JP2010190831A - Wideband radar device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wideband radar device capable of accurately detecting targets at a distance. <P>SOLUTION: The wideband radar device includes: a reception clock generation unit 115 for generating reception clock signals where the period of signals to be generated becomes smaller continuously or in steps; a gate pulse signal generation unit 221 for generating gate pulse signals in synchronization with the reception clock signals; a detection unit 222 for output of reception pulse detection signals by detecting reception pulse signals obtained by receiving reflection waves of UWB transmission pulse signals by a reception antenna 210 for a certain period when the signal level of the gate pulse signal is at a prescribed level for output of reception pulse detection signals; an integration unit 223 for integrating the reception pulse detection signals detected by the detection unit 222 for taking out signals; a time sensitivity control unit 241 for performing time sensitivity control by integrating signals taken out by the integration unit 223 by a coefficient for correcting the amount of attenuation of the signal level; and a difference calculation unit 242 for detecting travel of a target by calculating the difference between signals of which the signal level has been corrected for each prescribed amount of time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a broadband radar apparatus. In particular, the present invention relates to a broadband radar that detects the position of a target such as a moving object (hereinafter referred to as a target) with high accuracy by transmitting / receiving an ultra-wideband (hereinafter abbreviated as UWB: Ultra-Wide Band) radio wave. Relates to the device.

2. Description of the Related Art A broadband radar device that outputs an ultra-wideband radio wave to a target or the like and detects the position (distance, azimuth, height) of the target from a reflected wave with high accuracy is known. A broadband radar apparatus using UWB radio waves can perform highly accurate position evaluation with ultra-high range resolution. In addition, UWB radio waves have a property of passing through non-metals (attenuation media) such as concrete and wood when the frequency of the radio waves includes a low band of several GHz or less. Utilizing these two features, application of the wideband radar apparatus to various apparatuses has been studied.
For example, the following broadband radar apparatuses that take advantage of two characteristics of ultra-high range resolution and attenuation medium permeability are being studied.
UWB radar (wall penetration radar, through wall radar) that detects the movement of unauthorized intruders in buildings and rooms through walls
UWB radar (forest transmission radar, foliage transmission radar, FOPEN radar (Foliage Penetration Radar)) that detects the movement of dangerous animals lurking in the forest through the plantation and planting
UWB radar (survivor detection radar) that detects survivors buried under rubble or earth and sand
UWB radar (security gate detection radar) that detects whether an intruder in a facility is hiding a dangerous object
UWB radar (collision prevention radar) that is installed inside the front of a car and measures the distance from a non-metallic bumper, a car that runs ahead through a front grille, a car that stops, and the walls of a parking lot with high accuracy.

  In a broadband radar apparatus using UWB radio waves, a method called equivalent time sampling is used to reproduce a waveform of a reflected wave from a target. Equivalent time sampling is a method in which sampling is performed at a time offset by a fixed time for each period with respect to a response wave of a transmission pulse signal transmitted toward a target. Sampling is performed from the reflected waves of a plurality of transmission pulse signals, and the waveform of the reflected wave is reproduced on the time axis. FIG. 1 shows how the reflected wave of the transmission pulse signal is reproduced by sampling at a time offset by Δt time every cycle.

  Patent Document 1 discloses a technique for detecting a peak position of a reflected wave reflected by an object and performing sampling by setting a sampling interval of reflected waves in a range in the vicinity of the peak position densely.

