the received radar wave, it is possible to obtain a response signal that includes more singular points of the target, and by extracting the singular points from the response signal and collating them with a database, Accurate target identification is possible.

  FIG. 29 is a diagram (2) for explaining the problems of the prior art. In the case where the target does not reduce the RCS (radar cross section), that is, the target shape is not stealth (a ) And the case where the target shape is stealthed in order to reduce the RCS, the primary response signal and the secondary response signal are shown in (b). In the case of a target whose body shape is made stealth in order to reduce the RCS, it is difficult to detect the target and search for the distance from the target as shown in the primary response signal in FIG. On the other hand, since the secondary response signal can be acquired even in the case of a target whose body shape is stealth, acquiring the secondary response signal is an effective means for target identification.

  However, in the band expansion using the entire reflected wave from the target (the reflected wave including the primary response signal and the secondary response signal), the secondary response signal with low reception intensity is discarded from the reflected wave, and creeping is performed. It becomes difficult to extract a singular point depending on the shape and material of the target included in the secondary response signal that is a wave component, and high-precision target identification cannot be expected.

  As described above, in the conventional band expansion in which the band is expanded by the radar signal of the first frequency band and the radar signal of the second frequency band, the secondary response signal that is a component of the creeping wave of the radar signal is applied. Extraction of singular points depending on the shape and material of the target included is difficult, and high-precision target identification cannot be expected.

  The present invention relates to an apparatus for identifying a target to be observed by a radar, particularly when a radar wave is transmitted to a target, a reflected wave from the target is received, and a frequency band of the received radar signal is expanded. The frequency response of the radar signal was made ultra-wide without extinguishing the information of the secondary response signal of the received radar signal, and more singular points (natural resonance frequencies) of the target were used by increasing the resolution. An object of the present invention is to provide a radar target identification device for identifying a target.

The present invention identifies a target by transmitting a radar wave to a target to be observed, receiving a reflected wave from the target, and expanding the frequency band of the received radar signal to increase the resolution. In the radar target identification device,
First radar wave transmitting / receiving means for transmitting a radar wave in the first frequency band and receiving the reflected wave, and second radar wave transmitting / receiving means for transmitting a radar wave in the second frequency band and receiving the reflected wave For each of the first radar signal received by the first radar wave transmitting / receiving unit and the second radar signal received by the second radar wave transmitting / receiving unit, a threshold on the time axis is provided to Radar signal separating means for separating the reflected wave into primary response and secondary response signals, and the phase of the first radar signal for each of the primary response signal and the secondary response signal, and the second radar. Coherent processing means for matching the phase of the signal, band extension means for extending the frequency band of the radar signal by interpolating the signal between the first frequency band and the second frequency band by linear prediction, Above A band extended radar signal combining means for adding and combining the amplitudes of the primary response radar signal and the secondary response radar signal having an extended wave number band on the time axis, and a radar signal by the band extended radar signal combining means. The target profile is identified by creating a range profile including the primary response component and the secondary response component, and collating the number and intensity of responses in the primary response signal and the secondary response signal, and the distance difference between the responses as a database. A radar target identification device comprising: target identification processing means for performing.

  According to the present invention, a threshold on the time axis is provided for a radar signal to separate the reflected wave from the target into a primary response signal and a secondary response signal, and band extension processing is performed on each of the primary response signal and the secondary response signal. Therefore, it is possible to extract singular points that depend on the shape and material of the target included in the secondary response signal. It is possible to provide a radar target identification device that performs target identification using a singular point (natural resonance frequency).

  The radar target identification apparatus according to the present invention provides a time axis for each of the first radar signal received by the first radar wave transmission / reception means and the second radar signal received by the second radar wave transmission / reception means. A threshold is provided to separate a primary response signal and a secondary response signal of a reflected wave from the target, and a band for each of the primary response signal and the secondary response signal of each of the first radar signal and the second radar signal. By performing extended processing and combining the primary response signal and the secondary response signal, it is possible to collate a lot of information with the database without erasing the secondary response signal that contains information dependent on the shape and material specific to the target. Highly accurate target identification is possible. Further, the distance resolution with respect to the target can be improved.

  Hereinafter, the details of the present invention will be described with reference to the drawings. Here, the first frequency band is expressed as a low band, and the second frequency band is expressed as a high band.

  FIG. 1 is a functional block diagram (1) according to the present invention, wherein 1 is a low-band radar wave transmission / reception means, 2 is a high-band radar wave transmission / reception means, 3a and 3b are radar signal separation means, and 4a and 4b are coherent processing means. Reference numerals 5a and 5b denote band extension means, 6 denotes a band extension radar signal combining means, and 7 denotes a target identification processing means.

  FIG. 2 is a diagram (1) for explaining the functional operation according to the present invention.

  FIG. 3 is a diagram (2) for explaining the functional operation according to the present invention.

  FIG. 4 is a diagram (3) for explaining the functional operation according to the present invention.

  FIG. 5 is a diagram (4) for explaining the functional operation according to the present invention.

  In FIG. 1, a low-band radar wave transmission / reception means 1 transmits a low-frequency band radar wave to a target to be observed, receives a reflected wave from the target, and converts it to a low-band radar signal (1). . The high-band radar wave transmitting / receiving means 2 transmits a high-frequency band radar wave to the target to be observed, receives the reflected wave from the target, and converts it into a high-band radar signal (2).

  As shown in FIG. 2, the radar signal separating means 3a converts the low-band radar signal (1) from a frequency domain radar signal to a time domain radar signal by inverse Fourier transform (IFFT) ((a) (b). In accordance with a time threshold described later, a primary response signal that is a normal reflected wave component and a secondary response signal that is a creeping wave component are separated (shown in (b1) and (b2)), and a Fourier transform (FFT) ) Is converted into a primary response signal (3a1) and a secondary response signal (3a2) in the frequency domain (shown in (c1) and (c2)). Similarly, the radar signal separation means 3b converts the high-band radar signal (2) from a frequency domain radar signal to a time domain radar signal by inverse Fourier transform, and separates it into a primary response signal and a secondary response signal by a time threshold. The frequency domain primary response signal (3b1) and secondary response signal (3b2) are converted by Fourier transform.

