JPH10239430A - Moving target detecting radar device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably suppress the received echo from a fixed target without depending on the moving speed of a loading airplane as PRI(repeat period) is fixed, and surely judge the received echo of the moving target. SOLUTION: Received echoes captured by antenna elements T1-Tn are inputted to a central opening composer 35C through phase transfer equipments 331-33n, circulators 321-32n, and RF distributors 341-34n, the distributed output of RF distributors 341-34k and the distributed output of the RF distributors 34j-34n are inputted to a left opening composer 35L and a right opening composer 35R, respectively, and the composed outputs of each composer 35C, 35L, 35R are received and detected by receivers 36C, 36L, 36R, and regulated in amplitude phase by amplitude phase regulating circuits 37C, 37L, 37R, the received signal of the central opening system is added to each received signal of the left and right opening systems by a distributor 38, and adders 39L, 39R, the echo component from a fixed target is removed by DPCA processing of a DPCA processor 40, and the result is displayed on a moving target display device 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving target detecting radar device mounted on a moving body such as an aircraft.

[0002]

2. Description of the Related Art Generally, in a moving target detecting radar device mounted on an aircraft or the like, an array antenna is used.
A moving target is detected by removing radar echoes from a fixed target (clutter) by DPCA (Displaced Phase Center Antenna) processing and detecting only radar echoes from a moving target. Here, DPCA processing refers to MTI in ground radar.
(Moving target indication) means the same processing as the processing.

In a radar device mounted on a moving body, it is necessary to remove a relative velocity component between the antenna and a fixed target due to the movement of the antenna itself. FIG. 10 shows a method generally used as a method for removing a relative velocity component between an antenna and a fixed target.

A radar apparatus has a predetermined repetition period (PR
By transmitting a transmission pulse in I) and receiving a reflected signal (reception echo) from the target, the presence / absence of the target, position information, and the like can be obtained. In the received echo, in addition to the reflected wave from the target, the reflected wave (clutter) from a fixed target such as the ground or the sea surface is mixed, and it is necessary to remove this clutter component in order to extract the target signal. There is.

FIGS. 10A and 10B show transmission and reception timings in the radar apparatus, wherein FIG. 10A shows a transmission wave, and FIG. 10B shows a reception wave. Generally, in a radar device, the time T =
A subtraction process is performed using the respective reception echoes of the first transmission wave of 0 and the second transmission wave of time T = T1, thereby removing the reflected signal component from the fixed target.
At this time, since the moving target has a different relative distance between the radar device and the target, the phase component of the received signal composed of the first and second transmission waves shifts, and the above-described subtraction process also causes the shift. Not removed.

However, in this case, the distance between the radar device and the fixed target in the first and second transmission waves must be the same. For example, in a radar device mounted on an aircraft, the aircraft must fly. Moves the radar platform.

Therefore, in a conventional radar apparatus for mounting on a moving body, as shown in FIGS. 11 (a) and 11 (b), the first
The first transmitting and receiving aperture and the second transmitting and receiving aperture are formed at different positions with respect to the traveling direction as antenna apertures for transmitting and receiving data and the second transmitting and receiving, and the relative distance between each aperture and the fixed target is kept constant. Thus, a method of canceling the moving component of the radar is used.

That is, FIGS. 11A and 11B show a case where the radar platform moves rightward in the figure at a speed v. In FIG. 11A, at time T = 0, the first transmission wave is transmitted from the first transmission / reception aperture, and the phase center R is transmitted.
_T ), after being reflected from the fixed target, at time T = t1, the first
At the transmission / reception aperture (phase center R _R ). The transmission / reception distance between the phase center of the first transmission / reception aperture and the fixed target is represented by l _T + l _R.

In FIG. 11 (b), the second transmission wave is at time T
= T1 and transmitted from the second transmitting / receiving aperture (phase center L
_T ), after reflection from the fixed target, time T = T1 + t1
At the second transmitting / receiving aperture (phase center L _R ). The transmission / reception distance between the phase center of the second transmission / reception aperture and the fixed target is represented by l _T '+ l _R '.

Here, assuming that the interval between the phase centers of the first transmitting / receiving aperture and the second transmitting / receiving aperture is a, the distance between the radar and the first and second transmitting / receiving sections at the fixed target is constant (l _T + l).
_{In order to make R} = l _T '+ l _R '), the following equation must be satisfied. a = v · T1 (1) From the equation (1), the product of the moving speed (v) of the radar platform and the PRI (T1) is equal to the first transmitting / receiving aperture and the second.
It can be seen that the closer to the interval a between the phase centers of the transmitting and receiving apertures, the more effectively the received component from the fixed target can be removed.

FIG. 12 shows an application example of FIG. That is, FIG. 11 shows an example in which two apertures of the first transmission / reception aperture and the second transmission / reception aperture are provided as antenna apertures. However, in FIG. 12, the transmission aperture, the first reception aperture, and the second 3 has three reception apertures.

FIG. 12 also shows a case where the platform of the radar apparatus moves to the right side in the figure at a speed v. FIG.
In (a), at time T = 0, the first transmission wave is transmitted from the transmission aperture (phase center C _T ), and after being reflected from the fixed target, at time T = t1, the first reception aperture (phase center R). _R ). The transmission / reception distance between the phase center of the first reception aperture and the fixed target is represented by l _T + l _R.

In FIG. 12B, the second transmission wave is at time T
= T1 from the transmit aperture (phase center C _T ), and after being reflected from the fixed target, received at the second receive aperture (phase center L _R ) at time T = T1 + t1. The transmission / reception distance between the phase center of the second reception aperture and the fixed target is l _T '+1
_R '.

Assuming that the intervals of the phase centers of the transmission aperture and the first reception aperture, the transmission aperture and the second reception aperture, and the first reception aperture and the second reception aperture are b, c and 2a ', respectively, 2a'
= B + c. A transmission wave is transmitted from the transmission aperture, is reflected by the target, and is transmitted to the first reception aperture or the second reception aperture.
Assuming that the moving distance of the antenna aperture (C _T , C _{R in} FIG. 12A) until reception by the reception aperture is d, the distance between the radar apparatus and the first and second transmission / reception at the fixed target is constant. To satisfy (l _T + l _R = l _T '+ l _R '), the following expression must be satisfied. b + d = cd = v · T1 (2) In general, the expression (2) is approximately replaced by the following expression. 2a ′ = 2v · T1 (3) From equation (3), twice the product of the moving speed (v) of the radar platform and the PRI (T1) is the phase center of the first reception aperture and the second reception aperture. It can be understood that the closer to half a ′ of the interval, the more effectively the received component from the fixed target can be removed.

Particularly, in the configuration of FIG.
And the second receiving aperture can be larger than
In particular, in the case of an active phased array in which transmission / reception modules are arranged in an antenna aperture, transmission peak power and transmission gain can be increased, which is extremely effective in terms of power efficiency.

