CN110824412A - Non-coherent spread spectrum transponder distance zero value high-precision measurement system - Google Patents
Non-coherent spread spectrum transponder distance zero value high-precision measurement system Download PDFInfo
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- CN110824412A CN110824412A CN201911001642.2A CN201911001642A CN110824412A CN 110824412 A CN110824412 A CN 110824412A CN 201911001642 A CN201911001642 A CN 201911001642A CN 110824412 A CN110824412 A CN 110824412A
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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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/022—Means for monitoring or calibrating
- G01S1/026—Means for monitoring or calibrating of associated receivers
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- G—PHYSICS
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- 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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/022—Means for monitoring or calibrating
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Abstract
The invention relates to a distance zero value high-precision measurement system of an incoherent spread spectrum transponder, which is characterized in that a transmitting signal is coupled to one path and then the power of a self-correcting signal is controlled by a numerical control attenuator, the attenuated signal is converted into receiving frequency after passing through a frequency converter, the frequency-converted signal is coupled to a receiving channel through a coupler, and the zero value measurement of the self-correcting signal is carried out after passing through the receiving channel and AD sampling. In order to not influence the normal function of the responder, the introduced self-correcting signal is controlled by self-adaptive power, and the self-correcting signal is ensured to be lower than a channel with the minimum uplink power by 3 dB; meanwhile, in order to improve the measurement accuracy of the zero value, interference cancellation is carried out on the received signal, multi-access interference cancellation is carried out on other signals except the self-correcting signal before the zero value measurement, and the zero value measurement accuracy can be effectively improved after the interference signal cancellation is carried out. The invention solves the problem of real-time measurement of zero value and improves the zero value measurement precision.
Description
Technical Field
The invention discloses a high-precision distance zero value measurement system for an incoherent spread spectrum transponder, relates to the technical field of measurement and control distance measurement, and particularly relates to high-precision distance zero value measurement for the incoherent spread spectrum transponder.
Background
For the original incoherent spread spectrum transponder, the ranging precision index is better than 1 meter, the zero value change of the transponder is generally less than 0.1 meter, and the zero value change of a channel does not need to be calibrated. However, the high-precision incoherent spread spectrum transponder requires that the ranging error is better than 3 cm, and cannot be realized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention aims to complete real-time measurement of the transponder zero value and correction of system errors, and the transponder can realize uninterrupted and continuous distance zero value on-line measurement within the full-power dynamic change range of an uplink channel, the measurement precision is better than 1 cm, and the requirement that the measurement error of the transponder is better than 3 cm is met.
The above purpose of the invention is realized by the following technical scheme:
a non-coherent spread spectrum transponder range null high accuracy measurement system comprising: the device comprises an output coupler, a numerical control attenuator, a frequency converter, an input coupler, a receiving channel, a transmitting channel and a self-calibration module;
an output coupler: the system comprises a digital control attenuator, a satellite antenna, a digital control attenuator, a digital signal processing module and a digital signal processing module, wherein the digital control attenuator is used for receiving downlink measurement signals which need to be sent to the ground by the satellite and coupling two paths of signals in the downlink measurement signals;
numerical control attenuator: receiving the self-calibration signal transmitted by the output coupler, receiving a power attenuation value transmitted by the self-calibration module, performing attenuation processing on the power of the self-calibration signal according to the power attenuation value, obtaining the self-calibration signal after the attenuation processing, and transmitting the self-calibration signal to the frequency converter;
a frequency converter: receiving the self-correcting signal after the attenuation processing transmitted by the numerical control attenuator, and carrying out frequency conversion processing on the self-correcting signal after the attenuation processing to obtain a self-correcting signal after frequency conversion and transmitting the self-correcting signal to an input coupler;
an input coupler: receiving an uplink signal sent to a satellite by a ground station, receiving a frequency-converted self-calibration signal transmitted by a frequency converter, coupling the frequency-converted self-calibration signal to the uplink signal to obtain a coupled uplink signal, and transmitting the coupled uplink signal to a receiving channel;
receiving a channel: after the coupled uplink signal is subjected to frequency conversion amplification, an intermediate frequency signal is obtained and transmitted to a self-calibration processing module;
a self-calibration processing module: receiving an intermediate frequency signal transmitted by a receiving channel, and capturing an uplink signal and a self-correcting signal in the intermediate frequency signal; sequentially tracking and demodulating the uplink signals to obtain the power value of the uplink signals; carrying out interference cancellation on the uplink signal, and then carrying out tracking demodulation on the self-correcting signal to obtain a zero value stripped from the self-correcting signal by the power value of the self-correcting signal; determining an attenuation control value according to the power value of the uplink signal and the power value of the self-correcting signal and transmitting the attenuation control value to the numerical control attenuator; generating a downlink measurement signal according to a preset format, and transmitting the downlink measurement signal and a zero value frame stripped from a self-correcting signal to an output coupler through a transmitting channel after the downlink measurement signal and the zero value frame are processed;
emission channel: and the downlink measurement signal is output to the output coupler after being subjected to frequency conversion amplification processing.