Japanese Patent No. 3433718

The reproduction performance of the reflected wave waveform can be improved by increasing the number of samplings. However, in the equivalent time sampling, the number of times of sampling for reproducing the reflected wave for one period of the transmission pulse signal is always constant. For this reason, when the distance between the broadband radar apparatus and the target is increased, the signal level of the reflected wave from the target is reduced, the noise component is increased, and the reproduction performance of the reflected wave waveform is degraded.
FIG. 2A shows an example of a signal waveform of a UWB transmission pulse signal transmitted from the transmission apparatus. FIG. 2B shows an example of a waveform of a reception pulse signal obtained by receiving a transmission pulse signal reflected by the target with a reception device. FIG. 2C shows an example of the waveform of the received pulse detection signal indicating the timing at which the received received pulse signal is captured and detected. FIG. 2D shows a signal waveform of a baseband signal extracted by performing signal processing such as detection and integration on the received pulse signal. FIG. 2E shows a waveform of a signal obtained by performing time sensitivity control for correcting the attenuation of the signal level of the baseband signal on the baseband signal. Note that because of equivalent time sampling, the period of the received pulse detection signal shown in FIG. 2C is increased by a certain time (Δf shown in FIG. 2C) for each period of the transmission pulse signal. Yes. In addition, it can be seen that the baseband signal subjected to the time sensitivity control shown in FIG. 2E increases in noise as the distance from the broadband radar apparatus to the target increases.

  Further, the disclosed technique of Patent Document 1 is not a technique related to equivalent time sampling, but increases the number of samplings at a position where the signal level of the reflected wave is a peak.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a broadband radar apparatus that can accurately detect a target at a distance.

The wideband radar apparatus disclosed in this specification includes a transmission clock generation unit that generates a transmission clock signal having a constant period, a pulse generation unit that generates a pulse signal synchronized with the transmission clock signal, and a pulse generation unit that generates the transmission clock signal. A transmission antenna that radiates a pulse signal to a target area, a reception antenna that receives a reflected wave of the pulse signal transmitted from the transmission antenna as a reception pulse signal, and a period of a signal to be generated continuously or in stages Receiving clock signal generating means for generating a receiving clock signal that becomes smaller, gate pulse signal generating means for generating a gate pulse signal synchronized with the receiving clock signal, and the received pulse signal received by the receiving antenna as the gate pulse signal. Detection during the period when the signal level of the signal is at a predetermined level and detecting the received pulse detection signal Means, integrating the received pulse detection signal detected by the detection means and integrating the signal, and integrating the coefficient extracted for the attenuation of the signal level to the signal extracted by the integration means to perform time sensitivity control. Time sensitivity control means to perform, and a difference calculation means for calculating a difference for each predetermined time of the signal whose signal level is corrected to detect the movement of the object.
Therefore, according to the wideband radar device disclosed in this specification, even when the distance to the target is far and the signal level of the received pulse signal reflected by the target is reduced, the sampling frequency of the received pulse signal is reduced. By increasing it, it is possible to prevent a decrease in signal level.

  According to the broadband radar device disclosed in the present specification, it is possible to accurately detect a target at a distance.

It is a figure for demonstrating equivalent time sampling. It is a figure which shows the waveform of the transmission pulse signal output from the conventional broadband radar apparatus, and the waveform of the signal which received and processed the reflected wave reflected by the target with a broadband radar apparatus. 1 is a block diagram illustrating a configuration of a broadband radar apparatus according to a first embodiment. It is a figure which shows the signal waveform processed in the broadband radar apparatus of Example 1, (A) shows the waveform of a UWB transmission pulse signal, (B) shows the waveform of the received UWB reception pulse signal, (C) Shows the waveform of the UWB gate pulse signal, (D) shows the waveform of the received pulse detection signal, (E) shows the waveform of the baseband signal, and (F) shows the time sensitivity control signal with the signal level corrected. The waveform is shown. It is a figure which shows the relationship between the input electric power input into a detection part, and the detection voltage output from a detection part. It is a figure which shows the hardware constitutions of a process part. (A) shows the waveform of the digital baseband signal input to the time sensitivity control unit, (B) shows an example of the STC coefficient table recorded in the RAM, and (C) shows the baseband signal. It is a figure which shows the waveform of the baseband signal which multiplied the STC coefficient and correct | amended the signal level. It is a figure for demonstrating the method to detect a moving object component from a baseband signal. It is a flowchart which shows the process sequence of a time sensitivity control part. It is a block diagram which shows the structure of the wideband radar apparatus of Example 2. FIG. It is a block diagram which shows the structure of the wideband radar apparatus of Example 3. It is a block diagram which shows the structure of the broadband radar apparatus of Example 4. FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  A broadband radar apparatus 1A according to the first embodiment will be described with reference to FIG. The broadband radar apparatus 1 </ b> A according to the present embodiment includes a control unit 110, a UWB pulse generation unit 120, and a transmission antenna unit 130 as the transmission side device 100. The receiving device 200 includes a receiving antenna unit 210, a receiving unit 220, a data editing unit 230, a processing unit 240, and a data display unit 250. Hereinafter, each part will be described.

