JP4302750B2 - Combined mode radar device - Google Patents

Description

  The present invention relates to a technical field of an on-vehicle radar device using radio waves, and particularly to a technical field of a composite mode radar device using a plurality of frequency band modes.

  Many techniques have already been disclosed for the function of measuring position data such as the distance and angle to an object using radio waves, that is, the radar function. For example, a radar using a pulse repeatedly transmitted monotonously as a distance measuring function is known. In addition, as radar using continuous wave (CW: Continuous Wave), Doppler radar that detects the speed using a continuous wave of a single frequency, or ranging and speed detection using a band of several tens to 200 MHz An FMCW (Frequency Modulated Continuous Wave) radar is known (Patent Document 1).

  As a method for calculating an angle from a received wave received by an antenna, a monopulse method has been widely used. In this method, for example, two receiving antennas provided on the left and right sides are used, and an angular displacement therefrom is obtained from two received waves received by each using the vertical bisector of the two receiving antennas as a reference.

  The conventional radar system uses a system that simply detects the amplitude and phase of a signal returned by outputting a tone signal, or an FMCW system that sequentially changes the frequency in a narrow band up to 200 MHz in time series. Yes. In such a system that performs distance measurement or angle measurement using a narrow-band radio wave, since the distance resolution is low, for example, when the object is at a short distance of 10 m or less, sufficient detection accuracy cannot be obtained. There was a problem. Conventionally, the millimeter wave radar in the 76 GHz band used for in-vehicle use is a radar suitable for detecting a distance and an angle with respect to a vehicle about 100 m ahead.

  On the other hand, UWB (Ultra Wide Band) radar, which is an ultra-wideband wireless system using a bandwidth of 450 MHz to several GHz, is known as a new concept wireless communication technology in recent years, and is particularly attracting attention as an in-vehicle short-range radar. Has been.

  UWB is an impulse radio system using an ultra-short pulse wave having a pulse width of about nanoseconds or less by making a wide band available. In a radar system using a pulse, a higher resolution can be obtained as the pulse width becomes narrower. Therefore, a high-performance ranging function and an angle measuring function can be realized by using UWB. On the other hand, when the amplitude is constant, by reducing the pulse width, the average transmission power is reduced and the reach distance is shortened. From this, it can be said that UWB is a suitable method for measuring a short distance with high resolution.

  In a UWB wireless system, after transmitting an impulse from a UWB wave transmission source, by measuring the time from when the impulse is reflected by a predetermined object surface and received again by the transmission source, the object and the UWB wave transmission source Can be measured with high accuracy. In the case of measuring the angle, a reflected wave of one impulse is received by, for example, two receiving antennas, and can be calculated using the monopulse method.

  In the UWB wireless system, in the quasi-millimeter wave band of 22 to 29 GHz, an ultrashort pulse wave signal is generated using a wide band of 450 MHz to several GHz, and a conventional radar system using a narrow-band radio wave is sufficient. A high detection accuracy can be obtained in a short-distance measurement of 10 m or less in which a high accuracy was not obtained. For example, an object within about 10 m can be detected with high accuracy of several tens of centimeters.

  On the other hand, since the UWB radio system uses a wideband frequency, there is a possibility that interference with other radio systems may become a problem. To prevent this, it is necessary to use the UWB signal with a very low output. . Therefore, development of a radar apparatus used for measuring a short distance while keeping the output of the UWB signal low is underway.

Also, studies are being made on a composite mode radar that performs short-range measurement using UWB signals and long-range measurement using narrow-band signals. For example, in Europe, a combination of a narrowband mode Doppler radar using a narrowband signal in the SRD band and a wideband mode UWB radar using a wideband signal obtained by spectrum spreading at the same frequency as the narrowband signal. Mode radar has been studied (Non-Patent Document 1).
Japanese Patent Laid-Open No. 11-271430 Th. Wixforth, W. Ritschel, “Multimode-Radar-Technologie fur 24 GHz,“ auto & elektronik, vol.3 / 2004, pp.56-58

  However, conventionally, there has been no radar function for detecting the direction (angle measurement) by coordinating the narrowband mode and the broadband mode with a single device. Further, in the composite mode radar described in Non-Patent Document 1, since the frequency band used in the narrowband mode and the frequency band used in the wideband mode are the same or shared, both functions of the narrowband radar and the UWB radar are used. Cannot be used at the same time, and both are switched in a time-sharing manner.

