JP2014209110A - Transmitter receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter receiver that outputs a high frequency pulse of an optimal pulse waveform by feeding back the high frequency pulse to be outputted, and adjusting the pulse waveform.SOLUTION: A transmitter receiver 100 comprises: a high frequency transmission part 110 that generates a transmission pulse and outputs the transmission pulse; feed-back means 120 that takes in at least a part of the transmission pulse, and outputs the part thereof as a feed-back signal; a high frequency reception part 130 that performs demodulation processing of the feed-back signal taken in by the feed-back means 120; and a signal process part 140 that inputs a signal processed by the high frequency reception part 130, and performs predetermined computation processing. The signal process part 140 generates a control signal for feeding back to generation of the transmission pulse in the high frequency transmission part 110 so that the signal having the feed-back signal demodulated satisfies a predetermined condition, and outputs the control signal to the high frequency reception part 110.

Description

  The present invention relates to a transmission / reception apparatus that transmits and receives using a high-frequency pulse.

  In a device that transmits and receives using high-frequency pulses, a pulse generator generates a pulse signal having a predetermined pulse width, inputs this to a band-limiting filter having a predetermined frequency characteristic, generates a monopulse, and the monopulse is mixed with the mixer. Is multiplied by a carrier wave input from a high frequency oscillator having a predetermined frequency to generate a high frequency pulse. The generated high frequency pulse is radiated from the transmitting antenna and used for communications, radar, and the like.

  Legal regulations have been established for high-frequency pulses radiated from the antenna to the outside in order to avoid interference with other transmission / reception devices. A technique for adjusting a pulse pattern of a high-frequency pulse so as to comply with laws and regulations is conventionally known. For example, in the above-described transmission / reception apparatus using a general high-frequency pulse, the pattern of the pulse signal output from the pulse generator is adjusted using a band limiting filter.

  Patent Document 1 discloses a technique that can change a band by changing a pulse shape or a center frequency when another wireless method is detected. As a result, when an interference wave is detected, it is possible to shift the transmission wave to a band other than the band that the interference wave has within a range in which legal regulations can be observed. In Patent Document 1, the time difference between a plurality of pulses is changed, and the pulse shape is adjusted using the rising and falling edges of the pulse.

JP 2007-336054 A

  In a conventional transmission / reception apparatus using a high-frequency pulse, the pulse waveform is adjusted in advance so as to obtain a high-frequency pulse having an appropriate pulse waveform. In the above general transmission / reception apparatus that adjusts the signal output from the pulse generator using the band limiting filter, the band limiting filter is adjusted so as to generate a monopulse that complies with laws and regulations. In Patent Document 1, interference with other transmission / reception devices and the like is avoided by a method of shifting the band of the transmission wave by changing the shape of the pulse in the pulse shaping unit.

  However, in the above conventional transmission / reception apparatus, the spectrum of the generated high-frequency pulse is changed from the original one because the spectrum of the generated high-frequency pulse is not confirmed after adjustment in advance to obtain a high-frequency pulse that complies with laws and regulations. I do n’t know. As a result, there is a risk of outputting a high-frequency pulse that deviates from legal regulations. In addition, if the characteristics of the band limiting filter, modulation unit, etc. used to generate the high frequency pulse change due to temperature changes, deterioration over time, etc., the spectrum of the high frequency pulse may deviate from legal regulations. There's a problem.

  An example of the influence on the pulse waveform due to the temperature change is shown in FIG. FIG. 4A shows a pulse waveform diagram on the time axis showing an example in which the waveform of the pulse generated by the pulse generator changes with temperature, and FIG. 4B shows the waveform after being modulated by the modulation unit. The pulse waveform figure on the frequency axis which shows an example in which the spectrum of a high frequency pulse changes with temperature is shown. In FIGS. 9A and 9B, reference numerals 91, 92, and 93 indicate pulse waveforms when the ambient temperature is normal temperature, high temperature, and low temperature, respectively.

  FIG. 14 shows that the pulse waveform changes as the temperature changes. In particular, FIG. 14B shows that the occupied frequency bandwidth deviates from the legal regulations when the ambient temperature becomes low. Yes. As described above, in a conventional transmitter / receiver using a high-frequency pulse, the characteristics of a local oscillator, a pulse generator, a band limiting filter, a modulation unit, etc. used for generating a high-frequency pulse are changed due to a temperature change or aged deterioration. There was a problem that it might deviate from regulations.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a transmission / reception device that outputs a high-frequency pulse having a suitable pulse waveform by feeding back an output high-frequency pulse and adjusting the pulse waveform. And

  In order to solve the above-mentioned problem, a first aspect of the transmission / reception apparatus according to the present invention includes a local oscillator that outputs a carrier wave of a predetermined frequency, a pulse generator that generates and outputs a predetermined pulse pattern, and an input from the local oscillator A modulation unit that modulates the carrier wave with the pulse pattern and outputs a transmission pulse, and a baseband signal using the carrier wave that is input from the local oscillator by inputting a predetermined modulated signal A high-frequency receiving unit having a demodulating unit for demodulating, and a signal processing unit for inputting the baseband signal from the high-frequency receiving unit and performing predetermined signal processing, and further, a predetermined signal generated by the high-frequency transmitting unit Feedback means for taking in a part of the signal and outputting it as a feedback signal to the signal processing section, and the signal processing section When the feedback signal is input from the means, a control signal for adjusting the pulse pattern is output to the pulse generator so that the transmission pulse satisfies a predetermined condition, and the pulse generator is supplied from the signal processing unit. When the control signal is input, the pulse pattern is adjusted and output.

