CN106019268B - The distance-measuring equipment and distance measuring method of stochastic transformation pseudo-code - Google Patents
The distance-measuring equipment and distance measuring method of stochastic transformation pseudo-code Download PDFInfo
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- CN106019268B CN106019268B CN201610424262.XA CN201610424262A CN106019268B CN 106019268 B CN106019268 B CN 106019268B CN 201610424262 A CN201610424262 A CN 201610424262A CN 106019268 B CN106019268 B CN 106019268B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
- G01C5/005—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels altimeters for aircraft
Abstract
The invention discloses the distance-measuring equipment and distance measuring method of a kind of stochastic transformation pseudo-code, mainly solve the problems, such as that the existing altimeter for installing fixed pseudo-code is not suitable with air formation flight, scheme is：The pseudo-code for presetting n kind pattern reads random number and obtains time and the serial number of replacement pattern, continuously generate launch code and local code parallel series output in altimeter operation；After previous launch code sequence end of output, according to the pattern being randomly generated, new launch code sequence is generated, then in previous local code sequence end of output, regenerates new local code sequence；Local code and reception code are made into related operation, when operation result is greater than system threshold value, compares the phase difference of local code and launch code, calculates and give system on height value；Otherwise, so that local code is slided to next chip, repeat related operation computed altitude.Intercept probability of the present invention is low, is avoided that mutual tracking when air formation flight, the measurement that can be used in aerospace flight vehicle to flying height.
Description
Technical field
The invention belongs to ranging technology fields, especially relate to a kind of stochastic transformation pseudo-random code ranging equipment, can be used for aerospace
To the measurement of flying height in aircraft, it can also be used to general radar ranging equipment.
Background technique
Radio altimeter is essential electronic distance-measuring equipment on various aerospace flight vehicles, it can be in various gas
Precise measurement aircraft from the ground or the actual height on sea, can be widely applied to the fields such as aerospace under the conditions of time, such as right
Aircraft carries out real-time elevation carrection.Radio altimeter has there are mainly three types of working system:Pulse regime, CW with frequency modulation system
And pseudo-code continuous wave surveys high system.
Ranging is generally carried out using single pseudo-code in pseudo-random code ranging technology, i.e., pseudo noise code is generated by distance-measuring equipment, then
Radio-frequency transmissions are modulated to by transmitting unit, the signal of target reflection enters receiving unit by receiving antenna, after mixing in output
Frequency signal, the intermediate-freuqncy signal are sent to signal processing unit and carry out operation, by comparing the phase difference of launch code and reception code, meter
Calculate height or distance value.The pseudo-code is one group of " 0 " " 1 " sequence, the different corresponding different patterns that puts in order.
It carries out surveying height in aforementioned manners, in air formation flight, can have the following disadvantages:
Because every airplane equips at least one altimeter, when carrying out surveying high using pseudo-random code ranging system, if each
Altimeter uses same pseudo-code pattern, then in formation flight, the altimeter of an airplane may track other altimeters
Echo-signal, the survey that the tracking of this mistake will will lead to mistake is high as a result, influencing air formation flight safety.
To solve this problem, the prior art uses different pseudo-code patterns, i.e., the altimeter of every airplane equipment is not using
Survey with pseudo-code pattern high, pattern determines when can be dispatched from the factory by factory, can also according to aircraft number before flight situ configuration, but
There is both sides disadvantage again in this method：It on the one hand is pseudo-code pattern limited amount, when formation aircraft quantity is more, unavoidably
It will appear repetition pattern；On the other hand, different patterns is distributed to every airplane before flight every time not only increase workload,
And it is easy error.The normal tracking problem of altimeter is pseudo-random code ranging system altimeter when therefore how to solve multiple aircraft formation flight
A major issue urgently to be solved in use.
Summary of the invention
It is an object of the invention to be directed to the deficiency of above-mentioned prior art, a kind of distance-measuring equipment of stochastic transformation pseudo-code is proposed
And distance measuring method, altimeter normally tracks when solving the problems, such as multiple aircraft formation flight.
Technical thought of the invention is：By setting one group of n kind pseudo-code pattern in distance-measuring equipment in advance, make each equipment
It can be emitted at random using different patterns, and stochastic transformation, to realize, only the machine can be with the launch code of acquisition and tracking the machine, and nothing
Method tracks the effect of the pseudo-code of other equipment transmitting, may be because using same pattern and accidentally grabbing for occurring with solving multiple equipment
Problem.