However, in the above conventional method, the first and the second
It is difficult to make the interval a or 2a 'between the phase centers of the transmitting and receiving apertures or the receiving apertures variable. For this reason, the flight speed of the aircraft is usually kept constant, or the PRI is controlled according to the flight speed.

However, if the PRI is made variable, there is a possibility that a distance range in which ambiguity does not occur cannot be sufficiently secured. Further, the filter characteristic for removing the fixed target echo due to the MTI also changes.

For example, a slow target (fixed target (clutter))
(A target having a small speed difference from the target) is close to the Doppler component from the fixed target because the Doppler frequency of the slow target is small. Therefore, in order to remove the reception component from the fixed target and extract the reception component from the low-speed target, it is necessary to optimize the cutoff region of the MTI filter. When the PRI is changed for such a low-speed target detection process, the frequency characteristic of the MTI filter changes each time the PRI is changed, so that it is difficult to always maintain the desired frequency characteristic of the filter.

As described above, when PRI control is performed, there is a restriction on radar performance. In addition, to keep the flight speed constant is not always an effective method because restrictions are imposed on weather conditions, airframe performance, and the like.

As a method for forming the first transmitting / receiving aperture and the second transmitting / receiving aperture, a configuration shown in FIG. 13 is known (SKOLNIK, “RADAR HANDBOOK”, P1).
6.8 to P16.4).

In FIG. 13, reference numeral 11 denotes an array antenna in which n antenna elements T1 to Tn are arranged in the traveling direction of the mounted machine, and 12 denotes a switch network circuit. When the aperture switching instruction indicates the first transmission / reception aperture, the switch network circuit 12 sets the antenna elements Tj to
Tn is connected to the distributor / synthesizer 13 and the remaining antenna elements T
1 to T (j-1) are connected to the terminators 141 to 14 (j-1) to form a first transmitting / receiving aperture. When the aperture switching instruction indicates the second transmission / reception aperture, the antenna elements T1 to Tk are connected to the distributor / synthesizer 13, and the remaining antenna elements T (k + 1) to Tn are connected to the terminators 14 (k + 1) to 1 (k + 1).
4n to form a second transmitting / receiving aperture.

At the time of transmission, the transmission signal from the transmitter 21 is distributed to k by the distribution / synthesizer 13 via the circulator 22, and the switch / network circuit 12 causes the antenna elements Tj to Tn (first transmission / reception aperture) or T
1 to Tk (second transmitting / receiving aperture) are selectively input and transmitted. The switch network circuit 12 controls switching to the first or second transmission / reception aperture in response to the aperture switching instruction in accordance with the first and second transmission / reception timings.

In reception, the antenna elements Tj to Tn
The received signals received at (the first transmission / reception aperture) or T1 to Tk (the second transmission / reception aperture) are selectively supplied to the distribution / synthesizer 13 by the switch network circuit 12, and the R / R
F is synthesized.

At this time, if the switching to the first transmitting / receiving aperture (antenna element: Tj to Tn) is controlled, the antenna elements T1 to T (j-1) are terminated.
Connected to 1). When switching to the second transmission / reception aperture (antenna elements: 11 to 1k) is performed, the antenna elements T (k + 1) to Tn are connected to the terminators 14 (k + 1) to Tn.
14n.

The signal that has been RF-combined by the distributor / combiner 13 passes through a circulator 22 and is frequency-converted and amplified by a receiver 23. By repeating the first and second transmission / reception, the echo received at the first transmission / reception aperture and the echo received at the second transmission / reception aperture are switched by switching the output port of the switch 24 in accordance with the PRI timing signal. The first and second received signals are D and D, respectively.
It is supplied to the PCA processor 25.

The DPCA processor 25 includes first and second DPCA processors.
The received component (clutter component) from the fixed target is removed by the DPCA processing of the received signal. The received signal thus obtained is displayed on the moving target display device 26.

As described above, in a radar device mounted on an aircraft or the like, DPCA is used as a method of removing a reception echo from a fixed target in order to detect a moving target.
Processing is performed. In the case of an array antenna, as shown in FIG. 13, the first and second transmission and reception are performed while physically switching the antenna aperture to the first and second apertures.

In the method of physically switching the phase center of the antenna aperture as described above, the distance a between the phase centers of the first and second transmission / reception apertures is fixed. Therefore, if the pulse repetition cycle of the radar device is fixed, the flight speed of the aircraft is restricted. Further, even when the pulse repetition period of the radar device is variably controlled, there are restrictions on radar performance such as occurrence of range ambiguity and inability to detect a very low speed target.

[0029]

As described above, in the conventional moving target detecting radar device, the DPCA process is performed by physically switching the phase center of the antenna aperture, so that the flying speed of the mounted mother device is set to a predetermined value. Or the pulse repetition period must be changed for each flight speed in synchronization.

When the flight speed is constant, restrictions are imposed on weather conditions, aircraft conditions, and the like. Further, when the pulse repetition period is made variable, there is a restriction on the radar performance due to a narrow distance range in which range ambiguity does not occur, a deterioration in the target detection performance at a very low speed, and the like.

The present invention has been made in order to solve the above-mentioned problem, and has a fixed pulse repetition period.
It is an object of the present invention to provide a moving target detection radar device that can stably suppress received echoes from a fixed target regardless of the flight speed of a mounted mother machine and can reliably determine the received echoes of a moving target. .

[0032]

In order to solve the above-mentioned problems, a moving target detecting radar apparatus according to the present invention has the following configuration. (1) In a moving target detection radar device for mounting a moving body, at least first, second, and third phases having different phase center positions.
An array antenna having an antenna aperture of
First reception processing means for obtaining a first reception signal in which the position of the phase center is controlled by controlling and adding the amplitudes of the reception signals received by the second antenna aperture; and the second and third reception means.
A second reception processing means for controlling and adding the amplitudes of the reception signals received by the antenna aperture to obtain a second reception signal in which the position of the phase center is controlled; Fixed target component suppressing means for suppressing a radar echo component from a fixed target by delaying one by a transmission pulse repetition time and subtracting from the other received signal is adopted.

(2) In the configuration of (1), the first reception processing means converts a reception signal received by the first and second antenna apertures into a digital signal, and performs an I / Q quadrature detection on an amplitude after the I / Q quadrature detection. The second reception processing means converts the received signals received by the second and third antenna apertures into digital signals, and performs amplitude and phase adjustment after I / Q quadrature detection.

(3) In the configuration of (1), the array antenna has a configuration in which the third antenna aperture is formed so as to include the first and second antenna apertures and is shared as a transmission aperture. I do.

(4) In the configuration of (1), the fixed target component suppressing means determines the first,
It is configured to include a correction unit that corrects the amplitude of at least one of the second received signals to correct the phase center position.

(5) In the configuration of (1), the fixed target component suppressing means determines the first, the second, and the third values based on the speed of the mounted moving body.
A configuration is provided that includes a correction unit that corrects the phase center position of at least one of the first and second reception signals by controlling the amplitude of at least one of the second reception signals.