  In another aspect of the transmission / reception apparatus of the present invention, the pulse pattern is formed by a pulse train in which one or more monopulses are arranged.

  In another aspect of the transceiver apparatus of the present invention, the pulse generator adjusts at least one of a pulse width, an amplitude, and a pulse interval of the pulse pattern according to the control signal.

  In another aspect of the transmission / reception apparatus of the present invention, when the modulation unit has a predetermined fast response characteristic, the high-frequency transmission unit inputs the pulse pattern from the pulse generator and gives a predetermined delay characteristic. A band limiting filter for outputting to the modulation unit is further included, and the modulation unit amplitude-modulates the carrier wave input from the local oscillator with a pulse pattern to which the delay characteristic is given, and outputs a transmission pulse. And

  In another aspect of the transmission / reception apparatus of the present invention, when the shape of the pulse pattern to which the delay characteristic is given and the shape of the envelope of the transmission pulse output from the modulation unit have a linear relationship, the feedback means Takes a part of the output signal of the band limiting filter as the predetermined signal and outputs it as the feedback signal.

  In another aspect of the transceiver apparatus of the present invention, the high-frequency transmission unit further includes a transmission antenna for radiating the transmission pulse to space, and the high-frequency reception unit further includes a reception antenna that receives the transmission pulse. It is characterized by having.

  In another aspect of the transmission / reception apparatus according to the present invention, the feedback signal is obtained by performing the signal processing via a predetermined internal path without radiating a part of the predetermined signal generated by the high-frequency transmission unit to the outside. It is the signal output to the part.

  In another aspect of the transmitting / receiving apparatus of the present invention, the feedback means reflects the reflected wave received by the receiving antenna after the transmission pulse radiated from the transmitting antenna is reflected by a nearby reflector. Is output as

  In another aspect of the transmission / reception apparatus of the present invention, the feedback means outputs a signal in which the transmission pulse radiated from the transmission antenna wraps around the reception antenna as the feedback signal.

  In another aspect of the transmission / reception apparatus of the present invention, the feedback means is configured such that the output-side line of the modulation unit and the input-side line of the demodulation unit are coupled via a space or a substrate and the transmission pulse is demodulated. A signal that wraps around the line on the input side of the unit is output as the feedback signal.

  In another aspect of the transmission / reception apparatus of the present invention, the feedback means includes a position where the output-side line of the modulation unit and the input-side line of the demodulation unit are coupled via a space or a substrate, the transmission antenna, A delay unit that delays signal transmission is provided between the receiving antenna and / or the receiving antenna.

  In another aspect of the transmission / reception apparatus of the present invention, the feedback means is disposed between the first coupler disposed between the modulation unit and the transmission antenna, and between the demodulation unit and the reception antenna. A second coupler connected to the first coupler, and outputting a signal in which the transmission pulse propagates through the first coupler and the second coupler as the feedback signal. Features.

  In another aspect of the transmission / reception apparatus of the present invention, the feedback means delays signal transmission between the first coupler and the transmission antenna and / or between the second coupler and the reception antenna. It further has a delay part to be caused.

  In another aspect of the transmission / reception apparatus of the present invention, the feedback means is arranged between the first switch arranged between the modulation unit and the transmission antenna, and between the demodulation unit and the reception antenna. A second switch, and when performing normal transmission / reception, the first switch is switched to a side connecting the modulation unit and the transmission antenna, and the demodulation unit and the reception antenna are connected to each other. When the second switch is switched to the output side and the feedback signal is output to the demodulation unit, the modulation unit and the demodulation unit are connected via the first switch and the second switch. The first switch and the second switch are switched on the same side.

  In another aspect of the transmission / reception apparatus of the present invention, the feedback means delays signal transmission between the first switch and the transmission antenna and / or between the second switch and the reception antenna. It further has a delay part to be caused.

  Another aspect of the transmitting / receiving apparatus of the present invention is characterized in that the transmitting antenna and / or the receiving antenna are configured by two or more antennas that can be used by switching.

  In another aspect of the transmission / reception apparatus of the present invention, the transmission antenna and the reception antenna use one transmission / reception shared antenna, and the modulation unit, the demodulation unit, and the transmission / reception shared antenna are connected via a circulator. It is characterized by being.

