TWI241788B - A single pulse doppler processing method and device for the MC-DSSS radar systems - Google Patents

Abstract

The invention presents a single pulse Doppler processing method and device for the MC-DSSS radar system, which can programmable transmit a different modulation waveform (such as 16-QAM/64-QAM) for each sub carrier and different pulse compression gain (such as 21dB/22.8dB) in a different dwell time to improve radar's anti-jamming capability. The proposed single pulse Doppler processing device of the MC-DSSS radar, which combines the multi-carrier (MC) and direct sequence spread spectrum (DSSS) techniques, is based on the multi-carrier waveform characteristics. The coarse target Doppler frequency can be preliminary measured using FFT demodulator and correlator, which calculates the maximum correlation value between a demodulated multi-carrier amplitude spectrum of a single pulse echo signal and the transmit multi-carrier amplitude spectrum. Therefore, the required Doppler processing time for coarse target velocity estimation can be reduced. The constellation decoder using maximum likelihood (ML) rule combined with pulse compression processing is used to further fine estimate the target Doppler frequency. The MC-DSSS radar system using the proposed single pulse Doppler processing method and device can satisfy the requirements of high accuracy range and Doppler measurements.

Description

1241788 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a radar processing method and device for the capital city of the radar, in particular, a kind of preliminary estimation can be calculated by transmitting only secondary pulses Estimation) The target Doppler second rate, and then the maximum robust estimation method to estimate the target Doppler frequency wave directly sequence spread spectrum radar single pulse Doppler processing method and device. / [Previous technology] = Radar is a kind of microwave device. The __ day radar can be used to obtain the azimuth f information about the measured target. Radar is not only used for civilian use, such as navigation, meteorological detection, geodetic survey, industrial detection and traffic radar, or radar detection and positioning. Its purpose is to detect the vehicle's target moving speed and the distance between the target and the radar. In operation, the transmitter sends out a signal === which is reflected by the distant target, and is then confused by a recorded receiver. If a narrow-beam antenna is used, the position of the line of sight is accurately measured; the distance of the target is determined by the time taken by the radar to transmit the pulse wave == reflected back. The diameter of the target is related to the Doppler frequency. In summary, the conventional radar design method is as follows: 1., Tong, = Compression Radar makes __ leaf (DisereteF ", 7 = 1 head, and 11 11 uses the pulse wave to reduce the difference, to estimate the speed of the load, taste, and movement. Therefore, the traditional Ds needs to rely on the length of the pulse wave to be able to estimate the degree of object movement. 1241788 2 · Because the technology used is a single-carrier spread-spectrum modulation signal, the carrier frequency will not change with each transmission, so It is easier to increase the chance of ^ ^ 3, reducing the safety of the radar ^ When it is easy to be recognized by the enemy or interferes with the echo signal, when analyzing the detection rate of the target object, the Dingle f rate, 'use discrete riches The leaf (Discrete Fourier Transform, DFT) filter estimates the moving speed of the vehicle target based on the fixed pulse. The required processing time is relatively long. [Abstract] The main purpose of the present invention is to provide a multi-carrier direct sequence The development method and device of Pidubuhler only needs to transmit—Wei Bo :: Can calculate the change of Zengbu 'Preliminary estimation target Dubuuer frequency' can be ", the secondary purpose of the invention is to provide a multi-carrier Direct Sequence Spread Spectrum Thunder Early Wave Doppler The processing method and device are based on U-pulse compression processing of the maximum likelihood estimation method to perform a detailed step estimation of the target Doppler frequency, so that the radar produces a range of south accuracy and Doppler frequency measurement. Another purpose of the invention is to provide a single-pulse Doppler processing method and device for a multi-carrier direct-sequence spread-spectrum radar. The generated radar transmission waves use a modulation method of changing subcarriers to make it difficult for the enemy to detect The waveform emitted by the radar achieves the anti-interference performance of the radar system. ⑽ In order to achieve the above-mentioned purpose, the present invention discloses a single pulse wave method and device for a multi-carrier direct sequence spread spectrum radar, which is combined with a line wave (MUM wall). A MC) and Direct Sequence Spread Spectrum (〇 娜 ^), which can be personalized in each transmission (Dwelltime), set the orthogonal amplitude modulation of each subcarrier (Quadrature Amplitude Modulation) , QAM) and spread spectrum 1241788 ί gain, transmit _ wave, use the modulation of the changing subcarrier to fly the 发射 wave, which can improve the anti-interference of the system 1 Fast Fourier Transform , FFT) demodulator and related processing: The amplitude spectrum of the signal and the maximum phase of the transmitting multi-carrier carrier _ spectrum 值 f (initial estimation of the target Doppler frequency, shortening the initial estimation time of Doppler frequency ... and then use ΐ: ^ preliminary estimation ^ estimation rule nebula decoding processing combined with pulse_

