JP5607789B1 - Multi-band simultaneous sensing device and multi-band simultaneous sensing method - Google Patents

Abstract

Disclosed is a leakage of a signal frequency-converted by a harmonic, which occurs when a signal in a wide frequency band is down-converted.
A distribution unit distributes a radio signal amplified by a broadband low noise amplifier. The local oscillation signal output units 14-1 to 14-4 supply local oscillation signals having a predetermined frequency or a frequency obtained by adding an integer multiple of a predetermined differential frequency to a predetermined frequency, and frequency converters 15-1 to 15-15. -4 performs frequency conversion by multiplying the supplied local oscillation signal by the radio signal. A predetermined frequency band is extracted from the frequency-converted signal by the low-pass filters 16-1 to 16-4, and converted from analog to digital by the analog-digital converters 17-1 to 17-4. The Fourier transform units 18-1 to 18-4 perform a Fourier transform on the radio signal after the frequency conversion to convert it into a frequency domain signal, and the arithmetic unit 19 is a signal included in the radio signal based on the Fourier transformed signal. Specify the frequency.
[Selection] Figure 1

Description

  The present invention relates to a multiband simultaneous sensing apparatus and a multiband simultaneous sensing method for simultaneously sensing surrounding radio wave conditions in a plurality of bands.

  In a normal wireless communication device, a received radio wave is first passed through a band-pass filter circuit to extract and process only a signal in a necessary frequency band (see, for example, Non-Patent Document 1). However, when trying to sense the surrounding radio wave condition over a wide band, a bandpass filter circuit is not used or a filter circuit having a wide pass frequency band is used.

  By the way, in the wireless sensing device, it is necessary to receive and process a signal used for wireless communication, but the wireless communication signal is not a signal in the baseband frequency band that is the frequency band of the signal to be transmitted, This is a high-frequency band signal that is carried on a carrier wave. For this reason, it is necessary for the frequency converter to multiply the received high frequency band signal with the local oscillation signal and convert it to a baseband frequency band signal or an intermediate frequency band signal.

The Institute of Electronics, Information and Communication Engineers, “Knowledge Base Group 4 (Mobile / Wireless) -1 Edition (Basics of Wireless Communication), Chapter 11 Receivers”, [Search April 21, 2013], Internet <URL: http: / /www.ieice-hbkb.org/files/04/04gun_01hen_11.pdf>

  When a signal whose frequency band is equal to or higher than the frequency of the local oscillation signal is input to the frequency converter by using a filter circuit that does not use a bandpass filter circuit or has a wide pass frequency band, an integer of the local oscillation signal A signal multiplied by the doubled signal is output. For this reason, it is possible to distinguish whether the signal converted to the baseband frequency band or the intermediate frequency band is a desired signal multiplied by the local oscillation signal or a signal multiplied by a harmonic signal that is an integral multiple of the local oscillation signal. There was a problem that it could not be done.

  In view of the above circumstances, the present invention provides a multi-band simultaneous sensing device capable of distinguishing leakage of a signal frequency-converted by a harmonic generated when down-converting a signal in a wide frequency band, and multi-band simultaneous It aims to provide a sensing method.

  One aspect of the present invention is a wideband low-noise amplification unit, a distribution unit, a local oscillation signal output unit, a frequency conversion unit, a low-pass filter, an analog-digital conversion unit, a plurality of sets of Fourier transform units, and a calculation unit The broadband low noise amplification unit amplifies a radio signal in a radio frequency band, the distribution unit distributes the radio signal amplified by the broadband low noise amplification unit, and the local oscillation signal output unit is A local oscillation signal having a predetermined frequency, or a local oscillation signal having a frequency obtained by adding an integer multiple of a predetermined differential frequency to the predetermined frequency, and the frequency conversion unit is output from the corresponding local oscillation signal output unit. The local oscillation signal is multiplied by the radio signal distributed by the distributing unit to perform frequency conversion, and the low-pass filter has the frequency converted by the corresponding frequency converting unit. A predetermined frequency band of the signal is passed, and the analog-to-digital conversion unit converts the radio signal after frequency conversion passed through the corresponding low-pass filter from analog to digital, and the Fourier transform unit The analog-to-digital converter converts the radio signal after the frequency conversion into a digital signal by Fourier-transforming it into a frequency-domain signal, and the arithmetic unit converts the frequency-domain signal into a plurality of Fourier-transformed signals. The multiband simultaneous sensing device is characterized in that the frequency of a signal included in the wireless signal is specified based on the frequency.

  One aspect of the present invention is the multi-band simultaneous sensing device described above, further including a filter unit that performs a filtering process that passes the radio signal in a radio frequency band including a desired signal, and the filter unit receives Performing the filtering process on the radio signal and outputting it to the broadband low-noise amplification unit, or performing the filtering process on the radio signal amplified by the broadband low-noise amplification unit and outputting to the distribution unit. Features.

