JP3622895B2 - Spread spectrum communication equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spread spectrum communication apparatus.
[0002]
[Prior art]
FIG. 13 is a block diagram showing a conventional apparatus disclosed in, for example, Japanese Patent Application Laid-Open No. 2-309833.
In FIG. 13, 1 is a receiving antenna that receives a signal sent from a transmitter, 2 is a high-frequency amplifier that amplifies a received wave received by the receiving antenna 1 to a predetermined level, and 3 is a frequency from a hopping synthesizer 11 described later. Accordingly, a mixer 4 that hops the received wave from the receiving antenna 1 and despreads the frequency-hopped received wave, converts the output from the mixer 3 into an intermediate frequency of a constant frequency, and outputs the noise-removed output. The IF filter to be sent, 5 is an information reproducing unit for demodulating the reproduction data based on the output of the IF filter 4, 10 is a hopping pattern generator for generating a hopping pattern, 11 is a hopping pattern generated from the hopping pattern generator 10. A hopping synthesizer 12 that generates a different frequency depends on the output from the information reproducing unit 5. Bit synchronization circuit for synchronizing holding, high-speed clock generation circuit 13 for generating a high speed clock, 14 is a switch for switching control of the clock to the hopping pattern generator 10.
[0003]
Next, the operation will be described.
A signal transmitted from the transmitter is received by the reception antenna 1, amplified to a predetermined level by the high frequency amplifier 2, and despread by the mixer 3. The switch 14 fixes the hopping pattern generator 10 to the acquisition-dedicated channel until FH (frequency hopping) synchronization acquisition is possible, that is, after the hopping synchronization is established by connecting to the bit synchronization circuit 12. The high-speed clock generator 13 for generating a normal FH clock is switched. In the hopping synthesizer 11, FH can be captured by generating a frequency according to the pattern generated by the hopping pattern generator 10 and despreading by the mixer 3.
[0004]
[Problems to be solved by the invention]
Since the conventional spread spectrum communication apparatus is configured as described above, when capturing FH, there is a problem that it takes a long time from the detection of hopping synchronization until the actual start of hopping, and the capture time is long. there were.
[0005]
The present invention has been made to solve the above problems, and an object of the present invention is to obtain a spread spectrum communication apparatus capable of capturing FH at high speed.
[0006]
[Means for Solving the Problems]
The spread spectrum communication device according to the present invention performs despreading of a frequency-hopped received wave, and the despread received wave Capture In a spread spectrum communication apparatus that detects a pattern and acquires FH, a hopping pattern generator that generates a hopping pattern controlled based on a phase control signal, and a frequency according to the hopping pattern generated from the hopping pattern generator. A hopping synthesizer to be generated, a mixer that performs hopping according to the frequency from the hopping synthesizer and despreads the received wave that has been frequency hopped, and a synchronization frame pattern on the transmission side based on the output through the mixer Timing detection means for detecting, a clock generator for generating a clock, and a reception hop interval according to the hopping pattern based on the output of the clock generator Less than one hopping period of the hopping pattern, Of transmission hop interval 2 or more At intervals of several times As well as Until the sync frame pattern on the sending side is detected The above reception hop interval and Receive standby channel to the accuracy of the above clock generator In relation After the detection of the synchronization frame pattern on the transmission side, the phase control signal of the hopping pattern is set to the hopping pattern so that the reception hop interval and the reception standby channel are matched with the transmission side based on the output of the timing detection means. And a hopping phase control circuit for outputting to the generator.
[0007]
The timing detection means includes an information reproducing unit that demodulates reproduction data based on an output through the mixer, a bit synchronization circuit that synchronizes and holds the output through the mixer, the information reproducing unit, and the information reproducing unit. Data match determination that waits for a specified frame signal based on the output of the bit synchronization circuit, calculates the number of frame signal matches, and outputs a reset signal to the hopping pattern phase control circuit when the number exceeds the specified value And a section.