  Therefore, both modes cannot be used simultaneously. For example, angle detection is performed with high accuracy in a narrow angle range up to a long distance using a narrowband radar, and angle detection is performed over a wide angle range in a short distance using a broadband radar. Advanced usage such as, could not be realized.

  Accordingly, the present invention has been made to solve the above-described problem, and is a composite mode radar that realizes a high-performance and high-functional angle measuring means by integrating and operating a narrowband radar and a broadband radar. An object is to provide an apparatus.

According to a first aspect of the combined mode radar apparatus of the present invention, a narrowband signal generator for generating a narrowband signal having a first frequency as a center frequency, and a second frequency different from the first frequency as a center frequency. A wideband signal generating unit that generates a wideband signal whose band does not overlap with the frequency band of the narrowband signal, and the narrowband signal and the wideband signal are input and transmitted from the narrowband signal generating unit and the wideband signal generating unit, respectively. A transmission antenna that receives the reflected waves from the two directions of each of the narrowband signal and the wideband signal, and the two-direction received waves received by the reception antenna, A signal synthesizer that calculates a sum signal obtained by adding received waves in two directions and a difference signal obtained by subtracting the received waves in two directions; and the sum signal and the signal from the signal synthesizer A narrowband reception processing unit that inputs a signal, detects a sum signal and a difference signal of the reflected wave of the narrowband signal and outputs narrowband detection data therefrom, and outputs the sum signal and the difference signal from the signal synthesis unit A wideband reception processing unit that detects a sum signal and a difference signal of reflected waves of the wideband signal and outputs wideband detection data; and the narrowband detection processing unit and the narrowband reception processing unit, respectively. A calculation unit that inputs data and the broadband detection data, detects each reflected wave by a monopulse method, and determines a detection angle from each detected reflected wave, and further, the narrowband reception processing A first filtering unit that filters a sum signal and a difference signal in a band substantially equal to the narrowband signal from the sum signal and the difference signal input from the signal synthesis unit; The broadband reception processing unit, characterized in that it comprises a second slag Namib for filtering the sum and difference signals of substantially equal bandwidth and the wideband signal from the sum signal and the difference signal inputted from the signal combining unit And

In another aspect of the composite mode radar apparatus of the present invention, the transmission antenna is a shared-band transmission antenna that can be shared for transmission of the narrowband signal and transmission of the wideband signal .

In another aspect of the composite mode radar apparatus of the present invention, the transmission antenna includes a narrowband transmission antenna that transmits the narrowband signal and a wideband transmission antenna that transmits the broadband signal .

In another aspect of the composite mode radar device of the present invention, the first frequency and the second frequency are any of 22 GHz and 29 GHz .

In another aspect of the composite mode radar device of the present invention, the wideband signal is a UWB signal having a bandwidth of at least 450 MHz .

  As described above, according to the present invention, it is possible to provide a composite mode radar device that realizes a high-performance and high-function angle measuring means by integrating and operating a narrowband radar and a broadband radar. It becomes. According to the present invention, by combining a narrow-band radar capable of detecting an angle with a high accuracy in a narrow angle range up to a long distance and a broadband radar capable of detecting an angle in a wide angle range of a short distance, It is possible to detect angles up to a distance with high performance.

  A composite mode radar apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. Each component having the same function is denoted by the same reference numeral for simplification of illustration and description.

  The composite mode radar apparatus of the present invention is configured so that both radar functions can be used simultaneously by dividing so that the frequency band used by the narrowband radar and the frequency band used by the wideband radar do not overlap. . An example of the frequency band used in the composite mode radar apparatus of the present invention is shown in FIG. In the figure, (a) shows the frequency band used in the composite mode radar apparatus of the present invention, and (b) shows the frequency band used in the composite mode radar apparatus studied in Europe described in Non-Patent Document 1. Show.