= Rates are detailed and the fiber is H. [Embodiment] $ Enable your review committee to make further progress on the features, purposes, and functions of the present invention—step, understand, and understand. 'The following is the mathematical derivation of the present invention, and the process settings. In conjunction with the attached diagrams, the detailed description is as follows: Baixian, first explain the derivation of the ugly science of the present invention, please refer to FIG. 4, which is the target echo signal and radar emission signal system of the present invention. . Radar transmitter ^ pulse wave after spreading the money to reduce the money, then use the star money code, and then use the inverse fast < Liye transform (i_se Fast FGuriei > T_f_, liver coded signal modulation is transmitted on the subcarrier. Suppose this radar When receiving a single-point target signal, the waveform of the radar transmission signal can be expressed as: s ^ 〇 = ^ mc (〇eJ2 ^, 0 < t < T (1) where ④ is the amplitude of the actual transmitted signal, 乂 is the carrier signal u is The time width of the fundamental frequency signal, 1 (0 is the multi-carrier fundamental frequency QAM modulation signal. (2)

^ mc (t) = Wexp〇 ~ / ^) fi < t < T 8 1241788 △ / two 歹, 乂. is the sampling rate. Where # is the number of sub-carriers and the frequency interval between sub-carriers is _ signals of sub-carriers. In order for the transmitted signal to be real ^ 5 Slot to multi-carrier QAM signal must meet the following conditions: (3) ΐΐΐί Ξί ί ί # (_ Plex ewijugate) ° 16 · _ and 64_ cell direct sequence _ 4 of 4 ^. H6_QAM subcarrier signal transmission 128-bit, mother-64-QAM subcarrier signal transmission 256-bit set connection sequence code 刖 192 Reciprocal number in bits; M direct sequence code ^ °, 7; is the sampling rate 乂 / 1 c is the direct sequence chip code time. The right is based on the transmission domain time as the reference time point. The initial distance of 0 magic is private, and the target H, k, and the field violation ^ μ ^ The relative velocity of the radar (radial velocity) is v, the received signal and the transmitted signal "\ (/) ϋ remuneration (4) is: time-varying time delay 'its relationship with the target starting distance ⑽ to the radial velocity ν is (5) D (t) = 2 C + v: Substitute ⑹ ^ r (0 = G. where the angular frequency function is 1241788 Φ (ν) = ι ^^ ν_ C + v ⑺ and the time delay between the transmitted signal and the received echo signal is

C + V ⑻ Assuming that the time of the coherent receiver and transmitter is the same +, the received signal at the frequency can be expressed as ’and then down-converted by the mixer to the base (9) ㈣㈣ 赖 卿 _ 可 得 (10)

k = 〇XK, N where Λ is the Bühler frequency of the vehicle target, and the fast Fourier miscellaneous rate is the degree. The preliminary estimate of the city's capital city, Boller, can be generated by the maximum value of the original transmission amplitude and the correlation processing operation. / 〇 = and, A is the wavelength; Γ, = · Λ Φ (ν) △ / is (11) then the amplitude spectrum correlation function 4t) will be the maximum value of 5 at k A δ / kd (12), where u means taking Nearest integer. Therefore, the preliminary rough estimate (hereinafter referred to as the initial estimate) of the Doppler frequency is 1241788 (13) f0 = kd ¥ Π The initial estimate of the Doppler frequency After frequency compensation, it can be expressed as 2 '' ^ (0 = cxp (-J2nfcr ') iumc (/-r〇) exp (y2 ^ 〇? 〇 ^ ^ ^ () 4) where is the error value of the initial estimated Doppler frequency Because of coffee |, for every increase of ^, we perform detailed measurement of Doppler frequency (referred to as detailed estimation), where / is the number of times of detailed estimation of Doppler frequency. According to the above mathematical derivation, more developed The pulse pulse Doppler processing method and device are described in detail below. Please refer to Figure 1A. This figure shows the single pulse wave of the device and the device used as a column spread spectrum radar. 7: = Bu_Method 1 its system = ^ has a radar transmitting interface with a solution of Γ, the radar transmitting and receiving device can generate a single pulse transmission signal, which is detected by the single pulse The object is formed by reflection-a single pulse x-ray bluffs it has-the input end and an output end are early / and 7 ^ _ on the 7th tune Zhao 12 the radar surface reception has noise (Signai ::: ·· SNR) of the single-pulse imprinted skin signal, and will convert ::, to get the fundamental frequency received signal; the anti-mouth wave domain via-13 via the Weiren Miscellaneous, via -Production solution_produced-Doppler initially estimated that the conversion action of Hirota in step 12 was to output the single pulse two knowledge, and then convert it to digital frequency by analogy after conversion processing = Warp = present Bozhao is shown in Figure-B, where the solution step is 1241788 Steps: ⑶ Pass the 4 fundamental frequency reception ## through-fast Fourier transform

