CN103675845A - Single-carrier multiple-antenna occultation signal generation system - Google Patents

Abstract

A single-carrier multiple-antenna occultation signal generation system includes a direct star - occultation data real-time generation unit and a direct star - occultation signal real-time generation unit. The direct star - occultation data real-time generation unit is used to generate an accumulative parameter and a power control code corresponding to direct star and occultation observation data; and the direct star - occultation signal real-time generation unit uses the inputted accumulative parameter and power control code to generate a five-way radio frequency signal output which respectively includes a direct star channel, a front neutral atmosphere channel, a front ionized layer channel, a rear neutral atmosphere channel, and a rear ionized layer channel. The single-carrier multiple-antenna occultation signal generation system can simulate a navigation positioning signal, an ionized layer occultation signal and a neutral atmosphere occultation signal, so that the single-carrier multiple-antenna occultation signal is truly realized; and the occultation signal source parallel with the simulation network can be formed to carry out the multi-star occultation signal simulation.

Description

A kind of single many antennas of carrier occultation signal generating system

Technical field

The present invention relates to a kind of single many antennas of carrier occultation signal generating system, belong to Satellite Navigation Technique field.

Background technology

LEO occultation technology is GNSS(Global Navigation Satellite System) in the expanded application in atmospheric seeing field, it utilizes variations in refractive index that GNSS signal occurs when communication media (ionosphere and neutral atmosphere) is propagated and then phase delay and the amplitude information of generation, be finally inversed by ionospheric electron density in time, season, geographic position, solar activity level (space environment) change and the variation on neutral atmosphere inversion layer, atmospheric gravity waves, sharp side, at present, LEO occultation technology has developed into the powerful measure of meteorology research.

Both at home and abroad the research of LEO occultation technology is mainly reflected on Occultation receiver research and occultation reception data inversion algorithm research at present, the research of this two aspect all needs a large amount of field trials, test site (being mainly height), test condition are had to strict restriction, because being vulnerable to disturb, controllability, the repeatability of test are all very poor, the occultation signal simulation Generation Technology being born under this background, can be divided into two kinds: pure software emulation generation and radiofrequency signal emulation generate.Current research both domestic and external mainly concentrates on pure software emulation generation phase, mainly by 3 D ray, follow the trail of forward simulation technology and realize the simulation to phase delay, amplitude conversion, for occultation being received to the research of data inversion algorithm, but this mode cannot meet equipment test, the testing requirements such as Occultation receiver, occultation antenna, the radio frequency simulation technology that therefore develops occultation signal becomes inevitable choice.The radio frequency simulation of occultation signal generates not only emulation and generates occultation signal, also comprise the emulation of through star signal is generated, simulated the overall process of occultation event from occurring disappearing, can realize the inverting function afterwards of occultation forecast, high speed acquisition, open-loop tracking and reception data to Occultation receiver and carry out closed-loop test.Really occultation forward simulation technology can be applied at present to physical radio emulation generates, there is relevant research work in domestic Space Star Technology Co., Ltd., applies for being entitled as < < system for generating satellite navigation occultation signal (application number: the 201110120273.6) patent of > >.

Summary of the invention

The object that technology of the present invention is dealt with problems is: overcome the deficiencies in the prior art, a kind of single many antennas of carrier occultation signal generating system has been proposed, native system can simulate through star passage, neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage, passage Zhe Wu road, backward ionosphere radiofrequency signal, has realized the generation to single many antennas of carrier occultation signal.

Technical solution of the present invention is:

Single many antennas of carrier occultation signal generating system can simulate through star passage, neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage and passage Zhe Wu road, backward ionosphere radiofrequency signal simultaneously; Native system comprises: the through real-time generation unit of star-occultation data, the through real-time generation unit of star-occultation signal, control computing machine and occultation constellation simulation unit;

Described occultation constellation simulation unit is transferred to the real-time productive unit of through star-occultation data by the observation data of the through star generating, occultation by reflective memory network interface card and carries out data processing;

The real-time generation unit of described through star-occultation data is according to the steering order (setting according to user's request) of the observation data of occultation constellation analogue system input and control calculating, generate in real time cumulative parameter and the power control code of through star and occultation, and send it to the real-time generation unit of through star-occultation signal; Described cumulative parameter comprises pseudo-code ring parameter and carrier wave ring parameter;

The real-time generation unit of described through star-occultation signal, according to unified clock signal, utilizes cumulative parameter and the power control code of through star and Observation of Occultation data to generate five tunnel radiofrequency signals, and Bing Jiang five tunnel radiofrequency signals are sent to tested occultation and receive load system; Described Wu road radio frequency signal channels comprises through star passage, neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage, backward ionosphere passage.

