JPH05500137A - Improvement of spread spectrum multiplex transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Improvement of spread spectrum multiplex transmission system Technical field The present invention generally relates to improvements in spread spectrum multiplex transmission systems; In a preferred embodiment, the present invention is applied to a vehicle location confirmation and tracking device. A large number of information-carrying channels are provided with appropriate pseudo-noise (PN)] code asynchronously and at a high speed relative to the data rate. Direct sequence modulation of the channel carrier allows for the same medium and nearly the same frequency. be shared while maintaining sufficient channel-to-channel isolation at the receiving end. Can be done. This has the effect of spreading the transmitted energy spectrum. .

At the receiver, the input composite stream is cross-correlated with the code associated with the desired channel. The information in each channel is extracted by Input sign and locally occurring sign When the clock rate and epoch match with the channel, the spectrum of the channel is The spreading energy is determined by the spread energy of the channel while the spectrum of other channels remains is decomposed into relatively narrow data bandwidths in terms of channels.

This method allows code-division multiple access [(code-division m separation is maintained on the receiving side by utiple access) (CD MA) Carrying a large number of channels in a particular medium (i.e., a coaxial transmission line) while maintaining It becomes possible to

The performance of this scheme in terms of signal-to-noise ratio depends on the relative orthogonality between the codes, i.e. It depends on the cross-correlation between codes.

The feature of this method is that it is different from conventional frequency-division access [frequency-division access]. sion mutfple access (F　D　M　A　)] system The signal-to-noise ratio increases gradually, without the abrupt loss of performance that occurs when channel capacity is exceeded. This is the reason why this system is adopted by many users. Ru.

Spread spectrum channel that eliminates interference from signals and noise in other channels This ability is called process gain. Mathematically, the process gain is B = Bandwidth of the varnish vector scattered signal, b = data or information bandwidth If the spectrum is continuous, the interval between the spectral lines of the PN code is expressed as It is assumed that the rate is small enough to be considered.

Here, if there is one transmitter and one receiver and no data exists, I will consider it. According to formula (1), the process gain is infinite because bo Becomes large. An example without this data is to check the location of the code epoch. Since the distance to the transmitter is known and the amount of propagation delay is known, it is not possible to calculate the distance to the transmitter. In other words, the code repetition period can be much larger than the data delay amount. We can list distance measuring devices that can eliminate uncertainty in distance by . In practice, the process gain can be very large, although not infinitely large, and the depends on the degree of coherence loss of the carrier to the receiver's local oscillator at the receiver. It is restricted. If the coherence time of receiver transmission is τ, then b is up to τ. process gain can only be achieved by further spreading the spectrum of the transmitted signal. can be increased. This is the electronic circuit or the spread spectrum PN code chips up to the limit set by the capability of the transmission medium to support the bandwidth. ・Increase chip-rate (code clock rate) made possible by

Referring to Figure 1, in the spread spectrum method location confirmation/tracking system, location confirmation Continuous direct sequence spread spectrum radio transmission from a vehicle 10 or target It can be seen that No. 11 is being fired. This transmission is properly spaced throughout the service area. The signal is received by a number of receiving stations 12 that are The difference in arrival time at the transmitter is measured. Here, the serial curve navigation technique is used to The position of the transmitter is calculated by the central computer 13 and this information is sent to the operator terminal. can be sent.

There are many reasons to use direct sequence spread spectrum modulation; One of these is to minimize multi-bus effects. Furthermore, location confirmation and tracking Since there is no need for data transmission for this purpose, the process gain can be very high. There is a possibility that it can be done. Unfortunately, the process gain is actually very strict. is limited to. First, transportation from automobiles moving in urban or suburban areas The signal suffers from Rayleigh scattering and Doppler frequency displacement. As a result, each receiving point 12 maximum Doppler for a car traveling at speed V and transmitting at frequency fo. Assuming that the displacement is Δf=f v/c (c is the radio wave speed of the radio wave), the received signal speed is The spectrum is band limited to within ±Δf of the center frequency. The carrier coherence time is large Depending roughly on the reciprocal of the width of the frequency modulation spectrum, this scattering causes the lower limit to be bl, that is, the post-correlation band. Second, different parts of the spectrum This is due to interference bandwidth limitations caused by different fading between It is not possible to arbitrarily widen the radio frequency spectrum bandwidth.

Approximate process gains achievable using urban automotive transmitters can be obtained from published data. Regarding the center frequency of approximately 450MHz Therefore, the minimum coherence time is about 5 ms and the coherence bandwidth is approximately IMHz, A process gain of approximately 37 dB is obtained. This number determines the wideband spectrum. Signal enhancement measures are provided to overcome continuous noise and disturbances.