[0008]
In addition, a direct diffusion despreading circuit that performs despreading on the output of the mixer using a pseudo noise signal between the mixer and the information reproduction unit, and an output from the direct diffusion despreading circuit with a constant frequency An IF filter that converts the output to an intermediate frequency and sends out the noise-removed output; a digital matched filter that detects a peak of a pseudo-noise signal based on the output of the direct diffusion despreading circuit; and the direct diffusion despreading circuit A pseudo noise phase detection circuit that detects a phase shift in transmission / reception of a pseudo noise signal from the output of the pseudo noise signal, and controls a phase shift of the pseudo noise signal based on the outputs of the digital matched filter and the pseudo noise phase detection circuit, thereby A voltage-controlled oscillator that outputs a control signal that controls the noise phase, and a pseudo-noise signal that is controlled based on the output from this voltage-controlled oscillator It is characterized in that the serial with direct despreading circuit further direct spread pattern generator for outputting to.
[0009]
The timing detection means includes a detector that performs IF level detection based on an output through the mixer, an integrator that removes noise from the detection output of the detector, and an output from the integrator. And a level change detecting circuit that outputs a detection signal to the hopping pattern phase control circuit when only a noise is detected based on the level change.
[0010]
Further, the timing detection means performs a direct diffusion despreading circuit that despreads the output from the mixer using a pseudo noise signal, and detects a peak of the pseudo noise signal based on the output of the direct diffusion despreading circuit. A digital matched filter to be performed, a pseudo noise phase detection circuit for detecting a phase shift of transmission / reception of a pseudo noise signal from the output of the direct diffusion despreading circuit, and a pseudo matching based on outputs of the digital matched filter and the pseudo noise phase detection circuit. A voltage-controlled oscillator that controls a phase shift of a noise signal and outputs a control signal that controls a pseudo-noise phase of transmission and reception, and a pseudo-noise signal controlled based on an output from the voltage-controlled oscillator And a frequency hop for transmission based on the output change of the digital matched filter and the direct spreading pattern generator A signal to control the phase of the hopping pattern to detect the switching timing of the ring is characterized in that a correlation change detection circuit for outputting to the hopping pattern phase control circuit.
[0011]
In addition, the clock generator In reception standby Frequency hopping switching timing Advance or delay A clock is generated within one hop.
[0012]
Furthermore, the clock generator In reception standby Frequency hopping switching timing Advance or delay A clock having one hop or more is generated.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a block diagram showing a spread spectrum communication apparatus according to Embodiment 1 of the present invention.
In FIG. 1, the same parts as those of the conventional example shown in FIG. As a new code, 6 is reproduction data output from the information reproducing unit 5, 7 is a predetermined frame signal based on the outputs of the information reproducing unit 5 and the bit synchronization circuit 12, and calculates the number of coincidence of frame signals. The data match determination unit 8 outputs a reset signal to the hopping pattern phase control circuit when the number exceeds a specified value. Frequency hopping A high stability clock oscillator that generates a clock whose switching timing is within one hop, and 9 is a phase control output of the hopping pattern to the hopping pattern generator 10 based on the outputs of the data match determination unit 7 and the high stability clock oscillator 8. The hopping pattern phase control circuit to be sent out is shown here. Based on the level change of the output through the mixer 3 and the IF filter 4 by the information reproducing unit 5, the data coincidence determining unit 7 and the bit synchronization circuit 12. Timing detection means for outputting a signal for preventing phase shift by detecting the hopping timing is configured.
[0014]
Next, the operation will be described with reference to FIGS.
It is assumed that the high stability clock oscillator 8 generates a clock whose transmission / reception frequency switching timing is within one hop.
FIG. 2 shows transmission / reception frequency switching timing when the receiving side is delayed.
As shown in FIG. 2, the reception standby timing waits for a frequency with a period twice as long as the time timing held on the reception side. On the transmission side, the same synchronization frame signal is put in each hop. Then, at the timing of the transmission side time “4”, the time for one hop coincides with the transmission / reception. At this timing, synchronization can be detected by detecting the synchronization frame pattern on the transmission side at the reception side.
[0015]
The procedure will be described below.