The real-time generation unit of described through star-occultation data comprises main control module, high-performance treatments module, gigabit ethernet card and reflective memory network interface card;

Main control module receives from the steering order of controlling computing machine by gigabit ethernet card, and according to steering order realize the through real-time generation unit of star-occultation data overall control (overall control comprise signal generate start, stop, the control such as modulation system);

The observation data from occultation constellation simulation unit that the utilization of high-performance treatments module is received by Reflective memory network clamping, and utilize observation data to generate pseudo-code ring parameter, carrier wave ring parameter and power control code, by optical fiber, be sent to the real-time generation unit of through star-occultation signal;

The described method of utilizing observation data generation pseudo-code ring parameter, carrier wave ring parameter and power control code is as follows:

(a) computing method of pseudo-code ring parameter and carrier wave ring parameter:

$k_0=K_0\&times;2^{M_0}$

$k_1=2^{C_1}\&times;(K_1+\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}{2}+\frac{K_3}{6})\&times;2^{M_0}$

${\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">k</figure-callout>}}_2=2^{C_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}\&times;({\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">K</figure-callout>}}_2+K_3)\&times;2^{M_1}$

$k_3=2^{C_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}\&times;K_3\&times;2^{{\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_2}$

Wherein, k ₀, k ₁, k ₂and k ₃for pseudo-code ring or carrier wave ring parameter, C ₁and C ₂for blocking figure place, M ₀, M ₁and M ₂for the bit wide of pseudo-code three rank totalizers, for the calculating of pseudo-code ring parameter and carrier wave ring, C ₁, C ₂, M ₀, M ₁and M ₂value is different; K ₀, K ₁, K ₂and K ₃for intermediate variable:

$K_0=\frac{R_0}{c},K_1=\frac{v}{{\mathrm{cf}}_s},{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">K</figure-callout>}}_2=\frac{a}{{{\mathrm{<figure-callout\; id="2"\; label="cf\; s"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">cf</figure-callout>}}_s}^2},K_3=\frac{b}{{{\mathrm{cf}}_s}^3}$

R ₀it is pseudorange initial value, v arrives for the star-occultation of going directly the radial velocity that tested occultation receives load system, and a is the radial acceleration that tested occultation reception load system is arrived in through star-occultation, and b is the radially acceleration of star-occultation to tested occultation reception load system that go directly, c is the light velocity, f _sfor sample frequency;

(b) computing method of power control code:

$K=K_A\&CenterDot;\sqrt{\frac{P_s+K_{\mathrm{sv}\_r}-3}{P_{s0}}}\&CenterDot;\frac{1}{N}$

Wherein, K is power control code, K _acontrol code while being emulation single channel during power maximal value, P _sthe performance number in observation data, K _{sv_r}be emulation passage number modifying factor, N is emulation total number of channels, P _s0it is the minimum of power in observation data.

The real-time generation unit of described through star-occultation signal comprise data broadcast control module, through star navigation baseband module, forward direction occultation navigation baseband module, backward occultation navigation baseband module, time frequency module and radio-frequency module;

Data are broadcast control module according to controlling the generation of through star navigation baseband signal, forward and backward occultation baseband signal from the steering order of controlling computing machine and being exported by through star passage, ionosphere passage and person's neutral atmosphere passage;

Through star navigation baseband module, navigation forward baseband module and rear navigation baseband module receive respectively the through star that the real-time generation unit of through star-occultation data sends, the cumulative parameter of forward and backward occultation and power control code, and according to cumulative calculation of parameter, obtain the phase place of carrier wave meter and code table, according to the phase place of the code table calculating, in pseudo-code code table and carrier wave meter, table look-up and obtain carrier wave and pseudo-code, then utilize the carrier wave and the pseudo-code that obtain to modulate, filtering, close road, and multiply each other and carry out power adjustment and obtain through star and forward direction with power control code, the digital medium-frequency signal of backward occultation,

