WO2007116890A1 - 符号発生装置 - Google Patents
符号発生装置 Download PDFInfo
- Publication number
- WO2007116890A1 WO2007116890A1 PCT/JP2007/057490 JP2007057490W WO2007116890A1 WO 2007116890 A1 WO2007116890 A1 WO 2007116890A1 JP 2007057490 W JP2007057490 W JP 2007057490W WO 2007116890 A1 WO2007116890 A1 WO 2007116890A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- code
- partial
- code string
- bit
- string
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
Definitions
- the present invention relates to a code generator used in a radar apparatus using a spread spectrum system, and more particularly to a code generator capable of generating a code at a high chip rate.
- a radar device (hereinafter referred to as an in-vehicle radar device) mounted on an automobile has been activated.
- a radar device using a direct sequence spread spectrum (hereinafter referred to as a DS-SS radar device) has been proposed.
- a DS-SS radar device uses a spread code on the transmission side to modulate (spread) a narrowband signal into a wideband signal, and then convert the wideband signal obtained by the modulation. Transmit as radar wave.
- the reflected wave obtained by reflecting the transmitted radar wave on the object is received as a received signal, and the received signal is demodulated to the original narrowband signal using a spreading code (despread) To do.
- the same spreading code as that used on the transmitting side when modulating the narrowband signal to the wideband signal is generated on the receiving side while shifting within the bit width of the code or less than the bit width.
- a correlation operation (despreading) is performed each time between the generated spreading code and the received signal.
- this displacement amount that is, the bit width of the spread code, determines the distance resolution in this radar apparatus.
- a code with a narrower bit width that is, a code with a higher chip rate, is a higher resolution radar device.
- the on-vehicle radar device is used for the purpose of improving safety such as collision avoidance, improving driving convenience typified by backward departure support, and improving ease of driving such as auto cruise. Both are used to detect obstacles behind the vehicle. For this purpose, it is necessary to suppress the influence of unnecessary radio waves such as interference caused by electromagnetic waves emitted from the same type of radar equipment mounted on vehicles other than the host vehicle.
- a spreading code used in DS-SS radar equipment a code with excellent cross-correlation characteristics that can avoid interference with radar waves of similar equipment power mounted on other vehicles, and A code with excellent autocorrelation characteristics that can avoid interference with radar waves transmitted from the vehicle is desired.
- the DS-SS radar system has a function that can be changed to an arbitrary spreading code when it receives interference from the radar equipment that uses the same spreading code installed in another vehicle.
- a pseudo noise code (hereinafter referred to as a PN code) having a common rule for both transmission and reception is used as a spreading code.
- Typical codes include M-sequence codes and Gold sequence codes.
- FIG. 1 and FIG. 2 are diagrams showing a configuration of a PN code generator in a conventional form.
- the PN code generator 12 includes a shift register 11 and an exclusive OR operation circuit (EX-OR) 13.
- the shift register 11 is an n-stage shift register.
- the logical value of the final stage of the shift register 11 and the logical value of the intermediate stage are exclusive-ORed by an exclusive OR operation circuit (EX-OR) 13, and a PN code is generated while being input to the first stage.
- EX-OR exclusive OR operation circuit
- the PN code generator 23 includes a flash memory 23b, a write controller 23c for writing a code to the flash memory 23b, and a read controller 23d for reading the code. And a microprocessor that outputs the sign of the specified address A unit (MPU) 23a is provided, and a code having an arbitrary delay amount can be generated by generating an arbitrary code and designating a read address (see, for example, Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 7-86984
- the chip rate for determining the clock frequency that is, the radar resolution
- the distance resolution of the radar is about 0.5 m, which is about 10 times the distance resolution required by the short-range radar device (about several centimeters). For this reason, there is a problem that it is difficult to realize a high-resolution radar device using a conventional code generator.
- an object of the present invention is to provide a code generation device that can generate a code at a high-speed chip rate using a conventional storage device. To do.
- a code generator includes: (a) (al) clock signal generating means for generating a clock signal at a first frequency; and (a2) the clock signal Accordingly, a timing signal generating unit that generates a timing signal at a second frequency lower than the first frequency, (a3) a storage unit that stores a plurality of code strings that are seeds of a pseudo-noise code; a4) a code string selection means for selecting a code string to be read from among a plurality of code strings stored in the storage means according to the timing signal; and (a5) a code selected by the code string selection means.
- a partial code string extraction means for extracting a code of a predetermined bit as a partial code string, and (a6) the partial code string extracted by the partial code string extraction means in accordance with the clock signal bit by bit Code output means for output That.
- the storage means when the size of the partial code string is X bits and the size of the code string is at least 2X-1 bits, the storage means outputs to the partial code string extraction means
- the bit width of the data bus on the receiving side may be at least 2X-1 bits.
- the storage means stores the code string Even if the storage area is at least 2X—one bit continuous space!
- the storage means is the code string selection means, X—1 bit data power of the selected code string X—sequentially stored in the X bit memory area that is continuous to the X bit of the currently selected code string!
- the partial code string extraction unit reads (el) a first code string part of the code string selected by the code string selection unit, and reads the first code string part from the first code string part.
- a first partial code string extraction unit for extracting a code of a predetermined bit;
- a second code string part is read out from the code string selected by the code string selection means, and the second code string is read out
- a second partial code string extraction unit for extracting a code of a predetermined bit from the part; and (e3) alternately selecting and selecting the first partial code string extraction unit and the second partial code string extraction unit.
- a partial code string selection unit that outputs a code corresponding to a predetermined number of bits extracted as a partial code string.
- the present invention is not limited to being implemented as a code generator, but controls a code generator.
- encoding is performed using a clock signal that is faster than a timing signal that controls the output of a storage device that stores a plurality of code strings that are seeds of a pseudo-noise code according to a predetermined rule. Can be output.
- a high-resolution radar device can be provided.
- FIG. 1 is a first diagram showing a configuration of a PN code generator in a conventional form according to the present invention.
- FIG. 2 is a second diagram showing a configuration of a PN code generator in a conventional form according to the present invention.
- FIG. 3 is a diagram showing a configuration of a spectral spread radar apparatus including the code generation apparatus according to the first embodiment of the present invention.
- FIG. 4 is a diagram showing a configuration of a code generation apparatus according to the first embodiment of the present invention.
- FIG. 5 is a diagram showing a detailed configuration of the code generation apparatus according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing an example of a code table stored in the code table storage unit according to the first embodiment of the present invention.
- FIG. 7 is a diagram showing a modification of the code table stored in the code table storage unit in the first embodiment according to the present invention.
- FIG. 8 shows the input / output of the partial code string extraction unit in the first embodiment according to the present invention.
- Fig. 9 is a diagram showing an outline in the case where the same code is repeatedly generated in the code generating apparatus according to the first embodiment of the present invention.
- FIG. 10 is a diagram showing an outline when a code delayed by 1 bit is generated in the code generation apparatus according to the first embodiment of the present invention.