Compared with the prior art, the invention has the following beneficial effects:
1) the non-coherent spread spectrum transponder distance zero value high-precision measurement system provided by the invention utilizes the coupled downlink ranging as a self-correcting signal, thereby greatly simplifying the complexity of zero value on-track real-time measurement;
2) the incoherent spread spectrum transponder distance zero-value high-precision measurement system provided by the invention cancels the interference of the received signal except the self-correcting signal, can effectively improve the signal-to-noise ratio of the self-correcting signal and improve the zero-value measurement precision of the self-correcting signal;
3) the distance zero value high-precision measurement system of the incoherent spread spectrum transponder provided by the invention utilizes the accurate power estimation of the uplink signal, the accurate power estimation of the self-correcting signal and the numerical control attenuator to carry out power control on the self-correcting signal, and is suitable for a large dynamic application scene of the signal;
4) the distance zero-value high-precision measuring system of the incoherent spread spectrum transponder provided by the invention has clear functional structure, and each part is relatively independent, thereby facilitating the modular design and debugging of the transponder.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
fig. 2 is a block diagram of adaptive control of the self-correcting signal according to the present invention.
Detailed Description
The invention relates to a high-precision distance zero value measuring system of an incoherent spread spectrum transponder, which measures the zero value of the transponder in real time and calibrates the zero value. An independent zero value calibration signal is not adopted, but a downlink measurement signal is adopted as a zero value calibration signal of the responder, so that the design of a single machine is simplified; self-correcting signal self-adaptive control based on uplink channel signal power estimation is adopted, so that the self-correcting signal is always lower than an uplink receiving signal by 3dB in a full-power dynamic range, and normal receiving of the uplink channel signal is not influenced; and the multi-access interference cancellation is utilized to cancel the rest signals except the self-correcting signal, so that the zero value measurement precision is improved.
The invention relates to a non-coherent spread spectrum transponder distance zero value high-precision measurement system, as shown in figure 1, comprising: the device comprises an output coupler, a numerical control attenuator, a frequency converter, an input coupler, a receiving channel, a transmitting channel and a self-calibration module;
an output coupler: the system comprises a digital control attenuator, a satellite antenna, a digital control attenuator, a digital signal processing module and a digital signal processing module, wherein the digital control attenuator is used for receiving downlink measurement signals which need to be sent to the ground by the satellite and coupling two paths of signals in the downlink measurement signals; the insertion loss of the coupler is larger than 30dB, the output signal power is large and generally larger than 20dBm, and the coupled signal is smaller than-10 dBm;
numerical control attenuator: receiving the self-calibration signal transmitted by the output coupler, receiving a power attenuation value transmitted by the self-calibration module, performing attenuation processing on the power of the self-calibration signal according to the power attenuation value, obtaining the self-calibration signal after the attenuation processing, and transmitting the self-calibration signal to the frequency converter; the numerical control attenuation precision is less than 0.5dB, and the range of the numerical control attenuator is 0-75 dB.
