JP2001108741A - Device and method for transmission and reception - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate difficulty in using an interfering radio wave as the radio wave for a radar. SOLUTION: A transmission signal by a transmitter 2 is transmitted from a transmission antenna 1 as a radio, wave, and the radio wave reflected by a target is received by receiving antennas 3-1 to 3-N. The received signals are processed by plural signal processing circuits 4-1 to 4-N different in received signal frequency bands, the signals after processed are incoherence-intergated by an incoherent integration circuit 6, and a target detecting circuit 7 determines detection of a target based on the signal processed hereinbefore. The incoherent integration and the detection of the target are determined by the same Doppler cell corresponding to Doppler cell corresponding relation among the respective signal processing circuits 4-1 to 4-N by a Doppler compensation circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting / receiving apparatus and a transmitting / receiving method for detecting a radio wave reflected by a target and received by an antenna from radio waves transmitted in a predetermined frequency band and using the detected radio wave as a radar. .

[0002]

2. Description of the Related Art FIG. 10 is a block diagram showing a conventional transmitting / receiving apparatus. In the figure, reference numeral 101 denotes a transmission antenna for transmitting a transmission signal generated by a transmitter 102 as a radio wave, and 102 generates a transmission signal in a predetermined wide frequency band for the purpose of interfering with a radar function of a target such as an aircraft. Transmitter. Reference numeral 103 denotes a transmission antenna for transmitting the transmission signal generated by the radar transmitter 104 as a radio wave, and reference numeral 104 denotes a radar transmitter for generating a transmission signal in a predetermined narrow frequency band for the purpose of measuring a target position.

[0005] A receiving antenna 105 receives a radio wave, and a signal processing circuit 106 includes a receiver 111, an A / D converter 112, a coherent integration circuit 113, and a detection circuit 114 and processes a received signal. . In the signal processing circuit 106, a receiver 111 performs band detection on the signal received by the receiving antenna 105 by band-limiting the signal to a frequency band of a signal transmitted by the radar transmitter 104, and 112 performs processing by the receiver 111. A / D converter for converting an analog signal into a digital signal.
Reference numeral 3 denotes a coherent integration circuit that performs coherent integration of the signal from the A / D converter 112 at predetermined time intervals. Reference numeral 114 denotes a detection circuit that performs amplitude detection or square detection of the coherently integrated signal.

Reference numeral 107 denotes an incoherent integration circuit for performing incoherent integration on the output of the signal processing circuit 106, that is, the output signal of the detection circuit 114 to improve the target detection probability. A target detection circuit that compares the power of the coherently integrated signal with a predetermined threshold, determines a signal component equal to or higher than the threshold as a target signal component, and outputs the target signal component.

FIG. 11 shows, for example, “Airborne Pu”.
lsed Doppler Radar "(Morri
by Harness, Arthouse
FIG. 3 is a block diagram showing a configuration of a receiver in a conventional transmission / reception device described on page 317 of Publishers (1996). In the figure, reference numeral 121 denotes a phase shifter that shifts the phase of the same signal as the transmission signal generated by the radar transmitter 104 by 90 degrees, and 122 denotes the same as the transmission signal generated by the radar transmitter 104. Is multiplied by the received signal received by the receiving antenna 105, and the resulting signal is supplied to the low-pass filter 123-1 as an I (In-phase) signal. The signal whose phase has been shifted is multiplied by the received signal received by the receiving antenna 105, and the signal of the operation result is Q (Quadratur).
e) A mixer for supplying a signal to the low-pass filter 123-2, and a low-pass filter 123-1 for passing only a predetermined low-frequency band component of the I signal from the mixer 122. 2 is Q from mixer 122
This is a low-pass filter that passes only a predetermined low-frequency band component of the signal.

Next, the operation will be described. Transmitter 102
Generates a transmission signal for the purpose of paralyzing the target radar function, and transmits the signal as a radio wave to the target by the transmission antenna 101. At this time, the transmitter 102 generates a transmission signal having a required bandwidth. In the target, in addition to the signal transmitted from the target and reflected on a mobile body equipped with the present apparatus, the transmitted signal transmitted by the transmitting antenna 101 is simultaneously received, so that the reflected signal is buried in the transmitted signal, and The radar function is paralyzed.

[0007] The radar transmitter 104 includes the transmitter 10.
A transmission signal is generated in a frequency band different from the frequency band of the transmission signal generated in Step 2 and transmitted as a radio wave via the transmission antenna 103 for a target distance measurement or the like.
The frequency band of the signal transmitted by the radar transmitter 104 is
Generally, the frequency band is set narrower than the frequency band of the signal transmitted by the transmitter 102.

Then, transmitted from the transmitting antenna 103,
The radio wave reflected on the target is received by the receiving antenna 105. The signal received by the receiving antenna 105 is supplied to the receiver 111 of the signal processing circuit 106. Generally, the receiver 111 superimposes receiver noise on the received signal.

In the receiver 111, a mixer 122,
By the low-pass filters 123-1 and 123-2, etc.
The received signal in a predetermined frequency band is phase-detected based on the frequency of the signal transmitted by the radar transmitter 104 and supplied to the A / D converter 112 as an I signal and a Q signal. That is, the mixer 122 multiplies the received signal by a signal S1 (t) identical to the signal transmitted from the radar transmitter 104 and a signal S2 (t) whose phase is advanced by 90 degrees from the signal S1 (t), and Signal and Q signal, and a low-pass filter 1
The band is limited by 23-1 and 123-2.

[0010] The A / D converter 112 converts the supplied I signal and Q signal (analog signal) into a digital signal and supplies the digital signal to the coherent integration circuit 113. The coherent integration circuit 113 samples the supplied signal at a predetermined time interval, holds a predetermined number of sample values, and stores the sampled value for a predetermined time CPI (Coherent Pr).
coherent integration based on the held sample value for each processing interval, and a Doppler frequency component in Doppler cells is detected by a detection circuit 114.
To supply. This coherent integration improves the signal-to-noise power ratio.

