JP2915875B2 - Asynchronous receiver for FH - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asynchronous receiver for receiving FH (frequency hopping) communication waves.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional asynchronous receiver for FH.
This will be described with reference to FIG. 10 and 1
1 is a conventional FH communication transmitter and receiver described in, for example, Saito, Tachikawa, "Mobile Communication Handbook", November 15, 1995, published by Ohmsha, pages 389 to 390. FIG. 3 is a diagram illustrating a configuration, and a diagram illustrating a frequency sequence of FH communication and a change timing thereof.

In FIG. 10, 1 is a modulator (FM) of transmission information, 2 is a frequency converter for converting the intermediate frequency of the converter 1 to a high frequency, 3 is a local oscillator for frequency hopping (frequency switching system), Reference numeral 4 denotes a high-frequency filter that removes unnecessary transmission waves, 5 denotes a power amplifier that amplifies a high-frequency signal to a power required for transmission, and 6 denotes a transmission antenna that radiates the transmission signal into the air.

In FIG. 1, reference numeral 7 denotes a receiving antenna for capturing a required signal, reference numeral 8 denotes a high-frequency amplifier for amplifying a weak received wave until necessary for internal processing, and reference numeral 9 denotes a device for converting a required high-frequency signal to an intermediate frequency. Local oscillator (frequency switching system), 10 is a frequency converter, 11 is an intermediate frequency filter,
Reference numeral 12 denotes a demodulator (frequency discriminator).

Next, the operation of the above-described conventional example will be described. On the transmitting side, a modulation input (transmission information) is first-order modulated (FM) by a modulator 1 and a frequency converter 2
Then, it is mixed with the output of the local oscillator 3 to become a high-frequency signal.

Since the local oscillator 3 is configured so that the frequency changes over time (frequency sequence) as shown in FIG. 11, for example, the output high-frequency signal changes accordingly, and FIG. The transmission and reception frequencies of the frequency sequence as shown are generated.

Since the frequency converter 2 generates two frequencies, that is, the sum and difference of the input frequencies, unnecessary waves are removed by the high-frequency filter 4 and amplified to the required power by the power amplifier 5.
Transmission is performed from the transmission antenna 6.

On the receiving side, the high frequency signal captured by the receiving antenna 7 is amplified by the high frequency amplifier 8 and mixed with the output of the local oscillator 9 by the frequency converter 10 to become the intermediate frequency.

Since the local oscillator 9 is configured to change to the same frequency at the same timing as the local oscillator 3 on the transmission side, the intermediate frequency is the same as the transmission side (no change).
Return to frequency.

Further, unnecessary waves are removed by the intermediate frequency filter 11 and the original information is reproduced by the demodulator 12 and output as a demodulated output.

[0011]

In the conventional transceiver for FH as described above, the local oscillators 3 on the transmitting side and the receiving side,
9 is that the transmission-side frequency sequence that becomes an ideal signal and its change timing must match, and a general receiver whose frequency sequence and its change timing are unknown cannot receive an FH communication wave. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and is intended for an FH capable of receiving an FH communication wave whose transmission-side FH frequency sequence and its change timing, which are ideal signals, are unknown. The aim is to obtain an asynchronous receiver.

[0013]

Means for Solving the Problems] FH for asynchronous receiver according to the present invention includes a receiving antenna to capture frequency hopping communication wave, a high frequency amplifier for amplifying a frequency hopping communication waves received, the frequency hopping communication wave a local oscillation unit that output the plurality of oscillation frequencies corresponding to the transmission hopping frequencies of the plurality of oscillation frequency is input, pre
Said frequency hopping amplified by said high frequency amplifier
A frequency converter that converts a communication wave into a plurality of intermediate frequencies corresponding to the plurality of oscillation frequencies, and an intermediate frequency filter that passes an intermediate frequency of a predetermined frequency from the plurality of intermediate frequencies and removes other unnecessary waves, This intermediate frequency fill
And a demodulator for demodulating an intermediate frequency of the predetermined frequency that has passed through the demodulator.

Further, in the FH asynchronous receiver according to the present invention, the local oscillation means includes a plurality of local oscillators for oscillating local frequencies corresponding to a plurality of transmission hopping frequencies, and the plurality of local oscillators are controlled by the frequency. It is connected in parallel to the converter.

Further, in the FH asynchronous receiver according to the present invention, the demodulator is an FM demodulator.