A frequency converter: receiving the self-correcting signal after the attenuation processing transmitted by the numerical control attenuator, and carrying out frequency conversion processing on the self-correcting signal after the attenuation processing to obtain a self-correcting signal after frequency conversion and transmitting the self-correcting signal to an input coupler; and converting the self-correcting signal into a receiving frequency, wherein if the frequency of the transmitting signal is f1 and the frequency of the receiving signal is f2, the local oscillation signal of the frequency converter is f2-f1, and the frequency of the converted signal is the receiving frequency f 2. The method specifically comprises the following steps: and the frequency of the self-correcting signal after the attenuation processing is converted into a receiving frequency f2 from f 1.
An input coupler: receiving an uplink signal sent to a satellite by a ground station, receiving a frequency-converted self-calibration signal transmitted by a frequency converter, coupling the frequency-converted self-calibration signal to the uplink signal to obtain a coupled uplink signal, and transmitting the coupled uplink signal to a receiving channel; the insertion loss of the coupler is similar to that of the output coupler and is larger than 30dB, the coupled signal power is always smaller than 3dB of the uplink signal, the signal receiving dynamic is-50 dBm to-110 dBm, the dynamic range of the self-correcting signal after passing through the two-pole coupler and the digital controlled attenuator is-53 dBm to-113 dBm, and the self-correcting signal is variable according to the power of the uplink signal.
Receiving a channel: after the coupled uplink signal is subjected to frequency conversion amplification, an intermediate frequency signal is obtained and transmitted to a self-calibration processing module;
a self-calibration processing module: receiving an intermediate frequency signal transmitted by a receiving channel, and capturing an uplink signal and a self-correcting signal in the intermediate frequency signal; sequentially tracking and demodulating the uplink signals to obtain the power value of the uplink signals; carrying out interference cancellation on the uplink signal, and then carrying out tracking demodulation on the self-correcting signal to obtain a zero value stripped from the self-correcting signal by the power value of the self-correcting signal; determining an attenuation control value according to the power value of the uplink signal and the power value of the self-correcting signal and transmitting the attenuation control value to the numerical control attenuator; generating a downlink measurement signal according to a preset format, and transmitting the downlink measurement signal and a zero value frame stripped from a self-correcting signal to an output coupler through a transmitting channel after the downlink measurement signal and the zero value frame are processed;
emission channel: and the downlink measurement signal is output to the output coupler after being subjected to frequency conversion amplification processing.
The self-calibration module comprises: the device comprises an AD sampling module, a signal capturing module, an uplink signal tracking and demodulating module, a self-correcting signal power control module, a multi-address interference cancellation module, a self-correcting signal tracking and demodulating module, a downlink measurement framing modulating module and a DA converting module;
an AD sampling module: receiving an intermediate frequency signal input by an input coupler, carrying out AD sampling on the input intermediate frequency signal, obtaining a digital signal subjected to AD sampling, and transmitting the digital signal to a signal acquisition module, an uplink signal tracking and demodulation module and a multi-access interference cancellation module;
a signal capture module: receiving an AD sampled digital signal transmitted by an AD sampling module and capturing the signal to obtain an uplink signal and a self-correcting signal in the AD sampled digital signal; capturing the carrier frequency and the code phase of the uplink signal, and outputting the captured carrier frequency and the captured coarse code phase of the uplink signal to an uplink signal tracking and demodulating module; meanwhile, the code phase of the self-correcting signal is roughly captured, and the roughly captured code phase of the self-correcting signal is obtained and output to a self-correcting signal tracking demodulation module;
the uplink signal tracking demodulation module: receiving the carrier frequency of the digital signal after AD sampling transmitted by the AD sampling module and the uplink signal transmitted by the signal capturing module and the rough capturing code phase of the uplink signal, and performing tracking demodulation on the digital signal after AD sampling according to the carrier frequency of the uplink signal and the rough capturing code phase of the uplink signal to obtain the correlation value, the carrier frequency phase, the fine tracking code phase, the symbol information and the signal amplitude of the uplink signal; outputting the correlation value of the uplink signal to a self-correcting signal power control module; simultaneously, outputting the carrier frequency phase, the fine tracking code phase, the symbol information and the amplitude information of the uplink signal to a multiple access interference cancellation module;