(6) In the configuration of (1), the fixed target component suppressing means controls the amplitude of at least one of the first and second received signals in accordance with the position of the moving target, so that It is configured to include a correction unit that corrects at least one phase center position of the first and second received signals.

(7) In the configuration of (1), the fixed target component suppressing means controls the amplitude of at least one of the first and second received signals in accordance with the range cell, so that the first and second received signals are suppressed. It is configured to include a correction unit that corrects at least one phase center position of the second reception signal.

(8) In a moving target detection radar device mounted on a moving object, an array antenna having at least first, second, third, and fourth antenna openings having different positions of phase centers, and the first and second antennas are provided. First reception processing means for obtaining and controlling the position of the phase center by controlling and adding the amplitudes of the reception signals received at the second antenna aperture, and the third and fourth antenna apertures Controlling the amplitudes of the received signals received at step 2 and adding them to obtain a second received signal whose phase center position is controlled; and transmitting one of the first and second received signals. A fixed target component suppressing means for suppressing a radar echo component from a fixed target by delaying by a pulse repetition time and subtracting from the other received signal is provided.

(9) In the configuration of (8), the first reception processing means converts a reception signal received at the first and second antenna apertures into a digital signal, and performs an I / Q quadrature detection on the received signal. The second reception processing means converts the reception signals received by the third and fourth antenna apertures into digital signals, and performs amplitude and phase adjustment after I / Q quadrature detection.

(10) In the configuration of (8), the array antenna further forms a fifth antenna opening including the first, second, third and fourth antenna openings,
The moving target detection radar device according to claim 8, wherein the fifth antenna aperture is a transmission aperture.

(11) In the configuration of (8), the fixed target component suppressing means includes a first, a second, and a third, which are arranged in accordance with at least the pulse repetition period of the first and second received signals from the pulse repetition period. And a compensating means for compensating at least one phase center position of the first and second received signals by controlling the amplitude of at least one of the received signals received by the fourth antenna aperture. .

(12) In the configuration of (8), the fixed target component suppressing means is configured to determine the first and second received signals in accordance with at least one of the pulse repetition periods of the first and second received signals from the speed of the mounted moving body. Correction means for correcting at least one phase center position of the first and second received signals by controlling the amplitude of at least one of the received signals received by the second, third and fourth antenna apertures The configuration is provided with.

(13) In the configuration of (8), the fixed target component suppressing means is configured to control the first target in accordance with at least one of the pulse repetition periods of the first and second received signals in accordance with the position of the moving target. Correcting the phase center position of at least one of the first and second received signals by controlling the amplitude of at least one of the received signals received by the second, third, and fourth antenna apertures. Means.

(14) In the configuration of (8), the fixed target component suppressing means is configured to control the first and the second signals in accordance with a range cell.
Controlling the amplitude of at least one of the received signals received by the first, second, third, and fourth antenna apertures in accordance with at least one of the pulse repetition periods of the second received signal; , A correction means for correcting the phase center position of at least one of the second received signals.

(15) In a moving target detection radar device mounted on a moving object, an array antenna having at least first and second antenna openings having different positions of phase centers, and reception by the first and second antenna openings. First reception processing means for obtaining and controlling the position of the phase center by controlling and adding the amplitudes of the received signals thus received, and receiving signals received by the first and second antenna apertures. A second reception process for obtaining a second reception signal controlled at a position of a phase center different from that of the first reception processing unit by controlling and adding to the signal with an amplitude different from that of the first reception processing unit Means for suppressing a target echo component from a fixed target by delaying one of the first and second received signals by a transmission pulse repetition time and subtracting the delayed signal from the other received signal. A configuration having a door.

(16) In the configuration of (15), the first and second reception processing means convert received signals received at the first and second antenna apertures into digital signals, respectively, and The amplitude and phase are controlled after the quadrature detection.

(17) In the configuration of (15), the array antenna further forms a third antenna aperture including the first and second antenna apertures, and the third antenna aperture is defined as a transmission aperture. It is constituted so that.

(18) In the configuration of (15), the fixed target component suppressing means determines the first,
Controlling the amplitude of at least one of the received signals received by the first and second antenna apertures in accordance with at least one of the pulse repetition periods of the second received signal; It is configured to include a correction unit that corrects at least one phase center position of the signal.

(19) In the configuration of (15), the fixed target component suppressing means may determine the first,
Controlling the amplitude of at least one of the received signals received by the first and second antenna apertures in accordance with at least one of the pulse repetition periods of the second received signal; It is configured to include a correction unit that corrects at least one phase center position of the signal.

(20) In the configuration described in (15), the fixed target component suppressing means is configured to control the first target in accordance with at least one of the pulse repetition periods of the first and second received signals in accordance with the position of the moving target. And a correction unit that corrects at least one phase center position of the first and second received signals by controlling the amplitude of at least one of the received signals received by the second antenna aperture. .

(21) In the configuration of (15), the fixed target component suppressing means is configured to control the first and second fixed signals in accordance with the range cell in accordance with at least one of the pulse repetition periods of the first and second received signals. And a correction unit that corrects the phase center position of at least one of the first and second received signals by controlling the amplitude of at least one of the received signals received by the antenna aperture.

[0053]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
An embodiment of the present invention will be described in detail. (First Embodiment) FIG. 1 shows the configuration of a first embodiment of a moving target detecting radar apparatus according to the present invention. In FIG. 1, reference numeral 29 denotes an array antenna, which is configured by arranging antenna elements T1 to Tn.

Transmission pulses repeatedly output from the transmitter 30 are divided into n by the central aperture distributor 31 and supplied to phase shifters (or transmission / reception modules) 331 to 33n via circulators 321 to 32n, respectively. Are given to the space from the antenna elements T1 to Tn.

The received echoes captured by the antenna elements T1 to Tn are supplied to the central aperture combiner 35C via the phase shifters 331 to 33n, the circulators 321 to 32n, and the RF distributors 341 to 34n, respectively. Where R
The F distributors 341 to 34k output the input signal to the left aperture combiner 3
5L, and the RF distributors 34j to 34n distribute the input signal to the right aperture combiner 35R.

The combined outputs of the combiners 35C, 35L, 35R are subjected to frequency conversion and video detection processing by the receivers 36C, 36L, 36R, respectively, and then the amplitude and phase are adjusted by the amplitude and phase adjustment circuits 37C, 37L, 37R. Adjusted.

The received signal output from the amplitude / phase adjusting circuit 37C of the central aperture system is divided into two by a distributor 38, and supplied to adders 39L and 39R, respectively. The reception signal output from the left-opening system amplitude / phase adjustment circuit 37C is supplied to an adder 39L, and the reception signal output from the right-opening system amplitude / phase adjustment circuit 37R is supplied to an adder 39R. It is added to the distribution reception signal of the central aperture system.