  One aspect of the present invention is the multiband simultaneous sensing device described above, which passes the radio signal in a radio frequency band including a desired signal and a radio frequency band that is frequency-converted by a harmonic of the local oscillation signal. A filtering unit that performs filtering processing, wherein the filtering unit performs the filtering process on the received radio signal and outputs the filtered signal to the wideband low noise amplification unit, or the wideband low noise amplification unit amplified The wireless signal is subjected to the filtering process and output to the distributing unit.

  One aspect of the present invention is the multi-band simultaneous sensing device described above, further comprising a plurality of amplifying units that amplify the radio signal distributed by the distributing unit and output the amplified signal to the corresponding frequency converting unit. It is characterized by.

  One aspect of the present invention is the above-described multiple-band simultaneous sensing device, comprising: a gain adjustment unit that adjusts a gain of the wireless signal that is amplified by the wideband low-noise amplification unit and is input to the frequency conversion unit. It is further provided with the feature.

  One aspect of the present invention is a wideband low-noise amplification unit, a distribution unit, a local oscillation signal output unit, a frequency conversion unit, a low-pass filter, an analog-digital conversion unit, a plurality of sets of Fourier transform units, and a calculation unit A multi-band simultaneous sensing method executed by a multi-band simultaneous sensing device comprising: the broadband low noise amplifying unit amplifying a radio signal in a radio frequency band; and the distributing unit is configured by the broadband low noise amplifying unit. Distributing the amplified radio signal, the local oscillation signal output unit outputs a local oscillation signal of a predetermined frequency, or a local oscillation signal of a frequency obtained by adding an integer multiple of a predetermined differential frequency to the predetermined frequency, The frequency conversion unit performs frequency conversion by multiplying the local oscillation signal output from the corresponding local oscillation signal output unit by the radio signal distributed by the distribution unit, and A band-pass filter passes a predetermined frequency band of the radio signal frequency-converted by the corresponding frequency converter, and the analog-digital converter after the frequency conversion passed by the corresponding low-pass filter The radio signal is converted from analog to digital, and the Fourier transform unit converts the radio signal after frequency conversion converted into digital by the corresponding analog-to-digital conversion unit to convert the radio signal into a frequency domain signal, In the multiband simultaneous sensing method, the calculation unit specifies a frequency of a signal included in the radio signal based on a frequency domain signal converted by the plurality of Fourier transform units.

  According to the present invention, it is possible to distinguish leakage of a signal frequency-converted by a harmonic, which occurs when a wide frequency band signal is down-converted.

It is a functional block diagram which shows the structure of the multi-band simultaneous sensing apparatus by the 1st Embodiment of this invention. It is a figure which shows the signal of IF band which the frequency converter by the embodiment outputs. The example of the signal contained in the RF signal by the same embodiment and the signal contained in IF signal after down-conversion is shown. It is a functional block diagram which shows the structure of the multi-band simultaneous sensing apparatus by 2nd Embodiment. It is a functional block diagram which shows the other structure of the multi-band simultaneous sensing apparatus by the same embodiment. It is a functional block diagram which shows the structure of the multi-band simultaneous sensing apparatus by 3rd Embodiment. It is a functional block diagram which shows the other structure of the multi-band simultaneous sensing apparatus by the same embodiment. It is a functional block diagram which shows the structure of the multi-band simultaneous sensing apparatus by 4th Embodiment. It is a functional block diagram which shows the structure of the multi-band simultaneous sensing apparatus by 5th Embodiment. It is a functional block diagram which shows the other structure of the multi-band simultaneous sensing apparatus by the same embodiment.

  Hereinafter, a multiple-band simultaneous sensing device according to an embodiment of the present invention will be described with reference to the drawings. The multi-band simultaneous sensing device according to the present embodiment distributes received radio frequency (RF) band signals (hereinafter referred to as “RF signals”) and inputs the signals to a plurality of frequency converters. Each frequency converter multiplies the input RF signal by a local oscillation signal having a different frequency, and converts the frequency into a signal in an intermediate frequency (IF) band or a baseband frequency band. In this way, each frequency converter outputs a multiplication result with a different local oscillation signal, so that an RF signal multiplied by an integer multiple of the local oscillation signal is output from each frequency converter. Change the frequency. Therefore, the multiple-band simultaneous sensing device can distinguish whether or not the signal is a signal multiplied by an integer multiple of the local oscillation signal by comparing the outputs from the frequency converters.