  Another aspect of the transmission / reception apparatus of the present invention is characterized in that the signal processing unit calculates the control signal by analyzing the feedback signal on a time axis and a frequency axis.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the transmitter / receiver which outputs the high frequency pulse of a suitable pulse waveform by feeding back the output high frequency pulse and adjusting a pulse waveform.

It is a block diagram which shows the structure of the transmission / reception apparatus which concerns on 1st Embodiment of this invention. It is a time waveform figure showing an example of the pulse pattern generated with the pulse generator of a 1st embodiment. It is a time waveform figure which shows an example of the baseband pulse obtained with the band-limiting filter of 1st Embodiment. It is a graph which shows the spectrum of the transmission pulse produced | generated by the high frequency transmission part of 1st Embodiment. It is a graph which shows an example of the change of the transmission pulse waveform when changing the adjustment parameter of a pulse pattern. It is a graph which shows the influence on the characteristic evaluation of a feedback signal by the number of FFT points. It is a block diagram which shows the 1st structural example of the feedback means of 1st Embodiment. It is a block diagram which shows the 2nd structural example of the feedback means of 1st Embodiment. It is a block diagram which shows the 3rd structural example of the feedback means of 1st Embodiment. It is a block diagram which shows the structure of the transmission / reception apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the transmission / reception apparatus which concerns on 3rd Embodiment of this invention. It is a block diagram which shows a structure when a transmitting antenna and a receiving antenna are comprised with a some antenna. It is a block diagram when a transmitting antenna and a receiving antenna are comprised with one antenna. It is a pulse waveform diagram on the time axis and a pulse waveform diagram on the frequency axis showing an example of the influence on the pulse waveform due to temperature change. It is a block diagram which shows the structure of the transmission / reception apparatus which concerns on 4th Embodiment of this invention. It is a block diagram which shows the structure of the transmission / reception apparatus which concerns on 5th Embodiment of this invention.

  A transmitting / receiving 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.

(First embodiment)
A transmission / reception apparatus according to the first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a transmission / reception device 100 according to the present embodiment. The transmission / reception apparatus 100 of this embodiment is an apparatus that transmits and receives using a transmission pulse in a predetermined high-frequency band, and a high-frequency transmission unit 110 that generates and outputs a transmission pulse, and a feedback signal that captures at least a part of the transmission pulse. A feedback unit 120 that outputs the signal, a high-frequency receiving unit 130 that demodulates the feedback signal captured by the feedback unit 120, a signal processing unit 140 that inputs a signal processed by the high-frequency receiving unit 130 and performs predetermined arithmetic processing It has.

  The high-frequency transmitter 110 receives a local oscillator 111 that outputs a carrier wave of a predetermined frequency, a pulse generator 112 that generates and outputs a predetermined pulse pattern, and a band limit by inputting the pulse pattern generated by the pulse generator 112 Then, a band limiting filter 113 that outputs this as a baseband pulse, and a modulator (modulator) that amplitude-modulates the carrier wave input from the high frequency oscillator 111 with the baseband pulse input from the band limiting filter 113 and outputs a transmission pulse. 114.

  The high-frequency receiving unit 130 includes a demodulation unit 131 that receives a feedback signal from the feedback unit 120 and demodulates it into a baseband feedback signal (hereinafter referred to as a baseband FB signal). The signal processing unit 140 receives the baseband FB signal from the high frequency receiving unit 130 and generates a control signal for feeding back to the high frequency transmitting unit 110 so that the baseband FB signal satisfies a predetermined condition. Then, this control signal is output to the pulse generator 112. The pulse generator 112 changes the pulse pattern according to the control signal input from the signal processing unit 130 and outputs it.

  The transmission / reception apparatus 100 according to the present embodiment can be applied to, for example, a radar apparatus that measures a distance to an object. In this case, the transmission pulse output from the high-frequency transmission unit 110 is radiated from the transmission antenna, the reflected wave reflected by the object is received by the reception antenna, and demodulated by the demodulation unit 131, and then the signal processing unit 140. Is used to calculate the distance to the object. In addition to such a radar function, the transmission / reception apparatus 100 according to the present embodiment includes a feedback unit 120 to generate a pulse pattern in the pulse generator 112 in order to output a transmission pulse having a suitable waveform from the high-frequency transmission unit 110. It is configured to feed back to

  A process in which a transmission pulse is generated in the high-frequency transmission unit 110 will be described below. First, the pulse generator 112 generates a pulse pattern PP as shown in FIG. FIG. 2 is a diagram illustrating an example of a pulse pattern generated by the pulse generator 112, where the horizontal axis represents time and the vertical axis represents pulse amplitude. The pulse pattern PP illustrated in FIG. 2 includes three monopulses P1, P2, and P3, and is a pattern in which pulses P2 and P3 having a short pulse width are combined before and after the main pulse P2 having a long pulse width.