Here, the time threshold is set by the target size and the reception start time of the regular reflected wave,
(Time threshold) = (Regular reflected wave reception start time) + 2 × (Assumed target size) / (Speed of light)
It becomes.

  As shown in FIG. 3, the coherent processing means 4a uses the primary response signal (3a1) of the low-band radar signal and the primary response signal (3b1) of the high-band radar signal to change the phase of the low-band radar signal to that of the high-band radar signal. Match the phase (shown in (d1) (d2) (e)). Similarly, the coherent processing means 4b matches the secondary response signal (3a2) of the low-band radar signal with the phase of the secondary response signal (3b2) of the high-band radar signal.

  As shown in FIG. 3, the band extending means 5a is configured to convert the primary response signal (4a1) of the coherent low band radar signal and the primary response signal (4a2) of the high band radar signal between the low band and the high band. By interpolating the signal with a low-band radar signal by linear prediction (shown in (e) and (f)), a band-expanded radar signal (5a) having a primary response with a wide band is created. Similarly, the band extension means 5b linearly converts the signal between the low band and the high band into a secondary response signal (4b1) of the coherent low band radar signal and a secondary response signal (4b2) of the high band radar signal. A wide band extended radar signal (5b) with a secondary response is generated by interpolation with a low-band radar signal by prediction.

  The band extension radar signal combining means 6 converts the primary response band extension radar signal (5a) from a frequency domain radar signal to a time domain radar signal as shown in FIG. 4 (shown in (g1) and (h1)). ). Similarly, the secondary response band extension radar signal (5b) is converted from a frequency domain radar signal to a time domain radar signal (shown in (g2) and (h2)). Then, the time scales of the band extension radar signal of the primary response and the band extension radar signal of the secondary response are matched and combined by adding the amplitude (shown in (h1) (h2) (i)), and Fourier transform (FFT) ) To convert the frequency band into a combined band extended radar signal (6) (shown in (i) and (j)). Therefore, the combined-band extended radar signal (6) is a radar signal with an ultra-wideband that includes both the primary response component of the regular reflected wave and the secondary response component of the creeping wave.

  As shown in FIG. 5, the target identification processing means 7 converts the combined band-extended radar signal (6) into the time domain by inverse Fourier transform (IFFT) to create an ultra-high resolution range profile ((j) (k) To show). The horizontal axis of (k) indicates the distance. Then, from the ultra-high resolution range profile, the number of responses of the primary response signal and the secondary response signal, the strength of the response, and the distance difference between the responses are read and collated with the database (shown in (l)) to identify the target To do.

  FIG. 6 is a diagram (1) for explaining an embodiment of the present invention, FIG. 7 is a diagram (2) for explaining an embodiment of the present invention, and the functions of the present invention explained in FIGS. 1 to 5 above. The operation will be described as an example.

The radar wave in the frequency band of 8.0 to 8.2 GHz is transmitted from the low band radar wave transmitting / receiving means 1 to the target shown in FIG. Similarly, a radar wave having a frequency band of 8.8 to 9.0 GHz is transmitted from the high-band radar wave transmitting / receiving unit 2 to the target shown in FIG. A radar signal obtained by receiving and converting each reflected wave from the target is as shown in FIG. Here, the low-band radar signal and the high-band radar signal are converted into the time domain by performing Fourier inverse transform (IFFT), and multiplied by the speed of light (3 × 10 ⁸ m / s) to obtain the range shown in FIG. You can create a profile. Based on the peak value of the range profile of the low-band radar signal and the high-band radar signal in FIG. However, since the low bandwidth radar signal and the high bandwidth radar signal each have a frequency bandwidth of 200 MHz, the distance resolution is
(3 × 10 ⁸ ) / (200 × 10 ⁶ × 2) = 0.75 m
Therefore, it is difficult to obtain detailed target information.

Here, when the radar signal between the low band and the high band (vacant band) is band-extended as described above, a combined band expansion radar signal ((6) in FIG. 1) is obtained. ) Is obtained, and the frequency band is 1 GHz. When the range profile of the combined band extended radar signal is created in the same manner as described above, the result is as shown in FIG.
(3 × 10 ⁸ ) / (1 × 10 ⁹ × 2) = 0.15 m
Therefore, the distance resolution can be improved.

  In addition, since the broadband radar signal shown in FIG. 6C includes a primary response signal and a secondary response signal, the number of scattered responses of each response, the amplitude intensity, a target difference such as a distance difference between responses, and the like. Detailed information can be acquired. As shown in FIG. 7G, the target information is collated with the target information for each model that is the target of the database, thereby enabling highly accurate target identification.

  On the other hand, when the signal between the low band and the high band is expanded by the conventional apparatus without separating and combining the primary response signal and the secondary response signal, a range profile as shown in FIG. 6 (f) is created. it can. In this case, since the information included in the secondary response signal cannot be acquired, there is no target specific information such as the target shape and material, and high-precision target identification cannot be expected.

  FIG. 8 is a diagram (5) for explaining the functional operation according to the present invention.

  The functional operations of the coherent processing means 4a, 4b and the band extending means 5a, 5b described in the first embodiment are different. In this embodiment, the phase of the high-band radar signal is matched with the phase of the low-band radar signal. The signal between is interpolated with a high-bandwidth radar signal.

  As shown in FIG. 8, the coherent processing means 4a uses the primary response signal (3a1) of the low-band radar signal and the primary response signal (3b1) of the high-band radar signal to change the phase of the high-band radar signal to that of the low-band radar signal. Match the phase (shown in (d1) (d2) (e2)). Similarly, the coherent processing unit 4b matches the phase of the secondary response signal (3b2) of the high-band radar signal with the phase of the secondary response signal (3a2) of the low-band radar signal.