- FIG. 11 is a diagram showing an outline in the case of generating a code delayed by 5 bits by the code generating apparatus according to the first embodiment of the present invention.
- FIG. 12 is a diagram showing a timing chart of the code generation apparatus according to the first embodiment of the present invention.
- FIG. 13 is a diagram showing a configuration of a code generation apparatus according to the second embodiment of the present invention.
- FIG. 14 is a diagram showing an outline in the case where the code generation apparatus according to the second embodiment of the present invention repeatedly generates the same code.
- FIG. 15 is a diagram showing an outline when a code delayed by 1 bit is generated in the code generation apparatus according to the second embodiment of the present invention.
- FIG. 16 is a diagram showing a configuration of a code generation apparatus according to the third embodiment of the present invention.
- FIG. 17 is a diagram showing a detailed configuration of the code generation apparatus according to the third embodiment of the present invention.
- FIG. 18 is a diagram showing a configuration of a spread spectrum radar apparatus including the code generation apparatus according to the fourth embodiment of the present invention.
- VCO Voltage controlled oscillator
- Embodiment 1 according to the present invention will be described below with reference to the drawings. [0026]
- the code generation device according to the present embodiment includes the following features (a) to (d).
- the storage function is a bit of the data bus on the side that is output to the partial code string extraction function.
- the width is at least 2X—1 bit.
- the storage function is that the storage area storing the code string is at least 2X-1 bits. It is a continuous space.
- the storage function is the X— 1-bit data power Stored in the X—1-bit storage area that continues to the X bit of the currently selected code string.
- FIG. 3 is a diagram illustrating a configuration of a spread spectrum radar apparatus including the code generation apparatus according to the present embodiment.
- spread spectrum radar apparatus 100 spread-modulates a narrowband signal into a wideband signal using a pseudo-noise code for transmission.
- a broadband signal obtained by spreading modulation is transmitted as a radar wave.
- the reflected wave obtained by reflecting the transmitted radar wave to the object is received as a received signal.
- the received signal is spread and demodulated into a correlation signal using a pseudo-noise code for reception. Based on the correlation signal obtained by spread demodulation, the presence / absence of an object, distance, and relative speed are calculated.
- spread spectrum radar apparatus 100 uses pseudo-noise code for transmission.
- a generator 101, a spread modulator 102, a signal source 103, a transmitting antenna 104, a receiving antenna 106, a receiving pseudo-noise code generating device 107, a spreading demodulator 108, a signal processing device 109 and the like are provided.
- the transmission pseudo-noise code generating apparatus 101 generates a transmission pseudo-noise code and supplies the generated transmission pseudo-noise code to the spread modulator 102.
- the transmission pseudo-noise code is a binary pseudo-noise code.
- the transmission pseudo-noise code is an M-sequence code that is well known as a pseudo-noise code.
- the spread modulator 102 performs spread spectrum modulation processing on the narrowband signal supplied from the signal source 103 using the transmission pseudo noise code supplied from the transmission pseudo noise code generator 101. Apply signal processing such as frequency conversion and amplification as necessary to convert it to a wideband signal.
- the signal source 103 generates a narrowband signal and supplies the generated narrowband signal to the spread modulator 102.
- Transmitting antenna 104 transmits a broadband signal obtained by conversion by spread modulator 102 as a radar wave.
- the receiving antenna 106 receives a reflected wave obtained by reflecting a radar wave on an object as a received signal.
- the reception pseudo-noise code generator 107 generates a reception pseudo-noise code and supplies the generated reception pseudo-noise code to the spread spectrum demodulator 108.
- the reception pseudo-noise code is a pseudo-noise code obtained by delaying the transmission pseudo-noise code.
- Spreading demodulator 108 performs processing such as low noise amplification and frequency conversion on the received signal received via receiving antenna 106 as necessary, and receives pseudo noise code generating apparatus 107. Is subjected to spread spectrum demodulation processing (correlation operation) using the reception pseudo-noise code supplied from, and converted into a correlation signal. The correlation signal obtained by the conversion is output to the signal processor 109.
- the signal processing device 109 is based on the delay time of the reception pseudo-noise code relative to the transmission pseudo-noise code, the narrowband signal generated by the signal source 103, the correlation signal output from the spread demodulator 108, and the like. Calculate the presence / absence of an object, distance, relative speed, and the like. It should be noted that reception pseudo-noise code generation apparatus 107 has the same configuration as transmission pseudo-noise code generation apparatus 101, and only transmission pseudo-noise code generation apparatus 101 will be described. Reception pseudo-noise code generation apparatus 107 Description of is omitted. Hereinafter, the pseudo noise code generator 101 for transmission is abbreviated as a code generator 101.
- FIG. 4 and FIG. 5 are diagrams showing the configuration of the code generator 101 in the present embodiment.
- the code generator 101 includes an address control unit 110, a code table storage unit 120, a timing control unit 130, a partial code string extraction unit 140, a parallel Z-serial conversion unit 150, a clock generation unit 160, and the like. Is provided.
- Address control section 110 selects a code string to be read from among a plurality of code strings stored in code table storage section 120 in accordance with the timing signal supplied from timing control section 130. To do. At this time, the address control unit 110 generates an address for identifying the code string to be read, and outputs the generated address to the code table storage unit 120.
- the code string is a code for the data bus width output in parallel from the code table storage unit 120.
- the address is individually assigned to a plurality of code strings stored in the code table storage unit 120, and is used for specifying a code string to be read from among the plurality of code strings. .
- the code table storage unit 120 stores a code table in which a plurality of code strings that are seeds of pseudo-noise codes are registered. Based on the address output from the address control unit 110, the code sequence to be read is specified from the stored code table (a plurality of code sequences). According to the timing signal supplied from the timing control unit 130, the identified code string to be read is output.
- the timing control unit 130 generates a timing signal at a second frequency lower than the first frequency in accordance with the clock signal supplied from the clock generation unit 160.
- the generated timing signal is supplied to the address control unit 110 and the code table storage unit 120. Note that the timing control unit 130 may generate the timing signal at the first frequency.
- Partial code string extraction section 140 extracts a code corresponding to a predetermined number of bits from the code string output from code table storage section 120, and outputs the extracted partial code string.
- the partial code string extraction unit 140 performs bit shift.
- a control circuit 141, a code selection circuit 142, and the like are provided.
- the bit shift control circuit 141 outputs a control signal for shifting the code string by a predetermined bit.
- the code selection circuit 142 shifts the code string in accordance with the control signal output from the bit shift control circuit 141.
- the code for a predetermined bit obtained by shifting is output as a partial code string.
- the parallel Z-serial converter 150 externally outputs the partial code sequence output from the partial code sequence extraction unit 140 one bit at a time according to the clock signal supplied from the clock generation unit 160. Output to.
- the parallel Z-serial converter 150 includes a latch 151, a shift register 152, a reset signal generation circuit 153, and the like.
- the latch 151 temporarily holds the partial code string output from the partial code string extraction unit 140, and temporarily holds it according to the clock signal supplied from the frequency divider 162 of the clock generation unit 160.