The addition output of each of the adders 39L and 39R is DP
After being supplied to the CA processor 40 and removing the echo component from the fixed target by the DPCA process, it is supplied to the moving target display device 41.

The operation of the above configuration will be described below. In the transmission system, the transmission wave generated from the transmitter 30 is distributed to n systems by a central aperture distributor 31 and transmitted to each phase shifter 3 via circulators 321 to 32n.
31 to 33n. After phase control is performed in each of the phase shifters 331 to 33n, the signals are transmitted as radio waves from the antenna elements T1 to Tn.

In the receiving system, when the transmitted wave is reflected by the target and becomes a received echo, and is received by each of the antenna elements T1 to Tn, these received signals are phase-controlled by the phase shifters 331 to 33n. Via the circulators 321 to 32n, two or three distributions are performed by the RF distributors 341 to 34n.

The k RF distributors 3 on the left side of the antenna aperture
The outputs of 41 to 34k are RF-combined by the left aperture combiner 35L, and the k RF distributors 34j to 34j to the right of the antenna aperture are combined.
The output of 34n is RF-combined by the right aperture combiner 35R. The outputs of the n RF distributors 341 to 34n are RF-combined by the central aperture combiner 35C.

The RF-combined reception signals are frequency-converted into IF bands by the receivers 36R, 36L, 36C.
These IF signals are supplied to the amplitude / phase adjustment circuits 37R, 37L, 3
7C.

The amplitude / phase adjusting circuit 37C (37L, 37R)
2 is the same as that of 37C, and is omitted.) FIG. In FIG. 2, the input IF
The signal is converted into a digital signal by an A / D converter 371, subjected to quadrature detection by an I / Q quadrature detection circuit 372, and
The signal is supplied to the complex multiplication circuit 373.

On the other hand, the weight calculation circuit 374 calculates the I / Q complex weight based on the information on the moving speed and the pulse repetition period input from the outside. The I / Q complex weight is supplied to a complex multiplication circuit 373. The complex multiplying circuit 373 multiplies the detected I / Q signal by the input complex weight. Thereby, the amplitude and phase can be adjusted.

In FIG. 1, the signal of the central aperture system is divided into two signals by a distributor 38. The signals received at the left and center openings and the signals received at the right and center openings are added by adders 39L and 39R, respectively.

As described above, the position of the phase center can be controlled by adjusting the amplitude and phase of the combined signals of the left opening and the center opening having different opening lengths and adding them. The same applies to the right opening and the center opening. The composite signal of the left and right apertures whose phase centers are controlled is DP
It is input to the CA processor 40.

FIG. 3 shows a specific configuration of the DPCA processor 40.
Shown in In FIG. 3, the received signal synthesized by the right opening and the center opening is delayed by a pulse repetition period (T1) by a PRI delay circuit 401 and supplied to a phase correction circuit 402.

On the other hand, the phase correction amount calculation circuit 402 obtains a phase shift amount corresponding to the moving distance of the antenna aperture in the beam scanning direction from the beam scanning angle and the moving speed information input from the outside. A phase correction signal for correcting the shift amount is generated. This phase correction signal is supplied to the phase correction circuit 402.

The phase correction circuit 402 corrects the phase of the received signal based on the phase correction signal, so that the frequency shift component of the Doppler frequency distribution due to the movement of the antenna aperture in the beam scanning direction can be removed.

Further, the subtraction circuit 404 performs a subtraction process on this signal and the received signal synthesized at the left opening and the center opening. Thereby, the frequency component of the reception echo of the fixed target can be suppressed, and the reception echo of the moving target can be extracted and displayed by the moving target display device 41.

As described above, in the present embodiment, the transmission aperture shown in FIG. 12 is constituted by the antenna elements T1 to Tn connected to the central aperture distributor 31. The first receiving aperture is configured by antenna elements T1 to Tn connected to the central aperture combiner 35C and antenna elements Tj to Tn connected to the right aperture combiner 35R. Further, the second receiving aperture is connected to the antenna elements T1 to Tn connected to the central aperture combiner 35C and the left aperture combiner 35L.
Are connected to the antenna elements T1 to Tk.

The phase and amplitude adjusting circuits 37C, 37R, 3
Another specific example of 7L is shown in FIG. In FIG. 4, the same parts as those in FIG. 2 are denoted by the same reference numerals, and different parts will be described here.

In the above description of FIG. 12 and the expression (2), the case where the radar platform moves by the distance d between transmission and reception has been described. The configuration example in FIG. 4 is a means for correcting this.

In FIG. 4, the input IF signal is A /
The signal is converted into a digital signal by the D converter 371, and the I / Q signal is detected by the I / Q quadrature detection circuit 372. Further, the weight calculation circuit 374 calculates an I / Q complex weight based on the moving speed information input from the outside (the above is the description of FIG. 2).
Same as).

On the other hand, the weight correction table 376 contains
Correction weights for correcting the distance d shifted in accordance with the target distance calculated in advance are stored, and when distance information is given from the outside, the weight correction table 376 corresponds to the distance. Select and output the correction weight.

This correction weight is output from the complex multiplication circuit 375
And is multiplied by the complex weight calculated by the weight calculation circuit. As a result, the complex weight obtained by correcting the distance d is input to the complex multiplication circuit 373.

The complex multiplication circuit 373 detects the detected I / Q
The signal is multiplied by the input complex weight to perform amplitude / phase control and output. This makes it possible to suppress the reception echo from the fixed target with high accuracy without depending on the distance between the radar device and the target.

(Second Embodiment) FIG. 5 shows the configuration of a moving target detection radar device according to a second embodiment of the present invention. In FIG. 5, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the duplicate description will be omitted.

The radar apparatus shown in FIG. 5 is characterized in that it has a first left-opening combiner 35L1 and a second left-opening combiner 35L2 for left-side opening, and a first right-opening combiner 35L2 for right-side opening. Unit 35R1 and second right opening synthesizer 3
5R2 and the central aperture synthesizer is eliminated.

That is, in the transmission system, the transmission wave generated from the transmitter 30 is distributed to n systems by the central aperture distributor 31 and input to the phase shifters 331 to 33n via the circulators 321 to 32n. And each phase shifter 331
３３33n, and then the antenna elements T1 to T
n and transmitted as radio waves.

In the receiving system, when a transmission wave is reflected by a target and becomes a reception echo and is received by each of the antenna elements T1 to Tn, these reception signals are phase-controlled by phase shifters 331 to 33n, Through the circulators 321 to 32n, RF signals are distributed to RF distributors 341 to 34n by two, three, or four.

Among the distributed outputs of the RF distributors 341 to 34n, k outputs (341 to 34k) on the left side of the antenna aperture are RF-combined by the first left aperture combiner 35L1, and similarly, m output ports on the left side The outputs of (341 to 34m) are RF-combined in the second left-aperture combiner 35L2.

Further, k pieces (34j) on the right side of the antenna aperture
To 34n) are output to the first right aperture synthesizer 35R1 by RF.
The m outputs (34i to 34n) on the right side are similarly RF-combined by the second right aperture combiner 35R2.