[First Embodiment]
FIG. 1 is a functional block diagram showing a configuration of a multi-band simultaneous sensing device 10 according to the first embodiment of the present invention. The multiband simultaneous sensing device 10 includes an input unit 11, a broadband low noise amplifier 12, a distribution unit 13, local oscillation signal output units 14-1 to 14-n, frequency converters 15-1 to 15-n, a low-pass filter. (LPF: Low Pass Filter) 16-1 to 16-n, Analog to Digital Converter (ADC) 17-1 to 17-n, Fourier Transform (FFT) 18-1 to 18-n and the calculation part 19 are comprised (n is an integer greater than or equal to 2). In the figure, the case of n = 4 is shown.

  The input unit 11 receives an RF signal received by the multiband simultaneous sensing device 10 and outputs the RF signal to the wideband low noise amplifier 12. The broadband low noise amplifier 12 amplifies the RF signal input from the input unit 11 and outputs the amplified RF signal to the distribution unit 13. The frequency band amplified by the broadband low noise amplifier 12 includes at least all the frequency bands to be sensed, that is, all the high frequency bands (RF bands) in which a desired signal can be included in the RF signal. A plurality of stages of wideband low noise amplifiers 12 may be used. The distributor 13 distributes the RF signal amplified by the wideband low noise amplifier 12 and inputs the RF signal to the frequency converters 15-1 to 15-n.

  The local oscillation signal output unit 14-i (i is an integer of 1 to n) generates a local oscillation signal LOi and outputs it to the frequency converter 15-i. The local oscillation signals LO1 to LOn have different frequencies, and are a predetermined frequency or a frequency obtained by adding an integral multiple of a predetermined differential frequency to the predetermined frequency. The frequency converter 15-i (i is an integer of 1 to n) receives the local oscillation signal LOi output from the local oscillation signal output unit 14-i and the RF signal distributed by the distribution unit 13. The frequency converter 15-i multiplies the local oscillation signal LOi input from the local oscillation signal output unit 14-i by the RF signal input from the distribution unit 13, and performs frequency multiplication to the IF band or the baseband frequency band by multiplication. The converted signal is output to the low-pass filter 16-i.

  The low-pass filter 16-i (i is an integer of 1 to n) passes an IF band or baseband frequency band signal included in the signal output from the frequency converter 15-i, and passes the IF band or base band. A signal outside the band frequency band is attenuated and output to the analog-digital conversion unit 17-i. The analog-digital conversion unit 17-i (i is an integer of 1 to n) samples the signal output from the low-pass filter 16-i at a predetermined sampling frequency, A digital signal corresponding to the intensity is converted to generate a digital signal of time series data. The analog-digital conversion unit 17-i outputs the generated digital signal of the time series data to the Fourier transform unit 18-i.

  The Fourier transform unit 18-i (i is an integer greater than or equal to 1 and lower than n) performs Fourier transform on the signal input from the analog-digital conversion unit 17-i to convert the signal into a frequency domain signal, and outputs the signal to the calculation unit 19. . The computing unit 19 compares the frequency domain signals input from the Fourier transform units 18-1 to 18-n, and identifies the frequency of the signal included in the RF signal.

Next, the operation of the multiband simultaneous sensing device 10 shown in FIG. 1 will be described. In the following, frequency converters 15-1 to 15-4 will be described by taking an example in which an RF signal is converted into an IF band signal.
When receiving the RF signal, the multi-band simultaneous sensing device 10 inputs the received RF signal to the input unit 11. The input unit 11 outputs the input RF signal to the broadband low noise amplifier 12, and the broadband low noise amplifier 12 amplifies the RF signal and outputs the amplified RF signal to the distribution unit 13. The distributor 13 distributes the RF signal amplified by the wideband low noise amplifier 12 and inputs the RF signal to the frequency converters 15-1 to 15-4.

  The local oscillation signal output units 14-1 to 14-4 generate local oscillation signals LO1 to LO4, respectively, and output them to the corresponding frequency converters 15-1 to 15-4. The frequency converters 15-1 to 15-4 multiply the local oscillation signals output from the corresponding local oscillation signal output units 14-1 to 14-4 by the RF signals input from the distribution unit 13, and perform multiplication. The frequency-converted IF band signal is output to the corresponding low-pass filters 16-1 to 16-4.

  FIG. 2 is a diagram illustrating IF band signals output from the frequency converters 15-1 to 15-4. As shown in the figure, the frequency converter 15-i (i is an integer of 1 to 4) is a multiplication result of the RF signal and the local oscillation signal LOi output from the local oscillation signal output unit 14-i. The IF band signal IFi is output.

  The low-pass filter 16-i (i is an integer of 1 to 4) passes the IF band of the signal IFi output from the corresponding frequency converter 15-i and attenuates signal components other than the IF band. It outputs to the analog-digital conversion part 17-i. The analog-digital conversion unit 17-i (i is an integer of 1 to 4) converts the signal IFi output from the corresponding low-pass filter 16-i from an analog signal to a digital signal, and a Fourier transform unit 18- output to i.