- the partial code sequence is output.
- the shift register 152 holds the partial code string output from the latch 151. According to the clock signal supplied from the clock generator 160, the held partial code string is output while being shifted by 1 bit. Further, the partial code string held in the shift register 152 is updated to the partial code string held in the latch 151 in accordance with the reset signal output from the reset signal generation circuit 153.
- the reset signal generation circuit 153 generates a reset signal at a predetermined period according to the clock signal supplied from the clock generation unit 160.
- the generated reset signal is output to the shift register 152.
- partial code string output from the partial code string extraction unit 140 may be directly input to the shift register 152 by adjusting the timing at which the code string is output by the timing control unit 130.
- the clock generation unit 160 generates a clock signal at the first frequency.
- the generated clock signal is supplied to the parallel Z-serial converter 150 to drive the parallel Z-serial converter 150.
- the clock generator 160 includes a voltage controlled oscillator (VCO) 161, a frequency divider 162, a phase comparator (PFD) 163, a loop filter (LPF). 164 etc. are provided.
- VCO voltage controlled oscillator
- PFD phase comparator
- LPF loop filter
- the code generator 101 uses an element in which the low-speed operation parts such as the address control unit 110, the code table storage unit 120, the timing control unit 130, the partial code string extraction unit 140, etc. are S-related materials. May be integrated.
- high-speed partial force such as parallel / serial converter 150 and clock generator 160, can be integrated using GaAs-based materials, InP-based materials, SiGe-based materials, GaN-based materials that can operate at high speed. You may have been. As a result, further improvement in performance can be expected, and mounting on the same board becomes easy, so that low cost can be realized.
- FIG. 6 is a diagram showing an example of a code table stored in code table storage section 120 in the present embodiment.
- the width of the data bus on the output side of the partial code string extraction unit 140 is 8 bits.
- An 8-bit partial code string is output from the partial code string extraction unit 140.
- the code table 170 is composed of records in which code strings are registered for each of the addresses R1 to R16.
- the code string is composed of the upper 8 bits basic part (CI to C8) and the lower 7 bits redundant part (C9 to C15)!
- the redundant part is the same as the code string for the upper 7 bits of the basic part (C1 to C8) of the next address.
- codes “1” to “15” are sequentially stored in C1 to C15.
- codes “9” to “23” are sequentially stored in Cl to C15.
- the width of the data bus on the output side of the partial code string extraction unit 140 is X (X is an integer of 1 or more). number. ) Bits, the code table storage unit 120 has a continuous storage area of at least 2X ⁇ 1 bits for each address. In each storage area, a 2X-1 bit code string is stored. Each code string consists of a basic part of upper X bits and a redundant part of lower X-1 bits. The redundant part is the same as the sign of the upper X—1 bit of the basic part of the next address
- the code may be stored continuously in the portion after 2X-1 bits. In this case, data different from the code may be stored. In other words, data other than the code may be stored in the upper and lower bits of 2X-1 bits. Also, here, it is assumed that the sign is stored in order from the most significant bit C1 to the least significant bit C15, and the sign is stored in order from the least significant bit C15 to the most significant bit C1. Also good. That is, the code “1” is stored in R1: C15, the code “2” is stored in R1: C14, and the code “15” is finally stored in R1: C1.
- a code with the order reversed such as “9”
- R2: C15 a code with the order reversed
- the code string is randomly stored in C1 to C15, and the output is performed after the calculation so that the code string input to the partial code string extraction unit 140 becomes a continuous code. As good as you can.
- each storage area instead of storing a single type of code string may be to store a plurality of types of code sequences (e.g., see FIG. 7.) 0
- each code sequence At least 2X—stored in a continuous storage area of 1 bit.
- FIG. 7 is a diagram showing a modification of the code table stored in the code table storage unit 120 in the present embodiment.
- the code table 180 is composed of records in which two types of code strings are stored for each of the addresses R1 to R16.
- one of the two types of code strings is referred to as a first code string part, and the other is referred to as a second code string part.
- the first code string part is composed of an upper 8-bit basic part (C1 to C8) and a lower 7-bit redundant part (C9 to C15).
- the redundant part (C9 to C15) is the same as the code string for the upper 7 bits of the basic part (C1 to C8) of the next address.
- the second code string is composed of the upper 8 bits of the basic part (C16 to C23) and the lower 7 bits of redundancy. Part (C24 ⁇ C30) and force are also composed.
- the redundant part (C24 to C30) is the same as the code string for the upper 7 bits of the basic part (C16 to C23) of the next address.
- FIG. 8 is a diagram showing input / output of the partial code string extraction unit 140 in the present embodiment.
- the address control unit 110 outputs to the code table storage unit 120 the address at which the code string to be read is specified.
- the code table storage unit 120 outputs a code string (C1 to C15) specified by the address.
- partial code string extraction section 140 shifts the code string (C1 to C15) output from code table storage section 120 by 5 bits.
- the 8-bit code (C6 to C13) from the most significant bit is output as a partial code string.
- the bit shift control circuit 141 outputs a control signal for shifting by 5 bits to the code selection circuit 142.
- the code selection circuit 142 shifts the code string output from the code table storage unit 120 by 5 bits according to the control signal output from the bit shift control circuit 141.
- the code table 180 shown in Fig. 7 is used instead of the code table 170, the code for 8 bits of another type of code string can be easily obtained by simply increasing the bit amount to be shifted. You can choose. As a result, the code pattern can be changed quickly at the time of interference.
- FIG. 9, FIG. 10, and FIG. 11 show the partial code string output from the partial code string extraction unit 140 and the code output in series one by one from the parallel Z-serial conversion unit 150 in the present embodiment. It is a figure which shows the outline
- the code string (R n: Cl to C15) for address Rn (n is an integer from 1 to 16) m is shifted from the most significant bit to m (m is an integer from 0 to 7).
- the code for the upper 8 bits starting from the selected bit is the partial code string (Rn: Cl + m to C8 + m).
- the partial code string extraction unit 140 converts the upper 8-bit codes to be read out of the code string (Rl: C1 to C15) output from the code table storage unit 120 into the partial code string (R1: C1 to C8). ) Is output.
- the parallel Z-serial conversion unit 150 outputs the partial code sequence (Rl: C1 to C8) output from the partial code sequence extraction unit 140 bit by bit. At this time, the code “1” to the code “8” are sequentially output one by one in order.
- the partial code string extraction unit 140 applies the same to the code string (R16: C1 to C15) output from the code table storage unit 120 to the code string (R16: C1 to C15). Execute the process.
- the parallel Z-serial conversion unit 150 performs the same processing from the partial code sequence (R2: C1 to C8) output from the partial code sequence extraction unit 140 to the partial code sequence (R16: C1 to C8). Execute the process.
- the parallel Z-serial conversion unit 150 sequentially outputs the code “121” to the code “127” with respect to the partial code string (R16: C1 to C8). Then, return to the first code and output the code "1". In this way, when using M-sequence codes, a 1-bit vacancy is created, so the codes are output with a shift of one. Therefore, next, the partial code string extraction unit 140 needs to output a partial code string (R1: C2 to C9) starting from the code “2”.