  The control unit 110 includes a first reference clock generation unit 111, a transmission clock generation unit 112, a second reference clock generation unit 113, a time delay control unit 114A, a reception clock generation unit 115, and a reception trigger generation unit 116. It has.

  The first reference clock generation unit 111 generates a reference clock (hereinafter referred to as a transmission reference clock signal) for generating a UWB pulse signal used for target detection. The first reference clock generation unit 111 outputs the generated transmission reference clock signal to the transmission clock generation unit 112 and the time delay control unit 114A.

  The transmission clock generation unit 112 receives the transmission reference clock signal output from the first reference clock generation unit 111 and generates a transmission clock signal obtained by dividing or multiplying the transmission reference clock signal. The transmission clock generator 112 outputs the generated transmission clock signal to the reception trigger generator 116 and the UWB pulse generator 120.

  The second reference clock generation unit 113 generates a reference clock (hereinafter referred to as a reception reference clock signal) that is used by the reception unit 220 to receive the UWB pulse signal. The second reference clock generation unit 113 outputs the generated reception reference clock signal to the time delay control unit 114A.

  The time delay control unit 114A receives the transmission reference clock signal output from the first reference clock generation unit 111 and the reception reference clock signal output from the second reference clock generation unit 113. The time delay control unit 114A performs time delay control for continuously reducing the signal repetition period of the input reception reference clock signal. Further, the time delay control unit 114A determines a period in which the signal repetition period of the reception reference clock signal is continuously reduced based on the phases of the transmission reference clock signal and the reception reference clock signal. Details of this processing will be described in the description of the reception clock generation unit 115. The time delay control unit 114A outputs the reception reference clock signal adjusted so that the signal repetition period continuously decreases to the reception clock generation unit 115.

The reception clock generation unit 115 receives the reception reference clock signal output from the time delay control unit 114A. The reception clock generation unit 115 divides or multiplies the input reception reference clock signal to generate a reception clock signal.
For example, it is assumed that the signal repetition cycle of the transmission clock signal generated by the transmission clock generation unit 112 is 100 [ns]. The reception clock generator 115 receives the reception clock whose signal repetition period continuously changes from 100.0008 [ns] to 100.00005 [ns], for example, during 200 [ms] based on the reception reference clock signal. Generate a signal.
That is, at the beginning of the period of 200 [ms], the reception clock generation unit 115 generates a reception clock signal having a signal repetition period of 100.0008 [ns]. Thereafter, the reception clock generation unit 115 continuously decreases the signal repetition period of the reception clock signal. Then, at the end of the period of 200 [ms], the reception clock generation unit 115 generates a reception clock signal with a signal repetition period of 100.00005 [ns]. When 200 [ms] elapses, the reception clock generation unit 115 returns to the beginning and generates a reception clock signal with a signal repetition period of 100.0008 [ns]. The reception clock generation unit 115 outputs the generated reception clock signal to the gate pulse signal generation unit 221 and the reception trigger generation unit 116 of the reception unit 220. The period of 200 [ms] is determined by the time delay control unit 114A. The time delay control unit 114A determines a period for changing the signal repetition period of the reception clock signal based on the time from when the phases of the transmission reference clock signal and the reception reference clock signal match to the next match.

