JP3474070B2 - Reception analyzer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving analyzer, and particularly to a high frequency signal in a wide frequency range which is instantaneously received without widening the receiving bandwidth and has a high receiving speed and a high receiving sensitivity. The present invention relates to a reception analysis device that receives signals at the same time and is excellent in size and weight.

[0002]

2. Description of the Related Art FIG . 8 is a system configuration diagram of a conventional reception analyzer. The reception analyzer shown in FIG. 8 can analyze two high-frequency signals having different frequencies, and the antenna 1A, 1
B, mixer circuits 2A and 2B, local oscillators 3A and 3B, band pass filters 4A and 4B, and receivers 5A and 5B. The antenna 1A, the mixer circuit 2A, the local oscillator 3A, the bandpass filter 4A and the receiver 5A constitute a receiver for analyzing a high frequency signal of one frequency. Aerial 1
B, the mixer circuit 2B, the local oscillator 3B, the bandpass filter 4B and the receiver 5B constitute a receiver for analyzing a high frequency signal of the other one of the frequencies. That is, the reception analyzer is equipped with two reception analyzers that analyze substantially two high-frequency signals.

Next, the operation of the above-mentioned reception analyzer will be described. The high frequency signal f1 having one frequency is taken into the reception analysis device from the antenna 1A. The high frequency signal f1 received by the antenna 1A is combined with the signal oscillated from the local oscillator 3A in the mixer circuit 2A and frequency-converted into an intermediate frequency signal. Thereafter, the band pass filter 4A removes the image frequency component from the intermediate frequency signal, extracts only the required intermediate frequency signal, and analyzes the frequency of the high frequency signal from the required intermediate frequency signal in the receiver 5A. Further, the high frequency signal f2 having another frequency is taken into the reception analysis device from the antenna 1B. High frequency signal f2 received by antenna 1B
Is combined with the signal oscillated from the local oscillator 3B in the mixer circuit 2B and converted into an intermediate frequency signal. Thereafter, the band pass filter 4B removes the image frequency component from the intermediate frequency signal, extracts only the required intermediate frequency signal, and analyzes the frequency of the high frequency signal from the required intermediate frequency signal in the receiver 5B.

In the conventional receiving and analyzing apparatus constructed as described above, there is a problem that the receiving and analyzing apparatus becomes large in scale because a receiving and analyzing apparatus corresponding to the frequency of the high frequency signal to be received is required.

As a technique for solving this kind of problem, Japanese Unexamined Patent Publication No. 5-300044 discloses a command receiver for receiving two high frequency signals. FIG. 9 is a system configuration diagram of the command receiver disclosed in the above publication. The command receiver includes antennas 1A and 1B, bandpass filters 4A and 4B, a high frequency signal synthesizer 6, an input amplifier 7, a mixer circuit 2, a local oscillator 3, an intermediate frequency amplifier 8 and a receiver 5. Antennas 1A and 1B receive high frequency signals having different frequencies.

Next, the operation of the command receiver will be described. The high frequency signal f1 is received by the antenna 1A, and the received high frequency signal f1 is received by the band pass filter 4A.
And is input to the high frequency signal synthesizer 6. The high frequency signal f2 is received by the antenna 1B, and the received high frequency signal f2 is input to the high frequency signal synthesizer 6 through the band pass filter 4B. The input high frequency signals f1 and f2 are respectively combined in the high frequency signal combiner 6, and the combined high frequency signal f1 + f2 is amplified in the input amplifier 7. The high frequency signal f1 + f2 amplified by the input amplifier 7 is combined with the signal having a frequency of | f1 + f2 | / 2 oscillated from the local oscillator 3 in the mixer circuit 2 and the same intermediate frequency signal | f1.
The frequency is converted to −f2 | / 2. Thereafter, the frequency-converted intermediate frequency signal is amplified in the intermediate frequency amplifier 8, and the amplified intermediate frequency signal is subjected to frequency analysis in the receiver 5.

[0007]

The above-mentioned command receiver can effectively receive a plurality of frequencies by one receiver when special code modulation for each frequency is performed as in digital communication. There is. However, when receiving a plurality of high frequency signals that are not uniquely modulated for each frequency, there is a problem that it is not possible to determine which frequency of the high frequency signal is received.