A spread spectrum multi-vehicle location confirmation/tracking system in which multiple transmitters operate simultaneously. Then, each transmitter to be located and tracked is subject to (1) jammings. There are some elements. If CDMA is used, due to the cross-correlation of the desired signal and the unnecessary signal, This determines the degree of interference. Commonly used binary gold code In the Goldcode family, there is an n-bit shift instruction register. The cross-correlation between any set of codes produced using 1θ(r) l≦,, (n+1)/2 +1 (n is odd number) 1θ(r) l≦ 2"+1)/2-1 (n is an even number).

Since these sequences are the longest, the number of bits in the code is Since n>>1, the ratio of the autocorrelation peak value to the maximum cross-correlation value is , r~2 (n-1)/2 (r+ is an odd number) ~2 (n-2)/2 (n is an even number) becomes.

The thicker n is, the better the desired signal can be discriminated from unnecessary signals. Ru. In other words, the longer the sequence length (N), the better. However, T = code repetition period f = chip rate Assuming that, N=T f Re As we have already seen, for urban vehicle tracking systems, TR and f.

has a practical upper limit set by the coherence time and coherence bandwidth, respectively. Therefore, there is a practical upper limit on the choice of N. Regarding the specific case cited above Then, N is up to 5000. Assuming that N is this value, n is up to 12, Therefore, when R is up to 32, a process gain of about 15 dB can be obtained.

Clearly, in this case, CDMA has an achievable 37 dB process gain ( (for the disturbance continuum), it is several times shorter than the

The spectral components of the spread spectrum signal are spaced apart by f = 1/T = f/N. Understand that Rc It is important to put For a given chip rate, long PN codes are With spectral lines that are very close together, short PN codes have spectral lines that are widely separated. equip

Long codes can be modeled as having continuous electric flux vectors, but short codes The signal is unbalanced according to the number of spectral lines that fall into the passband of the post-correlation filter. Individual lines are especially sensitive to process gains that vary in successive steps. So, we have to consider individual lines.

The usefulness of a vehicle tracking or location confirmation system depends on the number of vehicles that can be located or tracked at the same time. It increases in proportion to the number. In such a spread spectrum multi-vehicle tracking system, , due to the need to isolate each received transmission from other transmissions, is highly Possible process gain is needed.

This necessity is explained by the ``near-far problem ++'' J. It is even more solicitous.

From the above discussion, in the frequency domain, the final spread spectrum signal is Discrete streams located on either side of the frequency and equally spaced from each other and from the carrier It is recognized that it consists of a multiplex of spectral lines.

The structure of a spread spectrum signal in the frequency domain consists of a large number of spread spectrum signals. The interleaved arrangement greatly increases the efficiency of use of the available frequency spectrum. This method uses frequency division multiplexing. This configuration is applicable to the present applicant who is currently applying +7) Described in PCT patent application PCT/AU87100020.

In the present invention, to achieve this isolation, we use a quasi-discrete array of the automotive transmitter spectrum. Utilizing the properties of improvements to new forms of Frequency Division Multiple Access (FDMA) There is.

Disclosure of invention The present invention consists of a spread spectrum transmission system, and in this spread spectrum transmission system, , one or more spread spectrum signals and other purposes. area is shared and these other purposes occupying the same frequency band are separated by a protected frequency band. are arranged in discrete channels much narrower than the spectral lines or bandwidth. Each spread spectrum signal has a wide information bandwidth and is Spectral lines or The band has a pseudo-noise code and a center or carrier frequency and a modulation frequency from which the band is selected. Each signal is created by modulating a carrier wave with a spread spectrum signal that It will be done.

In a preferred embodiment of the invention, a plurality of spread spectrum signals modulate the frequency of the carrier wave. Several bands are occupied and the center or carrier frequency of the spread spectrum signal is The spectral lines of the transmitted signals are interleaved with each other and with other channels of interest in the same band. separated by an increment selected to be placed.

The information bandwidth is significantly smaller than the spectral line or band spacing of the transmitted spectrum , applicable to all spread spectrum transmission systems. Diffuse space for distance measurement purposes In systems where the information bandwidth is basically O, such as systems using vector signals, the diffusion The usefulness of spectral systems is particularly increased.

In accordance with other aspects of the invention, a spread spectrum multiplexing system and a spread spectrum automatic A receiver for a vehicle tracking system is also provided.

Brief description of the drawing One embodiment of the invention will be described by way of example with reference to the following drawings.

Figure 1 shows a vehicle tracking system that could potentially use the spread spectrum multiplexing of the present invention. The system is shown schematically.

Figure 3 shows a spread spectrum signal that occupies the same frequency band as conventional wireless communication systems. Figure 2 graphically illustrates a frequency domain representation.