Time frequency module be used to the real-time generation unit of through star-occultation signal that unified clock signal is provided;

Radio-frequency module is used for the digital medium-frequency signal of through star to be carried out up-conversion, the digital medium-frequency signal of forward direction occultation is carried out to up-conversion, the digital medium-frequency signal of backward occultation is carried out to up-conversion by backward neutral atmosphere passage, backward ionosphere passage by neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage by through star passage, and up-conversion Hou five road signals are sent to tested occultation reception load system.

The present invention compared with prior art tool has the following advantages:

(1) the invention provides a kind of single many antennas of carrier occultation radiofrequency signal generation system, on the basis of existing technology the refinement of occultation signal is divided into neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage, backward ionosphere passage, and then generate more exactly occultation signal, the present invention has realized Ionospheric occultation antenna, neutral atmosphere occultation antenna, Occultation receiver, occultation post-processing algorithm has been carried out to integration utilization and the system verification of full link in the mode of radiofrequency signal emulation, has guaranteed the reliability of system and radio frequency signal generation.

(2) single many antennas of carrier occultation radiofrequency signal generation system that the present invention proposes can be broadcast control software running platform by the data of through star-occultation signal real time simulation unit and controlled the output of five tunnel occultation signals and close, and has more dirigibility and authenticity.

(3) single many antennas of carrier occultation radiofrequency signal generation system provided by the invention, can form occultation parallel artificial network, the data simulation and the signal simulation function that realize many through star events, occultation event simultaneously, applicability is stronger, and the scope of application is more extensive.

Accompanying drawing explanation

Fig. 1 is system construction drawing of the present invention;

Fig. 2 is three rank totalizer theory diagrams of carrier wave ring of the present invention and pseudo-code;

Fig. 3 is occultation parallel signal generating network structured flowchart of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the invention is described further.

As shown in Figure 1, a kind of single many antennas of carrier occultation signal generating system can simulate through star passage, neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage and passage Zhe Wu road, backward ionosphere radiofrequency signal simultaneously; Native system comprises: the through real-time generation unit of star-occultation data, the through real-time generation unit of star-occultation signal, control computing machine and occultation constellation simulation unit;

Occultation constellation simulation unit is transferred to the real-time productive unit of through star-occultation data by the observation data of the through star generating, occultation by reflective memory network interface card and carries out data processing;

The through real-time generation unit of star-occultation data is according to the steering order (setting according to user's request) of the observation data of occultation constellation analogue system input and control calculating, generate in real time cumulative parameter and the power control code of through star and occultation, and send it to the real-time generation unit of through star-occultation signal; Described cumulative parameter comprises pseudo-code ring parameter and carrier wave ring parameter;

The through real-time generation unit of star-occultation signal, according to unified clock signal, utilizes cumulative parameter and the power control code of through star and Observation of Occultation data to generate five tunnel radiofrequency signals, and Bing Jiang five tunnel radiofrequency signals are sent to tested occultation and receive load system; Described Wu road radio frequency signal channels comprises through star passage, neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage, backward ionosphere passage.

The through real-time generation unit of star-occultation data ", " the through real-time generation unit of star-occultation signal " all adopt real time operating system, in conjunction with high-performance single board computer, guaranteed calculated performance that system is good and the response time of hard real time.

The through real-time generation unit of star-occultation data

The through real-time generation unit of star-occultation data comprises main control module, high-performance treatments module, gigabit ethernet card and reflective memory network interface card;

Main control module receives from the steering order of controlling computing machine by gigabit ethernet card, and according to steering order realize the through real-time generation unit of star-occultation data overall control (overall control comprise signal generate start, stop, the control such as modulation system);

The observation data from occultation constellation simulation unit that the utilization of high-performance treatments module is received by Reflective memory network clamping, and utilize observation data to generate pseudo-code ring parameter, carrier wave ring parameter and power control code, by optical fiber, be sent to the real-time generation unit of through star-occultation signal;