Fourier transform (FFT) to obtain the frequency spectrum of the fundamental frequency received signal; 132 The amplitude frequency spectrum of the noisy frequency received signal is subjected to a correlation ([〇㈣㈣ processing to obtain the Doppler initial estimated frequency. Screen storage = continued paste two A As shown, the figure is a flowchart of a multi-carrier direct sequence Buller processing method according to the present invention. The early pulse wave Doppler processing method 2 of the multi-carrier direct sequence spread spectrum radar includes a listing step: 21 provides with- The preliminary evaluation body and—the detailed evaluation body—the radar transmitting and receiving device, " The Haier radar transmitting and receiving device can generate a single pulse wave transmission signal, which is reflected when an object is detected to form a single pulse. The wave echo is signalled, and the initial evaluation body is connected with the fine evaluation body as a telecommunication. The Μ device receives a monopulse echo signal having a signal-to-noise ratio, and passes the early pulse echo signal through a conversion. A basic frequency received signal is received; 23 will be received by Wei Wei, the initial miscellaneous-deprecated initial estimated frequency, and the seat shall be 24, and the initial estimated frequency of the dubular shall be subjected to multiple detailed estimations through the detailed estimation body. Different, find a Doppler estimation frequency; step j The miscellaneous movement of 22 towels is to process the monopulse echo signal by a device and then convert it to a digital fine reception _ number by analogy. The sound is lost: as shown in Figure 2B. The tuning action is: more: 231 The baseband received signal is subjected to a Fast Fourier Transform (F ^ ier transform, FFT) to obtain the frequency spectrum of the baseband received signal; the baseband signal is reduced to pass through the lake (CGrrdati⑽ The process knows the initial estimated frequency of Dubler. &Quot; 12 232 1241788 Please indicate, this step 24 further includes the following steps: 242 Jiang Wu ^ takes an increase in frequency within the frequency range to form an adjusted frequency; Push ... "positive frequency, the initial estimated frequency of the Doppler, and the frequency is connected to the first compensation to form a compensation letter race; 24 \ = compensation signal f line-fast Fourier to her st F〇urier 244 to get-the base frequency after compensation Received signal spectrum; m-axis summary, depending on the conversion action of Gu Gulie to restore to form a coded signal; m ^ perform decoding in the code domain to form-decode the signal; despread the m-horse signal to obtain an output signal Power and feedback to force 241 at the same time, repeat the steps 241 to step 246; ^ Hai domain power is processed through a pulse wave shrinking gain to determine whether the signal power has the maximum output power; Second, if step 247 has the maximum output power, the distance is estimated; == 1 step 241 After processing, a compensation signal ⑽ will be generated. After step 2U46Hertz, the output signal power 602 ′ will be returned to step 241 through this step 243, 244, 245 and this step Hr]. So the loop operation should be This step 241 to step 246 is performed once, and the power of the 4th round of the i-rate output power due to the pulse compression gain is called the capital frequency, and the number of field evaluations is doubled (4 丄). The exact value of the Doppler frequency is (15) is (16) /, the average value of the number of times of the maximum power of the intermediate frequency spread spectrum output, T — I Star + I end mid ~ 2 13 1241788 If a single pulse Echo money contains additive white Gaussian noise (secret like whke