The detection circuit 114 performs detection such as amplitude detection or square detection on the signal for each Doppler frequency component (ie, each Doppler cell) from the coherent integration circuit 113, and detects an amplitude signal or a power signal. The signal after the detection is supplied to the incoherent integration circuit 107.

The incoherent integration circuit 107 has a CP
A signal for each Doppler cell supplied for each I is processed for a predetermined time SPI (Signal Processing).
Interval), the incoherent integration is performed for the same Doppler cell for each SPI, and the value obtained by the incoherent integration is stored in the target detection circuit 108.
To supply. Thus, the target detection probability is improved by performing incoherent integration.

When the power of each Doppler cell signal exceeds a predetermined threshold based on the probability (false alarm probability) that noise is erroneously determined as a received signal from the target, the target detection circuit 108 And that there is a received signal from
When the power of the signal of each Doppler cell is equal to or less than the threshold, it is determined that there is no received signal from the target, and when it is determined that there is a received signal, an alarm is generated for the Doppler cell.

In this manner, the radar function is realized while interfering with the target radar function. Further, for example, JP-A-54-80694 and JP-A-59-19298.
Japanese Patent Application Laid-Open No. 4 (1999) -1995 discloses an apparatus that randomly changes the frequency of a radar radio wave to be transmitted and executes radar processing that is less susceptible to interference.

[0015]

Since the conventional transmitting and receiving apparatus is configured as described above, the problem arises that the total value of the transmission power becomes large because the radio wave for interference and the radio wave for radar are generated separately. was there. Also, when simply using jamming radio waves as radar radio waves, the target reflection cross-sectional area is substantially small because the frequency band of the jamming radio waves is too wide for the radar function and the range resolution is high. There is a problem that the signal-to-noise power ratio deteriorates.

The present invention has been made to solve the above-described problems, and transmits a signal generated for interference as radio waves, and detects radio waves reflected on a target by a plurality of receivers having different reception frequency bands. It is an object of the present invention to provide a transmission / reception apparatus and a transmission / reception method that can perform target detection, reduce the total value of transmission power, and ensure an appropriate range resolution with a good signal-to-noise power ratio. I do.

[0017]

A transmitting / receiving apparatus according to the present invention includes a transmitting means for transmitting a radio wave in a predetermined transmission frequency band, a radio wave transmitted by the transmitting means and reflected on a target, and A plurality of receiving means having different frequency bands for phase-detecting the components of the predetermined frequency band, a plurality of coherent integrating means for coherently integrating signals processed by the plurality of receiving means for each Doppler cell, and a plurality of coherent Each of the coherently integrated signals detected by the integrating means is detected for each Doppler cell, and a plurality of detecting means for outputting the signals, a Doppler compensating means for specifying a correspondence relation of Doppler cells between respective frequency bands, and a Doppler compensating means for specifying For each Doppler cell specified by the Doppler cell correspondence, multiple Those comprising a target detection judging means for performing detection determination of the target based on the output of the wave means.

In the transmission / reception apparatus according to the present invention, as target detection determination means, incoherent integration for incoherently integrating the outputs of a plurality of detection means for each same Doppler cell specified by the Doppler cell correspondence specified by the Doppler compensation means. Means, and determination means for executing detection determination of a target for each same Doppler cell based on the power of the signal incoherently integrated by the incoherent integration means.

[0019] In the transmission / reception apparatus according to the present invention, the target detection / judgment means may include,
The detection detection of the target is executed based on whether or not the power values of at least a predetermined number of outputs of all the detection means are higher than a predetermined threshold value.

The transmitting / receiving apparatus according to the present invention includes a selecting means for selecting one of the outputs of the detecting means, wherein the transmitting means switches the transmission frequency at predetermined time intervals to transmit a radio wave, and the selecting means transmits the radio wave. The output of the detecting means corresponding to the receiving means that processes the frequency band including the frequency is selected, and the target detection determining means sequentially accumulates the outputs of the detecting means selected by the selecting means, and outputs the outputs of the plurality of accumulated detecting means. The detection and determination of the target is executed based on this.

A transmitting / receiving apparatus according to the present invention includes a plurality of transmitting means for transmitting radio waves in predetermined transmission frequency bands different from each other, a radio wave transmitted by the transmitting means and reflected on a target, and A plurality of receiving units having different frequency bands for phase-detecting components in the same frequency band as the transmitting frequency bands of the plurality of transmitting units, and a plurality of coherently integrating signals processed by the plurality of receiving units for each Doppler cell. A coherent integration means, a plurality of detection means for detecting and outputting a signal coherently integrated by each of the plurality of coherent integration means for each Doppler cell, and a plurality of detection means for outputting, and a Doppler compensation means for specifying a correspondence relationship of Doppler cells between respective frequency bands. , Specified by Doppler cell correspondence specified by Doppler compensation means Each same Doppuraseru which is one and a target detection judging means for performing detection determination of the target on the basis of the outputs of the plurality of detecting means.

In the transmitting / receiving apparatus according to the present invention, as the target detection determining means, incoherent integrating means for incoherently integrating the output of the detecting means for each same Doppler cell specified by the Doppler cell correspondence specified by the Doppler compensating means; And determination means for executing a target detection determination based on the power of the signal incoherently integrated by the incoherent integration means.

In the transmission / reception apparatus according to the present invention, the target detection / judgment means is provided for each same Doppler cell specified by the correspondence of the Doppler cells specified by the Doppler compensation means.
The detection detection of the target is executed based on whether or not the power values of at least a predetermined number of outputs of all the detection means are higher than a predetermined threshold value.

The transmitting / receiving apparatus according to the present invention comprises a selecting means for selecting any output of the detecting means, a plurality of transmitting means transmitting radio waves having predetermined transmission frequencies different from each other, and Select the output of the detection means corresponding to the reception means to process for the frequency band including,
The target detection determination means sequentially accumulates the outputs of the detection means selected by the selection means, and executes the target detection determination based on the accumulated outputs of the plurality of detection means.