(a) computing method of pseudo-code ring parameter and carrier wave ring parameter as shown in Figure 2:

$k_0=K_0\&times;2^{M_0}$

$k_1=2^{C_1}\&times;(K_1+\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}{2}+\frac{K_3}{6})\&times;2^{M_0}$

${\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">k</figure-callout>}}_2=2^{C_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}\&times;({\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">K</figure-callout>}}_2+K_3)\&times;2^{M_1}$

$k_3=2^{C_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">C</figure-callout>}}_2}\&times;K_3\&times;2^{M_2}---\left(1\right)$

Wherein, k ₀, k ₁, k ₂and k ₃for pseudo-code ring or carrier wave ring parameter, C ₁and C ₂for blocking figure place, M ₀, M ₁and M ₂for the bit wide of pseudo-code three rank totalizers, for the calculating of pseudo-code ring parameter and carrier wave ring, C ₁, C ₂, M ₀, M ₁and M ₂value is different, and (computing method of pseudo-code ring parameter and carrier wave ring are identical, because C ₁, C ₂, M ₀, M ₁and M ₂value difference has caused result difference); K ₀, K ₁, K ₂and K ₃for intermediate variable:

$K_0=\frac{R_0}{c},K_1=\frac{v}{{\mathrm{cf}}_s},{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">K</figure-callout>}}_2=\frac{a}{{{\mathrm{<figure-callout\; id="2"\; label="cf\; s"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">cf</figure-callout>}}_s}^2},K_3=\frac{b}{{{\mathrm{cf}}_s}^3}---\left(2\right)$

R ₀be pseudorange initial value, v receives the radial velocity of load system for through star-occultation to tested occultation, and a receives the acceleration of load system for through star-occultation to tested occultation, and b receives the acceleration of load system for through star-occultation to tested occultation, and c is the light velocity, f _sfor sample frequency;

Block figure place C ₁and C ₂computing method:

$C_1={\log }_2\left(\frac{\mathrm{\&Delta;v}\&CenterDot;f_s}{\mathrm{\&Delta;a}}\right),{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">C</figure-callout>}}_2={\log }_2\left(\frac{\mathrm{\&Delta;a}\&CenterDot;f_s}{\mathrm{\&Delta;b}}\right)---\left(3\right)$

Δ v is velocity resolution, and Δ a is acceleration resolution, and Δ b is acceleration resolution.

M ₀, M ₁and M ₂for the bit wide of pseudo-code three rank totalizers, and have

$M_0={\log }_2\left(\frac{c\&CenterDot;f_s}{\mathrm{\&Delta;v}\&CenterDot;f_m}\right),M_1={\log }_2\left(\frac{v_{\max }\&CenterDot;f_s}{\mathrm{\&Delta;a}}\right),{\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="HDA0000416360940000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_2={\log }_2\left(\frac{a_{\max }\&CenterDot;f_s}{\mathrm{\&Delta;b}}\right)---\left(4\right)$

V _maxspeed maximal value, a _maxacceleration maximal value, f _mbe pseudo-code clock frequency (when calculating pseudo-code ring parameter, f _mpseudo-bit rate; When calculating carrier wave ring parameter, f _mcarrier frequency), Δ v, Δ a, Δ b, v _max, a _maxand f _mit is the preset value of described occultation radiofrequency signal generation system.

Generally, the truncation error of pseudo-code ring totalizer or carrier wave ring totalizer is embodied in single order totalizer parameter k ₁upper, so to pseudo-code ring parameter or carrier wave ring parameter k ₁correction, its correction amount k computing formula is:

$\mathrm{\&Delta;k}=\frac{k_0-{k_0}^{/}}{\mathrm{\&tau;}}---\left(5\right)$

K wherein ₀for the zeroth order totalizer parameter that current time calculates from through star-Observation of Occultation data, k ₀ ^/for the upper one zeroth order totalizer parameter constantly calculating from through star-Observation of Occultation data, revised pseudorange single order totalizer parameter expression is as follows:

${k_1}^{/}=k_1+\mathrm{\&Delta;k}---\left(6\right)$

(b) computing method of power control code:

$K=K_A\&CenterDot;\sqrt{\frac{P_s+K_{\mathrm{sv}\_r}-3}{P_{s0}}}\&CenterDot;\frac{1}{N}---\left(7\right)$

Wherein, K is power control code, K _acontrol code while being emulation single channel during power maximal value, P _sthe performance number in observation data, K _{sv_r}be emulation passage number modifying factor, N is emulation total number of channels, P _s0it is the minimum of power in observation data.

