Method and device for assisting code loop by utilizing carrier loop of satellite receiver

A satellite receiver and carrier loop technology, applied in the field of satellite navigation signal processing, can solve problems such as deviation, low precision, and inaccurate reflection of the Doppler effect, and achieve the goals of improving precision, avoiding calculation errors, and accurately positioning and measuring speed Effect

Inactive Publication Date: 2010-02-17
华力智芯(成都)集成电路有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for precise location and velocity measurements with no need for complicated calculations or carrier smoothening techniques like adding extra bits during signal processing. By utilizing this method instead of dividing it into smaller parts, there are fewer errors compared to traditional methods.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency and quality of detectors used in communication systems such as navigational satellites or space vehicles. Current methods require complex hardware circuits which result in increased delays when processing data collected through these devices.

Method used

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  • Method and device for assisting code loop by utilizing carrier loop of satellite receiver
  • Method and device for assisting code loop by utilizing carrier loop of satellite receiver
  • Method and device for assisting code loop by utilizing carrier loop of satellite receiver

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Embodiment 1

[0026] The processing flow of the method for using the carrier loop to assist the code loop in the satellite receiver provided by the embodiment of the present invention is as follows figure 2 shown, including the following steps:

[0027] Step 21: Multiply the carrier frequency word A by the local clock B of the satellite receiver to obtain the frequency word C.

[0028] When the carrier loop of the satellite receiver tracks the satellite signal, the frequency word A of the carrier can be obtained from the carrier loop. Then, the frequency word C is obtained by multiplying the carrier frequency word A by the local clock B of the satellite receiver.

[0029] The above-mentioned process of calculating the frequency word C is repeated in each cycle of the local clock, therefore, multiple frequency words C can be obtained in each cycle of the local clock.

[0030] Step 22: Divide the local oscillator frequency word of the down-conversion module by the pseudo-code frequency to ...

Embodiment 2

[0045] The loop of the code loop in the embodiment of the present invention uses a first-order loop, and the structural diagram of the first-order loop is as follows image 3 As shown, as time goes by, the closing time gradually increases, and the loop bandwidth gradually decreases until the 10E-4Hz bandwidth is reached. The specific process is as follows:

[0046] Such as image 3 As shown, the position of the loop filter is a proportional factor K, and the bandwidth is adjusted by adjusting the size of K. The larger the K, the wider the bandwidth, and the smaller the K, the narrower the bandwidth. After the loop is closed, as time increases, Adjust the size of K through the program. When the loop is just closed, the bandwidth is set to 1Hz, 1 / 10Hz after 2 seconds, 1 / 100Hz after 4 seconds, 1 / 1000Hz after 6 seconds, and 1 / 1000Hz after 8 seconds. 1 / 10000Hz. So far the loop reaches the final bandwidth of 10E-4Hz.

[0047]In this embodiment, the bandwidth of the code loop its...

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Abstract

The invention discloses a method and a device for assisting a code loop by utilizing a carrier loop of a satellite receiver. The method mainly comprises the following steps: multiplying a carrier frequency word of the carrier loop of the satellite receiver by a local lock of the satellite receiver to obtain a first frequency word, and obtaining a stepped-frequency word according to the first frequency word, a local frequency word of the satellite receiver and a pseudocode frequency in the static case; accumulating a plurality of the stepped-frequency words obtained in each period of the localclock, obtaining an accumulated value, and comparing the accumulated value with the size of a predetermined constant to output a carry signal; and calculating the frequency word of the loop of the code loop of the satellite receiver according to the carry signal. When the invention is utilized, hardware of an adder, a subtractor, and the like can be used for realizing assistance of the carrier loop to the code loop, calculation error of the frequency word of the loop of the code loop, which is brought by division operation, is avoided, and the precision of the frequency word of the loop of thecode loop and an observation value can be obviously enhanced.

Description

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Claims

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Application Information

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Owner 华力智芯(成都)集成电路有限公司
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