阅读说明：本技术 一种弹间接收机实时交互的差分定位系统 (Differential positioning system for real-time interaction of missile-borne receiver ) 是由 曹兢 张瑞鹏 李强 宋明 金文� 刘志轩 宋蔚阳 王晓飞 闫新峰 刘佳琪 沈翛然 于 2020-11-23 设计创作，主要内容包括：一种弹间接收机实时交互的差分定位系统,包括：两个飞行器、导航卫星；两个飞行器各有装有一台卫星导航接收机；两台卫星导航接收机分别实时接收多个导航卫星的导航信号,从各个导航卫星的导航信号中提取伪距观测量；实现两台接收机对相同导航卫星的伪距观测量一次差分,消除伪距观测量和伪距观测量中的卫星钟差和部分大气延时误差；实现两台接收机对不同导航卫星的伪距观测量二次差分,消除第2个导航卫星的伪距单差值至第N个导航卫星的伪距单差值中的接收机钟差；接收机1和接收机2,均对第2个导航卫星的伪距双差值至第N个导航卫星的伪距双差值,运用最小二乘法,解算出接收机1和接收机2之间的相对距离,实现两个飞行器高精度的相对定位。(A differential positioning system for real-time interaction of missile-borne receivers comprises: two aircrafts, a navigation satellite; two aircrafts are respectively provided with a satellite navigation receiver; the two satellite navigation receivers respectively receive the navigation signals of a plurality of navigation satellites in real time and extract pseudo-range observed quantities from the navigation signals of the navigation satellites; realizing the primary difference of pseudo-range observed quantities of two receivers to the same navigation satellite and eliminating the pseudo-range observed quantities And pseudorange observations The clock error of the satellite and the delay error of partial atmosphere; realizing the secondary difference of pseudo-range observed quantities of two receivers to different navigation satellites, and eliminating the pseudo-range single difference value of the 2 nd navigation satellite to the Nth navigation satelliteReceiver clock error in the pseudorange single difference values of the satellites; the receiver 1 and the receiver 2 both solve the relative distance between the receiver 1 and the receiver 2 by using a least square method for the pseudo-range double difference value of the 2 nd navigation satellite to the pseudo-range double difference value of the Nth navigation satellite, thereby realizing high-precision relative positioning of the two aircrafts.)

1. A differential positioning system for real-time interaction of a missile-borne receiver is characterized by comprising: two aircrafts, a navigation satellite;

the two aircrafts are respectively provided with a satellite navigation receiver which is respectively marked as a receiver 1 and a receiver 2;

the two satellite navigation receivers respectively receive the navigation signals of a plurality of navigation satellites in real time and extract pseudo-range observed quantities from the navigation signals of the navigation satellites;

the pseudo-range observed quantity of the satellite i extracted by the receiver 1 is a pseudo-range observed quantity P₁ ⁱ(ii) a The pseudo-range observed quantity of the satellite i extracted by the receiver 2 is a pseudo-range observed quantityi is 1, … and N; n is the number of navigation satellites

The two aircrafts are provided with communication modules; the real-time mutual transmission of pseudo-range observed quantities of all navigation satellites extracted by the receiver can be realized, and the pseudo-range observed quantities are transmitted to the receiver 1 and the receiver 2; enabling satellite navigation receivers of two aircraft to simultaneously obtain real-time pseudorange observations P₁ ⁱAnd pseudorange observations

