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High-dynamic carrier phase tracking method for echoes of pseudo code modulated continuous wave radar

A technology for modulating continuous wave and radar echo, which is applied in the direction of radio wave measurement systems and instruments, which can solve the problems of carrier phase tracking performance degradation, inability to solve high dynamic carrier phase precision tracking, large transient error, etc., and achieve good tracking Accuracy, good dynamic tracking ability, avoiding the effect of discontinuous filtering value

Active Publication Date: 2018-09-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This method improves the dynamic tracking ability and carrier phase tracking accuracy to a certain extent, but on the one hand, large transient errors are generated due to the frequent switching between the frequency-locked loop and the phase-locked loop. This loop structure will work in a single frequency-locked loop state for a long time in the scene where dynamic stress persists, resulting in a decrease in carrier phase tracking performance
[0003] It can be seen that the existing methods cannot solve the precise tracking of carrier phase under high dynamic and low signal-to-noise ratio

Method used

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  • High-dynamic carrier phase tracking method for echoes of pseudo code modulated continuous wave radar
  • High-dynamic carrier phase tracking method for echoes of pseudo code modulated continuous wave radar
  • High-dynamic carrier phase tracking method for echoes of pseudo code modulated continuous wave radar

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Embodiment 1

[0030] The pseudo code modulation continuous wave radar echo high dynamic carrier phase tracking method provided by the present invention adopts a frequency-locked loop in parallel with a phase-locked loop, such as figure 1 As shown, the frequency locked loop is used to track the carrier frequency of the echo digital intermediate frequency signal of the pseudo code modulated continuous wave radar, and the phase locked loop is used to perform carrier phase tracking of the echo digital intermediate frequency signal of the pseudo code modulated continuous wave radar;

[0031] The frequency-locked loop performs the following steps:

[0032] 1) Obtain the predicted Doppler frequency, perform digital quadrature down-conversion processing and integral clearing processing on the echo digital intermediate frequency signal of the pseudo-code modulated continuous wave radar, and obtain the frequency-locked loop integral clearing result;

[0033] I(k)≈A·R[Δτ(k)]·sinc[Δω d (k)·N / 2]cosθ k...

Embodiment 2

[0082] In this embodiment, consider that the pseudo-code modulation continuous wave radar echo IF carrier frequency is 16.384MHz, the pseudo-code rate is 8Mbps, the pseudo-code period is 8191, and the sampling frequency f s =1 / T s =65.536MHz, carrier-to-noise ratio C / N 0 = 38dBHz. Echo Doppler frequency is 10.25kHz, Doppler frequency prediction error Δf d =250Hz, the first derivative of Doppler frequency to time caused by acceleration stress f (1) =500Hz / s, the second derivative of Doppler frequency to time caused by jerk stress f (2) =9.8Hz / s 2 .

[0083] 1) The frequency-locked loop uses the predicted Doppler frequency to perform digital quadrature down-conversion and integral clearing on the digital intermediate frequency signal of the pseudo-code modulated continuous wave radar echo. The integral clearing period is T=N T s =1ms, get the integration clearing result:

[0084] I(k)≈A·R[Δτ(k)]·sinc[Δω d (k)·N / 2]cosθ k ,k=1,2,...,(11)

[0085] Q(k)≈A·R[Δτ(k)]·sinc[Δω ...

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Abstract

The invention discloses a high-dynamic carrier phase tracking method for echoes of a pseudo code modulated continuous wave radar. According to the principle of the method, a frequency locking ring isconnected with a phase locking ring in parallel and is used for tracking the carrier frequency in digital intermediate frequency signals of the echoes of the pseudo code modulated continuous wave radar, so as to eliminate high-order dynamic components in high-dynamic carrier signals; and the frequency locking ring is subjected to locking determination, the phase locking ring is subjected to locking determination by virtue of a locking determination result of the frequency locking ring when the frequency locking ring is locked and then can work at a relatively low dynamic state, so as to realize the high-precision tracking of the carrier phase in the digital intermediate frequency signals of the echoes of the pseudo code modulated continuous wave radar. According to the method, the good dynamic tracking capability of the frequency locking ring and the high carrier phase tracking precision of the phase locking ring are adequately exerted, and the precise tracking problem of high-dynamicand non-steady carrier signals under a serious non-steady state of a detection signal caused by high-maneuvering attitude adjustment and orbit changing of a carrier can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of microwave radar measurement, in particular to a high dynamic carrier phase tracking method for pseudo code modulated continuous wave radar echo. Background technique [0002] In a highly dynamic environment, due to the time-varying nature of the Doppler frequency shift, using a phase-locked loop to track the carrier phase has a high phase tracking accuracy, but the phase-locked loop has a weak dynamic tracking performance; the frequency-locked loop has a relatively high Good Doppler frequency dynamic tracking performance, but weak phase tracking performance. In order to solve this contradiction, Deng Xiaodong and Sun Wu proposed a frequency-locked loop and The carrier signal tracking loop combined with a phase-locked loop first tracks the carrier frequency through the frequency-locked loop. When the filter output of the frequency-locked loop is less than a certain threshold, it switches to the phase-lock...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 崔嵬王烽宇吴嗣亮向锦志沈清
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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