  The reception trigger generator 116 receives the transmission clock signal output from the transmission clock generator 112 and the reception clock signal output from the reception clock generator 115. The reception trigger generation unit 116 generates a trigger signal used by the data reading unit 231 of the data editing unit 230 to read data using the transmission clock signal and the reception clock signal. The reception trigger generation unit 116 generates a trigger signal whose signal level changes at the timing when the phase of the reception clock signal matches the phase of the transmission clock signal. The reception trigger generation unit 116 outputs the generated trigger signal to the data reading unit 231 of the data editing unit 230.

The UWB pulse generation unit 120 receives the transmission clock signal output from the control unit 110. The UWB pulse generation unit 120 outputs a UWB transmission pulse signal to the transmission antenna unit 130 in synchronization with the signal repetition period of the input transmission clock signal. For example, if the signal repetition period of the transmission clock signal is 100 [ns], the UWB pulse generation unit 120 outputs a UWB transmission pulse signal having a pulse repetition period of 100 [ns] to the transmission antenna unit 130.
The UWB transmission pulse signal is radiated from the transmission antenna unit 130 toward the target. FIG. 4A shows an example of a UWB transmission pulse signal radiated from the transmission antenna unit 30.

  The UWB transmission pulse signal radiated from the transmission antenna unit 130 is reflected by the target. The broadband radar apparatus 1 </ b> A receives the UWB transmission pulse signal reflected by the target by the reception antenna unit 210. An example of the waveform of the reflected wave of the UWB transmission pulse signal received by the receiving antenna unit 210 (hereinafter referred to as the UWB reception pulse signal) is shown in FIG. Since the UWB reception pulse signal is a reflected wave of the UWB transmission pulse signal reflected by the target, the reception antenna unit 210 repeatedly receives the UWB reception pulse signal every signal repetition period of the transmission clock signal.

  The reception unit 220 includes a gate pulse signal generation unit 221, a detection unit 222, an integration unit 223, and a baseband signal amplification unit 224.

  The gate pulse signal generation unit 221 inputs the reception clock signal generated and output by the reception clock generation unit 115 of the control unit 110. The gate pulse signal generator 221 generates a UWB gate pulse signal synchronized with the input reception clock signal. Since the continuous change from 100.0008 [ns] to 100.00005 [ns] is repeated at a time interval of 200 [ms] as the repetition period of the reception clock signal, the generation timing of the UWB gate pulse signal is the reception clock signal. Similarly, the change from 100.0008 [ns] to 100.00005 [ns] is repeated at a time interval of 200 [ms]. An example of the signal waveform of the UWB gate pulse signal is shown in FIG. The gate pulse signal generator 221 outputs the generated UWB gate pulse signal to the detector 222.

  The detection unit 222 inputs the UWB gate pulse signal output from the gate pulse signal generation unit 221 and the UWB reception pulse signal received by the reception antenna unit 210. The detector 222 is constituted by a detector using, for example, an S-band detection Schottky barrier diode. The detection unit 222 takes in a UWB reception pulse signal when the signal level of the UWB gate pulse signal is high, for example, and detects a detection voltage (output voltage) according to the input power level of the UWB reception pulse signal as shown in FIG. ) Is output. The detection voltage output from the detection unit 222 is output to the integration unit 223 as a received pulse detection signal. FIG. 4D shows an example of the signal waveform of the received pulse detection signal.

  The integrator 223 receives the UWB gate pulse signal output from the gate pulse signal generator 221 and the received pulse detection signal output from the detector 222. The integrator 223 integrates the input received pulse detection signal. Integration of the integration unit 223 is performed until the signal rising timing of the UWB gate pulse signal coincides with the start timing of the pulse repetition period of the UWB reception pulse signal (equivalent time sampling). That is, in the above-described example, the rising timing of the UWB gate pulse signal coincides with the start timing of the signal repetition cycle of the UWB reception pulse signal at a cycle of 200 [ms]. Therefore, the signal output from the integrating unit 223 is a signal whose time axis is extended to 2000000 times, and the signal cycle is 200 [ms]. The integrator 223 outputs the integrated UWB gate pulse signal to the baseband signal amplifier 224 as a baseband signal.