Further, in the FH asynchronous receiver according to the present invention, the demodulator is an AM demodulator.

Further, in the FH asynchronous receiver according to the present invention, the local oscillation means is a harmonic oscillator which oscillates a plurality of frequencies at regular frequency intervals.

Further, the asynchronous receiver for FH according to the present invention includes a filter for limiting a frequency between the frequency converter and the harmonic oscillator.

Further, in the FH asynchronous receiver according to the present invention, the filter is a band-pass filter that passes only a predetermined frequency.

Further, in the FH asynchronous receiver according to the present invention, the filter is a band elimination filter for removing only a predetermined frequency.

Further, in the FH asynchronous receiver according to the present invention, the local oscillation means comprises a plurality of local oscillators and a plurality of second frequency converters, and oscillates local frequencies corresponding to a plurality of transmission hopping frequencies. Is what you do.

[0022] The FH for asynchronous receiver according to the present invention, a receiving antenna to capture frequency hopping communication wave, a high frequency amplifier for amplifying a frequency hopping communication waves received,
A local oscillator that outputs a single oscillation frequency, and the single oscillation frequency is input and amplified by the high-frequency amplifier.
A frequency converter for converting the frequency hopping communication wave frequency between a medium-out group <br/> Dzu in the oscillation frequencies, said frequency
Set for each hopping frequency of hopping communication wave
And the intermediate frequency of the corresponding transmission hopping frequency
Multiple intermediate frequency filters that pass through and remove other unwanted waves
Filters and the intermediate frequency filters provided for each of these intermediate frequency filters.
A plurality of demodulators for demodulating in response to the transmission hopping, this
And a combiner for combining the demodulated outputs of the plurality of demodulators .

[0023] The FH for asynchronous receiver according to the present invention, a receiving antenna to capture frequency hopping communication wave, a high frequency amplifier for amplifying a frequency hopping communication waves received,
A local oscillator that outputs a single oscillation frequency, and the single oscillation frequency is input and amplified by the high-frequency amplifier.
A frequency converter for converting the frequency hopping communication wave frequency between a medium-out group <br/> Dzu in the oscillation frequencies, said frequency
Set for each hopping frequency of hopping communication wave
And the intermediate frequency of the corresponding transmission hopping frequency
A plurality of intermediate frequency filters that pass through and remove other unnecessary waves; a combiner that combines the outputs of the plurality of intermediate frequency filters ;
And a demodulator that demodulates the signal in accordance with the timing.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 First Embodiment A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of an FH asynchronous receiver according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing a frequency sequence and its change timing as the receiving principle of the first embodiment of the present invention. In the drawings, the same reference numerals indicate the same or corresponding parts. Ma
Also, an example in which the primary modulation is FM will be described.

In FIG. 1, 7 is a reception antenna for capturing a required signal, 8 is a high-frequency amplifier for amplifying a weak reception wave until necessary for internal processing, 10 is a frequency converter, 11 is an intermediate frequency filter, and 12 is demodulation. (Frequency discriminator).

In FIG. 1, reference numerals 13a to 13e denote local oscillators (single frequencies) that oscillate local frequencies (f1 to f5) corresponding to individual transmission / reception frequencies (hopping frequencies).

Next, the operation of the first embodiment will be described. Since the transmitting side is arbitrary (for example, the transmitter in FIG. 10), only the receiver is shown in FIG. Receive antenna 7
1 to the high-frequency amplifier 8 are the same as those in the related art.

In the first embodiment, the local oscillator 13a
13e, all the local oscillation frequencies corresponding to the hopping frequency are synthesized and input to the frequency converter 10, so that the frequency converter 10 transmits each of the transmission frequencies f1r to f1f.
5r correspond to the local oscillation frequencies f1 to f5.
Converted to a plurality of intermediate frequencies,
Is output. The intermediate frequency filter 11 has a predetermined frequency.
Pass the intermediate frequency (f1F) converted to wave number
The demodulator 12 removes unnecessary waves other than the
f1d to f5d can be obtained .