  In the combined mode radar device described in Non-Patent Document 1, as shown in FIG. 2B, the center frequency of the signal used for the narrowband radar and the center frequency of the signal used for the wideband radar are both about 24 GHz in the same SRD band. Therefore, the narrow band radar band 13 and the wide band radar band 14 overlap. For this reason, narrowband radar and broadband radar cannot be used at the same time, and it has been necessary to switch between the two as required.

  On the other hand, in the combined mode radar device of the present invention, in the high frequency band of 22 GHz or more and 29 GHz or less, the band is set so that the narrow band signal and the broadband signal do not overlap each other. As an example, in FIG. 2A, the first frequency that is the center frequency of the narrow-band radar is set to 24.125 GHz, for example, and the second frequency that is the center frequency of the broadband radar is set to 26.5 GHz, for example. Further, the bandwidth of the narrowband signal is set to 200 MHz or less, while the wideband signal is set to the UWB signal, and the bandwidth is set to at least 450 MHz.

  As described above, in the combined mode radar apparatus of the present invention, the narrowband radar band 11 and the wideband radar band 12 are set so as not to overlap each other, so that they are used in cooperation without switching. It is possible. In order to perform angle measurement using such a narrowband signal and a wideband signal, the composite mode radar apparatus of the present invention processes the reflected wave of each signal using a monopulse system.

  The basic configuration of the composite mode radar apparatus according to the first embodiment of the present invention will be described with reference to the block diagram shown in FIG. The combined mode radar apparatus 100 of the present embodiment is configured such that the narrowband radar unit 102 and the wideband radar unit 103 are provided in the same casing, and both operate cooperatively under the control of the calculation unit 101. ing. Both the data measured by the narrowband radar unit 102 and the wideband radar unit 103 are input to the calculation unit 101 so that the calculation unit 101 can measure the angle with high accuracy based on the detection data input from both. Yes.

  As an antenna for transmitting and receiving a narrowband signal and a wideband signal, the present embodiment includes a narrowband transmission antenna 151, a wideband transmission antenna 152, and shared reception antennas 153a and 153b that are spaced apart from each other on the left and right. In order to perform angle detection using the monopulse system, two common receiving antennas 153a and 153b are provided on the left and right sides, thereby receiving a reflected wave in two directions.

  The narrowband radar unit 102 uses a narrowband signal having a first frequency as a center frequency for angle measurement, and receives the narrowband signal from the shared reception antennas 153a and 153b and the narrowband signal generation unit 110 that generates the narrowband signal. And a narrowband reception processing unit 130 that inputs a signal and acquires detection data. The wideband radar 103 uses a wideband signal having the second frequency as the center frequency for angle measurement. The wideband signal generation unit 120 that generates the narrowband signal and the reception signals from the common reception antennas 153a and 153b are used. And a broadband reception processing unit 140 that inputs and acquires detection data.

  The narrowband signal generation unit 110 is provided with a narrowband wave source 111, and the narrowband signal generated here is amplified by the amplifier 112 and then transmitted from the narrowband transmission antenna 151. Here, a VCO (Voltage Controlled Oscillator) is used as the narrowband wave source 111. In the present embodiment, FMCW is used as a narrowband signal, and a continuous wave that is frequency-modulated using a VCO is generated.

  The radar function using FMCW uses a continuous wave whose frequency is sequentially changed in time series. When this is reflected and received by a distant object, the frequency becomes high, and when it is reflected by a nearby object. Measurements are made using characteristics such as lower frequency. The FMCW performs frequency modulation using a triangular wave control signal as shown in FIG. In order to generate such a triangular wave control signal, a triangular wave generator 104 is provided in the present embodiment.

  The triangular wave generator 104 outputs a triangular wave control signal as shown in FIG. 3 to the VCO that is the narrowband wave source 111 according to the control value set in advance from the arithmetic unit 101. The VCO generates a high frequency radio wave having a frequency modulated into a triangular wave according to the control signal input from the triangular wave generator 104, and outputs this as a narrow band wave. The frequency modulation width (bandwidth) using the triangular wave control signal is as small as about 20 MHz, and the signal generated by the narrowband signal generator 110 is a narrowband signal.