Each of the RF-combined reception signals is frequency-converted into IF signals by receivers 36L1, 36L2, 36R1 and 36R2.
7L1, 37L2, 37R1, and 37R2.
Amplitude / phase adjusting circuits 37L1, 37L2, 37R1, 37
Since the circuit configuration of R2 is the same as that shown in FIG.
Here, the description is omitted.

The first left opening side amplitude / phase adjusting circuit 37L1
The two synthesized signals output from the amplitude phase adjustment circuit 37L2 on the second left aperture side are added by an adder 39L (hereinafter, the added signal is referred to as a left synthesized signal). Similarly, the two signals synthesized by the first right opening side amplitude / phase adjustment circuit 37R1 and the second right opening side amplitude / phase adjustment circuit 37R2 are also added by the adder 39R (hereinafter, the added signal is right-shifted). A composite signal).

As described above, the position of the phase center can be controlled by adjusting the amplitude and phase of the combined signals of the first left opening and the second left opening having different opening lengths and adding them. The same applies to the first right opening and the second right opening. The left synthesized signal and the right synthesized signal whose phase centers are controlled are DP
It is input to the CA processor 40.

Since the configuration of this DPCA processor 40 is the same as that shown in FIG. 3, its description is omitted here. Since the frequency component of the reception echo of the fixed target is sufficiently suppressed in the DPCA processor 40, the moving target display device 4
1 allows the reception echo of the moving target to be extracted and displayed.

As described above, in the present embodiment, the transmitting aperture shown in FIG. 12 is formed by the antenna elements T1 to Tn connected to the central aperture distributor 31, and the first receiving aperture is formed by the first right aperture combiner. Antenna elements Tj to Tn, Ti to Tn connected to 35R1 and second right aperture combiner 35R2, respectively.
And the second receiving aperture is the first left aperture combiner 35
L1 and the antenna elements T1 to Tk and T1 to Tm connected to the second left aperture combiner 35L2.

The feature of the embodiment shown in FIG. 5 is that a receiving system uses four openings (first left opening, second left opening, first right opening, and second right opening) having different positions of the phase center. There is in the point. The positions of the phase centers in the left synthesized signal and the right synthesized signal are controlled using the received signals from two apertures each having a different phase center. The effect of this will be described later.

(Third Embodiment) FIG. 6 shows the configuration of a moving target detection radar apparatus according to a third embodiment of the present invention. In FIG. 6, the same parts as those in FIG. 1 are denoted by the same reference numerals, and duplicate description will be omitted.

The characteristic feature of the radar apparatus shown in FIG. 6 is that the RF distributors 341 to 34n have two distribution outputs, and the distribution outputs of the k RF distributors 341 to 34k on the left are input to the left aperture combiner 35L. In addition, one of the output terminals of the other RF distributors 34 (k + 1) to 34n is connected to the terminator 42.
The termination processing is performed at (k + 1) to 42n, and the distribution outputs of the k right RF distributors 34j to 34n are input to the left aperture combiner 35R, and the other RF distributors 341 to 34 (j-1).
Is terminated by terminators 421 to 42 (j-1), the central aperture combiner is eliminated, and the switch 43 can switch the reception aperture.

That is, in the transmission system, a transmission wave generated from the transmitter 30 is distributed to n systems by the central aperture distributor 31 and input to the phase shifters 331 to 33n via the circulators 321 to 32n. And each phase shifter 331
３３33n, and then the antenna elements T1 to T
n and transmitted as radio waves.

In the receiving system, when the transmission wave is reflected by the target and becomes a reception echo and is received by each of the antenna elements T1 to Tn, these reception signals are phase-controlled by the phase shifters 331 to 33n, Via the circulators 321 to 32n, they are divided into two by the RF distributors 341 to 34n.

Among the distributed outputs of the RF distributors 341 to 34n, k distributed outputs (341 to 34k) on the left side of the antenna aperture are RF-combined by the left aperture combiner 35L. The k (34j to 34n) distributed outputs on the right side of the antenna aperture are RF-combined by the right aperture combiner 35R.

Each of the RF-combined reception signals is frequency-converted into an IF signal by receivers 36L and 36R, and then input to amplitude and phase adjustment circuits 37L and 37R. The circuit configuration of these amplitude and phase adjustment circuits 37L and 37R is the same as that shown in FIG. 2, and the description thereof is omitted here.

The two signals synthesized and adjusted in amplitude and phase on the left opening side and the right opening side are added by an adder 39.
Thus, by adjusting the amplitude and phase of the combined signals of the left opening and the right opening having different opening lengths and adding them, the position of the phase center can be controlled. The composite signal whose phase center is controlled is input to the switch 43. The switch 43 switches and outputs the combined input in accordance with the PRI timing signal from the outside, thereby separating it into a first received signal and a second received signal. These received signals are input to the DPCA processor 40.

Since the configuration of this DPCA processor 40 is the same as that shown in FIG. 3, its description is omitted here. Since the frequency component of the reception echo of the fixed target is sufficiently suppressed in the DPCA processor 40, the moving target display device 4
1 allows the reception echo of the moving target to be extracted and displayed.

As described above, in the present embodiment, FIG.
The transmission aperture shown in FIG. 3 is composed of antenna elements T1 to Tn connected to the central aperture distributor 31, and the first reception aperture is composed of antenna elements Tj connected to the right aperture combiner 35R and the left aperture combiner 35L, respectively. ~ Tn, T1 ~ Tk,
Similarly, the second receiving aperture also includes antenna elements Tj to Tn, connected to the right aperture combiner 35R and the left aperture combiner 35L.
It is composed of T1 to Tk.

The feature of the embodiment shown in FIG. 6 resides in that all the circuit configurations of the receiving system for forming the first received signal and the receiving system for forming the second received signal can be shared, and the circuit scale is reduced. It is in.

(Other Embodiments) In the above embodiments, the case of a one-dimensional array has been described, but a two-dimensional array can be similarly configured. In the case of a two-dimensional array, for example, the phase of a signal received by an antenna element arranged in a plane is controlled by a phase shifter, and a direction orthogonal to the moving direction of the radar platform (for example, moving in a lateral direction). After performing RF synthesis in the vertical direction in the case of an airborne aircraft, DPCA processing may be performed by the above-described method. Further, the antenna aperture does not need to have a planar shape, and can be realized with any shape.

In the above embodiment, an example of a passive type phased array in which phase shifters are arranged has been described. However, if a transmitting / receiving module having a power amplifier is used instead of a phase shifter, an active type phased array may be used. But you can.

In the embodiment shown in FIG. 5, two apertures having different phase centers are used in order to obtain a left synthesized signal and a right synthesized signal. However, the present invention does not necessarily require two apertures. The apertures having different phase centers may be amplitude-phase controlled and added.

Further, in the above embodiment, the example of the monostatic type radar in which the transmission system and the reception system are formed by the same radar (the same antenna aperture) is shown. It can be applied to types.