The present invention has been made to solve the above problems. Therefore, an object of the present invention is to provide a reception analysis apparatus capable of simultaneously receiving a plurality of high frequency signals having different frequencies by converting the same intermediate frequency signal by an average frequency signal and distinguishing each frequency of the plurality of high frequency signals. It is in. Further, the present invention is small and lightweight,
Moreover, it is to provide a reception analysis device capable of receiving a wide band at high speed.

[0009]

In order to solve the above-mentioned problems, the invention described in claim 1 is, in a receiving analyzer, an antenna for receiving a plurality of high-frequency signals having different frequencies, and the plurality of high-frequency signals. A local oscillator that oscillates an average frequency signal obtained by averaging the frequencies of signals, and a mixer circuit that synthesizes an average frequency signal oscillated from the local oscillator and a high frequency signal received by the antenna to perform frequency conversion into an intermediate frequency signal A frequency conversion circuit having a frequency conversion circuit based on the average frequency signal modulated by the modulation circuit in the frequency conversion circuit. Of the received high frequency signal, and of the high frequency signal received based on the modulated intermediate frequency signal. A high-frequency signal receiver for specifying the wave number, those having a. The invention described in claim 2 is the frequency conversion circuit of the reception analyzer according to claim 1, wherein the plurality of high-frequency signals received by the antenna are:
The same average frequency signal oscillated from each local oscillator and modulated by the modulation circuit is combined by the mixer circuit, and frequency conversion is performed to the same intermediate frequency signal. According to a third aspect of the present invention, in the reception analyzer according to the first or second aspect, an FM modulation circuit that performs FM modulation of a sawtooth wave on the average frequency signal is used as the modulation circuit. Is. The invention described in claim 4 is the reception analyzer according to any one of claims 1 to 3, wherein the local oscillator is connected to an intermediate frequency control circuit, and a control signal of the intermediate frequency control circuit is provided. Based on this, an average frequency signal is oscillated. According to a fifth aspect of the present invention, in the reception analysis apparatus according to the first aspect, the local oscillator oscillates a first average frequency signal obtained by averaging frequencies of two high frequency signals having different frequencies. A local oscillator and a second local oscillator that oscillates a second average frequency signal obtained by averaging the frequencies of two other high-frequency signals having different frequencies, and the modulation circuit oscillates from the first local oscillator. A first modulation circuit that performs modulation for specifying the respective frequencies of the two high-frequency signals in the first average frequency signal; and a second average frequency signal that oscillates from the second local oscillator in each of the other two high-frequency signals. And a second modulation circuit that performs modulation for specifying the frequency of, and specifies the respective frequencies of the four high-frequency signals received by the high-frequency signal receiver on the antenna. It is. According to a sixth aspect of the present invention, in the reception analyzer of the fifth aspect, the modulation cycle of the first modulation circuit and the modulation cycle of the second modulation circuit are different. The invention described in claim 7 is the reception analyzer according to claim 1, 5 or 6, wherein the local oscillator is a half value of a frequency difference between two different high frequency signals.
Oscillates a frequency signal that becomes , the modulation circuit performs modulation for specifying the frequency of the high frequency signal in the frequency signal oscillated from the local oscillator, and the frequency conversion circuit is modulated by the modulation circuit and oscillates from the local oscillator. has been based on the frequency signal <br/>, it is to frequency conversion to the same intermediate frequency signal of frequency averaged for a plurality of high frequency signals. Claim
Invention described in 8, in the receiving analyzer according to claim 7, the frequency signal to the high frequency signal oscillated from the local oscillator in the transmitter side which is received into the antenna
The same modulation as that applied to the signal is applied, and the high frequency signal received by the antenna is frequency-converted into an intermediate frequency signal based on the modulated frequency signal, thereby increasing the modulation component of the intermediate frequency signal and increasing the high frequency. The frequency of the signal is specified . According to a ninth aspect of the present invention, in the reception analysis apparatus according to the seventh aspect, the high frequency signal received by the antenna is opposite to the modulation applied to the frequency signal oscillated from the local oscillator on the transmitter side. Modulation is performed, and the high frequency signal received by the antenna is frequency-converted into an intermediate frequency signal based on the frequency signal subjected to the inverse modulation, thereby increasing the modulation component of the intermediate frequency signal and specifying the frequency of the high frequency signal. Is to do . According to a tenth aspect of the present invention, in the reception analysis apparatus according to the first aspect, the mixer circuit is set in a range in which an intermediate frequency conversion range does not pass an image frequency.