  When the pulse pattern PP shown in FIG. 2 is output from the pulse generator 112 and is input to and passed through the band limiting filter 113, a baseband pulse Pb having a waveform as shown in FIG. 3 is obtained. FIG. 3 is a diagram showing a time waveform of the baseband pulse Pb obtained by passing through the band limiting filter 113, with the horizontal axis representing time and the vertical axis representing pulse amplitude. The pulse pattern PP output from the pulse generator 112 is a pattern in which three monopulses P1, P2, and P3 are combined. By passing through the band limiting filter 113, the waveform is shaped into one baseband pulse Pb. .

  The baseband pulse can be generated by inputting only one monopulse, for example, the main pulse P2 shown in FIG. However, in the case of only the main pulse P2, there is a problem that the level of the side lobe on the frequency axis of the generated baseband pulse is relatively high, for example, exceeding legal restrictions.

  Therefore, in the pulse generator 112 of the present embodiment, in order to suppress the side lobe level generated in the baseband pulse obtained from the single main pulse P2, the main pulse P2 is combined with another monopulse P1 and P3 in the band. The restriction filter 113 is input. As shown in FIG. 2, when the main pulse P2 and the two monopulses P1 and P3 are combined, as parameters for adjusting the waveform of the baseband pulse, the pulse width of each monopulse (particularly the pulse width of the main pulse P2), There is a pulse interval between the main pulse P2 and the monopulses P1 and P3, and a pulse amplitude of each monopulse.

  FIG. 4 shows a waveform (spectrum) on the frequency axis of a transmission pulse generated by the high-frequency transmission unit 110 using the pulse pattern PP shown in FIG. 2 in comparison with the case where only the main pulse P2 is used. Here, the horizontal axis indicates the frequency, and the vertical axis indicates the level. In FIG. 4, the spectrum of the transmission pulse when the pulse pattern PP is used is indicated by reference numeral 10, and the spectrum when only the main pulse P2 is used is indicated by reference numeral 11. Further, reference numeral 12 denotes a spectrum when the rectangular wave (main pulse P2) is modulated without passing through the band limiting filter 113.

  From FIG. 4, it can be seen that the spectrum 12 of the rectangular wave (main pulse P <b> 2) is suppressed by passing the band limiting filter 113 so that the side lobe is suppressed as seen in the spectrum of reference numeral 11. However, it cannot be said that the side lobe of the transmission pulse when only the main pulse P2 is used is sufficiently suppressed. On the other hand, the side lobe is further suppressed in the spectrum 10 of the transmission pulse when the pulse pattern PP is used. The width of the main lobe is maintained substantially the same as when only the main pulse P2 is used.

  As described with reference to FIG. 4, in the high-frequency transmission unit 110 of this embodiment, the side lobe is generated by passing the pulse pattern PP, which is a combination of the main pulse P2 and the other monopulses P1 and P3, to the band limiting filter 113. A suppressed suitable transmission pulse can be obtained. A suitable transmission pulse can be obtained by adjusting the pulse width, the pulse interval, and the pulse amplitude, which are adjustment parameters of the pulse pattern PP.

  An example of how the waveform of the transmission pulse is adjusted by changing the adjustment parameter will be described below with reference to FIG. FIG. 5 (a) shows changes in the pulse width and amplitude of the transmission pulse when the pulse interval is fixed and the pulse width of the main pulse P2 is changed. FIG. 5 (b) also shows the pulse interval. The figure shows changes in the occupied frequency bandwidth of the transmission pulse and the sidelobe suppression amount when the pulse width of the main pulse P2 is changed. FIG. 5C shows changes in the pulse width and amplitude of the transmission pulse when the pulse width of the main pulse P2 is fixed and the pulse interval is changed. FIG. It shows changes in the occupied frequency bandwidth and sidelobe suppression amount of the transmission pulse when the pulse width of the pulse P2 is fixed and the pulse interval is changed.

  From FIG. 5, it can be seen that if the pulse width of the main pulse P2 is changed with the pulse interval fixed, the pulse width, amplitude, occupied frequency bandwidth, and sidelobe suppression amount of the transmission pulse change relatively large. Further, if the pulse width of the main pulse P2 is fixed and the pulse interval is changed, the pulse width and amplitude of the transmission pulse are not greatly changed, but the occupied frequency bandwidth and the sidelobe suppression amount may change relatively large. Recognize. Therefore, it is understood that the waveform of the transmission pulse can be adjusted by changing the adjustment parameters such as pulse width, pulse interval, and pulse amplitude.

  In the transmission / reception apparatus 100 according to the present embodiment, when a transmission pulse is output from the high-frequency transmission unit 110, a part of the transmission pulse is captured as a feedback signal by the feedback unit 120, demodulated by the demodulation unit 131, and then the signal processing unit At 140, signal processing is performed. The signal processing unit 140 performs FFT processing on the baseband FB signal input from the demodulation unit 131, and obtains a pulse waveform on the time axis and a pulse waveform (spectrum) on the frequency axis from the FFT processing result. Based on these results, the pulse width of the transmission pulse, the level of the side lobe, and the like are acquired, and it is determined whether the transmission pulse has an appropriate pulse waveform.