  As shown in FIG. 8, the band extending means 5a is configured to convert the primary response signal (4a1) of the coherent low band radar signal and the primary response signal (4a2) of the high band radar signal between the low band and the high band. By interpolating the signal with a high-bandwidth radar signal by linear prediction (shown in (e2) and (f2)), a band-expanded radar signal (5a) with a primary response that has been widened is created. Similarly, the band extension means 5b linearly converts the signal between the low band and the high band into a secondary response signal (4b1) of the coherent low band radar signal and a secondary response signal (4b2) of the high band radar signal. By interpolating with a high-bandwidth radar signal by prediction, a broadband extended-band radar signal (5b) having a broadened secondary response is created.

  FIG. 9 is a diagram (6) for explaining the functional operation according to the present invention.

  The functional operations of the coherent processing means 4a and 4b and the band extending means 5a and 5b described in the first embodiment are different. In this embodiment, the phases of the low-band radar signal and the high-band radar signal are adjusted to an arbitrary phase. The inter-band signal is interpolated with each of the low-band radar signal and the high-band radar signal.

  As shown in FIG. 9, the coherent processing means 4 a uses the primary response signal (3 a 1) of the low-band radar signal and the primary response signal (3 b 1) of the high-band radar signal to change the phase of the low-band radar signal and the high-band radar signal. The phase is adjusted to an arbitrary phase (shown in (d1), (d2), and (e3)). Similarly, the coherent processing means 4b matches the phase of the secondary response signal (3a2) of the low-band radar signal and the secondary response signal (3b2) of the high-band radar signal to an arbitrary phase.

  As shown in FIG. 9, the band extending means 5a is configured to convert the primary response signal (4a1) of the coherent low band radar signal and the primary response signal (4a2) of the high band radar signal between the low band and the high band. The signal is interpolated by linear prediction with each of the low-band radar signal and the high-band radar signal (shown in (e3) and (f3)) to create a band-expanded radar signal (5a) having a broadened primary response. Similarly, the band extension means 5b linearly converts the signal between the low band and the high band into a secondary response signal (4b1) of the coherent low band radar signal and a secondary response signal (4b2) of the high band radar signal. By interpolating with each of the low-band radar signal and the high-band radar signal by prediction, a band-extended radar signal (5b) having a secondary response with a wide band is created.

  FIG. 10 is a functional block diagram (2) according to the present invention. Extrapolating means for extending the band by interpolating the band extending means 5a and 5b described in the first embodiment (inserting a radar signal between bands outside the band) ) To expand the bandwidth.

  FIG. 11 is a diagram (7) for explaining the functional operation according to the present invention.

  As shown in FIG. 11, the coherent processing means 41a uses the primary response signal (3a1) of the low-band radar signal and the primary response signal (3b1) of the high-band radar signal to change the phase of the low-band radar signal to that of the high-band radar signal. Match the phase (shown in (d1) (d2) (e4)). Similarly, the coherent processing means 41b matches the phase of the secondary response signal (3a2) of the low-band radar signal with the phase of the secondary response signal (3b2) of the high-band radar signal.

  As shown in FIG. 11, the band extending means 81a generates a primary response signal (41a1) and a primary response signal (41a2) of the coherent low band radar signal between the low band and the high band. The signal is extrapolated by linear prediction with a low-band radar signal (shown in (e4) and (f4)) to create a band-expanded radar signal (81a) with a primary response that has been widened. Similarly, the band extension means 81b reduces the signal between the low band and the high band to the secondary response signal (41b1) of the coherent low band radar signal and the secondary response signal (41b2) of the high band radar signal. A band-expanded radar signal (81b) having a secondary response with a wider bandwidth is generated by extrapolation by linear prediction with a band radar signal.

  FIG. 12 is a diagram (8) for explaining the functional operation according to the present invention.

  The functional operations of the coherent processing means 41a and 41b and the band extending means 81a and 81b described in the fourth embodiment are different. In this embodiment, the phase of the high-band radar signal is adjusted to the phase of the low-band radar signal. The signal between them is extrapolated with a high-bandwidth radar signal.

  As shown in FIG. 12, the coherent processing means 41a converts the phase of the high-band radar signal into the low-band radar signal phase in the primary response signal (3a1) of the low-band radar signal and the primary response signal (3b1) of the high-band radar signal. Match the phase (shown in (d1) (d2) (e5)). Similarly, the coherent processing means 41b matches the phase of the secondary response signal (3b2) of the high-band radar signal with the phase of the secondary response signal (3a2) of the low-band radar signal.

  As shown in FIG. 12, the band extension means 81a generates a primary response signal (41a1) and a primary response signal (41a2) of the coherent low-band radar signal between the low-band and high-band bands. The signal is extrapolated by linear prediction with a high-bandwidth radar signal (shown in (e5) and (f5)) to create a band-expanded radar signal (81a) with a primary response that has been widened. Similarly, the band extension means 81b increases the signal between the low band and the high band to the secondary response signal (41b1) of the coherent low band radar signal and the secondary response signal (41b2) of the high band radar signal. A band-expanded radar signal (81b) having a secondary response with a wider bandwidth is generated by extrapolation by linear prediction with a band radar signal.

  FIG. 13 is a diagram (9) for explaining the functional operation according to the present invention.

  The functional operations of the coherent processing means 41a and 41b and the band extending means 81a and 81b described in the fourth embodiment are different. In this embodiment, the phases of the low-band radar signal and the high-band radar signal are adjusted to an arbitrary phase. The signal between the bands is extrapolated by each of the low-band radar signal and the high-band radar signal.

  As shown in FIG. 13, the coherent processing means 41a uses the primary response signal (3a1) of the low-band radar signal and the primary response signal (3b1) of the high-band radar signal as shown in FIG. The phase is adjusted to an arbitrary phase (shown in (d1), (d2), and (e6)). Similarly, the coherent processing means 41b matches the phase of the secondary response signal (3a2) of the low-band radar signal and the secondary response signal (3b2) of the high-band radar signal to an arbitrary phase.