[0010]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1 Hereinafter, an embodiment of the present invention will be described. 1 is a system configuration diagram of a reception analysis apparatus according to Embodiment 1 of the present invention. The reception analyzer according to the present embodiment includes an antenna 11, a mixer circuit 12, a local oscillator 13, a bandpass filter 14, a high frequency signal receiver 15, a modulation circuit 17 and an intermediate frequency control circuit 16. The antenna 11 receives a plurality of high frequency signals f1 and f2 having different frequencies.

The local oscillator 13 is connected to an intermediate frequency control circuit 16, and an average frequency signal | f1 + f2 | / 2 obtained by averaging the frequencies of a plurality of high frequency signals f1 and f2 based on a control signal of the intermediate frequency control circuit 16. To oscillate. The modulation circuit 17 performs modulation for specifying the frequency of the high frequency signal on the average frequency signal oscillated from the local oscillator 13, and the modulated average frequency signal {| f1 + f2 | /
2} + f (t) is generated. In the present embodiment, the modulation circuit 17 is an FM modulation circuit that performs FM modulation of a sawtooth wave on the average frequency signal. The mixer circuit 12 is
The average frequency signal oscillated from the local oscillator 13 and modulated by the modulation circuit 17 and the high frequency signals f1 and f2 received by the antenna 11 are combined to perform frequency conversion into the same intermediate frequency signal. The mixer circuit 12 and the local oscillator 13 construct a frequency conversion circuit. The high frequency signal receiver 15
Receives the same intermediate frequency signal that has been frequency-converted by the frequency conversion circuit, and specifies the frequency of the high frequency signal received from the intermediate frequency signal.

Next, the operation of the above-mentioned reception analyzer will be described. In the antenna 11, two high frequency signals f1 and f2 (when f1> f2) having different frequencies are received. The received high frequency signals f1 and f2 are respectively combined with the signal oscillated from the local oscillator 13 in the mixer circuit 12 and converted into an intermediate frequency signal. The local oscillator 13 oscillates an average frequency signal (f1 + f2) / 2 obtained by averaging the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2 by the control signal of the intermediate frequency control circuit 16.

The frequency-converted intermediate frequency signals of the high-frequency signals f1 and f2 are obtained by the following equation (however,
By the definition of f1> f2, f1> (f1 + f2) / 2>
It becomes f2. ). Intermediate frequency of f1: f1-{(f1 + f2) / 2} =
(F1-f2) / 2 Intermediate frequency of f2: {(f1 + f2) / 2} -f2 =
(F1-f2) / 2

FIG. 2A is a diagram showing the relationship between frequency and time before frequency conversion, and FIG. 2B is a diagram showing the relationship between frequency and time after frequency conversion. As shown in FIG. 2A, a frequency (f1 + f2) / 2 obtained by averaging the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2 received in the antenna 11 is used as the average frequency signal oscillated from the local oscillator 13. used. In this case, FIG. 2 (B)
When frequency conversion is performed on the intermediate frequency signal based on the average frequency signal oscillated from the local oscillator 13, the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2 cannot be distinguished and the high frequency signal is The frequency of the high frequency signal cannot be specified in the receiver 15.