  A switch 113 is provided so that the narrowband signal generated by the narrowband wave source 111 and amplified by the amplifier 112 is output to the narrowband transmission antenna 151 in accordance with control from the calculation unit 101. The narrowband signal is a continuous wave, and it is not preferable for the radar function to keep transmitting the signal constantly. That is, if a continuous-band narrowband signal is always output, a part of the narrowband signal is directly received by the receiving antennas 153a and 153b due to the wraparound, and the receiving circuit is saturated and cannot be measured. Therefore, by providing the switch 113, only when there is a transmission request from the arithmetic unit 101, this is closed and a narrowband signal is transmitted from the narrowband transmission antenna 151.

  On the other hand, the broadband signal generator 120 is provided with a broadband wave source 121, which is configured to transmit a broadband impulse broadband signal generated here by the amplifier 122 and then transmitted from the broadband transmission antenna 152. ing. A burst oscillator (BO) can be used as the broadband wave source 121. When an impulse trigger, which is a request for transmitting a broadband signal, is input from the arithmetic unit 101, a high-frequency broadband impulse signal is oscillated in the burst oscillator for a period of about 1 ns. .

  The narrowband signal and the wideband signal generated by the narrowband signal generation unit 110 and the wideband signal generation unit 120 and transmitted from the transmission antennas 151 and 152 are reflected by an object within the measurement range and are received by the shared reception antennas 153a and 153b. Received. The received waves received by the common receiving antennas 153a and 153b are output to the signal synthesis unit 161 for processing in the monopulse system, and are received by the left receiving wave received by the common receiving antenna 153a and the common receiving antenna 153b. The right side received wave is synthesized.

  An angle detection method using the monopulse method will be described with reference to FIG. The two received waves received by the two left and right receiving antennas are partially overlapped and received as in the received waves 21 and 22 shown in FIG. When the sum and difference of the two received waves 21 and 22 are obtained, patterns 23 and 24 as shown in FIG. 4B are obtained. By dividing (normalizing) the difference between the two received waves from this, a monopulse curve 25 as shown in FIG. 4C is obtained. In the monopulse curve shown in the figure, the vertical axis represents the ratio of the sum and difference of two received waves, and the horizontal axis represents the angle. Using such a monopulse curve, the angle can be obtained from the ratio of the sum and difference of the two received waves.

  The sum signal and difference signal processed and output by the signal synthesis unit 161 are amplified by the amplifiers 162a and 162b, respectively, and then mixed with the narrowband signal generated by the narrowband signal generation unit 110 in the mixers 163a and 163b. The By mixing with the narrowband signal, the sum and difference signals are downconverted to baseband. Hereinafter, the sum signal down-converted by the mixer 163a is referred to as a low-frequency sum signal, and the difference signal down-converted by the mixer 163b is referred to as a low-frequency difference signal. The low frequency sum signal and the low frequency difference signal are demultiplexed and output to the narrowband reception processing unit 130 and the wideband reception processing unit 140.

  The narrowband reception processing unit 130 processes the input low-frequency sum signal and low-frequency difference signal by the low-pass filters (LPF) 131a and 131b, which are first filtering units, respectively, thereby reducing the bandwidth of the narrowband signal. Only the corresponding low frequency signal is filtered. When the bandwidth of the narrowband signal is 200 MHz, a filter that filters a signal of 200 MHz or less is used for the LPFs 131a and 131b. Hereinafter, the low frequency sum signal and the low frequency difference signal filtered by the LPFs 131a and 131b are referred to as a low frequency narrow band sum signal and a low frequency narrow band difference signal, respectively.

  The low-frequency narrowband sum signal and the low-frequency narrowband difference signal filtered by the LPFs 131a and 131b are amplified by the amplifiers 132a and 132b, respectively, and then detected by the S / H circuits 134a and 134b (hereinafter, narrowband detection). Data) is obtained, and this narrowband detection data is output to the calculation unit 101 and used for angle determination. The arithmetic unit 101 detects the angle using the monopulse curve as shown in FIG. 4 by the monopulse method based on the narrowband detection data input from the narrowband reception processing unit 130.