  The baseband signal amplifying unit 224 is composed of a device such as an operational amplifier, and receives and amplifies the baseband signal output from the integrating unit 223. An example of the baseband signal amplified by the baseband signal amplifier 224 is shown in FIG.

  The data editing unit 230 includes a data reading unit 231 and an AD conversion unit 232.

  The data reading unit 231 inputs the trigger signal generated by the reception trigger generation unit 116 of the control unit 110 and the baseband signal amplified by the baseband signal amplification unit 224. The data reading unit 231 reads the baseband signal in accordance with the rising timing or falling timing of the trigger signal. The baseband signal read by the data reading unit 231 is output to the AD conversion unit 232.

The AD conversion unit 232 receives the analog baseband signal output from the data reading unit 231 and performs AD conversion. For example, if the sampling rate of AD conversion is 3000 [samples / second], the data is 600 samples per 200 [ms] of the baseband signal. Since the pulse repetition frequency of the UWB transmission pulse signal is 10 MHz, the maximum detection distance is 15 m (light speed 3 × 10 ⁸ [m / s] × 10 [MHz] × 2), and the distance resolution is 0.025 [m. ] Is a digital signal. The AD conversion unit 232 outputs the AD converted digital baseband signal to the processing unit 240.

The processing unit 240 includes a time sensitivity control unit 241 and a difference calculation unit 242. The processing unit 240 is realized by a cooperative operation of hardware and software. The processing unit 240 includes a CPU 260, a ROM 261, a RAM 262, an input / output unit 263, and a graphic interface 264 shown in FIG. 6 as hardware. When the CPU 260 reads the software recorded in the ROM 261 and executes control according to the read software, the time sensitivity control unit 241 and the difference calculation unit 242 shown in FIG. 3 are realized. The RAM 262 stores data used by the CPU 260 for calculation. For example, data of STC (Sensitivity Time Control) coefficient described later is recorded. In addition, the input / output unit 263 outputs data input from the data editing unit 230 to the CPU 260 and outputs data processed by the CPU 260 to an external device.
The graphic interface 264 is an interface for displaying the data processed by the CPU 260 on the display of the data display unit 250, and converts the graphic data into a waveform electric signal in order to display the graphic data on the display.

The time sensitivity control unit 241 performs time sensitivity control on the digital baseband signal output from the AD conversion unit 232 to generate a time sensitivity control signal.
In the time sensitivity control, for example, the STC coefficient set corresponding to the signal arrival time (distance) from the transmission of the UWB transmission pulse signal to the reception of the UWB reception pulse signal is set to the digital baseband signal. Multiply processing. FIG. 7A shows a signal waveform of a digital baseband signal. FIG. 7B shows an example of a table in which STC coefficients to be multiplied with the baseband signal are recorded. This table is recorded in the RAM 261 shown in FIG. FIGS. 4F and 7C show an example of the waveform of the baseband signal after time sensitivity control in which the baseband signal is multiplied by the STC coefficient to correct the signal level. Since the signal level of the UWB transmission pulse signal attenuates according to the distance when propagating in the atmosphere, the STC coefficient is set to a coefficient that corrects the attenuation corresponding to the propagation distance of the UWB transmission pulse signal. Yes. The time sensitivity control unit 241 outputs the baseband signal subjected to time sensitivity control to the difference calculation unit 242.

  The difference calculation unit 242 receives the baseband signal output from the time sensitivity control unit 241. The difference calculation unit 242 obtains a difference between the baseband signal acquired this time from the time sensitivity control unit 241 and the previously acquired baseband signal, and detects a moving object component based on the difference between the baseband signals. FIG. 8A shows the signal waveform of the baseband signal at a certain sampling time t1. FIG. 8B shows a signal waveform of the baseband signal at the next sampling time t2. Further, FIG. 8C shows a signal waveform of the baseband signal at the next sampling time t3. For example, as shown in FIG. 8D, the difference calculation unit 242 obtains a difference between the baseband signals at time t1 and time t2. Further, as shown in FIG. 8E, the difference between the baseband signals at time t2 and time t3 is obtained. By obtaining the difference between the baseband signals in this way, the response component from the stationary object is eliminated, and only the response component from the moving object is detected. The difference calculation unit 242 (CPU 260) outputs the detected moving body component to the data display unit 250. The data display unit 250 includes a display, and displays the moving body component of the baseband signal output from the difference calculation unit 242.