The transmitting and receiving method according to the present invention includes a step of transmitting radio waves in a predetermined frequency band, a step of receiving radio waves transmitted and reflected to a target, and a method of dividing the predetermined frequency band by a predetermined number. Phase detecting each of the signals received for the band, coherently integrating the respective phase-detected signals for each Doppler cell, detecting each of the coherently integrated signals for each Doppler cell, and The method comprises the steps of specifying a Doppler cell correspondence and executing a target detection determination based on the detected signal for each Doppler cell specified by the specified Doppler cell correspondence.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a transmission / reception apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a block diagram showing a configuration of each signal processing circuit of FIG. In FIG. 1, reference numeral 1 denotes a transmitting antenna (transmitting means) for transmitting a transmission signal generated by a transmitter 2 as a radio wave; It is a transmitter (transmitting means) for transmitting radio waves in a frequency band.

Receiving antennas (receiving means) 3-1 to 3-N receive radio waves transmitted by the transmitter 2 and reflected to a target, and supply received signals to the signal processing circuits 4-1 to 4-N, respectively. is there. 4-1 to 4-N are the receiver 11, A / D
Each of the signal processing circuits includes a converter 12, a coherent integration circuit 13, and a detection circuit 14, and includes N (N> 1) signal reception circuits of different reception frequency bands of the receiver 11.

The signal processing circuit 4-i (i = 1,...,
In N), reference numeral 11 denotes N obtained by dividing a transmission frequency band into N based on a target length in a range direction, a required distance resolution, and the like.
A receiver (reception means) for phase-detecting a signal of a component in any one of the frequency bands, and an A / D converter 12 for converting an analog signal processed by the receiver 11 into a digital signal 13 is a coherent integration circuit (coherent integration means) for coherently integrating the digital signal converted by the A / D converter 12 for each Doppler cell, and 14 is a coherent integration circuit 1
3 is a detection circuit (detection means) for detecting and outputting the signal coherently integrated by 3.

5 obtains a wavelength λi corresponding to the center frequency of the reception frequency band from the receiver 11 of each signal processing circuit 4-i, and based on those wavelengths λi (i = 1,..., N). A Doppler compensating circuit (Doppler compensating means) for specifying a Doppler cell correspondence between each signal processing circuit 4-i, that is, between each frequency band of the receiver 11.

Reference numeral 6 denotes incoherent integration for improving the target detection probability by incoherently integrating the outputs of the signal processing circuits 4-1 to 4-N for the same Doppler cell based on the Doppler cell correspondence specified by the Doppler compensation circuit 5. It is an integration circuit (target detection determination means, incoherent integration means).

Reference numeral 7 denotes a target detection circuit (target detection determination means, which performs target detection determination based on the power of the signal incoherently integrated by the incoherent integration circuit 6.
Determination means).

Next, the operation will be described. FIG. 3 is a block diagram of a target radar function (ECM (Electric Cou)).
FIG. 4 is a diagram showing a correspondence relationship between a band used for the measurement of the target position and a band used for measuring the target position. FIG. 4 is a flowchart for explaining the operation of the Doppler compensation circuit 5.

The transmitter 2 generates a transmission signal for the purpose of obstructing the target radar function and measuring the target position, and transmits the signal as a radio wave by the transmission antenna 1. At this time, the transmitter 2
Generates a transmission signal of the required bandwidth to interfere with the target radar function. In the target, in addition to the signal transmitted from the target and reflected on the moving body equipped with the device, the transmitting antenna 1
Since the transmitted signals transmitted by the above are simultaneously received, the reflected signal is buried in the transmitted signal, and the target radar function is paralyzed.

The radio wave transmitted from the transmitting antenna 1 is reflected to a target and received by the receiving antennas 3-1 to 3-N. The signals received by the receiving antennas 3-1 to 3-N are transmitted to a receiver 1 of N signal processing circuits 4-1 to 4-N.
1 respectively.

As shown in FIG. 3, the receiver 11 of each signal processing circuit 4-i sets the i-th band of the N-divided transmission frequency band as the reception frequency band, and performs phase control on the components of the band. Perform detection. In each receiver 11, the mixer multiplies the received signal by the signal of the center frequency of the i-th band and the signal whose phase is advanced by 90 degrees from the signal to generate an I signal and a Q signal. , Phase detection is performed on the component of the i-th band. Each receiver 11 supplies a wavelength λi, which is the reciprocal of the center frequency of the i-th band, to the Doppler compensation circuit 5.

Next, the A / D converter 12 of each signal processing circuit 4-i converts the I signal and Q signal (analog signal) into a digital signal and supplies the digital signal to the coherent integration circuit 13. That is, the A / D converter 12 converts the format of the signal from the receiver 11 from analog to digital, and
1 is supplied to the coherent integration circuit 13.
The coherent integration circuit 13 samples the supplied signal at a predetermined time T, holds a sample value of a predetermined number of times M, and performs a coherent integration based on the held sample value at a predetermined time CPI. And supplies the Doppler frequency component of the Doppler cell unit to the detection circuit 14. This coherent integration improves the signal-to-noise power ratio.

At this time, the sampled M signals are represented by st (0), st (1),..., St (M−1), and the Doppler frequency of the Doppler cell unit (δf) is represented by f
(0), f (1),..., F (M−1), the coherent integration circuit 13 performs coherent integration for each CPI according to the equation (1), and executes the respective Doppler frequencies f
(0), f (1),..., F (M−1), that is, the components sf (0), sf (1),.
Calculate f (M-1).

(Equation 1)

Note that the frequency width δf of the Doppler cell is 1 /
(M · T), and the Doppler frequency f (i) is m · δf
(M = 0, 1,..., M−1).

The detection circuit 1 of each signal processing circuit 4-i
4 is a signal s for each Doppler frequency component (ie, each Doppler cell) from the coherent integration circuit 13
For each of f (m) (m = 0,..., M−1), detection such as amplitude detection and square detection is performed, and the detected signal p (m) (m = 0,. , M−1) to the incoherent integration circuit 6.