The through real-time generation unit of star-occultation signal

The straight real-time generation unit of described through star-occultation signal comprise data broadcast control module, through star navigation baseband module, forward direction occultation navigation baseband module, backward occultation navigation baseband module, time frequency module and radio-frequency module;

Data are broadcast control module according to controlling the generation of through star navigation baseband signal, forward and backward occultation baseband signal from the steering order of controlling computing machine and being exported by through star passage, ionosphere passage and person's neutral atmosphere passage;

Through star navigation baseband module, navigation forward baseband module and rear navigation baseband module receive respectively the through star that the real-time generation unit of through star-occultation data sends, the cumulative parameter of forward and backward occultation and power control code, and according to cumulative calculation of parameter, obtain the phase place of carrier wave meter and code table, according to the phase place of the code table calculating, in pseudo-code code table and carrier wave meter, table look-up and obtain carrier wave and pseudo-code, then utilize the carrier wave and the pseudo-code that obtain to modulate, filtering, close road, and multiply each other and carry out power adjustment and obtain through star and forward direction with power control code, the digital medium-frequency signal of backward occultation,

Time frequency module be used to the real-time generation unit of through star-occultation signal that unified clock signal is provided;

Radio-frequency module is used for the digital medium-frequency signal of through star to be carried out up-conversion, the digital medium-frequency signal of forward direction occultation is carried out to up-conversion, the digital medium-frequency signal of backward occultation is carried out to up-conversion by backward neutral atmosphere passage, backward ionosphere passage by neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage by through star passage, and up-conversion Hou five road signals are sent to tested occultation reception load system.

Occultation signal source parallel generation network

According to single many antennas of carrier occultation signal generating system, can further form occultation signal source parallel generation network.This artificial network forms (being single many antennas of carrier occultation signal generating system) by a control computing machine and some GNSS occultation signal simulators.As shown in Figure 3, control computing machine and control single many antennas of carrier occultation signal generating system by Ethernet.Every GNSS occultation signal simulator is exported 5 tunnel radiofrequency signals, is respectively through star passage, neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage, backward ionosphere passage.Between each GNSS occultation signal simulator, by optical fiber, be connected with outside occultation constellation analogue system, receive occultation constellation point bit data.

The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.

Claims (3)

1. single many antennas of carrier occultation signal generating system, can simulate through star passage, neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage and passage Zhe Wu road, backward ionosphere radiofrequency signal simultaneously, it is characterized in that comprising: the through real-time generation unit of star-occultation data, the through real-time generation unit of star-occultation signal, control computing machine and occultation constellation simulation unit;

Described occultation constellation simulation unit is transferred to the real-time productive unit of through star-occultation data by the observation data of the through star generating, occultation by reflective memory network interface card and carries out data processing;

The real-time generation unit of described through star-occultation data is according to the observation data of occultation constellation analogue system input and control the steering order of calculating, generate in real time cumulative parameter and the power control code of through star and occultation, and send it to the real-time generation unit of through star-occultation signal; Described cumulative parameter comprises pseudo-code ring parameter and carrier wave ring parameter;

The real-time generation unit of described through star-occultation signal, according to unified clock signal, utilizes cumulative parameter and the power control code of through star and Observation of Occultation data to generate five tunnel radiofrequency signals, and Bing Jiang five tunnel radiofrequency signals are sent to tested occultation and receive load system; Described Wu road radio frequency signal channels comprises through star passage, neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage, backward neutral atmosphere passage and backward ionosphere passage.