- the partial code string extraction unit 140 shifts the code for the upper 8 bits to be read out of the code string (Rl: C1 to C15) output from the code table storage unit 120 to the lower 1 bit. .
- the code for the upper 8 bits shifted 1 bit lower is output as a partial code string (Rl: C2 to C9).
- the parallel Z-serial conversion unit 150 outputs the partial code sequence (R1: C2 to C9) output from the partial code sequence extraction unit 140 bit by bit. At this time, the codes “2” to “9” are output in series one by one in order.
- the parallel Z-serial conversion unit 150 performs the same processing from the partial code sequence (R2: C2 to C9) output from the partial code sequence extraction unit 140 to the partial code sequence (R16: C2 to C9). Perform the process.
- the partial code string extraction unit 140 shifts the code for the upper 8 bits to be read from the code string (Rl: C1 to C15) output from the code table storage unit 120 to the lower 2 bits. To do.
- the code for the upper 8 bits shifted 2 bits lower is output as a partial code string (Rl: C3 to C10).
- the parallel Z-serial conversion unit 150 is replaced with the partial code string extraction unit 140.
- the partial code string (R1: C3 to C10) output from is output bit by bit. At this time, the code “3” to the code “10” are output in series one by one in order.
- the parallel Z-serial conversion unit 150 performs the same processing from the partial code sequence (R2: C3 to C10) output from the partial code sequence extraction unit 140 to the partial code sequence (R16: C3 to C10). Execute the process.
- the partial code string extraction unit 140 each time the partial code string extraction unit 140 executes a process on the code string at the addresses R1 to R16, the partial code string extraction unit 140 outputs the code string (Rn: Cl to C15) output from the code table storage unit 120. The upper 8 bits of the code to be read are shifted one bit at a time and output. Finally, the partial code string extraction unit 140 outputs the partial code string (R15: C8 to C15) from the partial code string (R1: C8 to C15) and outputs the first partial code string ( Return to R1: C1-C8).
- the partial code string extraction unit 140 performs the following process every time the code string of the addresses R1 to R16 is processed.
- the partial code string extraction unit 140 shifts the code for the upper 8 bits to be read out of the code string to the lower bit by bit, instead of the code string output from the code table storage unit 120 (Rn: C 1 to In C15), the upper 8 bits of the code to be read are output without shifting. In this way, a code delayed by 1 bit can be generated and used for correlation operation of the extra-spread spread method.
- the partial code string extraction unit 140 performs the following process every time the code string at the addresses R1 to R16 is processed.
- the partial code string extraction unit 140 converts the code of the upper 8 bits to be read from the code strings (Rn: Cl to C15) of the addresses R1 to R16 into the partial code string (Rn: Cl to C8). ) Is output.
- the partial code string extraction unit 140 shifts the code for the upper 8 bits to be read from the code string (R16: C1 to C15) of the address R16 to the lower 3 bits.
- the upper 8-bit code shifted to the lower 3 bits is output as a partial code string (R16: C4 to 11).
- a 5-bit delay is output.
- the code “1”, the code “124” to the code “127”, and the code “1” to the code “4” in the second period are output.
- the partial code string extraction unit 140 shifts the upper 8-bit code string (Rn: Cl to C15) to be read out of the code string at the addresses R1 to R16 downward by 4 bits.
- the code for the upper 8 bits shifted to the lower 4 bits is output as a partial code string (Rn: C5 to C12).
- the partial code string extraction unit 140 again converts the upper 8 bits of the read target code out of the code strings (Rn: Cl to C15) of the addresses R1 to R16 into the partial code string (Rn: Output as C1-C8).
- the codes “5” to “127” in the second period are output, the codes “1” to “5” corresponding to the 5-bit delay are output.
- the partial code string extraction unit 140 executes the process on the code string at the addresses R1 to R16, Shift bits down as appropriate.
- FIG. 12 is a diagram showing a timing chart of code generating apparatus 101 in the present embodiment.
- the clock generation unit 160 supplies the clock signal to the parallel Z series conversion unit 150, the timing control unit 130, and the like.
- the clock signal is a clock signal that drives the shift register 152 of the parallel Z-serial converter 150.
- the clock signal outputs the 8-bit partial code sequence output in parallel from the code table storage unit 120 via the partial code sequence extraction unit 140 one bit at a time, so that the state of the code table storage unit 120 is changed. It is necessary to operate at 8 times the frequency of the timing signal to be controlled.
- the code table storage unit 120 changes the address of the code string to be read during a clock signal for 8 clocks (hereinafter referred to as an address change operation).
- the code sequence specified by the changed address is output in accordance with the reading period of the latch 151 (hereinafter referred to as a code output operation).
- the address change operation and the code output operation are performed.
- the clock frequency is It can be seen that it is 8 times the frequency of the imming signal.
- the latch 151 updates the partial code string held in the latch 151 in accordance with the period of the code output operation of the code table storage unit 120 (hereinafter referred to as a read operation).
- the partial code string output to the shift register 152 is held in accordance with the address change operation period of the code table storage unit 120 (hereinafter referred to as a holding operation).
- reset signal generation circuit 153 outputs a reset signal to shift register 152 in accordance with the holding operation period of latch 151, and the partial code string held in shift register 152 Is changed to the partial code string held by latch 151.
- the shift register 152 holds the held partial code string in the latch 151. Updating to a partial code string (hereinafter referred to as data update operation) o When reset signal “0” is input from reset signal generation circuit 153, it is output while shifting the held partial code string. (Hereinafter referred to as a data shift operation.) O As shown in the code output, the codes are sequentially output in accordance with the clock signal, and the updated data is output during the data update operation.
- a code having a high chip rate can be generated. That is, the code stored in the code table storage unit 120 can be output only once for the 8-clock clock signal supplied from the clock generation unit 160. However, since an 8-bit code is input in parallel to the parallel Z-serial conversion unit 150, the parallel Z-serial conversion unit 150 outputs the partial code string one bit at a time, thereby achieving a high chip rate (timing signal). The code can be output 8 times faster).
- code generator 101 in the present embodiment a plurality of code strings are stored in code table storage unit 120, and the code strings are stored in accordance with a predetermined rule. And a pseudo-noise code having an arbitrary delay amount can be generated. For this reason, a code generator that greatly increases the degree of freedom of correlation operation with high interference resistance is provided. Can be provided. Also, for codes other than M-sequence codes, by using a code string in the same way, it is possible to reduce the address control operation and achieve high reading efficiency.
- code table storage unit 120 and the parallel Z-serial conversion unit 150 operating at a high-speed clock frequency code strings output in parallel from the code table storage unit 120 are serially connected one by one. Since codes can be output at high speed, a high-resolution spread spectrum radar apparatus can be provided.
- the clock signal controlled by the force timing control unit 130 directly input from the frequency divider 162 may be used as the operation clock of the latch 151.