  Similarly, the wideband reception processing unit 140 processes the input low-frequency sum signal and low-frequency difference signal by the band-pass filters (BPF) 141a and 141b, which are the second filtering units, respectively, so that the first frequency and A broadband signal having the same frequency as the bandwidth of the broadband signal is filtered with a frequency corresponding to the difference from the second frequency as the center frequency. Hereinafter, the low frequency sum signal and the low frequency difference signal filtered by the BPFs 141a and 141b are referred to as a low frequency wide band sum signal and a low frequency wide band difference signal, respectively.

  The low-frequency wideband sum signal and the low-frequency wideband difference signal filtered by the BPFs 141a and 141b are amplified by the amplifiers 142a and 142b, respectively, and then detected by the detectors 143a and 143b. The impulse waves detected in each are output to the S / H circuits 144a and 144b, where detection data (hereinafter referred to as broadband detection data) is acquired. The broadband detection data acquired by the S / H circuits 144a and 144b is output to the calculation unit 101 and used for angle determination. The arithmetic unit 101 detects the angle using the monopulse curve as shown in FIG. 4 by the monopulse method based on the broadband detection data input from the broadband reception processing unit 140.

  The composite mode radar apparatus 100 of the present embodiment is configured to be able to operate the narrowband radar unit 102 and the broadband radar unit 103 in a coordinated manner under the control of the arithmetic unit 101, and is detected by the narrowband radar unit 102. It is possible to perform advanced angle measurement by combining the narrowband detection data and the broadband detection data detected by the broadband radar unit 103. As an example, the narrowband radar unit 102 and the wideband radar unit 103 can be used in basic operations as shown in FIG. 5, and by combining these basic operations, the narrowband radar unit 102 and the wideband radar unit 103 Thus, a suitable radar function can be realized.

  As the basic operation described above, a switching method in which the narrowband radar unit 102 and the wideband radar unit 103 shown in FIG. 5A are switched and operated as appropriate, and the narrowband radar unit 102 and the wideband radar unit shown in FIG. There are two types of parallel use systems in which 103 and 103 are operated in parallel. By using such a basic operation, it is possible to perform advanced angle detection.

  That is, in the angle detection with respect to an object at a short distance, measurement is performed using the broadband radar unit 103, and at the same time, the angle detection with respect to an object at a long distance is detected by using the narrow band radar unit 102. And the angle detection by the narrowband radar unit 102 can be performed in parallel.

  In order to avoid interference with other systems, for example, it is possible to use the narrowband radar unit 102, for example, and use the wideband radar unit 103 only when it is necessary to detect the vicinity with high accuracy. . Such a control method can be realized only by software processing of the arithmetic unit 101.

  A basic configuration of the composite mode radar apparatus according to the second embodiment of the present invention will be described with reference to a block diagram shown in FIG. In the combined mode radar apparatus 200 of the present embodiment, the narrowband signal generated by the narrowband signal generator 110 and the wideband signal generated by the wideband signal generator 120 are transmitted by the shared transmission antenna 251.

  In the first embodiment, the narrowband transmission antenna 151 for transmitting a narrowband signal and the wideband transmission antenna 152 for transmitting a wideband signal are provided independently, but in this embodiment, a shared reception antenna is provided. In addition to 153a and 153b, the transmission antenna is also replaced with a shared transmission antenna 251, thereby reducing the number of antennas and reducing the size of the composite mode radar device 200.

  In order to transmit narrowband signal transmission and broadband signal transmission by one shared transmission antenna 251, the combined mode radar apparatus 200 of this embodiment is configured to include a multiplexer 271 and a narrowband signal generator. The narrowband signal generated at 110 and the wideband signal generated by the wideband signal generator 120 are combined by a multiplexer 271 to form one transmission signal. The transmission signal combined by the multiplexer 271 is transmitted from the shared transmission antenna 251.

  Also in the composite mode radar device 200 of this embodiment, since the center frequency is separated so that the narrow band signal and the wide band signal do not overlap with each other, they are combined by the multiplexer 271 and shared transmission as one transmission signal. Even if the signals are transmitted from the antenna 251, there is no possibility of affecting each other. The reception signals transmitted as one transmission signal, reflected by the object and received by the shared reception antennas 153a and 153b are filtered by the LPFs 131a and 131b and the BPFs 141a and 141b, respectively, as in the first embodiment. It is configured to be waved. The subsequent processing in the narrowband reception processing unit 130 and the wideband reception processing unit 140 is the same as that in the first embodiment.