  As shown in FIG. 13, the band extension means 81a generates a primary response signal (41a1) and a primary response signal (41a2) of the high band radar signal between the low band and the high band. The signal is extrapolated by linear prediction for each of the low-band radar signal and the high-band radar signal (shown in (e6) and (f6)) to generate a band-expanded radar signal (81a) having a broadened primary response. . Similarly, the band extension means 81b reduces the signal between the low band and the high band to the secondary response signal (41b1) of the coherent low band radar signal and the secondary response signal (41b2) of the high band radar signal. A band-expanded radar signal (81b) having a widened secondary response is generated by extrapolation by linear prediction for each of the band radar signal and the high band radar signal.

  FIG. 14 is a functional configuration diagram (3) according to the present invention. In the fourth embodiment, the primary response signals of the low-band radar signal and the high-band radar signal are made coherent by the coherent processing means 41a and the band extending means 81a. Although the band extension radar signal (81a) is created by band extension, in this embodiment, the band extension radar signal is created by coherentizing the band-expanded primary response signal.

  FIG. 15 is a diagram (10) for explaining the functional operation according to the present invention.

  As shown in FIG. 15, the band extending means 82a reduces the signal between the low band and the high band to the primary response signal (3a1) of the low band radar signal and the primary response signal (3b1) of the high band radar signal. The band extended radar signal (82a1) of the primary response of the low-band radar signal that has been widened by extrapolation by linear prediction with the band radar signal (shown in (d1), (d2), and (e7)), the high-band radar signal The band extension radar signal (82a2) of the primary response is generated. Similarly, the band extension means 82b converts the signal between the low band and the high band into the secondary response signal (3a2) of the low band radar signal and the secondary response signal (3b2) of the high band radar signal. The second-order band extended radar signals (82b1) and (82b2) are generated by extrapolation by linear prediction at.

  As shown in FIG. 15, the coherent processing means 42a is extrapolated from the low-band radar signal in the primary response signal (82a1) of the low-band radar signal and the primary response signal (82a2) of the high-band radar signal. The phase of the radar signal is matched with the phase of the high-band radar signal (shown in (e7) and (f7)). Similarly, the coherent processing means 42b uses a radar that is extrapolated from the low-band radar signal in the secondary response signal (82b1) of the low-band radar signal and the secondary response signal (82b2) of the high-band radar signal. Match the phase of the signal to that of the high-bandwidth radar signal.

  FIG. 16 is a diagram (11) for explaining the functional operation according to the present invention.

  The functional operations of the band extension means 82a and 82b and the coherent processing means 42a and 42b described in the seventh embodiment are different. In this embodiment, signals between bands are divided into low-band radar signals and high-band radar signals, respectively. The band is expanded by extrapolation, and the phase of the low-band radar signal and the radar signal extrapolated by the low-band radar signal is matched to the phase of the high-band radar signal and the radar signal extrapolated by the high-band radar signal. .

  As shown in FIG. 16, the band extension means 82a reduces the signal between the low band and the high band to the primary response signal (3a1) of the low band radar signal and the primary response signal (3b1) of the high band radar signal. Extrapolation is performed by linear prediction for each of the band radar signal and the high band radar signal (shown in (d1), (d2), and (e8)). Similarly, the band extension means 81b converts the signal between the low band and the high band into the secondary response signal (3a2) of the low band radar signal and the secondary response signal (3b2) of the high band radar signal. And extrapolation by linear prediction on each of the high-band radar signals.

  As shown in FIG. 16, the coherent processing means 42a uses a first response signal (82a1) and a first response signal (82a2) of the wideband low-band radar signal. The phase of the radar signal extrapolated by the radar signal is matched with the phase of the high-band radar signal and the radar signal extrapolated by the high-band radar signal (shown in (e8) and (f8)). Similarly, the coherent processing means 42b uses the low-band radar signal and the low-band radar signal in the secondary response signal (82b1) of the low-band radar signal whose band is extended and the secondary response signal (82b2) of the high-band radar signal. The phase of the radar signal extrapolated by is matched with the phase of the high-band radar signal and the radar signal extrapolated by the high-band radar signal.

  FIG. 17 is a diagram (12) for explaining the functional operation according to the present invention.

  The functional operations of the band extension means 82a and 82b and the coherent processing means 42a and 42b described in the seventh embodiment are different. In this embodiment, a part of signals between bands is extrapolated with a low-band radar signal, The band is expanded by extrapolating the remaining signal between the bands with the high-band radar signal, and the phase of the low-band radar signal and the radar signal extrapolated by the low-band radar signal is set to the high-band radar signal and the high-band radar. Match the phase of the radar signal extrapolated by the signal.

  As shown in FIG. 17, a part of the band extension means 82a between the low-band radar signal primary response signal (3a1) and the high-band radar signal primary response signal (3b1). The signal is extrapolated by linear prediction with a low-band radar signal, and the remaining signals between the bands are extrapolated by linear prediction with a high-band radar signal (shown in (d1) (d2) (e9)). Similarly, the band extension means 81b lowers some signals between the low band and the high band to the secondary response signal (3a2) of the low band radar signal and the secondary response signal (3b2) of the high band radar signal. Extrapolation is performed by linear prediction with a band radar signal, and the remaining signals between the bands are extrapolated by linear prediction with a high band radar signal.

  As shown in FIG. 17, the coherent processing means 42a uses a low-band radar signal and a low-band radar signal in the primary response signal (82a1) and the high-band radar signal primary response signal (82a2). The phase of the radar signal extrapolated by the radar signal is matched with the phase of the high-band radar signal and the radar signal extrapolated by the high-band radar signal (shown in (e9) and (f9)). Similarly, the coherent processing means 42b uses the low-band radar signal and the low-band radar signal in the secondary response signal (82b1) of the low-band radar signal whose band is extended and the secondary response signal (82b2) of the high-band radar signal. The phase of the radar signal extrapolated by is matched with the phase of the high-band radar signal and the radar signal extrapolated by the high-band radar signal.