The reception antenna 1 receives a signal sent from the transmission side. The hopping synthesizer 11 generates a frequency according to the hopping pattern generated by the hopping pattern generator 10 at the timing of the hopping sequence. The high frequency amplifier 2 amplifies the signal to a specified level, and the mixer 3 despreads the frequency-hopped received wave, converts it to an intermediate frequency of a constant frequency, and removes noise by the IF filter 4. The information reproducing unit 5 demodulates the reproduction data 6. The data coincidence determination unit 7 waits for a prescribed frame signal, calculates the number of coincidence of frame signals, and outputs a reset signal to the hopping pattern phase control circuit 9 when the number of pattern calculations exceeds a prescribed value.
[0016]
In this way, in FIG. 2, it is determined that the transmission of the frequency “4” is finished, and the hopping pattern phase control circuit 9 generates the frequency “5”, thereby continuously despreading the FH. And FH capture can be performed at high speed. In FIG. 2, the reception standby channel is changed to “1”, “4”, “5”, “6”,... Until the capture pattern is detected, and the capture pattern at time “4”. This shows the case where can be detected.
[0017]
FIG. 3 shows the transmission / reception frequency switching timing when the receiving side is advanced. As in FIG. 2, the FH synchronization frame pattern can be detected at time “1” on the transmission side, and FH can be captured at high speed. In FIG. 3, the reception standby channel is changed to “1”, “2”, “3”, “4”,... Until the capture pattern is detected, and the capture pattern can be detected at the time of “1”. Shows the case.
[0018]
As described above, according to the first embodiment, the hopping pattern phase control circuit 9 is provided, and the control waits at intervals several times the transmission hop interval, and FH acquisition is performed at high speed. Regardless of whether the timing is advanced or delayed, it is possible to detect the coincidence of frequencies and to perform FH acquisition at high speed.
[0019]
Embodiment 2. FIG.
Further, in the first embodiment, it is assumed that the high stability clock oscillator 8 is provided and the transmission / reception frequency switching timing is within one hop. However, as shown in FIG. 4, the high stability clock of the first embodiment is used. When the stability oscillator 15 having lower accuracy than the oscillator 8 is used, the transmission / reception switching timing may be one hop or more.
That is, according to the second embodiment, in such a case, as shown in FIG. 5, by waiting for a frequency with a period three times the time timing held on the receiving side, transmission / reception of 1 hop or more is possible. Even if the timing is shifted, FH can be captured at high speed. In FIG. 5, the reception standby channel is changed to “1”, “6”, “7”, “8”,... Until the capture pattern is detected, and the capture pattern is detected at time “6”. The case where it was possible is shown.
Further, as shown in FIG. 6, FH can be captured at high speed even when the timing on the receiving side has advanced by two or more hops. In FIG. 6, the reception standby channel is changed to “1”, “2”, “3”,... Until the capture pattern is detected, and the case where the capture pattern can be detected at the time “1”. Show.
[0020]
Embodiment 3 FIG.
Embodiment 1 described above shows an example in an FH radio, but as shown in FIG. 7, it can also be applied to a radio of DS (direct spreading) and one FH HYB (hybrid) system. An effect is obtained.
FIG. 7 is a block diagram showing a spread spectrum communication apparatus according to the third embodiment applied to a DS (direct spread) -one FH HYB radio.
In FIG. 7, the same parts as those of the first embodiment shown in FIG. As a new code, a DS (direct spreading) despreading circuit 16 is provided between the mixer 3 and the IF filter 4 and performs despreading on the output of the mixer 3 using a pseudo-noise signal. A pseudo noise (PN) phase detection circuit for detecting a phase shift in transmission / reception of a pseudo noise (PN) signal from the output of the diffusion despreading circuit 16, 19 is a peak detection of the pseudo noise signal based on the output of the direct diffusion despreading circuit 16. A DMF (Digital Matched Filter) 17 for controlling the phase shift of the pseudo noise signal based on the outputs of the digital matched filter 19 and the pseudo noise phase detection circuit 18, and a control signal for controlling the pseudo noise phase of transmission and reception A VCXO (voltage controlled oscillator) 20 for outputting a pseudo-noise signal controlled based on an output from the voltage controlled oscillator 17, the direct diffusion despreading circuit 1. Is a DS (Direct Sequence) pattern generator for outputting to.