a multiple access interference cancellation module: and regenerating the received signals except the self-correcting signals, and performing interference cancellation by utilizing the regenerated signals. Specifically, the method comprises the steps of receiving an AD sampled digital signal transmitted by an AD sampling module, and a carrier frequency phase, a code phase, symbol information and a signal amplitude transmitted by an uplink signal tracking demodulation module, simultaneously regenerating an uplink signal according to the carrier frequency phase, the code phase, the symbol information and the signal amplitude of the uplink signal input by the uplink signal tracking demodulation module to obtain a regenerated uplink signal, performing offset processing on the regenerated uplink signal according to the AD sampled digital signal to obtain a self-correcting signal, and sending the self-correcting signal to a self-correcting signal tracking demodulation module;
the self-correcting signal tracking demodulation module: receiving a self-correcting signal output by the multi-address interference cancellation module, receiving a coarse code capturing phase of the self-correcting signal transmitted by the signal capturing module, performing tracking demodulation on the self-correcting signal according to the coarse code capturing phase of the self-correcting signal, and outputting a correlation value of the self-correcting signal after tracking demodulation to a self-correcting signal power control module; simultaneously, tracking and demodulating to obtain fine tracking code phase and frame time scale information of the self-correcting signal, and outputting the fine tracking code phase and the frame time scale information of the self-correcting signal to a downlink measurement framing module;
a downlink measurement framing module: receiving fine tracking code phase and frame time scale information of a self-correcting signal transmitted by a self-correcting signal tracking demodulation module, stripping a zero value of the self-correcting signal according to the fine tracking code phase and the frame time scale information, simultaneously generating a downlink measuring signal according to a preset format, framing the downlink measuring signal and the zero value stripped from the self-correcting signal, and transmitting the downlink measuring signal and the zero value stripped from the self-correcting signal to an output coupler through a transmitting channel;
the downlink measurement framing module is connected with the transmitting channel through a DA conversion module, and the DA conversion module is used for converting the digital signals transmitted by the downlink measurement framing modulation module into analog signals and outputting the analog signals to the transmitting channel.
The self-correcting signal power control module: receiving a correlation value of an uplink signal input by an uplink signal tracking and demodulating module, estimating the power of the uplink signal according to the correlation value of the uplink signal, and obtaining a power estimation value of the uplink signal; receiving a correlation value of a self-correcting signal input by a self-correcting signal tracking and demodulating module, estimating the power of the self-correcting signal according to the correlation value of the self-correcting signal, and obtaining a power estimation value of the self-correcting signal; and comparing the power estimation value of the uplink signal with the power estimation value of the self-correcting signal to obtain an attenuation control value and outputting the attenuation control value to the numerical control attenuator. The main function is to control the self-correcting signal to change along with the change of the power of the uplink signal, and ensure that the power of the self-correcting signal is always lower than the power of the uplink signal. If the uplink signal contains more channels, the self-correcting signal is guaranteed to be about 3dB lower than the minimum uplink channel signal power. The real-time distance zero value measurement of the responder is ensured, and meanwhile, the uplink signal reception is not influenced.
For the adaptive power control of the self-calibration signal, as shown in fig. 2, the method adopted by the invention is as follows:
the self-correcting signal self-adaptive control technology based on the uplink channel power estimation mainly has the advantages that the self-correcting signal is controlled to change along with the change of the uplink signal power, and the power of the self-correcting signal is guaranteed to be always lower than the uplink signal power. If the uplink signal contains more channels, the self-correcting signal is guaranteed to be about 3dB lower than the minimum uplink channel signal power. The real-time distance zero value measurement of the responder is ensured, and meanwhile, the receiving of the uplink signal is not seriously influenced.
Step 1: when the responder is powered on, the self-correcting channel numerical control attenuator is attenuated to the maximum amount about NmaxAt this time, the power of the self-correcting signal is lower than the receiving sensitivity of the transponder, and the influence of the self-correcting signal on the uplink channel signal can be ignored.