  FIG. 18 is a diagram (13) for explaining the functional operation according to the present invention. In the band extension radar signal combining means 6 in the first embodiment, as described in FIG. The secondary response band-extended radar signal is converted into the time domain, and the amplitude is added in the time domain to combine the primary response and the secondary response band-extended radar signal. In this embodiment, in the frequency domain, The primary response and secondary response band extension radar signals are combined by adding the amplitudes of the primary response band extension radar signal and the secondary response band extension radar signal in the frequency domain ((g1) (g2) (i2) To show).

  As shown in FIG. 18, the band extension radar signal combining means 6 adds the amplitudes by matching the frequency scales of the primary response band extension radar signal (5a) and the secondary response band extension radar signal (5b). Then, the band extension radar signals of the primary response and the secondary response are combined (shown in (g1), (g2), and (i2)).

  FIG. 19 is a diagram (14) for explaining the functional operation according to the present invention. In the target identification processing means 7 in the first embodiment, as explained in FIG. 5, the primary response signal and the secondary are obtained from the ultra-high resolution range profile. The target is identified by reading the response quantity of the response signal, the strength of the response, and the distance difference between the responses and collating with the database. In this embodiment, the target is identified only by the information about the primary response signal.

  As shown in FIG. 19, the target identification processing means 7 converts the combined band-extended radar signal (6) into the time domain by inverse Fourier transform (IFFT) to create an ultra-high resolution range profile. Only the primary response signal is extracted from (shown in (j) (k) (k2)). The horizontal axis of (k) (k2) indicates the distance. Then, from the ultra-high resolution range profile (primary response), the number of responses of the primary response signal, the strength of the response, and the distance difference between the responses are read and collated with the database (shown in (l2)) to identify the target. .

  FIG. 20 is a diagram (15) for explaining the functional operation according to the present invention. In the target identification processing means 7 in the first embodiment, as described in FIG. 5, the primary response signal and the secondary response are obtained from the ultra-high resolution range profile. The target is identified by reading the number of responses of the response signal, the strength of the response, and the distance difference between the responses and collating with the database. In this embodiment, the target is identified only by the information on the secondary response signal.

  As shown in FIG. 20, the target identification processing means 7 converts the combined band extended radar signal (6) into the time domain by inverse Fourier transform (IFFT) to create an ultra-high resolution range profile. Only the secondary response signal is extracted from (shown in (j) (k) (k3)). The horizontal axis of (k) (k3) indicates the distance. Then, from the ultra-high resolution range profile (secondary response), the number of responses of the secondary response signal, the strength of the response, and the distance difference between responses are read and collated with the database (shown in (l3)). Identify.

  FIG. 21 is a diagram (16) for explaining the functional operation according to the present invention. In the target identification processing means 7 in the first embodiment, as described in FIG. 5, the singular point in the time domain from the ultra-high resolution range profile is shown. In this embodiment, the target is identified by collating the database with respect to the responses of the primary response signal and the secondary response signal, but in this embodiment, the singular points in the frequency domain of the primary response signal and the secondary response signal are collated with the database. To identify goals.

  As shown in FIG. 21, the target identification processing means 7 converts the combined band-extended radar signal (6) into the time domain by inverse Fourier transform (IFFT) to create an ultra-high resolution range profile ((j) (k) To show). The horizontal axis of (k) indicates the distance. Then, a primary response signal and a secondary response signal are respectively extracted from the ultra-high resolution range profile, and each of the primary response signal and the secondary response signal is analyzed in time series, and the quantity, phase, and singularity relating to the singular point in the frequency domain are analyzed. The target is identified by reading the phase difference between the points and collating with the database (shown in (k41) (k42) (l4)).

  FIG. 22 is a diagram (17) illustrating the functional operation according to the present invention, and only the singular point in the primary response signal is the target to be compared with the database of the target identification processing means 7 in the thirteenth embodiment.

  As shown in FIG. 22, the target identification processing means 7 converts the combined band-extended radar signal (6) into the time domain by inverse Fourier transform (IFFT) to create an ultra-high resolution range profile ((j) (k) To show). The horizontal axis of (k) indicates the distance. Then, a primary response signal and a secondary response signal are respectively extracted from the ultra-high resolution range profile, each of the primary response signal and the secondary response signal is analyzed in time series, and a quantity related to a singular point of the primary response signal in the frequency domain The target is identified by reading the phase difference between the singular points and the phase and comparing it with the database (shown in (k41) (k42) (l5)).

  FIG. 23 is a diagram (18) illustrating the functional operation according to the present invention, and only the singular point in the secondary response signal is the target to be checked against the database of the target identification processing means 7 in the thirteenth embodiment.

  As shown in FIG. 23, the target identification processing means 7 converts the combined band-extended radar signal (6) into the time domain by inverse Fourier transform (IFFT) to create an ultra-high resolution range profile ((j) (k) To show). The horizontal axis of (k) indicates the distance. Then, a primary response signal and a secondary response signal are respectively extracted from the ultra-high resolution range profile, each of the primary response signal and the secondary response signal is analyzed in time series, and a singular point of the secondary response signal in the frequency domain is obtained. The target is identified by reading the quantity, the phase, and the phase difference between the singular points and comparing them with the database (shown in (k41) (k42) (16)).

  FIG. 24 is a functional configuration diagram (4) according to the present invention. The configurations of the low-band radar wave transmission / reception means 1 and the high-band radar wave transmission / reception means 2 in the first embodiment are shown in FIG. As a radar wave receiving means for transmitting a radar wave and receiving the reflected wave, an intermediate band radar wave transmitting / receiving means using an intermediate band between the low band and the high band is used.

  In FIG. 24, the intermediate band radar wave transmission / reception means 9 transmits an intermediate frequency band radar wave to the target to be observed, receives the reflected wave from the target, and converts it to an intermediate band radar signal (9). .