Receiver 1 and receiver 2, each based on pseudorange observations P from satellite i₁ ⁱAnd pseudorange observationsPerforming single difference calculation to obtain pseudo range single difference value of satellite iTraversing all the values of i to obtain pseudo range single difference values of N navigation satellites; realizing the primary difference of pseudo-range observed quantities of two receivers to the same navigation satellite and eliminating the pseudo-range observed quantity P₁ ⁱAnd pseudorange observationsThe clock error of the satellite and the delay error of partial atmosphere;

receiver 1 and receiver 2, each based on a single difference of pseudoranges from N navigation satellitesRespectively differentiating the pseudo range single difference value of the 1 st navigation satellite to obtain N-1 differential resultsi, taking 2, … and N as the pseudo-range double difference value from the 2 nd navigation satellite to the Nth navigation satellite; realizing the secondary difference of pseudo-range observed quantities of two receivers to different navigation satellites and eliminating the pseudo-range single difference value of the 2 nd navigation satelliteSingle delta pseudorange to nth navigation satelliteThe receiver clock error in;

the receiver 1 and the receiver 2 both solve the relative distance between the receiver 1 and the receiver 2 by using a least square method for the pseudo-range double difference value of the 2 nd navigation satellite to the pseudo-range double difference value of the Nth navigation satellite, thereby realizing high-precision relative positioning of the two aircrafts.

2. The differential positioning system for real-time interaction of the missile-borne receiver according to claim 1, wherein the differential positioning system comprises: the flight area of the aircrafts is wide, no buildings are shielded, and the aircrafts need to be relatively positioned with high precision within 1 meter.

3. The differential positioning system for real-time interaction of the missile-borne receiver according to claim 1, wherein the differential positioning system comprises: the satellite navigation receiver may simultaneously receive signals from multiple navigation satellites.

4. The differential positioning system for real-time interaction of the missile-borne receiver according to claim 1, wherein the differential positioning system comprises: the satellite navigation receiver is compatible with satellite signals of GPS, Beidou No. two, Beidou No. three, GLONASS and other systems, and the signals are civil signals.

5. The differential positioning system for real-time interaction of the missile-borne receiver according to claim 1, wherein the differential positioning system comprises: the two aircrafts are provided with communication modules, data such as pseudo-range observed quantities and the like are framed according to a certain protocol requirement, and real-time mutual transmission of the pseudo-range observed quantities of the navigation satellites extracted by the satellite navigation receiver can be realized at a time interval of 100 ms.

6. A differential positioning method for real-time interaction of a missile-borne receiver is characterized by comprising the following steps:

(1) two aircrafts are respectively provided with a satellite navigation receiver which is respectively marked as a receiver 1 and a receiver 2;

(2) the two satellite navigation receivers respectively receive the navigation signals of a plurality of navigation satellites in real time and extract pseudo-range observed quantities from the navigation signals of the navigation satellites; the pseudo-range observed quantity of the satellite i extracted by the receiver 1 is a pseudo-range observed quantity P₁ ⁱ(ii) a The pseudo-range observed quantity of the satellite i extracted by the receiver 2 is a pseudo-range observed quantityi is 1, … and N; n is the number of navigation satellites

(3) The two aircrafts are provided with communication modules, so that the pseudo-range observed quantities of all the navigation satellites extracted by the receiver are mutually transmitted in real time and are transmitted to the receiver 1 and the receiver 2; enabling satellite navigation receivers of two aircraft to simultaneously obtain real-time pseudorange observations P₁ ⁱAnd pseudorange observations

(4) Receiver 1 and receiver 2, each based on pseudorange observations P from satellite i₁ ⁱAnd pseudorange observationsPerforming single difference calculation to obtain pseudo range single difference value of satellite iTraversing all the values of i to obtain pseudo range single difference values of N navigation satellites; realizing the primary difference of pseudo-range observed quantities of two receivers to the same navigation satellite and eliminating the pseudo-range observed quantity P₁ ⁱAnd pseudorange observationsThe clock error of the satellite and the delay error of partial atmosphere;

(5) receiver 1 and receiver 2, each based on a single difference of pseudoranges from N navigation satellitesRespectively differentiating the pseudo range single difference value of the 1 st navigation satellite to obtain N-1 differential resultsi is 2, … and N, namely the pseudo range pair of the 2 nd navigation satelliteThe pseudo range from the difference value to the Nth navigation satellite is double-difference value; realizing the secondary difference of pseudo-range observed quantities of two receivers to different navigation satellites and eliminating the pseudo-range single difference value of the 2 nd navigation satelliteSingle delta pseudorange to nth navigation satelliteThe receiver clock error in;

(6) the receiver 1 and the receiver 2 both solve the relative distance between the receiver 1 and the receiver 2 by using a least square method for the pseudo-range double difference value of the 2 nd navigation satellite to the pseudo-range double difference value of the Nth navigation satellite, thereby realizing high-precision relative positioning of the two aircrafts.