  A basic configuration of a composite mode radar device according to the third embodiment of the present invention will be described with reference to a block diagram shown in FIG. In the combined mode radar apparatus 300 of the present embodiment, both the transmission antenna and the reception antenna are provided independently for each of the narrowband signal and the wideband signal. For each narrowband signal and wideband signal, a transmission antenna and a reception antenna are provided independently, so that the measurement range measured using the narrowband signal and the measurement range measured using the wideband signal are set separately. be able to.

In FIG. 7, a narrowband receiving antenna (left) 353a and (right) 353b are provided to receive a reflected wave of a narrowband signal, and the received received wave is subjected to signal synthesis for processing in a monopulse system. To the unit 361 . The sum and difference signals processed and output by the signal synthesis unit 361 are input to the narrowband reception processing unit 330, where they are amplified by the amplifiers 362a and 362b and then down-converted to baseband by the mixers 363a and 363b. Is done.

Similarly, a broadband receiving antenna (left) 354 a and (right) 354 b are provided to receive the reflected wave of the broadband signal, and the received received wave is output to the signal synthesis unit 364 . The sum and difference signals processed and output by the signal synthesis unit 364 are input to the wideband reception processing unit 340, where they are amplified by the amplifiers 365a and 365b, and then down-converted to baseband by the mixers 366a and 366b. The

  In the present embodiment, a receiving antenna is provided independently for each of the narrowband radar unit 302 and the wideband radar unit 303, and each received wave is input independently to the narrowband reception processing unit 330 and the wideband reception processing unit 340. Because of the configuration, the amplifier for amplifying the sum signal and the difference signal processed by the signal synthesis unit and the mixer for down-converting the same are also independent of each of the narrowband reception processing unit 330 and the wideband reception processing unit 340. Provided.

  FIG. 8 shows an example in which the measurement range measured using the narrowband signal and the measurement range measured using the wideband signal are set separately. In the example shown in the figure, the measurement range 31 with a narrow angle up to a far distance is measured using a narrowband signal, and the measurement range 32 with a wide angle at a short distance is set to be measured using a wideband signal.

The radar function using the narrowband signal by the narrowband radar unit 302 can measure the angle in a narrow angular range at a long distance with high accuracy, and the radar function using the wideband signal by the wideband radar unit 303. Can measure angles in a wide range of angles in a short distance, so that the measurement ranges of the narrowband radar unit 302 and the wideband radar unit 303 are, for example , measurement ranges 31 and 32 shown in FIG. It is preferable to set.

  When the measurement ranges of the narrowband radar unit 302 and the wideband radar unit 303 are set to different areas as shown in FIG. 8, for example, the transmission direction and the reception direction of each are different. It is necessary to provide the antenna used for the narrow band radar unit 302 and the antenna used for the wide band radar unit 303 independently.

  By providing a transmission / reception antenna independently for each of the narrowband radar unit 302 and the wideband radar unit 303, the wide angle range is detected at a rough angle using the wideband radar unit 303 in the angle detection at a short distance, In the angle detection at a long distance, the angle detection by the wideband radar unit 303 and the angle detection by the narrowband radar unit 302, such as detecting a narrow angle range with high accuracy using the narrowband radar unit 302, can be performed in parallel. It becomes possible.

  In order to avoid interference with other systems, for example, angle detection is usually performed using the narrowband radar unit 302, and the broadband radar unit 303 is used only when it is necessary to detect the vicinity in a wide range. Is also possible. Such a control method can be realized only by software processing of the arithmetic unit 101.

  As described above, according to the present invention, it is possible to provide a composite mode radar apparatus that can process the narrowband angle measurement function and the wideband angle measurement function in an integrated manner. Further, according to the present invention, it is possible to detect the azimuth of an object according to the usage form, such as detecting a wide range in the vicinity with rough angular accuracy, and a remote location in a narrow angle with high accuracy. Furthermore, according to the present invention, when there is a possibility of interference with other systems in a wideband radar, the utilization time ratio is reduced, and angle measurement is realized by a narrowband radar that can easily avoid mutual interference. It is possible to realize a countermeasure against interference.