- the clock generation unit 160 may be configured by only a stable voltage controlled oscillator (VCO) 161 and a frequency divider 162.
- the code string originally stored at the address R1 may be stored at the address R4 or the like.
- the code string may be stored randomly within the address stored in reverse order. In this case, it goes without saying that the operations required for address control and code ordering are necessary.
- data different from the code string and empty bits may exist before and after the code string or between different types of code strings.
- the second code string part may be stored at an address different from the address where the first code string part is stored.
- the plurality of code strings stored in the code table storage unit 120 may be stored at arbitrary addresses, and a code may be output by designating a desired address. However, in order to read efficiently, it is preferable to store a plurality of code strings like the code table storage unit 120 in the present embodiment.
- the code generation device has the characteristics shown in (e) below.
- the partial code string extraction function reads the first code string part of the code string selected by the (el) code string selection function, and the first code string partial force is a code corresponding to a predetermined bit.
- the first partial code string extraction function for extracting the code string, and (e2) the second code string part of the code string selected by the code string selection function is read, and a code for a predetermined bit is read from the second code string part.
- the second partial code string extraction function for extracting the first partial code string extraction function and (e3) the first partial code string extraction function and the second partial code string extraction function are alternately selected, and a predetermined bit extracted by the selected one is selected.
- a partial code sequence selection function for outputting the code of minutes as a partial code sequence.
- FIG. 13 is a diagram showing a configuration of the code generation apparatus according to the present embodiment.
- the code generator 201 differs from the code generator 101 in the first embodiment shown in FIG. 4 in the following points.
- the code generator 201 outputs two types of code sequences simultaneously from the code table storage unit 220, and alternately selects and outputs them from the partial code sequence selection unit 250.
- the At this time, partial code string selection section 250 outputs two types of partial code strings alternately at a frequency twice that of the timing signal.
- the code table 270 is stored in the code table storage unit 220. It is assumed that the code table 270 stores a 23-bit code string (C1 to C23) for each address R1 to R16. In the code table 270, the addresses R1 to R16 and bits C1 to C15 are set as the area 271. Addresses R1 to R16 and bits C9 to C23 are area 272. In other words, if the data bus width on the output side of the partial code string selector 250 is Y (Y is an integer equal to or greater than 1), each address of addresses R1 to R16 is composed of 3Y-1 bits of data. The Y bit is the basic part, and the upper Y + 1 and subsequent bits are the redundant part.
- the basic part corresponds to the upper Y bits and the redundant partial force SY + 1 to 2Y-1 bits.
- region 272 exists after the Y + 1 bit of the redundant part, the basic part is from the upper Y + 1 to 2 bits, and the redundant part is from 2Y + 1 to 3 bits—1 bit.
- 8 is adopted as ⁇ will be explained.
- the address control unit 210 selects bits C1 to C23 of the address R1.
- the partial code string extraction unit 240a includes the first partial code string (bits C1 to C15 of the address R1) among the code strings (bits C1 to C23 of the address R1) selected by the address control unit 210. ) And extract the 8-bit code from the first partial code string (bits C1 to C15 of address R1).
- the partial code string extraction unit 240b reads the second partial code string (bits C9 to C23 of the address R1) out of the code string (bits C1 to C23 of the address R1) selected by the address control unit 210.
- the second partial code string (bits C9 to C23 of address R1) also extracts a code for 8 bits. Then, the partial code string selection unit 250 alternately selects the partial code string extraction unit 240a and the partial code string extraction unit 240b, and outputs a code corresponding to a predetermined bit extracted by the selected one as a partial code string.
- the description of the partial code string extraction units 240a and 240b is omitted because they are the same as those of the partial code string extraction unit 140 in the first embodiment, except that the respective bit shift control circuits cooperate with each other. In cooperation, it may be tuned or untuned. Further, the shift amount may be the same or different.
- the partial code string extraction unit 240a includes a partial code in the first partial code string (bits C1 to C15 of the address R1). A sequence (bits C1 to C8 of address R1) is selected and output to partial code sequence selector 250. Also, the partial code string extraction unit 240b selects a partial code string (bits C9 to C16 of the address R1) from the second partial code string (bits C9 to C23 of the address R1) and selects the partial code string selection unit. Output to 250. The partial code string selection unit 250 then generates a partial code at the rising edge of the timing signal (time t).
- the sequence (bits C1 to C8 of address R1) is output to parallel Z-serial converter 150.
- the partial code string (bits C9 to C16 at address R1) is output to the parallel Z to serial converter 150.
- the partial code string extraction unit 240a includes the partial code string (address) of the code string (bits C1 to C15 of the address R1). R1 bit C 2 to C9) are selected and output to the partial code string selector 250. Also, the partial code string extraction unit 240b selects a partial code string (bits C10 to C17 of the address R1) from the code string (bits C9 to C23 of the address R1), and sends it to the partial code string selection unit 250. Output. The partial code string selection unit 250 then generates a partial code string (address R1) at the rising edge of the timing signal (time t).
- Bits C2 to C9) are output to parallel Z-serial converter 150.
- the partial code string (bits C10 to C17 at address R1) is converted into a parallel Z-serial converter 150.
- the address control unit 210 skips one address and selects bits Cl to C23 of the address R3.
- the partial code string extraction unit 240a, the partial code string extraction unit 240b, and the partial code string selection unit 250 perform the same processing.
- the code generator 201 can continue to supply the partial code string to the parallel Z-serial converter 150 without a break.
- the code generator 101 may not be able to catch up with the supply of the partial code string to the parallel Z-serial converter 150. This is because, if the amount of calculation of the code table storage unit 120, the partial code string extraction unit 140, etc. is large, these become low speed operations. On the other hand, the code generator 201 prepares continuous partial code strings and outputs them alternately. For this reason, the code table storage unit 220, the partial code string extraction unit 240a, the partial code string extraction unit 240b, and the like operate at half the frequency compared to the code table storage unit 120, the partial code string extraction unit 140, and the like. Can do.
- the partial code string selection unit 250 since the partial code string selection unit 250 only selects which one to output, it operates at a higher speed than the code table storage unit 220, the partial code string extraction unit 240a, the partial code string extraction unit 240b, and the like. Can do. As a result, the code generator 201 can continue to supply the partial code string to the parallel Z-serial conversion unit 150 without a break.
- the code generation device has the following characteristics (f).
- the code generator includes (fl) a code generation function for generating a pseudo-noise code, and (f2) a code retention function for retaining the code generated by the code generation function for 2X—1 bit.
- F3 At first, when a 2X-1 bit code is held by the code hold function, it is held by the code hold function. 2X—The 1-bit code is stored in the specified storage location of the storage function. From now on, when a new X-bit code is stored by the code storage function, it is newly stored by the code storage function and V 2X—A write control function that stores a 1-bit code in a new storage destination of the storage function.
- FIG. 16 is a diagram showing a configuration of the code generation apparatus according to the present embodiment.