7. The differential positioning method for real-time interaction of the missile-borne receiver according to claim 6, characterized in that: the flight area of the aircrafts is wide, no buildings are shielded, and the aircrafts need to be relatively positioned with high precision within 1 meter.

8. The differential positioning method for real-time interaction of the missile-borne receiver according to claim 6, characterized in that: the satellite navigation receiver may simultaneously receive signals from multiple navigation satellites.

9. The differential positioning method for real-time interaction of the missile-borne receiver according to claim 6, characterized in that: the satellite navigation receiver is compatible with satellite signals of GPS, Beidou No. two, Beidou No. three, GLONASS and other systems, and the signals are civil signals.

10. The differential positioning method for real-time interaction of the missile-borne receiver according to claim 6, characterized in that: the two aircrafts are provided with communication modules, data such as pseudo-range observed quantities and the like are framed according to a certain protocol requirement, and real-time mutual transmission of the pseudo-range observed quantities of the navigation satellites extracted by the satellite navigation receiver can be realized at a time interval of 100 ms.

Technical Field

The invention relates to a differential positioning system for real-time interaction of a missile-borne receiver, and belongs to the technical field of aircraft cooperative positioning and receiver differential positioning.

Background

With the severe war zone environment and the higher and higher relative positioning accuracy requirement among a plurality of aircrafts, most of the satellite navigation receiver single-point positioning based on the GNSS satellite navigation system has a positioning accuracy index of 10 meters, and the current positioning accuracy requirement cannot be met.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the differential positioning system for real-time interaction of the missile-borne receiver is a method which is wide in application and can effectively reduce or even eliminate various measurement errors, so that the differential positioning precision is obviously high, and the meter-class or even decimeter-class high-precision positioning between aircrafts is realized.

The technical scheme of the invention is as follows: a differential positioning system for real-time interaction of missile-borne receivers comprises: two aircrafts, a navigation satellite;

the two aircrafts are respectively provided with a satellite navigation receiver which is respectively marked as a receiver 1 and a receiver 2;

the two satellite navigation receivers respectively receive the navigation signals of a plurality of navigation satellites in real time and extract pseudo-range observed quantities from the navigation signals of the navigation satellites;

the pseudo-range observed quantity of the satellite i extracted by the receiver 1 is a pseudo-range observed quantity P₁ ⁱ(ii) a The pseudo-range observed quantity of the satellite i extracted by the receiver 2 is a pseudo-range observed quantityi is 1, … and N; n is the number of navigation satellites

The two aircrafts are provided with communication modules; the real-time mutual transmission of pseudo-range observed quantities of all navigation satellites extracted by the receiver can be realized, and the pseudo-range observed quantities are transmitted to the receiver 1 and the receiver 2; enabling satellite navigation receivers of two aircraft to simultaneously obtain real-time pseudorange observations P₁ ⁱAnd pseudorange observations