  The Fourier transform unit 18-i (i is an integer of 1 or more and 4 or less) performs Fourier transform on the signal IFi input from the corresponding analog-digital conversion unit 17-i to convert the signal IFi into a frequency domain signal. Output to. The calculation unit 19 compares the signals in the frequency domain of the signals IF1 to IF4 input from the Fourier transform units 18-1 to 18-4, and calculates the frequency of each signal in the high frequency band. Thereby, the calculating part 19 specifies the frequency of each signal contained in RF signal.

For example, an RF signal having a frequency Frf1 is frequency-converted into an IF band signal having a frequency Fif1 = Frf1-Flo1 by down-conversion using a local oscillation signal having a frequency Flo1.
At this time, if another RF signal is present at the frequency Frf2 = 2Flo1 + Fif1, this RF signal is down-converted to the frequency Fif1 by the high frequency of the second harmonic component of the frequency Flo1. Therefore, when an IF signal having the frequency Fif1 is observed after down-conversion, it cannot be distinguished whether the RF signal is in either the frequency band Frf1 or the frequency Frf2.
Alternatively, when there is another RF signal at the frequency Frf1i = Flo1-Fif1, this RF signal is down-converted to the frequency Fif1 by the local oscillation signal of the frequency Flo1. Therefore, when an IF signal having the frequency Fif1 is observed after down-conversion, it cannot be distinguished whether the RF signal is in one of the frequency bands Frf1 and Frf1i.

Here, let us consider a case where the RF signal of the frequency Frf is down-converted using the local oscillation signals of the frequency Flo2 = Flo1 + a and the frequency Flo3 = Flo1 + 2a in addition to the frequency Flo1 (a is a predetermined difference frequency).
When the RF signal of the frequency Frf is an RF signal corresponding to the frequency Frf1, the local oscillation signals of the frequencies Flo1, Flo2, and Flo3 respectively cause the frequencies Frf−Flo1, Frf−Flo2 = Frf− (Flo1 + a), Frf. Down-converted to -Flo3 = Frf- (Flo1 + 2a) (where Frf> Flo3). That is, the frequency is sequentially down-converted by a. However, when the frequency of the local oscillation signal becomes higher than the frequency Frf, the frequency is sequentially down-converted to a frequency a. Therefore, the calculation unit 19 can specify the original frequency Frf by comparing the frequency of the IF signal after down-conversion.

  Further, when the RF signal of the frequency Frf is an RF signal corresponding to the frequency Frf2, the frequencies Frf-2Flo1 and Frf-2Flo2 = Frf-2 due to the high frequency of the double component of the frequencies Flo1, Flo2, and Flo3, respectively. Down-converted to (Flo1 + a), Frf-2Flo3 = Frf-2 (Flo1 + 2a) (where Frf> 2Flo3). That is, the frequency is down-converted in order by the frequency 2a. However, when the frequency of the double component of the local oscillation signal becomes higher than the frequency Frf, the frequency is down-converted in order by the frequency 2a. Therefore, the calculation unit 19 can identify the original frequency by comparing the frequency of the IF signal after down-conversion.

  When the RF signal having the frequency Frf is an RF signal corresponding to the frequency Frf1i, the local oscillation signals having the frequencies Flo1, Flo2, and Flo3 are used to generate the frequencies Flo1-Frf, Flo2-Frf = (Flo1 + a) −Frf, respectively. , Flo3-Frf = (Flo1 + 2a) -Frf. In other words, the frequency is sequentially down-converted by a. Therefore, the calculation unit 19 can identify the original frequency by comparing the frequency of the IF signal after down-conversion.

  FIG. 3 shows an example of a signal included in the RF signal and a signal included in the IF signal after down-conversion. As shown in the figure, the RF signal includes signals RF1 to RF6. The frequencies of the signals RF1 to RF6 are assumed to be frequencies Frf1 to Frf6, respectively. The frequency of the local oscillation signal LO1 is Flo1, the frequency of the local oscillation signal LO2 is Flo2 = Flo1 + a, the frequency of the local oscillation signal LO3 is Flo3 = Flo1 + 2a, and the frequency of the local oscillation signal LO4 is Flo4 = Flo1 + 3a. Also, the frequency Frf1 = Flo1 + a / 2, the frequency Frf2 = Ffr1 + a = Flo1 + 3a / 2, the frequency Frf3 = Ffr1 + 2a = Flo1 + 5a / 2, the frequency Frf4 = 2 × Flo1 + (Frf3-Flo1) = 2 × Flo1 + 5a / 2, the frequency Fr Flo2 + (Frf3-Flo2) = 2 × Flo2 + 3a / 2, and frequency Frf6 = 2 × Flo3 + 5a / 2.