In the reception analyzer according to the present embodiment, the average frequency oscillated from local oscillator 13 is modulated to specify the frequency of high frequency signal f1 and the frequency of high frequency signal f2. FIG. 3A is a diagram showing a relationship between frequency and time before frequency conversion when modulation is performed, and FIG. 3B is a diagram showing a relationship between frequency and time after frequency conversion. The modulation of the average frequency signal is performed by the modulation circuit 17, and the modulation circuit 17 has a sawtooth wave F.
Perform M modulation. FIG. 3A shows an average frequency signal in which the FM modulation of the sawtooth wave is performed. In this way, the local oscillator 1
When FM modulation is applied to the average frequency signal oscillated from 3, the high frequency signals f1 and f2 are frequency converted into the intermediate frequency signals shown in FIG. Intermediate frequency of f1: f1-{(f1 + f2) / 2} + f
(T) = {(f1-f2) / 2} -f (t) Intermediate frequency of f2: {(f1 + f2) / 2} + f (t)
-F2 = {(f1-f2) / 2} + f (t)

As shown in the above equation and FIG. 3B, the modulation circuit 1 is applied to the average frequency signal oscillated from the local oscillator 13.
By applying FM modulation in 7, the intermediate frequency signal of the high frequency signal f1 and the intermediate frequency signal of the high frequency signal f2 are oppositely modulated. That is, by adding the FM modulation f (t) of the sawtooth wave to the average frequency by the modulation circuit 17, the intermediate frequency signal of the high-frequency signal f1 and the intermediate frequency signal of the high-frequency signal f2 are FM-modulated with opposite slopes. Join. The frequency can be specified by detecting with the high-frequency signal receiver 15 whether the FM modulation slope of the intermediate frequency signal is a positive slope or a negative slope, and the high-frequency signal f1 can be specified.
Or the high frequency signal f2 can be determined.
This determination can be easily realized by, for example, using software, sampling the intermediate frequency signal at specific time intervals, and detecting the slope of the sampled intermediate frequency signal.

Embodiment 2 This Embodiment 2 describes a reception analysis apparatus for analyzing the frequencies of four high frequency signals having different frequencies. FIG. 4 is a system configuration diagram of the reception analysis device according to the second embodiment of the present invention. The reception analyzer comprises two types of local oscillators 13A and 13B to construct a frequency conversion circuit. The local oscillator 13A averages the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2 received by the antenna 11 with an average frequency signal (f1 + f2) / 2 (however, f1
> F2) is oscillated. The local oscillator 13A is connected to the intermediate frequency control circuit 16A and the modulation circuit 17A, respectively.
The average frequency signal oscillated from the local oscillator 13A is controlled by the intermediate frequency control circuit 16A, and the modulation circuit 17A
The FM modulation f for specifying the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2 in the average frequency signal
(T) is performed. On the other hand, the local oscillator 13B averages the frequency of the high frequency signal f3 received by the antenna 11 and the frequency of the high frequency signal f4 (f3 + f).
4) / 2 (however, f3> f4) is oscillated. The local oscillator 13B is connected to the intermediate frequency control circuit 16B and the modulation circuit 17B, respectively. The average frequency signal oscillated from the local oscillator 13B is controlled by the intermediate frequency control circuit 16B, and the modulation circuit 17B FM modulation g (t) for specifying the frequency of the high frequency signal f3 and the frequency of the high frequency signal f4 in the average frequency signal. Is done. FM modulation g
The modulation cycle of (t) is set separately from the modulation cycle of FM modulation f (t). In the reception analyzer configured as above, the four high-frequency signals f received by the antenna 11 are
The respective frequencies of 1, f2, f3 and f4 can be analyzed in the high frequency signal receiver 15.

Embodiment 3 This Embodiment 3 describes a case where the average frequency signal oscillated from the local oscillator 13 of the reception analyzer described in Embodiment 1 is replaced. FIG. 5 (A) is a diagram showing a relationship between frequency and time before frequency conversion in the case where modulation is executed in the reception analyzer according to the third embodiment of the present invention, and FIG. 5 (B) is after frequency conversion. It is a figure which shows the relationship between frequency and time. In the reception analyzer according to the present embodiment, as shown in FIG. 5A, the average frequency signal oscillated from the local oscillator 13 (see FIG. 1 described above) is converted into the high frequency signal f1 received by the antenna 11. Frequency that is half the difference between the frequency and the frequency of the high frequency signal f2
The signal (f1-f2) / 2 is used and the FM modulation f (t) is added to this frequency signal . The frequency signal is oscillated from the local oscillator 13 by the control signal from the intermediate frequency control circuit 16. Further, the modulation circuit 17 applies FM modulation of a sawtooth wave to the frequency signal . And FIG.
(B), the high-frequency signal f1, f2 received at antenna 11, a frequency signal of the FM modulation is applied
The frequency is converted into the same intermediate frequency signal (f1 + f2) / 2 in the mixer circuit 12 based on the signal. Since the intermediate frequency signal of the high frequency signal f1 and the intermediate frequency signal of the high frequency signal f2 have opposite FM modulation slopes, the high frequency signal receiver 15 can distinguish between the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2. .

