A capture circuit and method compatible with continuous and pulsed navigation signals
A navigation signal and circuit technology, applied in the field of communication, can solve the problem of incompatibility in capturing pulse navigation signals and continuous navigation signals, and achieve the effect of extended functions
Active Publication Date: 2017-10-27
CHENGDU GUOXING COMM
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[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a capture circuit and method compatible with continuous and pulse navigation signals, and solve the problem that traditional navigation signal capture circuits cannot be compatible with capture pulse navigation signals and continuous navigation signals without increasing circuit resources. nav signal problem
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[0016] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings: figure 2 As shown, a method for capturing continuous and pulsed navigation signals is compatible, which includes a continuous navigation signal processing step and a pulsed navigation signal processing step. The continuous navigation signal capturing step includes the following sub-steps:
[0017] Such as figure 2 As shown, a capture circuit compatible with continuous and pulse navigation signals includes a code NCO, a phase control circuit, a PN code generator, a threshold comparison and result output circuit, and a related processing circuit. The related processing circuit consists of multiple groups of parallel It consists of shift register, correlator, FFT circuit, multiple switch MUX and detection circuit. The output of the code NCO is connected to the phase control circuit, and the phase control circuit is connected to the PN code g...
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The invention discloses a capture circuit and method compatible with continuous and pulsed navigation signals, which includes a continuous navigation signal processing step and a pulsed navigation signal processing step, and the pulsed navigation signal processing step includes the following sub-steps: (1) the following The frequency conversion satellite signal and the local PN code signal are sent to the correlator at the same time for integration and correlation of a specific time length; (2) The correlation value output by the correlator is directly sent to the detection module for detection processing; (3) The upper The result calculated in the first step is sent to the threshold comparison circuit, the peak value is searched, the threshold is judged, and the result is output. The invention solves the problem that the traditional navigation signal capture circuit cannot realize the capture of pulse navigation. The baseband processing of this circuit can be compatible with the capture of traditional continuous navigation signals without increasing circuit resources, and can be used for fixed time slots or pulse navigation. The navigation signal of the time slot is captured, which expands the function of signal capture in the baseband processing.
Description
Technical field [0001] The invention belongs to the field of communication technology, and particularly relates to a capture circuit and method compatible with continuous and pulse navigation signals. Background technique [0002] The acquisition of satellite navigation signals is the key signal processing process of satellite navigation receivers. At present, the main navigation signals (GPS\GLONASS\COMPASS) adopt continuous signals to realize a typical signal acquisition circuit such as figure 1 As shown, the digital intermediate frequency signal is down-converted and sent to the correlator at the same time as the local PN code signal. The correlation value output by the correlator is sent to the frequency domain FFT and detection module for frequency domain FFT and detection processing, and finally the threshold comparison circuit After threshold judgment is made on the capture result, the result is output. The circuit can perform two-dimensional search in both frequency domai...
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IPC IPC(8): G01S19/24
Inventor 白松
Owner CHENGDU GUOXING COMM