A Fast Bit Synchronization Method for Global Positioning System Receiver
A global positioning system and bit synchronization technology, applied in positioning, radio wave measurement system, radio wave beacon system, etc., can solve the problems of low signal-to-noise ratio signal performance, high time-consuming, long estimation time, etc. Achieve the effect of small bit synchronization error probability, reduce bit synchronization time, and speed up bit synchronization speed
Active Publication Date: 2012-02-08
北京中科微知识产权服务有限公司
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Problems solved by technology
The histogram method has a simple structure and a small amount of calculation, but it has poor performance for low signal-to-noise ratio signals and takes a long time to estimate
The maximum likelihood estimation method has a larger amount of calculation than the histogram method, but the error estimation probability for low signal-to-noise ratio is greatly reduced compared with the histogram method.
The traditional maximum likelihood method uses a fixed number of non-coherent accumulation to improve the signal-to-noise ratio, but this method is time-consuming. A typical estimation time is 4s, which has strict requirements on the time to first fix (Time To First Fix / TTFF) of modern receivers is almost intolerable
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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0033] The GPS baseband chip is the chip that processes the baseband signal in the GPS receiver, and is the core of the entire GPS receiver. Various methods of the present invention are all implemented in the GPS baseband chip. For convenience, "receiver" in the present invention refers to "GPS baseband chip".
[0034] figure 1 Describes a schematic diagram of a typical GPS receiver to achieve positioning resolution. Knowing the position 101 of four satellites and the pseudo-range 102 between these four satellites and the receiver, the error value of the position 103 of the receiver and the receiver time relative to the satellite time can be calculated by the so-called "pseudo-range observation equation" , completed th...
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The invention discloses a fast bit synchronization method for a global positioning system receiver. The method comprises: calculating the bit energy corresponding to each bit phase, and performing non-coherent accumulation on the calculated bit energy; Find the maximum value and the second maximum value of the bit energy in the bit energy, calculate the difference between the maximum value and the second maximum value, and obtain the difference between the maximum value and the second maximum value of the bit energy; compare the difference with the preset bit energy threshold If the difference is less than the bit energy threshold, a new round of bit energy calculation and non-coherent accumulation will be performed; if the difference is greater than or equal to the bit energy threshold, the non-coherent accumulation will be terminated, and the bit energy will be judged to The bit phase corresponding to the maximum value of the bit energy is used as a bit flip boundary; the millisecond counter is adjusted based on the bit flip boundary. The present invention can effectively shorten the bit synchronization estimation time on the premise of ensuring that the probability of misestimation is low enough.
Description
technical field [0001] The invention relates to the technical field of global satellite positioning and navigation, such as the GPS system, in particular to a fast bit synchronization method for a global positioning system receiver. Background technique [0002] Global satellite positioning and navigation systems, such as the Global Positioning System (GPS), include a constellation of satellites (also known as Navstar satellites) that transmit GPS signals that can be used by a receiver to determine the receiver's location. Satellite orbits are arranged in multiple planes so that the signal can be received from at least four satellites at any location on Earth. More typically, the signal is received from more than six satellites in most places on Earth. [0003] The GPS signal transmitted by each GPS satellite is a direct sequence spread spectrum signal. The commercially used signal is associated with the Standard Positioning Service (SPS) and is a direct-sequence biphase s...
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IPC IPC(8): G01S5/02G01S1/02
Inventor郑睿陈杰
Owner北京中科微知识产权服务有限公司