  The frequency converter 15-1 multiplies the RF signal by the local oscillation signal LO1, so that the signal RF1, the signal RF2, the signal RF3, and the signal RF4 are the signal IF11, the signal IF12, the signal IF13, and the signal IF14 included in the signal IF1, respectively. Down converted. The frequency of the signal IF11 is a / 2, and the frequency of the signal IF12 is 3a / 2. Further, the signal IF13 and the signal IF14 are signals having a harmonic frequency relationship, and have the same frequency 5a / 2. Therefore, the power of the signal IF1 at the frequency a / 2 is the power of the signal RF1, the power of the frequency 3a / 2 is the power of the signal RF2, and the power of the frequency 5a / 2 is a value obtained by adding the powers of the signals RF3 and RF4.

  On the other hand, the frequency converter 15-2 multiplies the RF signal by the local oscillation signal LO2, so that the signal RF1, the signal RF2, the signal RF3, and the signal RF5 are respectively included in the signal IF2, the signal IF21, the signal IF22, the signal IF23, Downconverted to signal IF25. The signal IF21 and the signal IF22 are signals having an image frequency relationship, and have the same frequency a / 2. The signal IF 23 and the signal IF 25 are signals having a harmonic frequency relationship, and have the same frequency 3a / 2. The signal RF4 is also down-converted to an IF band signal having the same frequency a / 2 as the signal IF21 and the signal IF22. Therefore, the power of the frequency a / 2 of the signal IF2 is a value obtained by adding the powers of the signals RF1, RF2 and RF4, and the power of the frequency 3a / 2 is a value obtained by adding the powers of the signals RF3 and RF5. .

The frequency converter 15-3 multiplies the RF signal by the local oscillation signal LO3, so that the signal RF1, the signal RF2, the signal RF3, and the signal RF6 are included in the signal IF3, the signal IF31, the signal IF32, the signal IF33, Downconverted to signal IF36. The frequency of the signal IF31 is 3a / 2, and the frequency of the signal IF36 is 5a / 2. The signal IF 32 and the signal IF 33 are signals having an image frequency relationship, and have the same frequency a / 2. Therefore, the power of the frequency a / 2 is a value obtained by adding the powers of the signal RF2 and the signal RF3, the power of the frequency 3a / 2 is the power of the signal RF1, and the power of the frequency 5a / 2 is the power of the signal RF6.
Although not shown in the figure, the frequency converter 15-4 multiplies the RF signal by the local oscillation signal LO4, so that the signal RF1, the signal RF2, and the signal RF3 have frequencies 5a / 2, 3a / 2, Down converted to a / 2.

  Based on the frequency and power of each signal included in the signals IF1 to IF4 converted into the frequency domain by the Fourier transform units 18-1 to 18-4 as described above, the calculation unit 19 is a signal in the original RF band. The frequency and power of RF1 to RF6 can be calculated backward.

[Second Embodiment]
In the present embodiment, the frequency band of the RF signal that can contain the desired signal is extracted before the RF signal is input to the frequency converter. This reduces unnecessary signal leakage. Hereinafter, differences from the first embodiment will be described.

  FIG. 4 is a functional block diagram showing the configuration of the multi-band simultaneous sensing device 10a according to the second embodiment of the present invention. In the figure, the same parts as those in the multiple-band simultaneous sensing device 10 according to the first embodiment shown in FIG. The multi-band simultaneous sensing device 10a shown in the figure is different from the multi-band simultaneous sensing device 10 according to the first embodiment in that a band pass filter (BPF) is provided between the input unit 11 and the wide band low noise amplifier 12. ) 21 (filter unit).

  With the configuration shown in the figure, in the multiband simultaneous sensing device 10 a, the input unit 11 outputs the input RF signal to the bandpass filter 21. The band pass filter 21 extracts only a frequency band (frequency band to be sensed) in which a desired signal can be included in the RF signal, and outputs it to the wideband low noise amplifier 12. The broadband low noise amplifier 12 amplifies the RF signal passed through the band pass filter 21 and outputs the amplified RF signal to the distribution unit 13. Subsequent processing is the same as in the first embodiment.

  FIG. 5 is a functional block diagram showing another configuration of the multi-band simultaneous sensing device according to the embodiment. In the figure, the same parts as those in the multiple-band simultaneous sensing device 10 according to the first embodiment shown in FIG. The multiple-band simultaneous sensing device 10b shown in the figure is different from the multiple-band simultaneous sensing device 10 according to the first embodiment in that a bandpass filter (BPF) 22 (filter) is provided between the wideband low noise amplifier 12 and the distributor 13. Part). The function of the bandpass filter 22 is the same as that of the bandpass filter 21 shown in FIG.

  With the configuration shown in the figure, in the multi-band simultaneous sensing device 10 b, the broadband low noise amplifier 12 amplifies the RF signal input from the input unit 11 and outputs it to the bandpass filter 22. The bandpass filter 22 extracts only the frequency band in which the desired signal can be included in the RF signal, and outputs it to the distribution unit 13. The distributor 13 distributes the RF signal passed through the bandpass filter 22 and inputs the RF signal to the frequency converters 15-1 to 15-4. Subsequent processing is the same as in the first embodiment.