That is, the detection circuit 14 of each signal processing circuit 4-i outputs the signal sf from the coherent integration circuit 13
Signal p (m) after detection according to equation (2) based on (m)
Is calculated for each Doppler frequency f (m), that is, for each Doppler cell.

(Equation 2)

Next, the Doppler compensating circuit 5 has a wavelength λi from the receiver 11 of each signal processing circuit 4-i because the magnitude of the Doppler frequency is different due to the difference in the transmission frequency band.
, The correspondence between the Doppler cells having the same Doppler frequency among the respective signal processing circuits 4-i is specified in accordance with Expression (3), and is supplied to the incoherent integration circuit 6. Since the reception frequency band of each signal processing circuit 4-i by the receiver 11 is fixed, it is sufficient to supply the Doppler cell correspondence to the incoherent integration circuit 6 only once at first.

(Equation 3)

At this time, the Doppler compensation circuit 5 is, for example, as shown in FIG.
The operation shown in (1) is executed to specify the correspondence of Doppler cells.

First, in step ST1 of FIG. 4, the Doppler compensating circuit 5 sets the set C to an empty set, sets a counter k indicating a variable k to 0, and sets a counter l indicating variables l (ell) and m.
(L), 1 is set to m.

Next, the Doppler compensation circuit 5 executes step ST2.
In step ST3, 1 is set to a counter i indicating a variable i, and in step ST3, the signal processing circuit 4-
Calculate the number of the Doppler cell by the signal processing circuit 4-i corresponding to the k-th Doppler cell by l (ell),
Substitute for c (i).

Next, in step ST4, it is determined whether or not the value of the counter i is equal to the total number N of the signal processing circuits 4-1 to 4-N. If the value of the counter i is smaller than the total number N, the process proceeds to step ST5. In step, the value of the counter i is increased by 1, and the process returns to step ST3. In this way, the Doppler compensation circuit 5 outputs the signal processing circuit 4-1 corresponding to the k-th Doppler cell by the signal processing circuit 4-1 (ell).
Sequence c (1) indicating the number of the Doppler cell in 4-N
Generate c (N).

In step ST6, the Doppler compensating circuit 5 sets c (1) = c
An array c that satisfies the condition (1, n) and c (2) = c (2, n) and... And c (N) = c (N, n)
It is determined whether or not (i, n) (n = 1,..., M-1) exists. If the array c (i, n) does not exist in the set C, the Doppler compensation circuit 5 converts the arrays c (1) to c (N) into the arrays c (1, m) to c in step ST7.
(N, m) is added to the set C, and in step ST8, the value of the counter m is increased by one. On the other hand, if the array c (i, n) exists in the set C,
T7 and step ST8 are skipped.

Then, the Doppler compensation circuit 5 performs step S
At T9, it is determined whether or not the value of the counter k is equal to or larger than the number M-1 of the last Doppler cell. If the value of the counter k is smaller than the number M-1 of the last Doppler cell, the value of the counter k is determined at step ST10. Is increased by 1 and the process returns to step ST2 to execute the processing of steps ST2 to ST9. In this manner, the signal processing circuits 4-1 to 4-N corresponding to the 0th to (M-1) th Doppler cells by the signal processing circuit 4-1 (ell).
Are stored in the set C as a correspondence relationship.

Then, the Doppler compensation circuit 5 performs step S
At T11, it is determined whether or not the value of the counter 1 (L) is equal to or greater than the total number N of the signal processing circuits 4-1 to 4-N. If the total number N is smaller than N, the counter k is reset to 0 in step ST12, the value of the counter l is increased by 1, and the process returns to step ST2.
The processing of steps ST2 to ST11 is executed.
In this way, the Doppler cell correspondences for all the signal processing circuits 4-1 to 4-N are stored in the set C as an array.

Then, in step ST13, the Doppler compensating circuit 5 generates (m-1) arrays c (i, 1),..., C (i, m-1) (i = 1,
.., N) are supplied to the incoherent integration circuit 6 as (m-1) sets of correspondences.

In this way, the Doppler compensating circuit 5 specifies the correspondence between the signal processing circuits 4-i of the Doppler cell and supplies it to the incoherent integrating circuit 6.

Next, the incoherent integrator 6 is configured to generate N sets of signals supplied from the detectors 14 of the signal processing circuits 4-1 to 4-N based on the respective correspondences of the Doppler cells supplied by the Doppler compensator 5. Signal p (m) (m
= 0,..., M−1), the sum of Doppler cell signals having the same Doppler frequency is calculated to perform incoherent integration for each Doppler cell, and the calculation result is supplied to the target detection circuit 7.

That is, assuming that the signal p (m) from the signal processing circuit 4-i is p (i, m) and the result of the incoherent integration is p2 (j), the incoherent integration circuit 6 calculates ), Each correspondence c (i, j) (i =
1,..., N) is performed.

(Equation 4)

The target detection circuit 7 incoherently integrates a predetermined threshold value set in advance based on the probability (false alarm probability) that noise is erroneously determined as a received signal from the target for each correspondence relationship. If the power exceeds, it is determined that there is a received signal from the target, if the power of the signal is less than or equal to the threshold, it is determined that there is no received signal from the target, if it is determined that there is a received signal, An alert is generated for the Doppler cell. When it is determined that there is a received signal, the distance to the target is calculated based on the received signal.

As described above, according to the first embodiment, a transmission signal in a predetermined frequency band is transmitted, and the frequency band of the transmission signal is divided into N bands necessary for the radar function by the signal reflected to the target. The signals of the respective frequency bands are received by the signal processing circuits 4-1 to 4-N, respectively, and subjected to signal processing, so that the total value of the transmission power is reduced, and a proper signal-to-noise power ratio is obtained. The effect that the range resolution can be secured can be obtained. That is, by dividing the frequency band into N and receiving the signals with the receivers of the N signal processing circuits, it is possible to secure a sufficient range resolution with a good signal-to-noise power ratio.