2. a kind of single many antennas of carrier occultation signal generating system according to claim 1, is characterized in that: the real-time generation unit of described through star-occultation data comprises main control module, high-performance treatments module, gigabit ethernet card and reflective memory network interface card;

Main control module receives from the steering order of controlling computing machine by gigabit ethernet card, and according to steering order, realizes the overall control of the through real-time generation unit of star-occultation data;

The observation data from occultation constellation simulation unit that the utilization of high-performance treatments module is received by Reflective memory network clamping, and utilize observation data to generate pseudo-code ring parameter, carrier wave ring parameter and power control code, by optical fiber, be sent to the real-time generation unit of through star-occultation signal;

The described method of utilizing observation data generation pseudo-code ring parameter, carrier wave ring parameter and power control code is as follows:

(a) computing method of pseudo-code ring parameter and carrier wave ring parameter:

$k_0=K_0\&times;2^{M_0}$

$k_1=2^{C_1}\&times;(K_1+\frac{K_2}{2}+\frac{K_3}{6})\&times;2^{M_0}$

$k_2=2^{C_1+C_2}\&times;(K_2+K_3)\&times;2^{M_1}$

$k_3=2^{C_1+C_2}\&times;K_3\&times;2^{M_2}$

Wherein, k ₀, k ₁, k ₂and k ₃for pseudo-code ring or carrier wave ring parameter, C ₁and C ₂for blocking figure place, M ₀, M ₁and M ₂for the bit wide of pseudo-code three rank totalizers, for the calculating of pseudo-code ring parameter and carrier wave ring, C ₁, C ₂, M ₀, M ₁and M ₂value is different; K ₀, K ₁, K ₂and K ₃for intermediate variable:

$K_0=\frac{R_0}{c},K_1=\frac{v}{{\mathrm{cf}}_s},K_2=\frac{a}{{{\mathrm{cf}}_s}^2},K_3=\frac{b}{{{\mathrm{cf}}_s}^3}$

R ₀it is pseudorange initial value, v arrives for the star-occultation of going directly the radial velocity that tested occultation receives load system, and a is the radial acceleration that tested occultation reception load system is arrived in through star-occultation, and b is the radially acceleration of star-occultation to tested occultation reception load system that go directly, c is the light velocity, f _sfor sample frequency;

(b) computing method of power control code:

$K=K_A\&CenterDot;\sqrt{\frac{P_s+K_{\mathrm{sv}\_r}-3}{P_{s0}}}\&CenterDot;\frac{1}{N}$

Wherein, K is power control code, K _acontrol code while being emulation single channel during power maximal value, P _sthe performance number in observation data, K _{sv_r}be emulation passage number modifying factor, N is emulation total number of channels, P _s0it is the minimum of power in observation data.

3. a kind of single many antennas of carrier occultation signal generating system according to claim 1, is characterized in that: the real-time generation unit of described through star-occultation signal comprise data broadcast control module, through star navigation baseband module, forward direction occultation navigation baseband module, backward occultation navigation baseband module, time frequency module and radio-frequency module;

Data are broadcast control module according to controlling the generation of through star navigation baseband signal, forward and backward occultation baseband signal from the steering order of controlling computing machine and being exported by through star passage, ionosphere passage and person's neutral atmosphere passage;

Through star navigation baseband module, navigation forward baseband module and rear navigation baseband module receive respectively the through star that the real-time generation unit of through star-occultation data sends, the cumulative parameter of forward and backward occultation and power control code, and according to cumulative calculation of parameter, obtain the phase place of carrier wave meter and code table, according to the phase place of the code table calculating, in pseudo-code code table and carrier wave meter, table look-up and obtain carrier wave and pseudo-code, then utilize the carrier wave and the pseudo-code that obtain to modulate, filtering, close road, and multiply each other and carry out power adjustment and obtain through star and forward direction with power control code, the digital medium-frequency signal of backward occultation,

Time frequency module be used to the real-time generation unit of through star-occultation signal that unified clock signal is provided;

Radio-frequency module is used for the digital medium-frequency signal of through star to be carried out up-conversion, the digital medium-frequency signal of forward direction occultation is carried out to up-conversion, the digital medium-frequency signal of backward occultation is carried out to up-conversion by backward neutral atmosphere passage, backward ionosphere passage by neutroclusion with anteroversion plasmas channel, forward direction ionosphere passage by through star passage, and up-conversion Hou five road signals are sent to tested occultation reception load system.

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