[Third Embodiment]
In the present embodiment, before the RF signal is input to the frequency converter, the RF signal radio frequency band that can include the desired signal and the RF signal radio frequency band that is frequency-converted by the harmonics of the local oscillation signal are obtained. Extract. Thereby, since the signal subjected to frequency conversion by the harmonic is explicitly included in the signal after Fourier transform, when the calculation unit 19 compares the signals, it is easy to specify the frequency of the signal subjected to frequency conversion by the harmonic. To do. Hereinafter, differences from the first embodiment will be described.

  FIG. 6 is a functional block diagram showing a configuration of a multi-band simultaneous sensing device 10c according to the third embodiment of the present invention. In the figure, the same parts as those in the multiple-band simultaneous sensing device 10 according to the first embodiment shown in FIG. The multiple-band simultaneous sensing device 10c shown in the figure is different from the multiple-band simultaneous sensing device 10 according to the first embodiment in that a multiband bandpass filter (Multiband BPF) is provided between the input unit 11 and the wideband low noise amplifier 12. It is a point provided with 31 (filter part).

  With the configuration shown in the figure, in the multiband simultaneous sensing device 10 c, the input unit 11 outputs the input RF signal to the multiband bandpass filter 31. The multiband bandpass filter 31 includes a frequency band in which a desired signal of the input RF signal can be included, and harmonics of the local oscillation signals LO1 to LO4 (for example, frequencies of 2 × Flo1, 2 × Flo2, 2 × Flo3, 2 × Flo4 signal) and a frequency band that is frequency-converted by the signal and output to the broadband low-noise amplifier 12. The broadband low noise amplifier 12 amplifies the RF signal passed through the multiband bandpass filter 31 and outputs the amplified RF signal to the distribution unit 13. Subsequent processing is the same as in the first embodiment.

  FIG. 7 is a functional block diagram showing another configuration of the multi-band simultaneous sensing device according to the embodiment. In the figure, the same parts as those in the multiple-band simultaneous sensing device 10 according to the first embodiment shown in FIG. The multi-band simultaneous sensing device 10d shown in the figure is different from the multi-band simultaneous sensing device 10 according to the first embodiment in that a multiband bandpass filter (Multiband BPF) is provided between the wideband low noise amplifier 12 and the distributing unit 13. 32 (filter part). The function of the multiband bandpass filter 32 is the same as the function of the multiband bandpass filter 31 shown in FIG.

  With the configuration shown in the figure, in the multiband simultaneous sensing device 10 d, the broadband low noise amplifier 12 amplifies the RF signal input from the input unit 11 and outputs the amplified RF signal to the multiband bandpass filter 32. The multiband bandpass filter 32 passes the frequency band in which the desired signal of the input RF signal can be included and the frequency band frequency-converted by the harmonics of the local oscillation signals LO1 to LO4, and outputs them to the distribution unit 13 To do. The distribution unit 13 distributes the RF signal passed by the multiband bandpass filter 32 and inputs the RF signal to the frequency converters 15-1 to 15-4. Subsequent processing is the same as in the first embodiment.

[Fourth Embodiment]
In the present embodiment, after filtering the frequency band of the RF signal, the signal in the high frequency band is amplified using the broadband low noise amplifier before the RF signal is input to the frequency converter. Hereinafter, differences from the above-described embodiment will be described.

  FIG. 8 is a functional block diagram showing a configuration of a multi-band simultaneous sensing device according to the fourth embodiment of the present invention. In this figure, the same parts as those in the multiband simultaneous sensing device 10d according to the third embodiment shown in FIG. The multi-band simultaneous sensing device 10e shown in the figure is different from the multi-band simultaneous sensing device 10d according to the third embodiment in that a wide band is low between the distributor 13 and the frequency converters 15-1 to 15-4. This is a point provided with noise amplifiers 41-1 to 41-4.

  With the configuration shown in the figure, in the multiband simultaneous sensing device 10e, the distribution unit 13 outputs the RF signal output from the multiband bandpass filter 32 to the wideband low noise amplifiers 41-1 to 41-4. The broadband low noise amplifier 41-i (i is an integer of 1 to 4) amplifies the high frequency band of the RF signal input from the distribution unit 13, and outputs the amplified signal to the frequency converter 15-i. This high frequency band includes at least all the bands in which the desired signal can be included in the RF signal. The frequency converter 15-i multiplies the local oscillation signal output from the corresponding local oscillation signal output unit 14-i by the RF signal input from the wideband low noise amplifier 41-i, and the frequency is converted by multiplication. The IF band signal is output to the corresponding low-pass filter 16-i. Subsequent processing is the same as in the first embodiment.

