Distance measuring method using frequency hopping pattern to solve fuzzy distance

Abstract

The invention discloses a distance measuring method using a frequency hopping pattern to solve a fuzzy distance, aiming at providing a method for solving maximum fuzzy distance not depending on a period code of a pseudo code, and accurately measuring the distance. The distance measuring method is achieved by the following technical scheme that: in the distance measuring of a direct spread frequency hopping hybrid spread spectrum system (DS / FH), the measured distance comprises such two parts as a distance RDS corresponding to a direct spread (DS) period of PN sequence and a distance RNDS corresponding to an integral multiple direct spread (DS) period of PN sequence. A code period counter which is connected with a summitor by a latch is added, wherein the code period counter extracts the distance RNDS. Overall ''1'' pulse which is synchronous with an initial phase is generated when the pseudo code of the frequency hopping (FH) pattern is generated, and the fuzzy distance is solved by clearing the code period via overall ''1'' pulse of the initial phase of the frequency hopping pattern. The distance measuring method uses the period of PN sequence to solve the fuzzy distance in a partsmaller than the distance corresponding to the period of PN sequence, and uses the frequency hopping (FH) pattern to dissolve the fuzzy distance in a part bigger than the distance corresponding to the period of PN sequence, thus, the problem that distance solved in the distance measuring within a distance bigger than the distance corresponding to the DS code period in the DS / FH system is solved.

Description

technical field [0001] The invention relates to a direct spread frequency hopping hybrid spread spectrum system mainly applied under the condition that distance measurement is required and the maximum value of the distance is greater than the distance corresponding to the period of the direct spread pseudo-code code. Background technique [0002] In the application system that needs distance measurement, the direct spread frequency hopping hybrid spread spectrum system uses the code clock of the direct spread pseudo-code for distance measurement. Since the code period of the DS pseudo-code is generally relatively short, the corresponding distance is also relatively small. Under the condition that the distance to be measured is greater than the corresponding distance of the DS pseudo-code code period, if the code period of the DS pseudo-code is used to measure the distance If the distance is defuzzified, the distance with ambiguity cannot be measured during ranging, making th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of deficiencies that can correctly measure distance for prior art, and solution distance ambiguity does not depend on the method that increases direct spread pseudo-code cycle length, to solve frequency hopping in direct spread (DS / In the FH) system, the existing short direct-spread pseudo-code period cannot correctly solve the problem of distance ambiguity

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