  The radar signal separation means 3c converts the intermediate-band radar signal (9) from a frequency domain radar signal to a time domain radar signal by inverse Fourier transform, and is a primary response signal and a creeping wave component which are normal reflected wave components. The signal is separated into secondary response signals and converted into a primary response signal (3c1) and a secondary response signal (3c2) in the frequency domain by Fourier transform.

  The band extension means 83a is configured to extrapolate the low-band and high-band signals to the primary response signal (3c1) of the intermediate-band radar signal by linear prediction using the intermediate-band radar signal, thereby increasing the bandwidth of the primary response. Create an extended radar signal (83a). Similarly, the intermediate band extension means 83b is widened by extrapolating low band and high band signals to the secondary response signal (3c2) of the intermediate band radar signal by linear prediction with the intermediate band radar signal. A secondary response band extension radar signal (83b) is created.

  The band extension radar signal combining means 6 converts the primary response band extension radar signal (83a) from a frequency domain radar signal to a time domain radar signal. Similarly, the secondary response band expansion radar signal (83b) is converted from a frequency domain radar signal to a time domain radar signal. Then, the time scales of the primary response band extension radar signal and the secondary response band extension radar signal are matched and combined by adding the amplitude, and converted to the frequency domain combined band extension radar signal (6) by Fourier transform To do. Therefore, the combined-band extended radar signal (6) is a radar signal with an ultra-wideband that includes both the primary response component of the regular reflected wave and the secondary response component of the creeping wave.

  The target identification processing means 7 converts the combined band extended radar signal (6) into the time domain by inverse Fourier transform and creates an ultra-high resolution range profile. Then, the number of responses of the primary response signal and the secondary response signal, the strength of the response, and the distance difference between the responses are read from the ultra-high resolution range profile, and the target is identified by collating with the database.

  FIG. 25 is a functional block diagram (5) according to the present invention. As an operation of the band expanding means 5a and 5b in the first embodiment, a signal in a frequency band equal to or lower than the lower limit frequency of the low band is linearly expressed by a low band radar signal. Extrapolation is performed by prediction, and a band expansion radar signal having a wider band is created by extrapolating a signal in a frequency band higher than the upper limit frequency of the high band by high-frequency radar signal by linear prediction.

  In FIG. 25, the low-band radar wave transmission / reception means 1 transmits a radar wave of a low frequency band to the target to be observed, receives the reflected wave from the target, and converts it into a low-band radar signal (1). . The high-band radar wave transmitting / receiving means 2 transmits a high-frequency band radar wave to the target to be observed, receives the reflected wave from the target, and converts it into a high-band radar signal (2).

  The radar signal separating means 3a converts the low-band radar signal (1) from a frequency domain radar signal to a time domain radar signal by inverse Fourier transform, and a primary response signal which is a normal reflected wave component and a second component which is a creeping wave component. Separated into secondary response signals, and converted into primary response signals (3a1) and secondary response signals (3a2) in the frequency domain by Fourier transform. Similarly, the radar signal separation means 3b converts the high-band radar signal (2) into a primary response signal (3b1) and a secondary response signal (3b2) in the frequency domain.

  The coherent processing unit 4a matches the phase of the low-band radar signal with the phase of the high-band radar signal in the primary response signal (3a1) of the low-band radar signal and the primary response signal (3b1) of the high-band radar signal. Similarly, the coherent processing means 4b matches the secondary response signal (3a2) of the low-band radar signal with the phase of the secondary response signal (3b2) of the high-band radar signal.

  The band extending means 54a converts the signal between the low band and the high band into a primary response signal (4a1) and a primary response signal (4a2) of the coherent low band radar signal as a low band radar signal. Is interpolated by linear prediction. The band extension means 84a extrapolates a signal of a frequency band below the lower limit frequency of the low band by linear prediction with the primary response signal (4a1) of the coherent low band radar signal, and a frequency band above the upper limit frequency of the high band Are extrapolated by linear prediction with the primary response signal (4a2) of the coherent high-bandwidth radar signal. Similarly, the band extension means 54b applies a signal between the low band and the high band to the secondary response signal (4b1) of the coherent low band radar signal and the secondary response signal (4b2) of the high band radar signal. Interpolate by linear prediction with low-band radar signal. The band extension means 84b extrapolates the signal in the frequency band below the lower limit frequency of the low band by linear prediction with the secondary response signal (4b1) of the coherent low band radar signal, and the frequency above the upper limit frequency of the high band. The signal in the band is extrapolated by linear prediction with the secondary response signal (4b2) of the coherent high-band radar signal. Accordingly, a band extension radar signal having a primary response that is further broadened by combining the band extension radar signal (54a) by the band extension means 54a and the band extension radar signal (84a) by the band extension means 84a can be created. Further, a band extended radar signal having a secondary response with a wider bandwidth can be created by combining the band extended radar signal (54b) by the band extending means 54b and the band extended radar signal (84b) by the band extending means 84b.

  The band extension radar signal combining means 6 converts the band extension radar signal of the primary response having a wider bandwidth from a frequency domain radar signal into a time domain radar signal. Similarly, the band extension radar signal of the secondary response having a wider bandwidth is converted from a frequency domain radar signal to a time domain radar signal. The primary response band-extended radar signal and the secondary response band-extended radar signal are combined by matching the time scales and adding the amplitudes, and the frequency domain combined-band-extended radar signal (6) Convert to Therefore, the combined-band extended radar signal (6) is a radar signal with an ultra-wideband that includes both the primary response component of the regular reflected wave and the secondary response component of the creeping wave.

  The target identification processing means 7 converts the combined band extended radar signal (6) into the time domain by inverse Fourier transform and creates an ultra-high resolution range profile. Then, the number of responses of the primary response signal and the secondary response signal, the strength of the response, and the distance difference between the responses are read from the ultra-high resolution range profile, and the target is identified by collating with the database.

  Regarding the embodiment including the above Examples 1 to 17, the following additional notes are disclosed.