(Ga_nnolse, AWGN) 'and if the decision method of the nebula decoder is to use the maximum likelihood estimation rule (maximum like Hh00d mle), it is called the coding bit corresponding to the symbol coding position of the received signal at the star * figure j, as Nebula decoding ^ Output value. Based on the above mathematical scales and methods, this report is based on a comparative example, to confirm the above mathematical derivation and methods, please refer to Figure 3a, * Hey, multiple load divergence sequences Spread Spectrum Radar Doppler 2nd Place-Preferred Embodiment Single Pulse Doppler Frequency Processing Block Diagram The architecture shows that the 3 can receive a signal-to-noise ratio-monopulse echo Letter, main wave recording and cutting) It is formed by reflection of a single pulse wave when the signal hits the object. The processing device 3 includes-a frequency reduction processing section, a frequency preliminary estimation section 32, and a compensation section 33. And a frequency estimation unit% is to reduce the frequency of the single-pulse echo signal to a fundamental frequency receiving signal, and to compensate to form a compensation signal. The frequency details, /, can be used to compensate the signal ~ (0 for multiple feedback operations to find a fine Π 丁丁 Among them, the frequency reduction processing section 31 has a mixer 311, a type of digital conversion 312 in order, and the preliminary evaluation section 32 has a fast-t, howling silk wave device such as And the second conversion benefit 312 is electrically connected, the analog / digital converter 312 Han Fourier conversion demodulator 321 is electrically connected, and the fast Fourier transform is connected to the relevant processor 322. Connected. When the processed wave echo signal hits the down-frequency place of the mixer 311, the receiver receives ^^ (〇 and converted to 1241788 by the analog / digital converter 312 and then red by the 4 correlation processor 322 , The maximum correlation value between g aij _ and the emission spectrum is equal to the tiger 1), and the first estimated Doppler is subjected to a correlation operation to obtain the compensation unit 33, which can receive the digital fundamental frequency and receive the echo. The mission will estimate the target distance by performing multiple estimations of the frequency by the frequency estimation unit 34. The frequency sequence 342, has a fast Fourier transform processor 34, and is parallel-to-serial. 342, a nebula decoder 343, a revolution and a maximum power Interrupter and frequency adjuster 346, which changes processing cry 341, rice, green * Cheng Tengmi fast Fourier transfer to the star; 344 for electrical tender identification and frequency ^ 3 compensation section 33 for electrical connection. Among them, the Lai Fast Fu The place where 解调 341 is demodulated is loaded with ^ ^ domain, and then passes through the parallel-to-serial 342 ^ despreader 344 to obtain the -power signal "and 1 2 3 0 through the maximum power judgment and frequency adjuster MS at —Frequency range! Go to the parent to take the frequency-increase the amount of $ to form the adjusted frequency and feedback to the compensation unit 15 1 2 Every time the feedback operation is performed-times, a signal signal will be generated, so the weight is 2 7 *, look for the range of the number of times the power is shifted (/ τ to produce the maximum output power of 6G1, the frequency of the Buller frequency is estimated 3, and Γ HAI can be calculated according to equations (15) and (16). The Doppler frequency is estimated and the distance is estimated by the distance estimator 345. 1241788 Please refer to solution 3A, ^ DSSS radar transmitter and receiver rack invented by Lang Xilin. The radar_4 ^ system package: Γ twenty-one recorded processing body 42. The emitter 41 includes a spread-spectrum coding unit 412 and a modulation transmitting unit 413. The display sequence further includes a spreader 412 and a nebula encoder 4122. The week receiving unit 413 sequentially changes It has a tandem-to-parallel cent, an inverse fast Fourier transform point 2、4132, a number of _transformed cents, and a mixer 4134. The signal processing body 42 has a frequency-reduction processing unit-like structure, a fresh-line processing unit = 422, a compensation unit 42, and a frequency fine estimation unit. The frequency-reduction processing unit is similar to the following: the frequency converter has a -mixer 4211 and an analog / digital converter. The frequency = estimation unit 422 has a fast Fourier transform demodulator and a correlation processor. 4222, the frequency detail estimation section 424 has a system, a parallel-to-serial conversion 4242, a nebula decoding, please 3, a 424 ^ and-signal demodulation. The radar button 4 has a digital k-number processing controller 43 and a radar controller 44. The emitter can generate a pulse wave signal. After the spreader 4121 generates a straight sequence spread spectrum signal, the nebula encoder 4122 is used to perform nebula coding and tandem / t-column, 彳 ί 4131, and then use # 点 反反 Fourier The converter 4132 is a single-pulse time-domain signal that modulates QAM # on each subcarrier. The digital / analog conversion mixer 4134 raises the frequency, and a single-pulse signal St (t) is transmitted by the antenna. Launch out. Although the early pulse wave transmission signal _ is reflected when the target object is detected, a single ^ echo wave signal is formed, and after it is received by the signal processing body 42, it is down-converted to the willow and analog / digital conversion through the mixed wave benefit 4211. The Gamma signal is converted into a digital Y fundamental frequency signal, which is fed into the Doppler frequency preliminary estimation unit 422 and the compensation unit 423, and then the FFT demodulates each subcarrier QAM signal of f 4241, and performs parallel / serial conversion 4242 and nebula decoding °° The despreading is performed by the despreading device 4244. Since the signal processing body 42-1241788 operates in a mixed manner-a better way _ way _, it becomes a correct Doppler's detailed estimation of compensation, as described later. Bei Yuansheng's maximum output power of 6 (H, and estimates that the target can be connected to the MC-brain radar transmitter and the receiver 4 can be connected. Ming '16_Qam star shown in Figure 5A