Receiver 1 and receiver 2, each based on pseudorange observations P from satellite i₁ ⁱAnd pseudorange observationsPerforming single difference calculation to obtain pseudo range single difference value of satellite iTraversing all the values of i to obtain pseudo range single difference values of N navigation satellites; realizing the primary difference of pseudo-range observed quantities of two receivers to the same navigation satellite and eliminating the pseudo-range observed quantity P₁ ⁱAnd pseudorange observationsThe clock error of the satellite and the delay error of partial atmosphere;

a receiver 1 and a receiver 2, which are,all according to the pseudo range single difference value of N navigation satellitesRespectively differentiating the pseudo range single difference value of the 1 st navigation satellite to obtain N-1 differential resultsi, taking 2, … and N as the pseudo-range double difference value from the 2 nd navigation satellite to the Nth navigation satellite; realizing the secondary difference of pseudo-range observed quantities of two receivers to different navigation satellites and eliminating the pseudo-range single difference value of the 2 nd navigation satelliteSingle delta pseudorange to nth navigation satelliteThe receiver clock error in;

the receiver 1 and the receiver 2 both solve the relative distance between the receiver 1 and the receiver 2 by using a least square method for the pseudo-range double difference value of the 2 nd navigation satellite to the pseudo-range double difference value of the Nth navigation satellite, thereby realizing high-precision relative positioning of the two aircrafts.

Preferably, the flight area of the aircrafts is wide, no buildings are shielded, and high-precision relative positioning within 1 meter is needed between the aircrafts.

Preferably, the satellite navigation receiver can simultaneously receive signals of a plurality of navigation satellites.

Preferably, the satellite navigation receiver is compatible with satellite signals of GPS, Beidou No. two, Beidou No. three, GLONASS and other systems, and the signals are civil signals.

Preferably, the two aircrafts are provided with communication modules, and data such as pseudo-range observed quantities are framed according to a certain protocol requirement, so that real-time mutual transmission of the pseudo-range observed quantities of the navigation satellites extracted by the satellite navigation receiver can be realized at a time interval of 100 ms.

A differential positioning method for real-time interaction of a missile-borne receiver comprises the following steps:

(1) two aircrafts are respectively provided with a satellite navigation receiver which is respectively marked as a receiver 1 and a receiver 2;

(2) the two satellite navigation receivers respectively receive the navigation signals of a plurality of navigation satellites in real time and extract pseudo-range observed quantities from the navigation signals of the navigation satellites; the pseudo-range observed quantity of the satellite i extracted by the receiver 1 is a pseudo-range observed quantity P₁ ⁱ(ii) a The pseudo-range observed quantity of the satellite i extracted by the receiver 2 is a pseudo-range observed quantityi is 1, … and N; n is the number of navigation satellites

(3) The two aircrafts are provided with communication modules, so that the pseudo-range observed quantities of all the navigation satellites extracted by the receiver are mutually transmitted in real time and are transmitted to the receiver 1 and the receiver 2; enabling satellite navigation receivers of two aircraft to simultaneously obtain real-time pseudorange observations P₁ ⁱAnd pseudorange observations

(4) Receiver 1 and receiver 2, each based on pseudorange observations P from satellite i₁ ⁱAnd pseudorange observationsPerforming single difference calculation to obtain pseudo range single difference value of satellite iTraversing all the values of i to obtain pseudo range single difference values of N navigation satellites; realizing the primary difference of pseudo-range observed quantities of two receivers to the same navigation satellite and eliminating the pseudo-range observed quantity P₁ ⁱAnd pseudorange observationsThe clock error of the satellite and the delay error of partial atmosphere;

(5) receiver 1 and receiver 2, each based on a single difference of pseudoranges from N navigation satellitesRespectively differentiating the pseudo range single difference value of the 1 st navigation satellite to obtain N-1 differential resultsi, taking 2, … and N as the pseudo-range double difference value from the 2 nd navigation satellite to the Nth navigation satellite; realizing the secondary difference of pseudo-range observed quantities of two receivers to different navigation satellites and eliminating the pseudo-range single difference value of the 2 nd navigation satelliteSingle delta pseudorange to nth navigation satelliteThe receiver clock error in;

(6) the receiver 1 and the receiver 2 both solve the relative distance between the receiver 1 and the receiver 2 by using a least square method for the pseudo-range double difference value of the 2 nd navigation satellite to the pseudo-range double difference value of the Nth navigation satellite, thereby realizing high-precision relative positioning of the two aircrafts.

