CN109547129B - Stepping weighting Tong detection method - Google Patents
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- CN109547129B CN109547129B CN201811422468.4A CN201811422468A CN109547129B CN 109547129 B CN109547129 B CN 109547129B CN 201811422468 A CN201811422468 A CN 201811422468A CN 109547129 B CN109547129 B CN 109547129B
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Abstract
The invention discloses a step weighting Tong detection method. The invention can dynamically weight and adjust the step value of the Tong detector by the signal quality (signal-to-noise ratio), gives consideration to the performance and efficiency of the algorithm, and is suitable for complex and changeable scenes. The Tong detector performs self-adaptive adjustment on the step value of the counter according to the size of the signal energy envelope, feeds back the counter to perform accumulation or rollback operation in real time, can flexibly adjust according to scenes or signal states under the condition of not changing the parameters of the Tong detector, does not increase the operation amount, and can optimize the working mode of the detector; under the condition that the contrast of signals and noise is greatly different, the stepping weight is increased, the detection residence time is effectively shortened, and the detection efficiency is improved; aiming at weak signals which are difficult to detect, the stepping weight of the detector can be reduced through weak difference value weighting, the detection confirmation times are increased, the detection performance of the weak signals is improved, and the accuracy and the reliability of signal detection are improved.
Description
Technical Field
The invention belongs to the technical field of communication, relates to a satellite navigation signal synchronous receiving technology, and particularly relates to a rapid high-performance stepping weighting Tong detection method for a navigation signal.
Background
The Navigation receiver is used as an interface device between a Global Navigation Satellite System (GNSS) and a user terminal, and mainly completes functions of user positioning, Navigation and time service. The receiver design is mainly used for realizing signal capture, integrating/clearing each unit in a time domain-frequency domain two-dimensional space, and carrying out judgment detection based on an energy packet to determine whether an expected signal exists and a rough estimation value of a signal parameter (Doppler frequency shift and pseudo-random code phase).
In order to ensure the accuracy and reliability of detection and estimation in the capturing link, a multi-dwell detection algorithm is usually adopted to confirm the capturing result. The Tong detection algorithm is used as a variable retention time detection algorithm, has simple structure, moderate operation and adjustable parameters, and is widely applied to low signal-to-noise ratio signal detection.
However, in a complex scene, the receiver moves with the user, resulting in variable energy fluctuations of the usable navigation signal. Traditional Tong detector parameter is fixed, and in the face of complicated scene signal detection judgement, need face the tradeoff of detection performance and length of time of detection, is difficult to compromise efficiency under the strong signal detection state and the performance under the weak signal detection state, and the flexibility is poor, can not adapt to changeable scene and use.
Disclosure of Invention
In view of this, the present invention provides a step-by-step weighting Tong detection method, which performs step adjustment according to signal quality (signal-to-noise ratio), gives consideration to algorithm performance and efficiency, and is applicable to complex and variable scenes.
The invention provides a step weighting Tong detection method, wherein a Tong detector adjusts the accumulated or retroverted step value of a counter according to the size of signal energy envelope until the counter value is greater than or equal to the counter threshold value or less than zero; if the signal energy envelope is greater than or equal to the set detection threshold, the counter is incremented step by step; and if the signal energy envelope is smaller than the set detection threshold, the counter is stepped back.
Further, the step value of the accumulation is
The step value of the backoff is
Wherein V is a signal energy envelope; vthIs the detection threshold.
Furthermore, the signal energy envelope is I, Q two branch signal energy coherent accumulation values, and if the signal-to-noise ratio of the signal is low (the coherent integration time length is 1ms, and the carrier-to-noise ratio is lower than 30db-Hz), segmented non-coherent energy accumulation can be performed on I, Q two branch signals, so that the signal to-be-determined energy envelope value is improved.
Has the advantages that:
(1) increased flexibility of Tong detector
Once the parameters of the traditional Tong detector are set, the detection mode is determined accordingly, and flexible adjustment according to the actual application scene is difficult. The step weighting Tong detection provided by the invention sets the step weight through signal energy evaluation, can be flexibly adjusted according to scenes or signal states under the condition of not changing the parameters of the Tong detector, does not increase the operation amount, and can optimize the working mode of the detector.
(2) Significantly reducing the average duration of detection dwell
The invention can adjust the stepping weight according to the signal quality, and increase the stepping weight under the condition that the signal and noise contrast is very different (the signal energy is obviously higher or obviously lower than the noise energy), thereby effectively shortening the detection residence time and improving the detection efficiency.
(3) Obviously improving the weak signal detection performance
Aiming at weak signals which are difficult to detect, the invention can reduce the stepping weight of the detector by weighting through weak difference values, increase the detection confirmation times, improve the detection performance of the weak signals and improve the accuracy and the reliability of the signal detection.
Drawings
Fig. 1 is a structural diagram of a step-and-weight Tong detection method.
Fig. 2 is a flowchart of the step-and-weight Tong detection method.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a step weighting Tong detection method, which adaptively adjusts a detector step value in real time according to the signal-to-noise ratio and threshold value difference of a signal to be detected, and optimizes a detection mode to adapt to signal detection judgment under a complex scene.