According to above-mentioned thinking, the distance-measuring equipment of stochastic transformation pseudo-code proposed by the present invention, including：Receiving antenna, transmitting day
Line, transmitting unit, receiving unit, power supply unit, A/D unit, signal processing unit and interface unit, signal processing unit by
DSP and fpga chip composition；The pseudo-code that signal processing unit generates is modulated to radio frequency by transmitting unit, passes through transmitting day after amplification
Line transmitting, the signal reflected from target enter receiving unit by receiving antenna, intermediate-freuqncy signal are exported after mixing and gives A/D unit,
A/D unit gives sampled signal to signal processing unit, in signal processing unit, carries out demodulation operation to sampled signal, knot
It closes local pseudo code sequence and carries out related operation, obtain height value, and export by interface unit, it is characterised in that：
Include in the FPGA：
First launch code registration module is selected for depositing the pseudo-code pattern generated by DSP in the second launch code registration module
When logical, pseudo-code pattern is sent into the second launch code registration module；
Second launch code registration module passes through number for depositing the pseudo-code pattern being sent by the first launch code registration module
Transmitting pseudo-code sequence is sent into according to bus, module occurs, while the enable signal feeding for waiting local symbol counting module to generate is local
Code registration module is latched；
Emit symbol counting module, sends he number for counting, generate the enabled letter of the second launch code registration module
Number, so that the pseudo-code pattern of the first launch code registration module is sent to the second launch code registration module；
Launch code NCO module, for clock needed for generating transmitting pseudo-code sequence；
Emit pseudo-code sequence and module occurs, for transmitting pseudo-code sequence needed for generating equipment work, in launch code NCO mould
Under the clock effect that block generates, transmitting pseudo-code is generated according to the pattern data that the second launch code registration module is sent into, passes through data
Line Serial output；
Local code registration module, it is total by data for depositing the pseudo-code pattern being sent by the second launch code registration module
Line is sent into local pseudo code sequence and module occurs；
Local symbol counting module, for counting local he number, the enable signal of generation local code registration module will
The registered data of second launch code registration module is sent into local code registration module；
Local code NCO module, for generating clock needed for local pseudo code sequence；
Module occurs for local pseudo code sequence, for generating local pseudo code sequence, makees in the clock that local code NCO module generates
Under, local pseudo code sequence is generated according to the pseudo-code pattern of local code registration module deposit, related operation module is given in output；
Computing module is demodulated, demodulation operation is carried out for the signal after sampling to AD, obtains received pseudo-code sequence, is exported
Give related operation module；
Related operation module calculates mould for the local pseudo code sequence reconciliation allocation and transportation that module generates to be occurred for local pseudo code sequence
The reception pseudo-code sequence that block obtains carries out serial XOR operation and adds up, and accumulation result and local code phase information are sent into
It is handled in DSP；
Include in the DSP：
Random code generation module is arrived for generating the serial number for the pattern for preparing replacement and the time of replacement in subsequent time
Selected pattern is passed through into the first launch code registration module in data/address bus write-in FPGA when coming；
Local code shift control and height resolve module, and the data for being sent into according to related operation module carry out operation,
I.e. by comparing the phase difference of current launch code and local code, exported after being scaled distance or height value；Local code is controlled simultaneously
NCO, local symbol counting module and demodulation computing module, enable distance-measuring equipment to continue to track correct height distance.