Step 2: after receiving the uplink signals, the responder respectively performs de-spread demodulation to obtain the signal-to-noise ratio estimation values of the uplink signals (obtained by performing intra-symbol correlation integration, de-symbol and whole-frame accumulation averaging on the signals), compares the signal-to-noise ratio estimation values of the signals to obtain the channel Ch with the minimum powermin。
Step 3: according to the minimum channel Ch of the uplink channel powerminThe power of the attenuator controls the self-correcting channel numerical control attenuator, the single control interval is 2 seconds, the attenuation is gradually reduced, and the single attenuation is about 0.5dB of the minimum resolution of the attenuator. Within a single time interval, the transponder is able to complete the acquisition tracking of the self-correcting signal if the self-correcting signal is within the receive sensitivity.
Step 4: after multiple adjustments, the power of the self-calibration signal is adjusted to be about 3dB lower than the uplink minimum channel signal, and the control of the numerical control attenuator is stopped, so that the influence of multiple access interference between the self-calibration signal and the uplink signal is small. And if the uplink channel signal changes, correspondingly adjusting the self-correcting numerical control attenuator according to the estimated value of the signal-to-noise ratio of the uplink channel signal.
Through the above processing, the self-adaptive power control of the self-correcting signal is completed, and the introduced self-correcting signal has no influence on an uplink channel and does not influence the normal remote control instruction sending and ranging functions of the uplink, wherein for the multi-access interference cancellation, the method is adopted as follows:
cancellation of the multiple access signal requires first recovery, also called regeneration, of the multiple access signal. Namely: the responder carries out real-time regeneration on the multi-address signal according to the information obtained after demodulation, and relates to real-time estimation, signal amplitude estimation and the like of a pseudo code sequence, a pseudo code phase, Doppler frequency offset, a carrier phase and symbol information. The algorithm performs signal regeneration based on the series of estimates.
Pseudo code sequence estimation c: the multiple access signals are restricted in 6 signals and 8 pseudo code sequences, namely uplink 1-path remote control (code 1+ code 2), 3-path measurement, downlink 1-path measurement and 1-path remote measurement signal (code 1+ code 2). When the transponder is locked by multiple channels, the channels are mutually multiple-accessed, and signals of all the channels are respectively recovered.
Pseudo code phase estimation τ: the pseudo code phase can be obtained from the pseudo code tracking loop output, so the stable tracking error after the pseudo code tracking loop converges determines the estimation accuracy of the regenerated pseudo code phase. In order to improve the phase estimation accuracy, the pseudo code tracking loop design should be a narrow bandwidth code loop of order 2 or more. In addition, in order to compress the code ring bandwidth to the maximum extent, a carrier ring auxiliary pseudo code tracking ring technology is adopted, and the system error introduced by the dynamic tracking lag of the ultra-narrow bandwidth code ring is eliminated.
Carrier Doppler frequency offset omega and phase estimation tauω: the Doppler frequency offset and the carrier phase can be obtained by outputting from the carrier tracking loop, so that the stable tracking error after the carrier tracking loop converges determines the Doppler frequency offset of the regenerated carrier, particularly the estimation precision of the carrier phase. To improve the phase estimation accuracy, the carrier tracking loop design should be a narrow bandwidth PLL loop above 3 rd order.
Symbol information real-time estimation b (k): the sign information may be derived from the polarity of the signal coherent integrator output.
Signal amplitude estimation a: the sign information may be derived from the magnitude of the coherent integrator output, the coherent integration length being an integer multiple of one symbol unit. The method comprises the following steps: the method comprises the steps of firstly, obtaining a group of coherent integration values with the integration length of one symbol; secondly, after the sign removing operation, accumulating multiple integral values; thirdly, averaging the accumulated integration results to calculate the signal-to-noise ratio of the signal; and fourthly, converting the amplitude of the signal according to the signal-to-noise ratio. Note that: the estimation precision of the signal amplitude directly influences the effect of interference cancellation, and the amplitude estimation error is controlled within 5%.