Preferably, the flight area of the aircrafts is wide, no buildings are shielded, and high-precision relative positioning within 1 meter is needed between the aircrafts.

Preferably, the satellite navigation receiver can simultaneously receive signals of a plurality of navigation satellites.

Preferably, the satellite navigation receiver is compatible with satellite signals of GPS, Beidou No. two, Beidou No. three, GLONASS and other systems, and the signals are civil signals.

Preferably, the two aircrafts are provided with communication modules, and data such as pseudo-range observed quantities are framed according to a certain protocol requirement, so that real-time mutual transmission of the pseudo-range observed quantities of the navigation satellites extracted by the satellite navigation receiver can be realized at a time interval of 100 ms.

Compared with the prior art, the invention has the advantages that:

(1) the invention aims at the aircrafts with high-precision positioning requirements, and the inter-missile high-precision positioning and navigation system based on GNSS differential positioning utilizes the satellite navigation receivers of a plurality of aircrafts to carry out real-time satellite pseudo-range observed quantity interaction and differential positioning, thereby realizing precise relative positioning or auxiliary high-precision position correction among the aircrafts and providing reliable position measurement data for guidance and control of the aircrafts.

(2) The positioning navigation system of the invention is a method which has wide application and can effectively reduce or even eliminate various measurement errors, so that the differential positioning precision is obviously higher than the single-point positioning precision, thereby realizing the meter-level or even decimeter-level high-precision positioning between aircrafts.

(3) The differential positioning system for the real-time interaction of the missile-borne receiver utilizes the pseudo-range observed quantity of the satellite navigation receiver to construct a differential model, can eliminate or offset most of clock errors, satellite ephemeris errors, ionosphere delay, troposphere delay and the like in the satellite positioning process, and accordingly obtains position and speed information with high positioning accuracy. The differential positioning system can complete real-time dynamic positioning, and can also be used as an auxiliary enhancement system to correct the positioning result of a receiver on an aircraft.

Drawings

FIG. 1 is a block diagram of a differential positioning system of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

The invention relates to a differential positioning system for real-time interaction of a missile-borne receiver, which comprises: two aircrafts, a navigation satellite; the two aircrafts are respectively provided with a satellite navigation receiver which is respectively marked as a receiver 1 and a receiver 2; the two satellite navigation receivers respectively receive the navigation signals of a plurality of navigation satellites in real time and extract pseudo-range observed quantities from the navigation signals of the navigation satellites; satellite i artifact extraction by receiver 1The range observations are pseudorange observations P₁ ⁱ(ii) a The pseudo-range observed quantity of the satellite i extracted by the receiver 2 is a pseudo-range observed quantityi is 1, … and N; n is the number of navigation satellites; the two aircrafts are provided with communication modules; the real-time mutual transmission of pseudo-range observed quantities of all navigation satellites extracted by the receiver can be realized, and the pseudo-range observed quantities are transmitted to the receiver 1 and the receiver 2; enabling satellite navigation receivers of two aircraft to simultaneously obtain real-time pseudorange observations P₁ ⁱAnd pseudorange observationsReceiver 1 and receiver 2, each based on pseudorange observations P from satellite i₁ ⁱAnd pseudorange observationsPerforming single differential calculation to obtain pseudo range single difference values of the satellite i, traversing all the values of the satellite i, and obtaining pseudo range single difference values of the N navigation satellites; realizing the primary difference of pseudo-range observed quantities of two receivers to the same navigation satellite and eliminating the pseudo-range observed quantity P₁ ⁱAnd pseudorange observationsThe clock error of the satellite and the delay error of partial atmosphere; the receiver 1 and the receiver 2 respectively carry out difference on the pseudo-range single difference value of the 1 st navigation satellite according to the pseudo-range single difference value of the 2 nd navigation satellite to the pseudo-range single difference value of the Nth navigation satellite in the pseudo-range single difference values of the N navigation satellites to obtain N-1 difference results, namely the pseudo-range double difference value of the 2 nd navigation satellite to the pseudo-range double difference value of the Nth navigation satellite; the secondary difference of pseudo-range observed quantities of different navigation satellites by the two receivers is realized, and the receiver clock error from the pseudo-range single difference value of the 2 nd navigation satellite to the pseudo-range single difference value of the Nth navigation satellite is eliminated; the receiver 1 and the receiver 2 solve the pseudo-range double difference value of the 2 nd navigation satellite to the pseudo-range double difference value of the Nth navigation satellite by using a least square method1 and a receiver 2, and realizes high-precision relative positioning of the two aircrafts.