[0021]
In the configuration shown in FIG. 7, the DS (direct diffusion) despreading circuit 16 performs despreading using the PN signal generated by the DS pattern generation circuit 20. A DMF (digital matched filter) 19 instantaneously detects the peak of the PN signal. The PN phase detection circuit 18 detects a phase shift in transmission / reception of the PN signal. The VCX0 (voltage controlled oscillator) 17 controls the phase shift of the PN signal and controls the PN phase of transmission / reception.
[0022]
Therefore, according to the third embodiment, the output subjected to the despreading by the direct diffusion despreading circuit 16 is given to the IF filter 4, and thereafter, the same operation as in the first embodiment is performed. , DS (direct diffusion) -FH HYB (hybrid) type radio can be applied, and the same effect as in the first embodiment can be obtained.
[0023]
Embodiment 4 FIG.
Although the third embodiment described above includes the high stability clock oscillator 8 and the frequency switching timing of transmission / reception is assumed to be within one hop, as in the second embodiment, as shown in FIG. When the stability oscillator 15 having a lower accuracy than the high stability clock oscillator 8 of the third embodiment is used, the transmission / reception switching timing may be one hop or more, and DS (direct spreading) one FH HYB (hybrid) The same effect as that of the second embodiment can be obtained even in the wireless system.
[0024]
Embodiment 5 FIG.
In Embodiment 1 described above, the transmission timing and the reception timing are detected by detecting a transmission frame pattern. However, as another method, the configuration shown in FIG. 9 can be adopted. .
FIG. 9 is a block diagram showing a spread spectrum communication apparatus according to the fifth embodiment.
In FIG. 9, the same parts as those of the first embodiment shown in FIG. As a new code, reference numeral 21 denotes a detector that performs IF level detection based on the output through the mixer 3 and the IF filter 4, reference numeral 22 denotes an integrator that removes noise from the detection output of the detector 21, and reference numeral 23 denotes an integrator. 22 is a level change detection circuit that outputs a detection signal to the hopping pattern phase control circuit 9 when a level change is detected based on the output from the output 22 and only noise is detected, and the detector 21, the integrator 22 and the above The level change detection circuit 23 constitutes timing detection means for outputting a signal for preventing phase shift by detecting the hopping timing.
[0025]
In FIG. 9, a detector 21 that performs IF level detection, an integrator 22 that removes noise from the detection output, and a level change detection circuit 23 are provided in place of the frame detector, and the frequencies match. When the level drops after continuing for one hop time (when only noise is detected), it is detected that the frequencies coincide with each other, the result is transmitted to the hopping pattern phase control circuit 9, and the phase of the hopping pattern generator 10 is detected. By controlling the above, the same effect as in the first embodiment can be obtained.
[0026]
Embodiment 6 FIG.
In the fifth embodiment described above, it is assumed that the high stability clock oscillator 8 is provided and the frequency switching timing of transmission / reception is within one hop. However, as in the second embodiment, as shown in FIG. When the stability oscillator 15 having lower accuracy than the high stability clock oscillator 8 of the fifth embodiment is used, the transmission / reception switching timing may be one hop or more. In such a case as well, the same as in the second embodiment. The effect is obtained.
[0027]
Embodiment 7 FIG.
In the third embodiment, as shown in FIG. 7, in order to perform FH acquisition, the IF filter 4, the information reproduction unit 5, the data match determination circuit 7, and the bit synchronization circuit 12 are provided. As a method for obtaining the effect, there is a method shown in FIG.
FIG. 11 is a block diagram showing a spread spectrum communication apparatus according to the seventh embodiment. In FIG. 11, the same parts as those of the third embodiment shown in FIG. As a new code, a correlation change detection 24 outputs a signal for controlling the phase of the hopping pattern to the hopping pattern phase control circuit 9 by detecting the transmission frequency hopping switching timing based on the output change of the digital matched filter 19. Circuit.