According to above-mentioned thinking, stochastic transformation Pseudo Code Ranging Method proposed by the present invention, including:
1) one group of different pseudo-code of pattern is preset in dsp, in equipment work, randomly chooses a kind of pseudo-code code
Type, and the time is randomly choosed by pseudo-code pattern feeding register deposit；
2) each pseudo-code pattern generates a pseudo-code sequence, and each pseudo-code sequence includes the different symbol that puts in order, if
When standby work, is continuously generated respectively for the pseudo-code sequence of transmitting and local pseudo code sequence parallel series output, emit pseudo-code sequence
Digital modulation is carried out to carrier wave and emits the modulated signal；After previous transmitting pseudo-code sequence end of output, register deposit
Pseudo-code pattern regenerates new transmitting pseudo-code sequence；
3) receiving end receives the echo-signal of modulated signal, becomes intermediate-freuqncy signal；
4) demodulation operation is carried out to intermediate-freuqncy signal, obtains received pseudo-code signal；
5) after generating new transmitting pseudo-code sequence, and in previous local pseudo code sequence end of output, register deposit
Pseudo-code pattern regenerate new local pseudo code sequence；
6) received pseudo-code signal and current local pseudo code sequence are subjected to related operation, i.e., by received pseudo-code signal with
Current local pseudo code sequence carries out serial XOR operation and adds up；
7) new local pseudo code sequence reconciliation allocation and transportation are generated according to correlation result control to calculate, makes current local pseudo-code
Sequence is synchronous with received pseudo-code signal, even if accumulated value is maximum；
8) in the state that current local pseudo code sequence is synchronous with current reception pseudo-code signal, by local pseudo code sequence and hair
The phase difference penetrated between pseudo-code sequence acquires transmitting pseudo-code sequence in the time t of spatial, and then calculates distance or high
Angle value：R=C*t/2, wherein C is the light velocity, and t=φ * τ, τ are symbol width.
The present invention due to presetting one group of different pseudo-code of pattern in dsp, in equipment work, random selection one
Kind pseudo-code pattern, and the time is randomly choosed by pseudo-code pattern feeding register deposit, the pseudo-code that pattern changes at random is generated, it is complete
At pseudo-random code ranging, thus compared with present fixed pattern completes pseudo-random code ranging, have the following advantages that:
1. when aircraft equips two or more altimeters or air formation flight, the case where being not in mutual tracking；
2. intercept probability is very low；
3. in the very good solution radio altimeter technology of pseudo-random code ranging system the problem of pseudo-code lazy weight, no longer
It needs to distribute every airplane different patterns, reduce workload and will not malfunction, greatly reduce this system altimeter
Installation difficulty；
4. the minor lobe relevant peaks for avoiding altimeter pseudo-code correlation from generating, prevent from accidentally grabbing；
5. piece short in size correlation is avoided erroneous judgement caused by peak value occur.
Detailed description of the invention
Fig. 1 is the schematic illustration of existing radio altimeter；
Fig. 2 is the signal processing unit structure chart in the present invention；
Fig. 3 is stochastic transformation pseudo-random code ranging flow chart of the present invention.
Specific embodiment
Referring to Fig.1, existing radio altimeter includes：Receiving antenna, transmitting antenna receive high frequency cable, transmitting high frequency
Cable, radio-frequency receiving-transmitting component, power supply unit, A/D unit, signal processing unit and interface unit, wherein：Signal processing unit,
Including DSP+FPGA signal processing model；Radio-frequency receiving-transmitting component, including transmitting unit and receiving unit.
Signal processing unit generates fixed transmitting pseudo-code sequence, is modulated to and is penetrated by the transmitting unit of radio-frequency receiving-transmitting component
Frequently, it is transferred to transmitting antenna by emitting high frequency cable after amplification, transmitting antenna emits to the ground；Believe from the echo of ground return
Number pass through receiving antenna, by receive high frequency cable be input to receiving unit, after being mixed to echo-signal export intermediate frequency letter
Number, then A/D sampling is carried out after passing sequentially through bandpass filtering, gain-controlled amplifier, it is converted into digital medium-frequency signal；It is re-fed into letter
Number processing unit carries out demodulation process, and digital medium-frequency signal is down-converted to baseband signal, which is to emit pseudo-code
Reception pseudo-code sequence of the sequence after time delay, baseband signal accumulating operation related to local pseudo-code progress, calculated result
Be compared with thresholding, greater than thresholding then more local pseudo-code and receive pseudo-code phase difference, calculate height value, pass through interface
System module is given on unit, pseudo-code is otherwise controlled and slides to next chip, repeats related accumulating operation, and comparison threshold calculates
Height out；Power supply unit mainly meets the power reguirements of each unit.
In above-mentioned existing signal processing unit, due to only generating fixed pseudo-code sequence, it is unsuitable for flying for formation flight
Machine, this is because every airplane equips at least one altimeter, according to same pseudo-code pattern, then the height of an airplane
Table may track the echo-signal of other aircraft altitude tables, and the tracking of this mistake will will lead to the survey height of mistake as a result, shadow
Ring air formation flight safety.