The differential positioning system for real-time interaction of the missile-borne receiver, disclosed by the invention, is already applied to a collaborative flight test of two aircrafts, and can also provide real-time differential positioning service for more aircrafts in the future. By adopting the scheme of the invention, the relative positioning of 1 meter magnitude between the two aircrafts can be realized by receiving the GNSS satellite navigation signal, a technical basis is provided for high-precision cooperative networking based on satellite navigation positioning, and the auxiliary correction of positioning and fixed speed can be further provided for other aircrafts in a flight area.

The invention further prefers to do the following:

as shown in fig. 1, a differential positioning system for real-time interaction of a missile-borne receiver includes: two aircraft, navigation satellite signals;

the two aircrafts are respectively provided with a satellite navigation receiver which is respectively marked as a receiver 1 and a receiver 2;

the two satellite navigation receivers respectively receive the navigation signals of a plurality of navigation satellites in real time and extract pseudo-range observed quantities from the navigation signals of the navigation satellites; the preferred scheme is as follows:

the pseudo-range observed quantity of the satellite i extracted by the receiver 1 is a pseudo-range observed quantity P₁ ⁱ(ii) a The pseudo-range observed quantity of the satellite i extracted by the receiver 2 is a pseudo-range observed quantityi is 1, … and N; n is the number of navigation satellites

The two aircrafts are provided with communication modules; the real-time mutual transmission of pseudo-range observed quantities of all navigation satellites extracted by the receiver can be realized, and the pseudo-range observed quantities are transmitted to the receiver 1 and the receiver 2; enabling satellite navigation receivers of two aircraft to simultaneously obtain real-time pseudorange observations P₁ ⁱAnd pseudorange observationsThe preferred scheme is as follows:

wherein, P₁ ⁱRepresenting pseudorange observations, r, of the receiver 1₁ ⁱRepresenting the true geometric distance between the receiver 1 and the satellite i, c represents the speed of light, i.e. 3 x 10⁸m/s，δt_u,1Representing the receiver clock error, deltat, of the receiver 1ⁱRepresenting the satellite clock error of the ith satellite received by the receiver 1,indicating the ionospheric delay error, T, of the ith satellite received by the receiver 1₁ ⁱRepresenting the tropospheric delay error for the ith satellite received by the receiver 1.Represents pseudorange observations of the receiver 2,representing the true geometric distance between the receiver 2 and the satellite i, c represents the speed of light, i.e. 3 x 10⁸m/s，δt_u,2Representing the receiver clock difference, deltat, of the receiver 2ⁱRepresenting the satellite clock error of the ith satellite received by the receiver 2,indicating the ionospheric delay error of the ith satellite received by the receiver 2,representing the tropospheric delay error for the ith satellite received by the receiver 2.