(Embodiment) In the present invention, a signal obtained by adjusting the amplitude and phase of signals having different phase centers synthesized by two different synthesizers and adding the signals is as if the phase center of the two signals described above was obtained. The fact that a phase center is provided at a position different from the above is used.

Here, the phase control performed by the amplitude / phase adjusting circuit is mainly intended to correct a phase error between two synthesized signals synthesized by different synthesizers. The amplitude control has the effect of correcting the amplitude error between two synthesized signals synthesized by different synthesizers, and also has the effect of making the phase center variable in the present invention.

FIG. 7 shows that, in the first embodiment shown in FIG. 1, the combined signals having different positions of the phase centers combined by different combiners are subjected to amplitude control and then added.
The operation of forming a composite signal different from the phase center position of one composite signal is shown.

In FIG. 7A, the left aperture (phase center position:
3 shows an example of the amplitude weight amplitude distribution of each aperture in an antenna formed with three apertures having different aperture lengths of L _P ), a central aperture (phase center position: C _P ), and a right aperture (phase center position: R _P ). ing.

Here, a brief operation outline of the phase center will be described. In the amplitude distribution of the amplitude weights shown in FIG. 7A, considering the horizontal axis as the position of the physical antenna element and the vertical axis as the amplitude intensity, the phase center is formed near a position that is symmetric with respect to the phase center. Is done.

FIG. 1 shows a configuration example of a radar apparatus having the characteristics shown in FIG. 7A.
First, the amplitude weight (L1) of the left aperture in FIG. 7A will be described. In FIG.
The reception signal received at Tn is weighted and synthesized by the left aperture synthesizer 35L according to the curve L1 in FIG. 10A. The amplitude and phase adjustment circuit 37L outputs the synthesized signal as 1
/ K times. As a result, the amplitude weight of the left opening is L2
Is equivalent to a signal synthesized according to the curve

Similarly, the amplitude weight (R1) of the right aperture will be described. In FIG.
Through the right aperture synthesizer 35R.
In accordance with the curve R1 in FIG. The amplitude and phase adjustment circuit 37R multiplies the combined signal by 1 / K. As a result, the amplitude distribution of the right opening is changed as shown in FIG.
It is equivalent to a signal synthesized according to the curve R2 in (a).

Further, the amplitude weight of the central opening (C1)
In FIG. 1, each antenna element T
The received signals received at 1 to Tn are combined with the central aperture combiner 35.
At C, the images are weighted and combined according to the curve C1 in FIG. Hereinafter, this synthesized signal is converted to an amplitude / phase adjustment circuit 37C.
Let's consider the case of equal magnification (1 time).

Here, in FIG. 7B, the amplitude weight of the left synthesized signal obtained by adding the signals synthesized by the left opening and the center opening shown in FIG. 7A after the amplitude adjustment, and the right opening and the center opening, respectively. 5 shows the amplitude distribution of the amplitude weight of the right synthesized signal obtained by adding the synthesized signals after the amplitude adjustment.

First, when K = 1, that is, when the amplitude control is not performed by the amplitude and phase adjustment circuits 37L and 37C, the amplitude weight of each antenna element in the left synthesized signal is L1 + C1, which is represented by a curve L1 'in FIG. 7B. The distribution is as shown. The position of the phase center at this time is indicated by LP1. Similarly, the amplitude weight of each antenna element in the right synthesized signal is R1 +
C1 and a distribution as shown by a curve R1 ′ in FIG. 7B. The position of the phase center at this time is indicated by RP1. These phase center distances L _{P1 to} R _P1 are referred to as a1.

Next, when the amplitudes of the left aperture and the right aperture are controlled to 1 / K times by the amplitude / phase adjustment circuits 37L and 37R, the amplitude weight of each antenna element in the left synthesized signal is L2 + C1, and FIG. Curve L in (b)
The distribution is as shown by 2 '. The position of the phase center at this time is indicated by _LP2 . Similarly, the amplitude weight of each antenna element in the right synthesized signal is R2 + C1, and has a distribution as shown by a curve R2 'in FIG. 7B. The position of the phase center at this time is indicated by R _P2 . These phase center distances L _{P2 to} R _P2
Is set to a2.

As described above, as shown in FIG. 7B, the phase center is formed in the vicinity of a position which is bilaterally symmetrical with respect to the phase center in the amplitude distribution of the amplitude weight, so that K> 1. In the case of, a1> a2, and conversely, in the case of K <1, a1 <a2.

As described above, when signals having different phase centers combined by two different combiners are amplitude controlled and added, the position of the phase center of the added signal fluctuates according to the amplitude value. DPCA to detect moving targets
In the case of performing the processing, the difference a between the phase center position when receiving the first reception signal and the phase center position when receiving the second reception signal can be changed according to the speed of the radar platform. Therefore, it is possible to satisfactorily remove the received echo from the fixed target regardless of the flight speed of the aircraft.

[0117] Figure 7 is a first array antenna configuration embodiments are mentioned as examples, the variable range of a spacing between the phase centers of the left opening and a right opening of FIG. 1 (L _P ~R _P) A
If 0 (see FIG. 12A), 0 ≦ a ≦ a0. From the equation (1), the maximum value (a0) of the variable range may be a0 ≧ 2vmax · T1 from the maximum moving speed vmax of the radar platform and the pulse repetition period T1.

However, in order to increase a0, the distance between the center of the phase between the center opening and the left opening and the center of the phase between the center opening and the right opening (L _P
If -C _P and C _P to R _P) too takes large may strain amplitude weights to form the left composite signal and a right composite signal, characteristic deterioration such as the side lobe level of the antenna pattern is increased occurs .

FIG. 7C shows this state. here,
And amplitude weights in the left aperture (phase center position L _P) (curve L1), an amplitude weighting in the central opening (phase center position C _P) (curve C1), the amplitude weights when these synthesized (phase center position L _P1 , Curve L1 ′). That is, when the phase distance between the centers of the central opening and left opening (L _P ~C _P) is large, a shape distorted amplitude weights L1 'as in this Figure.

FIG. 8 shows an amplitude distribution of amplitude weights in the second embodiment shown in FIG. Let L be the phase center position of the amplitude weight (curve L1) of the first left aperture (1).
_P and the amplitude weight of the second left opening (2) (curve L
_Assuming that the phase center position of 1 ″) is L _P2 , the amplitude weight of the left synthesized signal obtained by adding the synthesized signals of the first left opening and the second left opening is as indicated by a curve L1 ′. In this case, In order to make the phase center position _LP1 of the left synthesized signal variable, the amplitudes of the first left opening and the second left opening may be controlled.

Similarly, the phase center position of the amplitude weight (curve R1) of the first right opening (1) is set to R _P, and the phase center position of the amplitude weight (curve R1 ″) of the second right opening (2) is set to R _{P. Assuming} that _P2 , the amplitude weight of the right synthesized signal obtained by adding the respective synthesized signals of the first right opening and the second right opening is as shown by a curve R1'.The phase center position RP1 of the right synthesized signal is made variable. In this case, the amplitudes of the first right opening and the second right opening may be controlled.