Figure 4 is a schematic diagram of a spread spectrum transmitter used in a vehicle tracking system using the present invention. It is a diagram.

Figure 5 shows the configuration of a remote point receiver used in a vehicle tracking system using the present invention. FIG.

FIG. 6 is a schematic diagram showing the configuration of the receiver of FIG. 5 in more detail.

Desirable conditions for carrying out inventions In the present invention, we utilize the quasi-discrete nature of the spectrum of automobile transmitters to achieve frequency division. A modified form of multiple access (FDMA) is used. PCT patent application, P CT/AU87100020 introduces a new form of FDMA as a spread spectrum signal. bandwidth savings can be achieved by interleaving spread spectrum signals. It is recognized that it can be achieved. Don't just interleave spread spectrum signals. and other communication channels, which tend to be spaced evenly across bands of spectrum. It is now recognized that even higher efficiencies can be achieved by interleaving Ru. An example of this is a large number of channels spaced substantially evenly across the band. Radio broadcasting and cellular telephones, which generally include multiple transmitters using It is a system. Appropriate center and modulation frequencies of one or more spread spectrum signals guard bands between channels of other communications signals by selecting these frequencies. in a frequency band already in use, occupied by It can also provide new uses without having detrimental effects on

To understand the principles involved, let us now refer to Figure 2. In Figure 2, the length N Transmission with direct sequence two-phase modulation of the carrier wave at the frequency of fo using the maximum PN code Details of the spectrum emanating from the aircraft are shown.

In this figure, the code repetition period frequency f = f /N is C The spectral lines are spaced apart and the spectrum of the transmitted signal is It has been shown to be symmetrical.

When this signal is emitted by a car in an urban area, the radio waves can be transmitted over multiple paths. As it propagates to the receiver, the signal undergoes Rayleigh scattering and Doppler frequency displacement . Each line in the spectrum of the received signal has a maximum Doppler frequency, with most of the line's energy Irregular frequency modulation appears within the bandwidth twice the displacement value (as described above). ). Specifically, if the speed of the car is V and the speed of radio wave propagation is C Then, the energy of the spectral line is basically expressed as Δf・f　ov　/c　 is included within the bandwidth 2Δf. For example, if fo is 450MHz and V = 100 km/h, it becomes 2Δf up to 85 Hz. reception In order to improve the signal-to-noise ratio of this signal by processing it onboard, the transmitter Direct sequence modulation of the final stage local oscillator with the same PN code used in and repeats this code until the epoch of the input code matches the epoch of this code. You can also adjust the local epoch. When you do this, all spectra of the received signal The energy contained in the torque line is 2f centered at the final intermediate frequency (IF). Fundamentally concentrated within the bandwidth.

In other words, this spectrum is decomposed or "respread" and the process In is achieved. From what has been said above, the final IF bandwidth is determined by this decomposition. must be wide enough to handle the energy of the spectrum is clear. If we allow an uncertainty of ±δf in the transmitter carrier frequency, the maximum The bandwidth of the final IF must not be narrower than 2(Δf+δf).

The spread spectrum signal radiated from each transmitter allows a relatively wide bandwidth B ( (typically about IM Hz) is occupied. Like in the case of multi-vehicle tracking systems. When the transmitters on the layer side operate simultaneously, in the use of FDMA, the system as a whole has at least A bandwidth of 3 irises would be required. Especially throughout urban areas, the radio frequency spectrum is considered a valuable resource in high demand. As a result, the bandwidth usage of lid x B is likely to be considered outrageous. In the present invention, the process related to CDMA is Acceptable answers to these objections without degrading the give.

In the present invention, the bandwidth of the signal received from each transmitter is very wide; has a quasi-discrete line spectrum arranged symmetrically around the carrier wave. I am using it. If the spacing between the "lines" is large compared to the frequency band each line occupies, and if the same spacing is used for all transmitters, this These “lines” (or bands) can now be interleaved with traditional communication channels. Ru. Some of these spread spectrum channels can be used to transmit spread spectrum signals to each other. during the guard bands between channels of a traditional communication channel by interleaving can be placed. This changes the center frequency of all transmitters by a relatively small amount. This is achieved by shifting the distance in the following manner.

In a typical conventional narrowband communication system, assuming that Fob<Fo8, the channel of F is band S with separation of center frequencies between channels. Discrete channels, each occupying a bandwidth Fob evenly spaced within the area I have been using le. The unoccupied area between channels or guard bands is FOb +Fgb=F, the width is Fg, and the error of the center frequency and S Adjacent channel interference caused by the filter's finite frequency response Serves the purpose of minimizing harm.