To the point of 916 _ stands for the symbol of the 16_QAM nebula figure 9 = The box is divided by up, down, left, and right-16_QAM symbol distance is the policy range _, and the received signal that falls in the box area is the closest -QAM character residue coding position (round black dot). When the error of the fine estimation of the frequency of the echo signal is too large ', the received signal star # decoding position is over. If a region that can correctly decode the nebula is generated, and a decoding error is generated (as shown in Figure 68), the decoding error of Xingdi will reduce the output power of the guide. Conversely, the fine estimation error of the echo frequency of the echo signal falls within the decision range (as shown in Figure 6-3 and Figure 6C1),

Then the receiving signal age falls within the decision region of the correct nebula decoding, and the output power of the de-spreading spectrum is the maximum power value due to the pulse compression gain. The simulated parameters of the radar system are shown in Table 1. Under different conditions of signal-to-noise ratio, 16-QAM and 64_QAM signals were simulated 10,000 target speeds respectively. In the simulation, let's estimate the offset of the Doppler frequency is equivalent to the offset of the estimated moving speed of the target 1 meter / sec; both the FFT and IFFT points are 64, so the number of subcarriers is 64. The Doppler frequency is multiplied by ο ·% to obtain the target moving speed, 乂 is the radar wavelength. As shown in Figure 7, the target speed of the 16-QAM (64-QAM) signal without noise 'single-pulse Doppler processing device can be finely estimated in the range of 17 1241788 l5-138meter / sec⑴3_13〇meter / sec), that is, the target velocity of the single-pulse Doppler processing device (rcsduti () n) is 33 metei> / see (17 annihilation c). Because the present invention reveals that the high-order QAM machine MC_DSSS radar scale resolution increases with qam k-order. Figures 8 and 9 are generated from statistical calculations based on the results. Figure 8 shows that the target speed estimation error of the single-pulse Doppler processing device decreases as the receiver signal-to-noise ratio (SNR) increases; when the receiver SNR exceeds 4.2dB, the target speed estimation error of the 64-QAM signal is less than Called signal. The formula for estimating the standard deviation of the speed error 7 in the figure is M ^ I ^ -122) 2) ± meter / sec ′ where ^ is a detailed estimate of the i-th target speed. Therefore, the present invention discloses that when the receiver SNR is sufficiently large, the read accuracy of the high-order modulation MC-DSSS thunderbolt and the unit single-button processing device increases with the order of the Qam signal. Because the actual speed of the vehicle is l22meter / sec, and the amount of detailed estimation of the target's moving speed is 1 meter / sec, the accuracy rate is defined as the target speed estimated in the 1,000 target speed estimation. Is the probability of appearance of 122 meter / sec. Figure 9 illustrates the curves of the accuracy of a single-pulse metrological device under different signal-to-noise ratio (SNR) conditions. The target velocity estimation accuracy of the single pulse Doppler processing device increases with the receiver signal-to-noise ratio (SNR), and when the receiver SNR exceeds 4.2dB, the target velocity estimation accuracy of the 64-QAM signal is better than 16_qAM. Therefore, when the SNR of this machine is large enough, the accuracy of the single-wave processing device of the high-order QAM modulation Ni Cong radar system increases as the order of the QAM signal increases. 1241788