By the way, if the interval between the phase centers of the first left aperture and the first right aperture is a0, and the interval between the phase centers of the second left aperture and the second right aperture is a3, the phase center of the left composite signal and the right composite are obtained. The variable range a of the interval between the signal phase centers is a3 ≦ a ≦ a0
Is obtained.

The maximum value (a0) and the minimum value (a
In 3), a0 ≧ 2vmax · T1 a3 ≦ 2Vmin · T1 from the maximum moving speed vmax and the minimum moving speed vmin of the platform and the pulse repetition period T1.

Generally, the flight speed range required for an aircraft is limited, but if the range is narrow, a0 and a3
Can be reduced. That is, since the distance (L _{P to} L _P2 ) between the center of each of the first left opening and the second left opening can be reduced, the amplitude weight formed by the left synthesized signal includes:
The distortion as shown in FIG. 7C does not easily occur, and the characteristic deterioration such as the increase in the side lobe level in the antenna pattern hardly occurs. The same applies to the right synthesized signal.

FIG. 9 shows the amplitude distribution of the amplitude weights in the embodiment of FIG. The phase center position of the amplitude weights of the left aperture (curve L1) and L _P, to obtain a phase center of the right aperture amplitude weights (curve R1) When R _P, the addition of each of the composite signal of the left opening and a right opening The amplitude weight of the synthesized signal obtained is as shown by a curve L1 '.

By controlling the amplitude of the left aperture and the amplitude of the right aperture with different amplitude values when receiving the first received signal and the second received signal, the phase center position LP1 of the composite signal can be varied. can do. Here, assuming that the interval between the phase centers of the left opening and the right opening is a0, the variable range a of the interval between the phase centers of the first and second received signals is 0 ≦ a ≦ a.
It becomes 0.

Next, the amplitude / phase adjusting circuit 37 shown in FIG.
The operation in C will be described. First, the moving distance d of the radar apparatus between transmission and reception shown in FIG. 12 is expressed by the following equation. d = t1 · v = (2R / C) · v (4) In equation (4), C is the speed of light, R is the distance from the radar device to the target, and R〓I _T 〓I _R (〓 is Represents approximation)
it is conceivable that.

The phase center interval between the transmission aperture and the first reception aperture in the first transmission / reception is (b + d), and the phase center interval between the transmission aperture and the second reception aperture in the second transmission / reception is (c−d). d). Therefore, the required phase center interval differs depending on the target distance. As shown in FIG. 4, by making the complex weight by which the signal received at each aperture is multiplied variable according to the target distance,
The position control of the phase center according to the target distance can be easily performed.

Here, as the target distance information, if the position of the target can be estimated in advance, the information may be used. However, if the position of the target is not known, the distance from the moment when the transmission wave is transmitted is used. The distance may be obtained, and the correction weight may be updated sequentially during the reception period. The distance information based on the elapsed time is represented by P used in signal processing of the radar device.
It can be easily calculated by using the RI timing signal and the reference clock.

[0130]

As described above, according to the present invention, it is possible to stably suppress received echoes from a fixed target irrespective of the flight speed of the mounted mother machine while keeping the pulse repetition period fixed. It is possible to provide a moving target detection radar device that can determine a reception echo of a moving target.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a moving target detection radar device according to the present invention.

FIG. 2 is a block diagram showing a specific configuration example of an amplitude and phase adjustment circuit which is a main component of the embodiment shown in FIG. 1;

FIG. 3 is a main component of the embodiment shown in FIG. 1;
FIG. 2 is a block diagram showing a specific configuration example of an A processor.

FIG. 4 is a main component of the embodiment shown in FIG. 1;
FIG. 6 is a block diagram showing another specific configuration example of the A processor.

FIG. 5 is a block diagram showing a configuration of a moving target detection radar device according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a moving target detection radar device according to a third embodiment of the present invention.

FIG. 7 is an amplitude distribution diagram for explaining adaptive DPCA in the first embodiment shown in FIG. 1;

FIG. 8 is an amplitude distribution diagram for explaining the operation of the adaptive DPCA in the second embodiment shown in FIG. 5;

FIG. 9 is an amplitude distribution diagram for explaining the operation of the adaptive DPCA according to the third embodiment shown in FIG. 6;

FIG. 10 is a timing waveform chart showing transmission and reception timings in a general radar device.

FIG. 11D when the radar platform moves
FIG. 7 is a conceptual diagram showing an operation in the PCA process in a case where the antenna has two apertures of a first transmission / reception aperture and a second transmission / reception aperture.

FIG. 12 is a conceptual diagram showing a case where there are three antenna apertures, a transmission aperture, a first reception aperture, and a second reception aperture as an application example of FIG. 11;

FIG. 13 is a block diagram showing a configuration of a conventional moving target detection radar device mounted on a moving object.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Array antenna T1-Tn ... Antenna element 12 ... Switch network circuit 13 ... Divider / combiner 141-14n ... Terminator 21 ... Transmitter 22 ... Circulator 23 ... Receiver 24 ... Switch 25 ... DPCA processor 26 ... Moving Target display device 29 Array antenna 30 Transmitter 31 Central aperture splitter 321 to 32n Circulator 331 to 33n Phase shifter (or transmission / reception module) 341 to 34n RF distributor 35C Central aperture combiner 35L , 35L1, 35L2... Left aperture synthesizer 35R, 35R1, 35R2... Right aperture synthesizer 36C, 36L, 36R... Receiver 36L1, 36L2, 36R1, 36R2. , 37L2, 37R1, 37R2... Amplitude / phase adjusting circuit 71 A / D converter 372 I / Q quadrature detection circuit 373 Complex multiplication circuit 374 Weight calculation circuit 375 Complex multiplication circuit 38 Distributors 39, 39L, 39R Adder 40 DPCA processor 401 PRI Delay circuit 402 ... Phase correction circuit 403 ... Phase correction amount calculation circuit 404 ... Subtraction circuit 41 ... Moving target display device 421-42 (j-1) ... Terminal 42 (k + 1) -42n ... Terminal 43 ... Switch

Claims (21)