According to the first embodiment, an effect is obtained that the function of obstructing the target radar and the radar function can be simultaneously realized.

Embodiment 2 FIG. 5 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 2 of the present invention.
In the figure, 1-i (i = 1,..., N) indicates a transmitter 2
-I is a transmission antenna (transmitting means) for transmitting the transmission signal generated by i as a radio wave, and 2-i (i = 1,...)
., N) is a transmitter (transmitting means) for generating a transmission signal of an ith frequency band among N frequency bands obtained by dividing a predetermined frequency band into N, and 21-i (i = 1, 2).・ ・
., N) execute signal processing of the component of the i-th frequency band among the signals received by the transmitter 2-i that generates the transmission signal of the i-th frequency band and the reception antenna 3-i. This is a transmission / reception unit having a signal processing circuit 4-i. The other components in FIG. 5 are the same as those according to the first embodiment (FIG. 1), and will not be described.

Next, the operation will be described. Transmitter 2-1
.About.2-N respectively transmit transmission signals in the same frequency band as the reception frequency band of the receiver 11 of the signal processing circuits 4-1 to 4-N for the purpose of obstructing the target radar function and measuring the target position. It is generated and transmitted as radio waves by the transmission antenna 1. At this time, the transmitters 2-1 to 2-
The N transmit signals generated by N ensure the bandwidth required to interfere with the target radar function. In the goal,
In addition to the signal transmitted from the target and reflected by the moving body equipped with the device, the transmitted signals transmitted by the transmitting antennas 1-1 to 1-N are simultaneously received, so that the reflected signal is buried in the transmitted signal. The target radar function is paralyzed.

The radio waves transmitted from the transmitting antennas 1-1 to 1-N are reflected to the target and received by the receiving antennas 3-1 to 3-1.
-N. The signals received by the receiving antennas 3-1 to 3-N are N signal processing circuits 4-1 to 4-N.
N receivers 11 respectively.

Hereinafter, the operations of the signal processing circuits 4-1 to 4-N, the Doppler compensating circuit 5, the incoherent integrating circuit 6, and the target detecting circuit 7 are the same as those in the first embodiment. Omitted.

As described above, according to the second embodiment, the transmission signals of the respective frequency bands obtained by dividing the predetermined frequency band into N bands necessary for the radar function are transmitted, and each of the transmission signals reflected to the target is transmitted. Signals in the frequency band are received by the signal processing circuits 4-1 to 4-N, respectively, and subjected to signal processing. Therefore, the total value of transmission power is reduced, and an appropriate range resolution with a good signal-to-noise power ratio is achieved. Can be obtained.

According to the second embodiment, an effect is obtained that the function of interfering with the target radar and the radar function can be simultaneously realized.

Embodiment 3 FIG. 6 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 3 of the present invention.
In the figure, reference numeral 2A denotes a transmitter (transmission means) for generating a transmission signal by switching the transmission frequency at predetermined time intervals.
2 is a signal processing circuit 4 according to the transmission frequency of the transmitter 2A.
-1 to 4-N, select an output of a component that performs signal processing on a component of a frequency band including a transmission frequency,
A signal processing system selection circuit (selection means) for supplying the selected output to the incoherent integration circuit 6. The other components in FIG. 6 are the same as those according to the first embodiment (FIG. 1), and will not be described.

Next, the operation will be described. The transmitter 2A switches the transmission frequency at predetermined time intervals to generate a transmission signal, and transmits the transmission signal as a radio wave by the transmission antenna 1. At this time, the center frequency of any of the N frequency bands processed by the signal processing circuits 4-1 to 4-N is repeatedly set as the transmission frequency in order. Further, the transmitter 2A supplies information on the transmission frequency at each time to the signal processing system selection circuit 22.

The radio wave transmitted by the transmitting antenna 1 is received by the receiving antennas 3-1 to 3-N when reflected on the target. Then, the signal processing circuits 4-1 to 4-N execute signal processing for each frequency band of the signals received by the receiving antennas 3-1 to 3-N, and supply the processed signals to the signal processing system selection circuit 22. . At this time, the transmitter 2
The signal transmitted by A and the transmission antenna 1 and reflected by the target and received is processed by any one of the signal processing circuits 4-1 to 4-N and supplied to the signal processing system selection circuit 22.

The signal processing system selection circuit 22 performs signal processing on a frequency band including the transmission frequency based on information on the transmission frequency from the transmitter 2A.
And supplies the selected output to the incoherent integration circuit 6. At this time, the signal processing system selection circuit 22
Is the time T calculated by the equation (5) from the time T0 when the radio wave of the i-th frequency fi is transmitted at the time T0.
The output signal of the signal processing circuit 4-i is supplied to the incoherent integration circuit 6 only for a period of time (until the transmission signal of the frequency fi reflected on the target is received).

(Equation 5)

The incoherent integration circuit 6 passes through the signal processing system selection circuit 22 until the received signals for all the frequency bands, that is, the output signals of all the signal processing circuits 4-1 to 4-N are supplied. After the supplied signals are held and the output signals of all the signal processing circuits 4-1 to 4-N are supplied, incoherent integration is performed based on the Doppler cell correspondence from the Doppler compensation circuit 5.

The operations of the signal processing circuits 4-1 to 4-N, the Doppler compensating circuit 5, the incoherent integrating circuit 6, and the target detecting circuit 7 are the same as those in the first embodiment, and the description thereof is omitted. I do.

As described above, according to the third embodiment, the signal processing circuit 4-i for transmitting the transmission signal by switching the frequency in order and processing the reception signal in the frequency band including the frequency of the transmission signal. Since only the output is selected and the incoherent integration is executed after the outputs of all the signal processing circuits 4-1 to 4-N are obtained, the signal reflected to the target is selected according to the frequency of the transmission signal. Since the output signals of the unprocessed signal processing circuits 4-1 to 4-N are not included in the incoherent integration, an effect that the target is detected with a higher probability is obtained.