Receiver 1 and receiver 2, each based on pseudorange observations P from satellite i₁ ⁱAnd pseudorange observationsPerforming single difference calculation to obtain pseudo range single difference value of satellite iTraversing all the values of i to obtain pseudo range single difference values of N navigation satellites; realizing the primary difference of pseudo-range observed quantities of two receivers to the same navigation satellite and eliminating the pseudo-range observed quantity P₁ ⁱAnd pseudorange observationsThe clock error of the satellite and the delay error of partial atmosphere; the preferred scheme is as follows:

wherein the content of the first and second substances,represents a single difference in pseudoranges to satellite i obtained by the satellite navigation receiver,a first order difference value representing the true geometric distance between the receiver 1 and the satellite i and the true geometric distance between the receiver 2 and the satellite i, and c represents the speed of light, i.e., 3 × 10⁸m/s，Δδt_u,12A first order differential value representing the receiver clock difference of the receiver 1 and the receiver clock difference of the receiver 2,a first order difference value representing the ionospheric delay error of satellite i received by the receiver 1 and the ionospheric delay error of satellite i received by the receiver 2,representing the first order differential value of the tropospheric delay error of satellite i received by receiver 1 and the tropospheric delay error of the ith satellite received by receiver 2. Is connected withSatellite clock difference deltat of satellite i received by receiver 1ⁱEqual to the satellite clock difference deltat of the satellite i received by the receiver 2ⁱTherefore, the satellite clock difference deltat in the pseudo-range observed quantity can be eliminated by once differentiating the pseudo-range observed quantity of the same navigation satellite by the two satellite navigation receiversⁱAnd partial atmospheric delay (atmospheric delay contains ionospheric delay and tropospheric delay) errors.

The receiver 1 and the receiver 2 respectively perform the pseudo-range single difference value of the 1 st navigation satellite according to the pseudo-range single difference value of the 2 nd navigation satellite to the pseudo-range single difference value of the Nth navigation satellite in the pseudo-range single difference values of the N navigation satellitesCarrying out difference to obtain N-1 difference results, namely the pseudo range double difference value from the 2 nd navigation satellite to the N navigation satelliteTaking 2, … and N as the i; the secondary difference of pseudo-range observed quantities of different navigation satellites by the two receivers is realized, and the receiver clock error from the pseudo-range single difference value of the 2 nd navigation satellite to the pseudo-range single difference value of the Nth navigation satellite is eliminated; the preferred scheme is as follows:

wherein the content of the first and second substances,representing the double difference of the pseudoranges of the navigation satellite i, i takes 2, …, N,representing the first order differential value of the true geometric distance of the receiver 1 from the satellite i and the true geometric distance of the receiver 2 from the satellite i,representing the true geometric distance of the receiver 1 from the satellite 1 and the receiver2, c represents the speed of light, i.e. 3 × 10⁸m/s，Δδt_u,12A first order differential value representing the receiver clock difference of the receiver 1 and the receiver clock difference of the receiver 2,a first order difference value representing the ionospheric delay error of satellite i received by the receiver 1 and the ionospheric delay error of satellite i received by the receiver 2,a first order difference value representing the tropospheric delay error of satellite i received by receiver 1 and the tropospheric delay error of satellite i received by receiver 2;representing the second order difference values of the geometrical distances of the receiver 1 and the receiver 2 to the satellite 1 and the satellite i,represents the ionospheric delay error second order difference values of satellite 1 and satellite i received by receiver 1 and receiver 2,representing a second-order difference value of tropospheric delay errors of the satellite 1 and the satellite i received by the receiver 1 and the receiver 2; Δ δ t_u,12The first differential value, which represents the receiver clock offset of receiver 1 and the receiver clock offset of receiver 2, is cancelled out in the second differential process, so this process eliminates the receiver clock offset from the pseudorange single difference for the 2 nd navigation satellite to the pseudorange single difference for the nth navigation satellite.