  In the figure, the configuration in which the broadband low-noise amplifiers 41-1 to 41-4 are added to the multi-band simultaneous sensing device 10d of the third embodiment has been described. However, the multi-band simultaneous sensing device of the second embodiment is described. 10a, 10b, a configuration including wideband low noise amplifiers 41-1 to 41-4 between the distribution unit 13 and the frequency converters 15-1 to 15-4 of the multiband simultaneous sensing device 10c of the third embodiment. It is good.

[Fifth Embodiment]
In the present embodiment, the power level is adjusted using a variable gain amplifier or a variable attenuator before the RF signal is input to the frequency converter. Thereby, the variation in the signal level obtained after Fourier transform is reduced. Hereinafter, differences from the above-described first embodiment will be described.

  FIG. 9 is a functional block diagram showing a configuration of a multi-band simultaneous sensing device 10f according to the fifth embodiment of the present invention. In the figure, the same parts as those in the multiple-band simultaneous sensing device 10 according to the first embodiment shown in FIG. The multiple-band simultaneous sensing device 10f shown in the figure is different from the multiple-band simultaneous sensing device 10 according to the first embodiment in that a gain adjustment circuit 51 is provided between the wideband low noise amplifier 12 and the distribution unit 13. . For the gain adjustment circuit 51, a variable gain amplifier or a variable attenuator can be used.

  With the configuration shown in the figure, in the multiband simultaneous sensing device 10f, the broadband low noise amplifier 12 amplifies the RF signal input from the input unit 11 and outputs the amplified RF signal to the gain adjustment circuit 51. The gain adjustment circuit 51 adjusts the power level by amplifying or attenuating the gain of the input RF signal, and outputs it to the distribution unit 13. The distribution unit 13 distributes the RF signal whose power level is adjusted by the gain adjustment circuit 51 and inputs the RF signal to the frequency converters 15-1 to 15-4. Subsequent processing is the same as in the first embodiment.

  In addition, although the structure which added the gain adjustment circuit 51 to the multiple band simultaneous sensing apparatus 10 of 1st Embodiment was demonstrated in the figure, multiple band simultaneous sensing apparatus 10a, 10b of 2nd Embodiment, 3rd, The gain adjustment circuit 51 may be provided between the broadband low-noise amplifier 12 and the distribution unit 13 of the multiple-band simultaneous sensing devices 10c and 10d of the embodiment and the multiple-band simultaneous sensing device 10e of the fourth embodiment.

  FIG. 10 is a functional block diagram showing another configuration of the multi-band simultaneous sensing device according to the embodiment. In the figure, the same parts as those in the multiple-band simultaneous sensing device 10 according to the first embodiment shown in FIG. The multiple-band simultaneous sensing device 10g shown in the figure is different from the multiple-band simultaneous sensing device 10 according to the first embodiment in that gain adjustment is performed between the distribution unit 13 and the frequency converters 15-1 to 15-4. It is a point provided with circuits 52-1 to 52-4. The functions of the gain adjustment circuits 52-1 to 52-4 are the same as those of the gain adjustment circuit 51.

  With the configuration shown in the figure, in the multiband simultaneous sensing device 10g, the distribution unit 13 outputs the RF signal amplified by the wideband low noise amplifier 12 to the gain adjustment circuits 52-1 to 52-4. The gain adjustment circuit 52-i (i is an integer of 1 or more and 4 or less) adjusts the power level by amplifying or attenuating the gain of the RF signal input from the distribution unit 13, and outputs the result to the frequency converter 15-i. . The frequency converter 15-i multiplies the local oscillation signal output from the corresponding local oscillation signal output unit 14-i by the RF signal whose gain level is adjusted by the gain adjustment circuit 52-i, and the frequency is converted by multiplication. The IF band signal is output to the corresponding low-pass filter 16-i. Subsequent processing is the same as in the first embodiment.

  In addition, although the structure which added the gain adjustment circuit 51 to the multiple band simultaneous sensing apparatus 10 of 1st Embodiment was demonstrated in the figure, multiple band simultaneous sensing apparatus 10a, 10b of 2nd Embodiment, 3rd, The gain adjusting circuit 52-1 between the multiband simultaneous sensing devices 10c and 10d of the embodiment and the distribution unit 13 of the multiband simultaneous sensing device 10e of the fourth embodiment and the frequency converters 15-1 to 15-4, respectively. It is good also as a structure provided with -52-4.

  Some functions of the multiple-band simultaneous sensing devices 10, 10a, 10b, 10c, 10d, 10e, 10f, and 10g in the above-described embodiments may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

  It can be used for a device that receives a broadband wireless signal.