  When the signal processing unit 140 determines that the pulse waveform of the transmission pulse is not appropriate, for example, based on the characteristics shown in FIG. 5, the pulse width of the pulse pattern generated by the pulse generator 112, the pulse interval, and the pulse A control signal for changing at least one of the amplitudes is generated and output to the pulse generator 112. Thereby, the pulse pattern generated by the pulse generator 112 is adjusted, and a suitable transmission pulse is output from the high-frequency transmission unit 110.

  As described above, the signal processing unit 140 generates a control signal by performing FFT processing on the baseband FB signal. However, if the number of FFT processing points is too small, accurate information can be obtained from the baseband FB signal. Can not be. Further, since the processing time increases as the number of FFT points increases, it is necessary to set the number of FFT points appropriately. 6A and 6B show examples of the amplitude on the time axis and the level on the frequency axis of the baseband FB signal when the FFT processing is performed by changing the number of FFT points. . Moreover, the change of the sidelobe suppression amount with respect to the number of FFT points is shown in FIG.

  FIG. 6 shows the result when the number of FFT points is changed to 32, 64, 128, and 1024, and the result when the number of FFT points is 1024 points is the highest in accuracy. . 6 (a) and 6 (b) show almost no difference due to the number of FFT points, but with the sidelobe suppression amount shown in FIG. 6 (c), the result for 32 points with a small number of FFT points is 1024 points. The result is different from that of. From this, it can be seen that when the number of FFT points is 32, sufficiently high accuracy cannot be obtained, and it is preferable to set the number of FFT points to 64 points.

  In the above description, in order to suitably adjust the pulse waveform of the transmission pulse, it has been described that the feedback unit 120 that captures a part of the transmission pulse and feeds back is provided. Hereinafter, a specific configuration example of the feedback unit 120 will be described. To do. The signal fed back by the feedback unit 120 is a signal other than the signal that is input to the high-frequency receiving unit 130 after the transmission pulse is reflected by an external object or the like. This signal is input to the high-frequency receiving unit 130 via a route.

  A first configuration example of the feedback unit 120 that acquires the feedback signal will be described with reference to FIG. FIG. 7 is a block diagram illustrating a first configuration example of the feedback unit 120. In the first configuration example of the feedback unit 120, the transmission pulse output from the high-frequency transmission unit 110 is radiated from the transmission antenna 115 and reflected by the nearby reflector 50, and the reflected wave is received by the reception antenna 132. The signal is used as a feedback signal. As the reflector 50 in the vicinity, for example, there is a radome that covers the transmission antenna 115 and the reception antenna 132. Alternatively, when the transmission / reception device 100 is mounted on the back side of the bumper on the front surface or the rear surface of the vehicle, the bumper may be the reflector 50.

  When the feedback unit 120 of the first configuration example is used, the reflected wave from the adjacent reflector 50 is used for the feedback signal, so that it can be easily distinguished from the reflected wave from the object at a further distance. As a result, the signal processing unit 140 can correctly identify the feedback signal and feed it back to the generation of the pulse pattern in the pulse generator 112.

  A second configuration example of the feedback unit 120 that acquires the feedback signal will be described with reference to FIG. FIG. 8 is a block diagram showing a second configuration example of the feedback unit 120. In the second configuration example of the feedback unit 120, the transmission pulse output from the high-frequency transmission unit 110 is radiated from the transmission antenna 115, and the signal that circulates to the reception antenna 132 and is directly received is used as the feedback signal. .

  When the feedback means 120 of the second configuration example is used, since the time until the signal is radiated from the transmitting antenna 115 and received by the receiving antenna is further shortened, it is more easily distinguished from the reflected wave from the object in the distance. can do. As a result, the signal processing unit 140 can correctly identify the feedback signal and feed it back to the generation of the pulse pattern in the pulse generator 112.

  A third configuration example of the feedback unit 120 that acquires the feedback signal will be described with reference to FIG. FIG. 9 is a block diagram illustrating a third configuration example of the feedback unit 120. In the third configuration example of the feedback unit 120, the transmission pulse radiated from the transmission antenna 115 is not received as a feedback signal, but a signal in which the transmission pulse wraps around the reception side in the transmission / reception apparatus 100 is used as the feedback signal. It is. As a wraparound of the transmission pulse to the reception side, there are one that is spatially coupled and one that wraps around through a substrate.

  Such a sneak signal can be easily distinguished from a reflected wave from a distant object because the time from when the transmission pulse is output from the modulator 114 to the demodulator 131 is extremely short. . As a result, the signal processing unit 140 can correctly identify the feedback signal that is a wraparound signal and feed it back to the generation of the pulse pattern in the pulse generator 112.

  In the feedback means 120 of the third configuration example, the feedback signal and the reflected wave from the object received by the reception antenna 132 can be more reliably distinguished between the modulator 114 and the transmission antenna 115. The delay unit 116 may be provided, or the delay unit 133 may be provided between the reception antenna 132 and the demodulation unit 131. Alternatively, both the delay units 116 and 133 may be provided.