Embodiment 4 FIG. 7 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 4 of the present invention.
In the figure, 2A-1 to 2A-N transmit transmission signals of a frequency (for example, a center frequency) belonging to an ith frequency band among N frequency bands obtained by dividing a predetermined frequency band into N at predetermined time intervals. Transmitters (transmitting means) that generate the signals in order, and 22 includes the transmission frequency of the signal processing circuits 4-1 to 4-N according to the transmitter 2A-i that generates the transmission signal. A signal processing system selection circuit that selects an output of a component that performs signal processing on a frequency band component and supplies the selected output to the incoherent integration circuit 6. The other components in FIG. 7 are the same as those according to the second embodiment (FIG. 5), and thus description thereof will be omitted.

Next, the operation will be described. Transmitter 2A-
i generates a transmission signal of a frequency belonging to the same transmission frequency band as the frequency band of the reception signal processed by the signal processing circuit 4-i at predetermined time intervals, and transmits the transmission antenna 1-i
Is transmitted as radio waves. That is, the transmitter 2A-1
~ 2A-N repeatedly generate transmission signals in order,
At a time, only one transmitter 2A-i generates a transmission signal. Further, the transmitters 2A-1 to 2A-N transmit information indicating whether or not a transmission signal is being generated at each time, to the signal processing system selection circuit 22.
To supply.

The radio wave transmitted by the transmitting antenna 1-i is reflected by the target and received by the receiving antennas 3-1 to 3-N. Then, the signal processing circuits 4-1 to 4-N execute signal processing for each frequency band of the signals received by the reception antennas 3-1 to 3-N, and supply the processed signals to the signal processing system selection circuit 22. I do. At this time, the signal transmitted by the transmitter 2A-i and the transmission antenna 1-i and reflected and received by the target is received by the signal processing circuit 4A.
The signal is processed by any one of −1 to 4-N and supplied to the signal processing system selection circuit 22.

The signal processing system selection circuit 22 includes a transmitter 2A-
The output of the signal processing circuit 4-i corresponding to the transmitter 2A-i that is generating the transmission signal is selected based on the information from 1-2A-N, and the selected output is supplied to the incoherent integration circuit 6. I do. At this time, the signal processing system selection circuit 22
When the radio wave of the i-th frequency fi is transmitted at the time T0, the time T calculated from the expression (5) from the time T0 (the time until the transmission signal of the frequency fi reflected on the target is received) is obtained. The output signal of the signal processing circuit 4-i is supplied to the incoherent integration circuit 6.

The incoherent integration circuit 6 passes through the signal processing system selection circuit 22 until the received signals for all the frequency bands, that is, the output signals of all the signal processing circuits 4-1 to 4-N are supplied. After the supplied signals are held and the output signals of all the signal processing circuits 4-1 to 4-N are supplied, incoherent integration is executed based on the correspondence of the Doppler cells from the Doppler compensation circuit 5.

The operations of the signal processing circuits 4-1 to 4-N, the Doppler compensating circuit 5, the incoherent integrating circuit 6, and the target detecting circuit 7 are the same as those in the first embodiment, so that the description is omitted. I do.

As described above, according to the fourth embodiment, the signal processing circuit 4-i for transmitting the transmission signal of any frequency in order and processing the reception signal of the frequency band including the frequency of the transmission signal. Is selected, and the incoherent integration is performed after the outputs of all the signal processing circuits 4-1 to 4-N are obtained. Therefore, the signal reflected to the target according to the frequency of the transmission signal is selected. Since the output signals of the signal processing circuits 4-1 to 4-N that do not process are not included in the incoherent integration, the effect that the target is detected more accurately can be obtained.

Embodiment 5 FIG. 8 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 5 of the present invention.
The transmitting and receiving apparatus according to the fifth embodiment of the present invention is different from the transmitting and receiving apparatus according to the first embodiment in that the incoherent integration circuit 6 and the target detection circuit 7 are provided with an M-in-N detection circuit 23.

In the figure, reference numeral 23 denotes all the signal processing circuits 4-1 to 4--4 for each same Doppler cell based on the correspondence of the Doppler cells specified by the Doppler compensation circuit 5.
A medium-M detection circuit (target detection determination means) that performs target detection determination based on whether or not the power values of predetermined M or more outputs of the N N outputs are higher than a predetermined threshold value is there. The other components in FIG. 8 are the same as those according to the first embodiment (FIG. 1), and thus description thereof will be omitted.

Next, the operation will be described. The M-in-N detection circuit 23 calculates the power values of the N outputs of all the signal processing circuits 4-1 to 4-N, and for each of the same Doppler cells based on the correspondence of the Doppler cells specified by the Doppler compensation circuit 5. Then, it is determined whether or not the power values of predetermined M or more outputs of the N outputs are higher than a threshold value set based on the false alarm probability. When it is determined that the power values of the predetermined M or more outputs of the N outputs are higher than a threshold value set based on the false alarm probability, the N-in-M detection circuit 23 determines that the target has been detected. And generate an alarm. In that case, the distance to the target is calculated based on the received signal.

The operations of the transmitting antenna 1, the transmitter 2, the receiving antennas 3-1 to 3-N, the signal processing circuits 4-1 to 4-N, and the Doppler compensating circuit 5 are described in the first embodiment.
Therefore, the description is omitted.

As described above, according to the fifth embodiment, a transmission signal in a predetermined frequency band is transmitted, and a signal in each frequency band obtained by dividing the frequency band of the transmission signal into N bands necessary for a radar function is transmitted. Received by the receiving antennas 3-1 to 3-N and the signal processing circuits 4-1 to 4-N, respectively,
Since the signal processing is performed, it is possible to obtain an effect that the total value of the transmission power can be reduced and a sufficient range resolution can be secured with a good signal-to-noise power ratio.

Further, according to the fifth embodiment, an effect is obtained that the function of obstructing the target radar and the radar function can be realized at the same time.

As in the third embodiment, a transmitter 2A may be provided instead of the transmitter 2, and a signal processing system selection circuit 22 may be added. By doing so, the same effect as in the third embodiment can be obtained.