- the code generation device 301 newly includes a clock signal supply unit 310, a write control unit 320, a code generation unit 330, and a code string holding unit 340.
- a clock signal is supplied from the clock signal supply unit 310 to each of the write control unit 320, the code generation unit 330, and the code string holding unit 340.
- FIG. 17 is a diagram showing a detailed configuration of the code generation device according to the present embodiment.
- the code generator 301 assumes that a control signal for generating a code that is a seed of a pseudo-noise code is also input to the write control unit 320 via an input terminal (not shown). To do.
- the clock signal supplied from the clock signal supply unit 310 the write control unit 320, the code generation unit 330, and the code string holding unit 340 operate as follows.
- the write control unit 320 causes the code generation unit 330 to generate a code.
- the code generation unit 330 generates a code using the shift register 331 and the exclusive OR operation circuit (EX—OR) 332 according to the clock signal supplied from the clock signal supply unit 310. Is output.
- EX—OR exclusive OR operation circuit
- a PN code generator using the shift register shown in FIG. 1 is shown as the code generation unit 330.
- the shift register 331 is a seven-stage shift register.
- the code string holding unit 340 converts the code output from the code generation unit 330 into a shift register 341 until the code string has a predetermined size. Hold temporarily. At this time, the code output from the code generation unit 330 is first held in the rightmost stage of the shift register 341. And according to the clock signal Each time a code is sequentially output from the code generator 330, the code is sequentially shifted to the left adjacent stage.
- the shift register 341 is a 15-stage shift register.
- the write control unit 320 writes the write signal And the write address are output to the code table storage unit 120.
- the code string having a predetermined size, which is held in the code string holding unit 340 is stored at the destination specified by the write address.
- the write control unit 320 waits for 15 codes to be held in the shift register 341 over 15 clocks. Then, when 15 codes are held in the shift register 341, the write signal and the write address are output to the code table storage unit 120. At this time, if address R1 is designated as the write address, the code string from code 1 to code 15 is stored in C1 to C15 of address R1.
- the write control unit 320 waits for 8 new codes to be held in the shift register 341 over 8 clocks.
- 8 new codes are held in the shift register 341, a write signal and a write address are output.
- address R2 is designated as the write address, code strings from code 9 to code 23 are stored in C1 to C15 of address R2.
- the write controller 320 writes the write signal and the write address when 8 new codes are held in the shift register 341 until the code string is stored in C1 to C15 of the address R16. And repeatedly outputting. This makes it easy to rewrite or add a code and reduce the cost when changing the code. In addition, the code can be rewritten or added while the code generator is mounted on the radar device.
- the content of the code table stored in the code table storage unit 120 may be changed, or another code may be registered in the code table. Further, an input terminal to which a code string is transferred from the outside may be provided. As a result, for example, by providing a circuit that communicates with an external device by wire or wireless at the end of the input terminal, it becomes easy to rewrite or add a code string and reduce the cost when changing the code. Can do. Furthermore, the code string can be rewritten or added while the code generator is mounted on the radar device. [0123] It should be noted that the code generator 301 is a programmable 'logic' device such as an FPGA (Field Programmable Gate Array) that can change the circuit configuration and change the tap position according to the specification requirements.
- FPGA Field Programmable Gate Array
- a plurality of code sequences that are seeds of the pseudo noise code may be added to the code table in the order described in the present embodiment, or a plurality of code tables may be added to the code table storage unit 120.
- the code table to be used may be switched according to circumstances.
- the spread spectrum radar apparatus has the same configuration as that of the code generation apparatus according to the first embodiment (g) (gl), and a pseudo-noise code for transmission that generates a pseudo-noise code for transmission.
- Generating function (g2) carrier wave generating function for generating carrier wave, (g3) data signal generating function for generating predetermined data force data signal, and (g4) data signal generating function for data signal generating function A modulation function that modulates the modulated signal using the carrier wave generated by the generation function, and (g5) a transmission pseudo-noise code generation function that generates the modulated signal obtained by the modulation function.
- a spread modulation function that spreads and modulates a wideband signal using a noise code (g6) a transmission function that transmits a broadband signal obtained by spread modulation using the spread modulation function as a radar wave; and (g7) implementation Code generator in Form 1 A reception pseudo-noise code generation function that generates a reception pseudo-noise code, and (g8) a reception function that receives a reflected wave obtained by reflecting a radar wave on an object as a reception signal; (G9) A spread demodulation function that spreads and demodulates the received signal received by the receive function into a correlation signal using the receive pseudo noise code generated by the receive pseudo noise code generation function, and (glO) spread demodulation Demodulation function that demodulates the correlation signal obtained by the spread demodulation using the function to the data signal using the carrier wave generated by the carrier wave generation function, and the data signal obtained by demodulation by the (gl l) demodulation function Signal processing function.
- the transmission pseudo-noise code generation device and the reception pseudo-noise code generation device of the spread spectrum radar apparatus in the present embodiment are the same as the code generation device 101 in the first embodiment. It is said that it is the structure of. However, the form of implementation Instead of being the same configuration as the code generator 101 in the state 1, it may be the same as the code generator 201 in the second embodiment, or the same as the code generator 301 in the third embodiment It may be configured as follows.
- FIG. 18 is a diagram showing a configuration of a spread spectrum radar apparatus provided with the code generation apparatus according to the present embodiment.
- spread spectrum radar apparatus 400 differs from spread spectrum radar apparatus 100 in the first embodiment shown in FIG. 3 in the following points.
- the spread spectrum radar apparatus 400 newly includes a carrier wave supply source 401, a modulator 402, a data signal supply source 403, and a demodulator 408.
- Carrier wave supply source 401 generates a carrier wave and supplies the generated carrier wave to modulator 402 and demodulator 408.
- the modulator 402 modulates the data signal supplied from the data signal supply source 403 using the carrier wave supplied from the carrier wave supply source 401.
- the modulated signal obtained by the modulation is output to the spread modulator 102.
- Data signal supply source 403 stores predetermined data, generates a data signal from the stored data, and supplies the generated data signal to modulator 402.
- Demodulator 408 demodulates the correlation signal output from spreading demodulator 108 using the carrier wave supplied from carrier wave supply source 401.
- the data signal obtained by demodulation is output to the signal processor 109.
- spread modulator 102 spreads the modulated signal output from modulator 402 using the transmission pseudo-noise code supplied from transmission pseudo-noise code generator 101. Modulate.
- Transmitting antenna 104 transmits, as a radar wave, a wideband signal obtained by performing spread modulation by spread modulator 102.
- the receiving antenna 106 receives a reflected wave obtained by reflecting a radar wave on an object as a received signal.
- Spreading demodulator 108 spreads and demodulates the received signal received by receiving antenna 106 using the receiving pseudo noise code supplied from receiving pseudo noise code generator 107.
- the correlation signal obtained by the spread demodulation is output to the demodulator 408.
- signal processing device 109 determines whether there is an obstacle. Calculate distance, relative speed, and send / receive data to / from the same type of radar equipment.