10, 10a, 10b, 10c, 10d, 10e, 10f, 10g Multiple band simultaneous sensing device 11 Input unit 12 Broadband low noise amplifier (wideband low noise amplification unit)
13 Distribution unit 14-1, 14-2, 14-3, 14-4 Local oscillation signal output unit 15-1, 15-2, 15-3, 15-4 Frequency converter (frequency conversion unit)
16-1, 16-2, 16-3, 16-4 Low-pass filters 17-1, 17-2, 17-3, 17-4 Analog-digital converter (analog-digital converter)
18-1, 18-2, 18-3, 18-4 Fourier transform unit 19 Calculation unit 21, 22 Band pass filter (filter unit)
31, 32 Multiband bandpass filter (filter part)
41-1, 41-2, 41-3, 41-4 Wideband low noise amplifier (amplifier)
51, 52-1, 52-2, 52-3, 52-4 Gain adjustment circuit (gain adjustment unit)

Claims (6)

A wideband low noise amplification unit, a distribution unit, a local oscillation signal output unit, a frequency conversion unit, a low-pass filter, an analog-digital conversion unit, a plurality of sets of Fourier transform units, and a calculation unit,
The broadband low noise amplification unit amplifies a radio signal in a radio frequency band,
The distribution unit distributes the radio signal amplified by the broadband low noise amplification unit,
The local oscillation signal output unit outputs a local oscillation signal having a predetermined frequency or a local oscillation signal having a frequency obtained by adding an integer multiple of a predetermined differential frequency to the predetermined frequency.
The frequency conversion unit performs frequency conversion by multiplying the local oscillation signal output from the corresponding local oscillation signal output unit by the radio signal distributed by the distribution unit,
The low-pass filter passes a predetermined frequency band of the radio signal frequency-converted by the corresponding frequency converter,
The analog-to-digital conversion unit converts the radio signal after frequency conversion that has been passed by the corresponding low-pass filter from analog to digital,
The Fourier transform unit performs Fourier transform on the radio signal after frequency conversion converted into digital by the corresponding analog-digital conversion unit, and converts the signal into a frequency domain signal,
The arithmetic unit identifies a frequency of a signal included in the radio signal based on a frequency domain signal converted by the plurality of Fourier transform units.
A multi-band simultaneous sensing device characterized by that. A filter unit that performs a filtering process that allows the radio signal in a radio frequency band including a desired signal to pass;
The filter unit performs the filtering process on the received radio signal and outputs the filtered signal to the broadband low noise amplification unit, or performs the filtering process on the radio signal amplified by the broadband low noise amplification unit and distributes the signal. Output to the
The multiple-band simultaneous sensing device according to claim 1. A radio frequency band including a desired signal, and a filter unit that performs a filtering process that passes the radio signal in a radio frequency band that is frequency-converted by a harmonic of the local oscillation signal;
The filter unit performs the filtering process on the received radio signal and outputs the filtered signal to the broadband low noise amplification unit, or performs the filtering process on the radio signal amplified by the broadband low noise amplification unit and distributes the signal. Output to the
The multiple-band simultaneous sensing device according to claim 1. Amplifying the radio signal distributed by the distribution unit, further comprising a plurality of amplification units that output to the corresponding frequency conversion unit,
The multi-band simultaneous sensing device according to any one of claims 1 to 3, characterized in that: A gain adjusting unit that adjusts the gain of the radio signal before being input to the frequency converting unit after being amplified by the wideband low noise amplifying unit;
The multi-band simultaneous sensing device according to any one of claims 1 to 4, wherein the multi-band simultaneous sensing device is characterized. Multi-band simultaneous sensing comprising a broadband low-noise amplification unit, a distribution unit, a local oscillation signal output unit, a frequency conversion unit, a low-pass filter, an analog-digital conversion unit, a Fourier transform unit, and a calculation unit A multi-band simultaneous sensing method executed by an apparatus,
The broadband low noise amplification unit amplifies a radio signal in a radio frequency band,
The distribution unit distributes the radio signal amplified by the wideband low noise amplification unit,
The local oscillation signal output unit outputs a local oscillation signal having a predetermined frequency, or a local oscillation signal having a frequency obtained by adding an integer multiple of a predetermined differential frequency to the predetermined frequency,
The frequency conversion unit performs frequency conversion by multiplying the local oscillation signal output from the corresponding local oscillation signal output unit by the radio signal distributed by the distribution unit,
The low-pass filter passes a predetermined frequency band of the radio signal frequency-converted by the corresponding frequency converter,
The analog-to-digital converter converts the radio signal after frequency conversion that has been passed by the corresponding low-pass filter from analog to digital,
The Fourier transform unit performs Fourier transform on the radio signal after frequency conversion converted into digital by the corresponding analog-digital conversion unit, and converts it to a frequency domain signal,
The calculation unit specifies a frequency of a signal included in the radio signal based on a frequency domain signal converted by the plurality of Fourier transform units.
A multi-band simultaneous sensing method characterized by the above.

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