The invention is applicable to the field of navigation, and provides a satellite signal bit synchronization method, a satellite signal bit synchronization device and a navigation receiver. The satellite signal bit synchronization method comprises the steps of: assuming N kinds of situations according to bit periods of a GPS system and a Beidou satellite navigation system, wherein N is equal to the number of milliseconds of one bit period, and each situation corresponds to one situation that I branch data and Q branch data read in one millisecond within one bit period serve as I branch data and Q branch data of a first millisecond of 1 piece of bit data separately; performing FFT operation on N groups of sequences corresponding to the N kinds of situations to obtain N groups of corresponding results; and comparing the N groups of results to obtain the maximum value, and regarding a position of the first millisecond of the result group corresponding to the maximum value as an initial position of the bit period, so as to realize satellite signal bit synchronization. The satellite signal bit synchronization method provided by the invention can be compatible with the Beidou satellite navigation system and the GPS system, and realizes satellite signal bit synchronization.

Satellite signal bit synchronization method and device, and navigation receiver

The present invention relates to a slope bit synchronization method for satellite navigation signals. The method comprises the steps of acquiring a GPS signal; tracking the GPS signal and demodulating to obtain navigation message data; calculating the energy of each point in the navigation message data to realize the module acquirement; gradually accumulating the energy value of each position; conducting the straight-line fitting for 5 points before a position and 5 points after the position through the curve fitting process; and figuring out the intersection point of the two straight lines, wherein the intersection point is the bit of the bit synchronization. In this way, the curve fitting is conducted to figure out the slope so as to realize the bit synchronization. Meanwhile, the bit synchronization can be realized by using the slope for not only strong signals but also weak signals. Moreover, the synchronization correct probability of the above slope-based method is higher than that of the histogram-based method. For weaker signals, the bit synchronization can also be realized by using the slope.

Slope bit synchronization method for satellite navigation signals

The invention provides a method and device for realizing bit synchronization. The method comprises: selecting any twenty adjacent data from a data flow of a shift-in shifting register as segmented data for a bit synchronization analysis; carrying out correlation operation on the twenty data among the divided segmented data; carrying out absolute value or square processing on the correlation operation results, carrying out accumulation of correlation operation results after absolute value or square processing at a same candidate position to obtain a signal-to-noise-ratio gain corresponding to each candidate position; and calculating a difference between a maximum signal-to-noise-ratio gain value and a second largest signal-to-noise-ratio gain value that correspond to each candidate position, comparing the difference value obtained by calculation with a preset threshold value, and carrying out bit synchronization determination processing. With the method provided by the invention, correlation operation is carried out on divided segment data and bit synchronization processing is carried out after obtaining the signal-to-noise-ratio gain values, so that the bit synchronization time is reduced and the work efficiency of bit synchronization is improved.

Method and device for realizing bit synchronization

The invention discloses a method for determining a user range finding precision upper bound value (URA_UB) in a multi-station broadcast ephemeris, and relates to the monitoring and assessment of satellite navigation system performance A frequency weighting pattern is used to identify and determine the expression form of single station user range finding precision (URA), and then determine the user range finding precision upper bound value (URA_UB) of the corresponding satellite at the corresponding time based on the user range finding precision (URA) values in multiple station broadcast ephemeris The user range finding precision upper bound value synthesized in the invention can be used for integrity monitoring and assessment of global satellite navigation system space signals, and can be used as a scientific reference basis for lifting satellite navigation system performance

Method for determining user range finding precision upper bound value in multi-station broadcast ephemeris

The invention discloses a method for rejecting abnormal satellites in satellite navigation positioning. Before starting of positioning iteration, rejection is performed multiple times by combining real application scenes according to resolving information; and the influence on a final positioning result by abnormal satellites and abnormal measurement values can be reduced to be in a receivable range by using an extremely low calculation amount. During the positioning iteration process, the balance of positioning precision and accuracy is sought by utilizing the satellite distribution and pseudo-range residual error information fully. The method has advantages of low calculation load, low logic complexity and stable and reliable result.

Method for rejecting abnormal satellites in satellite navigation positioning

The invention provides a rapid GPS bit synchronization method. According to the method, frequency mixing is performed on an input signal and a local same-frequency carrier signal, then coherent integration is performed on a signal obtained after carrier waves are removed and a local pseudo-random code, the dot product difference between a k-1 integral value and a kth integral value is calculated, and the specific nature of the dot product difference output result is used for judging the turning point of a data bit, bit synchronization is achieved, and finally, according to a histogram statistic result of data jump points within statistic time, a bit synchronization point is determined. The positioning waiting time can be shortened, the judgment probability of the bit synchronization point can be increased, and the algorithm is mature, stable and easy to implement.

Rapid GPS bit synchronization method

The invention provides a satellite navigation pseudorange abnormality real time detection method. The method includes: utilizing characteristics of high-frequency output and short-time high accuracy of an inertial navigation system; taking a reasonable range to which pseudorange of a satellite navigation system belongs; establishing detection standard information used for directly detecting satellite navigation pseudorange abnormality in real time without introducing filtering parameters of a combined navigation system; detecting pseudorange abnormality of the satellite navigation system in real time. The method is simple, easy to implement, high in instantaneity, satellite navigation pseudorange abnormality information can be effectively eliminated, and reliability of the satellite combined navigation system is improved.

Satellite navigation pseudorange abnormality realtime detection method

The invention provides a shifting register realized by using a random access memory (RAM) unit. The shifting register comprises a single-port RAM and an add 1 accumulator, wherein an externally input periodic clock signal is connected with a clock input end of the add 1 accumulator and a clock input end of the single-port RAM; the add 1 accumulator is used for outputting an address signal into the single-port RAM; the single-port RAM is driven to write the data of a data signal into the address corresponding to the single-port RAM according to the address of the input address signal under the driving of the periodic clock signal; the data in the single-port RAM, corresponding to the address of the address signal, is output. The cost of the shifting register is much lower than that of a register under the condition of the same memory capacity.

Shifting register realized by using random access memory (RAM) unit

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Rapid GPS bit synchronization method

Satellite navigation pseudorange abnormality realtime detection method

Shifting register realized by using random access memory (RAM) unit