After obtaining the estimation result, the signal can be reproduced as follows:
the regenerated signal is used for multiple access cancellation of the self-correcting signal. Carrying out cancellation according to the number of signal paths received by the current uplink, and assuming that all uplink signals exist, including a remote control signal s1(n), ranging channel 1 signal s2(n), ranging channel 2 Signal s3(n), ranging channel 3 signal s4(n), telemetry signal s5And (n), the five signals existing in the uplink are cancelled. Suppose that the input signal after AD sampling is ADinThen the self-correcting signal actually demodulates the tracking signal sj(n) is:
sj(n)＝ADin(n)-S1(n)-S2(n)-S3(n)-S4(n)-S5(n)
to sjAnd (n) demodulation tracking is carried out, zero value sampling is carried out on the tracked code phase, and the influence of multiple access interference on zero value precision can be avoided.
For the self-zero value sampling, the following method is adopted:
the transponder uses the frame time stamp t generated by the local clock management unit0(Transmission)Time) of the self-correcting signal, and sampling the pseudo code phase accumulated value of the fine tracking of the self-correcting signal to obtain C0(ii) a Frame time scale t extracted by tracking demodulation based on self-correcting signal1Sampling the accumulated value of the fine pseudo code phase of the self-correcting signal to obtain C1. The responder utilizes the C after sampling1And C0A self-correcting value C for the transponder is obtained. C ═ C1-C0。
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (2)
1. A non-coherent spread spectrum transponder range null high accuracy measurement system comprising: the device comprises an output coupler, a numerical control attenuator, a frequency converter, an input coupler, a receiving channel, a transmitting channel and a self-calibration module;
an output coupler: the system comprises a digital control attenuator, a satellite antenna, a digital control attenuator, a digital signal processing module and a digital signal processing module, wherein the digital control attenuator is used for receiving downlink measurement signals which need to be sent to the ground by the satellite and coupling two paths of signals in the downlink measurement signals;
numerical control attenuator: receiving the self-calibration signal transmitted by the output coupler, receiving a power attenuation value transmitted by the self-calibration module, performing attenuation processing on the power of the self-calibration signal according to the power attenuation value, obtaining the self-calibration signal after the attenuation processing, and transmitting the self-calibration signal to the frequency converter;
a frequency converter: receiving the self-correcting signal after the attenuation processing transmitted by the numerical control attenuator, and carrying out frequency conversion processing on the self-correcting signal after the attenuation processing to obtain a self-correcting signal after frequency conversion and transmitting the self-correcting signal to an input coupler;
an input coupler: receiving an uplink signal sent to a satellite by a ground station, receiving a frequency-converted self-calibration signal transmitted by a frequency converter, coupling the frequency-converted self-calibration signal to the uplink signal to obtain a coupled uplink signal, and transmitting the coupled uplink signal to a receiving channel;
receiving a channel: after the coupled uplink signal is subjected to frequency conversion amplification, an intermediate frequency signal is obtained and transmitted to a self-calibration processing module;
a self-calibration processing module: receiving an intermediate frequency signal transmitted by a receiving channel, and capturing an uplink signal and a self-correcting signal in the intermediate frequency signal; sequentially tracking and demodulating the uplink signals to obtain the power value of the uplink signals; carrying out interference cancellation on the uplink signal, and then carrying out tracking demodulation on the self-correcting signal to obtain a zero value stripped from the self-correcting signal by the power value of the self-correcting signal; determining an attenuation control value according to the power value of the uplink signal and the power value of the self-correcting signal and transmitting the attenuation control value to the numerical control attenuator; generating a downlink measurement signal according to a preset format, and transmitting the downlink measurement signal and a zero value frame stripped from a self-correcting signal to an output coupler through a transmitting channel after the downlink measurement signal and the zero value frame are processed;
emission channel: and the downlink measurement signal is output to the output coupler after being subjected to frequency conversion amplification processing.