The reception analysis apparatus according to this embodiment can be applied to the reception analysis apparatus according to the second embodiment described above. That is, in the reception analyzer, when four high frequency signals f1, f2, f3 and f4 having different frequencies are received by the antenna 11, the local oscillator 13A determines the difference between the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2 . Frequency that becomes half value
It oscillates several signals . This frequency signal is F
The M modulation f (t) is added. Similarly, the local oscillator 13
B oscillates a frequency signal that is half the difference between the frequency of the high frequency signal f3 and the frequency of the high frequency signal f4. This frequency
The signal is FM-modulated g (t) by the modulation circuit.
Then, the high frequency signals f1 and f2 are frequency-converted to the same intermediate frequency obtained by averaging the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2 based on the frequency signal to which the FM modulation f (t) is added. The high frequency signals f3 and f4 are
Based on the frequency signal to which the FM modulation g (t) is added, the frequency is converted into the same intermediate frequency signal obtained by averaging the frequencies of the high frequency signal f3 and the high frequency signal f4. The four high frequency signals f1, f2, f3 and f4 which have been frequency-converted into these intermediate frequency signals are the high frequency signal receiver 15
Each frequency is specified in.

Fourth Embodiment In the fourth embodiment, a frequency signal oscillated from the local oscillator of the reception analyzer described in the third embodiment and a high frequency signal transmitted from the transmitter are respectively modulated. The case will be described. FIG. 6 (A) is a diagram showing a relationship between frequency and time before frequency conversion in the case where modulation is executed in the reception analyzer according to the fourth embodiment of the present invention, and FIG. 6 (B) is after frequency conversion. It is a figure which shows the relationship between frequency and time.

In the reception analyzer according to the present embodiment
6A, the high frequency signal f1 + f to which the FM modulation f (t) of the sawtooth wave is added on the transmitter side as shown in FIG.
Each of (t) and f2 + f (t) is received by the antenna 11. The local oscillator 13 has a frequency that is half the difference between the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2.
Signal (f1-f2) / 2 oscillates and this frequency signal to the modulation circuit 17 by FM modulation of the same saw-tooth wave and FM modulation f (t) of the sawtooth wave applied by the transmitting apparatus side f (T)
Is added ({(f1-f2) / 2} + f (t)).
Then, as shown in FIG. 6B, the high frequency signals f1 + f (t) and f2 + f (t) received in the antenna 11 are received.
Are frequency-converted into the same intermediate frequency signal based on the frequency signals to which the FM modulation is applied. High frequency signal f
1 + f (t) is frequency-converted into an intermediate frequency signal (f1 + f2) / 2, and the high frequency signal f2 + f (t) is frequency-converted into an intermediate frequency signal {(f1 + f2) / 2} + 2f (t). Intermediate frequency where this FM modulation component difference is noticeable
The several signals are analyzed in the high frequency signal receiver 15 and
The frequency of the high frequency signal received on line 11 is determined.
Be done. The difference between the FM modulation components of the intermediate frequency signal is clearly shown.
As a result, the detection accuracy of the high-frequency signal receiver 15 is reduced.
You can harmonize.

Fifth Embodiment In the fifth embodiment, a frequency signal oscillated from the local oscillator of the reception analyzer described in the third embodiment and a high frequency signal transmitted from the transmitter are reversely modulated. The case where is added will be described. FIG. 7A is a diagram showing a relationship between frequency and time before intermediate frequency conversion when modulation is performed in the reception analysis apparatus according to the fifth embodiment of the present invention, and FIG. 7B is intermediate frequency conversion. It is a figure which shows the relationship between subsequent frequency and time.