For this purpose, the present invention improves the structure of signal processing unit, can stochastic transformation pseudo-code, and convert pseudo-code
Time be it is random, the pseudo-code sequence converted every time be also it is random, when ensuring that air formation flight in this way, each
The pseudo-code sequence of altimeter will not be identical, and then guarantees the safety of air formation flight.
Referring to Fig. 2, for the signal processing unit in the present invention, including FPGA and DSP, wherein FPGA is written according to DSP
The data of replacing construction and pattern serial number generate the transmitting pseudo-code changed at random and local pseudo-code, and to the digital intermediate frequency of input
Signal carries out down coversion and demodulates operation, becomes baseband signal, and baseband signal and local code carry out related operation, by correlated results,
Phase difference is sent into DSP；Correlated results that DSP is sent by FPGA, phase difference control the movement and computed altitude of local pseudo-code
Value, while the serial number of replacement pattern and the time of replacement are generated, selected pattern is passed through into data/address bus when subsequent time arrives
FPGA is written.
In the DSP, including：Random code generation module 12 and local code shift control and height resolve module 13, wherein
The time for being equipped with the serial number for the pseudo-code pattern replaced at random in random code generation module 12 and replacing at random.
In the FPGA, including：First launch code registration module 1, the second launch code registration module 2, transmitting cell count
Module 3, launch code NCO module 4, transmitting pseudo-code sequence occur module 5, local code registration module 6, local symbol counting module 7,
Module 9, demodulation computing module 10, related operation module 11 occur for local code NCO module 8, local pseudo code sequence.
The signal transitive relation of entire signal processing unit is as follows:
Selected pseudo-code pattern is written the first launch code registration module 1 by data/address bus and posted by random code generation module 12
It deposits；
Emit symbol counting module 3 and generates enable signal, the pseudo-code pattern data that the first launch code registration module 1 is deposited
It is sent into the second launch code registration module 2, the second launch code registration module 2 latches pseudo-code pattern data and is sent into transmitting pseudo-code sequence
Module 5 occurs；
Emit pseudo-code sequence and module 5 occurs, under the clock effect that launch code NCO module 4 generates, according to the second launch code
The pseudo-code pattern data that registration module 2 is sent into generate transmitting pseudo-code, by data line Serial output to transmitting unit；
Local symbol counting module 7 is generated in the case where local code shift control and height resolve the control of module 13 to local code
The pseudo-code pattern data that second launch code registration module 2 is deposited are sent to local code deposit mould by the enable signal of registration module 6
Pseudo-code pattern data are sent into local pseudo code sequence by data/address bus and module 9 occur by block 6, local register module 6；
Local code NCO module 8 generates clock signal in the case where local code shift control and height resolve the control of module 13, and
Clock signal is sent into local pseudo code sequence, module 9 occurs；
Module 9 occurs for local pseudo code sequence, under the clock effect that local code NCO module 8 generates, is deposited according to local code
The pseudo-code pattern data that module 6 is deposited generate local pseudo code sequence, export to related operation module 11；
Computing module 10 is demodulated in the case where local code shift control and height resolve the control of module 13, A/D is sampled and receives letter
Number demodulation operation is carried out, obtain received pseudo-code sequence, exported to related operation module 11；
The local pseudo code sequence and demodulation computing module that related operation module 11 generates local pseudo code sequence generation module 9
10 obtained reception pseudo-code sequences carry out serial XOR operation and add up, and accumulation result and local pseudo-code phase information are sent into
Local code shift control and height, which resolve, carries out operation, judgement processing in module 13；
Local code shift control and height resolve module 13, carry out accumulation fortune according to the data that related operation module 11 is sent into
It calculates, and operation result is compared with scheduled noise voltage thresholding, if operation result is greater than the threshold value, compare at this time
Local pseudo-code and the phase difference for receiving pseudo-code, calculate height value：R=C*t/2, wherein C is the light velocity, and t=φ * τ, t are delay
Time, φ are phase difference, and τ is symbol width；By calculated height value R by giving system module on interface unit；Otherwise,
It controls local code NCO module 8 and generates clock signal, local 7 generation enable signal of symbol counting module and demodulation computing module 10
Control signal is generated, pseudo-code is made to slide to next chip, related accumulating operation is repeated, accumulates operation, comparison threshold calculates height
Degree.