  Note that the description in the present embodiment shows an example of the composite mode radar apparatus according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of the combined mode radar device in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

1 is a block diagram of a composite mode radar device according to a first embodiment of the present invention. It is a figure which shows an example of the frequency band used with the compound mode radar apparatus of this invention. It is a figure which shows an example of the frequency modulation signal used for the modulation | alteration of a narrowband signal. It is a figure explaining the detection method of the angle using a monopulse system. It is a figure which shows the basic operation | movement of a narrowband radar part and a wideband radar part. It is a figure which shows the block diagram of the compound mode radar apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the block diagram of the compound mode radar apparatus which concerns on the 3rd Embodiment of this invention. It is a figure which shows the example from which the measurement range by a narrowband radar part differs from the measurement range by a wideband radar part.

Explanation of symbols

11, 13 Narrowband radar band 12, 14 Wideband radar band 25 Monopulse curve 100, 200, 300 Combined mode radar device 101 Arithmetic unit 102, 302 Narrowband radar unit 103, 303 Wideband radar unit 104 Triangular wave generator 110 Narrowband Signal generator 111 Narrowband wave source 112, 122, 132, 142, 162, 362, 365 Amplifier 113 Switch 120 Wideband signal generator 121 Wideband wave source 130, 330 Narrowband reception processor 131 First filter (LPF)
134, 144 S / H circuit 140, 340 Wideband reception processing unit 141 Second filtering unit (BPF)
143 Detector 151 Narrowband transmission antenna 152 Wideband transmission antenna 153 Shared reception antenna 161, 361, 364 Signal combiner 162 Amplifier 163, 363, 366 Mixer 251 Shared transmission antenna 271 Multiplexer 353 Narrowband reception antenna 354 Wideband reception antenna

Claims (5)

A narrowband signal generator for generating a narrowband signal centered on the first frequency;
A wideband signal generator for generating a wideband signal having a second frequency different from the first frequency as a center frequency and a frequency band not overlapping the frequency band of the narrowband signal;
A transmitting antenna for inputting and transmitting the narrowband signal and the wideband signal from the narrowband signal generator and the wideband signal generator, respectively;
A band-sharing receiving antenna that receives both reflected waves from two directions of the narrowband signal and the wideband signal;
A signal synthesizer for inputting a received wave in two directions received by the receiving antenna, and calculating a sum signal obtained by adding the received waves in the two directions and a difference signal obtained by subtracting the received waves in the two directions;
A narrowband reception processing unit that inputs the sum signal and the difference signal from the signal synthesis unit, detects a sum signal and a difference signal of the reflected wave of the narrowband signal, and outputs narrowband detection data;
A broadband reception processing unit that inputs the sum signal and the difference signal from the signal synthesis unit, detects a sum signal and a difference signal of reflected waves of the broadband signal, and outputs broadband detection data;
The narrowband detection data and the wideband detection data are input from the narrowband reception processing unit and the wideband reception processing unit, respectively, the reflected waves are detected by a monopulse method, and detected from the detected reflected waves. An arithmetic unit for determining an angle,
Further, the narrowband reception processing unit includes a first filtering unit that filters a sum signal and a difference signal in a band substantially equal to the narrowband signal from the sum signal and the difference signal input from the signal synthesis unit. Prepared,
The broadband reception processing unit includes a second filtering unit that filters a sum signal and a difference signal in a band substantially equal to the broadband signal from the sum signal and the difference signal input from the signal synthesis unit. A combined mode radar device. The combined mode radar device according to claim 1, wherein the transmission antenna is a shared-band transmission antenna that can be shared for transmission of the narrowband signal and transmission of the wideband signal . The combined mode radar apparatus according to claim 1 , wherein the transmission antenna includes a narrowband transmission antenna that transmits the narrowband signal and a wideband transmission antenna that transmits the wideband signal . 4. The composite mode radar device according to claim 1, wherein the first frequency and the second frequency are any of 22 GHz and 29 GHz . 5. 5. The combined mode radar device according to claim 1 , wherein the wideband signal is a UWB signal having a bandwidth of at least 450 MHz . 6.

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