In a preferred embodiment of the invention, a single- or multi-channel spread spectrum system is implemented. It has been subjected. In this system, the frequency occupied by this spread spectrum system is Although the band is shared with traditional applications, the spectral lines of spread spectrum signals are within the guard band between the channels of the conventional system. Traditionally, this spread spectrum signal Interference with the radio system reduces the power in the spectral lines of a spread spectrum signal to the adjacent narrow By limiting the band to a level comparable to that allowed by the band channel, can be maintained within the specified range. This can be achieved using spread spectrum techniques. The process gain that allows for interference from conventional systems to this spread spectrum system It becomes possible to maintain harm within an acceptable range.

For a system consisting only of spread spectrum signal transmissions, let the number of simultaneous transmissions be set. cormorant. If p is an integer other than 0, it is a multiple of f　Rl)　/II　 If all transmitters have a center frequency shift and p and grave do not have a common factor, then , the i-th channel is It has a center frequency shift of .

This system has parameters F, F, and Fgb, and ob' as Suppose that it occupies the same frequency band as conventional radio systems. If the parameter is f -F, where i is Rcs Assuming that 1≦Q<violet and Qf/II×Fgb, i=1. 2. ,, ,,Q by choosing the center frequency appropriately. It is possible to keep the spectral lines of a spectral system within the guard band between adjacent channels of a conventional system. You can do something like that. In Figure 3, number 15 indicates the conventional communication system, and number 16 indicates the conventional communication system. The spectral lines of a spread spectrum signal are illustrated. Such a system Given the bandwidth requirements of narrowband communication channels, It can be seen that the number of cases is significantly smaller than that of Rei.

With this hybrid spectrum usage in mind, we expand equation (3) as follows: can do.

Let F be the selected spacing between the spectral “lines” of the above synthetic spread spectrum signal. 1 code repetition frequency F 1 CH L R Yanel occupied bandwidth is F. , and let the channel spacing of the conventional communication system be F. Good morning.

First, FII is F. If we select it as an integer multiple of 8 and let it be R, then R=FR/Fas (integer)...(4).

becomes. Typically R is a small value.

Choose such that R is an integer and R is a factor of father-in-law. Let the code repetition frequency be F, Assuming that there are practical limitations on FL, there must be no communication channel that shares the spectrum. Assuming that, M represents the maximum number of channels in the spread spectrum.

Now, assuming that the spectrum is available for traditional communication channels, Let Q be the maximum available number of spread spectrum channels to be placed as follows: Decide on the sea urchin.

05M-RF ob) R/F L - Fist (6) Formula (6) satisfies this formula This means that Q is chosen as the largest integer value that also has R as a factor. It is interpreted as

Finally, the frequency at the spread spectrum center frequency which allows the use of Q channels The formula for determining the numerical deviation can be written as follows. That is, this frequency Let f be the discrepancy in numbers, then f, = (i - 1) f Q + 1/31) CL c integer) --- (7) and i = 1.2. ,,Q /R; (1+M/R), (2+M/R),,,, (Q/R+M/R):, , [1+(R-1)ml/R; [2+(R -1) M/RE; , [Q/R+(R-1)M/R].

Low data rate telemetry, vehicle location, not for limitation but for illustration. A standard for deploying a multi-channel spread spectrum communication system used for visual confirmation. Consider a typical UHF land vehicle radio application. The basics of such a system The parameters are shown in Table 1.

1 table For purposes of illustration and not limitation, the parameters of one embodiment of the invention are as follows: Shown below.

spread spectrum transmission Nominal center frequency: (f) 470MHz automotive radio system Channel spacing (F) 25kllzS code repetition frequency and Automotive radio system Ratio to channel spacing (R)1 of the synthetic spread spectrum signal Selected “line” spacing: (f) for a 200Hz spread spectrum signal Maximum number two (III) 125 automotive radio system Occupied bandwidth: (F) 16kHz b achievable spread spectrum Number of channels: (Q) 45 Spread spectrum carrier frequency Frequency increment, (f R + f R/M) 25.21Hz pseudo noise code length: (N) 127 pseudo-polarized noise code Clock rate: (f) 3.175MHz The transmitter is shown schematically in FIG. Crystal controlled oscillator and divider 2 1, the clock for the pseudo-noise code generator 22 and the programmable division 24 and a phase comparator 25 to synchronize the voltage-controlled radio frequency generator 23. Standards are given. The output from the pseudo-noise code generator divides the RF carrier into two It is applied to a modulator 26 for phase modulation (with 0 or π). This modulated wave is transmitted to the output amplifier It is amplified in 27 and emitted from antenna 28.