Here, the processing procedure of the time delay control unit 114A will be described with reference to the flowchart shown in FIG.
First, the time delay control unit 114A inputs the transmission reference clock signal generated by the first reference clock generation unit 111 and the reception reference clock signal generated by the second reference clock generation unit 113 (step S1). When these signals are input (step S1 / YES), the time delay control unit 114A generates a reception reference clock signal in which the signal repetition period of the input reception reference clock signal continuously decreases according to the elapsed time. (Step S2). The time delay control unit 114 </ b> A outputs the generated reception reference clock signal to the reception clock generation unit 115. For example, the reception clock generation unit 115 generates a reception clock signal whose repetition period continuously changes from 100.0008 [ns] to 100.00005 [ns] based on the input reception reference clock signal.

  Next, the time delay control unit 114A compares the phases of the transmission reference clock signal input from the first reference clock generation unit 111 and the reception reference clock signal input from the second reference clock generation unit 113 (step S3). When the phases of the reception reference clock signal and the transmission reference clock signal match (step S3 / YES), the time delay control unit 114A sets the repetition cycle of the generated reference clock signal to the initial state (100.0008 [ns]). Return (step S4). When the phase of the reception reference clock signal and the transmission reference clock signal do not match (step S3 / NO), the time delay control unit 114A repeats the process of step S2. If the transmission reference clock signal and the reception reference clock signal cannot be input (step S1 / NO), this process is terminated.

  As described above, in this embodiment, the signal repetition period of the reception reference clock signal is continuously reduced every predetermined period. For this reason, the repetition cycle of the reception clock signal that defines the sampling interval of the received UWB reception pulse signal can also be set to be continuously reduced within a predetermined interval. Therefore, even when the distance to the target is long and the signal level of the reflected wave becomes small, the number of sampling times of the received UWB reception pulse signal can be increased to prevent the signal level from being lowered. For this reason, even when the target is far away from the broadband radar apparatus, the accuracy of target detection can be improved without the reflected signal from the target being buried in noise.

A broadband radar apparatus according to a second embodiment will be described with reference to the accompanying drawings.
FIG. 10 shows the configuration of the broadband radar apparatus 1B of the second embodiment. In addition, the same code | symbol is attached | subjected to the component same as the broadband radar apparatus 1A of Example 1, and the description is abbreviate | omitted.
In this embodiment, as shown in FIG. 10, a stepwise time delay control unit 114B is provided instead of the time delay control unit 114A. The stepwise time delay control unit 114B performs control to delay the signal repetition period of the reception reference clock signal generated by the second reference clock generation unit 113 in steps at regular time intervals. For example, in the first embodiment described above, the reception clock signal is continuously changed from 100.0008 [ns] to 100.00005 [ns] during 200 [ms]. In the embodiment, every 40 [ms] out of 200 [ms], the period of the received clock signal is 100.0008 [ns], 100.0004 [ns], 100.0002 [ns], 100.001 [ns]. ] Is gradually reduced to 100.00005 [ns].

  As described above, in this embodiment, since the repetition cycle of the reception reference clock signal (reception clock signal) is controlled to be small in steps at regular time intervals, time delay control is facilitated. In addition, even when the target is far away from the broadband radar apparatus 1B as in the first embodiment, the accuracy of target detection can be improved without the reflected signal from the target being buried in noise.