  Since both the transmission pulse and the reflected wave are high-frequency signals, it is preferable to form the delay units 116 and 133 with a distributed constant circuit. For example, a microstrip line in which a line having a predetermined length is formed can be used for the delay units 116 and 133. Thereby, it can delay by the time which propagates the track | line of predetermined length of the delay parts 116 and 133. FIG.

  When the delay unit 116 is provided, when a transmission pulse is output from the modulator 114, the feedback signal immediately circulates to the reception side, whereas the transmission antenna 115 radiates the transmission pulse with a delay. As a result, the timing at which the reception antenna 132 receives the reflected wave is also delayed, so that the difference between the timing at which the demodulation unit 131 processes the feedback signal and the timing at which the reception signal received by the reception antenna 132 is processed can be increased. . Even when the delay unit 133 is provided, the timing at which the reception signal received by the reception antenna 132 is output to the demodulation unit 131 is delayed, so that the timing difference between the feedback signal and the reception signal can be increased similarly. it can. When both delay units 116 and 133 are provided, the effect of increasing the timing difference can be further enhanced.

(Second Embodiment)
A transmission / reception apparatus according to the second embodiment of the present invention will be described below with reference to FIG. FIG. 10 is a block diagram illustrating a configuration of the transmission / reception device 200 of the present embodiment. In the transmission / reception apparatus 200 of the present embodiment, the feedback unit 220 is different from the feedback unit 120 of the first embodiment. The feedback means 220 of this embodiment has a line that directly takes in a feedback signal from the transmission side to the reception side. That is, the line between the modulation unit 114 on the transmission side and the transmission antenna 115 and the line between the demodulation unit 131 on the reception side and the reception antenna 132 are connected via the couplers 217 and 234, respectively.

  With such a configuration, a part of the transmission pulse is transmitted to the reception side by the coupler 217, and this can be used as a feedback signal. By using, for example, a coupler that divides a signal 20 dB lower as the coupler 217, it is possible to hardly affect the power of the transmission pulse transmitted to the transmission antenna 115. Further, by using the same coupler as the coupler 234, it is possible to hardly influence the power of the reception signal received by the reception antenna 132. In the present embodiment, the feedback signal input via the couplers 217 and 234 can be used to feed back to the pulse pattern generation in the pulse generator 112.

  In the transmitting / receiving apparatus 200 of the present embodiment, the feedback signal and the reflected wave from the object received by the receiving antenna 132 can be more reliably distinguished between the coupler 217 and the transmitting antenna 115. The delay unit 116 may be provided, or the delay unit 133 may be provided between the reception antenna 132 and the coupler 234. Alternatively, both the delay units 116 and 133 may be provided.

(Third embodiment)
A transmission / reception apparatus according to the third embodiment of the present invention will be described below with reference to FIG. FIG. 11 is a block diagram illustrating a configuration of the transmission / reception device 300 according to the present embodiment. Also in the transmission / reception apparatus 300 of the present embodiment, the feedback means 320 has a line for directly taking in the feedback signal from the transmission side to the reception side, and instead of the couplers 217 and 234 of the second embodiment, an SPDT (Single Pole Double Throw) ) Switches 317 and 334 are provided.

  In the transmission / reception apparatus 300 according to the present embodiment, the SPDT switches 317 and 334 are switched between normal transmission / reception and when a feedback signal is acquired. During normal transmission / reception, the SPDT switch 317 is switched to the side where the modulator 114 and the transmission antenna 115 are connected, and the SPDT switch 334 is switched to the side where the demodulation unit 131 and the reception antenna 132 are connected. As a result, the transmission pulse output from the modulation unit 114 is radiated from the transmission antenna 115, and the reception signal received by the reception antenna 132 is input to the demodulation unit 131, and predetermined signal processing is performed.

  On the other hand, when the feedback signal is acquired, the SPDT switches 317 and 334 are switched to the side connecting the both. As a result, the transmission pulse output from the modulation unit 114 is input to the demodulation unit 131 via the line connecting the SPDT switches 317 and 334 as a feedback signal. In the present embodiment, it is possible to feed back to the generation of a pulse pattern in the pulse generator 112 using a feedback signal input via a line connecting the SPDT switches 317 and 334.

  Note that, in the transmission / reception apparatus 300 of this embodiment, the feedback signal and the reflected wave from the object received by the reception antenna 132 can be more reliably distinguished between the SPDT switch 317 and the transmission antenna 115. The delay unit 116 may be provided, or the delay unit 133 may be provided between the reception antenna 132 and the SPDT switch 334. Alternatively, both the delay units 116 and 133 may be provided.

  In the description of each of the above embodiments, the case where each of the transmission antenna 115 and the reception antenna 132 is configured by one antenna has been described as an example. It may be configured by. Alternatively, both the transmission antenna 115 and the reception antenna 132 may be composed of a plurality of antennas. As an example, FIG. 12 shows a block diagram when the transmission / reception apparatus 100 of the first embodiment includes the feedback unit 120 of the first configuration example, and both the transmission antenna 115 and the reception antenna 132 are configured by a plurality of antennas. . Here, a plurality of antennas of the transmission antenna 115 and the reception antenna 132 are used by being switched by the antenna switching units 115a and 132a.