[0028]
That is, in the seventh embodiment, when the peak of the DS correlation can be detected, the timing at which the peak cannot be detected after the time of one hop continues is the transmission FH switching timing. By detecting the switching timing by the correlation change detection circuit 24 and transmitting it to the hopping pattern phase control circuit 9, and controlling the phase of the hopping pattern generation circuit 10, the same effect as in the third embodiment can be obtained.
[0029]
Embodiment 8 FIG.
In the seventh embodiment described above, it is assumed that the high stability clock oscillator 8 is provided and the frequency switching timing of transmission / reception is within one hop. However, as in the second embodiment, as shown in FIG. When the stability oscillator 15 having lower accuracy than the high stability clock oscillator 8 of the seventh embodiment is used, the transmission / reception switching timing may be one hop or more. In such a case as well, the same as in the second embodiment. The effect is obtained.
[0030]
【The invention's effect】
As described above, according to the present invention, the frequency-hopped received wave is despread, and the despread received wave Capture In a spread spectrum communication apparatus that detects a pattern and acquires FH, a hopping pattern generator that generates a hopping pattern controlled based on a phase control signal, and a frequency according to the hopping pattern generated from the hopping pattern generator. A hopping synthesizer to be generated, a mixer that performs hopping according to the frequency from the hopping synthesizer and despreads the received wave that has been frequency hopped, and a synchronization frame pattern on the transmission side based on the output through the mixer. Timing detection means for detecting, a clock generator for generating a clock, and a reception hop interval according to the hopping pattern based on the output of the clock generator Less than one hopping period of the hopping pattern, Of transmission hop interval 2 or more At intervals of several times As well as Until the sync frame pattern on the sending side is detected The above reception hop interval and Receive standby channel to the accuracy of the above clock generator In relation After the detection of the synchronization frame pattern on the transmission side, the phase control signal of the hopping pattern is set to the hopping pattern so that the reception hop interval and the reception standby channel are matched with the transmission side based on the output of the timing detection means. With a hopping phase control circuit that outputs to the generator So high There is an effect that FH can be captured quickly.
[0031]
The timing detection means includes an information reproducing unit that demodulates reproduction data based on an output through the mixer, a bit synchronization circuit that synchronizes and holds the output through the mixer, the information reproducing unit, and the information reproducing unit. Data match determination that waits for a specified frame signal based on the output of the bit synchronization circuit, calculates the number of frame signal matches, and outputs a reset signal to the hopping pattern phase control circuit when the number exceeds the specified value The hopping timing can be accurately detected.
[0032]
Further, between the mixer and the information reproduction unit, a direct diffusion despreading circuit that performs despreading on the output of the mixer using a pseudo-noise signal, and an output from the direct diffusion despreading circuit with a constant frequency An IF filter that converts the output to an intermediate frequency and sends out the noise-removed output; a digital matched filter that detects a peak of a pseudo-noise signal based on the output of the direct diffusion despreading circuit; and the direct diffusion despreading circuit A pseudo noise phase detection circuit that detects a phase shift in transmission / reception of a pseudo noise signal from the output of the pseudo noise signal, and controls a phase shift of the pseudo noise signal based on the outputs of the digital matched filter and the pseudo noise phase detection circuit, thereby A voltage-controlled oscillator that outputs a control signal that controls the noise phase, and a pseudo-noise signal that is controlled based on the output from this voltage-controlled oscillator By further comprising a direct-diffusion pattern generator that outputs to the direct-diffusion despreading circuit, it can also be applied to DS (direct diffusion) -FH HYB (hybrid) type radios and perform fast FH acquisition. There is an effect that can be.
[0033]
The timing detection means includes a detector that performs IF level detection based on the output through the mixer, an integrator that removes noise from the detection output of the detector, and an output from the integrator. Based on the level change detection circuit that outputs the detection signal to the hopping pattern phase control circuit when the level change is detected based on only noise, the hopping timing can be accurately detected.