(Appendix 1)
Radar target identification device for identifying a target by transmitting a radar wave to a target to be observed, receiving a reflected wave from the target, and expanding the frequency band of the received radar signal to increase the resolution. In
First radar wave transmitting / receiving means for transmitting a radar wave in the first frequency band and receiving the reflected wave, and second radar wave transmitting / receiving means for transmitting a radar wave in the second frequency band and receiving the reflected wave For each of the first radar signal received by the first radar wave transmitting / receiving unit and the second radar signal received by the second radar wave transmitting / receiving unit, a threshold on the time axis is provided to Radar signal separating means for separating the reflected wave into primary response and secondary response signals, and the phase of the first radar signal for each of the primary response signal and the secondary response signal, and the second radar. Coherent processing means for matching the phase of the signal, band extension means for extending the frequency band of the radar signal by interpolating the signal between the first frequency band and the second frequency band by linear prediction, Above A band extended radar signal combining means for adding and combining the amplitudes of the primary response radar signal and the secondary response radar signal having an extended wave number band on the time axis, and a radar signal by the band extended radar signal combining means. The target profile is identified by creating a range profile including the primary response component and the secondary response component, and collating the number and intensity of responses in the primary response signal and the secondary response signal, and the distance difference between the responses as a database. A radar target identification device comprising: target identification processing means for performing.

(Appendix 2)
The radar target according to appendix 1, wherein the coherent processing means matches the phase of the second radar signal with the phase of the first radar signal for each of the primary response signal and the secondary response signal. Identification device.

(Appendix 3)
The coherent processing means adjusts the phase of the first radar signal and the phase of the second radar signal to arbitrarily the same phase for each of the primary response signal and the secondary response signal. Radar target identification device.

(Appendix 4)
The radar according to appendix 1, wherein the band extending means extrapolates the signal between the first frequency band and the second frequency band by performing a linear prediction using the first radar signal. Target identification device.

(Appendix 5)
The radar according to appendix 1, wherein the band extending means extrapolates the signal between the first frequency band and the second frequency band by performing a linear prediction using a second radar signal. Target identification device.

(Appendix 6)
The band extending means extrapolates a part of the signal between the first frequency band and the second frequency band by linear prediction using the first radar signal, and the first frequency band and the second frequency band are extrapolated. 2. The radar target identification device according to appendix 1, wherein the remaining part of the signal between the two frequency bands is extrapolated by performing linear prediction using the second radar signal.

(Appendix 7)
The band extending means linearly predicts a signal between the first frequency band and the second frequency band for each of the primary response signal and the secondary response signal using the first radar signal. And the coherent processing means matches the phase of the first radar signal and the radar signal extrapolated by the first radar signal to the phase of the second radar signal. The radar target identification device described.

(Appendix 8)
The band extension means converts the signal between the first frequency band and the second frequency band for each of the primary response signal and the secondary response signal into the first radar signal and the second radar signal. And extrapolating by linearly predicting each of the signals, and the coherent processing means determines the phase of the first radar signal and the radar signal extrapolated by the first radar signal as the second radar signal. The radar target identification device according to appendix 1, wherein the radar target phase is matched with the phase of the radar signal extrapolated by the second radar signal.

(Appendix 9)
Band extension means uses the first radar signal as a partial signal between the first frequency band and the second frequency band for each of the primary response signal and the secondary response signal. And extrapolating by linearly predicting the remainder of the signal between the first frequency band and the second frequency band using the second radar signal. The coherent processing means converts the phase of the radar signal extrapolated from the first radar signal and the first radar signal into the radar signal extrapolated from the second radar signal and the second radar signal. The radar target identification device according to appendix 1, wherein the radar target identification device is adapted to the phase of the radar.

(Appendix 10)
The radar according to appendix 1, wherein the band extension radar signal combining means adds and combines the amplitudes of the primary response radar signal and the secondary response radar signal whose frequency band are extended on the frequency axis. Target identification device.

(Appendix 11)
The target identification processing means creates a range profile including a primary response component and a secondary response component based on the radar signal from the band extension radar signal combining means, and determines the number and intensity of responses in the primary response signal, 2. The radar target identification apparatus according to appendix 1, wherein target identification is performed by collating the difference in distance as a database.

(Appendix 12)
The target identification processing means creates a range profile including a primary response component and a secondary response component based on the radar signal from the band extension radar signal combining means, and the number and intensity of responses in the secondary response signal, the response 2. The radar target identification apparatus according to appendix 1, wherein target identification is performed by collating a distance difference between them as a database.

(Appendix 13)
The target identification processing means creates a range profile including a primary response component and a secondary response component from the radar signal by the band extension radar signal combining means, and the number of singular points in the primary response signal and the secondary response signal. 2. The radar target identification apparatus according to appendix 1, wherein target identification is performed by collating the phase difference between the singular point and the phase as a database.

(Appendix 14)
The target identification processing means creates a range profile including a primary response component and a secondary response component based on the radar signal from the band-extended radar signal combining means, and determines the number and phase of singular points in the primary response signal and the singularity. The radar target identification apparatus according to appendix 1, wherein target identification is performed by comparing phase differences between points as a database.

(Appendix 15)
The target identification processing means creates a range profile including a primary response component and a secondary response component based on the radar signal from the band extension radar signal combining means, and the number and phase of singular points in the secondary response signal, The radar target identification apparatus according to appendix 1, wherein target identification is performed by collating a phase difference between singular points as a database.

(Appendix 16)
Radar target identification device for identifying a target by transmitting a radar wave to a target to be observed, receiving a reflected wave from the target, and expanding the frequency band of the received radar signal to increase the resolution. In
A radar wave transmission / reception unit that transmits a radar wave of one frequency band and receives the reflected wave, and a radar signal received by the radar wave transmission / reception unit is provided with a threshold on the time axis and the primary of the reflected wave from the target Radar signal separating means for separating a response signal and a secondary response signal; and a radar signal obtained by extrapolating the signal outside the one frequency band by linear prediction for each of the primary response signal and the secondary response signal. Band extending means for extending the frequency band of the signal, and band extending radar signal combining means for adding and combining the amplitudes of the primary response radar signal and the secondary response radar signal on the time axis. A range profile including a primary response component and a secondary response component is created from the radar signal by the band extension radar signal combining means, and the primary response signal and the secondary response signal are generated. Takes the number and intensity of the response, the radar target identification system, characterized in that it comprises a target identification processing means for performing a target identified by matching the distance difference between the response as a database.