A schematic diagram of the receiver electronics for a system of Q channels is shown in FIG. car shop In the preferred embodiment of the automatic presence verification system, the timing at all remote stations is fixed. It is synchronized to the receive timing signal emitted from the station. This timing transmission is A Yagi antenna connected to the radio frequency (RF) section 32 of the timing receiver. Preferably, it is received by a high gain antenna 31, such as a antenna. Taimin The Intermediate Frequency (IF) stage of both the timing reference and main receiver is The same clock in which the local clock is synchronized by control signals from the reference receiver 37 It is housed in a unit 33. This timing reference receiver 37 Additionally, the reference epoch signal 50 to Q's main receiver channel 34 connects this common unit. distributed and supplied through

The spread spectrum signal from the transmitter is transmitted to the vertical antenna array 35 and the main receiver R. received by the F unit 36 and maintained within the frequency deviation according to the above equation (7). is converted to an intermediate frequency. This is done in the IF stage mentioned above. Figure 6 shows which In this way, individual transmissions of Q are captured and their epochs are tracked. details are shown. Referring to this figure, all received spread spectrum signals It can be seen that the signal is amplified at the intermediate frequency F by the first stage broadband amplifier 41. child The amplifier has enough power to pass all the spread spectrum signals from the vehicle transmitter. Sufficient and wide bandwidth is provided. These amplified signals are divided equally and each nine identical mixers 4, each fed with a signal from a different local oscillator 43; handed over to 2. Local oscillator frequency, F, F.

...The frequency of Fq is expressed in formula (7) just like the carrier frequency of the transmitter. Therefore, they are shifted from each other.

As a result, receiver channel i with local oscillator frequency Fi is i = 1.2 , , ,Q, and let Fo be the center frequency of the signal received from transmitter 1. It is placed. The output of the first mixer is amplified in a second stage broadband amplifier 44. , the PN code generated in code generator 47 operates on this local oscillator boat. is applied to the second mixer 45. Although the same PN code is used, each channel The epochs in the channel are included in the detector and microcontroller block 46. depending on the epoch control signal generated by the microcontroller change rapidly. Each epoch matches the epoch of the input signal for that channel It will be adjusted until Once this is done, the spectrum of this signal is entirely F A relatively narrow band of frequencies with a center frequency at o (Doppler frequency as mentioned above) (determined by the displacement and the uncertainty of the transmitter crystal oscillator). This narrow The band signal appears at the output of the second mixer 45 and passes through the narrow band filter 49 to the detector. and passed to the microcontroller block 46. detector and micro This signal is detected and locally generated by controller block 46. The input code and the locally generated code are consistency between the blocks is maintained. There are many ways to achieve code epoch tracking This is well known to those skilled in the art and need not be discussed here.

Finally, the time difference between the epochs of the code in the tracking channel and the timing reference 50 is measured in the detector and microcontroller block 46 and for each channel The time measured for the local computer 38 and finally the modem 39 and via the land line 14 and the central computer 13 shown in Figure 1. passed on.

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Claims (41)