  The transmission pulse radiated from the antenna selected by the antenna switching unit 115a of the transmission antenna 115 is reflected by the nearby reflector 50, and this reflected wave is received by the antenna selected by the antenna switching unit 132a of the reception antenna 132. Used for feedback signals.

  In each of the embodiments described above, both the transmission antenna 115 and the reception antenna 132 are provided, but it is also possible to use one antenna for both transmission and reception instead. . As an example, FIG. 13 is a block diagram when the transmitting / receiving apparatus 100 of the first embodiment includes the feedback unit 120 of the first configuration example and is configured to use one antenna for both transmission and reception. Show. Here, one transmission / reception shared antenna 150 is connected to the modulation unit 114 and the demodulation unit 131 via the circulator 151.

  In the above configuration, the transmission pulse output from the modulation unit 114 is output to the transmission / reception shared antenna 150 via the circulator 151, while the signal received by the transmission / reception shared antenna 150 is output to the demodulation unit 131 via the circulator 151. The Therefore, when the transmission pulse radiated from the transmission / reception shared antenna 150 is reflected by the nearby reflector 50 and received again by the shared transmission / reception antenna 150, it can be output to the demodulation unit 131 as a feedback signal. In the present configuration having only one antenna, the feedback unit 120 of the second configuration example of the first embodiment cannot be applied.

(Fourth embodiment)
A transmission / reception apparatus according to the fourth embodiment of the present invention will be described below with reference to FIG. FIG. 15 is a block diagram illustrating a configuration of the transmission / reception device 400 of the present embodiment. In the transmission / reception apparatus 400 according to the present embodiment, the high-frequency transmission unit 410 does not include the band limiting filter 113 according to the first embodiment, and the pulse pattern generated by the pulse generation unit 412 is directly input to the modulator 414. .

  In the transmission / reception device 400 of this embodiment, the modulator 414 has a response characteristic comparable to the group delay characteristic of the band limiting filter 113. As a result, the modulator 414 can output a transmission pulse that is amplitude-modulated with the pulse pattern input from the pulse generator 112 and simultaneously band-limited.

  In the transmission / reception apparatus 400 of the present embodiment, any of the feedback means 120, 220, and 320 used in each of the above embodiments can be used as the feedback means.

(Fifth embodiment)
A transmission / reception apparatus according to the fifth embodiment of the present invention will be described below with reference to FIG. FIG. 16 is a block diagram illustrating a configuration of the transmission / reception device 500 of the present embodiment. In the transmission / reception device 500 of this embodiment, a feedback unit 520 is provided between the band limiting filter 513 and the modulator 514, and a feedback signal that is an output signal thereof is output to the signal processing unit 140. ing. The feedback unit 520 outputs the baseband pulse input from the band limiting filter 513 to the modulator 514 as it is, and outputs a part of the baseband pulse to the signal processing unit 140 as a feedback signal.

  In the transmission / reception apparatus 500 according to the present embodiment, the modulator 514 has such a characteristic that the shape of the baseband pulse input to the modulator 514 and the shape of the envelope of the transmission pulse output from the modulator 514 are linear. Is used. As a result, instead of the transmission pulse that is the output signal of the modulator 514, the baseband pulse that is the input signal of the modulator 514 is used as a feedback signal, but is fed back to the pulse pattern generated by the pulse generator 112. It is possible to generate a suitable transmission pulse. As the modulation unit 514 having such characteristics, for example, a mixer can be used.

  In the transmission / reception apparatus 500 of this embodiment, the feedback unit 520 can be configured by a distributor or a coupler, for example.

  In the description of the fourth and fifth embodiments, the transmitting antenna 115 and the receiving antenna 132 are not described, but the antenna configuration in each of the above embodiments is used.

  The description in the present embodiment shows an example of the transmission / reception apparatus according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of the transmission / reception apparatus in this embodiment can be changed as appropriate without departing from the spirit of the present invention.

100, 200, 300, 400, 500 Transceiver 110, 410, 510 High-frequency transmitter 111, 411, 511 Local oscillator 112, 412, 512 Pulse generator 113, 513 Band limiting filter 114, 414, 514 Modulator 115 Transmitting antenna 116, 133 Delay units 120, 220, 320, 520 Feedback means 130 High-frequency receiving unit 131 Demodulating unit 132 Reception antenna 140 Signal processing unit 150 Transmission / reception shared antenna 151 Circulator 217, 234 Coupler 317, 334 SPDT switch

Claims (18)