- the spread spectrum radar apparatus 400 may be used as a data communication apparatus instead of being used as a radar apparatus.
- the present invention uses the IJ as a code generator provided in a radar apparatus using a spread spectrum method, particularly as a code generator provided in a short-range radar apparatus that requires high resolution. be able to.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007541561A JP4994239B2 (ja) | 2006-04-04 | 2007-04-03 | 符号発生装置 |
US12/294,105 US7855677B2 (en) | 2006-04-04 | 2007-04-03 | Code generation apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006103430 | 2006-04-04 | ||
JP2006-103430 | 2006-04-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007116890A1 true WO2007116890A1 (ja) | 2007-10-18 |
Family
ID=38581180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/057490 WO2007116890A1 (ja) | 2006-04-04 | 2007-04-03 | 符号発生装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US7855677B2 (ja) |
JP (1) | JP4994239B2 (ja) |
WO (1) | WO2007116890A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010169530A (ja) * | 2009-01-22 | 2010-08-05 | Mitsui Eng & Shipbuild Co Ltd | 位置情報検出装置および位置情報検出方法 |
JP2011227632A (ja) * | 2010-04-17 | 2011-11-10 | Kanazawa Univ | 符号生成装置、通信装置、符号生成方法、及びプログラム |
Families Citing this family (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007103085A2 (en) * | 2006-03-01 | 2007-09-13 | Interdigital Technology Corporation | Method and apparatus for calibration and channel state feedback to support transmit beamforming in a mimo system |
KR100999260B1 (ko) * | 2008-08-22 | 2010-12-07 | 한국전자통신연구원 | Pn 코드 발생 장치 및 방법 |
US8629799B2 (en) | 2011-03-30 | 2014-01-14 | Sandia Research Corporation | Surface penetrating radar system and target zone investigation methodology |
US8462829B2 (en) | 2011-11-03 | 2013-06-11 | Sandia Research Corporation | System and method for communicating in a lossy environment |
JP5291267B1 (ja) * | 2011-11-09 | 2013-09-18 | パナソニック株式会社 | 周波数拡散型レーダ装置及びその制御方法 |
EP2960674B1 (en) * | 2013-02-19 | 2018-10-03 | Toyota Jidosha Kabushiki Kaisha | Radar and object detection method |
JP6375250B2 (ja) * | 2015-03-03 | 2018-08-15 | パナソニック株式会社 | レーダ装置 |
CN107046379B (zh) * | 2016-02-09 | 2020-07-10 | 松下知识产权经营株式会社 | 变换器、电力传输系统及控制器 |
US10261179B2 (en) | 2016-04-07 | 2019-04-16 | Uhnder, Inc. | Software defined automotive radar |
US9846228B2 (en) | 2016-04-07 | 2017-12-19 | Uhnder, Inc. | Software defined automotive radar systems |
WO2017175190A1 (en) | 2016-04-07 | 2017-10-12 | Uhnder, Inc. | Adaptive transmission and interference cancellation for mimo radar |
US9806914B1 (en) | 2016-04-25 | 2017-10-31 | Uhnder, Inc. | Successive signal interference mitigation |
US9791564B1 (en) | 2016-04-25 | 2017-10-17 | Uhnder, Inc. | Adaptive filtering for FMCW interference mitigation in PMCW radar systems |
US10573959B2 (en) | 2016-04-25 | 2020-02-25 | Uhnder, Inc. | Vehicle radar system using shaped antenna patterns |
US9599702B1 (en) | 2016-04-25 | 2017-03-21 | Uhnder, Inc. | On-demand multi-scan micro doppler for vehicle |
US9791551B1 (en) | 2016-04-25 | 2017-10-17 | Uhnder, Inc. | Vehicular radar system with self-interference cancellation |
WO2017187331A1 (en) | 2016-04-25 | 2017-11-02 | Uhnder, Inc. | Vehicle radar system with a shared radar and communication system |
US9772397B1 (en) | 2016-04-25 | 2017-09-26 | Uhnder, Inc. | PMCW-PMCW interference mitigation |
US9945935B2 (en) * | 2016-04-25 | 2018-04-17 | Uhnder, Inc. | Digital frequency modulated continuous wave radar using handcrafted constant envelope modulation |
US9753121B1 (en) | 2016-06-20 | 2017-09-05 | Uhnder, Inc. | Power control for improved near-far performance of radar systems |
WO2018051288A1 (en) | 2016-09-16 | 2018-03-22 | Uhnder, Inc. | Virtual radar configuration for 2d array |
US11454697B2 (en) | 2017-02-10 | 2022-09-27 | Uhnder, Inc. | Increasing performance of a receive pipeline of a radar with memory optimization |
WO2018146530A1 (en) | 2017-02-10 | 2018-08-16 | Uhnder, Inc. | Reduced complexity fft-based correlation for automotive radar |
US10670695B2 (en) | 2017-02-10 | 2020-06-02 | Uhnder, Inc. | Programmable code generation for radar sensing systems |
DE102017113567B3 (de) * | 2017-06-20 | 2018-08-30 | Infineon Technologies Ag | Schaltungsanordnung, sensorsystem, verfahren zum generieren einer spannung und verfahren zum betreiben eines sensorsystems |
KR102401188B1 (ko) * | 2017-08-28 | 2022-05-24 | 삼성전자주식회사 | 차량의 레이더를 이용한 오브젝트 검출 방법 및 장치 |
KR102397095B1 (ko) * | 2017-11-17 | 2022-05-12 | 삼성전자주식회사 | 차량의 레이더를 이용한 오브젝트 검출 방법 및 장치 |
US11105890B2 (en) | 2017-12-14 | 2021-08-31 | Uhnder, Inc. | Frequency modulated signal cancellation in variable power mode for radar applications |
US11265178B1 (en) | 2018-06-08 | 2022-03-01 | Southern Research Institute | Physically unclonable functions using pulse width chaotic maps |
WO2019237115A1 (en) | 2018-06-08 | 2019-12-12 | Cohen Seth D | Clockless time-to-digital converter |
US11474225B2 (en) | 2018-11-09 | 2022-10-18 | Uhnder, Inc. | Pulse digital mimo radar system |
WO2020183392A1 (en) | 2019-03-12 | 2020-09-17 | Uhnder, Inc. | Method and apparatus for mitigation of low frequency noise in radar systems |
CN109884607B (zh) * | 2019-03-21 | 2020-09-04 | 杭州电子科技大学 | 一种基于fpga的合成孔径地址码生成方法 |