As shown in FIG . 7A, each of the high frequency signals f1 + f (t) and f2 + f (t) to which the FM modulation f (t) of the sawtooth wave is added on the transmitter side is received by the antenna 11. It The local oscillator 13 determines the half value of the difference between the frequency of the high frequency signal f1 and the frequency of the high frequency signal f2.
Consisting oscillates a frequency signal (f1-f2) / 2, opposite the circumferential wave <br/> number This signal and FM modulation f sawtooth made in the transmitting apparatus side by the modulating circuit 17 (t) FM modulation of the sawtooth wave of -f (t) is added ({(f1-f2) / 2}-
f (t)). Then, as shown in FIG. 7B, the high frequency signals f1 + f (t), f received in the antenna 11
2 + f (t) is the frequency to which the opposite FM modulation is applied
Frequency conversion is performed on the basis of the several signals into the same intermediate frequency signal. The high frequency signal f1 + f (t) is an intermediate frequency signal {(f
1 + f2) / 2} + 2f (t)} , and the high frequency signal f2 + f (t) is converted to the intermediate frequency signal (f1 + f).
2) The frequency is converted to / 2 . Similar to the above, in the reception analysis apparatus according to the present embodiment, the difference between the FM modulation components of both intermediate frequency signals becomes significant.

In each of the reception analysis apparatus according to the fifth embodiment and the reception analysis apparatus according to the fourth embodiment, two types of local oscillators are provided as in the reception analysis apparatus according to the second embodiment. It is possible to construct a reception analyzer including 13A and 13B and capable of receiving four high frequency signals f1 to f4 having different frequencies.

Sixth Embodiment This sixth embodiment will describe an application example of the reception analysis apparatus according to the first embodiment (see FIG. 1 described above). In the reception analyzer, the image frequency generated when the high frequency signal is frequency-converted into the intermediate frequency signal is considerably higher than the frequency of the intermediate frequency signal. Therefore, when there is a margin in the reception sensitivity, by selecting the mixer circuit 12 in which the intermediate frequency conversion range does not pass the image frequency, the bandpass filter can be eliminated in the reception analysis device, so that the device can be downsized. realizable.

[0026]

As described above, according to the present invention, a plurality of high frequency signals having different frequencies are simultaneously received by converting them to the same frequency by the intermediate frequency, and the respective frequencies of the plurality of high frequency signals can be distinguished. An analyzer can be provided. Furthermore, the present invention, in addition to the above effects,
It is possible to provide a reception analysis device that is small and lightweight, and that can receive a wide band at high speed.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a reception analysis device according to a first embodiment of the present invention.

FIG. 2A is a diagram showing a relationship between frequency and time before frequency conversion, and FIG. 2B is a diagram showing a relationship between frequency and time after frequency conversion.

FIG. 3A is a diagram showing the relationship between frequency and time before frequency conversion when modulation is performed, and FIG. 3B is a diagram showing relationship between frequency and time after frequency conversion.

FIG. 4 is a system configuration diagram of a reception analysis device according to a second embodiment of the present invention.

5A is a diagram showing a relationship between frequency and time before frequency conversion when modulation is performed in the reception analyzer according to the third embodiment of the present invention, and FIG. 5B is a diagram after frequency conversion. It is a figure which shows the relationship between frequency and time.

FIG. 6A is a diagram showing a relationship between frequency and frequency before frequency conversion when modulation is performed in the reception analyzer according to the fourth embodiment of the present invention, and FIG. It is a figure which shows the relationship between frequency and time.

FIG. 7A is a diagram showing a relationship between frequency and time before frequency conversion when modulation is performed in the reception analyzer according to the fifth embodiment of the present invention, and FIG. 7B is a diagram after frequency conversion. It is a figure which shows the relationship between frequency and time.