The receiver 1 and the receiver 2 both solve the relative distance between the receiver 1 and the receiver 2 by using a least square method for the pseudo-range double difference value of the 2 nd navigation satellite to the pseudo-range double difference value of the Nth navigation satellite, thereby realizing high-precision relative positioning of the two aircrafts. The preferred scheme is as follows:

defining the three-dimensional distance between the receiver 1 and the receiver 2 asBase line vector b₁₂，A first order difference value representing the true geometric distance of the receiver 1 from the satellite i and the true geometric distance of the receiver 2 from the satellite i, which have the following relationship:

wherein the content of the first and second substances,representing a unit observation direction vector of the satellite i at the satellite navigation receiver 2,a transpose matrix representing a unit observation direction vector of the satellite i at the satellite navigation receiver 2.

Due to second order difference value of pseudo range observation quantitySatellite clock error in pseudo range observation amount, receiver clock error in pseudo range single difference value and most of ionospheric delay and tropospheric delay errors are eliminated, and the residual ionospheric delay error second-order difference value(Indicating the ionospheric delay error second order difference value between satellite 1 and satellite i received by receiver 1 and receiver 2), the tropospheric delay error second order difference value(Indicating the satellites received by receiver 1 and receiver 21 and the tropospheric delay error second order differential value of satellite i) are small and can be ignored, so the following baseline vector observation equation can be obtained:

wherein the content of the first and second substances,representing the double difference of the pseudoranges of the navigation satellites 2,representing the double difference of the pseudoranges of the navigation satellite i,representing the second order difference value of the geometric distances between the receiver 1 and the receiver 2 and between the satellite 1 and the satellite 2,representing the second order difference values of the geometrical distances of the receiver 1 and the receiver 2 to the satellite 1 and the satellite i,represents the ionospheric delay error second order difference values of satellite 1 and satellite 2 received by receiver 1 and receiver 2,represents the ionospheric delay error second order difference values of satellite 1 and satellite i received by receiver 1 and receiver 2,represents the second difference of tropospheric delay errors of satellite 1 and satellite 2 received by receiver 1 and receiver 2,represents the second order difference value of the tropospheric delay errors of satellite 1 and satellite i received by receiver 1 and receiver 2,representing a unit observation direction vector of the satellite 2 at the satellite navigation receiver 2,representing the unit direction vector of observation of the satellite i at the satellite navigation receiver 2, b₁₂Representing the three-dimensional distance between receiver 1 and receiver 2, i.e. the baseline vector. From the baseline vector observation equation, a three-dimensional distance vector b between the receiver 1 and the receiver 2 can be solved₁₂The relative positioning of the receiver 1 and the receiver 2 is achieved.

The invention relates to a differential positioning system for real-time interaction of a missile-borne receiver, which can eliminate the following error items in pseudo-range observed quantity acquired by a satellite navigation receiver:

(1) satellite clock error 2.4m

(2) Satellite ephemeris error 2.4m

(3) Ionospheric delay error of 3.0m

(4) Tropospheric delay error 0.4m

The magnitude of the residual ionospheric delay error secondary differential value and tropospheric delay error secondary differential value can be ignored, and finally the relative positioning accuracy of 1 meter or even decimeter magnitude between the two aircrafts can be realized.

The invention aims at aircrafts with high-precision positioning requirements, and the inter-missile high-precision positioning and navigation system based on GNSS differential positioning utilizes satellite navigation receivers of a plurality of aircrafts to carry out real-time satellite pseudo-range observed quantity interaction and differential positioning, thereby realizing precise relative positioning or auxiliary high-precision position correction among the aircrafts and providing reliable position measurement data for guidance and control of the aircrafts.

The differential positioning system for the real-time interaction of the missile-borne receiver utilizes the pseudo-range observed quantity of the satellite navigation receiver to construct a differential model, can eliminate or offset most of clock errors, satellite ephemeris errors, ionosphere delay, troposphere delay and the like in the satellite positioning process, and accordingly obtains position and speed information with high positioning accuracy. The differential positioning system can complete real-time dynamic positioning, and can also be used as an auxiliary enhancement system to correct the positioning result of a receiver on an aircraft.