The schematic structure diagram and the flow chart of the weighted stepping Tong detection method are respectively shown in fig. 1 and fig. 2. The specific description is as follows:
the receiver carries out down-conversion, A/D sampling, de-spreading, demodulation, coherent integration and zero clearing on signals received by an antenna to obtain two paths of signals I/Q, wherein the corresponding expressions are as follows:
wherein a is a signal amplitude; d is navigation message data modulated by the signal; r is a signal pseudo-random code autocorrelation function; tau is the code phase delay difference between the signal and the locally reproduced pseudo-random code; t is the signal coherent integration time length;
is the frequency difference of the signal and the local carrier;
is the phase difference of the signal and the local carrier; n isI、nQRespectively, the mean and variance are independent
White gaussian noise, sinc is the sine function.
And superposing the two branch signals of the formula I/Q, namely: coherent accumulation, obtaining the signal envelope value as the detection statistic of single detection, namely:
V＝I2(n)+Q2(n) (2)
if the signal-to-noise ratio of the signal is low (the coherent integration time length is 1ms, and the carrier-to-noise ratio is lower than 30db-Hz), non-coherent integration can be carried out on the signals of the two branches I/Q, and the energy envelope with higher signal-to-noise ratio gain is obtained to be used as the detection statistic of single detection, namely:
wherein N isncohIs the total number of non-coherent integrations.
And 2, configuring a single detection threshold and a Tong detection parameter according to conditions such as user detection performance requirements, signal quality (signal-to-noise ratio), application scenes and the like.
The Tong detector is used as a detection confirmation algorithm with variable residence times, and a user can acquire a more ideal system detection probability and an average residence time by setting a counter threshold maximum value A and a counter threshold initial value B according to a signal to noise ratio, factors (detection probability, detection time length and the like) considered by emphasis and the like. Then, based on the user detection performance requirement (tolerance of system false alarm probability), a decision threshold of single detection is set according to the detection model.
In general, the larger upper limit value a and the larger initial value B of the counter enable the Tong detector to obtain better system detection probability, but also increase the average retention times of the detection units and prolong the detector residence time. In particular, the adjustment of the initial value B is more obvious for the change of the detection probability and the average residence time of the Tong detector under different signal-to-noise ratio detections.
Step 3, comparing the signal energy envelope with a Tong detection threshold, and performing accumulation or rollback operation on a counter of the detector;
in the traditional method, the Tong detector parameter is fixed, and the invention uses the signal energy envelope V and the Tong detector detection threshold VthComparing, and performing step accumulation or step rollback operation on the counter according to the comparison result,
A) if the signal energy envelope V is more than or equal to VthThen the counter is incremented by steps:
K＝K+step (4)
wherein the accumulated step value is set as:
B) if the signal energy envelope V<VthThen the counter steps back:
K＝K-step (6)
wherein, the backspacing value is set as:
and 4, carrying out detection judgment on the signal according to the state of the Tong detector counter.
And (4) repeatedly executing the step (3) in the same detection unit, and carrying out detection confirmation on the unit signal for multiple times until the counter value K is more than or equal to A or K is less than 0.
If the counter value K is larger than or equal to A, the method comprises the following steps: if the counter value is increased from the initial value B to a value larger than the upper limit value of the counter, judging that a signal is detected, estimating signal parameters (pseudo code delay and frequency) according to the pseudo code phase and the carrier frequency point reproduced locally by the receiver at the moment, and entering a tracking link;
if the counter value K <0, i.e.: if the counter value is reduced to a value less than zero from the initial value B, judging that the detection cell signal does not exist, and resetting the counter value to B; the Tong detector moves to the next detection cell to make detection decision until a signal is detected or all cells are detected.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A step weighting Tong detection method is characterized in that a Tong detector adjusts an accumulated or retroverted step value of a counter according to the size of a signal energy envelope until the counter value is greater than or equal to a counter threshold value or is smaller than zero; if the signal energy envelope is greater than or equal to the set detection threshold, the counter is incremented step by step; if the signal energy envelope is smaller than the set detection threshold, the counter steps back;
wherein the accumulated step value is
The step value of the backoff is
Wherein V is a signal energy envelope; vthIs the detection threshold.
2. The step-and-weight Tong detection method of claim 1, wherein the signal energy envelope is I, Q two branch signal energy coherent accumulation values; if the signal-to-noise ratio is low, I, Q is the non-coherent energy accumulation value for the two branch signals.
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| CN105577230A (en) * | 2015-12-22 | 2016-05-11 | 北京理工大学 | Tong detection decision method for improving convergence function |
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| EP0501829A1 (en) * | 1991-02-28 | 1992-09-02 | Texas Instruments Incorporated | System and method for a digital navigation satellite receiver |
| CN101005293A (en) * | 2006-12-31 | 2007-07-25 | 浙江大学 | Signal quick catching method and device for high dynamic satellte navigation receiver |
| CN101082664A (en) * | 2007-07-03 | 2007-12-05 | 浙江大学 | Devices and methods for fast catching signal in high dynamic satellite navigation receiving machine |
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