Referring to Fig. 3, stochastic transformation Pseudo Code Ranging Method of the invention carries out according to the following procedure:
Step 1. from prestore in random code generation module randomly choose a pseudo-random code sequence.
One group of pseudo noise code is preset, wherein the pattern of kind containing n, each pattern is the binary number of a 16bits,
When altimeter is run, random number is read, low four of random number are taken, adds irreducible minimum fixed number, as meter needed for pattern replacement
Numerical value, multiplied by time in counting interval 0.1ms, the as time of replacement next time pattern；
Count value is added and works as former code serial number again with 0x7 progress and operation, prevents array from overflowing to eliminate a high position, obtains down
The serial number of secondary pattern to be replaced；
The serial number of pattern is sent into register deposit according to the time of replacement pattern.
Step 2. generates launch code and local code.
According to step 1, each pseudo-code pattern is a primitive polynomial, and altimeter selects 10 m-sequences as pseudo-code,
Have a n kind pseudo-code pattern, randomly choose one of pseudo-code pattern, by module taps approach MSRG continuously generate transmitting pseudo-code and
Local pseudo-code parallel series output, i.e., carry out mould 2 and operation by respective feedback tap by 10 grades of shift registers；The module tap
The pseudo-code for determining n kind difference code type, that is, correspond to the different primitive polynomial of n kind, and n is more than or equal to 8.
Launch code is modulated to radio frequency by step 3. transmitting unit, is emitted to the ground by transmitting antenna.
The transmitting pseudo-code generated by step 2 carries out phase-modulation to the local oscillation signal that transmitting unit generates, and transmitting is pseudo-
Code is modulated to radio frequency, amplifies radiofrequency signal using power amplifier, radiofrequency signal is emitted to the ground by transmitting antenna；
After previous transmitting pseudo-code sequence end of output, according to the pseudo-code pattern that step 1 register is deposited, regenerate new
Emit pseudo-code sequence, is modulated to radio frequency, is emitted to the ground by transmitting antenna；
The transmitting pseudo-code sequence phase regenerated is not controlled by DSP, i.e., after the output of transmitting pseudo-code sequence, automatic weight
It is newly-generated and export, and its symbol width is constant.
After generating new transmitting pseudo-code sequence, and in previous local pseudo code sequence end of output, deposited according to step 1
The pseudo-code pattern of device deposit, then generate into new local pseudo code sequence, wherein the new local pseudo code sequence generation is controlled by DSP
System, phase constantly adjust, i.e., generate local pseudo code sequence by delay or change the symbol width of local pseudo code sequence, to change
Become the time that local pseudo code sequence regenerates.
Step 4. receiving antenna receives echo-signal, becomes intermediate-freuqncy signal by receiving unit.
Receiving antenna receives ground echo signal, and echo-signal is sent into receiving unit, and receiving unit is to echo-signal
After carrying out low noise amplification, mixing and intermediate frequency amplification, become intermediate-freuqncy signal.
Step 5.AD cell pairs frequency signal is sampled, and digital medium-frequency signal is become.
AD cell pairs frequency signal is sampled, and after becoming digital medium-frequency signal, is sent into demodulation computing module.
Step 6. demodulates computing module and digital medium-frequency signal is down-converted to baseband signal.
After digital medium-frequency signal is mixed, is filtered with digital intermediate frequency local oscillation signal by demodulation computing module, down-convert to
Baseband signal, the baseband signal are the reception pseudo-code sequence for emitting pseudo-code sequence after time delay.
Step 7. baseband signal and local pseudo-code carry out related operation；
By baseband signal accumulating operation related to the progress of current local pseudo code sequence, and by operation result and local pseudo-code phase
Position information is sent into control and height computing module；
Step 8. controls local pseudo-code movement and height calculates and exports height.