FIG. 2 shows this state. For example, in FIG.
In the period during which the transmission frequency f1r is received, a demodulation output f1d corresponding to the transmission frequency f1r is output (otherwise,
F1r-f2, f1r-f3, f1r-f4, f1r
-F5 is output to the intermediate frequency filter 11 as an unnecessary wave.
More removed. In the period during which the transmission frequency f3r is received, the demodulation output f3d corresponding to the transmission frequency f3r is output (other f3r-f1, f3r-f2, f).
3r-f4 and f3r-f5 are both unnecessary waves
It is removed by the frequency filter 11. ) . Transmission frequency f
The same applies to 2r, f4r, and f5r.

On the transmitting side, the signals are transmitted at different frequencies. However, since all of the transmitting frequencies f1r to f5r are output from one place, the information transmitted from the transmitting side can be reproduced.

Moreover, since the local oscillation frequency is not switched in this receiver, it is possible to asynchronously receive even if the ideal frequency sequence on the transmitting side and its change timing are incorrect.

Although the first embodiment has been described with reference to the case where the transmission frequency is five, any number of waves may be used as long as a local oscillator corresponding to the transmission frequency is prepared, and the same effect can be obtained.

Embodiment 2 FIG. Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a configuration of an FH asynchronous receiver according to Embodiment 2 of the present invention.

FIG. 3 shows a configuration provided with a demodulator (detector) 14 as an example when the primary modulation is AM. The configuration other than the demodulator 14 is the same as that of the first embodiment.

In the first embodiment, the case where the primary modulation on the transmission side is FM has been described. However, as long as a demodulator corresponding to the primary modulation method is prepared, any method can be used, and the same effect can be obtained. .

Embodiment 3 Third Embodiment A third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a diagram showing a configuration of an FH asynchronous receiver according to Embodiment 3 of the present invention.

An oscillator that oscillates at a plurality of frequencies at a constant frequency interval is called a high-frequency oscillator. An oscillator using this as a local oscillator is shown in FIG.

The oscillation frequency of the harmonic oscillator 15 is f1
To f5, the same effect as in the first embodiment having five individual local oscillators can be obtained.

Embodiment 4 Embodiment 4 of the present invention will be described with reference to FIG. FIG. 5 is a diagram showing a configuration of an FH asynchronous receiver according to Embodiment 4 of the present invention.

In the third embodiment, the purpose of receiving f1r to f5r can be achieved. However, since the first harmonic oscillator 15 has a wide-band oscillation frequency range and receives unnecessary frequencies, as shown in FIG. By using a local oscillator whose frequency is limited by the band-pass filter 16, frequencies other than the intended frequency can be removed.

Embodiment 5 FIG. Embodiment 5 of the present invention will be described with reference to FIG. FIG. 6 is a diagram showing a configuration of an FH asynchronous receiver according to Embodiment 5 of the present invention.

The band pass filter 16 of the fourth embodiment
Is replaced with a band elimination filter 17 in the fifth embodiment. FIG. 6 shows a case where f3r is not present in the hopping frequency, and the band elimination filter 17 uses f3r.
Is removed from the local oscillation frequency f3.

Incidentally, depending on the hopping frequency, a configuration having both the band elimination filter 17 and the band-pass filter 16 is also possible.

Embodiment 6 FIG. Embodiment 6 of the present invention will be described with reference to FIG. FIG. 7 is a diagram showing a configuration of an FH asynchronous receiver according to Embodiment 6 of the present invention.

Referring to FIG. 7, the sixth embodiment is such that a plurality of local oscillators 13f to 13h are frequency-converted by frequency converters 18a and 18b to obtain a multi-frequency local oscillation.

Although the sixth embodiment shows an example in which a local oscillation frequency corresponding to four hopping frequencies is obtained by three single oscillators, any number of hopping frequencies is possible.

Embodiment 7 FIG. Embodiment 7 of the present invention will be described with reference to FIG. FIG. 8 is a diagram showing a configuration of an asynchronous receiver for FH according to Embodiment 7 of the present invention.

In each of the above embodiments, an example having a plurality of local oscillation frequencies has been described. However, as shown in FIG. The effect of is obtained.

Embodiment 8 FIG. An eighth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a diagram showing a configuration of an FH asynchronous receiver according to Embodiment 8 of the present invention.

In a configuration using a plurality of intermediate frequencies, as shown in FIG.
, The number of demodulators 12 can be reduced to one.