(Appendix 17)
Radar target identification device for identifying a target by transmitting a radar wave to a target to be observed, receiving a reflected wave from the target, and expanding the frequency band of the received radar signal to increase the resolution. In
First radar wave transmitting / receiving means for transmitting a radar wave in the first frequency band and receiving the reflected wave, and second radar wave transmitting / receiving means for transmitting a radar wave in the second frequency band and receiving the reflected wave For each of the first radar signal received by the first radar wave transmitting / receiving unit and the second radar signal received by the second radar wave transmitting / receiving unit, a threshold on the time axis is provided to Radar signal separating means for separating the reflected wave into primary response and secondary response signals, and the phase of the first radar signal for each of the primary response signal and the secondary response signal, and the second radar. Coherent processing means for matching the phase of the signal, and a signal outside the first frequency band and the second frequency band by interpolating the signal between the first frequency band and the second frequency band by linear prediction. By linear prediction Band extension means for extending the frequency band of the radar signal by extrapolation, and combining the amplitudes of the primary response radar signal and the secondary response radar signal with the frequency band extended on the time axis. A range profile including a primary response component and a secondary response component is created by the band extended radar signal combining means and the radar signal by the band extended radar signal combining means, and the response of the response in the primary response signal and the secondary response signal is generated. A radar target identification device comprising: target identification processing means for performing target identification by collating the number, intensity, and distance difference between the responses as a database.

Functional configuration diagram according to the present invention (1) FIG. (1) for explaining functional operations according to the present invention FIG. (2) for explaining the functional operation according to the present invention FIG. 3 is a diagram for explaining a functional operation according to the present invention. FIG. 4 is a diagram for explaining a functional operation according to the present invention. FIG. 1 illustrates an embodiment of the present invention. FIG. 2 illustrates an embodiment of the present invention. FIG. 5 is a diagram for explaining a functional operation according to the present invention. FIG. 6 illustrates functional operations according to the present invention. Functional configuration diagram according to the present invention (2) FIG. 7 is a diagram for explaining a functional operation according to the present invention. FIG. 8 is a diagram for explaining a functional operation according to the present invention. FIG. 9 is a diagram for explaining the functional operation according to the present invention. Functional configuration diagram according to the present invention (3) FIG. 10 is a diagram for explaining a functional operation according to the present invention. FIG. 11 illustrates functional operations according to the present invention. FIG. 12 is a diagram for explaining a functional operation according to the present invention. FIG. 13 is a diagram for explaining a functional operation according to the present invention. FIG. 14 is a diagram for explaining a functional operation according to the present invention. FIG. 15 is a diagram for explaining the functional operation according to the present invention. FIG. 16 is a diagram for explaining the functional operation according to the present invention. FIG. 17 is a diagram for explaining a functional operation according to the present invention. FIG. 18 illustrates functional operations according to the present invention. Functional configuration diagram according to the present invention (4) Functional configuration diagram according to the present invention (5) Functional configuration diagram explaining conventional technology The figure explaining the functional operation of the prior art FIG. (1) for explaining the problems of the prior art FIG. (2) explaining the problem of the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Low band radar wave transmission / reception means 2 High band radar wave transmission / reception means 3a, 3b, 3c Radar signal separation means 4a, 4b, 41a, 41b, 42a, 42b, 45 Coherent processing means 5a, 5b, 54a, 54b, 55, 81a , 81b, 82a, 82b, 83a, 83b, 84a, 84b Band expanding means 6 Band extending radar signal combining means 7 Target identification processing means 9 Intermediate band radar wave transmitting / receiving means

Claims (5)

Radar target identification device for identifying a target by transmitting a radar wave to a target to be observed, receiving a reflected wave from the target, and expanding the frequency band of the received radar signal to increase the resolution. In
First radar wave transmitting / receiving means for transmitting a radar wave of a first frequency band and receiving the reflected wave;
Second radar wave transmitting / receiving means for transmitting a radar wave of the second frequency band and receiving the reflected wave;
For each of the first radar signal received by the first radar wave transmission / reception means and the second radar signal received by the second radar wave transmission / reception means, a reflected wave from the target is provided by providing a threshold on the time axis. Radar signal separating means for separating the first response signal and the second response signal;
Coherent processing means for adjusting the phase of the first radar signal to the phase of the second radar signal for each of the primary response signal and the secondary response signal;
Band extending means for extending the frequency band of the radar signal by interpolating a signal between the first frequency band and the second frequency band by linear prediction;
Band extension radar signal combining means for adding and combining the amplitudes of the primary response radar signal and the secondary response radar signal with the frequency band extended on the time axis;
A range profile including a primary response component and a secondary response component is created by a radar signal by the band extension radar signal combining means, and the number and intensity of responses in the primary response signal and the secondary response signal, and between the responses Target identification processing means for performing target identification by collating the distance difference as a database;
A radar target identification device comprising:   The coherent processing means matches the phase of the second radar signal with the phase of the first radar signal for each of the primary response signal and the secondary response signal. Radar target identification device.   The coherent processing means adjusts the phase of the first radar signal and the phase of the second radar signal to arbitrary same phases for each of the primary response signal and the secondary response signal. The radar target identification device according to 1.   The band extension means extrapolates the signal between the first frequency band and the second frequency band by performing a linear prediction using the first radar signal. The radar target identification device described. The band extending means extrapolates the signal between the first frequency band and the second frequency band by performing a linear prediction using a second radar signal. The radar target identification device described.

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