Embodiment 6 FIG. FIG. 9 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 6 of the present invention.
The transmitting and receiving apparatus according to the sixth embodiment of the present invention is different from the transmitting and receiving apparatus according to the second embodiment in that an in-middle M detection circuit 23 is provided instead of the incoherent integration circuit 6 and the target detection circuit 7. The components of the transmission / reception device shown in FIG. 9 are the same as those according to the second or fifth embodiment, and a description thereof will be omitted.

Next, the operation will be described. The M-in-N detection circuit 23 calculates the power values of the N outputs of all the signal processing circuits 4-1 to 4-N, and for each of the same Doppler cells based on the correspondence of the Doppler cells specified by the Doppler compensation circuit 5. Then, it is determined whether or not the power values of predetermined M or more outputs of the N outputs are higher than a threshold value set based on the false alarm probability. When it is determined that the power values of the predetermined M or more outputs of the N outputs are higher than a threshold value set based on the false alarm probability, the N-in-M detection circuit 23 determines that the target has been detected. And generate an alarm. In that case, the distance to the target is calculated based on the received signal.

The transmitting antennas 1-1 to 1-N, the transmitters 2-1 to 2-N, the receiving antennas 3-1 to 3-N, the signal processing circuits 4-1 to 4-N, and the Doppler compensation circuit 5 Is similar to that according to the second embodiment, and the description thereof is omitted.

As described above, according to the sixth embodiment, the transmission signals in the respective frequency bands obtained by dividing a predetermined frequency band into N bands necessary for the radar function are transmitted, and each of the transmission signals reflected to the target is transmitted. Since the signals in the frequency band are respectively received by the signal processing circuits 4-1 to 4-N and subjected to signal processing, the total value of the transmission power is reduced, and a sufficient signal-to-noise power ratio and a sufficient range resolution are provided. Can be obtained.

According to the sixth embodiment, an effect is obtained that the function of interfering with the target radar and the radar function can be simultaneously realized.

Note that, as in Embodiment 4, the transmitter 2-
The transmitters 2 </ b> A- 1 to 2 </ b> A-N may be provided instead of 1 to 2-N, and the signal processing system selection circuit 22 may be added. By doing so, the same effect as in the fourth embodiment can be obtained.

[0089]

As described above, according to the present invention, a transmitting means for transmitting a radio wave in a predetermined transmission frequency band, a radio wave transmitted by the transmitting means and reflected on a target, and A plurality of receiving units having different frequency bands for phase-detecting a component of a predetermined frequency band, a plurality of coherent integrating units for coherently integrating signals processed by the plurality of receiving units for each Doppler cell, and a plurality of coherent integrating units A plurality of detection means for detecting and outputting the signals coherently integrated by the means for each Doppler cell, a plurality of detection means for outputting, a Doppler compensation means for specifying a correspondence relation of Doppler cells between respective frequency bands, and a Doppler cell specified by the Doppler compensation means For each same Doppler cell specified by the correspondence of
And a target detection / determination means for performing a target detection / determination based on the outputs of the plurality of detection means, so that the total value of the transmission power is reduced and a sufficient signal-to-noise power ratio and a sufficient range resolution are provided. There is an effect that can be secured. Further, there is an effect that the function of interfering with the target radar and the radar function can be realized at the same time.

According to the present invention, the transmitting means switches the transmission frequency at predetermined time intervals to transmit radio waves, and the selecting means selects the output of the detecting means corresponding to the receiving means for processing the frequency band including the transmitting frequency. Since the target detection and determination means is configured to sequentially accumulate the outputs of the detection means selected by the selection means and execute the target detection determination based on the accumulated outputs of the plurality of detection means, the frequency of the transmission signal Accordingly, the output signal of the signal processing means that does not process the signal reflected on the target is not included in the incoherent integration, so that the target can be detected more accurately.

According to the present invention, a plurality of transmitting means for transmitting radio waves of a predetermined transmission frequency band different from each other, a plurality of radio waves received by the transmitting means and reflected on a target, A plurality of receiving means having different frequency bands for phase-detecting components of the same frequency band as the transmitting frequency band of the transmitting means; and a plurality of coherent integrations for coherently integrating signals processed by the plurality of receiving means for each Doppler cell. Means, a plurality of detection means for detecting and outputting a signal coherently integrated by each of the plurality of coherent integration means for each Doppler cell, a Doppler compensating means for specifying a Doppler cell correspondence between frequency bands, and a Doppler The same specified by the Doppler cell correspondence specified by the compensation means Each target cell has target detection and determination means for performing target detection determination based on the outputs of the plurality of detection means, so that the total value of transmission power is reduced and a good signal-to-noise power ratio is achieved. There is an effect that a sufficient range resolution can be secured.
Further, there is an effect that the function of interfering with the target radar and the radar function can be realized at the same time.

According to the present invention, the plurality of transmitting means transmit radio waves having predetermined transmission frequencies different from each other, and the selecting means selects the output of the detecting means corresponding to the receiving means for processing the frequency band including the transmitting frequency. The target detection determination means sequentially accumulates the outputs of the detection means selected by the selection means, and executes the target detection determination based on the accumulated outputs of the plurality of detection means. Since the output signal of the signal processing means that does not process the signal reflected by the target is not included in the incoherent integration, the target can be detected more accurately.

According to the present invention, the step of transmitting radio waves of a predetermined frequency band, the step of receiving radio waves transmitted and reflected to a target, and the steps of dividing a predetermined frequency band by a predetermined number Phase detecting each of the received signals, coherently integrating the phase-detected signals for each Doppler cell, detecting each of the coherently integrated signals for each Doppler cell, and Doppler cell correspondence between frequency bands And the step of executing a target detection determination based on the detected signal for each of the same Doppler cells specified by the correspondence of the specified Doppler cells, so that the total value of the transmission power With a good signal-to-noise ratio and sufficient range There is an effect that it is possible to ensure the ability.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram illustrating a configuration of each signal processing circuit of FIG. 1;

FIG. 3 is a diagram showing a correspondence relationship between a band used for disturbance of a target radar function (ECM function) and a band used for measurement of a target position.