[0051]

The asynchronous receiver for FH according to the present invention has the following features.
As described above, a receiving antenna to capture frequency hopping communication wave, a high frequency amplifier for amplifying a frequency hopping communication waves received, a plurality of oscillation frequency corresponding to <br/> transmission hopping frequency of the frequency hopping communication wave a local oscillator means for exiting <br/> force, said plurality of oscillation frequency of the input
And the frequency hot amplified by the high frequency amplifier.
A frequency converter for converting a ping communication wave into a plurality of intermediate frequencies corresponding to the plurality of oscillation frequencies, and passing an intermediate frequency of a predetermined frequency from the plurality of intermediate frequencies ,
An intermediate frequency filter for removing an unnecessary wave, the intermediate frequency
Since a demodulator for demodulating the intermediate frequency of the predetermined frequency that has passed through the filter, a plurality of transmission hopping circumference without knowing the frequency sequence and the change timing
Ru can receive FH communication wave consisting of wavenumber.

Further, in the FH asynchronous receiver according to the present invention, as described above, the local oscillating means includes a plurality of local oscillators for oscillating local frequencies corresponding to a plurality of transmission hopping frequencies. Since the local oscillator is connected in parallel to the frequency converter, there is an effect that the FH communication wave can be received without knowing the frequency sequence of the FH communication wave and its change timing.

In the FH asynchronous receiver according to the present invention, as described above, since the demodulator is an FM demodulator, the FH communication wave can be obtained without knowing the frequency sequence of the FH communication wave and its change timing. Is received.

In the FH asynchronous receiver according to the present invention, as described above, since the demodulator is an AM demodulator, the FH communication wave can be obtained without knowing the frequency sequence of the FH communication wave and its change timing. Is received.

Further, in the asynchronous receiver for FH according to the present invention, as described above, the local oscillation means is a harmonic oscillator which oscillates a plurality of frequencies at a constant frequency interval. There is an effect that the FH communication wave can be received without knowing the sequence and its change timing.

Further, as described above, the FH asynchronous receiver according to the present invention includes a filter for limiting a frequency between the frequency converter and the harmonic oscillator. It has the effect of being able to.

Further, in the FH asynchronous receiver according to the present invention, as described above, since the filter is a band-pass filter that passes only a predetermined frequency, it is possible to remove frequencies other than the intended frequency. .

Further, in the FH asynchronous receiver according to the present invention, as described above, since the filter is a band elimination filter for removing only a predetermined frequency, there is an effect that frequencies other than the intended frequency can be eliminated. .

Further, in the FH asynchronous receiver according to the present invention, as described above, the local oscillation means comprises a plurality of local oscillators and a plurality of second frequency converters,
Since local frequencies corresponding to a plurality of transmission hopping frequencies are oscillated, the FH communication wave can be received without knowing the frequency sequence of the FH communication wave and its change timing.

[0060] The FH for asynchronous receiver according to the present invention, as described above, a receiving antenna to capture frequency hopping communication wave, a high frequency amplifier for amplifying a frequency hopping communication waves received, a single oscillation frequency A local oscillator to be output, and the single oscillation frequency are input, and the high frequency
Frequency hopping communication wave amplified by a wave amplifier
A frequency converter for converting in frequency between a medium-out based on the oscillation frequency, transmission of the frequency hopping communication wave Hoppin
Transmission hopping frequency, which is provided for each
To remove the unnecessary waves other than it is passed through the intermediate frequency of the wave
Multiple intermediate frequency filters and these intermediate frequency filters
A plurality of demodulators for demodulating in response to the transmission hopping provided for each motor, since a combiner for combining the demodulated outputs of the plurality of demodulators, without knowing the frequency sequence and the change timing Multiple transmission hopping cycles
Ru can receive FH communication wave consisting of wavenumber.

[0061] The FH for asynchronous receiver according to the present invention, as described above, a receiving antenna to capture frequency hopping communication wave, a high frequency amplifier for amplifying a frequency hopping communication waves received, a single oscillation frequency A local oscillator to be output, and the single oscillation frequency are input, and the high frequency
Frequency hopping communication wave amplified by a wave amplifier
A frequency converter for converting in frequency between a medium-out based on the oscillation frequency, transmission of the frequency hopping communication wave Hoppin
Transmission hopping frequency, which is provided for each
A plurality of intermediate-frequency filter for removing unnecessary waves other than it is passed through the intermediate frequency of the wave number, the plurality of intermediate-frequency off
A combiner for combining the outputs of the filter, the synthesis output of the combiner
Since a force and a demodulator for demodulating in response to the transmission hopping, comprising a plurality of transmission hopping frequencies without knowing the frequency sequence and the change timing F
Ru can receive H communication waves.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an operation principle of the first embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a third embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a sixth embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a seventh embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of an eighth embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a conventional transmitter and receiver for FH communication.

