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Segmented type P code capturing method and P code capturing device

A segmented, P-code technology, applied in the field of satellite navigation and positioning, can solve problems such as slow search speed, and achieve the effect of solving large errors, accurate, simple and effective acquisition strategies

Active Publication Date: 2016-01-13
CHENGDUSCEON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method implements frequency parallel search by performing FFT on the correlated results, and the search speed is relatively slow.

Method used

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  • Segmented type P code capturing method and P code capturing device
  • Segmented type P code capturing method and P code capturing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 , figure 2 As shown, a segmented P code capture device includes an uncertainty interval segmentation module, a satellite number acquisition module, a capture P code time calculation module, a capture device setting module, and a capture peak threshold judgment module connected in sequence. The specific operation steps of the present invention are as follows:

[0037] Step 1: Through the uncertainty interval division module, divide the P code uncertainty time into N uncertainty interval sections, and set the satellite capture parameters through the capture device setting module;

[0038] Step 2: Obtain the current acquisition satellite number m, the current uncertainty interval index number n, and the current acquisition channel index number i through the satellite number acquisition module;

[0039] Step 3: Through the acquisition P code time calculation module, calculate the signal transmission time of the current acquisition satellite, and put the transmis...

Embodiment 2

[0044] Such as figure 1 , figure 2 As shown, this embodiment further optimizes the foregoing embodiment 1, and the details are as follows:

[0045] The time value of the uncertainty interval in the above step 1 is t=T / (N*T1), where: T is the total P code uncertainty time, N is the number of segments of the P code captured by the capture device each time, and T1 is the capture The time required for the device to capture each P code. Set the satellite capture parameters, including setting the system type, intermediate frequency and chip number of the currently captured satellite. This simple equalization of the P code uncertainty time enables the capture device to be fully utilized and ensures the accuracy of the P code capture.

[0046] The specific process of the above step two is to first determine whether it is the first acquisition. If it is the first acquisition, start the acquisition from the uncertainty interval of No. 1, and obtain the current acquisition satellite number...

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Abstract

The invention discloses a segmented type P code capturing method, which comprises the steps of segmenting P code uncertainty time, acquiring a current captured satellite number m and a current captured channel index number I, calculating a signal transmitting moment of a current captured satellite, setting capture parameters and starting a capturer, reading a capture peak value returned by the capturer and judging whether the capture is success. Through segmenting the P code uncertainty time, respectively calculating the signal transmitting moments of satellites, carrying out correlation operation through the capturer and capturing P code signals, the segmented type P code capturing method effectively solve the problems that the PRM placement time error is large, the capture is difficult and large amounts of correlator resources are occupied during P code capture. The invention further discloses a segmented type P code capturing device, which comprises an uncertainty interval segmentation module, a satellite number acquisition module, a captured P code time calculation module, a capturer setting module and a capture peak value threshold judgment module which are connected in sequence, and is an accurate, simple and effective capturing device designed for a satellite receiver.

Description

Technical field [0001] The invention relates to the technical field of satellite navigation and positioning, in particular to a segmented P code acquisition method and a P code acquisition device. Background technique [0002] In the field of satellite navigation and positioning technology, the acquisition of the P code is generally based on the C / A code, and the P code signal is captured according to the information provided by the C / A code. The P code is a pseudo-random code with a long period and a high rate. It is difficult to capture directly, requiring a long capture time and a huge amount of calculation. [0003] At present, there are many methods for direct capture of P codes at home and abroad, which can be roughly divided into two categories. One is the time-domain processing method based on massively parallel correlators. However, this type of method has higher power consumption and higher hardware cost. High; the other is a variety of frequency domain processing method...

Claims

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Application Information

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IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 王功文高丽娟刘静洁华伟
Owner CHENGDUSCEON TECH
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