Modulation (modulation) 16-QAM, 64-QAM carrier frequency 1GHz signal length (symbol interval) 500us target speed (object speed) 122m / s target and radar distance (Range) 93km spreading code length ( DS code length) 128 bits, 192 bits Number of sub carriers 64 Signal-to-Noise Ratio (SNR) 7 ~ 17dB Table 1 Analog parameters of the radar system within the set maximum echo delay time (pulse repetition interval , PRI), using real-time processing, every Doppler frequency estimation (including initial estimation and detailed estimation) is performed at every chip timej interval (chip timej C in turn), and the de-evaluation of each detailed estimation is recorded Frequency output power value. When fresh synchronization is obtained, the finely estimated despread frequency output power will be generated at the target detection position 'maximum due to pulse compression. If the Doppler frequency estimation is not accurate enough', correct frequency synchronization cannot be obtained , Because the receiver cannot obtain the pulse compression gain, its de-spreading output power will not produce the maximum value at the target detection position. Figure 10 shows the completed Doppler frequency under the conditions of 16-QAM and Congxun clutter ratio. Estimate After the shift, perform the distance __de-spread-spectrum output decompression_. = -QAM and Congxun clutter ratio, after completing the Doppler frequency fine estimation to compensate the displacement, perform the distance estimation of the de-spread-spectrum output power curve. The invention ^ Lin Zhizhi's reality _, as expected, this U siege is limited. That is, everything that is done in accordance with the scope of the patent application of the present invention will still not lose the essence of the invention, nor will it depart from the sum of the invention It should be regarded as the further implementation status of the present invention. Target, i 1241788 Based on the above, the present invention has the characteristics of easy operation, simple manufacture and easy assembly, so it can meet the needs of the industry and improve the competitiveness of the industry. It meets the requirements for new model patents as required by the New Patent Law. Therefore, I would like to submit an application for a new patent in accordance with the law. I ask your reviewing committee to allow time for review and grant the patent as a prayer. [Schematic description] 1A is a flowchart of a single-pulse Doppler processing method of the multi-carrier direct sequence spread spectrum radar of the present invention. Figure 1B is a single-pulse Doppler process of the multi-carrier direct sequence spread-spectrum radar of the present invention. Flow chart of the demodulation method of the method. Fig. 2A is a flowchart of a single pulse wave processing method of the multi-carrier direct sequence spread spectrum radar of the present invention. Flow chart of demodulation of pulse wave Doppler processing method. Squeak It C is a detailed estimation calculation process of single pulse wave Doppler initial processing method of multi-carrier direct sequence spread spectrum radar of the present invention. A f is the basic idea of a single-pulse wave graph that does not have a direct sequence of frequency money. The preferred embodiment of the single-pulse Doppler frequency processing device is not intended. Figure 4 shows the relationship between the target echo and the radar signal. Figure H is the light and healthy nebula and maximum likelihood rule (ml) of the final table. Figure 20 1241788 Figure 5B is the modulation waveform signal nebula. Figure r is the echo value of the present invention. Figure ^ is the WQAM nebula with different frequency displacements of the present invention.

Figure 6 C shows the data within the decision range. The exposure speed of the device is estimated. The curve of the target speed estimation error of the center ^ ΓΓ. Figure 9 The accuracy curve of the early pulse wave Doppler processing device. The output power distribution curve of distance estimation in Fig. 10 (16-QAM). Fig. 11 The output power distribution curve of distance estimation (64-QAM). Explanation of drawing number: Secret Wave Doppler processing method 11 ~ 13-step 13-demodulation processing 131 ~ 132-step 2_single pulse doppler processing method of multi-carrier direct sequence spread spectrum radar 21 ～ 24-step / 23- Demodulation processing 231 ～ 232-Step 24- Detailed estimation 241 ～ 248-Step 3_Single pulse Doppler of multi-carrier direct phase spread spectrum radar 31-Frequency reduction processing section, 311 -Mixer 312- Analog / digital converter 21 1241788 32- Frequency preliminary estimation section 321- FFT demodulator 322- Correlator 33- Compensation section 34- Frequency detailed estimation section 341- Fast Fourier transform processor 342- Parallel conversion Serial 343- Nebula Decoder 344- Despreader 345- Distance Estimator 346- Maximum Power Judgment and Signal Frequency Adjuster 4-MC-DSSS Radar System Transmitter and Receiver Device 41- Emitter 411- Pulse Generator 412- Spread Spectrum Encoding Unit 4121-Frequency Spreader 41.22- Nebula Encoder 413- Modulation Transmitter 4131 -Serial to Parallel 4132- Inverting Fast Fourier Transform Processor 4133- Digital / Analog Converter 4134- Mixing 42- signal processing body 421- down-frequency processing unit 4211-mixed wave generation 4212-analog / digital conversion 22 1241788 422- Frequency preliminary estimation section 4221-Fast Fourier transform demodulator 4222-Correlative processor 423-Compensation section 424-Frequency fine estimation section 4241-Fast Fourier transform processor 4242-Parallel to serial 4243-Nebula decoder 4244- Despreader 4425-Signal Frequency Adjuster 425-Distance Estimator 43-Digital Signal Processing Controller 44-Radar Controller 601-Maximum Output Power 602-Output Power 9-16 QAM Nebula Map 900-Decision Area 901 ~ 916-coding position 920-data within decision range 23