[Claims] 1. Multiple narrowband communication channels and spread spectrum channels separated from each other by guard bands A spread spectrum transmission system in which spectral signals share one frequency band. the narrowband communication channel by each of the spectral lines or bands of the spread spectrum transmitted signal; A center or carrier chosen to occupy one guard band of each isolating the channel. The carrier wave is simulated so that the spread spectrum signal has the transmission frequency and the modulation frequency. a plurality of spaced apart spectral lines or a spreading spectrum consisting of at least one transmitter for transmitting a signal having a bandwidth; vector transmission system. 2. of the spread spectrum signal along with a plurality of narrowband communication channels in the band. each of the transmitted signal spectral lines selected to interleave with each other and with each other. multiple spread spectrum signals with center or carrier frequencies spaced apart by increments of 2. The spread spectrum transmission system of claim 1 for transmitting. 3. The transmitted signal of each spread spectrum channel has an information bandwidth of substantially zero. 3. The spread spectrum transmission system according to claim 2. 4. Each spectral line or band of the spread spectrum signal is spaced apart by a frequency fR. , where K is an integer and M is a possible channel where the narrowband channel is not required. The center frequency of each signal is fR(K+1/ 3. The spread spectrum transmission system of claim 2, wherein the spread spectrum transmission system is spaced apart by M) frequency increments. 5. The bandwidth is occupied by all transmitted spread spectrum signals of the system and as a whole, the bandwidth is substantially larger than the bandwidth of the individual spread spectrum signals. frequencies that space the center frequencies of said respective spread spectrum signals so that 3. The spread spectrum transmission system of claim 2, wherein the spread spectrum transmission system has a number of increments. 6. The total bandwidth occupied by all transmitted spread spectrum signals of the system is so that it is not substantially larger than the bandwidth of the individual spread spectrum signal. 5. Spread spectrum transmission system according to claim 4, wherein K is selected. 7. K is selected to be 1, and the center frequency of each of the signals is the frequency ( 5. The spread spectrum transmission system of claim 4, wherein the spread spectrum transmission system is spaced apart by fR+fR/M). 8. 3. The spread spectrum transmission system according to claim 2, wherein each carrier wave has a uniform frequency. It consists of a band of frequencies for which there is a certain amount of uncertainty in the composite signal of all transmitted signals. The spacing between spectral lines or bands is the channel information bandwidth and the statistical uncertainty of the carrier. Approximately equal to the sum of the actual bandwidths, M may not include narrowband channels. Let fR be the maximum number of spread-spectrum channels to obtain, The frequency interval of the vector lines, fL, is the frequency between the spectral lines or bands of the composite signal. As an interval, the code length of the pseudo noise code and the code so that f=MfL. A spread spectrum transmission system where the clock rate is selected. 9. Occupied by multiple narrowband communication channels separated by guard bands a receiver for receiving a transmitted spread spectrum signal located in a frequency band , which is created by modulating the carrier wave with a pseudo-noise code. The spread spectrum signal consists of spaced apart spectral lines or bands of The carrier wave consists of a frequency band for which statistical uncertainty is expected, and the width of each guard band is is also narrow and transmits an information bandwidth that is significantly narrower than the spectral line or band of each guard band. spreading the respective guard bands that the communication signals have and isolating the narrowband communication channels; The center or is a receiver in which a carrier frequency and a modulation frequency are selected, A receiving apparatus for receiving a spread spectrum transmission channel and a correlating apparatus, the apparatus comprising: The transmission channel signal is transmitted through a narrowband filter having a bandwidth corresponding to the transmission channel signal bandwidth. By passing the spread spectrum received signal in the channel, the filter band Other spread spectrum and narrowband traffic within the frequency band along with broadband noise outside the Select the received spread spectrum signal by essentially removing all interference from the received channel. the channel information bandwidth and the statistical uncertainty bandwidth of the carrier, such that The channel spread spectrum is divided into a narrow bandwidth corresponding to the transmit channel signal bandwidth consisting of the sum of a correlation device provided in the transmit channel to decompose the vector received signal; and a receiver. 10. The receiving device is configured to receive simultaneously transmitted multiple spread spectrum signals. each spectrum of the transmitted signal along with a narrowband communication channel within the frequency band. centers or carriers spaced apart from each other by increments selected to interleave vector lines 10. The receiver of claim 9, wherein each of the signals has a frequency. 11. 11. The receiver of claim 10, wherein each channel has an information bandwidth of substantially zero. Shinki. 12. Each spectral line or band of said spread spectrum signal has a frequency fR. possible channels where K is an integer and M does not require narrowband channels. The center frequency of each signal is f(K+1/ 11. The receiver of claim 10, wherein the receivers are spaced apart by M) frequency increments. 13. The bandwidth occupied by all received signals of the system as a whole is each of the above in a manner that is not substantially larger than the bandwidth of the spread spectrum signal. The frequency increments spaced apart the center frequencies of the spread spectrum signal. 10. The receiver according to 10. 14. The bandwidth occupied by all received signals of the system as a whole is K is selected such that it is not substantially larger than the bandwidth of the spread spectrum signal. 13. The receiver according to claim 12. 15. K is chosen to be 1, and the center frequency of said signal is the frequency (fR+f 13. The receiver of claim 12, wherein the receivers are spaced apart by R/M). 16. 