[Claims] 1. A moving target detection radar device for mounting on a moving body, comprising: an array antenna having at least first, second, and third antenna openings having different phase center positions; and the first and second antenna openings. First reception processing means for obtaining a first reception signal in which the position of the phase center is controlled by controlling and adding the amplitudes of the reception signals received; and reception reception at the second and third antenna apertures. Second reception processing means for obtaining a second reception signal whose phase center position is controlled by controlling and adding signal amplitudes; and delaying one of the first and second reception signals by a transmission pulse repetition time. And subtracting it from the other received signal,
A moving target detection radar device comprising: fixed target component suppressing means for suppressing a radar echo component from a fixed target. 2. The first reception processing means converts a reception signal received by the first and second antenna apertures into a digital signal, and performs amplitude and phase adjustment after I / Q quadrature detection. Converts the received signal received by the second and third antenna apertures into a digital signal,
The moving target detection radar apparatus according to claim 1, wherein amplitude and phase are adjusted after / Q quadrature detection. 3. The array antenna according to claim 1, wherein the third antenna aperture is formed so that the first and second antenna apertures are included, and is shared as a transmission aperture. Moving target detection radar device. 4. The fixed target component suppressing means receives at the first, second, and third antenna apertures according to at least one of the first and second received signal pulse repetition periods from the pulse repetition period. 2. The moving target according to claim 1, further comprising a correction unit configured to correct at least one phase center position of the first and second received signals by controlling at least one amplitude of the received signals. Detection radar device. 5. The fixed target component suppressing means according to claim 1, wherein said first, second, and third antenna apertures are determined according to a pulse repetition period of at least one of said first and second received signals based on a speed of said mounted moving body. 2. The apparatus according to claim 1, further comprising a correction unit configured to control at least one amplitude of the reception signals received in step (a) to correct at least one phase center position of the first and second reception signals. Moving target detection radar device. 6. The fixed target component suppressing means according to a position of a moving target, a first, a second, and a third antenna according to a pulse repetition cycle of at least one of the first and second received signals. 2. The apparatus according to claim 1, further comprising a correction unit configured to correct at least one phase center position of the first and second reception signals by controlling an amplitude of at least one of the reception signals received by the aperture. A moving target detection radar device according to claim 1. 7. The fixed target component suppressing means according to a range cell, adjusts the amplitude of at least one of the first and second received signals according to a pulse repetition period.
And a control unit that controls at least one of the received signals received by the antenna aperture to correct at least one phase center position of the first and second received signals. Item 4. A moving target detection radar device according to item 1. 8. A moving target detecting radar apparatus for mounting on a moving body, comprising: an array antenna having at least first, second, third and fourth antenna openings having different positions of phase centers; and the first and second antennas. A first reception processing means for controlling and adding the amplitudes of the reception signals received by the antenna apertures to obtain a first reception signal in which the position of the phase center is controlled; and the third and fourth antenna apertures Second reception processing means for obtaining a second reception signal in which the position of the phase center is controlled by controlling and adding the amplitude of the received reception signal; and transmitting one of the first and second reception signals to a transmission pulse. By delaying by the repetition time and subtracting from the other received signal,
A moving target detection radar device comprising: fixed target component suppressing means for suppressing a radar echo component from a fixed target. 9. The first reception processing means converts a reception signal received by the first and second antenna apertures into a digital signal, and adjusts the amplitude and phase after I / Q quadrature detection. Converts the received signal received by the third and fourth antenna apertures into a digital signal,
9. The moving target detection radar device according to claim 8, wherein amplitude and phase are adjusted after / Q quadrature detection. 10. The fifth array antenna further comprising the first, second, third and fourth antenna apertures.
9. The moving target detection radar device according to claim 8, wherein the antenna aperture is formed as a transmission aperture. 11. The fixed target component suppressing means according to claim 1, wherein at least one of the first and second received signals has a pulse repetition period from a pulse repetition period.
By controlling the amplitude of at least one of the received signals received at the fourth antenna aperture, the first and second signals are controlled.
9. The moving target detection radar device according to claim 8, further comprising a correction unit that corrects at least one phase center position of the received signal. 12. The fixed target component suppressing means according to a pulse repetition period of at least one of the first and second received signals based on the speed of the mounted moving body.
By controlling the amplitude of at least one of the received signals received at the fourth antenna aperture, the first and second signals are controlled.
9. The moving target detection radar device according to claim 8, further comprising a correction unit that corrects at least one phase center position of the received signal. 13. The fixed target component suppressing means according to a position of a moving target, a first, a second, a third, and a second signal in accordance with at least one pulse repetition period of the first and second received signals. 4 by controlling the amplitude of at least one of the received signals received by the antenna aperture of the first and fourth antennas.
9. The moving target detection radar device according to claim 8, further comprising a correction unit configured to correct at least one phase center position of the second reception signal. 14. The fixed target component suppressing means according to a range cell, a first, second, third, or fourth antenna according to a pulse repetition period of at least one of the first and second received signals. 9. A correction means for correcting at least one phase center position of the first and second received signals by controlling the amplitude of at least one of the received signals received by the aperture. A moving target detection radar device according to claim 1. 15. A moving target detection radar device for mounting on a moving body, comprising: an array antenna having at least first and second antenna apertures having different positions of phase centers; and an antenna received by the first and second antenna apertures. First reception processing means for controlling and adding the amplitudes of the received signals to obtain a first received signal whose phase center position is controlled, and a received signal received by the first and second antenna apertures. A second reception processing means for obtaining a second reception signal controlled at a position of a phase center different from that of the first reception processing means by controlling and adding with an amplitude different from that of the first reception processing means By delaying one of the first and second received signals by the transmission pulse repetition time and subtracting the other from the other received signal,
A moving target detection radar device comprising: fixed target component suppressing means for suppressing a radar echo component from a fixed target. 16. The first and second reception processing means convert received signals received by the first and second antenna apertures into digital signals, respectively, and perform amplitude and phase control after I / Q quadrature detection. The moving target detecting radar device according to claim 15, wherein: 17. The device according to claim 17, wherein the array antenna further includes the first antenna.
16. The moving target detection radar device according to claim 15, wherein a third antenna opening including the first antenna opening and the second antenna opening is formed, and the third antenna opening is used as a transmission opening. 18. The fixed target component suppressing means according to claim 1, wherein said received signal received by said first and second antenna apertures in accordance with at least one of said first and second received signal repetition periods from a pulse repetition period. 16. The moving target detection radar device according to claim 15, further comprising a correction unit that corrects at least one of the first and second received signals to correct the phase center position by controlling at least one of the amplitudes. . 19. The fixed target component suppressing means receives at the first and second antenna apertures according to at least one of the pulse repetition periods of the first and second received signals based on the speed of the mounted moving body. 16. The moving target according to claim 15, further comprising: a correction unit configured to correct at least one phase center position of the first and second received signals by controlling at least one amplitude of the received signals. Detection radar device. 20. The fixed target component suppressing means receives at a first and second antenna aperture according to a pulse repetition period of at least one of the first and second received signals according to a position of a moving target. 16. The moving device according to claim 15, further comprising a correction unit configured to control at least one of the received signals to correct at least one phase center position of the first and second received signals. Target detection radar device. 21. The fixed target component suppressing means according to a range cell, a reception signal received at a first or second antenna aperture according to at least one pulse repetition period of the first and second reception signals. 16. The moving target detection radar according to claim 15, further comprising a correction unit configured to correct at least one phase center position of the first and second received signals by controlling an amplitude of at least one of the signals. apparatus.