2. A non-coherent spread spectrum transponder range null high accuracy measurement system as set forth in claim 1, wherein said self-calibration module comprises: the device comprises an AD sampling module, a signal capturing module, an uplink signal tracking and demodulating module, a self-correcting signal power control module, a multi-address interference cancellation module, a self-correcting signal tracking and demodulating module, a downlink measurement framing modulating module and a DA converting module;
an AD sampling module: receiving an intermediate frequency signal input by an input coupler, carrying out AD sampling on the input intermediate frequency signal, obtaining a digital signal subjected to AD sampling, and transmitting the digital signal to a signal acquisition module, an uplink signal tracking and demodulation module and a multi-access interference cancellation module;
a signal capture module: receiving an AD sampled digital signal transmitted by an AD sampling module and capturing the signal to obtain an uplink signal and a self-correcting signal in the AD sampled digital signal; capturing the carrier frequency and the code phase of the uplink signal, and outputting the captured carrier frequency and the captured coarse code phase of the uplink signal to an uplink signal tracking and demodulating module; meanwhile, the code phase of the self-correcting signal is roughly captured, and the roughly captured code phase of the self-correcting signal is obtained and output to a self-correcting signal tracking demodulation module;
the uplink signal tracking demodulation module: receiving the carrier frequency of the digital signal after AD sampling transmitted by the AD sampling module and the uplink signal transmitted by the signal capturing module and the rough capturing code phase of the uplink signal, and performing tracking demodulation on the digital signal after AD sampling according to the carrier frequency of the uplink signal and the rough capturing code phase of the uplink signal to obtain the correlation value, the carrier frequency phase, the fine tracking code phase, the symbol information and the signal amplitude of the uplink signal; outputting the correlation value of the uplink signal to a self-correcting signal power control module; simultaneously, outputting the carrier frequency phase, the fine tracking code phase, the symbol information and the amplitude information of the uplink signal to a multiple access interference cancellation module;
a multiple access interference cancellation module: receiving an AD sampled digital signal transmitted by an AD sampling module, and a carrier frequency phase, a code phase, symbol information and a signal amplitude transmitted by an uplink signal tracking and demodulating module, simultaneously regenerating an uplink signal according to the carrier frequency phase, the code phase, the symbol information and the signal amplitude of the uplink signal input by the uplink signal tracking and demodulating module to obtain a regenerated uplink signal, performing offset processing on the regenerated uplink signal according to the AD sampled digital signal to obtain a self-correcting signal, and sending the self-correcting signal to the self-correcting signal tracking and demodulating module;
the self-correcting signal tracking demodulation module: receiving a self-correcting signal output by the multi-address interference cancellation module, receiving a coarse code capturing phase of the self-correcting signal transmitted by the signal capturing module, performing tracking demodulation on the self-correcting signal according to the coarse code capturing phase of the self-correcting signal, and outputting a correlation value of the self-correcting signal after tracking demodulation to a self-correcting signal power control module; simultaneously, tracking and demodulating to obtain fine tracking code phase and frame time scale information of the self-correcting signal, and outputting the fine tracking code phase and the frame time scale information of the self-correcting signal to a downlink measurement framing module;
a downlink measurement framing module: receiving fine tracking code phase and frame time scale information of a self-correcting signal transmitted by a self-correcting signal tracking demodulation module, stripping a zero value of the self-correcting signal according to the fine tracking code phase and the frame time scale information, simultaneously generating a downlink measuring signal according to a preset format, framing the downlink measuring signal and the zero value stripped from the self-correcting signal, and transmitting the downlink measuring signal and the zero value stripped from the self-correcting signal to an output coupler through a transmitting channel;
a DA conversion module: converting the digital signal transmitted by the downlink measurement framing modulation module into an analog signal and outputting the analog signal to a transmitting channel;
the self-correcting signal power control module: receiving a correlation value of an uplink signal input by an uplink signal tracking and demodulating module, estimating the power of the uplink signal according to the correlation value of the uplink signal, and obtaining a power estimation value of the uplink signal; receiving a correlation value of a self-correcting signal input by a self-correcting signal tracking and demodulating module, estimating the power of the self-correcting signal according to the correlation value of the self-correcting signal, and obtaining a power estimation value of the self-correcting signal; and comparing the power estimation value of the uplink signal with the power estimation value of the self-correcting signal to obtain an attenuation control value and outputting the attenuation control value to the numerical control attenuator.
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