Claims (1)

241788 10. Scope of patent application: The single-pulse Doppler processing method of h-sequence spreading, which has 具有 = with—modulation and demodulation—radar transmitting and receiving device, which can generate-single-pulse transmission Believe it, the single = = formed when it detects an object-a single-pulse echo signal, and the mine wither has an input end and an output end, and) the person · (b) the radar transmitting and receiving device The reception is 仃 —demodulation action; ςχπ ^ ~ 槪 (_ 丨 tG Ration, H tifr), and the single-pulse echo signal is transmitted to a fundamental frequency receiving signal through a conversion; ⑻ == signal number Enter the demodulation body through the input terminal, and generate it through the solution-Doppler's initial estimated frequency is output by the output terminal. 2 · If you want to use the method, the conversion is The echo signal is processed at P-band frequency and analog / digital conversion processing. 3. The single-pulse detail of the apparent multiple button sequence __ is used for demodulation, which is to receive the fundamental frequency signal = two fast transmissions. Fast Fieier Transfbrm (fft) to get a soil = harvest, Lai 'and connect the fundamental frequency The amplitude spectrum of the received signal is subjected to a correlation process to obtain the initial estimated frequency of the Doppler. The monopulse side of the multi-carrier direct sequence spread spectrum radar described in item 3 above: Go to 'where the Doppler initial The estimated frequency is the single-pulse Doppler processing method of the two most multi-carrier direct-sequence spread-spectrum radars for which the amplitude spectrum and the amplitude spectrum of the transmitted wave are related to each other. The processing method includes the following steps ... , 糸 24 5. 1241788 (a) Provide a radar with a preliminary estimate and a detailed estimate. The radar transmitting and receiving device can generate a single field pulse wave device. (B) The radar transmitting and receiving device receives a signal. Noise ratio-Bu =, Ya get the single-pulse echo money through-conversion-the fundamental frequency connection = (C) No. is generated by the initial evaluation--action-(d) Emeier: ― 6 '' Single-pulse down-frequency of miscellaneous sequence = = number = r_wave signal-mixed wave 7. = patent 4 scope of application 4 as many as 5 items, in which the second demodulation action == 8. Please ask for special treatment _ ^^ to do not get the initial estimated frequency of Dubule. Podubble processing method, 1 m m ^ wave direct sequence spread spectrum mine The net frequency of the amplitude frequency of the single pulse number spectrum: The frequency of the initial estimation of the second force is the value of the received signal of the fundamental frequency. , Jindu ^ two ^ 'formation-adjust the frequency;. Haidu Buler preliminary estimates and the base frequency received signal, 9' 1241788 and provide a supplementary monk vj 洱 / 々㈣ the compensation signal _ ^^ compensation signal; Received signal spectrum; # Liye transform to get-compensated base frequency ㈣ The compensated base frequency received signal field action, restore to form-edit; No. °: 'row-parallel 1i to serial conversion (e5) pair The coded signal is decoded (Q_code signal is despread;:, = sign; No. power is supplied to the fine estimate body rate and the output signal is From this step to this step, the order advance rate is followed, and the range is repeated to obtain the Doppler detailed estimation frequency. f jn Force rate frequency range 10. According to the wave dubler processing method described in item 9 of the scope of patent application, the maximum power is the single pulse of the frequency radar ^ pulse wave _ gain processing to determine whether the signal is The power of ^^ is 1. As stated in the application, the multi-carrier direct sequence 2 described in the ninth item of the positive side has 2 large output powers. The processing method of Podubler, the Dubuller estimates the frequency based on the product of the maximum number of single pulses and the average value of the most deducted domain /, the number of known high-power times Carry One quickly passes between Fourier transform frequency resolutions. In the plus and minus one knife 13+ wave Ruduqian phase radar, the single pulse can be divided by two. The fast Fourier transform frequency resolution R can be connected to the single pulse of the surface series _ Chuxian Zhi, its transmission "to receive the signal to noise ratio A single-pulse echo signal, this, and its system is-a single-pulse emission signal is formed by reflection when an object is detected. 