11. The receiver according to claim 10, wherein the spectrum of a composite signal of all received signals is The spacing between lines or bands is a function of the channel information bandwidth and the statistical uncertainty of the carrier. approximately equal to the sum of the bandwidth and fL between the spectral lines or bands of the composite signal. Let the frequency spacing, fR be the frequency spacing of the spectral lines of the individual spread spectrum signal, M is the maximum number of possible spread spectrum channels without narrowband channels. , the code length of the pseudo-noise code and the code of the code such that fR=MfL. 11. The receiver of claim 10, wherein a lock rate is selected. 17. A vehicle location confirmation/tracking system that includes: a) multiple spectral lines or bands; spread spectrum with a significantly narrower information bandwidth than the spectral line or band. an automotive radio transmitter mounted on a vehicle that transmits a Multiple frequencies occupied by narrowband communication channels separated from each other by bands The carrier wave is a pseudo-noise code and spread spectrum signal from the transmitter that occupies several bands. The spread spectrum signal is created by modulating the spectrum of the transmitted signal. center and modulation selected to place each line or band in its respective guard band an automotive radio transmitter, wherein the spread spectrum signal comprises a frequency; b) each known location to receive the spread spectrum signal transmitted from the transmitter; at least three receivers located at a point and corresponding to the transmit channel signal bandwidth. The received spread spectrum signal from the transmitter is passed through a narrowband filter with a bandwidth of by passing the signal along with broadband noise that is outside the filter bandwidth. Based on all interference from other spread spectrum and narrowband communication channels within several bands selectively removing the received spread spectrum signal from the transmitter. A spread spectrum signal is defined by the channel information bandwidth and the statistical uncertainty band of the carrier. In order to decompose into narrow bandwidths corresponding to the transmission channel signal bandwidth consisting of the sum of a correlation device included in the channel receiver; c) a control device in communication with each of the receivers, the controller controlling the transmission from the transmitter to each receiver; Calculate the position of each transmitter relative to the receiver by measuring the broadcast time. control device, including a signal processing device that calculates A vehicle location confirmation/tracking system consisting of. 18. 18. The vehicle tracking system according to claim 17, wherein a plurality of vehicles can be tracked simultaneously. each vehicle is equipped with one of the aforementioned vehicle radio transmitters to prevent narrowband overreliance. The spectral lines of the transmitted spread spectrum signal are interleaved with each other along with the channel. transmit at different center frequencies spaced apart from each other by selected frequency increments. the transmitter is configured such that the receiver is a multi-channel receiver; said control device is arranged to calculate the position of each vehicle carrying one Car tracking system. 19. Each spectral line or band of the transmitted spread spectrum signal has a frequency f spaced apart by R, where K is an integer and M is the maximum possible number of cars tracked simultaneously, 1 As a number larger than , the center frequency of each signal is around fR(K+1/M). 20. The vehicle tracking system of claim 18, wherein the vehicle tracking system is spaced apart by a wave number increment. 20. The band occupied by all the transmitted signals of the system as a whole is each of the above so as not to be substantially larger than the bandwidth of the spread spectrum signal. 19. The automatic transmitter of claim 18, wherein frequency increments are selected that space center frequencies of the signals. Vehicle tracking system. 21. The bandwidth occupied by all transmitted signals of the system is K is chosen so that it is not substantially larger than the bandwidth of the transmitted spread spectrum signal. 20. The vehicle tracking system according to claim 19. 22. K is selected to be 1, and the center of each transmitted spread spectrum signal 20. The vehicle tracking system of claim 19, wherein the frequencies are spaced apart by frequencies (fR+fR/M). Trace type. 23. 19. The vehicle tracking system of claim 18, wherein the uncertainty in the transmitted carrier frequency uncertainty due to motion and medium in the frequency received from the vehicle transmitter Each of the receiver transmit frequencies has a statistical uncertainty that is the sum of the The uncertainty in the carrier frequency and the sum of all the transmitted signals are calculated as follows: The spacing between the spectral lines or bands of the resulting signal is approximately equal, M is the number of channels, fR is the frequency spacing of the spectral lines of the individual spread spectrum signals, and fL is the composite signal. chosen as the frequency spacing between spectral lines or bands such that fR = MfL. The pseudo-noise code has a code length and a clock rate of the code. The automobile tracking system according to item 18. 24. A method of providing communication within a spectrum, comprising: transmitting a spread spectrum signal within the spectrum; The information is conveyed so that the signal has an information bandwidth that is significantly narrower than the frequency interval of the area. Multiple frequency-spaced spectra created by modulating a carrier wave line or band, the spread spectrum carrier and modulation frequency being Isolate the band communication channels and each one located within the same portion of the spectrum. to place the spectral lines of the spread spectrum signal within the guard band between channels. selected, the guard band being wider than the information bandwidth of the spread spectrum signal. Ori, All received signals of the signal are correlated to form the spread spectrum signal in the transmitted information signal band. The received signal of the transmitted signal is decomposed into narrow bands substantially corresponding to the bandwidth of the received signal. and pass the decomposed signal through a narrowband filter corresponding to the spread spectrum center frequency. to pass only the transmitted signal, and pass the wide signal outside the filter bandwidth. A communication method that eliminates band noise as well as interference from other received signals. 