[0034]
Further, the timing detection means performs a direct diffusion despreading circuit that despreads the output from the mixer using a pseudo noise signal, and detects a peak of the pseudo noise signal based on the output of the direct diffusion despreading circuit. A digital matched filter to be performed, a pseudo noise phase detection circuit for detecting a phase shift of transmission / reception of a pseudo noise signal from the output of the direct diffusion despreading circuit, and a pseudo matching based on outputs of the digital matched filter and the pseudo noise phase detection circuit. A voltage-controlled oscillator that controls a phase shift of a noise signal and outputs a control signal that controls a pseudo-noise phase of transmission and reception, and a pseudo-noise signal controlled based on an output from the voltage-controlled oscillator And a frequency hop for transmission based on the output change of the digital matched filter and the direct spreading pattern generator And a correlation change detection circuit that outputs a signal to control the phase of the hopping pattern by detecting the switching timing of the hopping pattern to the hopping pattern phase control circuit. Timing can be accurately detected.
[0035]
In addition, the clock generator In reception standby Frequency hopping switching timing Advance or delay By generating a clock within one hop, there is an effect that FH acquisition can be performed at high speed.
[0036]
Furthermore, the clock generator In reception standby Frequency hopping switching timing Advance or delay Generates a clock with 1 hop or more By When generating a clock whose transmission / reception frequency switching timing is 1 hop or more, Advance or delay in switching timing of frequency hopping in reception standby is 1 hop or more Even if there is a deviation, there is an effect that FH can be captured at high speed by waiting for the frequency at a cycle several times the time timing held on the receiving side.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating a spread spectrum communication apparatus according to a first embodiment of the present invention.
2 is an explanatory diagram illustrating time timing when reception timing is delayed in Embodiment 1. FIG.
FIG. 3 is an explanatory diagram illustrating time timing when reception timing is advanced in the first embodiment;
FIG. 4 is a block diagram showing a spread spectrum communication apparatus according to Embodiment 2 of the present invention.
FIG. 5 is an explanatory diagram showing time timing when the reception timing is delayed by one hop or more in the second embodiment.
FIG. 6 is an explanatory diagram showing time timing when the reception timing is advanced by one or more hops in the second embodiment.
FIG. 7 is a block diagram showing a spread spectrum communication apparatus according to Embodiment 3 of the present invention.
FIG. 8 is a block diagram showing a spread spectrum communication apparatus according to Embodiment 4 of the present invention.
FIG. 9 is a block diagram showing a spread spectrum communication apparatus according to Embodiment 5 of the present invention.
FIG. 10 is a block diagram showing a spread spectrum communication apparatus according to Embodiment 6 of the present invention.
FIG. 11 is a block diagram showing a spread spectrum communication apparatus according to Embodiment 7 of the present invention.
FIG. 12 is a block diagram showing a spread spectrum communication apparatus according to an eighth embodiment of the present invention.
FIG. 13 is a block diagram showing a conventional spread spectrum communication apparatus.
[Explanation of symbols]
1 receiving antenna, 2 high frequency amplifier, 3 mixer, 4 IF filter, 5 information recovery unit, 6 playback data, 7 data match determination unit, 8 high stability clock oscillator, 9 hopping pattern phase control circuit, 10 hopping soot pattern generation 11 data match judgment unit, 12 bit synchronization circuit, 13 high speed clock generator, 14 switch, 15 stability oscillator, 16 DS despreading circuit, 17 VCX0, 18 PN phase detection circuit, 19 DMF, 20 DS pattern generator ,
21 detector, 22 integrator, 23 level change detection circuit, 24 correlation change detection circuit.