FIG. 11 is a diagram showing a frequency sequence of a conventional FH communication and a change timing thereof.

[Explanation of symbols]

7 reception antenna, 8 high frequency amplifier, 10 frequency converter, 11 intermediate frequency filter, 12 demodulator (frequency discriminator), 13a, 13b, 13c, 13d, 13e local oscillator.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-191260 (JP, A) JP-A-9-83408 (JP, A) JP-A-7-131383 (JP, A) 88962 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) H04B 1/713

Claims (11)

(57) [Claims] And 1. A receiving antenna to capture frequency hopping communication waves, to force out the high-frequency amplifier for amplifying a frequency hopping communication waves received, a plurality of oscillation frequency corresponding to the transmission hopping frequencies of the frequency hopping communication wave Local oscillation means, and the plurality of oscillation frequencies are input to the high-frequency amplifier
The amplified frequency hopping communication wave is
Passing a frequency converter for converting the plurality of intermediate frequency corresponding to the oscillation frequency, an intermediate frequency of a predetermined frequency from said plurality of intermediate frequency
F which comprises an intermediate frequency filter for removing unnecessary unnecessary waves and a demodulator for demodulating the intermediate frequency of the predetermined frequency which has passed through the intermediate frequency filter.
Asynchronous receiver for H. 2. The local oscillating means comprises a plurality of local oscillators for oscillating local frequencies corresponding to a plurality of transmission hopping frequencies, wherein the plurality of local oscillators are connected in parallel to the frequency converter. Claim 1.
The asynchronous receiver for FH as described. 3. The FH asynchronous receiver according to claim 1, wherein the demodulator is an FM demodulator. 4. The FH asynchronous receiver according to claim 1, wherein the demodulator is an AM demodulator. 5. The FH asynchronous receiver according to claim 1, wherein said local oscillation means is a harmonic oscillator which oscillates a plurality of frequencies at regular frequency intervals. 6. The FH asynchronous receiver according to claim 5, wherein a filter for limiting a frequency is provided between the frequency converter and the harmonic oscillator. 7. The FH asynchronous receiver according to claim 6, wherein the filter is a band-pass filter that passes only a predetermined frequency. 8. The FH asynchronous receiver according to claim 6, wherein said filter is a band elimination filter for removing only a predetermined frequency. 9. The local oscillator according to claim 1, wherein said local oscillator comprises a plurality of local oscillators and a plurality of second frequency converters, and oscillates a local frequency corresponding to a plurality of transmission hopping frequencies. Asynchronous receiver for FH. A receiving antenna to capture 10. Frequency hopping communication wave, a high frequency amplifier for amplifying a frequency hopping communication waves received, a local oscillator for outputting a single oscillation frequency, said single oscillation frequency input And the high-frequency amplifier
Oscillating the amplified frequency hopping communication wave
A frequency converter for converting in frequency between a medium-out based on the frequency, each transmission hopping frequency of the frequency hopping communication wave
And the middle of each corresponding transmit hopping frequency
Among several types that pass frequencies and remove other unwanted waves
And between frequency filter, the transmission Hoppe provided for each of these intermediate frequency filter
A plurality of demodulators for demodulating in response to ring, asynchronous receiver for FH, characterized in that a combiner for combining the demodulated outputs of the plurality of demodulators. A receiving antenna for 11. capturing frequency hopping communication wave, a high frequency amplifier for amplifying a frequency hopping communication waves received, a local oscillator for outputting a single oscillation frequency, said single oscillation frequency input And the high-frequency amplifier
Oscillating the amplified frequency hopping communication wave
A frequency converter for converting in frequency between a medium-out based on the frequency, each transmission hopping frequency of the frequency hopping communication wave
And the middle of each corresponding transmit hopping frequency
A plurality of intermediate frequency filters for passing frequencies and removing other unnecessary waves, a synthesizer for synthesizing the outputs of the plurality of intermediate frequency filters, and a synthesized output of the synthesizer for demodulating in response to the transmission hopping An asynchronous receiver for FH, comprising: a demodulator.