25. by multiple narrowband communication channels separated from each other by guard bands. A method of transmitting spread spectrum signals in a frequency band occupied by narrower than the width of each guard band to provide a spectrum line or band for each guard band. such that the signal has an information bandwidth significantly narrower than the frequency spacing of the line or band. Modulating the information carrier with a pseudo-noise code, the narrowband communication channel by each spectral line or band of the spread spectrum signal; the spread spectrum signal such that each one of the guard bands is occupied; Select carrier and modulation frequency A transmission method consisting of: 26. 5. The transmitted spread spectrum signal has an information bandwidth of substantially zero. Transmission method described in 25. 27. 26. The transmission method according to claim 25, comprising transmitting a plurality of spread spectrum signals. , The center or carrier frequency of each spread spectrum signal is determined by the spectrum of each transmitted signal. such as interleaving narrowband communication channels with other signals and with the narrowband communication channel. select a corner from the center frequency of an adjacent spread spectrum signal by A method of transmission further comprising steps. 28. Each spectral line or band of the transmitted spread spectrum signal is defined by a frequency fR. , where K is an integer and M is the maximum number of possible channels greater than 1. Then, the center frequencies of each signal are separated by a frequency increment of fR(K+1/M). selecting each spectral line or band of the transmitted spread spectrum signal to The transmission method according to claim 27, comprising: 29. Claim: each of said spread spectrum signals has an information bandwidth of substantially zero. Transmission method according to item 28. 30. The bandwidth occupied by all received signals of the system as a whole is each of the above in a manner that is not substantially larger than the bandwidth of the spread spectrum signal. 2. Further comprising spacing the center frequency increments of the spread spectrum signal of the spread spectrum signal. Transmission method described in 7. 31. The total bandwidth occupied by all transmitted spread spectrum signals of the system is so that it is not substantially larger than the bandwidth of the individual spread spectrum signal as , K is selected. 32. The center station wave numbers of the respective signals are spaced apart by a frequency (fR+fR/M). 29. The transmission of claim 28, further comprising selecting K to be 1, such that Method. 33. 28. The transmission method of claim 27, wherein statistical uncertainty in frequency is scheduled. Each carrier consists of a band of frequencies, the channel information bandwidth and the statistical imbalance of the carrier. Between the spectral lines or bands of the combined signal of all transmitted signals and the total bandwidth of certainty Each carrier wave is modulated so that the intervals of the channels are almost equal, and The maximum number, fR, is the frequency spacing of the spectral lines of the individual spread spectrum signal, fL is As the frequency interval between spectral lines or bands of the composite signal, fR=MfL. selecting the pseudo-noise code chosen and the clock rate of the code such that The method of transmission, further including. 34. A method of processing spread spectrum signals, which is used in spread spectrum communication systems. The network consists of multiple narrowband communication channel frequency bands separated from each other by guard bands. A spread spectrum signal occupies a frequency band that is otherwise occupied by a narrow band, and isolates the narrow band. from a plurality of spaced spectral lines or bands each located within the guard band. Each of the spread spectrum signals consists of The spread spectrum signal should be decomposed into narrow bands substantially corresponding to the transmitted signal bandwidth. The received spread spectrum and narrowband signals are then correlated with locally generated pseudo-noise codes. related, The decomposed signal is passed through a narrow band filter corresponding to each of the center frequencies. transmits only the transmitted information and rejects other information along with broadband noise outside the filter bandwidth. Spreading, consisting of eliminating interference from the received spread spectrum and narrowband signals of Spectral signal processing methods. 35. 35. The spread spectrum signal processing method according to claim 34, wherein the communication system comprises multiple It is a channel spread spectrum system, and each of a plurality of spread spectrum signals has a corresponding frequency. frequency-divided in-band, and the spectrum of the individual spread-spectrum channel signals is the front so that the spectral lines or bands are interleaved with each other and with the narrowband channel. A spread spectrum signal processing method, wherein each of a center and a modulation frequency are selected. 36. The information bandwidth of the signal is basically 0, and the information bandwidth of the respective channels is 36. The narrowband filter is further selected to pass only solution signals. Spread spectrum signal processing method. 37. Each spectral line or band of the transmitted spread spectrum signal is defined by a frequency fR. , where K is an integer and M is the maximum number of possible channels greater than 1. Then, the center frequencies of each signal are separated by a frequency increment of fR(K+1/M). selecting each spectral line or band of the transmitted spread spectrum signal to 36. The spread spectrum signal processing method according to claim 35, comprising: 38. The bandwidth occupied by all received signals of the system as a whole is each of said spread spectrum signals so as not to be substantially larger than the bandwidth of the signal. 36. The spread spectrum of claim 35, selecting increments that space center frequencies of the signal. Signal processing method. 39. The bandwidth occupied by all received signals of the system as a whole is Choose K such that it is not substantially larger than the bandwidth of the spread spectrum signal. 38. The spread spectrum signal processing method of claim 37, comprising: 40. The center frequencies of the spread spectrum signals are separated by a frequency (fR+fR/M). 38. The diffusion space of claim 37, further comprising selecting K to be 1, such that vector signal processing method. 41. The spacing between spectral lines or bands of the composite signal of all the received signals is Let M be the channel approximately equal to the sum of the channel information bandwidth and the carrier frequency uncertainty. Let the number of channels, fR be the frequency spacing of the spectral lines of the individual spread spectrum signal, fL is the frequency interval between the spectral lines or bands of the composite signal, and the pseudo noise mark is choose the code length of the code and the clock rate of the code such that R=MfL; 36. The spread spectrum signal processing method according to claim 35.