A local oscillator that outputs a carrier wave of a predetermined frequency, a pulse generator that generates and outputs a predetermined pulse pattern, and a modulation unit that modulates the carrier wave input from the local oscillator with the pulse pattern and outputs a transmission pulse A high frequency transmitter having
A high-frequency receiver having a demodulator that inputs a predetermined modulated signal and demodulates the baseband signal with the carrier wave input from the local oscillator;
A signal processing unit that inputs the baseband signal from the high-frequency receiving unit and performs predetermined signal processing;
Furthermore, a feedback unit that takes in a part of a predetermined signal generated by the high-frequency transmission unit and outputs it as a feedback signal to the signal processing unit,
When the feedback signal is input from the feedback unit, the signal processing unit outputs a control signal for adjusting the pulse pattern so that the transmission pulse satisfies a predetermined condition, to the pulse generator,
When the control signal is input from the signal processing unit, the pulse generator adjusts and outputs the pulse pattern. The transmission / reception apparatus according to claim 1, wherein the pulse pattern is formed by a pulse train in which one or more monopulses are arranged. The transmission / reception apparatus according to claim 1, wherein the pulse generator adjusts at least one of a pulse width, an amplitude, and a pulse interval of the pulse pattern according to the control signal. When the modulation unit has a predetermined fast response characteristic,
The high-frequency transmission unit further includes a band limiting filter that inputs the pulse pattern from the pulse generator and gives a predetermined delay characteristic to output to the modulation unit,
The said modulation | alteration part amplitude-modulates the said carrier wave input from the said local oscillator with the pulse pattern to which the said delay characteristic was given, The transmission pulse is output, The transmission pulse of Claim 1 characterized by the above-mentioned. Transmitter / receiver. When the shape of the pulse pattern provided with the delay characteristic and the shape of the envelope of the transmission pulse output from the modulation unit have a linear relationship,
5. The transmission / reception apparatus according to claim 4, wherein the feedback means takes in a part of the output signal of the band limiting filter as the predetermined signal and outputs it as the feedback signal. The high-frequency transmission unit further includes a transmission antenna for radiating the transmission pulse to space,
The transmission / reception apparatus according to claim 4, wherein the high-frequency receiving unit further includes a reception antenna that receives the transmission pulse. The feedback signal is a signal output to the signal processing unit via a predetermined internal path without radiating a part of the predetermined signal generated by the high-frequency transmission unit to the outside. The transmitting / receiving apparatus according to claim 4. The feedback means outputs the reflected wave received by the receiving antenna as a feedback signal after the transmission pulse radiated from the transmitting antenna is reflected by a predetermined reflector nearby. The transmitting / receiving apparatus according to 1. 47. The transmission / reception apparatus according to claim 46, wherein the feedback means outputs, as the feedback signal, a signal in which the transmission pulse radiated from the transmission antenna wraps around the reception antenna. The feedback means includes a signal in which the transmission-side line of the modulation unit and the input-side line of the demodulation unit are coupled via a space or a substrate so that the transmission pulse wraps around the input-side line of the demodulation unit. The transmission / reception apparatus according to claim 6, wherein the transmission / reception apparatus outputs the feedback signal. The feedback means includes a signal between a position where the output-side line of the modulation unit and the input-side line of the demodulation unit are coupled via a space or a substrate and the transmission antenna and / or the reception antenna. The transmission / reception apparatus according to claim 10, further comprising a delay unit that delays transmission of the transmission. The feedback means includes a first coupler disposed between the modulation unit and the transmission antenna, and a second coupler disposed between the demodulation unit and the reception antenna and connected to the first coupler. The transmission / reception apparatus according to claim 6, wherein a signal in which the transmission pulse propagates through the first coupler and the second coupler is output as the feedback signal. . The feedback means further includes a delay unit that delays signal transmission between the first coupler and the transmitting antenna and / or between the second coupler and the receiving antenna. The transmission / reception apparatus according to claim 12, characterized in that: The feedback means includes a first switch disposed between the modulation unit and the transmission antenna, and a second switch disposed between the demodulation unit and the reception antenna.
When normal transmission / reception is performed, the first switch is switched to the side connecting the modulation unit and the transmission antenna, and the second switch is switched to the side connecting the demodulation unit and the reception antenna. And
When outputting the feedback signal to the demodulator, the first switch and the second switch are connected to the side where the modulator and demodulator are connected via the first switch and the second switch. The transmission / reception apparatus according to claim 6, wherein the switch is switched. The feedback means further includes a delay unit that delays signal transmission between the first switch and the transmission antenna and / or between the second switch and the reception antenna. The transmission / reception apparatus according to claim 14, characterized in that: The transmission / reception apparatus according to any one of claims 6 to 15, wherein the transmission antenna and / or the reception antenna is configured by two or more antennas that can be switched and used. The transmission antenna and the reception antenna use one transmission / reception shared antenna,
15. The transmission / reception apparatus according to claim 6, wherein the modulation unit, the demodulation unit, and the transmission / reception shared antenna are connected via a circulator. The transmission / reception apparatus according to claim 1, wherein the signal processing unit calculates the control signal by analyzing the feedback signal on a time axis and a frequency axis.

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