Control and height computing module carry out accumulation operation according to the data of related operation, and by operation result with it is scheduled
Noise voltage thresholding is compared：
If operation result is greater than the threshold value, compares local pseudo-code at this time and receive the phase difference of pseudo-code, calculate height
Angle value：R=C*t/2, wherein C is the light velocity, and t=φ * τ, t are delay time, and φ is phase difference, and τ is symbol width degree of being；It again will meter
The height value R of calculating is by giving system module on interface unit；
Otherwise, return step 6 make local pseudo-code slide to next chip, repeat related accumulating operation, accumulate operation, than
Compared with thresholding, height is calculated.
The present invention is applied to pseudo-code continuous wave and surveys high system altimeter, but is not limited to altimeter field, uses pseudo-random code ranging
Method of the present invention can be used in the field of technology.
Above description is only example of the present invention, it is clear that for those skilled in the art, is being understood
After the content of present invention and principle, all it may be carried out in form and details without departing substantially from the principle of the invention, structure
Various modifications and variations, but these are that the modifications and variations based on inventive concept still protect model in claim of the invention
Within enclosing.
Claims (4)
1. a kind of distance-measuring equipment of stochastic transformation pseudo-code, including：Receiving antenna, transmitting antenna, transmitting unit, receiving unit, electricity
Source unit, A/D unit, signal processing unit and interface unit, signal processing unit are made of DSP and fpga chip；At signal
The pseudo-code that reason unit generates is modulated to radio frequency by transmitting unit, is emitted after amplification by transmitting antenna, the signal reflected from target
Enter receiving unit by receiving antenna, intermediate-freuqncy signal is exported after mixing and gives A/D unit, A/D unit gives sampled signal to letter
Number processing unit carries out demodulation operation to sampled signal in signal processing unit, carries out related fortune in conjunction with local pseudo code sequence
It calculates, obtains height value, and export by interface unit, it is characterised in that：
Include in the FPGA：
First launch code registration module (1) is selected for depositing the pseudo-code pattern generated by DSP in the second launch code registration module
When logical, pseudo-code pattern is sent into the second launch code registration module；
Second launch code registration module (2) passes through for depositing the pseudo-code pattern being sent by the first launch code registration module (1)
Data/address bus is sent into transmitting pseudo-code sequence and module (5) occurs, while the enable signal for waiting local symbol counting module to generate is sent
Enter local code registration module (6) to be latched；
Emit symbol counting module (3), send he number for counting, generates the enabled of the second launch code registration module (2)
Signal makes the pseudo-code pattern of the first launch code registration module be sent to the second launch code registration module；
Launch code NCO module (4), for clock needed for generating transmitting pseudo-code sequence；
Emit pseudo-code sequence and module (5) occur, for transmitting pseudo-code sequence needed for generating equipment work, in launch code NCO mould
Under the clock effect that block (4) generates, transmitting pseudo-code is generated according to the pattern data that the second launch code registration module (2) is sent into, is led to
Cross data line Serial output；
Local code registration module (6) passes through data for depositing the pseudo-code pattern being sent by the second launch code registration module (2)
Bus is sent into local pseudo code sequence and module (9) occurs；
Local symbol counting module (7) generates the enable signal of local code registration module (6) for counting local he number,
The registered data of second launch code registration module (2) is sent into local code registration module；
Local code NCO module (8), for generating clock needed for local pseudo code sequence；
Module (9) occur for local pseudo code sequence, for generating local pseudo code sequence, in the clock that local code NCO module (8) generates
Under effect, local pseudo code sequence is generated according to the pseudo-code pattern of local code registration module (6) deposit, related operation module is given in output
(11)；
It demodulates computing module (10), carries out demodulation operation for the signal after sampling to AD, obtain received pseudo-code sequence, export
Give related operation module (11)；
Related operation module (11) conciliates allocation and transportation for the local pseudo code sequence that module (9) generate to be occurred for local pseudo code sequence
It calculates the reception pseudo-code sequence that module (10) obtain to carry out serial XOR operation and add up, and accumulation result and local code phase is believed
Breath is sent into DSP and is handled；
Include in the DSP：
Random code generation module (12) is arrived for generating the serial number for the pattern for preparing replacement and the time of replacement in subsequent time
Selected pattern is passed through into the first launch code registration module (1) in data/address bus write-in FPGA when coming；
Local code shift control and height resolve module (13), for being transported according to the data that related operation module (11) are sent into
It calculates, i.e., by comparing the phase difference of current launch code and local code, is exported after being scaled distance or height value；Local is controlled simultaneously
Code NCO module (8), local symbol counting module (7) and demodulation computing module (10), enable distance-measuring equipment to continue tracking correct
Height distance；
The local code shift control and height resolve module (13), including：
It demodulates control submodule (131), for carrying out catching for carrier frequency to the signal after AD sampling according to correlation result
It obtains and tracks, to obtain received pseudo-code sequence by AD sampled signal；
Local code shift control submodule (132) makes to work as controlling the phase of local pseudo code sequence according to correlation result
Preceding local pseudo code sequence is synchronous with received pseudo-code signal；
Height resolves submodule (133), is used in the state that current local pseudo code sequence is synchronous with current reception pseudo-code signal,
Distance or height value are acquired by phase difference between the two.