A broadband radar apparatus according to a third embodiment will be described with reference to the accompanying drawings.
FIG. 11 shows the configuration of a broadband radar apparatus 1C according to the third embodiment. In the present embodiment, the same components as those in the broadband radar apparatus 1A of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, a time delay control unit 114C for each distance is provided in place of the time delay control unit 114A of the first embodiment. The distance-based time delay control unit 114C receives the reception reference clock signal generated by the second reference clock generation unit 103, and the sampling number increases in proportion to the fourth power of the distance to the target according to the distance to the target. A reception clock signal in which a signal repetition period is set is generated.
The intensity of radio waves attenuates in the atmosphere in proportion to the fourth power of distance. Therefore, the time delay control unit 114C for each distance sets the signal repetition period of the reception reference clock signal so that the number of samplings increases in proportion to the fourth power of the distance to the target.
Since the repetition cycle of the reception reference clock signal is set so that the number of samplings increases in proportion to the fourth power of the distance to the target, the noise component of the signal subjected to time sensitivity control is constant regardless of the distance to the target. Become. Therefore, even if the target is far away from the broadband radar apparatus 1C, the target reflected signal is not buried in noise, and the accuracy of target detection can be improved.

A broadband radar apparatus according to a fourth embodiment will be described with reference to the accompanying drawings.
FIG. 12 shows a configuration of a broadband radar apparatus 1D according to the fourth embodiment. In the present embodiment, the same components as those in the broadband radar apparatus 1A of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, a transmission reference clock signal and a reception reference clock signal are generated based on the reference clock signal generated by the first reference clock generation unit 111. That is, the reference clock signal generated by the first reference clock generation unit 111 is output to the transmission clock generation unit 112 to generate a transmission clock signal. Further, the reference clock signal generated by the first reference clock generation unit 111 is output to the reception clock generation unit 115 via the time delay control unit 114D to generate a reception clock signal. For this reason, the broadband radar apparatus 1D according to the fourth embodiment does not include the second reference clock generation unit 113 included in the broadband radar apparatuses 1A to 1C according to the first to third embodiments.
The time delay control unit 114D receives the reference clock signal generated by the first reference clock generation unit 111. The time delay control unit 114D generates a reception reference clock signal including a phase shift between the transmission reference clock signal and the reception reference clock signal from the input reference clock signal.
As described above, this embodiment can have a single reference clock generation unit, and can reduce the size and weight of the apparatus. Moreover, the same effect as Example 1 can be acquired.

  The embodiment described above is a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

1A to 1D Wideband radar device 100 Transmitting side device 110 Control unit 114A, 114D Time delay control unit 114B Stepwise time delay control unit 114C Distance-specific time delay control unit 120 UWB pulse generation unit 130 Transmission antenna 200 Reception side device 210 Reception antenna unit 220 receiving unit 230 data editing unit 240 processing unit 250 data display unit

Claims (3)

Transmission clock generation means for generating a transmission clock signal having a constant period;
Pulse generating means for generating a pulse signal synchronized with the transmission clock signal;
A transmitting antenna that radiates a pulse signal generated by the pulse generating means to a target area;
A receiving antenna that receives a reflected wave from an object of the pulse signal transmitted by the transmitting antenna as a received pulse signal;
Reception clock generation means for generating a reception clock signal in which the period of the signal to be generated is reduced continuously or stepwise;
Gate pulse signal generating means for generating a gate pulse signal synchronized with the reception clock signal;
Detection means for detecting a reception pulse signal received by the reception antenna in a period in which a signal level of the gate pulse signal is at a predetermined level, and outputting a reception pulse detection signal;
Integration means for integrating the received pulse detection signal detected by the detection means to extract the signal;
Time sensitivity control means for performing time sensitivity control by integrating a coefficient for correcting the attenuation of the signal level to the signal extracted by the integration means;
A difference calculating means for calculating a difference every predetermined time of the signal whose signal level is corrected, and detecting the movement of the object;
Broadband radar device having   The broadband radar apparatus according to claim 1, wherein the reception clock generation unit changes a period of the reception clock signal according to a distance to the object.   3. The wideband radar apparatus according to claim 1, wherein the transmission clock generation unit and the reception clock generation unit generate a transmission clock signal and a reception clock signal based on one reference clock, respectively.

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