FIG. 8 is a system configuration diagram of a conventional reception analyzer.
It

FIG. 9 is a system configuration diagram of a conventional command receiver.
It

[Explanation of symbols]

11 antenna, 12 mixer circuit, 13, 13A, 13
B local oscillator, 14 band pass filter, 15 high frequency signal receiver, 16, 16A, 16B intermediate frequency control circuit, 17, 17A, 17B modulation circuit.

Claims (10)

(57) [Claims] 1. An antenna for receiving a plurality of high frequency signals having different frequencies, a local oscillator for oscillating an average frequency signal obtained by averaging the frequencies of the plurality of high frequency signals, and an average frequency signal oscillated from the local oscillator. And a high-frequency signal received by the antenna, and a frequency conversion circuit having a mixer circuit for performing frequency conversion into an intermediate frequency signal, and modulation for specifying the frequency of the high-frequency signal to an average frequency signal oscillated from the local oscillator. A high frequency signal frequency-converted based on an average frequency signal modulated by the modulation circuit in the frequency conversion circuit and the frequency conversion circuit is received, and a frequency of the high frequency signal received based on the modulated intermediate frequency signal is specified. And a high-frequency signal receiver for controlling the reception and analysis device. 2. In the frequency conversion circuit, a plurality of high-frequency signals received by the antenna are respectively oscillated from a local oscillator and modulated by a modulation circuit. The reception analysis apparatus according to claim 1, wherein frequency conversion is performed on the frequency signal. 3. The reception analysis apparatus according to claim 1, wherein the modulation circuit is an FM modulation circuit that performs FM modulation of a sawtooth wave on the average frequency signal. 4. The local oscillator is connected to an intermediate frequency control circuit, and oscillates an average frequency signal based on a control signal of the intermediate frequency control circuit.
The reception analysis device according to claim 3. 5. The local oscillator includes a first local oscillator that oscillates a first average frequency signal obtained by averaging the frequencies of two high frequency signals having different frequencies, and a frequency of two other high frequency signals having different frequencies. A second local oscillator that oscillates a second average frequency signal that is obtained by averaging the first local oscillator and the first local oscillator that oscillates from the first local oscillator.
A first modulation circuit that performs modulation to specify the respective frequencies of the two high-frequency signals to the average frequency signal, and a second modulation frequency signal that oscillates from the second local oscillator to the other two.
A second modulation circuit that performs modulation for specifying respective frequencies of the two high-frequency signals, and specifies respective frequencies of the four high-frequency signals received by the antenna by the high-frequency signal receiver. Item 2. The reception analysis device according to item 1. 6. The reception analysis apparatus according to claim 5, wherein a modulation cycle of the first modulation circuit and a modulation cycle of the second modulation circuit are different from each other. 7. The local oscillator comprises two different high-frequency oscillators.
Oscillates a frequency signal that is half the frequency difference of the wave signal, and the modulation circuit is a frequency oscillated from the local oscillator.
Modulates to specify the frequency of the high frequency signal to the signal , the frequency conversion circuit, based on the frequency signal oscillated from the local oscillator modulated by the modulation circuit, the same intermediate frequency averaged frequencies of a plurality of high frequency signals 7. The reception analysis device according to claim 1, wherein the frequency is converted into a signal. 8. frequency to high frequency signals received on the antenna is oscillated from the local oscillator in the transmitter side
The same modulation as that applied to several signals was applied, and the high frequency signal received by the antenna was modulated.
By frequency-converted into an intermediate frequency signal based on the frequency signal, and increases the modulation component of the intermediate frequency signal, the receiving analyzer according to claim 7, characterized in that the specific frequency of the high frequency signal. 9. frequency to high frequency signal oscillated from the local oscillator in the transmitter side which is received into the antenna
The modulation component of the intermediate frequency signal is increased by applying the modulation opposite to the modulation applied to the several signals and performing the frequency conversion of the high frequency signal received by the antenna into the intermediate frequency signal based on the frequency signal to which the reverse modulation is added. The reception analyzer according to claim 7, wherein the frequency of the high frequency signal is specified. 10. The reception analysis apparatus according to claim 1, wherein the mixer circuit is set such that an intermediate frequency conversion range does not pass an image frequency.