阅读说明：本技术 一种在导航/通信一体化中提升导频信号检测性能的方法 (Method for improving pilot signal detection performance in navigation/communication integration ) 是由 李欣玥 邹德岳 刘鑫 赵楠 于 2020-03-26 设计创作，主要内容包括：一种在导航/通信一体化中提升导频信号检测性能的方法。首先,令长度为N的信号D与本地信号P做相关运算,相关运算后的互相关函数值存放在数组Q中。其次,设定一门限值<Image he="141" wi="383" file="DDA0002426703860000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>找出Q中大于K的元素并将其对应在数组中的位置序号记为数组Z,找出Q中小于-K的元素并将其对应在数组中的位置序号记为数组F。最后,当导频信号发送数据比特1时,将数据信道上发送的信号D循环移位k位,构成CCSK信号作为数据信号,其中k的取值从Z中选取；当导频信号发送数据比特0时,将数据信道上发送的信号D循环移位k位,构成CCSK信号作为数据信号,其中k的取值从F中选取。本发明选取数据信号的循环移位次数,使得导频信号正/负的自相关峰值恰好与数据信号正/负的互相关峰值叠加,能够减少数据信道对导频信道的互相关干扰。(A method for improving pilot signal detection performance in navigation/communication integration. Firstly, a signal D with the length of N and a local signal P are subjected to correlation operation, and a cross-correlation function value after the correlation operation is stored in an array Q. Next, a threshold value is set)

1. A method for improving pilot signal detection performance in navigation/communication integration is characterized by comprising the following steps:

step 1, performing correlation operation on a signal D with the length of N and a local signal P; wherein N is the length of the pseudo-random sequence, the signal D is sent by a data channel, the signal P is sent by a pilot channel, and D and P are composed of pseudo-random sequences of different codes of the same family;

step 2, the array Q stores the cross-correlation function value after the correlation operation;

step 3, setting a threshold valueα is a positive real number greater than 1 and K is less than or equal to max (Q) in order to make the selected cyclic shift times have practical significance, wherein i is the position serial number of the array elements;

step 4, finding out elements which are larger than K in Q, recording the position serial numbers of the elements which are corresponding to the elements in the array as an array Z, finding out elements which are smaller than-K in Q, and recording the position serial numbers of the elements which are corresponding to the elements in the array as an array F; wherein the position serial number is the corresponding cyclic shift times;

step 5, when the pilot signal sends data bit 1, namely the pilot channel sends sequence P, the signal D sent on the data channel is circularly shifted by k bits to form CCSK signal as data signal, wherein the value of k is selected from the elements in Z; when the pilot signal transmits data bit 0, that is, when the pilot channel transmits sequence-P, the signal D transmitted on the data channel is cyclically shifted by k bits to form a CCSK signal as the data signal, where the value of k is selected from the elements in F.

Technical Field

The invention belongs to the technical field of wireless communication, relates to navigation/communication integration, and particularly relates to a method for improving pilot signal detection performance in the navigation/communication integration.

Background

In the navigation/communication integrated design based on Cyclic Code Shift Keying (CCSK), a pilot signal and a data signal are superimposed and transmitted, wherein the data signal is modulated by the CCSK technology. The cross-correlation interference of the data channel to the pilot channel degrades the detection performance of the pilot channel, thereby affecting the detection performance. Compared with the prior art, the method has the advantages that the cyclic shift times of the data signal are selected, so that the positive/negative autocorrelation peak value of the pilot signal is just superposed on the positive/negative cross correlation peak value of the data signal, and the detection performance of the pilot channel is improved.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the cross-correlation interference of the data channel to the pilot channel degrades the detection performance of the pilot channel. The invention aims to ensure that the positive/negative autocorrelation peak value of the pilot signal is just superposed with the positive/negative cross-correlation peak value of the data signal by selecting the bit number of the data signal shift, thereby enhancing the detection performance of the pilot channel.

In order to achieve the purpose, the invention adopts the technical scheme that:

a method for improving pilot signal detection performance in navigation/communication integration comprises the following steps:

step 1, making the signal D with the length of N and the local signal P to do correlation operation. Where N is the length of the pseudorandom sequence, signal D is sent by the data channel, signal P is sent by the pilot channel, and D and P are composed of pseudorandom sequences of different codes of the same family.

And 2, storing the cross-correlation function value after the correlation operation by the array Q.

Step 3, setting a threshold valueα is a positive real number greater than 1 and K ≦ max (Q) in order to make the selected number of cyclic shifts practical, where i is the position number of the array element.

And 4, finding out elements which are larger than K in Q, recording the position serial numbers of the elements corresponding to the elements in the array as an array Z, finding out elements which are smaller than-K in Q, and recording the position serial numbers of the elements corresponding to the elements in the array as an array F. Wherein the position sequence number is the corresponding cyclic shift number.

And step 5, when the pilot signal sends the data bit 1, namely the pilot channel sends the sequence P, circularly shifting the signal D sent on the data channel by k bits to form a CCSK signal as the data signal, wherein the value of k is selected from the elements in Z. When the pilot signal transmits data bit 0, that is, when the pilot channel transmits sequence-P, the signal D transmitted on the data channel is cyclically shifted by k bits to form a CCSK signal as the data signal, where the value of k is selected from the elements in F.

The invention has the advantages that: compared with the prior art that the cyclic shift times of the data signals are randomly extracted from 0 to N-1 in the navigation/communication integrated design, the method has the advantages that the cyclic shift times of the data signals are selected through the steps, so that the positive/negative autocorrelation peak values of the pilot signals are just overlapped with the positive/negative cross-correlation peak values of the data signals, and the cross-correlation interference of the data channels to the pilot signals is reduced.

Detailed Description

The following describes the embodiments of the present invention in detail with reference to the technical solutions.

A method for improving pilot signal detection performance in navigation/communication integration comprises the following steps:

(1) the length 1023 signal D is correlated with the local signal P. Wherein the length of the pseudo-random sequence is 1023, the signal D is sent by a data channel, the signal P is sent by a pilot channel, and D and P are composed of pseudo-random sequences of different codes of the same family.

(2) The array Q stores the cross-correlation function value after the correlation operation.

(3) Setting a threshold valueWherein α is made to be 2.

(4) And finding out elements which are larger than K in Q, recording the position serial numbers of the elements which correspond to the elements in the array as an array Z, finding out elements which are smaller than-K in Q, and recording the position serial numbers of the elements which correspond to the elements in the array as an array F. Wherein the position sequence number is the corresponding cyclic shift number.

(5) When the pilot signal transmits data bit 1, that is, when the pilot channel transmits sequence P, the signal D transmitted on the data channel is cyclically shifted by k bits to form a CCSK signal as the data signal, where the value of k is selected from elements in Z. When the pilot signal transmits data bit 0, that is, when the pilot channel transmits sequence-P, the signal D transmitted on the data channel is cyclically shifted by k bits to form a CCSK signal as the data signal, where the value of k is selected from the elements in F.

The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.