CN110557129B (zh) * | 2019-09-12 | 2021-04-09 | 北京维普无限智能技术有限公司 | 一种多码制无线信号静噪方法 |
WO2021144711A2 (en) | 2020-01-13 | 2021-07-22 | Uhnder, Inc. | Method and system for intefrence management for digital radars |
US11733364B2 (en) * | 2020-05-21 | 2023-08-22 | Kratos Sre, Inc. | Target ranging with subsampled noise correlation |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07321611A (ja) * | 1994-05-20 | 1995-12-08 | Japan Radio Co Ltd | Pnコード発生回路 |
JP2001022636A (ja) * | 1999-07-08 | 2001-01-26 | Hitachi Kokusai Electric Inc | 記憶装置とそのデータ格納方法及び読み出し方法、拡散符号の生成装置 |
JP2001024624A (ja) * | 1999-07-12 | 2001-01-26 | Oki Electric Ind Co Ltd | 符号系列生成処理装置及び方法 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6313782B1 (en) * | 1960-11-16 | 2001-11-06 | The United States Of America As Represented By The Secretary Of The Army | Coded phase modulation communications system |
US4142189A (en) * | 1965-01-07 | 1979-02-27 | The Magnavox Company | Radar system |
US4078234A (en) * | 1975-04-25 | 1978-03-07 | The United States Of America As Represented By The Secretary Of The Army | Continuous wave correlation radar system |
GB2259820B (en) * | 1985-05-20 | 1993-08-25 | Gec Avionics | A noise radar |
US4759034A (en) * | 1986-12-02 | 1988-07-19 | General Research Of Electronics, Inc. | Multi-step spread spectrum communication apparatus |
US4977578A (en) * | 1988-02-19 | 1990-12-11 | Victor Company Of Japan, Ltd. | Spread spectrum communication system |
JPH069349B2 (ja) * | 1988-09-16 | 1994-02-02 | 日本ビクター株式会社 | スペクトル拡散通信方式 |
GB8904884D0 (en) * | 1989-03-03 | 1996-09-25 | Marconi Gec Ltd | Ranging systems |
JP2527104B2 (ja) * | 1990-01-22 | 1996-08-21 | 三菱電機株式会社 | 直交系列発生器および直交系列発生器を備えたレ―ダ装置 |
JPH0786984A (ja) | 1993-09-13 | 1995-03-31 | Kokusai Electric Co Ltd | スペクトル拡散通信における擬似雑音符号発生器 |
US5657021A (en) * | 1994-06-30 | 1997-08-12 | Ehsani Engineering Enterprises, Inc. | System and method for radar-vision for vehicles in traffic |
US5731781A (en) * | 1996-05-20 | 1998-03-24 | Delco Electronics Corp. | Continuous wave wideband precision ranging radar |
JPH1098358A (ja) * | 1996-09-24 | 1998-04-14 | Oki Electric Ind Co Ltd | 部分周期m系列発生回路 |
JP2800808B2 (ja) | 1996-11-13 | 1998-09-21 | 日本電気株式会社 | 拡散符号の位相シフト回路 |
CA2361015A1 (en) * | 2001-11-02 | 2003-05-02 | Spectrum Target Detection Inc. | Spread spectrum radar with leak compensation at baseband |
JP4850826B2 (ja) * | 2005-03-31 | 2012-01-11 | パナソニック株式会社 | スペクトル拡散型レーダ装置およびスペクトル拡散型探知方法 |
JP2007003305A (ja) * | 2005-06-22 | 2007-01-11 | Matsushita Electric Ind Co Ltd | スペクトル拡散型レーダ装置 |
US7460055B2 (en) * | 2006-06-02 | 2008-12-02 | Panasonic Corporation | Radar apparatus |
JP5121404B2 (ja) * | 2006-11-15 | 2013-01-16 | パナソニック株式会社 | スペクトル拡散型レーダ装置用半導体装置 |
-
2007
- 2007-04-03 WO PCT/JP2007/057490 patent/WO2007116890A1/ja active Application Filing
- 2007-04-03 US US12/294,105 patent/US7855677B2/en not_active Expired - Fee Related
- 2007-04-03 JP JP2007541561A patent/JP4994239B2/ja not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07321611A (ja) * | 1994-05-20 | 1995-12-08 | Japan Radio Co Ltd | Pnコード発生回路 |
JP2001022636A (ja) * | 1999-07-08 | 2001-01-26 | Hitachi Kokusai Electric Inc | 記憶装置とそのデータ格納方法及び読み出し方法、拡散符号の生成装置 |
JP2001024624A (ja) * | 1999-07-12 | 2001-01-26 | Oki Electric Ind Co Ltd | 符号系列生成処理装置及び方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010169530A (ja) * | 2009-01-22 | 2010-08-05 | Mitsui Eng & Shipbuild Co Ltd | 位置情報検出装置および位置情報検出方法 |
JP2011227632A (ja) * | 2010-04-17 | 2011-11-10 | Kanazawa Univ | 符号生成装置、通信装置、符号生成方法、及びプログラム |
Also Published As
Publication number | Publication date |
---|---|
JP4994239B2 (ja) | 2012-08-08 |
JPWO2007116890A1 (ja) | 2009-08-20 |
US20090135053A1 (en) | 2009-05-28 |
US7855677B2 (en) | 2010-12-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2007116890A1 (ja) | 符号発生装置 | |
JP2002297390A (ja) | 情報処理装置、センター装置及び端末装置並びにリモートプログラムダウンロードシステム | |
CN1628422A (zh) | 降低电磁干扰辐射的方法和系统 | |
CN115509968A (zh) | 存储器系统及存储器系统的控制方法 | |
US8462614B2 (en) | Buffer-based generation of OVSF code sequences | |
US6646579B2 (en) | Method and device for generating OVSF code words | |
JP2008020221A (ja) | スペクトラム拡散型レーダ装置及び擬似雑音符号生成器 | |
EP2827516A1 (en) | Scrambling code generation method, apparatus and scrambling code processing apparatus | |
CN101666870B (zh) | 提供用于多个物理通道的码的方法以及码存储器 | |
KR0175416B1 (ko) | 의사난수 잡음 발생 장치 및 방법 | |
KR200482293Y1 (ko) | 차량용 램프 발광 시스템 | |
US8467434B2 (en) | GNSS receiver and method for GNSS memory code generation | |
KR100569422B1 (ko) | IrDA 변복조 집적회로장치 | |
CN101666871B (zh) | 存储器码产生器以及存储器码产生的方法 | |
JPH088991A (ja) | データ転送装置 | |
JP2000252862A (ja) | 拡散符号発生回路および拡散符号発生方法 | |
CN104639206A (zh) | 同步装置及其同步方法 | |
JP2003527796A (ja) | ガロアlfsr用ゼロ遅延マスク | |
JP2007166354A (ja) | 送受信装置とそのパスサーチ回路 | |
EP1235376A1 (en) | Despreading method and despreading device | |
JP4029690B2 (ja) | 同期補足回路 | |
JP2571122B2 (ja) | マンチェスタm系列符号変調装置 | |
KR100542412B1 (ko) | 차세대네트워크 시험 장치의 다중 연결 시험 시나리오작성 방법 | |
JP4140689B2 (ja) | 周波数ホッピングを用いて送受信する方法および装置 | |
JP2006157503A (ja) | 受信装置、修正逆拡散符号生成装置、修正逆拡散符号生成方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2007541561 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07740926 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12294105 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 07740926 Country of ref document: EP Kind code of ref document: A1 |