Claims (7)

In a spread spectrum communication apparatus that performs despreading of a frequency-hopped received wave, detects a capture pattern of the despread received wave , and performs FH capture,
A hopping pattern generator for generating a controlled hopping pattern based on the phase control signal;
A hopping synthesizer that generates a frequency according to a hopping pattern generated from the hopping pattern generator;
A mixer that hops according to the frequency from the hopping synthesizer and despreads the received wave that has been frequency hopped;
Timing detection means for detecting the synchronization frame pattern on the transmission side based on the output through the mixer;
A clock generator for generating a clock;
Receiving hop intervals in accordance with the hopping pattern based on the output of the clock generator be less than 1 hopping period of the hopping patterns, as well as two or more integral multiple of the interval of the transmission hop interval, the sender Until the synchronization frame pattern is detected, the reception hop interval and the reception standby channel are changed in relation to the accuracy of the clock generator, and the detection of the synchronization frame pattern on the transmission side is based on the output of the timing detection means. A spread spectrum communication apparatus comprising: a hopping phase control circuit that outputs a phase control signal of a hopping pattern to the hopping pattern generator so as to match the reception hop interval and the reception standby channel to the transmission side. 2. The spread spectrum communication apparatus according to claim 1, wherein the timing detection means includes an information reproduction unit that demodulates reproduction data based on an output through the mixer, and bit synchronization that is synchronized and held by an output through the mixer. A hopping pattern phase control circuit that waits for a prescribed frame signal based on the output of the circuit, the information reproduction unit and the bit synchronization circuit, calculates the number of coincidence of the frame signal, and the number exceeds a prescribed value A spread spectrum communication apparatus comprising: a data coincidence determination unit that outputs a reset signal. 3. The spread spectrum communication apparatus according to claim 2, wherein a direct spread despreading circuit that despreads the output of the mixer by using a pseudo noise signal between the mixer and the information reproducing unit, and the direct spread despreading circuit. An IF filter that converts the output from the spreading circuit to an intermediate frequency of a constant frequency and sends out the noise-removed output, and that detects the peak of the pseudo noise signal based on the output of the direct spreading despreading circuit. A filter, a pseudo noise phase detection circuit for detecting a phase shift of transmission / reception of the pseudo noise signal from the output of the direct diffusion despreading circuit, and a pseudo noise signal based on outputs of the digital matched filter and the pseudo noise phase detection circuit. A voltage-controlled oscillator that controls the phase shift and outputs a control signal that controls the pseudo-noise phase of transmission and reception, and whether this voltage-controlled oscillator Spread spectrum communication system, wherein a pseudo noise signal is controlled based on the output further comprising a direct spread pattern generator for outputting to said direct spread despreading circuits. 2. The spread spectrum communication apparatus according to claim 1, wherein the timing detection means includes a detector for detecting an IF level based on an output through the mixer, and an integrator for removing noise in a detection output of the detector. And a level change detection circuit that outputs a detection signal to the hopping pattern phase control circuit when the level change is detected based on the output from the integrator and only the noise is detected. Spread communication equipment. 2. The spread spectrum communication apparatus according to claim 1, wherein the timing detection means includes a direct diffusion despreading circuit that despreads the output from the mixer using a pseudo noise signal, and an output of the direct spread despreading circuit. Based on a digital matched filter that detects a peak of a pseudo noise signal, a pseudo noise phase detection circuit that detects a phase shift of transmission / reception of a pseudo noise signal from an output of the direct diffusion despreading circuit, the digital matched filter, and the pseudo noise A voltage-controlled oscillator that controls the phase shift of the pseudo-noise signal based on the output of the phase detection circuit and outputs a control signal that controls the pseudo-noise phase of transmission / reception, and a pseudo-control controlled based on the output from the voltage-controlled oscillator A direct diffusion pattern generator for outputting a noise signal to the direct diffusion despreading circuit; A correlation change detection circuit for detecting a transmission frequency hopping switching timing based on a change in the output of the filter and outputting a signal for controlling a phase of the hopping pattern to the hopping pattern phase control circuit. Spread spectrum communication device. 6. The spread spectrum communication apparatus according to claim 1, wherein the clock generator generates a clock whose frequency hopping switching timing advance or delay in reception standby is within one hop. Spread spectrum communication device. 6. The spread spectrum communication apparatus according to claim 1, wherein the clock generator generates a clock whose advance or delay of frequency hopping switching timing in reception waiting is 1 hop or more. Spread spectrum communication device.

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