2. a kind of distance measuring method of stochastic transformation pseudo-code, which is characterized in that include the following steps：
1) one group of different pseudo noise code of pattern is preset in dsp, in equipment work, randomly chooses a kind of pseudo-code code
Type, and randomly choose the time by pseudo-code pattern feeding register deposit, i.e.,：
Preset one group of different pseudo noise code of pattern, wherein the pattern of kind containing n, each pattern be a 16bits two into
Number processed when altimeter is run, reads random number, takes low four of random number, adds irreducible minimum fixed number, and as pattern replaces institute
Count value is needed, multiplied by time in counting interval 0.1ms, the as time of replacement next time pattern；
Count value is added and works as former code serial number again with 0x7 progress and operation, prevents array from overflowing to eliminate a high position, obtains next desire
Replace the serial number of pattern；
The serial number of pattern is sent into register deposit according to the time of replacement pattern；
2) each pseudo-code pattern generates a pseudo-code sequence, and each pseudo-code sequence includes the different symbol that puts in order, equipment work
It when making, is continuously generated respectively for the pseudo-code sequence of transmitting and local pseudo code sequence parallel series output, emits pseudo-code sequence to load
Wave carries out digital modulation and emits the modulated signal；After previous transmitting pseudo-code sequence end of output, the pseudo-code of register deposit
Pattern regenerates new transmitting pseudo-code sequence；
3) receiving end receives the echo-signal of modulated signal, becomes intermediate-freuqncy signal；
4) demodulation operation is carried out to intermediate-freuqncy signal, obtains received pseudo-code signal；
5) after generating new transmitting pseudo-code sequence, and in previous local pseudo code sequence end of output, the puppet of register deposit
Code pattern regenerates new local pseudo code sequence；
6) received pseudo-code signal and current local pseudo code sequence are subjected to related operation, i.e., by received pseudo-code signal and currently
Local pseudo code sequence carry out serial XOR operation and add up；
7) new local pseudo code sequence reconciliation allocation and transportation are generated according to correlation result control to calculate, makes current local pseudo code sequence
It is synchronous with received pseudo-code signal, even if accumulated value is maximum；
8) pseudo- by local pseudo code sequence and transmitting in the state that current local pseudo code sequence is synchronous with current reception pseudo-code signal
Phase difference between code sequence acquires transmitting pseudo-code sequence in the time t of spatial, and then calculates distance or height value：
R=C*t/2, wherein C is the light velocity, and t=φ * τ, τ are symbol width.
3. according to the method described in claim 2, wherein step 2) and 5) in register deposit pseudo-code pattern regeneration it is new
Emit pseudo-code sequence and local pseudo code sequence, is to be generated according to the pseudo-code pattern deposited using module taps approach MSRG.
4. according to the method described in claim 2, wherein being continuously generated respectively in step 2) for the pseudo-code sequence of transmitting and this
Ground pseudo-code sequence is the pseudo-code pattern deposited according to register, is generated using module taps approach MSRG, when every kind of pseudo-code sequence
After column output, then regenerates and export, wherein the generation of local pseudo code sequence is controlled by DSP, and phase constantly adjusts,
Local pseudo code sequence is generated by delay or changes the symbol width of local pseudo code sequence, to change local pseudo code sequence again
The time of generation；The transmitting pseudo-code sequence phase regenerated is not controlled by DSP, i.e., after the output of transmitting pseudo-code sequence, from
It is dynamic to regenerate and export, and its symbol width is constant.
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