26 1241788 The system includes: Processing ° 卩 'This system returns the single-pulse echo Signal down-frequency generation-base frequency reception-ί The base frequency is connected to Wt number after processing to generate the initial estimated frequency; 2 Fengjin 仃 compensation formation-compensation signal; The single wave device and an analog / digital conversion processing unit have a -mixer for telecommunication connection in order, and the wave reduction system and the laiby / digital conversion early pulse wave signal down-frequency processing. This _ touches the money in the 16ttit conversion material shaft. 16. The pulse wave Doppler processing in item 14 of the scope of patent 4 deals with the single-leaf transform of m = 1 in the m-sequence spread-spectrum radar in m. The solution σ is reduced by σ. The sequence is more orderly—the fast FM starts. Processor (C〇1TeJ ·), the fast ㈣ ☆ 笹 conversion :: === processor for telecommunication connection 'where the fast Fourier receiver receives the demodulated signal-amplitude spectrum, and: The amplitude spectrum and the monopulse frequency are the initial estimated frequencies of Doppler. Take a large correlation value, a far maximum correlation value. The frequency detailed estimation department is changed and the early Guda ~ Fast Fourier conversion processor is used, which should be compensated = ^ Yes. Shengnong-, it is connected with the parallel conversion serial for telecommunication connection; 妾 '27 1241788 a solution Spreading frequency n 'depends on and transfers "ί; the compensation department is used for telecommunication connection; ^, is connected with the despreading frequency spreader and the supplement 18. Pulse pulse Doppler processing device as described in item 17 of the scope of patent application, The I-carrier direct-sequence spread-spectrum radar passes through the fast pass-through signal, and the despreader, and To; rate ^ column to series, the nebula calcite horsepower, the maximum power touches the frequency adjustment n to perform ^ = noisy signals are provided and the frequency adjuster judges the maximum power of the frequency within a frequency range = for: frequency to The compensation department, == this adjustment can know the corresponding round output power because of the pulse _: Set two people, the capital of the Buller frequency in real time ,,, and two will take the large round output power frequency. After calculation, a detailed estimate of Dubull 19. As described in item 18 of the scope of the patent application, the conversion device of F to Bulle, the second of Dubull's detailed evaluation frequency: the combination of 1 field evaluation items, where the detailed The estimate is the product of the increase ::: The product of the maximum number of sacrifice times and the average of the minimum number of times.... Device, the frequency range is between the positive and negative Fourier transform scale resolution. Π's decision 21. As described in the scope of the patent application No. 18, Doppler processing device, the increase is fast Fourier The quotient divided by the number of times of Doppler frequency estimation. The single-pulse wave Doppler processing device that is straightforward and shunting to the lion and records the wave, which includes the -emitter, which has: 28 1241788 \ The coding department can spread the pulse and encode it. Formed. The Us transmitter can tune the coded signal to form the single-pulse transmission signal for transmission. On the multiple carriers, the multi-carrier direct pulse wave Doppler processing device described in item 22 of the scope of patent application. Among them, the spread spectrum _ material reaches the device and a nebula encoder. Jin more /, there is a spread spectrum 24. The multi-pulse Doppler processing device described in the patent application scope μ, wherein the spread spectrum device is (Sequence, DSSS). ....... 丨 丨 Spread Spectrum (Direct 25 · As described in the application for the 23rd round of the direct sequence pulse Doppler processing device, including the star φ Erzhen Tianda early (Quadrature Amplitude Modulation , QAM)…, the parent amplitude modulation 26. As many as described in the scope of the application for patent 25. Direct phase management device 'where the orthogonal amplitude modulation nebula coded modulation branches are stylized—the modulation method can be used in each Date of the next launch ^ 27 • As described in the application scope of the patent application No. 25 direct sequence and 28 Buller processing device, where the modulation method is dove., Tian Dazhi = Bu Ni sequence radar Single-serial conversion; two sets of two in order has an inverse fast Fourier transform (转换 FFT ^ iFFT), which is related to the data brain; f. Concealed; 29 1241788 a digital / analog converter, its system A telecommunications connection is made with the inverse fast Fourier transform processor; a mixer is used for telecommunications connection with the digital / analog converter. 30