FIG. 4 is a flowchart illustrating an operation of the Doppler compensation circuit.

FIG. 5 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 2 of the present invention.

FIG. 6 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 3 of the present invention.

FIG. 7 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 4 of the present invention.

FIG. 8 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 5 of the present invention.

FIG. 9 is a block diagram showing a configuration of a transmitting / receiving apparatus according to Embodiment 6 of the present invention.

FIG. 10 is a block diagram showing a conventional transmitting / receiving apparatus.

FIG. 11 is a block diagram showing a configuration of a receiver in a conventional transmitting / receiving apparatus.

[Explanation of symbols]

1, 1-1 to 1-N transmitting antenna (transmitting means), 2,
2-1 to 2-N, 2A, 2A-1 to 2A-N Transmitter (transmitting means), 3-1 to 3-N Receiving antenna (receiving means), 5 Doppler compensation circuit (Doppler compensating means), 6
Incoherent integration circuit (target detection determination means, incoherent integration means), 7 target detection circuit (target detection determination means, determination means), 11 receiver (reception means), 1
3 coherent integration circuit (coherent integration means),
14 detection circuit (detection means), 22 signal processing system selection circuit (selection means), 23N medium-M detection circuit (target detection determination means).

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Kosuge 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5J070 AB01 AD02 AD06 AH02 AH31 AK22 BA01 BH11

Claims (9)

[Claims] A transmitting means for transmitting a radio wave in a predetermined transmission frequency band; a radio wave transmitted by the transmitting means and reflected to a target; receiving a component in a predetermined frequency band in the transmission frequency band; A plurality of receiving means having different frequency bands from each other, a plurality of coherent integrating means for coherently integrating the signals respectively processed by the plurality of receiving means for each Doppler cell, and a plurality of coherent integrating means by the plurality of coherent integrating means, respectively. A plurality of detecting means for detecting and outputting the detected signal for each Doppler cell, a Doppler compensating means for specifying a Doppler cell correspondence between frequency bands, and a Doppler cell specified by the Doppler cell specifying the Doppler cell correspondence. Output of the plurality of detection means for each same Doppler cell Transceiver that includes a target detection judging means for performing detection determination of the target based on. 2. The incoherent integration means for incoherently integrating the outputs of a plurality of detection means for each of the same Doppler cells specified by the Doppler cell correspondence specified by the Doppler compensation means, and the incoherent 2. The transmission / reception apparatus according to claim 1, further comprising: a determination unit configured to execute a target detection determination for each of the same Doppler cells based on the power of the signal incoherently integrated by the integration unit. 3. The target detection determining means, for each of the same Doppler cells specified by the correspondence of the Doppler cells specified by the Doppler compensating means, at least a predetermined number of the power values of the outputs of all the detecting means. The transmission / reception apparatus according to claim 1, wherein a target detection determination is performed based on whether or not is higher than a predetermined threshold. 4. A radio communication system comprising: a selector for selecting one of the outputs of the detector, wherein the transmitter switches a transmission frequency at predetermined time intervals to transmit a radio wave, and wherein the selector selects the transmission frequency. Selecting an output of the detecting means corresponding to the receiving means for processing the included frequency band; a target detection judging means sequentially accumulates the outputs of the detecting means selected by the selecting means; 4. The method according to claim 1, wherein the detection of the target is determined based on the output of the target.
The transmission / reception device according to the item. 5. A plurality of transmitting means for transmitting radio waves of a predetermined transmission frequency band different from each other, and receiving the radio waves transmitted by the transmitting means and reflected on a target, and the plurality of transmitting means of the received signals. A plurality of receiving means different from each other in the frequency band for phase-detecting a component in the same frequency band as the transmission frequency band; and a plurality of coherents for coherently integrating signals processed by the plurality of receiving means for each Doppler cell. Integrating means, a plurality of detecting means for detecting and outputting the coherently integrated signals respectively by the plurality of coherent integrating means for each Doppler cell, and Doppler compensating means for specifying the correspondence of Doppler cells between respective frequency bands. According to the correspondence of the Doppler cells specified by the Doppler compensating means, Each same Doppuraseru is constant, reception apparatus provided with a target detection determination means for performing a detection determining a target based on outputs of the plurality of the detection means. 6. The incoherent integration means for incoherently integrating the output of the detection means for each of the same Doppler cells specified by the correspondence of the Doppler cells specified by the Doppler compensation means, and the incoherent integration means 6. The transmission / reception apparatus according to claim 5, further comprising: a determination unit configured to perform a target detection determination based on the power of the signal incoherently integrated by the control unit. 7. The target detection determining means, for each of the same Doppler cells specified by the Doppler cell correspondence specified by the Doppler compensating means, at least a predetermined number of the power values of the outputs of all the detecting means. 6. The transmission / reception apparatus according to claim 5, wherein the detection of the target is determined based on whether or not is higher than a predetermined threshold. 8. A transmission device comprising: a selection unit for selecting any one of outputs of the detection unit; a plurality of transmission units transmitting radio waves having predetermined transmission frequencies different from each other; and the selection unit includes the transmission frequency. Selecting an output of the detecting means corresponding to the receiving means for processing the frequency band; a target detection determining means sequentially accumulating the outputs of the detecting means selected by the selecting means; 8. The method according to claim 5, wherein the detection of the target is determined based on the output.
The transmission / reception device according to the item. 9. A step of transmitting radio waves in a predetermined frequency band, receiving radio waves transmitted and reflected to a target, and signals received for each frequency band obtained by dividing the predetermined frequency band by a predetermined number. And phase coherent integration of the respective phase-detected signals for each Doppler cell, detecting each coherently integrated signal for each Doppler cell, and the corresponding relationship of the Doppler cell between each frequency band. A transmission / reception method comprising: a step of specifying; and a step of executing target detection determination based on a signal after detection for each same Doppler cell specified by a correspondence relationship between the specified Doppler cells.